FLUID CONTROL ASSEMBLIES, AND CORE BARREL AND OVERSHOT ASSEMBLIES COMPRISING SAME

Abstract

Fluid control assemblies including at least one ring. The fluid control assemblies are used within core barrel assemblies to: provide an indication that a core barrel assembly has reached a drilling position and is latched to a drill string; serve as a mechanical shut-off valve that restricts the flow of drilling fluid within a core barrel assembly; and/or serve as a grease seal at the connection between an inner tube cap and an inner tube that receives a core sample.

Description

CROSS-REFERENCE TO RELATED PATENT APPLICATION

This application claims priority to and the benefit of the filing date of U.S. Provisional Patent Application No. 62/110,007, filed Jan. 30, 2015, which is incorporated herein by reference in its entirety.

FIELD

This invention relates generally to drilling devices and methods that may be used to drill geological and/or manmade formations. In particular, the invention relates to fluid control assemblies used during drilling operations and core barrel assemblies and overshot assemblies incorporating such fluid control assemblies.

BACKGROUND

It is known to use mechanical bushings and rings within conventional drilling systems to serve many important functions, including: providing an indication that a core barrel assembly has reached a drilling position and is latched to a drill string; serving as a mechanical shut-off valve that restricts the flow of drilling fluid within a core barrel assembly; and serving as a grease seal at the connection between an inner tube cap and an inner tube that receives a core sample. Conventional nylon bushings are dimensionally sensitive to humidity and are difficult to machine with the specific dimensions that are required for use in drilling applications. In particular, it is difficult to machine conventional nylon bushings with the slight interference fit required to produce a consistent fluid pressure signal. Additionally, conventional nylon bushings are subject to significant wear in drilling applications. Conventional polyurethane compression rings are subject to increased deformation with continued use, and they exhibit significant wear during tripping. In combination, these limitations of polyurethane compression rings result in inconsistent performance and/or decreased productivity during drilling operations.

Thus, there is a need in the pertinent art for fluid control assemblies that provide the above-referenced functions during drilling operations without the deficiencies associated with conventional bushings and compression rings. In particular, there is a need for fluid control assemblies within core barrel assemblies that are not dimensionally sensitive to humidity, can be easily machined to specific dimensions, are not subject to significant wear in drilling applications, and have consistent deformation with continued use.

SUMMARY

Described herein, in one aspect, is a fluid control assembly having a longitudinal axis and including at least one spiral ring and a bushing. Each spiral ring can have inner surfaces that cooperate to define an inner diameter of the spiral ring and outer surfaces that cooperate to define an outer diameter of the spiral ring. Each spiral ring can be configured for axial and radial compression and expansion relative to the longitudinal axis. The bushing can have an inner surface that defines an inlet, an outlet, a central bore extending between the inlet and the outlet, and at least one slot positioned in communication with the central bore at a location between the inlet and the outlet. At least one slot of the bushing can be configured to receive the at least one spiral ring, and the at least one slot can be configured to retain the at least one spiral ring during axial and radial compression and expansion of the at least one spiral ring.

Also described herein is a fluid control assembly having a longitudinal axis and including at least one spiral ring and at least one tapered ring. Each spiral ring can have inner surfaces that cooperate to define an inner diameter of the spiral ring and outer surfaces that cooperate to define an outer diameter of the spiral ring. Each spiral ring can be configured for axial and radial compression and expansion relative to the longitudinal axis. Each tapered ring can have a first end, an opposed second end, an inner surface, and an outer surface. The inner surface of each tapered ring can define a central bore extending from the first end to the second end of the tapered ring. The outer surface of each tapered ring can be outwardly tapered relative to the longitudinal axis of the fluid control assembly moving from the first end to the second end of the tapered ring. The first end of each tapered ring can have a first outer diameter that is less than the inner diameter of each spiral ring. Each spiral ring can be configured to circumferentially surround at least the first end of a respective tapered ring. Movement of the at least one tapered ring relative to the longitudinal axis of the fluid control assembly can be configured to effect radial compression and expansion of the at least one spiral ring relative to the longitudinal axis of the fluid control assembly.

Core barrel assemblies comprising the disclosed fluid control assemblies are also described. Additionally, methods of controlling fluid flow using the disclosed fluid control assemblies are described.

Further described is a core barrel assembly having a longitudinal axis and including an upper latch body, a lower latch body, a core sample tube, and a fluid control assembly. The lower latch body can cooperate with the upper latch body to define an inner channel. The lower latch body can include a core sample tube cap and a valve body that has an outer surface, with the valve body being operatively received within the core sample tube cap. The core sample tube can be operatively coupled to the core sample tube cap of the lower latch body. The fluid control assembly can include at least one spiral ring. Each spiral ring can have inner surfaces that cooperate to define an inner diameter of the spiral ring and outer surfaces that cooperate to define an outer diameter of the spiral ring. Each spiral ring can be configured for axial and radial compression and expansion relative to the longitudinal axis. The inner surfaces of the at least one spiral ring of the fluid control assembly can be positioned in circumferential engagement with the outer surface of the core sample tube cap of the lower latch body. The fluid control assembly can be configured to permit relative axial movement of the lower core barrel subassembly and the core sample tube. Methods of using the core barrel assembly are also described.

Additional advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

DETAILED DESCRIPTION OF THE FIGURES

These and other features of the preferred embodiments of the invention will become more apparent in the detailed description in which reference is made to the appended drawings wherein:

FIG. 1A is a perspective view of an exemplary spiral ring as disclosed herein. FIG. 1B is a side view of the spiral ring of FIG. 1A, showing a crossover portion of the spiral ring. FIG. 1C is a side view of the spiral ring of FIG. 1A, showing the side of the spiral ring opposite the crossover portion.

FIG. 2A is a perspective view of an exemplary bushing as disclosed herein. FIG. 2B is a front view of the bushing of FIG. 2A, showing an inlet of the bushing.

FIG. 3 is a partially transparent perspective view of an exemplary fluid control assembly having a bushing and at least one spiral ring as disclosed herein.

FIG. 4A depicts a cross-sectional view of an exemplary core barrel assembly having a fluid control assembly for providing a pressure change indication as disclosed herein. FIG. 4B depicts a close-up view of the latch assembly, the fluid ports, the valve member, the fluid control assembly, and the lower latch body of the core barrel assembly of FIG. 4A. FIG. 4C depicts a close-up view of the valve member and the fluid control assembly of FIG. 4A.

FIG. 5A depicts a cross-sectional view of an exemplary overshot assembly having a fluid control assembly for providing a pressure change indication as disclosed herein. FIG. 5B depicts a close-up view of the upper overshot body, the seals, the seal seat, the valve member, the fluid control assembly, and the overshot head of the overshot assembly of FIG. 5A. FIG. 5C depicts a close-up view of the valve member and the fluid control assembly of FIG. 5A.

FIG. 6A depicts a cross-sectional view of a core barrel assembly, showing a first exemplary configuration of a fluid control assembly for serving as a mechanical shut-off valve as disclosed herein. FIG. 6B is a close-up view of the fluid control assembly of FIG. 6A.

