Abstract: Systems, apparatus and methods useful for increasing the outer diameter of a tool string at a desired location in the tool string involve a spacer tool having a mandrel releasably engageable with at least one other tool of the tool string and a gauge ring distinct from and releasably, non-threadably engageable with the mandrel. The gauge ring extends radially outwardly from the mandrel to provide the spacer tool with a maximum outer diameter that is greater than the maximum outer diameter of at least one other tool in the tool string.

Abstract: A centralizer for stabilizing fluid flow through a hollow shaft has a body with an axis, an outer surface and a circumference. Fins extend from the outer surface and include a first pair of fins that are axially aligned with each other and circumferentially spaced from each other. A second pair of fins are axially spaced a first distance from the first pair of fins. The second pair of fins are axially aligned with each other and circumferentially spaced from each other. The first and second pairs of fins are circumferentially offset from each other.

Abstract: Embodiments of the present invention disclose a standoff assembly for a sucker rod used for sucker rod pumps. The assembly includes an annulus body, a hole that passes through the annulus body, the hole configured to permit a sucker rod to translate through the hole, a sliding material component located along the surface of the hole, and a temporary component; wherein upon elimination of the temporary component, the sliding material component interacts with the sucker rod to reduce sliding friction as the sucker rod translates through the assembly.

Abstract: A wireline standoff that may ameliorate the effects of wireline cable differential sticking, wireline cable key seating, and high cable drags by reducing or eliminating contact of the wireline cable with the borehole wall during the logging operation. An embodiment includes a wireline standoff. The wireline standoff may comprise a pair of opposing assemblies. The opposing assemblies may each comprise a half shell, a cable insert configured to be disposed in the half shell, and external fins coupled to the half shell. The wireline standoff may further comprise one or more fasteners configured to couple the opposing assemblies to one another.

Abstract: A sucker rod guide having low friction and high wear resistance is disclosed herein, along with a fluid extraction system comprising the same. At least a part of the exterior surface of the sucker rod guide is formed from a cold worked and spinodally-hardenable or spinodally-hardened copper alloy comprising from about 5 to about 20 wt % nickel, and from about 5 to about 10 wt % tin, the remaining balance being copper, and having a 0.2% offset yield strength of at least 75 ksi. The guide includes a smoothbore adapted to surround and engage the surface of a sucker rod. The exterior surface of the guide can include grooves miming between the two ends. In particular embodiments, the guide is made by joining together two identical guide segments. In other embodiments, the guide is a single integral piece molded around a sucker rod.

Abstract: A cleaning apparatus includes a cable with spacers along the length of the cable for insertion into a tube with bends. Each of the spacers have a sphere-like body and have a diameter that is approximately the same as an inner diameter of the tube. Each neighboring pair of spacers are spaced apart from each other at approximately the same distance as the inner diameter of the tube. The cleaning apparatus is suited for passing through tubing within cracking furnaces and heat exchangers, which typically have many U-bends.

Abstract: A cold worked and spinodally-hardened copper alloy comprising from about 8 to about 20 wt % nickel, and from about 5 to about 11 wt % tin, the remaining balance being copper, and having a 0.2% offset yield strength of at least 75 ksi, is used to form a sucker rod coupling or subcoupling. Each coupling is formed from a core having two ends, each end having an internal thread. These box ends engage the pin of a sucker rod or other rod. The exterior surface of the core includes grooves running between the two ends.

Abstract: An embodiment includes a wireline standoff that may ameliorate the effects of wireline cable differential sticking, wireline cable key seating, and high cable drags by reducing or eliminating contact of the wireline cable with the borehole wall during the logging operation. An embodiment includes a wireline standoff. The wireline standoff may comprise a pair of opposing assemblies. The opposing assemblies may each comprise a half shell, a cable insert configured to be disposed in the half shell, and external fins coupled to the half shell. The wireline standoff may further comprise one or more fasteners configured to couple the opposing assemblies to one another.

