Highly-deviated well and horizontal well plunger gas lift system

Abstract

The invention discloses a special system for highly-deviated well and horizontal well plunger gas lift. The special system comprises a tubing shoe with a plunger buffering function and a lengthened bendable plunger, wherein the tubing shoe with the plunger buffering function comprises a tubing shoe body and a damping spring, the upper portion of the tubing shoe body is connected with a tubing through an internal thread, the inner wall of the tubing shoe body and the lower end face of the tubing form an upper step surface, a lower step surface is arranged on the lower portion of the tubing shoebody, the damping spring is clamped between the upper step surface and the lower step surface, the lengthened bendable plunger comprises a fishing head, two turbulent seal plungers, a spring and a brush, the special tubing shoe is tripped into a highly-deviated well section or a horizontal section together with the tubing, and the problem of difficulty in feeding an existing plunger clamping device into the highly-deviated well section. The lengthened bendable plunger cannot be limited by a well bore configuration, influence caused by inconsistency of drift diameters of a Christmas tree and the tubing can be reduced by lengthening the plunger, and the plunger has better lost circulation prevention and gas channeling prevention effects as compared with a conventional plunger.

Description

technical field [0001] The invention relates to the field of gas well drainage and gas recovery, in particular to a plunger gas lift system for a horizontal well / highly inclined well, and belongs to the field of petroleum and natural gas exploitation. Background technique [0002] The plunger gas lift drainage gas recovery process has the advantages of simple equipment, economy, environmental protection and high efficiency, and is widely used in the production of water-producing gas wells. The principle is to use the solid interface to separate the effluent and gas, reduce the slippage effect between gas and liquid, reduce the drop of liquid, and improve the efficiency of liquid drainage; however, when the plunger gas lift technology is applied to horizontal wells / highly deviated wells, it faces the following problems : Affected by the well inclination, the existing plunger retainer is difficult to send into the highly deviated well section, and the shock setting force is no...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a special tubing shoe for the plunger gas lift of the horizontal well / highly inclined well, which solves the problem that the existing plunger retainer is difficult to send and release into the highly inclined well section; reduces the plunger stuck in the horizontal well / highly inclined well , improve the sealing effect of the plunger and improve the efficiency of liquid discharge

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