FIG. 7A depicts a cross-sectional view of a core barrel assembly, showing a second exemplary configuration of a fluid control assembly for serving as a mechanical shut-off valve as disclosed herein. FIG. 7B is a close-up view of the fluid control assembly of FIG. 7A.

FIG. 8A depicts a cross-sectional view of a core barrel assembly, showing a third exemplary configuration of a fluid control assembly for serving as a mechanical shut-off valve as disclosed herein. FIG. 8B is a close-up view of the fluid control assembly of FIG. 8A.

FIG. 9A illustrates a cross-sectional view of a core barrel assembly having a fluid control assembly for serving as a grease seal as disclosed herein. FIG. 9B depicts a cross-sectional close-up view of a conventional bronze bushing as is known in the art. FIG. 9C depicts a cross-sectional close-up view of the fluid control assembly shown in FIG. 9A.

DETAILED DESCRIPTION

The present invention can be understood more readily by reference to the following detailed description, examples, drawings, and claims, and their previous and following description. However, before the present devices, systems, and/or methods are disclosed and described, it is to be understood that this invention is not limited to the specific devices, systems, and/or methods disclosed unless otherwise specified, as such can, of course, vary. It is also to be understood that the terminology used herein is for the purpose of describing particular aspects only and is not intended to be limiting.

The following description of the invention is provided as an enabling teaching of the invention in its best, currently known embodiment. To this end, those skilled in the relevant art will recognize and appreciate that many changes can be made to the various aspects of the invention described herein, while still obtaining the beneficial results of the present invention. It will also be apparent that some of the desired benefits of the present invention can be obtained by selecting some of the features of the present invention without utilizing other features. Accordingly, those who work in the art will recognize that many modifications and adaptations to the present invention are possible and can even be desirable in certain circumstances and are a part of the present invention. Thus, the following description is provided as illustrative of the principles of the present invention and not in limitation thereof.

As used throughout, the singular forms “a,” “an” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a spiral ring” can include two or more such spiral rings unless the context indicates otherwise.

Ranges can be expressed herein as from “about” one particular value, and/or to “about” another particular value. When such a range is expressed, another aspect includes from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent “about,” it will be understood that the particular value forms another aspect. It will be further understood that the endpoints of each of the ranges are significant both in relation to the other endpoint, and independently of the other endpoint.

As used herein, the terms “optional” or “optionally” mean that the subsequently described event or circumstance may or may not occur, and that the description includes instances where said event or circumstance occurs and instances where it does not.

The word “or” as used herein means any one member of a particular list and also includes any combination of members of that list.

As used herein the terms “lower” and “distal” refer to a direction toward a drilling formation (and toward the end of a drilling system including a drill bit), whether the drill string be oriented horizontally, at an upward angle, or a downward angle relative to the horizontal. As used herein, the term “upper” and “proximal” refer to a direction away from a drilling formation (and toward the end of a drilling system opposite the drill bit). Thus, the spearhead of a core barrel assembly is generally positioned at a proximal end of the core barrel assembly, while the lower latch body of a core barrel assembly is generally positioned near a distal end of the core barrel assembly.

Fluid Control Assemblies for Use in Drilling Systems

Disclosed herein are fluid control assemblies for effectively and efficiently controlling the flow of fluid within drilling tools and systems, and systems and methods for using such fluid control assemblies. The disclosed fluid control assemblies can be used in various drilling applications. In some exemplary aspects, the disclosed fluid control assemblies can be used in place of existing indicator bushings within core barrel assemblies or overshot assemblies. In other exemplary aspects, the disclosed fluid control assemblies can be used in place of existing mechanical shut-off valves within core barrel assemblies. In still other exemplary aspects, the disclosed fluid control assemblies can be used in place of existing grease seals within core barrel assemblies.

As further described herein, and with reference to FIGS. 1A-1B, each disclosed fluid control assembly can comprise at least one spiral ring 720, 820, 950. Each spiral ring 720, 820, 950 can have inner surfaces 722, 822, 952 that cooperate to define an inner diameter 724, 824, 954 of the spiral ring and outer surfaces 726, 826, 956 that cooperate to define an outer diameter of the spiral ring. The inner surface 722, 822, 952 can further define a central space 723, 823, 953. As shown in FIGS. 1A-1C, each spiral ring 720, 820, 950 can comprise a single element that is formed into a spiral configuration. In these aspects, it is contemplated that each spiral ring can comprise a single element that is formed into at least first and second circumferential layers, with the second circumferential layer axially spaced from the first circumferential layer relative to a longitudinal axis extending through the central space 723, 823, 953. In order to form the spiral configuration, and as shown in FIGS. 1A-1C, each spiral ring 720, 820, 950 can comprise a crossover portion 725, 825, 955 where the spiral ring extends between the first and second layers. In exemplary aspects, the crossover portion 725, 825, 955 can be positioned at a selected acute angle with respect to the planes of the first and second layers. Each spiral ring 720, 820, 950 can define a groove that is positioned between the first and second layers relative to the longitudinal axis and that terminates proximate the crossover portion 725, 825, 955. In use, each spiral ring 720, 820, 950 can be configured for axial and radial compression and expansion relative to a longitudinal axis that extends through the central space 723.

Optionally, it is contemplated that the at least one spiral ring 720, 820, 950 of each fluid control assembly disclosed herein can comprise a plurality of spiral rings that are positioned axially relative to the longitudinal axis of each respective fluid control assembly. In some optional aspects, the at least one spiral ring 720, 820, 950 can comprise at least two stacked spiral rings. In other optional aspects, the at least one spiral ring 720, 820, 950 can comprise at least two spiral rings that are axially spaced from one another.

Optionally, in further aspects, it is contemplated that each spiral ring 720, 820, 950 can be a single-turn spiral ring. In other optional aspects, it is contemplated that each spiral ring 720, 820, 950 can be a multiple-turn spiral ring, such as, for example and without limitation, a double-turn spiral ring. As one will appreciate, it is contemplated that a multiple-turn spiral ring can comprise a plurality of crossover portions as further described herein, with each turn of the spiral ring comprising a plurality of circumferential layers.

In exemplary aspects, the disclosed spiral rings 720, 820, 950 can optionally be a laminar ring manufactured by Smalley Steel Ring Company. In other exemplary aspects, the disclosed spiral rings 720, 820, 950 can optionally be a FEY laminar ring manufactured by OEM International, Inc. However, it is contemplated that any known spiral ring that is capable of forming a laminar seal can be used.

As further described herein, it is contemplated that the use of spiral rings within the disclosed fluid control assemblies can overcome the deficiencies associated with the use of conventional bushings and compression rings during drilling operations. In particular, it is contemplated that the disclosed fluid control assemblies are not dimensionally sensitive to humidity, can be easily machined to specific dimensions, are not subject to significant wear in drilling applications, and exhibit consistent deformation with continued use.

Fluid Control Assemblies that Provide an Indication of Pressure Changes

In exemplary aspects, and as shown in FIGS. 2A-5C, a fluid control assembly 700 can be used in place of known indicator bushings within core barrel assemblies and overshot assemblies. In one aspect, the fluid control assembly 700 can have a longitudinal axis 710.