Abstract: A sucker rod string improved by the use of wear resistant, high temperature resistant, fiber-reinforced phenolic composite materials as centralizing guides on sucker rods and couplings, both molded on the rod and prepared as snap-on couplings for in-the-field use, and on magnet rod inserts, both rod box and pin magnet rod inserts, in which the thermosetting composites are used as sleeves, encapsulating housings, and centralizing guides. The magnet rod inserts and couplings are designed to be machined so that worn phenolic composite can be removed and replaced with fresh composite without removing or damaging the magnet. Processes are disclosed for integrating composite thermoset molding into sucker rod, coupling, and magnet rod insert manufacture and for refurbishing used components of a sucker rod string.

Abstract: A sucker rod for use in oil well production and a method for making the sucker rod are disclosed. The sucker rod comprises two end portions and a rod body between the two end portions. Each end portion comprises an end section, a shoulder section, a tool engagement section and a tapered enlargement section. The shoulder section, the tool engagement section and the tapered enlargement section are coated by an alloy coating (such as a corrosion-resistant Ni-based alloy). The rod body is coated by a non-metal coating (such as a corrosion-resistant polymer coating).

Abstract: A method of fabricating a centralizer for a tubular body in a wellbore is provided herein. The method includes providing a centralizer, wherein the centralizer include an elongated body having an inner surface and an outer surface, and wherein the inner surface defines a bore there through. The bore is dimensioned to slidingly receive a tubular body. The method also includes applying a first low-coefficient of friction treatment to the inner surface and the outer surface using a ferritic nitro-carburizing process. The method further includes depositing a second low-coefficient of friction treatment onto at least the inner surface. The coatings are designed to provide a reduced coefficient of friction on the surfaces.

Abstract: A coupling assembly is disclosed for connecting and centralizing a first threaded-end member and a second threaded-end member, the coupling assembly comprising: a mandrel having a rotor receiving surface bounded by a first stop and a second stop, the mandrel having a first threaded pin at a first end for connection to a first threaded box coupling for the first threaded-end member, and a second threaded pin at a second end for connection to a second threaded box coupling for the second threaded-end member; each of the first stop and the second stop having respective outer diameters and the respective outer diameters being less than or equal to the respective outer diameters of the first threaded box coupling and the second respective box coupling; and a rotor with raised fins mounted on the rotor receiving surface between the first stop and the second stop.

Abstract: A tool which connects the last sucker rod of a sucker rod string to a downhole pump has a circularly cylindrical cylinder and piston so that the piston slides reciprocally and rotates freely within the cylinder. However, the closed upper end of the cylinder and the upper face of the piston have a cooperable tongue and groove which prevent relative rotational motion of the piston in the cylinder when the tongue is engaged in the groove so that the tool can be disconnected from the pump in response to rotation of the string at the uppermost stroke of the plunger to engage and turn the tongue and groove.

Abstract: A stator for a progressive cavity pump comprises a stator housing having a central axis, a first end, and a second end opposite the first end. In addition, the stator comprises a stator liner disposed within the stator housing. The stator liner has a first end and a second end opposite the first end. The first end of the stator liner is axially spaced from the first end of the stator housing. Further, the stator comprises a tag insert positioned in the stator housing between the first end of the stator housing and the first end of the stator liner. The tag insert has a through passage defining a radially inner surface that includes a tag shoulder.

Abstract: A multi-tasking downhole rod guide for centralizing a downhole pump rod production tubing within production tubing, while simultaneously reducing abrasion and deterioration of the production tubing and engendering auxiliary pump-boosting functions. The rod guide is configured with an elongate helix having a continuous trough-like channel through which hydrocarbons flow upwardly under high pressure. As the pressurized hydrocarbons flow through a succession of plates at each equidistant helical level, the elongate helix rotates synchronously with the upwardly flowing hydrocarbons within the production tubing string.

Abstract: A backspin retarder for a progressive cavity pump deploys on the drive string uphole from a pump unit. The backspin retarder has a shaft that connects to portions of the drive string. An impeller disposes on the shaft and can move axially and radially. In an unengaged condition, the impeller and shaft can rotate relative to one another so the drive string can rotate in a drive direction without impediment from the impeller. In an engaged condition, the impeller rotates with the shaft in a backspin direction. In this way, vanes on the impeller can retard the backspin of the shaft and drive string by attempting to force the lifted fluid column flowing downhole past the impeller back uphole. The retarder can use a pin and slot arrangement or an arrangement of engageable teeth to engage the impeller to the rotation of the shaft.

