Co-mining method of coal and contact co-existing oil shale fracturing

Abstract

The invention discloses a method for fracturing co-mining of coal and contact co-existing oil shale. A row of parallel fracturing drilling holes is constructed obliquely forward at the co-mining working face close to the roof of the coal seam, and the fracturing drilling holes penetrate through the coal seam above the coal seam. The oil shale is directly topped and extended to the upper old top rock layer, and the pulse fracturing system is set to generate a pulse fracturing fracture network in the direct top oil shale, and the constant displacement directional fracturing system generates directional hydraulic fractures in the old top rock layer. A rock outlet is set at the tail beam of the common mining bracket, and the coal cut by the shearer is transported through the front scraper conveyor; the directly top oil shale that has collapsed after the erection is released from the rock outlet and transported through the rear scraper conveyor. The present invention proposes the idea of ​​"directly topping oil shale pulse fracturing fracture + Laoding directional fracturing to induce ore crushing rock" to control the fracturing weakening of coal seam direct top oil shale, fully break the direct top oil shale, and significantly improve the upper layer The release property of oil shale reduces the lumpiness of oil shale and meets the requirement of lumpiness released from the rock outlet behind the shelf.

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 ...

AI Technical Summary

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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