Detection and sealing integrated method and device for gas extraction drill hole

Abstract

The invention discloses a detection and sealing integrated method and a device for a gas extraction drill hole. A ruler on a detector is used for recording the distance from a hole mouth to the rear end of a coal crushing area, then detection is carried out in a fracture area instead of the coal crushing area, the position of a fracture is recorded when the first fracture is found, then the detection is continuously carried out inward, and gas extraction begins; when concentration of the gas extraction is less than 16%, second hole sealing is carried out, the fracture is blocked from inward to outward, powder materials are conveyed into a sealing cavity through a feeding pipe, then the powder materials stop being conveyed, gas in a gas bag is released, and sealing stops until the air bag moves to the coal crushing area; and positions of the coal crushing area and the fracture area can be accurately located when the second hole sealing is finished, and therefore the range of a first hole sealing section and the range of a second hole sealing section can be reasonably arranged, the problems that the gas leaks due to unscientific arrangement of the first hole sealing section and the like are solved, and the defect that the powder materials are wasted due to powder material conveying in the coal crushing area by means of a traditional method is overcome. The method is convenient to operate, and good in fracture blocking.

Description

technical field [0001] The invention relates to a plugging method for gas drainage boreholes. Background technique [0002] Gas disasters seriously threaten the safe production of coal mines, and gas drainage through drilling is the fundamental measure to control gas disasters. However, there are air leakage fissures in the drilling area, and air enters the borehole through the fissures, which seriously affects the gas drainage effect. [0003] The Chinese patent specification discloses the "Secondary Sealing Method for Increasing the Concentration of Gas Drainage in Coal Seam Boreholes" (Patent Application No. 200810023609.5). [0004] Excavating the roadway will make the coal on the wall of the roadway loose and broken. If the powder is transported within the loose and broken range, the powder will be blown out of the coal wall. The above-mentioned patented technology has the following disadvantages: when the first hole sealing is performed, the position of the crack are...

AI Technical Summary

Problems solved by technology

The above-mentioned patented technology has the following disadvantages: when the first hole sealing is performed, the position of the crack area is not detected, and the primary sealing section may be set in the crack area by mistake, resulting in serious air leakage in the drill hole; when the second hole sealing is performed, it may be Conveying powder to the coal crushing area, resulting in waste of powder; blindly conveying powder to a large space, not targeted, the required conveying pressure is high

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