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research-article

Optimized cyclic water injection strategy for oil recovery in low-permeability reservoirs

[+] Author and Article Information
Xiaofei Sun

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, PR China 266580
sunxiaofei540361@163.com

Yanyu Zhang

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, PR China 266580
yyzhang@upc.edu.cn

Jie Wu

Downhole Service Company, Shengli Petroleum Engineering Co., Ltd. SINOPEC, Dongying, Shandong, PR China 257000
1542962819@qq.com

Mengke Xie

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, PR China 266580
466499682@qq.com

Hang Hu

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, PR China 266580
794627181@qq.com

1Corresponding author.

ASME doi:10.1115/1.4040751 History: Received January 13, 2018; Revised June 27, 2018

Abstract

With the worldwide decline of conventional oil production, tremendous unconventional resources, such as low-permeability reservoirs, are becoming increasingly important. Cyclic water injection (CWI) as an oil recovery method has attracted increasing attention in the present environment of low oil prices. However, the optimal CWI strategy is dif?cult to determine for a mature oilfield due to the involvement of multiple wells with multiple operational parameters. Thus, our main focus in this paper is to present a novel and systematic approach to optimize CWI strategies by studying a typical low-permeability reservoir G21. To this end, a comprehensive method that combines the advantages of streamline simulation and fuzzy comprehensive evaluation was proposed to identify water channeling in the reservoir. Second, the reliability of the method was verified using tracer tests. Finally, a new hybrid optimization algorithm, the simulated annealing genetic algorithm (SAGA), coupled with a reservoir simulator was developed to determine an optimal CWI strategy for the low-permeability reservoir. The results show that the CWI technique is viable as a primary means in the present environment of low oil prices to improve waterflooding performance in low-permeability reservoirs. The oil recovery of the most efficient strategy increases by 6.81% compared to conventional waterflooding. The asymmetric CWI scheme is more efficient than the symmetric CWI scheme for the low-permeability reservoir.

Copyright (c) 2018 by ASME
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