Roof gas collaborative control method based on hard roof ground fracturing
A technology of collaborative control and hard roof, which is applied in ground mining, gas discharge, earth drilling and mining, etc., can solve problems such as unbalanced gas gushing and gas exceeding the limit, and achieve small production interference, high efficiency, and large crack expansion range Effect
Active Publication Date: 2021-04-09
DATONG COAL MINE GRP
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Problems solved by technology
This method not only solves the problem of strong mine pressure caused by large breaking steps of the hard roof, but also solves the problem of unbalanced gas gushing and gas exceeding the limit caused by large-scale breaking of the roof, which is conducive to ensuring safe and efficient mining of coal mines with hard roof conditions
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Embodiment Construction
[0016] The roof gas collaborative control method based on hard roof ground fracturing is realized by the following steps in sequence:
[0017] a. Mining the surface above coal seam 2 from working face 1, drilling vertically downward to the position of coal seam 2, taking cores from the overlying rock layers and testing their mechanical properties, and determining the positions of key layers overlying coal seam 2 according to the test results, According to the mining thickness of the coal seam 2, the key layer within a certain distance from the coal seam 2 is selected as the ground fracturing target layer 3, and the ratio of the distance between the selected fracturing target layer 3 and the coal seam 2 to the thickness of the coal seam is in the range of 3 to 7 ( For example, choose 3, 3.5, 4, 5, 6.5, 7);
[0018] b. Fracturing wells are used on the ground for fracturing. The projection of the vertical section 4 of the fracturing well is flush with the production stop line 5 o...
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The invention relates to an integrated prevention and control technology for roof gas in the mining of extra-thick coal seams on a hard roof, in particular to a collaborative control method for roof gas based on ground fracturing of a hard roof. Solve the problems existing in the roof and gas control of the extra-thick coal seam with the existing hard roof. The method is realized by the following steps in sequence: a. determining the fracturing target layer; b. using fracturing wells on the ground for fracturing; c. on the surface, arranging multiple microseismic detectors on both sides of the horizontal section of the fracturing well; d. .The microseismic detector monitors the extension length of the hydraulic fracture in the horizontal direction; e. Arranges the gas drainage equipment; f. Adjusts the gas drainage capacity of the gas drainage equipment. between 1%. The invention solves the problem of strong mine pressure caused by the large breaking step distance of the hard roof, and at the same time solves the problems of unbalanced gas gushing and gas exceeding the limit caused by large-area breaking of the roof.
Description
technical field [0001] The invention relates to an integrated prevention and control technology for roof gas in the mining of extra-thick coal seams on a hard roof, in particular to a collaborative control method for roof gas based on ground fracturing of a hard roof. Background technique [0002] Rock formation movement and control are at the heart of coal mining. The failure and instability of the rock formation has a direct impact on the mine pressure in the stope. In addition, the development of rock formation fissures and their structural characteristics are closely related to the gas enrichment and migration. Studies have also shown that the sudden break of the roof can easily cause instantaneous high gas gushing. The hard roof mining area accounts for one-third of my country's coal mines, and the extra-thick coal seam is the main coal seam for efficient mining in my country. When the hard roof extra-thick coal seam is mined, due to the large thickness of the coal seam...
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IPC IPC(8): E21F7/00E21C41/18E21B43/26E21B43/30
CPCE21B43/26E21B43/305E21C41/18E21F7/00
Inventor 于斌高瑞匡铁军夏彬伟
Owner DATONG COAL MINE GRP