Biological permeability-increasing method for coal reservoir

A coal reservoir and biological technology, applied in the direction of earth drilling, mining fluid, wellbore/well components, etc., can solve problems such as gas drainage

Active Publication Date: 2013-01-30
山西蓝焰煤层气集团有限责任公司 +1
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Problems solved by technology

[0003] Coal reservoir permeability is a key parameter for coalbed methane development and coal mine gas control. So far, coal reservoirs have been mainly enhanced by purely physical means, such as hydraulic fracturing, open-hole caves, protection layer mining, local coal seam loosening blastin

Method used

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Embodiment Construction

[0020] A biological anti-permeability method of a coal reservoir of the present invention comprises the following steps in sequence,

[0021] (1) Select the vitrinite reflectance R o , max <1.60% middle and low rank coal reservoirs;

[0022] (2) A channel for injecting liquid into the coal seam is formed by drilling on the ground or underground in the coal mine;

[0023] (3) Select and cultivate microbial strains that are suitable for anaerobic environment and can effectively utilize coal;

[0024] (4) Inject the nutrient solution containing microbial strains into the coal reservoir through hydraulic fracturing or coal seam water injection;

[0025] (5) According to different coal ranks, the basic principle for determining the shut-in time: reflectivity R o , max =1.3% (fat coal) coal reservoir shut-in time is not less than 4 months, R o , max =0.5% (long-flame coal) coal reservoirs shall be closed for no less than 2 months;

[0026] (6) Organize follow-up productio...

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Abstract

The invention discloses a biological permeability-increasing method for a coal reservoir, which comprises the following steps in turn: (1) selecting a middle/low-class coal reservoir; (2) forming a channel for injecting liquid into the coal reservoir in a drilling mode or other mode; (3) selecting and culturing microorganism strains suitable for an anaerobic environment and capable of effectively utilizing coal; (4) injecting the nutrient liquid containing the microorganism strains into the coal reservoir in a hydraulic fracturing mode or other mode; (5) confirming shutdown time of a well according to the difference of the coal rank; (6) organizing the subsequent production according to the conventional coal-bed gas well draining extraction or gas extraction process; and (7) checking an effect. A permeability-increasing technology for the coal reservoir is a key point for the coal bed gas resource development and the coal mine gas treatment. The invention provides the permeability-increasing technology utilizing the biotechnology for the middle/low-class coal reservoir; the coal is degraded by the microorganisms, so that the purpose of increasing the permeability of the coal reservoir is achieved; and the biological permeability-increasing method for the coal reservoir has a significance in promoting the coal bed gas resource development and the coal mine gas extraction.

Description

technical field [0001] The invention belongs to the technical field of coal mine production, and in particular relates to a biological anti-permeability method for coal reservoirs by using microorganisms to improve the permeability of middle and low rank coal reservoirs. Background technique [0002] At present, people have reached a consensus on the use of coal as raw material by some specific microorganisms to convert biogenic methane, that is, in low- and medium-rank coal reservoirs, as long as the temperature, pressure, pH value, Eh value, salinity and nutrient The material meets the growth requirements of microorganisms, and can completely convert coal into methane-based gas, and the conversion of microorganisms to coal will obtain continuous coalbed methane resources. The total amount of coalbed methane currently produced in the Powder River Basin of the United States is much higher than the total amount of resources discovered in the exploration stage, indicating that...

Claims

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Application Information

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IPC IPC(8): E21B43/22E21B43/26
Inventor 郭红玉苏现波夏大平马俊强张双斌林晓英刘晓宋金星蔺海晓
Owner 山西蓝焰煤层气集团有限责任公司
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