Profile improvement during CO_2 flooding in ultra-low permeability reservoirs

查看全文 作　　者：Zhao [1,2,3]Fenglan;Zhang [1,2,3]Lei;Hou [1,2,3]Jirui;Cao [1,2,3]Shujun

机构地区：[1]Research Institute of Enhanced Oil Recovery, China University of Petroleum;[2]Key Laboratory of Enhanced Oil Recovery,CNPC;[3]Key Laboratory of Petroleum Engineering,Ministry of Education

出　　处：《Petroleum Science》索引2014年第11卷第2期,共8页

基　　金：Financial support for this work from National Sciencetechnology Support Plan Projects (No. 2012BAC26B00);the Science Foundation of China University of Petroleum, Beijing (No.2462012KYJJ23) 摘　　要：Gas flooding such as CO2 flooding may be effectively applied to ultra-low permeability reservoirs, but gas channeling is inevitable due to low viscosity and high mobility of gas and formation heterogeneity. In order to mitigate or prevent gas channeling, ethylenediamine is chosen for permeability profile control. The reaction mechanism of ethylenediamine with CO2, injection performance, swept volume, and enhanced oil recovery were systematically evaluated. The reaction product of ethylenediamine and CO2 was a white solid or a light yellow viscous liquid, which would mitigate or prevent gas channeling. Also, ethylenediamine could be easily injected into ultra-low permeability cores at high temperature with protective ethanol slugs. The core was swept by injection of 0.3 PV ethylenediamine. Oil displacement tests performed on heterogeneous models with closed fractures, oil recovery was significantly enhanced with injection of ethylenediamine. Experimental results showed that using ethylenediamine to plug high permeability layers would provide a new research idea for the gas injection in fractured, heterogeneous and ultra-low permeability reservoirs. This technology has the potential to be widely applied in oilfields. 关键词：低渗透油藏 CO2驱个人资料地层非均质性二氧化碳乙二胺高流动性反应机理

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Profile improvement during CO_2 flooding in ultra-low permeability reservoirs

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