CN201972628U - Antifriction device for hollow sucker rod - Google Patents

Abstract

An antifriction device for a hollow sucker rod comprises an upper joint, a rod body, a righting sleeve and a lower joint, wherein the upper joint, the rod body and the lower joint are sequentially connected, and the righting sleeve is sheathed on the rod body. The upper joint, the rod body and the lower joint are all hollow. The righting sleeve adopts a metal material whose hardness is lower than the hardness of an oil pipe. As the righting sleeve dose not move during the oil pumping, the righting sleeve is not subjected to friction on the inner surface of the rougher oil pipe to cause abrasion; as the surface of the rod body and the inner surface of the righting sleeve are smooth, the friction is not easily generated between the rod body and the righting sleeve although the rod body and the righting sleeve slide relatively; therefore, the antifriction device for a hollow sucker rod can ensure that the oil pipe and an oil pumping rod are not subjected to abrasion, and also achieves longer service life.

Description

The hollow rod anti-attrition device

Technical field

The utility model is the oil production equipment of petroleum industry, particularly a kind of hollow rod anti-attrition device.

Background technology

In sucker-rod pumping system, no matter be straight well or inclined shaft, R a T all is relative motion in contact, therefore, exist inevitable wearing and tearing between sucker rod and the oil pipe, particularly deep-well and inclined shaft, sucker rod is easy to bending in oil pipe, the problem of serious sucker rod partial wear oil pipe occurs, in order to solve the eccentric wear problem, worked out some technical methods and measure, but these technical measures all are to be applied on the solid sucker rod, also do not have suitable prevent mill technology and measure on the hollow rod, cause the oil well of hollow rod production wearing and tearing to occur producing between hollow rod and the oil pipe, after producing wearing and tearing oil pipe and hollow rod can not be used, cause the oil well operation, oil well repair free period is short, increase operating cost, increase rod tube consumption, the oil well off-time is many, has reduced crude output.

Summary of the invention

The purpose of this utility model is a kind of long service life of design, and the hollow rod anti-attrition device of the oil pipe that do not wear and tear again avoids hollow rod the problem of hollow rod, oil pipe eccentric wear to occur in the bending of oil pipe internal cause, inclination.

The purpose of this utility model is achieved in that by top connection, the body of rod, lower contact to be formed, top connection, the body of rod, lower contact connect successively, supporting positive cover is sleeved on the body of rod, and top connection, the body of rod, lower contact are hollow body, and supporting positive cover adopts hardness to be lower than the metal material of oil pipe hardness.

The beneficial effects of the utility model are: supporting positive cover does not move during owing to oil pumping, supporting positive cover can not rub on more coarse pipe inner surface and wear and tear, very smooth by body of rod surface and supporting positive cover inner surface again, though relative slip is arranged between them, also be not easy wearing and tearing, therefore, this hollow rod anti-attrition device can guarantee that oil pipe, sucker rod do not wear and tear, and can also guarantee to have higher application life.

Description of drawings

Fig. 1 is the utility model hollow rod anti-attrition device assembling drawing.

The specific embodiment

As shown in the figure, form by top connection (1), the body of rod (2), supporting positive cover 3, lower contact (4), top connection (1), the body of rod (2), lower contact (4) connect successively, supporting positive cover (3) is sleeved on the body of rod (2), top connection (1), the body of rod (2), lower contact (4) are hollow body, make it inside and outsidely can carry fluid respectively, also can be lowered to heating cable in inside, supporting positive cover (3) adopts hardness to be lower than the metal material of oil pipe hardness, as copper etc.

Claims (1)

1. hollow rod anti-attrition device, comprise top connection (1), the body of rod (2), lower contact (4), it is characterized in that: top connection (1), the body of rod (2), lower contact (4) connect successively, supporting positive cover (3) is sleeved on the body of rod (2), top connection (1), the body of rod (2), lower contact (4) are hollow body, and supporting positive cover (3) adopts hardness to be lower than the metal material of oil pipe hardness.

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