Coalbed gas well combined layer drainage device and technology in high stress area

Abstract

The invention discloses a combined layer drainage device and process for a coalbed gas well in a high-stress area. The oil pipe in the production casing of the gas well, the sucker rod connected to the beam pumping unit arranged in the oil pipe, and the tubular pump connected to the bottom of the sucker rod in sequence, liner pipe, pressure gauge holder, gas anchor, wire wrapping screen pipe, sand settling pipe and plug; the monitoring and control system includes casing pressure gauges and needle valves set on the gas production line of the production casing, cock valves set on the drainage line of the tubing, and pressure gauge holders Dual direct-reading electronic pressure gauges; the drainage process includes multiple drainage cycles, and each cycle is divided into four stages: drainage and pressure suppression, pressure stabilization and production increase, pressure control and production stabilization, and pressure reduction and decay. The invention solves the difficult problem that the coal reservoir is easily damaged under the condition of combined bed drainage in the high stress area, and can significantly prolong the time for high and stable production of the coal bed gas well.

Description

technical field [0001] The invention belongs to the technical field of coalbed methane ground mining, and in particular relates to a device and a process for coalbed methane well combined bed drainage in a high-stress area. Background technique [0002] my country is rich in coalbed methane resources, and the geological resources of shallow coalbed methane with a buried depth of 2000m are predicted to reach 36.8×10 12 m 3 , equivalent to conventional natural gas resources. Large-scale development of coalbed methane can alleviate the shortage of conventional oil and gas energy in my country, reduce the probability of coal mine gas accidents, reduce greenhouse gas emissions in coal mine production, and produce significant economic, environmental, safety and social benefits. [0003] Southwest my country, represented by eastern Yunnan and western Guizhou, is rich in coalbed methane resources and has great potential for resource development. Eastern Yunnan and western Guizhou...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a coalbed gas well combined layer drainage device and process in the high stress area to solve the problem in the prior art that the coal reservoir in the high stress area is highly sensitive and is easily damaged during the combined layer drainage process. It is difficult for gas wells to produce high and stable production for a long time

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