Semi-overlapped bagging type gas drilling and sealing device

Abstract

The invention discloses a semi-overlapped bagging type gas drilling and sealing device, and aims to improve the gas extraction concentration, prevent the occurrence of underground coal mine gas accidents and improve the utilization efficiency of gas serving as clean energy. The gas drainage hole sealing body ventilation problem and the circular seam ventilation problem occurring between the sealing body and the drill hole wall and between the sealing body and the drainage pipe are solved. According to the technical scheme for solving the problem, two kinds of materials of a pouring type polyurethane expansion body contained in a flexible bag serve as power sources, a semi-overlapped sleeve bag formed by combining an inner bag and an outer bag serves as a main line, and a corresponding mechanism is arranged on the main line so as to control the expansion pressure of the sleeve bag and conduct the expansion pressure in a closed-loop mode.

Description

technical field [0001] When it comes to gas, people often think of gas accidents, especially vicious gas accidents. The harm to life and property is unacceptable to the whole society. On the other hand, gas, also known as coalbed methane, is a clean energy source. The invention relates to a semi-overlapping bagging type gas drilling and sealing device, which can prevent the occurrence of gas accidents, improve the gas collection capacity and utilization rate, and reduce the harm to the environment. Background technique [0002] Drilling, sealing and draining, in coal mines, especially in high gas mines, have always been the basic means and normalized work flow to prevent gas accidents. In these three links, sealing is the key. Blocking gas drainage holes is different from blocking ordinary holes and holes, and it is also a highly technical process. The level of sealing quality is directly related to the concentration of gas drainage. It is necessary to briefly describe t...

AI Technical Summary

Problems solved by technology

③ Both ends of the plugging section are open ends, and the injection type plugging is adopted, and the problem of "plugging" in the deep part of the plugging section needs to be solved, otherwise it will cause material to run out, and even the air inlet of the exhaust pipe will be blocked, resulting in Scrap hole

Under the calibrated negative pressure of 13 kPa, the air permeability causes gas circulation and channeling inside and outside the borehole, making it difficult to increase the concentration of gas drainage

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