The Rapid Gas Drainage Technology Reaearch On Increase Coal Gas Permeability By Vapor Hpase Fracturing In Gaohe Coal Mine

The core technology of AR vapor fracturing strengthen for gaw drainaing rapidly is the use of carbon dioxide-induced cracking unit(carbon dioxide extraction unit)instantly generate high pressure in coal seam gas effect,re-open the original coal cleat and fracture systems. By changing the high pressure blasting coal matrix pore structure characteristics, greatly improve seam permeability and permeability, improve gas drainage concentration, pure gas flow, drainage rate and pumping rate.Systematic study of Gao he caol mine No.3 coal seam gas drainage situation and geology of this paper. The site of 1305 were developed three different test programs,and industrial test done. The entire site gas drainage during the test parameters comprehensive monitoring and analysis, study of gas-phase fracturing AR strengthen the effect of extraction, concentration focused on gas drainage and gas drainage net traffic. Test a total of about outcomes:1.Test drilling gas drainage concentration was increased from 15% of normal drilling to more than 50 percent, more than three times. Hole gas drainage volume increased from 14m3/d before the test to 150 ~ 278m3/d or more, increased by 10 to 20times。2. fracturing drilling drainage area of 210 days after the test, the gas content of the original 11.73m3/t reduced to 6.5m3/t, pumping rate up to 45%, to achieve the goal of rapid extraction technology and comprehensive management of gas.3. The core technology of AR vapor fracturing strengthen for gaw drainaing rapidly is a new coal mine gas control technology, which can substantially increase the concentration of gas drainage, gas drainage and drainage net flow rate, rapid reduction seam gas content and gas pressure,while allowing coal to stress redistribution, eliminate stress locally concentrated state, played eliminate sudden effect, so high gas outburst coal seam gas goes low, safety mining.