液态CO_2相变致裂增透技术在高瓦斯低透煤层的应用  

Application of permecbility improvment technology with liquid CO_2 phase transition fracturing to high gassy and low permeability seam

作　　者：赵龙[1] 王兆丰[1,2] 孙矩正 涂冬平 

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454003 [2]河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地,河南焦作454003 [3]中国平煤神马集团能源化工研究院,河南平顶山467000 [4]平顶山天安煤业股份有限公司十三矿,河南平顶山467000

出　　处：《煤炭科学技术》2016年第3期75-79,共5页Coal Science and Technology

基　　金：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)

摘　　要：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CO_2相变致裂技术进行强化抽采,试验研究了液态CO_2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CO_2相变致裂技术,利用专门的液态CO_2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 gassy low permeability status of the seam in No. 13 Mine of Pingdingshan Tian＇an Coal Company and in order to improve the gas drainage volume of the mine,the liquid CO2 phase transition fracturing technology was applied to the enhanced gas drainage. The experiment study was conducted on the permeability improved mechanism and the outburst elimination and permeability improved effect of the liquid CO2 phase transition fracturing technology in the high gassy and low permeability seam. With the liquid CO2 phase transition fracturing technology applied to the floor drainage gateway of the Ji15.17- 11111 transportation roadway,the special liquid CO2 phase transition fracturing device applied could make a fracturing explosion during the bed crossing borehole,could make the cracks around the coal mass,could make the permeability coefficient increased of the seam.The experiment result showed that,the average drainage concentration from a single gas borehole was 1.42 times higher than before the experiment. A daily average drainage pure volume from a single gas borehole was 2.17 times higher than before the experiment. 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 effectively improved.

关 键 词：低透气性煤层 液态CO2 相变致裂 穿层钻孔 抽采纯量 

分 类 号：TD712[矿业工程—矿井通风与安全]