In another aspect, the fluid control assembly 700 can comprise at least one spiral ring 720. In this aspect, each spiral ring 720 can have inner surfaces 722 that cooperate to define an inner diameter 724 of the spiral ring and outer surfaces 726 that cooperate to define an outer diameter 728 of the spiral ring. In use, it is contemplated that each spiral ring 720 can be configured for axial and radial compression and expansion relative to the longitudinal axis 710. Optionally, the at least one spiral ring 720 can provide a plurality of stacked spiral rings that are positioned in substantial alignment relative to the longitudinal axis 710.

In a further aspect, the fluid control assembly 700 can comprise a bushing 730 having an outer surface 744 and an inner surface 732 that defines an inlet 734, an outlet 736, a central bore 738 extending between the inlet and the outlet, and at least one slot 740 positioned in communication with the central bore at a location between the inlet and the outlet. In this aspect, the at least one slot 740 of the bushing 730 can be configured to receive the at least one spiral ring 720. In use, the at least one slot 740 can be configured to retain (and accommodate) the at least one spiral ring 720 during axial and radial compression and expansion of the at least one spiral ring. In exemplary aspects, the inlet 734 of the bushing 730 can define a first inner diameter 735 of the bushing, and the first inner diameter of the bushing can be greater than the inner diameter 724 of the at least one spiral ring 720.

In an additional aspect, at least a portion of the inner surface 732 of the bushing 730 between the inlet 734 and the at least one slot 740 of the bushing can be inwardly tapered relative to the longitudinal axis 710 of the fluid control assembly 700. Optionally, in this aspect, it is contemplated that at least a portion of the inner surface 732 of the bushing 730 between the at least one slot 740 and the outlet 736 of the bushing can be outwardly tapered relative to the longitudinal axis 710 of the fluid control assembly 700. In exemplary aspects, the tapered portion of the inner surface 732 between the at least one slot 740 and the outlet 736 of the bushing 730 can be configured to receive at least a portion of a piston, ball, or other valve element.

In a further aspect, the inner surface 732 of the bushing 730 can define a recess (not shown) proximate the at least one slot 740 of the bushing. In this aspect, the recess can be positioned between the at least one slot 140 and the outlet 736 of the bushing 730 relative to the longitudinal axis 710 of the fluid control assembly 700. In exemplary aspects, the recess can be configured to receive at least a portion of a piston or other valve element.

Optionally, in various aspects, the at least one spiral ring 720 of the fluid control assembly can comprise a plurality of spiral rings.

In another aspect, the at least one spiral ring 720 of the fluid control assembly 700 can be configured to circumferentially surround the longitudinal axis 710 when the at least one spiral ring is positioned within the at least one slot 740 of the bushing 730.

In still another aspect, the at least one slot 740 of the bushing 730 can comprise a single slot that circumferentially surrounds the central bore 738 of the bushing.

Optionally, in various exemplary aspects, the outer surface 744 of the bushing 730 can have a first portion positioned proximate the inlet 734 of the bushing and a second portion positioned proximate the outlet 736 of the bushing. In these aspects, the first portion of the outer surface 744 of the bushing 730 can project outwardly from the second portion of the bushing relative to the longitudinal axis 710 of the fluid control assembly 700 such that the first portion of the outer surface defines opposed first and second shoulder surfaces extending substantially perpendicularly relative to the longitudinal axis. It is contemplated that the first portion of the outer surface 744 of the bushing 730 defines a circumferential groove positioned between the first and second shoulder surfaces relative to the longitudinal axis 710 of the fluid control assembly 700.

As shown in FIGS. 4A-4C, the fluid control assembly 700 can be employed within a conventional core barrel assembly 100. In exemplary aspects, the conventional core barrel assembly 100 can comprise a spearhead assembly 110, an upper latch body 120, a latch assembly 130, a valve member 140, at least one fluid port 150, a lower latch body 160, and a spindle 170 as are known in the art. In exemplary aspects, the valve member 140 can be a ball element; however, it is contemplated that any conventional valve member, such as a valve piston, can be used. It is contemplated that the disclosed fluid control assembly 700 can be used in the manner of conventional indicator bushings to control fluid flow within a core barrel assembly.

In operation, it is contemplated that the valve member 140 can move axially relative to the longitudinal axis 710 in and out of engagement with the at least one spiral ring 720 within the bushing 730, thereby forming a valve. More specifically, it is contemplated that the valve member 140 can be positioned against the at least one spiral ring 720, thereby cooperating with the at least one spiral ring and the bushing 730 to seal off a central bore defined by the upper and lower latch bodies. In use, the at least one spiral ring can have a spring resistance response to the travel of the valve member (e.g., valve piston) that varies with the variable geometry of the valve member. It is contemplated that this variable spring resistance response can permit the at least one spiral ring to cooperate with the bushing 730 to generate a pressure signal as further disclosed herein.

In some exemplary aspects, and as depicted in FIGS. 4A-4C, the fluid control assembly 700 can be used with a surface or down-hole core barrel assembly. In these aspects, it is contemplated that a seal will not be formed between the upper and lower latch bodies and the drill string (outer tube) until the core barrel assembly lands against a landing shoulder and landing ring in the manner known in the art. Thus, during tripping of surface or down-hole core barrel assemblies, it is contemplated that the only pressure build-up within the valve (formed by the fluid control assembly 700 and the valve member 140) will be related to drag resistance. It is contemplated that surface or down-hole core barrel assemblies can be operated without the need for braking elements as further disclosed herein with respect to pump-in drilling applications.

In additional aspects, when the valve member 140 comprises a ball member as depicted in FIGS. 4A-4C, it is contemplated that the ball member can be configured to freely pass through the at least one spiral ring 720 and bushing 730 if there is sufficient resistance to the core barrel assembly as it trips into a drill hole. However, in surface or down-hole drilling operations, because there is no resistance as the core barrel assembly falls into the drill hole, the ball cannot overcome the resistance of the at least one spiral ring 720 until the core barrel assembly has landed and formed a seal with the outer annulus (between the latch bodies and the drill string).

In further aspects, when the valve member 140 comprises a valve piston that is connected to a latch retracting case of the latch assembly 130, it is contemplated that the valve piston cannot extend through the at least one spiral ring 720 until the latch assembly is positioned in a deployed position, upon landing of the core barrel assembly. In these aspects, it is contemplated that the latch assembly can comprise latches that are configured to deploy into a groove formed in a locking coupling as is known in the art.

Optionally, in exemplary aspects, the fluid control assembly 700 can be used within a core barrel assembly that is pumped into a drill string at an incline to match the incline of a drill hole. In these aspects, it is contemplated that the at least one spiral ring 720 can cooperate with the bushing 730 to maintain a seal condition As the core barrel assembly is pumped down the drill string, the pump-in force can act on the valve member, causing a proximal end of a channel within the valve member to engage a pin. Thus, in inclined hole pump-in applications, it is contemplated that the pump in force can exert a distally directed force on the valve member 140 and a portion of the core barrel assembly.

