Abstract: A method and apparatus for recovering cores from downhole environments where down hole environmental parameters are measured during coring operations to maximize the success of core recovery.

Abstract: A coring drill tool driving structure has a driving motor (7), an outer cylinder (23) and a coring drill tool (8). The driving motor comprises an outer rotor (73) and an inner stator (75), the inner wall of the outer rotor and the outer wall of the inner stator are provided with ribs (77) mutually matched, the outer rotor and inner stator are in clearance fit, the clearance between the outer rotor and the inner stator is a driving liquid flow path (74), the outer rotor length is smaller than the inner stator length, the outer rotor is located between front and rear ends of the inner stator, the outer rotor is connected to the outer cylinder, a front end of the outer cylinder is connected to the coring drill tool, and a rear end of the inner stator is connected to a coupling (76).

Abstract: A valve including a housing having an inlet and an outlet, a piston disposed in the housing, the piston having a first end and a second end, the piston movable between a position blocking fluid flow between the inlet and the outlet and a position allowing fluid flow between the inlet and the outlet, a pressure balance pathway through the housing porting the same pressure to both first and second ends of the piston, an actuator responsive to applied pressure on the valve, the actuator attached to the piston and a biasing arrangement configured to bias the actuator toward a closed position of the valve. A method for injecting a sequestration fluid including maintaining the fluid at a supercritical phase upstream of a valve, opening the valve by increasing pressure of the fluid, delaying phase change of the fluid from supercritical to gas.

Abstract: A crimping connection for an inner tube is disclosed. An inner barrel system includes a first coring inner barrel; a second coring inner barrel; and a crimp ring overlapping an end of the first coring inner barrel and an end of the second coring inner barrel and compressed to mechanically couple the first coring inner barrel with the second coring inner barrel.

Abstract: A method and apparatus for monitoring and reporting corrosion in terms recognized as conforming to an industry standard includes coating a substrate with a corrodible metallic substance of predetermined thickness, passing a current through the metallic substance, and generating a signal when electrical continuity is broken due to corrosion of the metallic substance. In one embodiment the apparatus includes a printed circuit board onto which the coated substrate is mounted, a power source for applying an electrical current across the coated substrate, and a display (such as a light or LCD panel) for providing an indication/alert that electrical continuity has been broken due to corrosion of the metallic substance.

Abstract: In one example of rotational ranging in a wellbore in which a wellbore component having an axis of rotation is disposed, a wellbore ranging sensor is disposed on a circumferential area surrounding the axis of rotation. The sensor is moved on the circumferential area to multiple distinct sensing positions. At each sensing position, a magnetic field from another wellbore that is apart from the wellbore is measured resulting in multiple magnetic field measurements at the multiple distinct sensing positions. The multiple magnetic field measurements are provided to determine a position of the wellbore relative to the other wellbore using at least a subset of the multiple magnetic field measurements.

Abstract: Methods of procuring a core sample may involve engaging an earth formation with a cutting structure of a coring bit. A core sample may be received within a receptacle connected to the coring bit, the receptacle being lined with a sponge material. A space of about 1 mm or less may be maintained between the core sample and the sponge material. Coring tools may include a coring bit comprising an inner gage and an outer gage and a sponge material positioned to at least partially surround a core sample cut by the coring bit. A radial distance between an inner surface of the sponge material and the inner gage of the coring bit may be about 1 mm or less. A distance between a center of curvature of the inner gage and a center of curvature of the outer gage may be about 0.3 mm or less.

Abstract: An inner barrel assembly for use with a coring tool may include a sleeve located coaxially within an inner barrel in a telescoping manner. The core barrel assembly may also include a cap located above a top end of the sleeve when the inner barrel assembly is in an initial coring position. The cap may include a skirt having a portion extending downwardly from the cap. A coring tool including an inner barrel assembly and methods of forming an inner barrel assembly are also disclosed.

Abstract: A coring extender for a coring tool is provided. The coring tool is deployable by a downhole tool into a wellbore. The coring extender includes a housing operatively connectable to the downhole tool, a mandrel, and seals. The housing has fluid chambers therein. The mandrel is positionable in the housing, and includes a locking tube operatively connectable to the housing and a coupling tube operatively connectable to the coring tool. The coupling tube is adjustably positionable relative to the locking tube such that a length of the mandrel is adjustably defined therebetween. The coupling tube has an outer surface slidably positionable along an inner surface of the housing. Seals are positionable between the mandrel and the housing to define a fluid pocket to isolate the fluid therebetween as the coupling tube moves along the housing whereby the fluid permitted to flow about the fluid pocket to balance between the fluid chambers.

