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低渗透性煤层注液态CO2置换驱替CH4试验
马砺1,2, 魏高明1,2, 王世斌3, 李珍宝1,2, 刘新民3
1.西安科技大学 西部矿井开采及灾害防治教育部重点实验室, 西安 710054;2.西安科技大学 安全与科学工程学院, 西安 710054;3.韩城矿务局, 陕西 韩城 715400
摘要:
针对低渗透性煤层瓦斯难以抽采的问题,结合液态CO2低温、低黏、渗流阻力小、相变增压等特性,提出低渗透性煤层注液态CO2置换驱替CH4技术。在韩城矿区桑树坪二号井开展煤层注液态CO2置换驱替CH4工业性试验,开发了压注工艺系统,确定了压注关键性参数,判定了CO2置换驱替CH4技术效果。试验结果表明:液态CO2压注时压力呈现波动特性,起始升压速率较快,达到2.5 MPa左右时趋于稳定;压注管路瞬时流量为0.6~1.4 m3/h,累计压注液态CO2为6.0 m3;以压注过程中检验孔内CO2体积分数为指标,判定试验有效影响半径达到18 m。试验区域瓦斯抽采体积分数是原始体积分数的2.5倍,抽采纯量是原始纯量的3.5倍,相比瓦斯抽采效率提高。
关键词:  低渗透性煤层  液态CO2  影响半径  瓦斯抽采  置换驱替
DOI:10.11835/j.issn.1000-582X.2018.06.009
分类号:
基金项目:国家自然科学基金资助项目(51574193,51504186)。
Experimental study of displacing & replacing methane in low permeability coal seam by injecting liquid carbon dioxide
MA Li1,2, WEI Gaoming1,2, WANG Shibin3, LI Zhenbao1,2, LIU Xinmin3
1.College of Energy Science & Engineering, Xi'an University of Science and Technology, Xi'an 710054, P. R. China;2.Key Laboratory for Coal Exploitation and Disaster Prevention under Ministry of Education, Xi'an University of Science and Technology, Xi'an 710054, P. R. China;3.Hancheng Mining Bureau, Hangcheng 715400, Shaanxi, P. R. China
Abstract:
This paper is to solve the gas drainage problem of low permeability coal seam. Based on the characteristics of liquid carbon dioxide with low temperature, viscosity, percolation resistance and phase change pressurization, the liquid carbon dioxide enhanced methane recovery technology was proposed to improve the gas drainage efficiency. Liquid carbon dioxide injection test was carried out at Sangshuping No.2 mine shaft,Hancheng mining area, and by which injection process was developed, the key parameters were determined and the methane extraction efficiency influenced by carbon dioxide was examined. The results show that the pressure of injecting is fluctuated. Initially, injecting pressure rises fast and then keeps stable when rising to 2.5 MPa.The flow rate of injection maintains from 0.6 m3/h to 1.4 m3/h and the total cumulant of liquid carbon dioxide is 6.0 m3. The concentration of carbon dioxide in the test borehole is taken as index, and it's found that the influence radius of the test is 18 m. The methane concentration and the purity in the test area are 2.5 and 3.5 times of those in the original data respectively, which proves the proposed technology enhances the gas extraction efficiency.
Key words:  low permeabilitycoal seam  liquid carbon dioxide  influence radius  gas extraction  displacement and replacement
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