High-pressure, oxygen-free, yield-increasing and plug-release gas injection device of CBM (Coal Bed Methane) well and using method of high-pressure, oxygen-free, yield-increasing and plug-release gas injection device

Abstract

The invention provides a high-pressure, oxygen-free, yield-increasing and plug-release gas injection device of a CBM (Coal Bed Methane) well. The invention has the technical scheme that the high-pressure, oxygen-free, yield-increasing and plug-release gas injection device mainly consists of an internal combustion engine (1), a hydraulic clutch (2), a compressor (3), a fuel tank (4), a purification filter (5), gas transmission pipes (6), a dosing tank (7), a control cabinet (8) and a skid-mounted cabinet (9), wherein the internal combustion engine (1) is connected with the compressor (3) through the hydraulic clutch (2) and is connected with the compressor (3) through one gas transmission pipe (6); the compressor (3) is connected with the purification filter (5) through one gas transmission pipe (6); the fuel tank (4) is arranged above the purification filter (5); one gas transmission pipe (6) is connected with the dosing tank (7); the control cabinet (8) is arranged above the dosing tank (7). The invention also provides multiple steps of a using method of the high-pressure, oxygen-free, yield-increasing and plug-release gas injection device. According to the high-pressure, oxygen-free, yield-increasing and plug-release gas injection device of the CBM well and the using method, provided by the invention, the design is reasonable and practical, the cost is low, the operation is simple and convenient, more methane is replaced through injecting gas in a CBM reservoir, the yield of CBM is greatly increased, and a higher promotion and application value is obtained.

Description

Technical field: [0001] The invention relates to the technical field of coalbed gas wells, in particular to a high-pressure anaerobic production increasing and plugging-removing gas injection device for coalbed gas wells and a method for using the same. Background technique: [0002] The storage state of CBM in coal seam is divided into adsorption state, free state and dissolved state, of which about 90% exists in the adsorption state. If the fracture cleat system of the coal reservoir is well developed and the reservoir permeability is relatively high, when the bottom hole pressure drops below the critical desorption pressure, the coalbed methane can desorb and diffuse relatively smoothly, and seep to the bottom of the well, thereby achieving a relatively Ideal mining benefits. However, the current situation of coal reservoirs and coalbed methane mining in my country is low permeability, difficult to desorb, insufficient driving force, and development of structural coal. ....

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Problems solved by technology

[0003] The purpose of the present invention is to provide a high-pressure anaerobic production-increasing and plugging-removing gas injection device for coalbed methane wells, which can solve the outstanding problems of coal reservoirs and coalbed methane mining in my country such as low permeability, difficult desorption, and insufficient driving force.

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