School of Safety Science and Engineering,Henan Polytechnic University Henan Provincial Key Lab of GasGeology and Gas Control - Cultivation Base,Provinces and Ministry Joint Established State Key Lab ResearchInstitute of Energy and Chemical lndustry,China Pingmei Shenma Group No.13 Mine,Pingdingshan Tian'an Coal Company Limited

针对平煤十三矿煤层的高瓦斯低透气性现状,为了提高矿井的瓦斯抽采量,采用了液态CO2相变致裂技术进行强化抽采,试验研究了液态CO2相变致裂技术在高瓦斯低透气性煤层中的增透机理和消突增透效果。通过对己15.17-11111运输巷底抽巷采取液态CO2相变致裂技术,利用专门的液态CO2相变致裂装置,在穿层钻孔中致裂爆破,可以使周围煤体产生裂隙,煤层透气性系数增大,试验结果表明:单孔瓦斯平均抽采体积分数是试验前的1.42倍,单孔瓦斯日平均抽采纯量是试验前的2.17倍,抽采衰减周期至少延长2倍以上,可有效提高煤层瓦斯预抽效果。

According to the high gasy low permeablity status of the seam in No.13 M.ine of Pingdingshan Tian an Coal Company and in orer to improve the gas drainage volume of the mine,the liquid Co _2 phase ransitin fracturing techinology was apled to the enmhanced gas drainage.The experimen stcdy was conduced on he permeabilityimproved mechanism and the outburst elinination and pemeability improved efiect of the licuid co 2 phase rnstion fracturing echmogy in the highgassy and low permeability sean. Wirth the liquid co _2 phasetrnstin fracturing technology appid to the foor drainagegateway of th Ji15.17-1111 tansportationroadwaythe special licuid cO_2 phase ransition fracturing device appied could make a frcturing explosion during the bed crossing borehole,could make the cracks around the coal mass could make the permeability coicient increased of the seam.The experinent resut howed thathe average drainage concentration fom a singlegas borehole was 1.42 times igherthan betore the experiment. A daly average drainage pure volume from a single gas borehole was 2.17 times higher than before the experinent.The attenuation period of the gas drainage was expanded over two times at least and the pre-drainage effect of the seam gas could be effectiv ly improed.

国家自然科学基金资助项目(51274090)；河南省协同创新资助项目(15131319)；