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
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[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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