Distributed airbag pressure self-adjusting coalbed methane collecting device

Abstract

The invention provides a distributed airbag pressure self-adjusting coalbed methane collecting device which comprises a vertically arranged outer casing which is uniformly provided with a plurality ofventing holes, the outer casing is internally provided with an upper coalbed methane pressure regulating device for adjusting the opening degrees of venting holes at the same height and a lower coalbed methane pressure regulating device for adjusting the opening degrees of venting holes at the same height. The upper coalbed methane pressure regulating device is in an upper gas layer, the lower coalbed methane pressure regulating device is in a lower upper gas layer, and a ground layer is between the upper gas layer and the lower gas layer. The structures of the upper coalbed methane pressureregulating device and the lower coalbed methane pressure regulating device are the same. The distributed airbag pressure self-adjusting coalbed methane collecting device has the advantages of novel design and compact structure, the air pressure adjustment between gas layers of different pressures in a coalbed methane collecting process is achieved through a pure mechanical structure, therefore, both a high-pressure gas layer and an adjacent low-pressure gas layer can be properly pumped, and the difficulty in the efficient development of coalbed methane in multiple coal seams in the southwest is reduced.

Description

technical field [0001] The invention belongs to the technical field of coal bed methane exploitation, and in particular relates to a distributed air bag type pressure self-regulating coal bed methane collection device. Background technique [0002] The Yunnan-Guizhou-Sichuan-Chongqing area is one of the important coalbed methane replacement bases in my country. The effective development of its coalbed methane can not only release huge coalbed methane resources in multi-coal seam areas, but also provide an important supplement for oil and gas resources in Southwest China. In recent years, through joint efforts with external scientific research institutes, survey and design units, colleges and universities and related enterprises, the development of coalbed methane in Guizhou Province has achieved initial results, but there is still no substantial breakthrough, and large-scale ground drainage is still difficult to achieve . This area is part of the Permian Yangtze coal-accumu...

AI Technical Summary

Problems solved by technology

In addition, when the pressure gradient of the coal seam differs greatly, the pressure transmission rate differs greatly, resulting in a significant difference in liquid supply capacity, which affects the effect of partial pressure co-production

Due to the large number of coal seams and the uneven distribution of the plane, the pressure system has large changes in both vertical and horizontal directions, coupled with cost constraints, it is difficult to obtain the reservoir pressure of the fractured layer of each development well through the test of coalbed methane. , greatly restricting the efficient development of multi-coal seam CBM in Southwest China

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