Fracturing co-mining method for coal and contact symbiotic oil shale

Abstract

The invention discloses a fracturing co-mining method for coal and contact symbiotic oil shale. The fracturing co-mining method comprises the following steps that a row of parallel fracturing drill holes are obliquely constructed forwards in a co-mining working face close to a coal seam roof, the fracturing drill holes are enabled to penetrate through immediate roof oil shale above a coal seam and extend into an upper roof rock stratum above the coal seam, a pulse fracturing system is arranged to generate a pulse fracturing fracture net on the immediate roof oil shale, and a constant-displacement directional fracturing system is arranged to generate directional water pressure fractures on the upper roof rock stratum; a tail beam of a co-mining support is provided with a rock discharging opening, and coal cut by a coal mining machine is conveyed through a front scraper conveyor; and the collapsed immediate roof oil shale behind the support is discharged from the rock discharging opening and is transported through a rear scraper conveyer. The coal seam immediate roof oil shale fracturing weakening control thought of immediate roof oil shale pulse fracturing crushing and upper roof directional fracturing induced mine pressure rock breaking is provided, the immediate roof oil shale is fully crushed, the caving property of upper-layer oil shale is remarkably improved, the caving lumpiness of the oil shale is reduced, and the lumpiness requirement of releasing from the rock discharging opening behind the support is met.

Description

technical field [0001] The invention relates to the technical field of mining, in particular to a method for co-mining coal and contact paragenetic oil shale fracturing. Background technique [0002] Among the large number of proven mineral deposits in China, there are relatively few deposits of a single type of mineral, and most of them have one or more associated minerals. Coal measures, also known as coal-bearing strata and coal-bearing formations, are a set of sedimentary rock series that contain coal seams and are genetically related. Coal-measure mineral resources refer to all mineral resources that are genetically linked in coal-bearing strata, including coal and coal-measure associated minerals. Traditional coal mines only exploit coal resources, with little or no consideration for the coal-measure associated mineral resources, resulting in a huge waste of mineral resources. Especially for the situation where another kind of mineral resource directly exists in the ...

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Problems solved by technology

[0007] In view of the conflicts of mutual influence and waste of resources in the independent mining of coal and contact symbiotic oil shale, as well as the problem of timely and sufficient fragmentation of oil shale during co-production, the present invention proposes a co-fracturing method for coal and contact symbiotic oil shale. The mining method adopts a common mining hydraulic support, and the tail beam of the support is equipped with a rock opening, and it is equipped with two scraper conveyors. The coal cut by the coal shearer is transported through the front scraper conveyor; Released from the rock opening and transported by the rear scraper conveyor

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