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Method for extracting coal seam gas through ground fracturing and underground horizontal drill holes

A horizontal drilling and coalbed methane technology, applied in the direction of gas discharge, earthwork drilling, wellbore/well components, etc., can solve the problems of difficult gas drainage drilling, low coal seam permeability, soft coal quality, etc. To achieve the effect of increasing clean energy supply, improving coal seam permeability and reducing emissions

Active Publication Date: 2014-05-28
SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the traditional mine gas drainage mode is difficult to carry out gas drainage drilling in coal seams with soft coal quality, serious hole collapse and low coal seam permeability, and at the same time to strengthen the mine gas drainage work and ensure Mine safety production, improve the gas permeability and gas drainage efficiency of underground drilling, and provide a method for underground horizontal drilling of ground fracturing to drain coalbed methane

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  • Method for extracting coal seam gas through ground fracturing and underground horizontal drill holes
  • Method for extracting coal seam gas through ground fracturing and underground horizontal drill holes

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Embodiment Construction

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] A method for extracting coalbed methane from a ground fracturing underground horizontal borehole described in the present invention (such as figure 1 shown), including the following steps:

[0028] 1) Well layout design

[0029] The well layout is carried out on the coal mining face 3 in strict accordance with the tunneling speed of the underground roadway and the construction situation of the gas drainage drilling. In order to prevent ground fracturing from affecting the underground roadway and gas drainage boreholes (pressure jump), the drilling and fracturing construction should be completed at least 350m away from the tunneling surface of roadway 2, or at least 150m away from the underground gas drainage borehole. After completion, close the well and wait for the underground gas drainage drilling. The well spacing is 200-300m, and the coalbed met...

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Abstract

The invention relates to a method for developing underground coal seam gas, and provides a method for extracting coal seam gas through ground fracturing and underground horizontal drill holes in order to ensure the safety production of a coal shaft and improve the air permeability of the underground drill holes as well as the extraction efficiency of gas. The method comprises the following steps: 1) shaft placing design; 2) ground shaft drilling, as well as ground construction of vertical drill holes or directional drill holes for a mine in areas with roadways and without construction of underground coal seam gas extraction drill holes; 3) hydraulic fracture, namely, conducting hydraulic sand fracture after well completion so as to form high permeable fracture influenced areas; 4) underground horizontal long drill holes, namely, drilling horizontal directional seam gas extraction holes along a main mineable coal seam to form a horizontal drill hole influenced areas; the horizontal drilling hole influenced area is communicated with the fracture influenced area to realize the coal seam gas extraction. Through adopting the method provided by the invention, the hazard of coal mine gas disaster can be eliminated, and the guarantee degree of safety production of the coal mine can be improved at the same.

Description

technical field [0001] The invention relates to a method for mining coal bed gas underground, in particular to a method for mining coal bed gas underground by using drainage boreholes. Background technique [0002] Coal is an organic rock ore mainly composed of fixed carbon, which contains a certain amount of volatile matter, and ash occupies a considerable proportion in the coal seam. Coal bed gas is generated during the coalification process of peat mixture, and it is mainly stored in the form of adsorption. Among coal rocks, part of it is stored in coal seam water and coal seam gaps and fissures in a dissolved and free state. A macroscopic single coal seam is composed of many thinner coal seams and gangue, and there is a large difference in physical properties between thin coal seams and gangue; the porosity of coal rocks is extremely low, and vertical and grouped fractures are widely developed in coal seams, but The connectivity of fractures is poor, which makes the dev...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00E21B43/267
Inventor 王保玉田永东白建平李生奇赵祉友李友谊赵小山王小兵刘亮亮秦玉霞何庆宏
Owner SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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