可视化通道内的CO2乳液驱替实验研究  

Study on CO2 emulsion displacement experiment in visualized channels

作　　者：姚林杰 胡冬冬[1] 包磊 赵玲[1] 刘涛[1] Yao Linjie;Hu Dongdong;Bao Lei;Zhao Ling;Liu Tao(State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学化学工程重点实验室

出　　处：《石油化工》2019年第9期949-956,共8页Petrochemical Technology

基　　金：国家自然科学基金项目（21676081）

摘　　要：分别采用十二烷基硫酸钠和自制表面活性剂聚乙酸乙烯酯-b-聚乙烯吡咯烷酮(PVAc15-b-PVP18)构建CO2/水乳液(C/W乳液),研究了两种表面活性剂构建和稳定C/W乳液的能力,并在可视化驱替装置中进行模拟油的驱替实验,从模拟油采收率和波及效率两方面研究了乳液的驱替性能。实验结果表明,在10 MPa时,PVAc15-b-PVP18构建的C/W乳液能稳定24 h以上,具有较高的表观黏度,模拟油采收率最高可达80%左右。随着CO2体积分数增加,C/W乳液的表观黏度上升,但乳液稳定性有所下降。水驱与CO2驱易出现指进现象,导致波及效率低下,而C/W乳液驱替稳定,在通过支路时,出现明显的绕流现象,使得波及效率显著增大。The ability to construct and stabilize CO2/water emulsion(C/W emulsion)of two kinds of surfactants were studied by using sodium lauryl sulfate and self-made surfactant polyvinyl acetate-b-polyvinylpyrrolidone(PVAc15-b-PVP18),and the displacement performance of the emulsion was studied from the aspects of simulated oil recovery and sweep efficiency by the simulated oil displacement experiment in a visual displacement device.Experimental results showed that the C/W emulsions constructed by PVAc15-b-PVP18 could remain stable for more than 24 h at 10 MPa,and has a high apparent viscosity.The simulated oil recovery can reach up to 80%.As the CO2 volume fraction increases,the apparent viscosity of the C/W emulsion increases,but the emulsion stability decreases.Easy fingering in water flooding and CO2 flooding results in low sweep efficiency,while C/W emulsion flooding is stable when passing through the branch,and obviously flowing around makes the sweep efficiency significantly increase.

关 键 词：二氧化碳/水乳液 强化驱油 可视化驱替 

分 类 号：TE357[石油与天然气工程—油气田开发工程]