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Coal seam biological plugging removal method

A coal seam and biological technology, applied in the direction of earth drilling, cleaning equipment, mining fluids, etc., can solve the problem that it is difficult to maintain the smooth passage of coalbed methane migration for a long time, so as to increase the air permeability of coal body and increase the passability Effect

Inactive Publication Date: 2017-05-17
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the characteristics of the coal body, various fracturing and plugging removal measures are difficult to maintain the smooth flow of coalbed methane migration channels for a long time

Method used

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  • Coal seam biological plugging removal method
  • Coal seam biological plugging removal method
  • Coal seam biological plugging removal method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: The plugging removal method: using the individual advantages of microorganisms and the special metabolic effect on the coal body to digest the coal crack blocking particles, expand the crack channel, improve the air permeability of the coal body, and realize the unblocking and dredging of the coal seam crack;

[0029] First, carry out the induction and expansion of bacterial strains on the target coal seam: use nutrient-rich medium to induce the microbial population, accelerate the activity and reproduction speed of the coal matrix-degrading bacteria in the bacterial population, and increase the number of coal-matrix-degrading bacteria. reach 10 8 above;

[0030] Second, strengthen the supply of auxiliary nutrients to the blocked area: strengthen the supply of auxiliary nutrients other than the nutrients that the coal matrix can provide to the blocked area; use this method to promote the utilization rate and degradation rate of the coal matrix by microorga...

specific Embodiment approach

[0033] The specific implementation of the coal seam biological plugging removal technology is as follows:

[0034] First, induce the microbial structure of the target coal seam; inject nutrient-rich induction medium into the coal body, and monitor the microbial activity in the unblocked coal seam area. Firstly, monitor the variation of carbon dioxide in the gas extracted from the gas production well, and the stabilized carbon dioxide concentration should be kept at 5 to 10 times the original concentration; monitor the acetate concentration in the water sample of the extraction well, and the stabilized acetate content should be equal to the original 20 to 30 times the concentration.

[0035] The composition of the induction medium is as follows:

[0036]

[0037] Second, carry out the cultivation of coal matrix degrading bacteria; monitor the content of coal matrix degrading bacteria in the water samples of the drainage wells in the unblocking coal seam area, so that the nu...

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Abstract

The invention relates to a biological plug removal method for a coal seam, and belongs to a coal seam plug removal method. The biological plug removal method for the coal seam comprises the steps that digestion is conducted on plugging particles in a coal fracture through the adoption of the individual advantage of microorganism and special metabolism to the coal body of the microorganism, a fracture channel is expanded, the breathability of a coal body is improved, and plug removing and dredging of the coal seam fracture are achieved; during the implementation process of the prior art, a coalbed methane migration pathway is easy to be plugged, so that the breathability of the coal body is lowered, the exploitation efficiency of the coalbed methane is lowered, and gas control difficulty is improved; organic matter hydrolyzing bacteria and zymophyte with efficient hydrolysis are cultivated in the coal body through screening and expanding cultivation of the functional; the plugging particles are digested and the fracture pathway is expanded through the degradation function on the coal body of the biological metabolism, dredging of the plugging pathway of the coal seam is achieved, and the breathability of the coal body is improved. Chemical plug removal method which is heavy in pollution and high in governing cost can be replaced; through the safer and more efficient plug removing of the coal seam migration pathway, the exploitation level of the coalbed methane is improved, and the gas drainage effect is improved.

Description

technical field [0001] The invention relates to a coal seam blocking removal method, in particular to a coal seam biological blocking removal method. Background technique [0002] Good coal gas permeability is a necessary condition to ensure coalbed methane mining and gas control. Coal is a complex macromolecular structure composed of porous structure, weak supporting capacity, brittle core, and composite of organic and inorganic molecules. In the process of coalbed methane drainage, affected by the construction technology and geological conditions, it is very easy to cause the peeling of coal surface materials, resulting in the blockage of micro-cracks. This phenomenon will reduce the gas permeability of the coal body and directly affect the efficiency of coalbed methane extraction and the difficulty of gas control. For blocked coal seams, fracturing is often used to reconstruct fracture channels. However, limited by the characteristics of coal bodies, various fracturing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B37/06E21B43/26
Inventor 肖栋张聪张建国彭苏萍刘忠
Owner CHINA UNIV OF MINING & TECH
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