Novel plunger applicable to sand-producing fluid-producing gas well plunger lifting techniques

Abstract

The invention discloses a novel plunger applicable to sand-producing fluid-producing gas well plunger lifting techniques. The novel plunger comprises a fishing head 1, a sand scraping structure 2, a seal structure 3, a sand discharge structure 4 and a spiral structure 5 sequentially from top to bottom. The fishing head is arranged at the top. The sand scraping structure is arranged on the upper portion and is in a structure of a cone frustum and a cylinder; the surface of the sand scraping structure is provided with scraping grooves 6. The seal structure is arranged in the middle and is in a two-layer combined structure; a steel rod is arranged inside the seal structure; the surface of the seal structure is made of nylon wear-resistant material and provided with 11 grooves 7; a protrusion is arranged between each two grooves. The sand discharge structure is arranged on the lower portion and is in a cylindrical structure; the surface of the sand discharge structure is provided with sand discharge grooves 10. The spiral structure is arranged at the bottom; the surface of the spiral structure is provided variable pitch spiral blades 11. A principle of the novel plunger is reliable; the novel plunger is reasonable in structure; after the novel plunger is arranged in an oil tube, the problems that plunger sand jamming or unsmooth operation or the like in the lifting, drainage and gas production process are solved, and the defects of the prior art are overcome.

Description

technical field [0001] The invention relates to a novel plunger suitable for sand producing liquid gas wells, which can better solve the problems of sand stuck or poor operation of the plunger in oil pipes, and belongs to the technical field of oil and natural gas production. Background technique [0002] In the process of gas reservoir development, as the formation energy gradually decreases, the gas production rate gradually decreases, and irreducible water and edge water or bottom water enter the wellbore. Due to the large difference in gas-liquid physical properties, the loss of liquid slippage is serious during the process of gas-liquid rising. A large number of retreats increased the back pressure at the bottom of the well, reduced the production pressure difference in the formation, and caused a decline in the production of gas wells. The plunger is a drainage and gas production tool that is lowered in the oil pipe, and its outer diameter is slightly smaller than the ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new plunger suitable for the plunger lifting process of sand producing liquid gas wells. The plunger is reliable in principle and reasonable in structure. Problems such as sand stuck or poor operation overcome the defects and deficiencies of the prior art

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