Wasted mine worked out section coalbed methane ground discharge and mining method under hydrous condition

Abstract

Provided is a wasted mine worked out section coalbed methane ground discharge and mining method under a hydrous condition. According to the method, a big hole is constructed downward from the ground, a sleeve pipe is inserted into the bottom of the big hole, and the upper end of the sleeve pipe is exposed to the ground; concrete thick liquid is injected between the sleeve pipe and the big hole to conduct sealing. A small hole is constructed to the bottom of the worked out section with an axis of the sleeve pipe being a center. A water drawing pipe is inserted into the small hole, the upper end of the water drawing pipe penetrates through the sleeve pipe and is welded to the upper end of the sleeve pipe, and the side edge of the sleeve pipe is provided with a hole and is in communication with an extracting pipe. Accumulated water in the worked out section is extracted through the water drawing pipe, then the coalbed methane which is hosted in the residual coal of the worked out section is released, and at this time, the coalbed methane can be extracted through the extracting pipe. According to the wasted mine worked out section coalbed methane ground discharge and mining method under the hydrous condition, equipment is simple, the operation is convenient, and the purposes that one hole is used for multiple functions and the air water and the water are separated are achieved.

Description

technical field [0001] The invention relates to a method for extracting residual coalbed methane in goafs of underground mines on the ground, and is especially suitable for the extraction of coalbed methane in goafs of abandoned mines under the condition of water content. Background technique [0002] my country is the world's largest coal producer and consumer. The long-term large-scale and high-intensity coal mining has produced a large number of abandoned mines and huge goafs, and most of the abandoned mines are medium-high gas mines. Drainage and utilization of coalbed methane in abandoned mines can not only "turn waste into treasure" the long-neglected goaf coalbed methane resources in abandoned mines, but also provide safety guarantee for the re-mining of residual coal in abandoned mines with serious loss of coal resources . [0003] However, the hydrogeological conditions of most mines in my country are complicated, and they were flooded after they were abandoned. T...

AI Technical Summary

Problems solved by technology

[0003] However, the hydrogeological conditions of most mines in my country are complex, and they were flooded immediately after they were abandoned. As a result, a considerable part of the coalbed methane in the goaf is still blocked by hydraulic power, and it exists in the residual coal in the goaf

However, the existing goaf coalbed methane extraction technology rarely considers the impact of goaf water accumulation on coalbed methane extraction.

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