Abstract: A housing (15) for connection to a downhole assembly (17), the housing comprising first and second sections (31, 32), the first section (31) being adapted for connection to a portion of the downhole assembly, the second section (32) defining a compartment (23) to receive a downhole tool (11) or component thereof, the second section (32) being configured to provide a path (40) for fluid flow past the compartment (23) as the assembly descends within the borehole, and the first section (31) being configured for fluid communication between a passage in said portion of the downhole assembly and the fluid flow path (40).

Abstract: A pressure coring apparatus comprises a housing having an upper end and a lower end. A valve is coupled to the lower end of the housing and has an open position for entrance of a core and a closed position for retaining and sealing the core within the housing. A piston assembly is moveably disposed within the housing. A first volume is defined within the housing and between the upper end of the housing and the piston assembly. A second volume is defined within the housing between the lower end of the housing and the piston assembly. A pressure relief device is disposed through the housing and operable to maintain pressure within the first volume and the second volume below a target pressure.

Abstract: Drill stern test apparatus includes a drill string, wireline coring system and a downhole tool that is seated in the core barrel of the coring system. A valve packer within the downhole tool is inflated to seal the core barrel and allow a valve to be operated by movement of the drill string. One or more packers can be inflated to isolate the test zone in the borehole below the coring system. The apparatus is operated to allow the test zone fluid to flow upwardly in the downhole tool and be measured. Downhole tool transducers accumulate the data and transmit the same to the surface. The wireline can be pulled to relieve packer inflation pressure, release a latch and allow the downhole tool to be pulled to the surface while leaving the coring system in place.

Abstract: A sidewall coring apparatus for obtaining a plurality of formation cores from a sidewall of a wellbore includes a core catching tube configured to be sealed downhole and to store the plurality of formation cores therein. The core catching tubes includes an inner sleeve and an outer sleeve concentric with the inner sleeve. The inner and outer sleeves include corresponding slots configured to align in response to relative movement of the inner and outer sleeves, and when aligned the slots of the inner and outer sleeves allow evacuation of fluid from the core catching tube as each of the plurality of formation cores is inserted into the core catching tube.

Abstract: A core retaining device is provided for use with a core drill bit, which is adapted to cut a core from a material such as concrete. The core retaining device includes a core attachment mechanism for releasably connecting the core retaining device to the core. A bearing is connected to the core attachment mechanism and allows the drill bit to rotate while the core attachment mechanism remains statically connected to the core. A biasing arrangement operably connects between the drill bit and the core via the bearing, and axially biases the core away from the material preventing the core from slipping from the drill bit. The core retaining device further includes at least one auxiliary safety feature such as extensions which extend laterally outward from the drill bit.

Abstract: A core drilling system is disclosed herein in which a torque tube has a groove or keyway which receives a rotating wheel or key to prevent a transmission box and motor from rotating during drilling operation. As such, the operator does not need to hold a stabilizing arm to resist counter rotational forces during the drilling process. The operator may focus on the hole to be cut in a substrate. Additionally, a torque tube stabilizing leg assembly may be secured to the free distal end portion of the torque tube.

Abstract: An example coring tool includes a cylindrical body having a leading edge to contact a substance and a cavity defined at least in part by an inner surface of the cylindrical body. The inner surface is to engage and retain a sample from the substance with a plurality of raised features. The raised features are shaped so that at least one of the raised features or an exterior surface of a sample in the cavity deforms to increase a force required to remove the sample from the cavity.

Abstract: An apparatus for transporting core samples includes an outer tube having an open end and a cover removably mounted to the open end; a core tube slidable into and out of the outer tube when the cover is removed from the outer tube; and a supporting structure between the core tube and the outer tube. The supporting structure supports the core tube within the outer tube with the core tube spaced from contact with an inner wall of the outer tube.

Abstract: An apparatus comprising a sidewall coring tool configured to obtain a plurality of sidewall formation cores from a sidewall of a wellbore extending into a subterranean formation, wherein the sidewall coring tool comprises a core catching tube configured to store the plurality of sidewall formation cores therein, wherein the core catching tube comprises a fluid port configured to allow evacuation of fluid from the core catching tube as each of the plurality of sidewall formation cores is introduced therein, and wherein the core catching tube, including the fluid port, is configured to be sealed downhole without removing the sidewall coring tool from the wellbore.

