A method and device for gas recovery with plunger gas lift with velocity string and drainage

Abstract

The invention provides a drainage and gas production method and device through velocity string in cooperation with plunger airlift. Coiled tubing is adopted as the velocity string for drainage and gas production; when the coiled tubing is introduced, a buffer, an adaptor, a spherical one-way valve and a packer are subjected to preconnection in sequence, and the connection bodies are connected with the velocity string in a rolling connection mode; a continuous string coiled tubing unit introduces the coiled tubing into a shaft and makes the coiled tubing penetrate a downhole tool, before well opening for production, a nitrogen boost truck is adopted to knock out the packer at the bottom of the coiled tubing, the coiled tubing serves as a production tubular column, and velocity string drainage and gas production are conducted. By means of the method and device, the problem that accumulated liquid in the shaft cannot be thoroughly eliminated by adopting the velocity string drainage and gas production technology or the plunger airlift drainage and gas production technology independently and the problem of drainage and gas production during the whole life cycle from production to abandon of a gas well are solved, the method is simple, fast and convenient to implement and low in cost, the velocity string does not need to be pulled out, and due to increase of the fed depth of a plunger, the drainage and gas production effect obtained by adopting plunger airlift independently can be improved.

Description

Technical field [0001] The present invention relates to the technical field of gas field exploitation, in particular to a method and device for gas-lift drainage and gas recovery with speed pipe string supporting plunger gas lift. The present invention is a drainage gas recovery for liquid-accumulated gas wells, which is a solution to the entire life cycle of gas wells from commissioning to abandonment The internal drainage gas recovery method is suitable for the entire life cycle drainage gas recovery of low-pressure, low-yield and easy-to-liquid gas wells. Background technique [0002] As the production time of the gas well continues, the productivity of the gas well gradually decreases. When the liquid-carrying flow rate is lower than the critical liquid-carrying flow rate, liquid begins to accumulate at the bottom of the well. If liquid drainage measures are not taken in time, the gas well may be flooded and stop production. Velocity string drainage gas recovery technology is...

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Problems solved by technology

[0005] In order to overcome the problem that the existing tools cannot eliminate the liquid accumulation about 150m below the adapter, reduce the effect of plunger gas lift drainage gas recovery and gas well production, the present invention provides a plunger gas lift drainage gas recovery method with a velocity string And the device, the present invention solves the problem that the wellbore fluid accumulation cannot be completely eliminated by using the velocity pipe column drainage gas recovery or the plunger gas lift drainage gas recovery technology alone, and the method can solve the drainage gas recovery of the gas well in the entire life cycle from commissioning to abandonment The problem is that this method is simple, fast, and low in cost. It does not need to pull out the velocity string, and because the depth of the plunger is increased, it can improve the drainage and gas recovery effect of the plunger air lift alone.

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