Method for increasing coal-bed gas recovery ratio by using coal-bed indigenous microbes

Abstract

The invention discloses a method for increasing coal-bed gas recovery ratio by using coal-bed indigenous microbes and belongs to the technical field of microbial gas recovery. The method comprises the steps: (1) sampling a coal-bed gas well coal-bed yielded water sample, and carrying out an analysis on the variety and quantity of beneficial indigenous microbes in the obtained coal-bed yielded water sample, wherein the beneficial indigenous microbes are microbes, which produce methane, nitrogen gas and carbon dioxide through metabolism, in a coal bed; (2) determining a formula of a nutrient solution suitable for the growth of the indigenous microbes according to an analysis result on the indigenous microbes obtained in the step (1); (3) preparing the nutrient solution, and injecting the nutrient solution into a gas well. Through adding a nutritional system into the coal bed, beneficial indigenous microflora in the coal bed are activated, and the yield of coal-bed gas is increased by using gases such as methane, nitrogen gas and carbon dioxide and organic acids generated through the underground fermentation of the indigenous microflora. According to the method, bacterial solutions are not required to be prepared, the process is simple, the operation is easy, and the method is safe and environment-friendly.

Description

technical field [0001] The invention relates to a method for improving the recovery rate of coal bed gas by using endogenous microorganisms in coal seams, and belongs to the technical field of microbial gas recovery. Background technique [0002] Coalbed methane is unconventional natural gas that is self-generated and self-storage in coal seams. China's coalbed methane resources buried at a depth of less than 2,000 meters are 36.81 trillion cubic meters, ranking third in the world. The development and utilization of coalbed methane has multiple effects: improving the level of prevention of gas accidents, which has a safety effect; effectively reducing greenhouse gas emissions and producing good environmental protection effects; as an efficient and clean energy, producing huge economic benefits and making up for conventional The lack of energy will improve my country's energy structure to a certain extent. [0003] The extraction rate of coalbed methane in our country is low,...

AI Technical Summary

Problems solved by technology

[0008] (1) High-rank coal seams have a high degree of carbonization and are not easily degraded by microorganisms, so the recovery rate of coalbed methane cannot be improved through the existing microbial gas recovery technology;

[0009] (2), the existing microbial gas recovery technology needs to prepare bacterial liquid, and the process is complicated

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