A method of changing coal permeability by using hydrogen-producing acetogenic bacteria

Abstract

The invention discloses a method for changing the permeability of a coal seam by using hydrogen-producing acetogenic bacteria, which is suitable for use in low-permeability coal seams. First, the nutrient solution of hydrogen-producing acetogenic bacteria is injected into the coal seam by drilling and hydraulic fracturing, and then the hole is sealed, and the hydrogen-producing acetogenic bacteria injected into the low-permeability coal seam produce acetic acid and hydrogen, and the large Molecular organic matter is converted into acetic acid as a substrate for the life activities of hydrogen-producing acetogenic bacteria, which provides a substrate for the methanogenic bacteria in the coal seam and promotes the methanogenic bacteria to generate methane; The rate is also increased under the corrosion of acetic acid and the extrusion of hydrogen and methane gas; the coalbed methane in the coal seam is extracted. The implementation is easy, the investment is small, the single strain is easy to scale up and cultivate, the reaction process is also controllable, and it has little influence on the stress distribution of the mine.

Description

technical field [0001] The invention relates to a method for changing coal permeability, especially a method for changing coal permeability by using hydrogen-producing acetogenic bacteria, which is suitable for use in low-permeability coal seams. Background technique [0002] Coal bed methane (CBM) is a gas that is self-generated and stored in coal seams. Its main component is methane. The development and utilization of coalbed methane has very broad prospects, and the economic benefits brought by this gas are also very considerable. According to statistical analysis, if my country can extract coalbed methane with a buried depth of less than 2,000 meters, as long as the extraction rate reaches About 40%, the utilization rate of 80% can be reached, and the specific coalbed methane that can be used is about 9.6×10 12 m 3 ~11.2×10 12 m 3 , and each cubic meter of coalbed methane resources can generate 3kW·h of electric energy. It can be seen that coalbed methane can bring g...

AI Technical Summary

Problems solved by technology

However, the injection of mixed bacteria is difficult to enlarge and cultivate the flora, and the flora structure is not easy to control, and the injected flora will also interfere with the metabolic methane production of the endogenous flora

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