A method for simultaneous extraction and utilization of coalbed methane and accumulated water in goafs

Abstract

The invention, which belongs to the technical field of accumulated water treatment and gas utilization in goaf, particularly relates to a method for simultaneously extracting and utilizing coalbed methane and accumulated water in a goaf so that a problem of being lack of an effective process for the simultaneous extraction and utilization of the coalbed methane and accumulated water in the existing goaf can be solved. On the basis of the phenomenon of coexistence of the accumulated water and coalbed methane in most of goaf, short vertical drilling is constructed downwardly and then a drillingplatform is built in a drilling well to carry out extraction and water-pumping drilling; and extraction and utilization are carried out on the oalbed methane and accumulated water in a goaf. With declining of the accumulated water level in the goaf, lots of coalbed methane is leaked from residual coat in a crushed zone; extraction drilling is carried out at a fissure tape of the goaf to realize extraction. Therefore, the residual resources in the goaf are developed and utilized effectively and the accumulated water in the goaf is utilized as resources, so that a potential safety hazard of water leakage of next coal seam exploitation due to the water accumulation of the goaf is eliminated. The method is an effective measure that being capable of creating economic benefits and eliminating the hidden dangers in mine production.

Description

technical field [0001] The invention belongs to the technical field of goaf accumulated water treatment and gas utilization, and in particular relates to a method for simultaneous extraction and utilization of coalbed methane and accumulated water in a goaf. Background technique [0002] Due to the early production and utilization of coal mines in our country, a large number of goafs have been left behind after long-term industrialized mining. Taking Shanxi Province as an example, by the end of 2013, the area of ​​mined-out areas has reached 5,000 square kilometers. Due to the backward production technology and equipment used in these mined-out areas, the coal recovery rate is low, so there are a large number of available mined-out areas in the mined-out areas. According to relevant data, the coalbed methane resources in the gobs of Shanxi Province alone are about 3 billion cubic meters. As a clean energy source, coalbed methane can effectively alleviate the shortage of nat...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of lack of effective technological means in the existing goaf accumulated water and coalbed methane synchronous extraction and utilization, the present invention provides a method for simultaneous extraction and utilization of coalbed methane and accumulated water in the goaf

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