Coal bed screw rod water injection device and water injection method

Abstract

The invention discloses a coal bed screw rod water injection device and a water injection method. A lining sleeve is arranged in a housing, a rotatable water injection screw rod is arranged in the lining sleeve, a threaded cavity is formed in part, corresponding to the water injection screw rod, of the lining sleeve, the threaded cavity fits the water injection screw rod, the housing is connectedwith a water injection pipe, an expanding hole sealing rubber pipe is arranged in the outer circumference of the part, where the lining sleeve and the water injection pipe is connected, of the housing, the expanding hole sealing rubber pipe is communicated with a water supplying pipe, a one-way overflowing device is arranged on the part, located at the front end of the lining sleeve, of the housing, the one-way overflowing device is communicated with the threaded cavity, and a positioning plate used for positioning is arranged at the back of the one-way overflowing device. According to the device, sealing between water injection drilling holes is achieved by using the expanding hole sealing rubber pipe, the water injection screw rod is driven to operate by hydraulic pressure to absorb liquid, water is pushed to be stably and uniformly transferred in the axial direction to constantly exert fluctuating water pressure on coal bed gaps to increase the seepage performance and water injection amount of coal beds, the yield is high by using an expanding rubber pipe to seal the holes, the device can be taken out after water injection is completed, and therefore recycling utilization is achieved.

Description

technical field [0001] The invention relates to the field of coal seam water injection, in particular to a coal seam screw water injection device and a water injection method. Background technique [0002] The coal dust produced in the coal mining process not only makes the operators who have been working in this environment for a long time suffer from occupational pneumoconiosis, but also brings heavy economic burden and mental pain to the operators and their families; Or participate in the explosion, which poses a great threat to the personal safety of workers and mine safety. It is an effective technical measure to solve this problem by pre-wetting the coal body with water injection to make it reach a better wet state before mining. With the deepening of coal mining in my country, the degree of coal metamorphism increases, the permeability decreases, and the difficulty of coal seam water injection is also increasing. The existing coal seam water injection methods and coa...

AI Technical Summary

Problems solved by technology

With the deepening of coal mining in my country, the degree of coal metamorphism increases, the permeability decreases, and the difficulty of coal seam water injection is also increasing. The existing coal seam water injection methods and coal seam water injection pumps have been difficult to achieve water injection in low-permeability coal seams.

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