Abstract: A coring apparatus including an outer core barrel associated with a drill bit; an inner core barrel adapted to accept a core sample; and at least one strain sensor adapted to measure strain experienced by the inner core barrel selected from the group consisting of tension and compression, wherein an output of the at least one strain sensor is indicative of entry of the core sample into the inner core barrel.

Abstract: A coring apparatus includes an outer core barrel associated with a drill bit and an inner core barrel adapted to accept a core sample. The inner core barrel is rotatable with respect to the outer core barrel via a rotatable bearing. The coring apparatus may include a rotation sensor located within the inner core barrel. The rotation sensor measures relative rotation between the inner core barrel and the outer core barrel. Alternatively the coring apparatus may include one or more strain sensors adapted to measure tension and/or compression experienced by the inner core barrel or a vibration sensor mounted on the inner core barrel. The vibration sensor measures vibration experienced by the inner barrel.

Abstract: An apparatus comprising a sidewall coring tool configured to obtain a plurality of sidewall formation cores from a sidewall of a wellbore extending into a subterranean formation, wherein the sidewall coring tool comprises a core catching tube configured to store the plurality of sidewall formation cores therein, wherein the core catching tube comprises a fluid port configured to allow evacuation of fluid from the core catching tube as each of the plurality of sidewall formation cores is introduced therein, and wherein the core catching tube, including the fluid port, is configured to be sealed downhole without removing the sidewall coring tool from the wellbore.

Abstract: The present invention relates to a core catcher and a corer having the same, and more particularly, to a core catcher provided with dual blade radial pins for preventing loss of sediments and a corer having the same.

Abstract: A system is described which enables the safe release of formation gases when corebarrel is being raised. A corebarrel has an elongate cylindrical outer casing (1) and an elongate cylindrical liner (2), the liner (2) being disposed within the outer casing (1) such that there is a space (3) between the liner and the outer casing. The liner (2) has a plurality of unidirectional valves (4) which enable the passage of gas from the volume (5) within the liner (2) to the space (3) between the liner and outer casing, and prevent the passage of fluids from the space (3) to the volume (5).

Abstract: The longitudinal position of an inner barrel within a core barrel assembly can be adjusted and locked in the field without necessitating the disassembly of the cartridge cap assembly within the core barrel tool, and therefore without entailing loss of expensive rig time. The inner tube is coupled through a swivel assembly to a cartridge cap. The cartridge cap is threadedly coupled to the coring tool, and in particular to the outer tube. Thus, the cartridge cap is arranged and configured to be rotated, and thus longitudinally adjusted with respect to the outer tube. An upper portion of the cartridge cap is provided with a plurality of radially expanding fingers. A jam nut is disposed within a cylindrical array formed by the fingers, and is threadably engaged with the inside surface of the fingers.

Abstract: A core barrel flushing device and method is disclosed particularly for flushing drilling fluid, mud and other undesirable material from a pressure core barrel downhole at existing conditions and pressure.The flushing device (F) comprises an outer barrel attachable to the drill string and core barrel (10), and an inner barrel (90) within the outer barrel (70). A sealed chamber (C) within the outer barrel (70) contains a piston (114) and flushing medium (M) displacable from the chamber (C) and into the core barrel during forceful displacement of the piston following actuation of the flushing device.Actuation of the flushing device is initiated by means (B) passed down the drill string into engagement with actuating means (94) allowing displacement of the piston and flushing medium from the chamber into the core barrel.Tripping means (112) are also disclosed responsive to the final movement of the piston to actuate, and seal the flushed pressure core barrel (10) and core sample (51) therein downhole.

Abstract: In a hollow stem auger for earth boring of the kind having spring loaded valve members at the bottom of the stem to permit the passage of test implements such as corers and vane test implements, the auger bit is constructed with a cage formation enclosing the valve member and supporting a bottom ring carrying cutting teeth. Interference of the valve members with a test implement is prevented by using an uncoupleable cylindrical sleeve surrounding the implement which sleeve can be lodged between the valve members to hold them open during use of the implement.

Abstract: Coring apparatus for obtaining core samples which may comprise: an outer barrel assembly, the lower end of which is adapted for connection to a core bit, the upper end of which is adapted for connection to a drill string; an inner barrel assembly concentrically disposed within the outer barrel assembly and having first and second axially spaced and fluid communicating chambers therein; and valve means carried by the inner barrel assembly and movable from an open position, in which a core sample may be received by the first chamber, to a closed position, sealingly enclosing the core sample within the first chamber.