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Method for improving extraction effect of single coal seam with high gas and low permeability

A low-permeability and gas technology, used in earth-moving drilling, surveying, wellbore/well components, etc., can solve the problems of complex geological conditions, unsuitable arrangement of penetration enhancement and extraction, unclear in-situ stress state, etc. Uncertainty, the effect of good development and application prospects

Active Publication Date: 2018-04-27
TAIYUAN UNIV OF TECH
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Problems solved by technology

This is because the geological conditions of coal reservoirs are very complex, the state of ground stress is not clear, and the layout of enhanced drainage is not matched.

Method used

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  • Method for improving extraction effect of single coal seam with high gas and low permeability

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Experimental program
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Effect test

Embodiment Construction

[0024] Such as figure 1 As shown, a method for improving the extraction effect of a single coal seam with high gas and low permeability, the specific method implementation steps are:

[0025] 101 ~ Drilling samples in the recovery area, testing the physical parameters of the coal body, including strength, gas content, adsorption constant, permeability coefficient and attenuation coefficient.

[0026] 102~Test the physical properties and fragmentation of the roof and floor of the coal seam. The multi-point fine AE method is used to test the stress state of the coal seam and the roof and floor, the magnitude and direction of the maximum horizontal principal stress, the minimum horizontal principal stress and the vertical stress.

[0027] 103 ~ Gas pre-drainage evaluation: whether the effect of the pre-drainage area meets the "Basic Indicators for Gas Drainage in Coal Mine".

[0028] 104~Acoustic emission Kaiser effect experiment; X, Y, Z, X45 of different measuring points o Y,...

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Abstract

The invention belongs to the technical field of gas extraction of a coal seam with high gas and low permeability, and particularly relates to a method for improving extraction effect of a single coalseam with high gas and low permeability. According to the method, by using acoustic emission Kaiser domino effect detailed tests and results of three-dimensional engineering dimension numerical valueinversion containing structural conditions, according to recovery area stress field states, matched permeability improvement and extraction processes are designed; stress field distribution characteristics, the permeability improvement and the extraction are combined and matched to improve the extraction to gas in the coal seam. According to the method, through coal storage seam evaluation, recovery area pressure relief evaluation and extraction effect evaluation, dynamic design of extraction operation is achieved, so that a systematized extraction process is formed.

Description

technical field [0001] The invention belongs to the technical field of high-gas and low-permeability coal seam gas drainage technology, in particular to a method for improving the extraction effect of a high-gas and low-permeability single coal seam. Background technique [0002] Coal bed methane, commonly known as "gas", refers to the hydrocarbon gas that exists in coal seams with methane as the main component, mainly adsorbed on the surface of coal matrix particles, and partially free in coal pores or dissolved in coal seam water. On the one hand, gas gushing out from coal mining threatens the safe production of coal mines; on the other hand, coalbed methane combustion can generate a lot of heat and hardly produce any toxic and harmful gases, which is a clean energy source. Whether it is from the perspective of coal mining safety or energy utilization, the gas should be extracted and utilized before mining or at the same time as mining. Coal seam permeability is a key par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/02E21B49/00E21B47/06
CPCE21B47/06E21B49/00E21B49/02
Inventor 段东冯小静刘文博赵凯雷任惠亮陈思顺
Owner TAIYUAN UNIV OF TECH
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