Optionally, in pump-in applications, it is contemplated that the core barrel assembly 100 can comprise braking elements (not shown) that ride on an inner diameter of a drill string such that any further distal movement of the braking elements, pin, and valve member 140 relative to a landing member and sleeve can be prevented. Thus, in these applications, it is contemplated that the valve member 140 can be prevented from being pushed through the at least one spiral ring 720 and bushing 730 by the pump in force. Additionally, in these applications, a driving member can be prevented from moving axially in the distal direction relative to the sleeve, which can be retained in a radially retracted portion.

In surface, down-hole, and pump-in applications, when in the drilling position, the valve member 140 can pass distally beyond the at least one spiral ring 720 within the bushing 730. This can allow fluid to flow within the central bore, past the seal. Thus, the fluid control assembly 700 can allow drilling fluid to reach the drill bit to provide flushing and cooling as desired or needed during a drilling process. One will appreciate in light of the disclosure herein that a pressure spike can be created and then released as the core barrel reaches the drilling position and the valve member 140 passes beyond the at least one spiral ring within the bushing 730. This pressure spike can provide an indication to a drill operator that the core barrel assembly has reached the drilling position, and is latched to the drill string.

Optionally, in exemplary pump-in applications, it is contemplated that the fluid control assembly 700 can be designed to allow the valve member 140 described herein to remain closed during retraction of the core barrel assembly such that fluid pressure can be maintained. For such pump-in applications, when the valve member 140 is a valve piston, it is further contemplated that the fluid control assembly 700 can be applied to a core barrel assembly as described herein without a braking mechanism, thereby permitting application of fluid pressure to remove weight and spring force from the latch assembly, ensuring a substantially load-free un-latching process, and preventing build-up of pressurized fluid. In these applications, it is contemplated that the valve piston can be retracted back through the at least one spiral ring 720 as the latch assembly is retracted, permitting retrieval of the head assembly.

In one aspect, in configurations where the outer surface 744 of the bushing 730 of the fluid control assembly 700 has a first portion that projects outwardly from a second portion of the bushing to define first and second shoulder surfaces and a circumferential groove, it is contemplated that the dimensions and aspect ratio of the groove can be selectively varied to provide a reduction in the bushing resistance to the interference fit of the valve member 140 as the valve member passes through the bushing. However, it is contemplated that the circumferential groove can be removed to provide the maximum resistance and as a result a significantly higher fluid pressure build up and greater available supply fluid pump capacity as to allow for deeper hole depths.

In exemplary aspects, and as previously described, it is contemplated that the bushing 730 can allow the valve member 140 to remain closed during retraction of the core barrel assembly such that fluid pressure can be maintained. In these aspects, it is contemplated that the second portion of the outer surface of the bushing 730 functions as an extension which permits the valve to remain closed during retraction of the core barrel assembly. It is further contemplated that the bushing 730 can be applied to a core barrel assembly without a braking mechanism, thereby permitting application of fluid pressure to remove weight and spring force from any suitable latching mechanism, ensuring a substantially load-free un-latching process, and preventing build-up of pressurized fluid.

In exemplary aspects, it is contemplated that the provision of an inwardly tapered inner surface between the inlet 734 of the bushing 730 and the at least one spiral ring 720 can provide an angle transition to guide and gradually centralize the valve member 140 and to generate gradual changes in fluid pressures. In exemplary aspects, when the inner surface 732 of the bushing 730 defines a recess between the at least one spiral ring 720 and the outlet 736 of the bushing, it is contemplated that the relative dimensions and angles of the recess can be configured to achieve a different fit and pressure signal (upon engagement with the valve member 140) when compared to the at least one spiral ring 720.

In other exemplary aspects, a sleeve of the core barrel assembly can have an inner surface that defines an inner projection. In these aspects, it is contemplated that at least a portion of the outer surface 744 of the bushing 730 can be configured for engagement with the inner surface of the sleeve. It is further contemplated that the second shoulder surface of the bushing 730 can be configured for engagement with the inner projection of the sleeve. It is still further contemplated that the inner projection of the sleeve can be positioned proximate a first fluid port of the at least one fluid port such that the outlet 736 of the bushing 730 is in fluid communication with the first fluid port. In exemplary aspects, at least a portion of the second portion of the outer surface 744 of the bushing 730 can overlap with a portion of at least one fluid port 150 relative to the longitudinal axis of the core barrel assembly such that a portion of the second portion of the outer surface of the bushing is substantially adjacent to an innermost portion of the fluid port.

In another aspect, the lower latch body 160 can be removably coupled to the sleeve. In this aspect, it is contemplated that the first shoulder surface of the bushing 730 can be configured for engagement with the lower latch body. It is further contemplated that the lower latch body can have a first surface that defines an outlet in fluid communication with the inlet 734 of the bushing 730, with the outlet of the lower latch body being in communication with the central bore.

In an additional aspect, it is contemplated that the central bore 738 of the bushing 730 can be configured to receive at least a portion of the valve member 140 such that axial movement of the valve member 140 relative to the longitudinal axis 710 of the fluid control subassembly 700 selectively controls fluid flow through the bushing 730. It is further contemplated that at least a portion of the valve member 140 can remain within the central bore 738 of the bushing 730 at all times.

In exemplary aspects, the valve member 140 can be moveable about and between a blocking position and an open position. In these aspects, in the open position, the valve member 140 can be positioned between the at least one spiral ring 720 of the fluid control assembly 700 and the inlet 734 of the bushing 730 such that the valve member is disengaged from the inner surface 732 of the bushing. In the blocking position, a portion of the valve member 120 can be configured for engagement with at least a portion of the inner surface 732 of the bushing 730. For example, it is contemplated that a portion of the valve member 140 can be configured for engagement with the inner surface 732 of the bushing 730 between the at least one spiral ring 720 of the bushing and the outlet 736 of the bushing. In further aspects, it is contemplated that the recess of the bushing 730 can be configured to receive at least a portion of the valve member 140 when the valve member is positioned in the blocking position. In these aspects, in order to move the valve member from the blocking position to the open position, an axial force sufficient to advance the portion of the piston out of the recess and past the at least one spiral ring 720 must be applied. It is contemplated that the axial force must also be sufficient to overcome any water that is resting against the portion of the valve member 140.

It is contemplated that the positioning of the valve member 140 in the open position (such as, for example, by passage of a portion of the valve member through the at least one spiral ring 720 of the fluid control assembly 700) can cause a pressure drop as water begins draining through the central bore 738 of the bushing 730 and the at least one fluid port 150 of the sleeve. Thus, it is contemplated that the valve member 140 can function as a landing indicator for the core barrel assembly.

