Tubing plunger

Abstract

The invention discloses an oil pipe plunger which comprises a fishing head and one or more plunger joints. The ends of every two adjacent plunger joints are hinged to form a plunger joint string; and the fishing head is connected to one ends of the plunger joint strings. The maximum diameter of the fishing head is smaller than or equal to the maximum outer diameter of each plunger joint body. The outer wall of each plunger joint is sleeved with at least one roller shaft ring, and the outer diameters of all the roller shaft rings are larger than the maximum diameter of each plunger joint body. By means of the oil pipe plunger, the roller shaft rings are arranged on the outer wall of the oil pipe plunger, and the roller shaft rings make contact with the inner wall of an oil well pipe, so that original sliding friction between the outer wall of the plunger and the inner wall of the oil pipe is transformed into rolling friction, so that the problems that in the prior art, a plunger repeatedly passes through a bending position when working in an oil well, and sliding friction and abrasion between the plunger and the inner wall of an oil pipe in the position are serious are effectively solved. The oil pipe plunger is simple in structure, convenient to use and long in service life, and the risks of oil and water leaking due to oil pipe abrasion and fracture are reduced.

Description

technical field [0001] The invention relates to an oil extraction equipment, in particular to an oil pipe plunger. Background technique [0002] In oil and gas exploitation, plungers are widely used to move up and down in oil wells to discharge accumulated water in wells. Because directional wells are curved, serious dogleg degrees restrict the ability of plungers to pass through wells. The Chinese patent with publication number CN202531390U discloses a Gas well drainage and gas production plunger, the plunger includes several successively hinged plunger sections, so that the plunger can be bent to pass through the curved part of the tubing in the directional well. [0003] However, the plunger has the following problems. When the plunger passes through the curved part of the oil pipe in the directional well, it always closely fits the inner wall of the oil pipe on the outer side of the bend of the oil pipe, increasing the sliding friction at this place. When the plunger wor...

AI Technical Summary

Problems solved by technology

[0003] However, the plunger has the following problems. When the plunger passes through the curved part of the oil pipe in the directional well, it always closely fits the inner wall of the oil pipe on the outer side of the bend of the oil pipe, increasing the sliding friction force at this place. When the plunger works in the oil well, Repeatedly passing through this bend, the sliding friction between the plunger and the inner wall of the oil pipe at this place is seriously worn

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