Method and system for predicting coalbed methane of double-pore coal body

A technology of double porosity and prediction method, which is applied in the direction of prediction, special data processing applications, instruments, etc., can solve the problems of manpower, time and economic cost, and the inability to directly and accurately predict the later production of coalbed methane

Active Publication Date: 2021-09-14
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

[0003] In addition, due to the limitations of some conditions on the site, such as time and economic costs, it is only possible to predict the amount of gas drainage in a short period of time, and it is impossible to directly and accurately predict the late production of coalbed methane several years or even decades later.
In addition, many key paramete

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  • Method and system for predicting coalbed methane of double-pore coal body
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  • Method and system for predicting coalbed methane of double-pore coal body

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[0055] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. The various examples are provided by way of explanation of the application and do not limit the application. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present application without departing from the scope or spirit of the application. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield yet another embodiment. Therefore, it is intended that this application cover such modifications and variations as come within the scope of the appended claims and their equivalents.

[0056] In the examples of this application, the coal matrix is ​​an isotropic, average-valued porous medium sphere, and its porosity and diffusion coefficient are uniform and unaffected by changes in gas pressure in the coal matrix; the te...

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Abstract

The invention belongs to the technical field of testing or analyzing materials by means of measuring chemical or physical properties of the materials, and provides a coal bed gas prediction method and system for a double-pore coal body. The method comprises the steps: arranging gas flow field grid nodes around drill holes in the radial direction of a coal matrix and the radial direction of the coal seam drill holes in a coal body; based on a finite difference method, according to the grid nodes of the gas flow field around the drill hole, discretizing a preset coal body double-pore gas flow model, and obtaining a coal body double-pore gas flow difference model; on the basis of a double-pore gas flow difference model of the coal body, obtaining the fracture internal gas pressure of each fracture flow field grid node in the gas flow field grid nodes around the coal seam drill hole; and according to the gas pressure in the fracture of the fracture flow field grid nodes, based on the Darcy law, calculating the gas flow and/or the gas extraction amount of the drill hole. Therefore, the dynamic change of the extraction quantity of the coal bed gas in a long time period and the accurate prediction of the production quantity of the coal bed gas are realized.

Description

technical field [0001] The present application belongs to the technical field of testing or analyzing materials by means of measuring chemical or physical properties of materials, and relates to a method and system for predicting coalbed methane for double-porosity coal bodies. Background technique [0002] Coalbed methane (commonly known as "gas") is the main associated gas in coal mines, and its main component is methane, which is one of the main causes of underground coal mine accidents. At present, the fundamental control measures to deal with gas disasters are underground drilling to extract gas. Extracting gas from mining coal seams can not only reduce coal mine gas accidents, but also cleanly utilize CBM in coal seams as a natural gas resource, which can be said to kill two birds with one stone. As a strategic resource in the world, how to reasonably predict the dynamic production behavior of coalbed methane and evaluate the output of coalbed methane has always been ...

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Application Information

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IPC IPC(8): G06F30/23G06Q10/04G06Q50/06
CPCG06F30/23G06Q10/04G06Q50/06
Inventor 刘伟徐浩刘佳秦跃平张凤杰毋凡褚翔宇陈伟赵政舵郭铭彦
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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