CO_2分子置换法开采页岩气实验  

Experimental study on CO_2 replacement method used in shale gas exploration

作　　者：张广东[1] 周文[2] 吉尚策 刘建仪[1] 张键[3] 杨火海[1] 

机构地区：[1]油气藏地质及开发工程国家重点实验室(西南石油大学),成都610500 [2]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059 [3]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《成都理工大学学报（自然科学版）》2015年第3期366-371,共6页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学青年基金资助项目(51204141)

摘　　要：从CO2置换页岩气吸附气开采机理入手,通过页岩等温吸附、直接降压解析、注CO2置换解析实验评价方法,探讨利用CO2分子置换页岩气吸附气提高采收率的方法。实验结果表明,富县页岩注CO2置换法开采页岩气比直接降压开采的采收率提高了7.66%,地层压力衰竭到6.559 MPa时,注CO2效果最好,最佳的CO2注入量为0.22倍的孔隙体积。注CO2分子置换法开采页岩气是可行的,不仅能提高页岩气的采收率,而且可以缩短开采周期。This paper approaches a new method to promote the recovery by using CO2 to take the place of adsorption shale gas. The method proceeds from the perspective of exploitation mechanism of CO~ molecular replacement, by means of experiment evaluation methods of shale adsorption isotherms, direct depressurization and desorption, desorption by injecting CO2 replacement. The experiment results in labs of Fuxian suggest that the recovery by injecting CO2 increases by 7.66 % and is higher than that by the way of direct depressurization and desorption. It is more suitable to inject CO2 when the reservoir pressure exhausts to 6. 559 MPa, and the proper volume of the injecting CO2 is 0.22 times its pore volume. The CO2 molecular replacement method is feasible. It can improve the shale gas recovery and shorten the exploration cycle.

关 键 词：页岩气 置换法 二氧化碳 开采 实验 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程] TE375