Fixed sealing hole and leaking stoppage integrated device for gas extraction

Abstract

The invention discloses a fixed sealing hole and leaking stoppage integrated device for gas extraction. The fixed sealing hole and leaking stoppage integrated device comprises a perforated pipe, firstsecond pouches and a second pouch, and the perforated pipe comprises a first channel, a second channel, a third channel and a fourth channel, wherein the first channel, the second channel, the thirdchannel and the fourth channel are parallel to each another. The first pouches and the second pouch comprise pouch bodies and pouch openings, first one-way valves are arranged at the positions, in thepouch bodies of the first pouches, on the perforated pipe, and first openings are formed in the perforated pipe. A second one-way valve is arranged on the outer side of the middle of the pouch body of the second pouch, a third one-way valve and a fourth one-way valve are arranged on the positions, on both sides of the middle of the pouch body of the second pouch, on the perforated pipe, a third opening and a fourth opening are formed in the perforated pipe separately, wherein the third opening communicates with the first channel and the third one-way valve, and the fourth opening communicateswith the first channel and the fourth one-way valve. The perforated pipe is provided with a one-way pressure control valve and slurry guiding holes. The fixed sealing hole and leaking stoppage integrated device for the gas extraction has the advantages that secondary grouting pressure maintaining ability is enhanced to realize multiple sections of grouting for leaking stoppage, at the same time,the fixed sealing hole and leaking stoppage integrated device for the gas extraction is simple in structure and is convenient for underground construction operations.

Description

Technical field [0001] The invention relates to the technical field of coal mining equipment, in particular to an integrated device for gas drainage fixed plugging and plugging. Background technique [0002] Underground gas pre-drainage can achieve the dual purpose of disaster prevention and unconventional natural gas extraction, but this requires high-quality sealing of coal seam boreholes. Poor sealing quality of gas drainage boreholes will directly lead to gas leakage in the borehole, causing the borehole concentration to rapidly decay. Even if the quality of the initial sealing of the borehole is good, under the continuous action of ground stress, the borehole will have air leakage cracks, which will reduce the concentration of the borehole rapidly. Several commonly used sealing techniques are polyurethane sealing method, two plugging and one injection sealing method, and bladder sealing method. The polyurethane sealing method has many problems and has been gradually replac...

AI Technical Summary

Problems solved by technology

There are many problems in the polyurethane sealing method, which has been gradually replaced by better technologies; the two-blocking-one-injection sealing method using polyurethane plugging and inorganic material grouting is complicated to operate, and the sealing depth is difficult to effectively control

Moreover, neither of the first two sealing technologies can perform secondary sealing on the drilled hole

The patent number is ZL201310405906.7; the invention patent of ZL201320552836.3 discloses three-bag grouting and sealing equipment. Although good application results have been achieved, there are also problems with secondary grouting that do not maintain pressure and the length of the sealing hole is limited. The problem

The defects of the above existing technologies have resulted in poor sealing quality of underground gas drainage and unstable drainage concentration

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