Downhole sand fracturing system of coal mine

Abstract

The invention relates to a downhole sand fracturing system of a coal mine. The downhole sand fracturing system consists of a fracturing pump module, a power module, an electric control module, a cleanwater pump module, and a sand mixing module, wherein a plunger pump is arranged on the fracturing pump module; a hydraulic transmission and an explosion-proof motor are arranged on the power module,and the explosion-proof motor is used for driving the plunger pump through the hydraulic transmission; a centrifugal pump I, a centrifugal pump II and a clean water tank are arranged on the clean water pump module; a sand and water mixing pump, a stirrer, a sand conveyor and a sand hopper are arranged on the sand mixing module, and an output port of the sand and water mixing pump is connected withan input port of the plunger pump through a pipeline; a water outlet of the centrifugal pump II is connected with an input port of the plunger pump through a pipeline; the electric control module isused for respectively controlling the working of the centrifugal pump I, the centrifugal pump II, the sand and water mixing pump, the sand conveyor, the explosion-proof motor and the stirrer. The downhole sand fracturing system has the advantages that the downhole sand fracturing system consists of independent module units; the movement and transportation are convenient, the working efficiency offracturing is improved, and the labor intensity is decreased.

Description

technical field [0001] The invention belongs to the technical field of underground coal mine fracturing, and in particular relates to an underground coal mine sand-filling fracturing system. Background technique [0002] At present, most coal and gas outburst mines in China use underground coal mine fracturing pumps to increase permeability and fracture coal and rock in coal mines, thereby reducing coal and gas outburst accidents, but there are deficiencies in the fracturing process , that is, the pump unit uses clean water to perform fracturing during the fracturing process. After the fracturing is completed, the cracks generated by the fracturing are easy to close, which is not conducive to the release of gas along the cracks, affects the fracturing effect, and is inconvenient for later drainage. [0003] In order to implement the fracturing process of various coal and gas outburst mines, it is required to implement anti-permeability fracturing on rock mass and coal mass, ...

AI Technical Summary

Problems solved by technology

[0002] At present, most coal and gas outburst mines in China use underground coal mine fracturing pumps to increase permeability and fracture coal and rock in coal mines, thereby reducing coal and gas outburst accidents, but there are deficiencies in the fracturing process , that is, the pump group uses clean water for fracturing during the fracturing process. After the fracturing is completed, the cracks generated by the fracturing are easy to close, which is not conducive to the release of gas along the cracks, affects the fracturing effect, and is inconvenient for later drainage.

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