CO_(2)注气压力对CH4驱替特性影响实验研究  

Experimental study on influence of CO_(2) injection pressure on CH 4 displacement characteristics

作　　者：韩光[1,3] 付志豪 白刚[1,2,3] 周西华 韩明旭[1,3] 王学鹏 杨洪涛 HAN Guang;FU Zhihao;BAI Gang;ZHOU Xihua;HAN Mingxu;WANG Xuepeng;YANG Hongtao(College of Safety Science and Engineering,Liaoning Technical University,Huludao Liaoning 125105,China;Huayang New Material Technology Group Co.,Ltd.,Yangquan Shanxi 045000,China;Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education,Liaoning Technical University,Huludao Liaoning 125105,China)

机构地区：[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]华阳新材料科技集团有限公司,山西阳泉045000 [3]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

出　　处：《中国安全生产科学技术》2022年第8期85-90,共6页Journal of Safety Science and Technology

基　　金：辽宁省教育厅青年项目(LJ2019QL002);辽宁工程技术大学学科创新团队项目(LNTU20TD-29);辽宁省‘兴辽英才计划’项目(XLYC2008021)。

摘　　要：为研究CO_(2)驱替CH_(4)过程中注气压力对气体解吸特性的影响,采用自主搭建的驱替实验平台,在0.6,0.8,1.0 MPa不同注气压力下进行驱替实验,研究CO_(2)驱替CH_(4)过程中煤层温度、气体浓度、置换效率和渗透率等变化规律。实验结果表明:提高CO_(2)注气压力可提高CO_(2)置换驱替煤层CH_(4)的效果。随着注气压力增大,CH_(4)累计解吸量增大,CO_(2)突破时间越短,CO_(2)封存量越大,置换效率升高,驱替比下降。注气压力为0.6,0.8,1.0 MPa时,CH_(4)累计解吸量分别为90.2,94.1,97.8 L;CO_(2)封存量分别为19.73,19.92,20.21 mL/g;置换效率由76.9%上升到80.2%再到82.9%,驱替比由3.28下降到3.17再到3.09。注气驱替CH_(4)过程中煤层温度升高,可分为低速升温、高速升温和趋于平缓阶段。煤层温度最高变化量分别为9.4,11.5,12.7℃。同一注气压力下,煤层渗透率变化可分为缓慢增长、急剧下降和趋于稳定阶段。In order to study the influence of gas injection pressure on the gas desorption characteristics during the process of CO_(2) displacement for CH_(4),the displacement experiments were carried out under different gas injection pressures of 0.6 MPa,0.8 MPa and 1.0 MPa by using the self-built displacement test platform,and the variation laws of coal seam temperature,gas concentration,displacement efficiency and permeability during the process of CO_(2) displacement for CH_(4).The experimental results showed that increasing the CO_(2) injection pressure could improve the effect of CO_(2) displacement for CH_(4) in the coal seam.With the increase of gas injection pressure,the cumulative desorption amount of CH_(4) increased,the shorter the CO_(2) breakthrough time,the larger the CO_(2) storage amount,the displacement efficiency increased,and the displacement ratio decreased.When the gas injection pressure was 0.6,0.8,1.0 MPa,the cumulative desorption amount of CH_(4) was 90.2,94.1,97.8 L,respectively,and the CO_(2) storage amount was 19.73,19.92,20.21 mL/g,respectively.The displacement efficiency increased from 76.9%to 80.2%and then to 82.9%,and the displacement ratio decreased from 3.28 to 3.17 and then to 3.09.The temperature of coal seam in the process of gas injection displacement for CH_(4) increased,which could be divided into the low speed temperature rise stage,high speed temperature rise stage and tending to be gentle stage.The maximum variation of coal seam temperature was 9.4,11.5,12.7℃,respectively.Under the same gas injection pressure,the change of coal seam permeability could be divided into the slow growth stage,sharp decline stage and tending to be stable stage.

关 键 词：不同注气压力 气体解吸特性 突破时间 置换效率 驱替比 渗透率 

分 类 号：X936[环境科学与工程—安全科学]