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Research and Application of Hydraulic Flushing Improving Permeability and Relieving Pressure Technology

Author: RenPeiLiang
Tutor: YangXiaoLin；LiuMingJu
School: Henan Polytechnic University
Course: Engineering Mechanics
Keywords: Coalbed Gas Hydraulic flushing Water Jet Outburst prevention mechanism
CLC: TD713.34
Type: Master's thesis
Year: 2009
Downloads: 62
Quote: 5
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Abstract


Hydraulic punching outburst prevention measures during before CROSSCUTTING coal or mining work, the use of high-pressure water jet, discharged a large amount of gas and a certain amount of coal in the the outburst danger seam, out of a number of large diameter holes, punching process , certain relief, emission gas region is formed in this region, can prevent the occurrence of projecting in the coal body. The hydraulic punching process is a high-pressure jet of broken coal release large amounts of gas, change the stress state of coal process. The destruction of the coal First of broken coal is a high-pressure jet of high-energy, the formation of smaller diameter bore holes around coal is broken, then the role of coal gas pressure gradient and residual jet energy reflected holes further expand. In order to investigate the hydraulic flushing relief antireflection effect outburst prevention measures, and determine the effective radius of influence. Through theoretical calculation the actual punching of the multi-nozzle into a equivalent diameter of the nozzle, and then combined with the pressure loss of the piping calculated draw nozzle at the outlet of the jet pressure, the theoretical calculations of the striking force of the water jet and the compressive strength of the coal The comparative analysis of the obtained theoretical striking force coal-breaking. And on-site visits by the Mine in Huainan Coal Mining Group Pan Pan second mine, Pansan mine and Xieqiao mine several mine tested hydraulic punching outburst prevention measures, by changing punching water pressure, the drilling angle combined RFPA numerical simulation software for different vertical pressure, different pore size, measured the different hydrostatic and simulation of of Panyi hydraulic punching as well as on-site visits the of punching before and after the gas pressure in the borehole gas flow, roadway Gas Emission cuttings Gas Desorption Index and binding on borehole gas drainage: ① water pressure out of the amount of coal is not proportional to the broken coal must be greater than the critical pressure, achieve the broken coal valid pressure test results show that the broken coal critical pressure Huainan mining area around 10f , breaking coal effective pressure for 12f to 20f; the ② broken coal pressure coal speed is related, but not in order to improve the broken coal speed increased too much water pressure, hydraulic punching broken coal pressure reached breaking coal on the basis of the pressure should not increase too much, otherwise the shelter Bie holes, buried drill, and the effective range of the jet is reduced while affecting the total amount of coal is increased; ③ punching time and the amount of coal is, to ensure hydraulic punching time; ④ positive angle drilling hydraulic punching effect is better than negative angle drilling. Huainan the several mining area of ??a large number of hydraulic punching test, summed up the relationship between the technical parameters of the hydraulic flushing, the establishment of the relationship between these technical parameters, not only fragmented hydraulic punching test systematic, and its After finishing these scattered data to identify implicit in the law subsequent theorizing, not only to optimize the technical parameters of the hydraulic punching and provide technical support for the design of the hydraulic flushing program.

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CLC: > Industrial Technology > Mining Engineering > Mine safety and labor protection > Mine atmosphere > Coal (rock) and gas outburst prevention and treatment > Prominent preventive measures > Hydraulic flushing
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