Experimental Investigation of the EOR Performances of Carbonated Water Injection in Tight Sandstone Oil Reservoirs

2018 International Conference on Air Pollution and Environmental Engineering

生态环境科学

Qu, Xuefeng^1 ; Lei, Qihong^1 ; He, Youan^1 ; Chen, Zhewei^2 ; Yu, Haiyang^2

Research Institute of Exploration and Development, Petro China Changqing Oilfield Company, Xi'an, China^1

State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China^2

关键词: Carbonated waters;    Changqing oilfield;    Experimental investigations;    Injected fluids;    Reservoir conditions;    Tight formation;    Tight sandstones;    Water alternating gas;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/208/1/012054/pdf
DOI  :  10.1088/1755-1315/208/1/012054

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Carbonated water injection (CWI) refers to a method that using carbonated water (CO2 dissolved in water under high pressure) as injected fluid to displace oil in the reservoir. At present there is no report about CWI study in tight oil reservoirs. Based on the reservoir condition and material of a tight formation in Changqing Oilfield, we investigate the core displacement performances of CWI, water alternating Gas (CO2), surfactant injection, and active carbonated water (adding surfactant in carbonated water) injection. Experimental results demonstrate that CWI recovery is 7.2% more than water injection, and 2.7% more than WAG injection; ACWI achieves the best performance with 10% more oil recovery than water injection.