A method and device for improving the efficiency of drilling gas drainage

Abstract

The invention discloses a method for improving drilling gas extraction efficiency. According to the method for improving the drilling gas extraction efficiency, on the basis that a series of gas extraction holes are formed according to a traditional gas extraction method, a controllable pulse vibration device is arranged in a gas control roadway above a target coal bed, wherein the distance between the target coal bed and the gas control roadway ranges from 15 meters to 30 meters, and the controllable pulse vibration device is small in occupied space and intrinsically safe, and has controllable energy; pulse impact vibration is carried out on the controllable pulse vibration device, and acts on a roof arranged above the target coal bed to be mined. Due to the fact that pulse vibration is applied to the roof arranged above the target coal bed to be mined, corresponding pulse impact is borne by a coal body of the target coal bed, extension of an original crack in the coal body is facilitated, a new crack channel is generated, gas in the coal body can move more smoothly, a large amount of adsorbed gas in the coal body is converted into free gas, desorption, diffusion and flow of the gas from micropores are accelerated, and the drilling gas extraction efficiency is greatly improved. According to the test result, by the adoption of the method for improving the drilling gas extraction efficiency, the gas extraction efficiency can be improved by about 400%.

Description

technical field [0001] The invention relates to a method for improving the gas extraction efficiency of boreholes, in particular to a method and a device for improving the gas extraction efficiency of boreholes by using controllable pulse vibration for target coal seams to be mined. Background technique [0002] All regions of the country are plagued by smog to varying degrees and the environmental pressure is increasing. The country pays more and more attention to the utilization of coalbed methane. At the same time, coal mining enterprises are concerned about the extraction and utilization of coalbed methane under the premise of considering their own production safety needs. It is more urgent and important. Coal and gas are a solid-gas two-phase medium with complex material composition and ever-changing conditions of occurrence. Coal and gas are in a state of dynamic equilibrium under natural conditions. At present, the coalbed methane extraction method in mines around th...

AI Technical Summary

Problems solved by technology

At present, the coalbed methane extraction method in mines around the world is still the traditional simple method: that is, densely drill holes in the coal body and extract them through negative pressure, which requires a lot of manpower and material resources to drill the holes. After the holes are formed, due to the ventilation of the coal body Low performance, poor gas drainage effect, low drainage efficiency, often time-consuming, time-consuming and laborious, and can not meet the requirements of drainage

It takes half a year to one year for general working face extraction, and sometimes it takes longer, which seriously affects the safety production of coal mining enterprises and restricts the economic benefits and production progress of the enterprise. Therefore, a safe and effective method is urgently needed to improve the extraction efficiency so that Reduce the cost of coal gas drainage

[0003] At present, there are still few technical methods for improving the efficiency of gas drainage in underground roadways, and even fewer results have been put into practical application, which are far from meeting the needs of gas drainage development.

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