In additional aspects, it is contemplated that an end portion of the valve member 140 and the outlet 736 of the bushing 730 can have respective diameters. In these aspects, it is contemplated that the diameter of the outlet 736 can be less than or equal to the diameter of the end portion of the valve member 140 such that the end portion of the valve member is positioned within the bushing 730 in an interference fit. In additional aspects, the first inner diameter 735 of the bushing 730 (defined by the inlet 734 of the bushing as described above) can be greater than the diameter of the end portion of the valve member. In still further aspects, the inner diameter 724 of the at least one spiral ring 720 can be less than the diameter of the end portion of the valve member. In still further aspects, when the valve member comprises a piston, the piston can have an elongate shaft portion with a diameter that is less than the diameter of the end portion of the piston. In exemplary aspects, the end portion of the piston can conform to the shape of the recess and the at least one spiral ring 720 such that, when the end portion of the piston is positioned within the recess, the end portion of the piston cooperates with the at least one spiral ring to maintain a blocking position in which water cannot pass around the piston.

In use, following engagement between the valve member 140 and the at least one spiral ring 720 as described above, it is contemplated that continued axial movement of the valve member through the fluid control assembly 700 can effect radial and/or axial expansion of the at least one spiral ring until the valve member passes through the at least one spiral ring, at which time the at least one spiral ring can return to a radially and axially compressed position.

As shown in FIGS. 5A-5C, the fluid control assembly 700 can be employed within a conventional overshot assembly 300. In exemplary aspects, the conventional overshot assembly 300 can comprise a swivel 310, a swivel eye 320, an upper body portion 330, at least one seal 340, a seal seat 350, a valve member 360, and an overshot head 370 as are known in the art. In exemplary aspects, the valve member 140 can be a ball element; however, it is contemplated that any conventional valve member, such as a valve piston, can be used. In exemplary aspects, the fluid control assembly 700 can be at least partially received within the overshot head 370 and be positioned in abutting relation to a distal end of the seal seat 350. The valve member 360 can be at least partially received within the fluid control assembly 700 and configured for axial movement relative to the longitudinal axis 710 of the fluid control assembly. It is contemplated that the disclosed fluid control assembly 700 can be used in the manner of conventional indicator bushings to control fluid flow within an overshot assembly. Generally, it is contemplated that the valve member 360 and the fluid control assembly 700 can be configured to control fluid flow in the same manner as valve member 140 and fluid control assembly 700, discussed above.

In exemplary aspects, when the overshot assembly 300 is a pump-in overshot assembly, it is contemplated that the fluid control assembly 700 can provide an internal seal, which, in combination with an external seal provided by the overshot assembly, can allow tripping in under fluid pressure. It is further contemplated that following opening of the fluid control assembly 700 after landing of the overshot assembly, the fluid control assembly can be configured to allow for fluid bypass during retraction of the overshot assembly to prevent fluid from being forced out of a flat or declined drill hole when tripping out of the hole. This is in contrast to conventional overshot designs, which either do not have a fluid control valve at all (requiring retraction of any retained column of fluid along with the retracted head assembly) or have a simple fluid control valve without any landing indication feature.

In further exemplary aspects, the fluid control assembly 700 can be configured to remain in an open condition to permit retraction of a head assembly in an inclined drill hole. In these aspects, it is contemplated that the fluid control assembly 700 must be in an open condition to permit unloading of the latching mechanism and to permit unloading of a latch mechanism, and to permit unloading of a braking assembly.

Fluid Control Assemblies that Serve as Mechanical Shut-Off Valves

In exemplary aspects, and as shown in FIGS. 6A-8B, a fluid control assembly 800 can be used in place of known mechanical shut-off valves within core barrel assemblies. In one aspect, the fluid control assembly 800 can have a longitudinal axis 810.

In another aspect, the fluid control assembly 800 can comprise at least one spiral ring 820. In this aspect, each spiral ring 820 can have inner surfaces 822 that cooperate to define an inner diameter 824 of the spiral ring and outer surfaces 826 that cooperate to define an outer diameter 828 of the spiral ring. In use, it is contemplated that each spiral ring 820 can be configured for axial and radial compression and expansion relative to the longitudinal axis 810.

In an additional aspect, the fluid control assembly 800 can comprise at least one tapered ring 830. In this aspect, each tapered ring 830 can have a distal first end, an opposed (proximal) second end, an inner surface, and an outer surface. The inner surface of each tapered ring 830 can define a central bore extending from the first end to the second end of the tapered ring. The outer surface of each tapered ring can be outwardly tapered relative to the longitudinal axis 810 of the fluid control assembly 800 moving in a proximal direction from the first end to the second end of the tapered ring 830. It is contemplated that the first end of each tapered ring 830 can have a first outer diameter that is less than the inner diameter of each spiral ring 820.

In exemplary aspects, each spiral ring 820 can be configured to circumferentially surround at least the first end of a respective tapered ring 830. In these aspects, it is contemplated that movement of the at least one tapered ring 830 relative to the longitudinal axis 810 of the fluid control assembly 800 can effect radial compression and expansion of the at least one spiral ring 820 relative to the longitudinal axis of the fluid control assembly.

Optionally, the at least one spiral ring 820 can comprise a plurality of spiral rings, and the at least one tapered ring 830 can comprise a plurality of tapered rings.

Optionally, in further aspects, and as shown in FIGS. 6A-7B, the fluid control assembly 800 can further comprise at least one spring element 850. In these aspects, each spring element 850 can have a minimum inner diameter and a maximum outer diameter. It is contemplated that the maximum outer diameter of each spring element can be greater than the inner diameter of each spiral ring 820. Optionally, in exemplary aspects, the at least one spring element 850 can comprise at least one spring disc. Optionally, in further exemplary aspects, the at least one spring element 850 can comprise at least one inverted spring disc, such as, for example and without limitation an inverted Belleville washer.

In additional aspects, the at least one spring element 850 can be configured to provide resistance to axial movement of the at least one tapered ring 830 relative to the longitudinal axis 810 of the fluid control assembly 800. Optionally, in these aspects, each respective spring element 850 can be positioned in contact with at least one tapered ring 830.

As shown in FIGS. 6A-8B, the fluid control assembly 800 can be employed within a conventional core barrel assembly 100. In exemplary aspects, the conventional core barrel assembly 100 can comprise a spearhead assembly 110, an upper latch body 120, a latch assembly 130, a lower latch body 160, a spindle 170, a bearing assembly, and an inner (core sample) tube cap as are known in the art. The spindle 170 can comprise a flange portion that projects radially relative to adjoining portions of the spindle, and the fluid control assembly 800 can be positioned between the flange portion of the spindle 170 and the bearing assembly relative to the longitudinal axis of the fluid control assembly 810. It is contemplated that the disclosed fluid control assembly 800 can be used in the manner of conventional mechanical shut-off valves to control fluid flow within a core barrel assembly.

