Research on the Oil Displacement Effect of Binary Composite System on High Water Content Heavy Oil Reservoirs

Shijie Zhu; Dong He; Xueli Duan; Yi Ren; Zhezhi Liu; Tingting Cheng; Taotao Luo

doi:10.61187/ita.v3i2.236

Authors

Shijie Zhu
zhusj@cqust.edu.cn
School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China
Dong He Chongqing 136 Geological Team, Chongqing 401331, China
Xueli Duan Binzhou Inspection and Testing Center, Shandong 256600, China
Yi Ren Research Institute of Exploration and Development, PetroChina Huabei Oil field Company, Renqiu 062552, China
Zhezhi Liu School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Tingting Cheng School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Taotao Luo School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China

Keywords:

Heavy oil reservoir, Polymer flooding, Binary composite drive, Oil displacement efficiency

Abstract

The development of water injection in heavy oil reservoirs often progresses to a late stage characterized by high water content. During this phase, more than 70% of the remaining oil is retained within the reservoir, making its recovery challenging. Consequently, there is an urgent need to identify suitable displacement systems to enhance recovery efficiency. This study examines a specific heavy oil field located offshore China, focusing on the effects of mobility control and low interfacial tension on the oil displacement efficacy during chemical flooding. The findings reveal that the oil displacement performance of a binary composite system surpasses that of a single system. The synergistic effects of the composite system are advantageous for extracting residual oil from low-permeability layers. Notably, the contribution of mobility control within the composite system (54.88%) is greater than that of low interfacial tension (45.12%). Only effective mobility control through the use of polymers can enhance the efficacy of surfactants. Furthermore, variations in the solution properties of composite systems can significantly influence the oil displacement outcomes. The binary composite system, which primarily employs mobility control and appropriately reduces interfacial tension, is more effective for enhancing the recovery rate of water-flooded high-permeability heavy oil reservoirs in the later stages.

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