| 煤层注热CO2驱替CH4特性实验研究* |
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| 引用本文： | 姜延航,周露函,白刚,周西华,刘天祥,马英杰.煤层注热CO2驱替CH4特性实验研究*[J].中国安全生产科学技术,2022,18(10):70-77. |
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| 作者姓名： | 姜延航 周露函 白刚 周西华 刘天祥 马英杰 |
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| 作者单位： | （1.辽宁工程技术大学 安全科学与工程学院，辽宁 葫芦岛 125105；2.辽宁工程技术大学 矿山热动力灾害与防治教育部重点实验室，辽宁 葫芦岛 125105；3.华阳新材料科技集团有限公司，山西 阳泉 045000） |
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| 基金项目： | * 基金项目: 辽宁省教育厅科学研究项目(LJ2019QL002);辽宁省“兴辽英才计划”项目（XLYC2008021） |
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| 摘 要： | 为研究注CO2增产煤层气过程中注气温度对煤层渗透特性变化的影响，利用自主研发的CO2置换驱替CH4实验系统，在注气温度为40，50，60 ℃条件下进行CO2置换驱替CH4实验，定量分析置换驱替过程中出口气体流量、孔隙压力以及煤层渗透率等变化规律。研究结果表明:在实验测试的40~60 ℃范围内，提高CO2注入温度有助于产出更多的CH4及封存CO2，CO2注入温度越高，出口混合气体流量和CH4气体流量越大，呈现出先升高后降低并趋于稳定的变化趋势，实验结束时置换体积比分别为2.704，2.741和2.595，注气温度为60 ℃时驱替效果较好，每产出单位体积的CH4注入的CO2量最少；煤层孔隙压力随注气时间呈现先逐渐上升后趋于平稳的变化趋势，逐渐趋近注气压力0.8 MPa；注CO2置换驱替CH4及提高CO2注入温度会降低煤层的渗透性，注气温度恒定时，渗透率随注气时间增加呈现先逐渐降低后趋于平稳的变化规律，注气温度由40 ℃升至60 ℃时，渗透率从0.017 1×10-15 m2下降至0.009 8×10-15 m2，降低幅度为34.50%~42.69%。
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| 关 键 词： | 置换驱替CH4 温度 置换体积比 孔隙压力 渗透率 |
Experimental research on characteristics of CH4 displacement by injecting hot CO2 into coal seam |
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| JIANG Yanhang,ZHOU Luhan,BAI Gang,ZHOU Xihua,LIU Tianxiang,MA Yingjie.Experimental research on characteristics of CH4 displacement by injecting hot CO2 into coal seam[J].Journal of Safety Science and Technology,2022,18(10):70-77. |
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| Authors: | JIANG Yanhang ZHOU Luhan BAI Gang ZHOU Xihua LIU Tianxiang MA Yingjie |
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| Affiliation: | (1.College of Safety Science and Engineering,Liaoning Technical University,Huludao Liaoning 125105,China;2.Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education,Liaoning Technical University, Huludao Liaoning 125105,China;3.Huayang New Material Technology Group Co.,Ltd.,Yangquan Shanxi 045000,China) |
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| Abstract: | In order to study the influence of gas injection temperature on the permeability characteristics change of coal seam during the process of CO2 injection to increase the production of coalbed methane,the self-developed experimental system of CH4 replacement and displacement by CO2 was used to conduct the experiments of CH4 replacement and displacement by CO2 under the conditions of gas injection temperature of 40,50 and 60 ℃,and the change laws of outlet gas flow rate,pore pressure and coal seam permeability in the process of replacement and displacement were quantitatively analyzed.The results showed that increasing the CO2 injection temperature contributed to produce more CH4 and store CO2 in the experimental test range of 40~60 ℃.The higher the CO2 injection temperature,the greater the outlet mixed gas flow rate and CH4 gas flow rate,which presented the trend of increasing first and then decreasing and tending to be stable.At the end of the experiment,the replacement volume ratio was 2.704,2.741 and 2.595,respectively.The displacement effect was better when the gas injection temperature was 60 ℃,and the amount of injected CO2 per unit volume of produced CH4 was the least.The pore pressure of coal seam presented the trend of gradually increasing first and then becoming stable with the gas injection time,and gradually approached the gas injection pressure of 0.8 MPa.CH4 replacement and displacement by injection of CO2 and increasing the CO2 injection temperature would reduce the coal seam permeability,and when the gas injection temperature was constant,the permeability presented the trend of gradually decreasing first and then becoming stable with the increase of gas injection time.When the gas injection temperature increased from 40 ℃ to 60 ℃,the permeability decreased from 0.017 1×10-15 m2 to 0.009 8×10-15 m2,and the decrease amplitude was 34.50%~42.69%. |
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| Keywords: | CH4 replacement and displacement temperature replacement volume ratio pore pressure permeability |
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