Abstract: An apparatus for downhole operation. The apparatus comprising a support body having a surface located in a borehole and a coating on an at least a portion of the surface of the support body. The coating is an inert material selected for reducing friction and corrosion.

Abstract: A sucker rod coupling features a coupler unit having internally threaded coupling sections at opposite ends for engaging sucker rod pins and one or two outer members extending about the coupler unit between the ends, each outer member being rotatable about the coupler unit and presenting contact surfaces facing outwardly at positions radially outward therefrom. Each outer member is positioned between a respective end of the coupler and a stop defining feature thereof, and a respective stop element is selectively deployable adjacent the respective end of the coupler on a side of the outer member opposite the stop-defining feature. The outer member prevents wear to the production tubing and the sucker rod string, is easily replaceable through manipulation of the stop element to allow sliding of the member off the unit and sliding of a new member thereon, and directly engages the sucker rods without needing additional threaded components.

Abstract: A multi-tasking downhole rod guide for centralizing a downhole pump rod production tubing within production tubing, while simultaneously reducing abrasion and deterioration of the production tubing and engendering auxiliary pump-boosting functions—with minimal energy consumption. The rod guide is configured with an elongate helix having a continuous trough-like channel through hydrocarbons flow upwardly under high pressure. As the pressurized hydrocarbons flow through a succession of plates at each equidistant helical level, the elongate helix rotates synchronously with the upwardly flowing hydrocarbons within the production tubing string. A multi-tasking downhole rod guide for centralizing downhole production tubing within a well casing, while simultaneously reducing abrasion and deterioration of the tubing and engendering auxiliary pump-boosting functions—with minimal energy consumption.

Abstract: The apparatus for evaluating a wellbore while drilling includes a logging toolheld on a drill string and is adapted to obtain data from the wellbore while moving the drill string including the logging tool uphole and out of the wellbore. The logging tool includes a memory for storing obtained data and an on-board power supply battery. A computer being positioned at a surface level of the wellbore is adapted to obtain the data from the memory when the logging tool is also positioned at the surface level. The logging tool is adapted to perform a minimum power-consuming sleep mode with a data obtaining and storing function being disabled and the computer is adapted to transmit a wake-up signal downhole to enable the data obtaining and storing function of the logging tool just prior to tripping out the drill string from the wellbore. The wake-up signal preferably is a mud pulse signal sent through the drilling fluid used when drilling the wellbore.

Abstract: A centralizer for tubular elements is provided which includes an inner part formed by a first material having high mechanical performance and chemical stability and an outer part arranged on said inner part, formed by a second material. The second material may be an autolubricating material. The second material may further possess a low coefficient of friction. The second material may additionally possess lower mechanical performance and chemical stability than the first material. A method of manufacturing the centralizer is also provided, including steps of injecting the first material on a tubular element to form the inner part on the tubular element and injecting the second material to form the outer part on the formed inner part.

Abstract: There is disclosed an improved tool, e.g. adapted to comprise at least part of a well completion assembly or well drilling assembly. The invention provides an improved downhole tool (or device) having a friction factor of the order of ten times less than those known from the prior art, e.g. of the order of 0.100 or less. Accordingly the invention provides a downhole tool (10; 10a; 10b; 10c; 10d), at least part of the downhole tool or device being made from Tungsten Disulphide (Tungsten Disulfide). In a disclosed embodiment the at least part comprises at least one surface of the downhole tool, the at least one surface comprising a bearing surface, e.g. a journal bearing surface and/or a thrust bearing surface.

Abstract: A rod guide is provided for use in a rotating rod string (12) for powering a progressive cavity pump (14) for pumping downhole fluids through tubing (16) to the surface. The rod guide includes a rotor sleeve (20) secured to the rod string. The rotor sleeve includes a plurality of axially spaced reduced diameter body portions 22, and a plurality of axially spaced enlarged diameter ridge portions 24. Upper and lower stop surfaces 26, 28 on the ridge portions permit axial movement of the stator sleeve with respect to the rotor sleeve. A stator sleeve (40) positioned over the rotor sleeve, and has a sleeve body (42) with a generally circular configuration with opposing circumferential ends (44, 46) spreadable to position the stator sleeve about the rotor sleeve. A plurality of ribs (48) extend outward from the stator sleeve body.

