Combined global drainage method for gas wells in mining body
A gas and drainage technology, which is applied in the field of combined upper and lower gas well drainage in mining bodies, can solve unseen problems, achieve continuous and efficient drainage, improve governance effects, and curb over-limit and limit exploitation of coalbed methane resources. Effect
Active Publication Date: 2021-12-07
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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Problems solved by technology
[0003] At present, the common gas drainage technologies mainly include long boreholes, surface L-shaped wells, and surface vertical wells in the mining area. There are no related literatures on combined drainage technologies
At the same time, there are few relevant technical literature records of mining bodies.
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[0039] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0040] The movement and deformation of the overlying rock in the stope under the influence of mining is a three-dimensional process in space and time with the advancement of the working face. The distribution of the stress field and the fracture field in the overlying rock presents obvious regional differences. During the advancing process of the working face, the internal stress of the roof and floor coal strata in a certain space around the stope is reduced due to the influence of mining, which makes the rock mass at different positions produce pressure relief, gas desorption and flow effects. This space constitutes the mining discharge. Pressurized fluid, referred to as mining body, such as figure 1 As shown, the mining body has the following main characteristics:
[0041] (1) The mining body is a three-dimensional space structure, and ...
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The invention relates to a combined upper and lower global drainage method of a gas well in a mining body, and belongs to the technical field of coal mining. The method includes the following steps: S1: arranging underground large-diameter roof directional long drilling holes, and arranging them on the return air side in a stable medium-hard roof rock layer 8 to 12 times the mining height of the mining coal seam roof, so as to realize gas gushing near the working face High-efficiency drainage; S2: Arrange L-shaped roof directional wells on the ground to realize efficient drainage of gas gushing out near the working face and gas accumulated in the goaf; S3: Arrange vertical wells on the mining ground, arranged on the return air side 0.15~ In the area of 0.3 times the length of the working face, realize the continuous drainage of the gas gushing out of the pressure-relieving coal formation adjacent to the working face and the gas accumulated in the goaf; S4: Select the drainage mode according to the type of gas gushing out of the working face. The invention realizes all-round, continuous and high-efficiency extraction of the gas in the mining body, and improves the gas control effect in the high-yield working face underground.
Description
technical field [0001] The invention belongs to the technical field of coal mining, and relates to a combined upper and lower global drainage method for gas wells of a mining body. Background technique [0002] With the advancement of coal mining technology and the promotion of the national policy of eliminating outdated production capacity, the 10,000-ton high-yield working face has gradually become the main body of modern mines. The gas "bursting" characteristic of the working face is obvious, and it is difficult to effectively control the single gas extraction technology. , the joint extraction technology model is an effective means. [0003] At present, the common gas extraction technologies mainly include long boreholes, surface L-shaped wells, and surface vertical wells in the mining area. There is no relevant combined extraction technology literature. At the same time, there are few technical documents related to mining bodies. [0004] Therefore, based on the minin...
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IPC IPC(8): E21B43/00E21F7/00G06F30/20
CPCE21B43/006E21F7/00G06F30/20
Inventor 孙东玲李日富孙海涛刘见中林府进曹揭付军辉王然
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD