Leakage-proof and sand-blocking-proof drainage gas recovery plunger for high-inclination and sand-containing gas well

Abstract

The invention discloses a leakage-proof and sand-blocking-proof drainage gas recovery plunger for a high-inclination and sand-containing gas well, and relates to the field of gas well drainage gas recovery. The leakage-proof and sand-blocking-proof drainage gas recovery plunger comprises a fishing head, a plunger body, an air bag, a one-way valve, an embedded sand-proof block, an elastic leakage-proof ring, an elastic connecting section and other components. In the descending process of the plunger body, the internal air bag shrinks and deforms, accumulated water at the bottom of the well enters a hollow area in the plunger body, and temporary storage of water is achieved; in the ascending process of the plunger body, the internal air bag expands and deforms, the temporarily stored water is ejected out of capillary perforations of the plunger body, a moving liquid film is formed outside the plunger body, and liquid sealing is achieved; meanwhile, the situation that gravel deposits and solidifies at the sunken position of the plunger body is avoided; the elastic leakage-proof ring and a corrugated pipe are pressed and expand at the bent position, the annular area is reduced, and physical leakage prevention is achieved; double leakage-proof measures are achieved, the connecting position of the plunger body is connected through the corrugated pipe and a spring, and the flexibility degree of the plunger body passing through the bent position is improved; and meanwhile, the corrugated pipe protects the spring against sand blocking, the drainage efficiency is improved, and good application prospects are achieved.

Description

technical field [0001] The invention relates to the field of gas well drainage and gas recovery, in particular to a method for reducing liquid leakage when the plunger is lifted, depositing and solidifying sand and gravel on the surface of the plunger, and improving the efficiency of the plunger drainage and gas recovery in the case of a highly inclined gas well with severe leakage. tools. Background technique [0002] The plunger gas lift process is widely used in drainage gas recovery, which has the advantages of high efficiency, economy and environmental protection. At present, most gas-lift plungers are single-section plungers, which are not strong in sealing and leakage prevention, and have low applicability to highly deviated wells, and are prone to sand sticking and corrosion, resulting in increased wellbore friction and replacement of plunger damage Frequent problems, such as patent publication number CN106014346A, although the plunger gas lift can solve the problem...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of inflexible single-section plunger and easy blockage and serious leakage at the bend in the case of high-inclination and sand-bearing gas wells

In the process of wellbore flow, debris is easy to deposit at the groove of the plunger and the connection spring, resulting in the failure of the spring plunger, frequent replacement, and longer construction period.

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