Pneumatic device for repairing gas extraction efficacy losing drilling

Abstract

The invention relates to a pneumatic device for repairing gas extraction efficacy losing drilling, and belongs to the technical field of coal mine gas extraction. The device comprises a pneumatic highpressure water pump set, a drilling repairing handheld device and a high pressure repairing pipeline in a drilling hole. An air inlet end of the pneumatic high pressure water pump set is connected with an underground pressure ventilation pipeline, and a water inlet end of the pneumatic high pressure water pump set is connected with an underground water supply pipeline. A high pressure water output end of the pneumatic high pressure water pump set is connected to the drilling repairing handheld device through a high pressure hose, the drilling repairing handheld device is connected to one endof the high pressure repairing pipeline, and the other end of the high pressure repairing pipeline is connected to a drilling repairing spraying head. The pneumatic device achieves the purposes that underground operation of a coal mine is simple and convenient, and efficacy losing drilling is rapidly repaired, in addition, hole protection through a sieve pipe is conducted synchronously in the repairing process of efficacy losing drilling, the technical effects of repairing of efficacy losing drilling and hole protection of drilling can further be achieved, and the problem of efficacy losing caused by hole collapse, diameter shrinkage, coal cinder accumulation and the like in the gas extraction and drilling process is thoroughly solved.

Description

technical field [0001] The invention belongs to the technical field of gas drainage in coal mines, and relates to a pneumatic gas drainage failure drilling repair device. Background technique [0002] Underground gas drainage in coal mines in my country started earlier, especially in recent years, with the continuous development of coal mine gas drainage technology and equipment, it has developed from the initial simple guarantee of coal mine safety production to a new stage of comprehensive development integrating coal mining and gas extraction. However, borehole gas extraction is still the main method of gas extraction in underground coal mines, and it is also a fundamental measure to control coal and gas outburst in coal mines, which can effectively reduce mine gas gushing. [0003] Due to the complex and changeable geological conditions of coal seams in my country, during the construction of drainage boreholes, because the strength of coal bodies is smaller than that of ...

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Problems solved by technology

[0003] Due to the complex and changeable geological conditions of coal seams in my country, during the construction of drainage boreholes, because the strength of coal bodies is smaller than that of rock formations, especially soft and broken coal seams, affected by factors such as in-situ stress, gas content, and coal body strength, drainage boreholes Hole collapse, diameter shrinkage, cinder accumulation, etc. are common; in addition, the stress changes around the borehole caused by mining activities will cause the displacement and deformation of the coal around the borehole, which will further cause the mining collapse after the borehole is formed, and eventually lead to pumping. Borehole plugging

[0004] After the gas drainage boreholes are blocked by collapsed holes and cinders, etc., the channels for gas gushing out and flowing are blocked, the original normal flow channels of gas in the boreholes are changed, and the flow of gas in the boreholes is blocked, and eventually Caused borehole failure, resulting in a short drainage drilling service cycle, seriously affecting the efficiency of gas drainage, resulting in a long time for drainage to reach the standard and uneven regional drainage effects, limiting the smooth connection of drainage and mining in high gas and outburst mines. Coal mine safety production leaves safety hazards

[0005] Aiming at the problem of borehole failure caused by the collapse and blockage of drainage boreholes, coal mine sites usually use methods such as blowing holes with compressed air and digging holes. The application effect is not obvious, and even lead to more serious hole collapse and blockage.

Chinese patent literature CN 106437521A announced "A Downhole Self-advancing High-Pressure Abrasive Gas Jet Drilling Repair Device and Method", CN 205477467U "A Self-advancing Rotating Gas Jet Repairing Gas Drainage Drilling Device" introduces the use of high-pressure The gas jet is used for borehole repair, but when there is water in the borehole, dredging and slagging cannot be effectively carried out; Chinese patent document CN201210489910.1 "Drilling, anti-reflection, repair and gas drive replacement of underground coal mine boreholes" "Comprehensive Method" introduces the mode of "temporary hole sealing, reasonable negative pressure, and cyclic repair", but the process operation is complicated and the repair efficiency is low. Using coiled tubing as the high-pressure water delivery pipeline cannot effectively repair the borehole with a large inclination angle. Borehole repair equipment is complex and heavy in structure, and there are many attached equipment, which is not conducive to the rapid repair of boreholes; in summary, there are many problems in the existing gas drainage failure borehole repair methods, which cannot effectively solve the problems of drainage borehole collapse, Drilling failure repair problem caused by hole plugging

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