Drainage gas production system and method for prolonging life periods of gas fields and gas wells

Abstract

The invention provides a drainage gas production system for prolonging life periods of gas fields and gas wells. The system comprises a plurality of gas-liquid separators, a plurality of gas output pipes, a plurality of gas input pipes, an export pipeline, and an air compressor. The gas-liquid separators respectively correspond to a plurality of gas wells to be separated from gas and liquid. One end of each gas output pipe is located in each gas well, and the other end of each gas output pipe is connected with an inlet of each gas-liquid separator. One end of each gas input pipe is connected with a gas outlet of each gas-liquid separator, and the other end is located in the next gas well. The export pipeline is connected with a gas input pipe at the tail end to output the gas outward. Theexport pipeline is further provided with a flow valve. A gas inlet end of the air compressor is connected with the gas input pipe at the tail end through a first circulation pipe, and a gas outlet endof the air compressor is connected with each gas input pipe through a second circulation pipe. Both the first circulation pipe and the second circulation pipe are provided with first valves. The invention further provides a drainage gas production method. The system has simple process, low cost, convenient operation and strong practicability, and can improve the final recovery rate of the gas fields.

Description

technical field [0001] The invention relates to the technical field of low-yield gas well development, in particular to a drainage and gas recovery system and method for prolonging the lifespan of a gas well in a gas field. Background technique [0002] In the process of natural gas exploitation, with the prolongation of gas well production time, the production of single well is gradually decreasing, the liquid carrying capacity is gradually getting worse, and the wellbore liquid accumulation is becoming more and more serious, seriously affecting the productivity of gas wells. Due to the existence of fluid accumulation in the wellbore of gas wells, the pressure of abandoned formations increases, which in turn affects the ultimate recovery of gas fields. It is imperative to study and innovate gas field drainage and gas recovery technology, completely eliminate wellbore fluid accumulation, increase single well production, achieve long-term stable production of gas fields, incr...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, in order to increase the output of a single well of a low-yield gas well, the production stimulation methods commonly used are: compressor gas lift, nitrogen gas lift, plunger gas lift, foam drainage and other drainage gas recovery process measures, although the above existing The measures in the technology can solve this kind of single well problem, but they also have the problems of high operating cost, heavy workload, short timeliness, and poor drainage and gas recovery in low-yield wells

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