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A method of improving coalbed methane production by using native bacteria

A technology of coalbed methane and native bacteria, which is applied in the preparation of test samples, bacteria, and earth-moving drilling, etc., can solve the problems of high energy consumption, long processing time, low work efficiency, etc., to improve coal seam structure and reduce energy consumption and enhance efficiency

Inactive Publication Date: 2018-09-04
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Patent No. 201410363562.2 discloses a method for improving the recovery of coalbed methane, specifically using in-situ microbial flora in coal seams and supercritical CO 2 Pretreatment of coal seams improves the recovery of coalbed methane, but supercritical CO 2 The processing time is long, the energy consumption of long-term work is high and manual comparison is required to determine the best experimental conditions, and the work efficiency is low

Method used

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  • A method of improving coalbed methane production by using native bacteria
  • A method of improving coalbed methane production by using native bacteria
  • A method of improving coalbed methane production by using native bacteria

Examples

Experimental program
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Embodiment 1

[0039] A kind of method that utilizes native bacterium to improve coalbed methane output provided by the invention, the steps are as follows:

[0040] (1) The target coalbed methane field is a certain area in the south of the Junggar Basin in Xinjiang. Coal samples from coalbed methane reservoirs are collected, and samples are taken at the wellhead of the coalbed methane. The sample bottles are pre-sterilized and filled with nitrogen. The air remains, and it is sent into the anaerobic incubator in a shading manner within 24 hours; the colony structure is extracted from the coal sample and water sample, and the microbial community structure of the coal sample and water sample is analyzed by cloning library technology For analysis, the bacterial species were quantitatively analyzed by qPCR technology.

[0041] The target coal seam for CBM development is the coal seam of the Xishanyao Formation in the Middle Jurassic, with a reservoir pressure of 3.8MPa, a reservoir temperature o...

Embodiment 2

[0074] On the basis of the foregoing embodiment, the optimal parameters obtained in the step (5) are: the optimal parameter pressure of the ultrasonic treatment is 0.8Mpa, the ultrasonic frequency is 80kHz, the processing time is 20min, and the supercritical CO 2The optimal parameter pressure for processing is 8.2MPa, and the processing time is 30h. Under this condition, the ultrasonic coupling supercritical CO 2 The amount of methane produced by biodegradation per unit mass of coal after treatment is the largest.

[0075] The gas composition and methane concentration change at the gas production port in the step (9) are measured by a methane analyzer and a gas chromatograph.

Embodiment 3

[0077] On the basis of the above-mentioned embodiments, in the step (2), each bacterial strain combination is added with anaerobic fermentation bacteria to enhance the degradation degree of coal, and determine the most favorable bacterial colony combination for gas production in the target coal seam through the collocation of different combinations, and at the same time Avoid inhibition between colonies.

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Abstract

The invention provides a method for increasing the coal bed gas yield through indigenous bacteria. The method comprises the steps of (1) a methanogens community is enriched and cultured, specifically, a coal sample and a water sample are collected from a target zone, enrichment culture and fermentation of the methanogens community are conducted, and fermentation liquor is obtained; (2) ultrasonic coupling supercritical CO2 treatment is conducted, specifically, a laboratory operation and maintenance management system is used, the optimal condition for ultrasonic coupling supercritical CO2 treatment on the coal seam sample is analyzed in a laboratory, and a target coal seam is treated under the optimal condition; and (3) coal degradation through microorganism is conducted, specifically, the fermentation liquor obtained in the step (1) is injected into the target coal seam, changes of injection wellhead gas components and the methane concentration are detected continuously, and methane is gathered in drainage, pressure lowering and recovering modes. The treatment time is effectively shortened through the ultrasonic coupling supercritical CO2 treatment, the coal bed gas generation speed is increased, and meanwhile the working efficiency is effectively improved through the laboratory operation and maintenance management system.

Description

technical field [0001] The invention relates to the technical field of increasing the output of coal bed gas, in particular to a method for increasing the output of coal bed gas by using native bacteria. Background technique [0002] CBM has been explored and developed in high-, medium-, and low-rank coal basins, but the low gas content of low-rank coal and low permeability of high-rank coal seriously restrict the development of CBM industry. Using microorganisms to increase production, that is, injecting methane-producing microorganisms into the coal seam, degrading the organic matter in the coal, increasing the content of methane, and improving the pore structure of the coal seam by consuming the matrix in the coal, increasing the permeability, can greatly increase the production of coalbed methane . [0003] Patent No. 201410363562.2 discloses a method for improving the recovery of coalbed methane, specifically using in-situ microbial flora in coal seams and supercritica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/16E21B43/22G01N1/28C12N1/20
CPCC12N1/20E21B43/006E21B43/16E21B43/164G01N1/28Y02E50/30
Inventor 李勇牛鑫磊吴鹏汪虎
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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