Roof bed separation water and coal-measure gas collaborative draining method

Abstract

The invention discloses a roof bed separation water and coal-measure gas collaborative draining method. A coal-rock bed profile structure comprises a vertical well, a horizontal well, a horizontal well horizontal section, a horizontal well vertical section, a horizontal well deflecting section, a sealing device, agoaf, a coal bed, a curving sinking zone, a working face, a hard rock stratum, a softrock stratum, bed separation space and an unmined area. The roof bed separation water and coal-measure gas collaborative draining method comprises the following steps of (1), an individually coal bedgas mining stage, (2), a water-draining and gas-mining synchronized stage, and (3), an individually roof bed separation water draining stage. According to the roof bed separation water and coal-measure gas collaborative draining method, coal-measure gas drainage and mining, coal production and mine well bed separation water hazard prevention and cure are combined, the gas content in the coal bed,the working face, the goaf and a roadway when coal is stoped is reduced,the harm of gas to coal mine safety production is reduced, under the effect of the coal mining, desorption and output of methane are improved, output of coal-measure gas is increased,and the bed separation water in the bed separation space in the roof of a coal mine goafcan be prevented and cured as well; and secondary roof bed separation water hazard accidents are prevented, and the roof bed separation water and coal-measure gas collaborative draining method has great economic and social benefits.

Description

technical field [0001] The invention relates to the technical field, in particular to a method for synergistic drainage of roof delaminated water and coal-measure gas. Background technique [0002] Water disasters occur frequently in coal mines in my country. Although the conventional water disaster prevention technology and prevention and control capabilities are at the international leading level, it is still difficult to prevent and control the secondary abscission water damage on the roof without a strong aquifer. This type of water damage is harmful. Large, large instantaneous water inflow, no obvious precursor, small total water volume, and periodic characteristics have become a hidden danger that endangers mine safety production. Therefore, it is of great theoretical and practical significance to propose an economical and effective mine separation water treatment method. [0003] Existing coal-measure gas extraction methods are diverse, including vertical wells, cluste...

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Problems solved by technology

[0002] Water disasters occur frequently in coal mines in my country. Although the conventional water disaster prevention technology and prevention and control capabilities are at the international leading level, it is still difficult to prevent and control the secondary abscission water damage on the roof without a strong aquifer. This type of water damage is harmful. Large, large instantaneous water inflow, no obvious precursor, small total water volume, and periodic characteristics have become a hidden danger that endangers mine safety production. Therefore, it has important theoretical and practical significance to propose an economical and effective treatment method for mine absorptive water.

[0003] Existing coal-measure gas extraction methods are diverse, including vertical wells, cluster wells, U-shaped wells, and multi-branch horizontal wells. However, coal seams in my country generally have low porosity and permeability, so the production is low. Economic benefit is poor

[0004] Patent document CN10481131A, the patent name is "a coalbed methane well upper and lower three-dimensional joint extraction method", which does not disclose the synchronous stage of draining gas production and the stage of single-draining roof separation layer water, but only a single drainage of coalbed methane. Although it is possible to realize the three-dimensional joint drainage of coalbed methane up and down the well, it cannot solve the problem that the casing of the horizontal well is damaged by the surrounding rock due to the impact of coalbed mining and cannot continue to drain coalbed methane, nor can it take into account the safety of the mine Other issues related to production

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