Abstract
By law mining fracture morphology analysis, based on coal face gas flow characteristics, obtain the L-shaped surface well layout area in the mining area under the influence of mining. Analysis of overlying strata "three zones" distribution, the calculation method of the height of overburden rock "three zones" designed in mining area ground well structure proposed safety drainage system construction plan. In Sihe Mine was L-shaped ground mining area well engineering practice, the average gas production at a concentration of 80%, with an average drainage net amount 22 000 m3 / d, a total of more than 300 days running, drainaging 6.5 million CBM m3. After the implementation of drainage work surface corner gas content fell 46.5%, to effectively improve production efficiency, for the surface treatment gas play a key role. Successfully removed Mining Face Gas for safe production constraints, to protect the mining of coal mine safety, and achieved good social and economic results, with good promotional value.
Highlights
At present, some domestic coal mines are faced with the confusion of high difficulty and high pressure of gas control in the working face
After long-term exploration and research by researchers, the purpose of using surface wells in mining affected areas to control gas overrun in the upper corner of coal face has been basically achieved [4,5].Zhang[6] et al presented that the coal mine gas is a high-quality clean source of energy and a good industrial, chemical, power generation and residential fuel
Zhou[7] et al presented that the coalbed methane drainage is quite important for the safe production in coal mines and the utilization of gas resources.It is proven significantly important to study the coalbed methane drainage in the mining area
Summary
Some domestic coal mines are faced with the confusion of high difficulty and high pressure of gas control in the working face. Surface coalbed methane wells can alleviate the pressure of gas control in coal mines [1,2,3]. After long-term exploration and research by researchers, the purpose of using surface wells in mining affected areas to control gas overrun in the upper corner of coal face has been basically achieved [4,5].Zhang[6] et al presented that the coal mine gas (coalbed methane) is a high-quality clean source of energy and a good industrial, chemical, power generation and residential fuel. In order to achieve the purpose of wide coverage and excellent gas drainage effect, so as to improve the gas drainage efficiency, alleviate the gas control pressure of the mining face, reduce the gas overrun risk of the mining face, and enhance the safety guarantee of high yield and high efficiency of the coal mine. Horizon analysis of horizontal section of L-shaped surface well in mining area
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