Method for production increasing of coal-bed gas through combination of heat injection decomposition and microbial degradation

Abstract

The invention discloses a method for production increasing of coal-bed gas through combination of heat injection decomposition and microbial degradation, and belongs to the technical field of coal-bed gas mining. The method comprises the three steps of high-temperature heat-resistant methanogen enrichment culture, heat injection decomposition and microbial degradation for production increasing of the coal-bed gas, coal structure decomposition at the high temperature is realized through heat injection, and thus microbial degradation of coal is promoted so as to increase the recovery ratio of the coal-bed gas. Through heat injection, on the one hand, the coal structure is changed, organic matter in the coal is dissolved, microbial degradation is facilitated, and the speed of biological reaction is increased; and on the other hand, the permeability of a coal seam is improved, an channel is opened for a coal seam injection bacterium group, a methane flow channel is unblocked, the coal-bed gas and the bacterium group are transported in the coal seam advantageously, and the recovery ratio of the coal-bed gas is increased.

Description

technical field [0001] The invention relates to a method for increasing production of coalbed methane by combining thermal injection decomposition and microbial degradation, and belongs to the technical field of coalbed methane exploitation. Background technique [0002] As an important natural gas resource, coalbed methane is an important clean energy and chemical raw material. my country has abundant reserves of coalbed methane, ranking second in the world. In order to meet the energy demand, there is an urgent need to accelerate the development of coalbed methane. However, the low recovery rate of coalbed methane seriously restricts the development of coalbed methane industry, and the coalbed desorption rate, diffusion rate and seepage rate all affect the production of coalbed methane. How to increase the production of coalbed methane has become an important research content of today's coalbed methane development. Coalbed methane biogenesis, as an important part of coa...

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Problems solved by technology

[0003] The present invention aims to provide a method for increasing the production of coalbed methane by thermal injection decomposition and microbial degradation. By improving the gas permeability of the coal seam, increasing the temperature of the coal seam, and dissolving the coal to be more conducive to the utilization of microorganisms, it can solve the problem of low gas permeability of the coal seam and coalbed methane production. low yield problem

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