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Assessment method and system of coalbed methane reserve volume at coal mining stable region

A technology for mining stable areas and coalbed methane reserves, applied in geophysical surveys, instruments, etc., can solve the problems of difficult gas reserves that can be extracted and high construction costs of ground drilling

Active Publication Date: 2013-09-25
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the high construction cost of ground drilling, comparative analysis of economic benefits is also essential. This requires predicting the minimum total amount of gas extracted from ground drilling in advance. The internal extractable gas reserves are still a major problem in field application

Method used

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  • Assessment method and system of coalbed methane reserve volume at coal mining stable region
  • Assessment method and system of coalbed methane reserve volume at coal mining stable region
  • Assessment method and system of coalbed methane reserve volume at coal mining stable region

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Experimental program
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Effect test

Embodiment 1

[0069] figure 1 It shows a schematic diagram of the effective pressure relief range of the surrounding rock in the mining stable area of ​​the coal mine; in the figure, 1 is the coal seam goaf, 2 is the mined coal seam, and 3 is the visible pressure relief area of ​​the roof and floor surrounding rock in the goaf (separation cracks development area), 4 is the invisible effective pressure relief area (micro-crack development area) of the surrounding rock of the goaf roof and floor, and 5 is the transitional pressure relief area of ​​the surrounding rock of the roof and floor. 1, 3, and 4 in the figure are the main evaluation target areas of the evaluation system, and 5 is less affected by pressure relief, which is not enough for the coalbed methane in the surrounding coal formations to pass through this area, forming the boundary of the evaluation target area.

[0070] figure 2 It shows the schematic diagram of sub-hole sealing and water injection test in downhole; in the fig...

Embodiment 2

[0124] The difference between this embodiment and embodiment 1 is only:

[0125] This embodiment 2 provides a method for evaluating coalbed methane reserves in a coal mine mining stable area, including the following steps:

[0126] 1) Obtain information such as the boundary conditions of the mining stable area, the deployment of the mining roadway, and the mining process of the working face where the coalbed methane reserves need to be estimated;

[0127] 2) Obtain the basic situation of the mining coal seam in the mining stable area where the coalbed methane reserves need to be estimated, as well as the lithology and occurrence and distribution characteristics of the roof and floor strata;

[0128] 3) Obtain the damage relief height, depth and pressure relief angle of the roof and floor strata in the mining stable area where the coalbed methane reserves need to be estimated;

[0129] 4) Discriminate the applicable conditions of the model. If the basic discrimination conditio...

Embodiment 3

[0191] The difference between this embodiment and embodiment 2 only lies in:

[0192] see Figure 5 The method for estimating coalbed methane reserves in the coal mine mining stable area of ​​the present embodiment 3 comprises the following steps:

[0193] 1) Obtain key information such as the boundary range of coal mine mining stable area, the deployment of mining roadways, the mining process of the working face, and the hydrogeological conditions of the mining area where the coalbed methane reserves need to be estimated;

[0194] 2) Obtain the basic situation of the mining coal seam in the mining stable area where the coalbed methane reserves need to be estimated, as well as the lithology and occurrence and distribution characteristics of the roof and floor strata;

[0195] 3) Obtain the damage relief height, depth and pressure relief angle of the roof and floor strata in the mining stable area where the coalbed methane reserves need to be estimated;

[0196] First, use em...

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Abstract

The invention discloses an assessment computing method of coalbed methane reserve volume at a coal mining stable region. The method comprises the following steps of: (1) obtaining effective pressure relief range of a mining stable region; (2) judging application condition of an estimation model; (3) computing surrounding rock pore volume in the mining stable region; (4) obtaining free gas concentration in the mining stable region; (5) estimating residual coal quantity in the mining stable region and residual gas content; (6) estimating the coalbed methane reserve volume in the mining stable region. The study on the effective pressure relief range in the mining stable region is capable of determining the estimation border range of the coalbed methane reserve volume in the mining stable region, the estimation on the estimation model application condition is capable of selecting effective estimation region to guarantee the accuracy of the estimation result, the computing of surrounding rock pore volume and the study on the free gas concentration are capable of accurately estimating the total quantity of the free coalbed methane in the mining stable region, and the study on the residual coal quantity in the mining stable region and residual gas content is capable of accurately estimating the total quantity of adsorption coalbed methane in the mining stable region.

Description

technical field [0001] The invention belongs to the technical field of surface coalbed methane extraction in coal mining areas, and relates to the evaluation and calculation of coalbed methane reserves before surface well drainage of coalbed methane in a mining stable area. Background technique [0002] Due to the constraints of coal mining methods, techniques and equipment, the recovery rate cannot reach 100% during coal seam mining, and a large amount of floating coal remains in the goaf. At the same time, there are coal pillars with a certain thickness at the boundary of the goaf, and the desorption of methane from floating coal and coal pillars leads to the accumulation of high concentration of coalbed methane in the goaf. In addition, the pressure-relieving coalbed methane produced after the coal seam within the mining influence area is affected by mining will also enter the goaf through mining fractures. If these coalbed methane are allowed to remain underground, on t...

Claims

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Application Information

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IPC IPC(8): G01V9/00
Inventor 文光才林府进李日富孙海涛张军马代辉陈金华张玉明武文宾付军辉江万刚晁建伟
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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