A first exemplary configuration of the fluid control assembly 800 is depicted in FIGS. 6A-6B. As shown, in one aspect, the fluid control assembly 800 can comprise at least two spiral rings 820, at least two tapered rings 830, and at least two spring elements 850. In this aspect, each respective tapered ring 830 can be at least partially received within a respective spiral ring 820, with the distal first ends of each respective tapered ring received within a respective spiral ring. In an additional aspect, a portion of the outer surface of each respective tapered ring can be positioned in engagement with at least a portion of the inner surfaces of a respective spiral ring 820. In another aspect, a top portion of each spring element 850 can have an outer portion positioned in engagement with at least a portion of a distal surface of a respective spiral ring 820. Optionally, in a further aspect, the top portion of each spring element 850 can have an inner portion positioned in engagement with at least a portion of the distal first end of a respective tapered ring 830. In an additional aspect, the at least two tapered rings can optionally comprise a proximal tapered ring and a distal tapered ring, with the second (proximal) end of the proximal tapered ring being positioned substantially flush to the flange portion of the spindle 170. In this aspect, it is further contemplated that an inner portion of the second (proximal) end of the distal tapered ring can be positioned in engagement with a portion of a first spring element positioned between the proximal and distal tapered rings relative to the longitudinal axis of the fluid control assembly. It is further contemplated that a second spring element can be positioned between the distal tapered ring and the bearing assembly of the core barrel assembly, with at least an inner portion of the second spring element being positioned in engagement with the bearing assembly.

A second exemplary configuration of the fluid control assembly 800 is depicted in FIGS. 7A-7B. As shown, in one aspect, the fluid control assembly 800 can comprise at least two spiral rings 820, at least two tapered rings 830, and at least two spring elements 850. In this aspect, each respective tapered ring 830 can be at least partially received within a respective spiral ring 820, with the distal first ends of each respective tapered ring received within a respective spiral ring. In an additional aspect, a portion of the outer surface of each respective tapered ring 830 can be positioned in engagement with at least a portion of the inner surfaces of a respective spiral ring 820. In another aspect, a top portion of each spring element 850 can have an outer portion positioned in engagement with at least a portion of a distal surface of a respective spiral ring 820. Optionally, in a further aspect, the top portion of each spring element 850 can have an inner portion that is axially spaced from the distal end of a respective tapered ring 830 when the spring element is in an expanded position. In an additional aspect, the at least two tapered rings can optionally comprise a proximal tapered ring and a distal tapered ring, with the second (proximal) end of the proximal tapered ring being positioned substantially flush to the flange portion of the spindle 170. In this aspect, it is further contemplated that the at least two spiral rings can comprise proximal and distal spiral rings, with an outer portion of the second (proximal) end of the distal tapered ring being positioned in engagement with a portion of the proximal spiral ring. It is further contemplated that a second spring element can be positioned between the distal spiral ring and the bearing assembly of the core barrel assembly, with at least an outer portion of the second spring element being positioned in engagement with the bearing assembly.

A third exemplary configuration of the fluid control assembly 800 is depicted in FIGS. 8A-8B. As shown, in one aspect, the fluid control assembly 800 can comprise at least two spiral rings 820 and at least two tapered rings 830. In this aspect, each respective tapered ring 830 can be at least partially received within a respective spiral ring 820, with the distal first ends of each respective tapered ring received within a respective spiral ring. In an additional aspect, a portion of the outer surface of each respective tapered ring 830 can be positioned in engagement with at least a portion of the inner surfaces of a respective spiral ring 820. In an additional aspect, the at least two tapered rings can optionally comprise a proximal tapered ring and a distal tapered ring, with the second (proximal) end of the proximal tapered ring being positioned substantially flush to the flange portion of the spindle 170. In this aspect, it is further contemplated that the at least two spiral rings can comprise proximal and distal spiral rings, with the second (proximal) end of the distal tapered ring being positioned in engagement with a portion of the proximal spiral ring. It is further contemplated that the distal spiral ring can be positioned between and in engagement with the distal tapered ring and the bearing assembly of the core barrel assembly.

When the fluid control assembly 800 comprises spring elements 850 as disclosed herein, it is contemplated that the spring elements can provide additional spring resistance and travel to permit an inner (core sample) tube cap to absorb the load of a blocked or filled inner (core sample) tube that is resisting the feed force from a drill rig. It is contemplated that the at least one spiral ring of the fluid control assembly 800 can be configured for sufficient radial growth to sealingly engage an outer tube of the core barrel assembly and close the annular fluid passage defined between the upper and lower latch bodies and the outer tube.

It is contemplated that the spring elements 850 can be omitted from the fluid control assembly 800 when the at least one spiral ring 820 has sufficient spring resistance and is capable of sufficient radial growth to form an annular seal with the outer tube of the core barrel assembly.

In use, the at least one spiral ring 820 can have a spring resistance response to the travel of the valve member that varies with the variable geometry of the tapered rings 830. It is contemplated that this variable spring resistance response can permit the at least one spiral ring to close off the annular passage as discussed above to thereby generate a pressure signal that can be sensed by drilling operators.

Fluid Control Assemblies that Serve as Grease Seals

In exemplary aspects, and as shown in FIGS. 9A and 9C, a fluid control assembly 900 can be used in place of known fluid seals (e.g., grease seals) within core barrel assemblies, such as, for example and without limitation, bronze bushings within core barrel assemblies. In one aspect, a core barrel assembly 100 having such a fluid control assembly 900 can have a longitudinal axis 110. A conventional bronze bushing 168 is shown in FIG. 9B. In the same manner of conventional bronze bushings, it is contemplated that the disclosed fluid control assembly 900 can allow for relative rotary motion of mating parts of a core sample tube cap (inner tube cap), which have slight clearance fits in either the inner diameter or the outer diameter.

In another aspect, the core barrel assembly 100 can comprise an upper latch body and a lower latch body 160 that cooperates with the upper latch body to define an inner channel 162. Optionally, the lower latch body 160 can comprise a spindle 170 that defines at least a portion of the inner channel 162. In an additional aspect, the lower latch body 160 can comprise a core sample tube cap and a valve body 164 (e.g., check valve body) that has an outer surface 166, with the valve body being operatively received within the core sample tube cap.

In a further aspect, the core barrel assembly 100 can comprise a core sample tube (not shown) operatively coupled to the core sample tube cap of the lower latch body 160 and positioned in fluid communication with the inner channel 162 of the lower latch body.

In an additional aspect, the fluid control assembly 900 of the core barrel assembly 100 can comprise at least one spiral ring 952. Each spiral ring 952 can have inner surfaces 954 that cooperate to define an inner diameter 956 of the spiral ring and outer surfaces 958 that cooperate to define an outer diameter 960 of the spiral ring. In use, it is contemplated that each spiral ring 952 can be configured for axial and radial compression and expansion relative to the longitudinal axis 110 of the core barrel assembly 100.

In a further aspect, the inner surfaces 954 of the at least one spiral ring 952 of the fluid control assembly 950 can be positioned in circumferential engagement with the outer surface 166 of the valve body 164 of the lower latch body 160. In this aspect, it is contemplated that the fluid control assembly 950 can be configured to permit axial movement of core sample tube relative to the lower latch body 160. It is further contemplated that, during such axial movement, the fluid control assembly 950 can be configured to maintain a seal between an inner surface of the core sample tube cap and the valve body 164. In use, it is contemplated that the at least one spiral ring 952 of the fluid control assembly 950 can exhibit spring expansion, which allows for slightly eccentric motion if a mating component of the core sample tube cap is not properly aligned or is not running “true” to another mating component of the core sample tube due to manufacturing tolerances, abuse, or bending overload.

