RU2307228C2 - Sucker rod coupler - Google Patents

Abstract

FIELD: oil production industry, particularly means to protect production string and sucker rods against wear caused by friction.

SUBSTANCE: coupler comprises upper half-coupling, ball finger and lower half-coupling. Lower half-coupling is installed on cylindrical threaded ball finger part. Upper half-coupling is connected to lower one through case. Ball finger is arranged in lower case part and installed on inner spherical surface thereof. Lower half-coupling is fixed with figured nut having spherical inner surface and with threaded lock nut. Coupling has protective antiwear washer. Antowear washer, end surface of upper half-coupling and inner spherical case surface define cavity filled with consistent black-lead grease.

EFFECT: increased efficiency of coupler usage in wells characterized by abnormal geological-and-technical operating conditions.

1 dwg

Description

The invention relates to the oil industry, in particular to the protection of tubing, tubing and rod couplings from wear due to friction against each other.

A known coupling of sucker rods to reduce wear of downhole equipment and including guide sleeves worn on the body of the rods made of polymeric materials (1) (see Urazakov K.R. and other oilfield equipment for well wells. - M .: LLC " Nedra-Business Center ”, 1999, p. 268, pp. 125-126).

A disadvantage of the known device is its low efficiency under conditions of severe curvature of the wellbore of the producing wells and mainly solves the problem of protection against tar-paraffin deposits. The closest in technical essence of the invention is the connecting sleeve of the sucker rods, consisting of a composite housing interconnected by a swivel, made in the form of a half coupling and a ball pin, the connection of the lower part of the body with a ball pin is made on spherical surfaces with a gap adjustable by a latch (see RF Patent No. 2211909 17/05).

A disadvantage of the known device is the possibility of jamming and breaking off the ball finger in its cylindrical part in places of maximum bending loads and the presence of torque (complex stress state), as well as the complexity of the execution technology, since it is necessary to strictly fulfill the conditions for the manufacture of moving parts of the joint (unity of the geometric center).

In addition, during the operation of rod columns in wells with a significant removal of abrasive particles from the formation and high chemical aggressiveness of the elevated product, they enter the upper part of the body, causing significant abrasive and corrosive wear (crevice corrosion) of the spherical surface of the finger and the body. All this reduces the efficiency of the device in deep wells with complex geological and technical operating conditions.

The aim of the invention is to increase the efficiency of the device coupling couplings for sucker rods in wells with complicated geological and technical conditions of operation (significant curvature and depth, high salinity and water content of the elevated product, the content of mechanical and abrasive particles carried out from the reservoir and sump wells, etc. )

The technical result is achieved in that the coupling for the sucker rods contains an upper coupling half, a ball pin and a lower coupling half mounted on a cylindrical threaded part of the ball pin, the upper coupling half is connected to the lower one by means of a housing, in the lower part of which a ball pin is mounted on its inner spherical surface, and the lower coupling half is fixed with a nut with a spherical inner surface and a locking threaded nut, while the coupling is equipped with a protective antifriction washer, otorrhea with the end surface of the upper half of the coupling and the inner spherical surface of the housing defines a cavity filled with graphite grease lubrication.

The drawing shows a coupling for connecting sucker rods.

A coupling for sucker rods, located between the sucker rods 1 and 2, contains an upper coupling half 3, screwed to the housing 4, in the lower part of which a ball pin 5 is mounted, on the threaded part of which there is a lower coupling half 6, a locking threaded nut 7, a nut with a spherical the inner surface 8 and the protective, anti-friction washer 9. Formed by the washer 9, the inner spherical surface of the housing 4 and the end surface of the sleeve 3, the cavity A is filled with graphite grease during assembly.

The device operates as follows.

When bending forces occur in the sections of the borehole bore, the movable sleeve 6 is shifted relative to the body 4 and the upper coupling half 3, centering the rod string in the tubing string, thereby relieving stresses in the body of the rods and tubing tubing, preventing their wear and turning of the tubing string pipes in intensely bent wells.

Information sources

1. Urazakov K.R. and other oilfield equipment for cluster wells. - M .: Nedra-Business Center LLC, 1999, p. 268, pp. 125-126.

2. RF patent No. 2211909 17/05.

Claims (1)

A coupling for sucker rods comprising an upper coupling half, a ball pin and a lower coupling half mounted on a cylindrical threaded portion of a ball pin, characterized in that the upper coupling half is connected to the lower one by means of a housing, in the lower part of which a ball pin is mounted on its inner spherical surface, and the lower coupling half is fixed with a nut with a spherical inner surface and a locking threaded nut, while the coupling is equipped with a protective antifriction washer, which has an end face overhnostyu upper half of the coupling and the inner spherical surface of the housing defines a cavity filled with graphite grease lubrication.