Abstract: A rod guide is provided for use in a rotating rod string (12) for powering a progressive cavity pump (14) for pumping downhole fluids through tubing (16) to the surface. The rod guide includes a rotor sleeve (20) secured to the rod string and having a plurality of circumferentially spaced exterior surfaces (22) each positioned substantially along an exterior of a cylinder. The rotor sleeve also includes one or more stop surfaces (24) for limiting axial movement of a stator sleeve (40) with respect to the rotor sleeve, and two or more axially extending cavities (26) each extending from a bottommost surface to an opposing uppermost surface of the rotor sleeve and passing through the one or more stop surfaces. Stator sleeve (40) surrounds the rotor sleeve and has an interior surface (42) for engaging the plurality of circumferentially spaced exterior surfaces of the rotor sleeve, and a plurality of ribs (44) extending outward from two or more outer cylindrical surface portions (44) of the stator sleeve.

Abstract: A polish rod clamp apparatus has a body defining a lower rod aperture and a tapered body recess. A cap defines an upper rod aperture and a tapered cap recess. Tapered gripper dies have upper and lower outer surfaces sloping inward from a central portion and inner surfaces configured to bear against the polish rod. The dies are installed in the body recess such that inner surfaces bear against a polish rod and the lower outer surfaces bear against walls of the body recess. The dies are movable with respect to the body and are prevented from rotating. The cap is threaded onto the body such that the upper outer surfaces of the gripper dies bear against the walls of the tapered cap recess. Threading the cap onto the body forces the gripper dies against the outer surface of the polish rod passing through the body.

Abstract: A rod guide is provided for use in a rotating rod string (12) for powering a progressive cavity pump (14) for pumping downhole fluids through tubing (16) to the surface. The rod guide includes a rotor sleeve (20) secured to the rod string and having a plurality of circumferentially spaced exterior surfaces (22) each positioned substantially along an exterior of a cylinder. The rotor sleeve also includes one or more stop surfaces (24) for limiting axial movement of a stator sleeve (40) with respect to the rotor sleeve, and two or more axially extending cavities (26) each extending from a bottommost surface to an opposing uppermost surface of the rotor sleeve and passing through the one or more stop surfaces. Stator sleeve (40) surrounds the rotor sleeve and has an interior surface (42) for engaging the plurality of circumferentially spaced exterior surfaces of the rotor sleeve, and a plurality of ribs (44) extending outward from two or more outer cylindrical surface portions (44) of the stator sleeve.

Abstract: A field-installable rod guide for a rod moveable within an oilfield tubular having an interior tubular surface for driving a downhole pump to pump liquids to the surface through the oilfield tubular. The rod guide comprises a body including interfitting body members. An outer tapered surface on one body member is engaged by an inner taper-engagement surface on the other body member, to urge the body members toward a rod gripping position about the rod. The mechanism disclosed provides a particularly strong engagement with the rod, so that the rod guide may be used for either reciprocating or rotating rods. For rotating type rod guides, an outer sleeve may be included about the body.

Abstract: Improved sucker rod joints for down hole petroleum pumping applications are provided within the form factor of standard API sucker rods, such that existing inventory in suitable condition is fully usable in more demanding applications. The pin ends are selected or processed such as to provide preselected axial distance between a flat pin end and at least one reference surface, such as a threaded region or reference shoulder or both. The coupler is dimensioned such that the pin ends are in abutment either with each other or with opposite sides of an intervening torque washer in the central region, when the connection is made to a selected level of thread engagement. Furthermore, the engagement is such as to put the pin ends in compression and the coextensive length of coupler in tension. This increases frictional restraints and locks the elements together to resist fatigue failure upon cycling and to insure together with an anaerobic adhesive sealant, against back threading.

