煤层气井组生产后期注CO_2提高采收率研究  

CO_2 Injection to Enhance CBM Recovery Efficiency of CBM Well Group in the Later Stage

作　　者：马飞英[1,2] 王林[1,2] 刘全稳[1,2] 鲍祥生[1,2] 王慧 谢寿昌[4] 

机构地区：[1]广东石油化工学院石油工程学院,广东茂名525000 [2]广东省非常规能源工程技术研究中心,广东茂名525000 [3]中国石油东方地球物理勘探有限责任公司,河北涿州072751 [4]中国石油新疆油田公司开发公司,新疆克拉玛依834000

出　　处：《广东石油化工学院学报》2016年第6期9-11,27,共4页Journal of Guangdong University of Petrochemical Technology

基　　金：广东石油化工学院人才引进科研启动项目(650128;650132)

摘　　要：在煤层气井生产后期,随着地层能量的衰竭,井底压力下降,套压逐渐接近集气管网压力,使得井口煤层气不能进入管网。为提高煤层气采收率,对注CO_2提高煤层气采收率的机理和CO_2注入时机进行了分析,并采用数值模拟方法模拟了煤层气五点井网生产后期将中间的生产井改为CO_2注入井后的生产动态。模拟结果显示,注入CO_2936.83×10~4 m^3后,能够增产CH4414.50×10~4 m^3,可以提高采收率14.24%,实现煤层中埋存CO_2920.51×10~4 m^3。Bottom hole pressure drops as the stratum energy depletes in the late production,and the casing pressure asymptotically approaches gas collecting pipe pressure,which enables the gas not to flow into the pipe.In order to enhance CBM recovery of the later stage,CO2 injection method in the coal bed is studied.Firstly,mechanisms of enhancing CBM recovery by CO2 injection are studied,then injection timing of CO2 injection is analyzed.Finally,after CO2 is injected into the central well of five spot wells network,the production performance is simulated by numerical simulation method.The simulation result shows that injection of 936.83×10^4 m^3 CO2 enables the production to increase by 414.50×10^4 m^3 CH4,a 14.24% recovery increase,realizing the storage of 920.51×10^4 m^3 CO2.

关 键 词：煤层气 生产后期 低压低产 采收率 

分 类 号：TE377[石油与天然气工程—油气田开发工程]