Method for changing coal permeability by using hydrogen-producing acetogenic bacteria

A technology of hydrogen-producing and acetogenic bacteria and permeability, which is applied in chemical instruments and methods, bacteria, and earth-moving drilling and mining, etc., can solve the problems of poor control of bacterial structure, difficult to enlarge and cultivate, and interference, and achieve easy control. Reaction process, easy to scale up culture, low cost effect

Active Publication Date: 2021-12-03
CHINA UNIV OF MINING & TECH
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  • Claims
  • Application Information

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Problems solved by technology

However, the injection of mixed bacteria is difficult to enlarge and cultivate the flora, and the flora structure is not

Method used

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  • Method for changing coal permeability by using hydrogen-producing acetogenic bacteria
  • Method for changing coal permeability by using hydrogen-producing acetogenic bacteria
  • Method for changing coal permeability by using hydrogen-producing acetogenic bacteria

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Embodiment Construction

[0025] Embodiments of the present invention will be further described below in conjunction with accompanying drawings:

[0026] A kind of method of the present invention utilizes hydrogen-producing acetogenic bacteria to change the biological increase of coal seam permeability, and its steps are:

[0027] Step 1. First, select the laboratory hydrogen-producing and acetogenic bacteria Clostridiumsp.BXX for enrichment and domestication;

[0028] Step 2. Select a coal seam with low permeability, inject the nutrient solution of hydrogen-producing acetogenic bacteria into the coal seam by drilling and hydraulic fracturing, and then seal the hole. For every 1L of coal space, add 660mL of hydrogen-producing bacteria For the culture solution of acetogenic bacteria, the inoculum volume should reach 10%;

[0029] Step 3: The hydrogen-producing acetogenic bacteria injected into the low-permeability coal seam produce acetic acid and hydrogen, and the macromolecular organic matter in the ...

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Abstract

The invention discloses a method for changing the permeability of a coal seam by using hydrogen-producing acetogenic bacteria. The method is suitable for being used in a low-permeability coal seam. Firstly, a nutrient solution of the hydrogen-producing acetogenic bacteria is injected into the coal seam in a drilling and hydraulic fracturing mode, then hole sealing operation is carried out, the hydrogen-producing acetogenic bacteria injected into the low-permeability coal seam produce acetic acid and hydrogen, macromolecular organic matter in coal serves as a substrate for life activity of the hydrogen-producing acetogenic bacteria to be converted into the acetic acid, a substrate is provided for methanogens in the coal seam, and the methanogens are promoted to generate methane; waste liquid flows back to the ground through reverse drainage, meanwhile, the permeability of the coal seam is also increased under the corrosion of the acetic acid and the extrusion action of the generated hydrogen and methane gas; and coal bed gas in a coal bed is extracted. The method is easy to implement and low in investment, a single strain is easy to amplify and culture, the reaction process is also controllable, and the influence on the stress distribution condition of a mine is small.

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...

Claims

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Application Information

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IPC IPC(8): E21B43/22E21B43/26C09K8/582C12N1/20
CPCE21B43/006E21B43/16E21B43/2605E21B43/27C09K8/582C12N1/20
Inventor 何环曹玥黄再兴占迪陈子豪黄冠华
Owner CHINA UNIV OF MINING & TECH
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