It is contemplated that the fluid control assembly 950 of the core barrel assembly 100 can be used in the manner of conventional sealing elements to control fluid flow within the core barrel assembly.

In exemplary applications, the fluid control assembly 950 can be configured to control the flow of grease within the lower latch body 160. It is contemplated that the retention of grease can provide lubrication of one or more bearings housed within the core sample tube cap, while also preventing entry of foreign debris into the core sample tube cap, thereby preventing accelerated wear of the mating parts of the core sample tube cap or the housed bearings.

Exemplary Aspects

In view of the described fluid control assemblies, core barrel assemblies, overshot assemblies, and methods and variations thereof, herein below are described certain more particularly described aspects of the invention. These particularly recited aspects should not however be interpreted to have any limiting effect on any different claims containing different or more general teachings described herein, or that the “particular” aspects are somehow limited in some way other than the inherent meanings of the language literally used therein.

Aspect 1: A fluid control assembly having a longitudinal axis, comprising: at least one spiral ring, each spiral ring having inner surfaces that cooperate to define an inner diameter of the spiral ring and outer surfaces that cooperate to define an outer diameter of the spiral ring, wherein the spiral ring is configured for axial and radial compression and expansion relative to the longitudinal axis; a bushing having an inner surface that defines an inlet, an outlet, a central bore extending between the inlet and the outlet, and at least one slot positioned in communication with the central bore at a location between the inlet and the outlet, wherein the at least one slot of the bushing is configured to receive the at least one spiral ring, wherein the at least one slot is configured to retain the at least one spiral ring during axial and radial compression and expansion of the at least one spiral ring.

Aspect 2: The fluid control assembly of aspect 1, wherein the inlet of the bushing defines a first inner diameter of the bushing, and wherein the first inner diameter of the bushing is greater than the inner diameter of the at least one spiral ring.

Aspect 3: The fluid control assembly of aspect 2, wherein at least a portion of the inner surface of the bushing between the inlet and the at least one slot of the bushing is inwardly tapered relative to the longitudinal axis of the fluid control assembly.

Aspect 4: The fluid control assembly of aspect 2, wherein the inner surface of the bushing defines a recess proximate the at least one slot of the bushing, the recess being positioned between the at least one slot and the outlet of the bushing relative to the longitudinal axis of the fluid control assembly.

Aspect 5: The fluid control assembly of aspect 4, wherein the recess is configured to receive at least a portion of a piston.

Aspect 6: The fluid control assembly of aspect 3, wherein at least a portion of the inner surface of the bushing between the at least one slot and the outlet of the bushing is outwardly tapered relative to the longitudinal axis of the fluid control assembly.

Aspect 7: The fluid control assembly of aspect 6, wherein the tapered portion of the inner surface between the at least one slot and the outlet of the bushing is configured to receive at least a portion of a valve member, wherein the valve member is selected from the group consisting of a ball element and a valve piston.

Aspect 8: The fluid control assembly of aspect 2, wherein the at least one spiral ring is configured to circumferentially surround the longitudinal axis of the fluid control assembly when the at least one spiral ring is positioned within the at least one slot of the bushing.

Aspect 9: The fluid control assembly of aspect 1, wherein the at least one slot of the bushing comprises a single slot that circumferentially surrounds the central bore of the bushing.

Aspect 10: The fluid control assembly of aspect 1, wherein the outer surface of the bushing has a first portion positioned proximate the inlet of the bushing and a second portion positioned proximate the outlet of the bushing, wherein the first portion of the outer surface of the bushing projects outwardly from the second portion of the bushing relative to the longitudinal axis of the fluid control assembly such that the first portion of the outer surface defines opposed first and second shoulder surfaces extending substantially perpendicularly relative to the longitudinal axis.

Aspect 11: The fluid control assembly of aspect 10, wherein the first portion of the outer surface of the bushing defines a circumferential groove positioned between the first and second shoulder surfaces relative to the longitudinal axis of the bushing.

Aspect 12: A core barrel head assembly comprising the fluid control assembly recited in any one of aspects 1-11.

Aspect 13: An overshot assembly comprising the fluid control assembly recited in any one of aspects 1-11.

Aspect 14: A method of controlling fluid flow within a core barrel head assembly using the fluid control assembly recited in any one of aspects 1-11.

Aspect 15: A method of controlling fluid flow within an overshot assembly using the fluid control assembly recited in any one of aspects 1-11.

Aspect 16: A fluid control assembly having a longitudinal axis, comprising: at least one spiral ring, each spiral ring having inner surfaces that cooperate to define an inner diameter of the spiral ring and outer surfaces that cooperate to define an outer diameter of the spiral ring, wherein the spiral ring is configured for axial and radial compression and expansion relative to the longitudinal axis; and at least one tapered ring, each tapered ring having a first end, an opposed second end, an inner surface, and an outer surface, wherein the inner surface of each tapered ring defines a central bore extending from the first end to the second end of the tapered ring, wherein the outer surface of each tapered ring is outwardly tapered relative to the longitudinal axis of the fluid control assembly moving from the first end to the second end of the tapered ring, wherein the first end of each tapered ring has a first outer diameter that is less than the inner diameter of each spiral ring, wherein each spiral ring is configured to circumferentially surround at least the first end of a respective tapered ring, and wherein movement of the at least one tapered ring relative to the longitudinal axis of the fluid control assembly is configured to effect radial compression and expansion of the at least one spiral ring relative to the longitudinal axis of the fluid control assembly.

Aspect 17: The fluid control assembly of aspect 16, wherein the at least one spiral ring comprises a plurality of spiral rings, and wherein the at least one tapered ring comprises a plurality of tapered rings.

Aspect 18: The fluid control assembly of aspect 16, further comprising at least one spring element, wherein each spring element has a minimum inner diameter and a maximum outer diameter, wherein the maximum outer diameter of each spring element is greater than the inner diameter of each spiral ring.

Aspect 19: The fluid control assembly of aspect 18, wherein the at least one spring element is configured to provide resistance to axial movement of the at least one tapered ring relative to the longitudinal axis of the fluid control assembly.

Aspect 20: The fluid control assembly of aspect 19, wherein each respective spring element is positioned in contact with at least one tapered ring.

Aspect 21: The fluid control assembly of aspect 18, wherein the at least one spring element comprises at least one spring disc.

Aspect 22: A core barrel head assembly comprising the fluid control assembly recited in any one of aspects 16-21.

Aspect 23: A method of controlling fluid flow within a drill string using the fluid control assembly recited in any one of aspects 16-21.

Aspect 24: A core barrel assembly having a longitudinal axis, comprising: an upper latch body; a lower latch body that cooperates with the upper latch body to define an inner channel, the lower latch body comprising a core sample tube cap and a valve body, the valve body having an outer surface and being operatively received within the core sample tube cap; a core sample tube operatively coupled to the core sample tube cap of the lower latch body and positioned in selective fluid communication with the inner channel of the lower latch body; and a fluid control assembly comprising at least one spiral ring, each spiral ring having inner surfaces that cooperate to define an inner diameter of the spiral ring and outer surfaces that cooperate to define an outer diameter of the spiral ring, wherein the spiral ring is configured for axial and radial compression and expansion relative to the longitudinal axis, wherein the inner surfaces of the at least one spiral ring of the fluid control assembly are positioned in circumferential engagement with the outer surface of the valve body of the lower latch body, and wherein the fluid control assembly is configured to permit axial movement of the core sample tube relative to the lower latch body.

