液态CO_2相变致裂强化瓦斯预抽试验研究  

Experiment research on strengthening gas drainage effect with fracturing technique by liquid CO_2 phase transition

作　　者：王兆丰[1] 孙小明[1] 陆庭侃[2] 韩亚北 

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454000 [2]河南理工大学能源科学与工程学院,河南焦作454000

出　　处：《河南理工大学学报（自然科学版）》2015年第1期1-5,共5页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家重点基础研究发展计划"973"项目(2006CB202204);国家自然科学基金资助项目(51274090150974056)

摘　　要：针对单一低透气性煤层瓦斯含量高、预抽效果不理想的情况,采用液态CO2相变致裂技术,在穿层钻孔中利用瞬间产生的高压CO2气体冲击煤体,产生大量裂隙并促使裂隙发育、扩展,以达到提高煤层透气性的目的。在河南焦煤能源有限公司九里山16051底抽巷进行的试验表明:液态CO2相变致裂技术可有效提高瓦斯抽采效果,试验后平均抽采流量0.057 m3/min,是试验前平均流量的4.3倍,是相同抽采时间内水力冲孔措施平均抽采流量的2.3倍;抽采体积分数也有所提升;在试验考察期内流量衰减系数降低到0.046 d-1,增透效果显著。For the condition of high gas content and unsatisfactory gas pre-drainage effect in a single low per- meability coal seam, the fracturing technique by liquid CO2 phase transition was adopted, and the instantane- ous high pressure CO2 jet to impact the coal in the boring to produce a large number of promoted and expanded fracture was utilized in a coal seam, so as to make the permeability developed eventually. Through the experi- ment in 16051 floor roadway of Jiulishan Mine, it showed that the effect of gas drainage was improved obvious- ly by the fracturing technique with liquid CO2 phase transition. The average gas flow turned to be 0. 057 m^3/min after experiment, which was 4.3 times of the flow before fracturing measures, and was 2.3 times of the flow by using the hydraulic flushing. The gas concentration also had been enhanced. During the test, the flow attenua- tion coefficient decreased to 0. 046 d^-1. The research results indicated that anti-reflection effect is remarka- ble.

关 键 词：单一低透气性煤层 液态CO2 致裂技术 增透 

分 类 号：TD713[矿业工程—矿井通风与安全]