Abstract: A rod coupling formed of a tubular housing having a first box end and a second box end. The tubular housing has an interior surface defining a bore extending along the tubular housing from the first box end to the second box end, and has an exterior surface. Plural openings extending transversely through the housing from the interior surface to the exterior surface. A coating on the exterior surface of the tubular housing covers the plural openings, and may fill the openings or extend through the openings to form knobs inside the tubular housing. The coatings may taper from the exterior surface towards the interior surface. The openings are preferably distributed uniformly around the tubular housing. The openings are preferably distributed in plural rows. A rod string may be made up of plural such rod couplings and connecting rods.

Abstract: A centraliser primarily for use when casing an oil or gas well, the centraliser having low frictions coatings or sliders on the outer surface thereof.

Abstract: A limit clamp for securing a tool to a casing having a groove in its outer surface. The limit clamp comprises a block having a base and a flange. The base is positioned in the groove to contact at least one stop in the groove and the flange extends out of the groove. The limit clamp also comprise a lock ring encircling the block and the casing, wherein the lock ring engages the block.

Abstract: The present invention is for a drill string stabiliser tool (18) used in borehole drilling. The tool includes a symmetrical body (20) with a plurality of external recesses (22). The recesses (22) have internal opposite surfaces (23) which converge inwardly from the outer surface of the body. A pad assembly (24) is disposed in each recess (22) and includes a wedge block (28) with converging radially inwardly opposite side surface (29) complementarily abutting said recess surfaces. Each wedge block (28) has a bolt (30) securing said wedge block (28) to said body (20) and is slightly larger dimensioned than the recess (22). The angles of the wedge blocks and the recesses are so chosen to effect an interference fit so that when the wedge block (28) is forced into the recess (22) by use of the bolt (30) it is held there by an interference fit.

Abstract: A combined guide and automatic rod rotator device for a downhole sucker rod which is reciprocating axially. The sucker rod is connected with a swivel mechanism to allow rotational movement of the sucker rod. The combined guide and automatic rod rotator device includes a cylindrical body and at least two vanes extending radially from the cylindrical body, wherein the vanes are helically arranged on the body.

Abstract: A stuffing box support assembly is configured to be positioned between a production pumping tree and a stuffing box of a wellhead. In use, the support assembly functions like a joint between the wellhead production tree and the stuffing box. The support assembly is configured such that it could tilt or move laterally to maintain a coaxial relationship between the stuffing box and a polished rod extending therethrough. This alignment between the stuffing box and the polished rod reduces wear and tear of the stuffing box packing.

Abstract: An apparatus for reducing abrasive wear within a housing that includes a body having at least one protrusion selectively positioned and extending outwardly from the outer surface thereof, the body being placed concentrically within the housing and rubbing against the inside surface thereof as the body is moved within the housing. The body is provided with a plurality of slides residing in a like number of grooves formed on the outside surface thereof, each of the slides having a groove formed in at least one side surface thereof The slides are affixed to the body by deforming the material comprising the body into the groove formed in the slide by striking the surface of the material comprising the body adjacent the groove in which the slide resides with enough force to deform the material comprising the body into the groove formed in the side surface of the slide. The apparatus is particularly effective for use with the sucker rod of a pump jack for a subterranean petroleum well.

Abstract: A tubing centralizer for borehole drilling disclosed. The centralizer includes a retaining collar and an outer sleeve. In a method for installing the centralizer onto a joint of tubing, the retaining collar is mounted onto the joint of tubing and the outer sleeve is installed thereover.

Abstract: An apparatus for reducing abrasive wear within a housing that includes a body having at least one protrusion selectively positioned and extending outwardly from the outer surface thereof, the body being placed concentrically within the housing and rubbing against the inside surface thereof as the body is moved within the housing. The body is provided with a plurality of slides residing in a like number of grooves formed on the outside surface thereof, each of the slides having a groove formed in at least one side surface thereof The slides are affixed to the body by deforming the material comprising the body into the groove formed in the slide by striking the surface of the material comprising the body adjacent the groove in which the slide resides with enough force to deform the material comprising the body into the groove formed in the side surface of the slide. The apparatus is particularly effective for use with the sucker rod of a pump jack for a subterranean petroleum well.