Aspect 25: The core barrel assembly of aspect 24, wherein the fluid control assembly is configured to control the flow of grease within the lower core barrel subassembly.

Aspect 26: A method of controlling fluid flow using the core barrel assembly recited in any one of aspects 24-25.

Although several embodiments of the invention have been disclosed in the foregoing specification, it is understood by those skilled in the art that many modifications and other embodiments of the invention will come to mind to which the invention pertains, having the benefit of the teaching presented in the foregoing description and associated drawings. It is thus understood that the invention is not limited to the specific embodiments disclosed hereinabove, and that many modifications and other embodiments are intended to be included within the scope of the appended claims. Moreover, although specific terms are employed herein, as well as in the claims which follow, they are used only in a generic and descriptive sense, and not for the purposes of limiting the described invention, nor the claims which follow.

Claims

1. A fluid control assembly having a longitudinal axis, comprising:

at least one ring, each ring having inner surfaces that cooperate to define an inner diameter of the ring and outer surfaces that cooperate to define an outer diameter of the ring, wherein the ring is configured for axial and radial compression and expansion relative to the longitudinal axis;

a bushing having an inner surface that defines an inlet, an outlet, a central bore extending between the inlet and the outlet, and at least one slot positioned in communication with the central bore at a location between the inlet and the outlet, wherein the at least one slot of the bushing is configured to receive the at least one ring, wherein the at least one slot is configured to retain the at least one ring during axial and radial compression and expansion of the at least one ring.

2. The fluid control assembly of claim 1, wherein the inlet of the bushing defines a first inner diameter of the bushing, and wherein the first inner diameter of the bushing is greater than the inner diameter of the at least one ring.

3. The fluid control assembly of claim 2, wherein at least a portion of the inner surface of the bushing between the inlet and the at least one slot of the bushing is inwardly tapered relative to the longitudinal axis of the fluid control assembly.

4. The fluid control assembly of claim 2, wherein the inner surface of the bushing defines a recess proximate the at least one slot of the bushing, the recess being positioned between the at least one slot and the outlet of the bushing relative to the longitudinal axis of the fluid control assembly.

5. The fluid control assembly of claim 4, wherein the recess is configured to receive at least a portion of a piston.

6. The fluid control assembly of claim 3, wherein at least a portion of the inner surface of the bushing between the at least one slot and the outlet of the bushing is outwardly tapered relative to the longitudinal axis of the fluid control assembly.

7. The fluid control assembly of claim 6, wherein the tapered portion of the inner surface between the at least one slot and the outlet of the bushing is configured to receive at least a portion of a valve member, wherein the valve member is selected from the group consisting of a ball element and a valve piston.

8. The fluid control assembly of claim 2, wherein the at least one ring is configured to circumferentially surround the longitudinal axis of the fluid control assembly when the at least one ring is positioned within the at least one slot of the bushing.

9. The fluid control assembly of claim 1, wherein the at least one slot of the bushing comprises a single slot that circumferentially surrounds the central bore of the bushing.

10. The fluid control assembly of claim 1, wherein the outer surface of the bushing has a first portion positioned proximate the inlet of the bushing and a second portion positioned proximate the outlet of the bushing, wherein the first portion of the outer surface of the bushing projects outwardly from the second portion of the bushing relative to the longitudinal axis of the fluid control assembly such that the first portion of the outer surface defines opposed first and second shoulder surfaces extending substantially perpendicularly relative to the longitudinal axis.

11. The fluid control assembly of claim 10, wherein the first portion of the outer surface of the bushing defines a circumferential groove positioned between the first and second shoulder surfaces relative to the longitudinal axis of the bushing.

12-23. (canceled)

24. A core barrel assembly having a longitudinal axis, comprising:

an upper latch body;

a lower latch body that cooperates with the upper latch body to define an inner channel, the lower latch body comprising a core sample tube cap and a valve body, the valve body having an outer surface and being operatively received within the core sample tube cap;

a core sample tube operatively coupled to the core sample tube cap of the lower latch body and positioned in selective fluid communication with the inner channel of the lower latch body; and

a fluid control assembly comprising at least one ring, each ring having inner surfaces that cooperate to define an inner diameter of the ring and outer surfaces that cooperate to define an outer diameter of the ring, wherein the ring is configured for axial and radial compression and expansion relative to the longitudinal axis,

wherein the inner surfaces of the at least one ring of the fluid control assembly are positioned in circumferential engagement with the outer surface of the valve body of the lower latch body, and

wherein the fluid control assembly is configured to permit axial movement of the core sample tube relative to the lower latch body.

25. The core barrel assembly of claim 24, wherein the fluid control assembly is configured to control the flow of grease within the lower core barrel subassembly.

26. (canceled)

27. A core barrel assembly comprising:

fluid control assembly having a longitudinal axis and comprising: at least one ring, each ring having inner surfaces that cooperate to define an inner diameter of the ring and outer surfaces that cooperate to define an outer diameter of the ring, wherein the ring is configured for axial and radial compression and expansion relative to the longitudinal axis; and a bushing having an inner surface that defines an inlet, an outlet, a central bore extending between the inlet and the outlet, and at least one slot positioned in communication with the central bore at a location between the inlet and the outlet, wherein the at least one slot of the bushing is configured to receive the at least one ring, wherein the at least one slot is configured to retain the at least one ring during axial and radial compression and expansion of the at least one ring,

wherein the fluid control assembly is configured to control the flow of fluid through at least a portion of the core barrel assembly.

28. The core barrel assembly of claim 27, wherein the inlet of the bushing defines a first inner diameter of the bushing, and wherein the first inner diameter of the bushing is greater than the inner diameter of the at least one ring.

29. The core barrel assembly of claim 28, wherein at least a portion of the inner surface of the bushing between the inlet and the at least one slot of the bushing is inwardly tapered relative to the longitudinal axis of the fluid control assembly.

30. The core barrel assembly of claim 28, wherein the inner surface of the bushing defines a recess proximate the at least one slot of the bushing, the recess being positioned between the at least one slot and the outlet of the bushing relative to the longitudinal axis of the fluid control assembly.

31. The core barrel assembly of claim 30, wherein the recess is configured to receive at least a portion of a piston.

32. The core barrel assembly of claim 30, wherein at least a portion of the inner surface of the bushing between the at least one slot and the outlet of the bushing is outwardly tapered relative to the longitudinal axis of the fluid control assembly, wherein the tapered portion of the inner surface between the at least one slot and the outlet of the bushing is configured to receive at least a portion of a valve member, and wherein the valve member is selected from the group consisting of a ball element and a valve piston.

33. The fluid control assembly of claim 29, wherein the at least one ring is configured to circumferentially surround the longitudinal axis of the fluid control assembly when the at least one ring is positioned within the at least one slot of the bushing.