A foam and plunger gas lift combined drainage and gas recovery method and device

Abstract

The invention provides a drainage gas recovery method and device of an air-lift combination of foam and plunger; a solid discharging bubble stick is embedded in to the plunger; the plunger is put intoan oil tube to work during producing; the plunger embedded with the solid discharging bubble stick is under the action of the gravity, the solid discharging bubble stick is fully contacted with hydrops located at shaft bottom through a passage, and foams are formed; the elastic compact foams are filled with the gap between the plunger and the wall of the oil tube all the time, and a gap between the plunger and a shaft is reduced, and liquid slipping and gas channeling are effectively reduced; compared with a conventional plunger, and the liquid lifting efficiency is further improved; and stable production of gas well less than 1000m3 is realized, and the recovery efficiency of gas field is further improved.

Description

technical field [0001] The invention belongs to the technical field of natural gas field development, and relates to a foam and plunger gas lift combined drainage and gas recovery method and device. Background technique [0002] With the development of gas fields, the production capacity of gas wells has been decreasing year by year. Some gas wells have entered the low-pressure and low-yield production stage. pressure, and limit its production capacity, which will eventually lead to water flooding and shutdown of gas wells, or even scrapping, resulting in huge economic losses. Drainage gas recovery is an effective method to solve wellbore fluid accumulation, and it is also an important measure to tap the production potential of water-bearing gas reservoirs and improve recovery, and is a key technology for stable production of gas fields. [0003] Plunger gas lift is a drainage gas recovery measure, and it is also a kind of intermittent gas lift; it is to put the plunger int...

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Problems solved by technology

[0004] The lower limit of the application of plunger gas lift technology at this stage is that the daily gas production is greater than 1000m 3 For gas wells with daily gas production less than 1000m 3 For gas wells with lower yields, since there is at least 1.25mm gap between the plunger and the tubing wall of the gas well, it will cause liquid leakage, and the application effect of conventional plungers is not good. It will cause flooding to stop production or even scrap

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