A sucker rod guide for attachment to a sucker rod or the like has a body comprising a circumferential edge at each end, wherein one or both of the circumferential edges is non-linear. The shape of the non-linear circumferential edge can be symmetrically varying, asymmetrically varying, sinusoidal, castellated or stepped, undulating or randomly or pseudo-randomly profiled, to produce a turbulence stabilization effect. At least a portion of the body of the sucker rod guide, and in particular, a region around one or both of the non-linear circumferential edges comprises a textured surface or a surface structure.

The present invention relates to a plug and valve integrated cone valve pump with combined type movable and fixed three cylinders and two spiral centralizers, which is applied to suction working conditions in highly deviated well sections. It comprises three pump cylinders, which are combined type including two fixed cylinders and a dynamic cylinder, two centralizers, which are combined type including a dynamic spiral centralizer and fixed spiral centralizer, a fixed cone valve, a cylinder and plug integrated springing fixed cone valve, a fixed plunger and a movable guide rod cone valve to solve the problems such as stuck pump, eccentric wear between plunger and pump cylinder and valve leakage.

A thread protector for use on a sucker rod or a drill pipe has a collet with a plurality of collet segments in which each of the plurality of collet segments has a protrusion adjacent an end thereof, and a sleeve overlying the collet and movable between a first position and a second position. The second position compresses the plurality of collet segments such that the protrusion engages with the thread relief of the sucker rod or drill pipe. This retains the sleeve and the plurality of collet segments over the threaded end of the pipe so as to protect the threaded end of the pipe. The sleeve is movable to the first position such that the protrusions of the plurality of collet segments release from the thread relief so as to allow the thread protector to be removed from the threaded end of the pipe.

A corrosion testing device comprising a coupon holder for a sucker rod of a pump system and at least one coupon for corrosion testing, wherein the coupon holder comprises a holder body having an outer body surface and an inner contact surface, which inner contact surface is placeable on an outer rod surface of the sucker rod and defines a longitudinal body axis of the holder body, the at least one coupon is attached to the holder body and positioned at the outer body surface and at a radial coupon distance from the longitudinal body axis, the outer body surface comprises at least one guiding surface part located at a radial surface distance from the longitudinal body axis, and the radial surface distance is larger than the radial coupon distance.

A centralising assembly for a downhole device in the mining or oil well field, a method of manufacture therefor and to a coupling device including a centralising device.

A roller coupling apparatus for securing rods and other threaded components together in a pumping system. The roller coupling apparatus can include a body with a plurality of radially-positioned wheels rotatably coupled to the body. The arrangement of the wheels can uniformly spread the rod load within the interior diameter of the tubing. The body can include flat outer surfaces to facilitate increased fluid flow capacity around the apparatus. In operation, the wheels contact and roll along the interior diameter of the tubing, preventing surface-to-surface wear of the coupling body exterior and tubing interior, thereby prolonging coupling and tubing life. In one embodiment, the wheels can include wear grooves that can indicate wear areas in the wellbore. In one embodiment, the body can include grooves to permit retrieval of the apparatus when needed. Multiple apparatuses can be utilized to form rod strings of various lengths.

Sucker rods include end fittings having an outer wedge portion proximate to an open end, an inner wedge portion proximate to a closed end, and an intermediate wedge portion between the outer and inner wedges. Each wedge includes a leading edge, a trailing edge, and an angle between the leading and trailing edges. The triangular configuration, length of the leading edge, the length of the trailing edge, and size of the angle in each wedge portion cause distribution of force, such that compressive forces distributed to the rod proximate the closed end exceed compressive forces distributed to the rod proximate the open end. An automated installation procedure installs the end fitting through the use of multiple chucks, positioned by servo motors along a fitting table.

A rod centralizer and solids control assembly can be mounted on a rod string. The assembly allows well fluid containing high solids to pass through the pump while eliminating the solids from being swept back into the pump barrel or accumulating in the tubing. The assembly can include a body portion coupled to a bristle positioned helically around the body portion. The bristle can be coupled to a piston, allowing the bristle to extend during upward fluid movement and retract when rod rotation stops. The bristle can trap solids, leaving the solids higher and away from a pump intake. This can allow the solids to be lifted out of the pump, preventing solids from collecting on a bottom portion of the pump or tubing. The assembly can include centralizer components that center the rod, preventing it from rubbing against the tubing. Multiple assemblies can be incorporated into the rod string.

A method for making a connection between an end of a first composite rod (10) and an end of a second composite rod (10) comprises removing material from an outer surface of the composite material surrounding optical fibre (11) adjacent an end of the first and second composite rods (10, 20) to form at least one shoulder on each of the first and second composite rods (10, 20); connecting the optical fibres (11) between the first and second composite rods (11); clamping the ends of the first and second composite rods within two clamp devices (40) such that the shoulders of the first and second composite rods (10, 20) engage with shoulders of the clamp devices (40); connecting the clamp devices (40); and bonding the first and second composite rods (10, 20) to the first and second clamp devices (40).

A submersible pump support rod stabilizing device includes: a submersible pump, an upper support rod, a lower support rod, etc. The upper part at the one side and the lower part at the other side of the submersible pump have upper support rods and lower support rods respectively, and the upper and lower support rods have bends towards the side of the submersible pump and a small section of the rod head. This small section of the rod head has a circular ring above it, the rod head has an inclined edge and a section of rope. The two ends are respectively fixed on the circular rings of the upper and lower support rod heads at the one side of submersible pump, the rope has wheels, and the other digging rope is hauled upward by the wheel and the other end of the digging rope is fixed at the wellhead.