Roof and gas cooperative-control method based on hard roof ground fracturing
A collaborative control, hard roof technology, applied in gas discharge, ground mining, earth-moving drilling, etc., can solve the problems of gas overrun, unbalanced gas gushing, etc., and achieves low production interference, reduced strength, and wide application prospects. Effect
Active Publication Date: 2019-07-30
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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[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 a roof and gas integrated prevention and control technology for hard roof super-thick coal seam mining, in particular to a roof and gas cooperative-control method based on hard roof ground fracturing. The problem existing in roof and gas control for hard roof super-thick coal seams is solved. The method is implemented sequentially through the following steps that a, a fracturing target layer is determined; b, a fracturing well is adopted on the ground for fracturing; c, on the ground surface, a plurality of microearthquake wave detectors are arranged on the two sides of a horizontal section of the fracturing well; d, the microearthquake wave detectors monitor the extension length of a hydraulic fracture in the horizontal direction; e, gas extraction equipment is arranged; and f, the extraction amount of the gas extraction equipment is adjusted, and the gas concentration monitored by gas sensors at the two ends of a downhole working face is within 0.6% to 1%. The difficult problem of high mine pressure caused by large breaking span of a hard roof is solved, and meanwhile, the difficult problems of unbalanced gas outflow and transfinite gas caused by large-area breaking of the roof are solved.
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