低透气煤层高压气水混压增透驱替瓦斯技术研究  

Research on gas displacement technology of permeability enhancement with high-pressure gas-water mixed pressure in low permeability coal seam

作　　者：朱传杰[1] 刘思远 伍厚荣[2] 刘厅[1] 殷绍林 成艳英[2] 李连云[2] 王小兵 刘谦[4] Zhu Chuanjie;Liu Siyuan;Wu Hourong;Liu Ting;Yin Shaolin;Cheng Yanying;Li Lianyun;Wang Xiaobing;Liu Qian(School of Safety Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Sichuan Coal Industry Group Limited Liability Company,Chengdu,Sichuan 610091,China;Lvshuidong Coal Mine,Sichuan Huayingshan Coal Industry Co.,Ltd.,Huaying,Sichuan 638601,China;School of Resource Engineering,Longyan University,Longyan,Fujian 364012,China)

机构地区：[1]中国矿业大学安全工程学院,江苏省徐州市221116 [2]四川省煤炭产业集团有限责任公司,四川省成都市610091 [3]四川省华蓥山煤业股份有限公司绿水洞煤矿,四川省华蓥市638601 [4]龙岩学院资源工程学院,福建省龙岩市364012

出　　处：《中国煤炭》2020年第12期61-67,共7页China Coal

基　　金：国家自然科学基金项目(51874293、11531010);国家重点研发计划(2018YFC0807905)。

摘　　要：针对煤体纳米级孔隙内瓦斯难以解吸抽采的难题,首次提出了低透气煤层高压气水混压增透驱替瓦斯技术,研究指出高压气水混压增透驱替原理主要包括压裂裂隙的形成、水分竞争吸附置换瓦斯和高压空气驱替提高运移效率并解堵3个核心部分。研发了高压气水混压增透驱替瓦斯技术配套工艺及装备。在绿水洞煤矿K1煤层进行了现场试验,试验结果表明:矿井的平均单孔瓦斯抽采纯量从2.43 L/min提高到6.45 L/min,增加了2.65倍,平均抽采浓度从31.3%提到47.6%,增加了16.3%,煤层瓦斯含量降低了25.14%~80.62%,取得了显著的效果。Aiming at the difficult problem of gas desorption and drainage from nanopores of coal,the gas displacement technology of permeability enhancement with high-pressure gas-water mixed pressure in low permeability coal seam was put forward for the first time.It was pointed out that the principle of permeability enhancement and gas displacement with high-pressure gas-water mixed pressure mainly included three core parts,i.e.fracture formation,water competitive adsorption for gas replacement,high-pressure air displacement for improvement of migration efficiency and plug removal.The matching technology and equipment of gas displacement of permeability enhancement with high-pressure gas-water mixed pressure were developed.The field test was carried out in K1 coal seam of Lvshuidong Coal Mine,and the test results showed that the average gas drainage pure quantity of single hole increased from 2.43 L/min to 6.45 L/min,increased by 2.65 times,and the average drainage concentration increased from 31.3%to 47.6%,increases by 16.3%,and the gas content of coal seam increased by 25.14%-80.62%,which had achieved remarkable results.

关 键 词：低透气煤层 压裂 驱替 瓦斯含量 抽采浓度 

分 类 号：TD712.6[矿业工程—矿井通风与安全]