Abstract
In this paper, in order to study the effect of emulsification on the oil displacement of the system, several polymer, surfactant/polymer (S/P) and alkali/surfactant/polymer (A/S/P) systems were prepared for experiments. Firstly, the interfacial tension of each system was investigated. After the emulsion was prepared, the droplet size was observed by microscope and the intensity of the backscattered light during the destabilisation process of the emulsion was tested with the stability analyser. The TSI value was calculated to evaluate the stability of the emulsion. Finally, the Berea core displacement experiment (chemicals are used to displace oil from the core) was carried out to test the ability to enhance the oil recovery. The experimental results show that the emulsion formed by the A/S/P system with the simulation oil has the best stability. The chemical displacement recovery is the highest, which is 32.15 %. The emulsion stability of the S/P system is second, and the chemical displacement recoveries are 17.03 % and 20.76 %, respectively. The polymer system has no interfacial activity, does not form an emulsion, and has the lowest chemical displacement recovery of 8.02 %. This shows that the deeper the degree of emulsification of the system and the more stable the emulsion, the better the oil displacement effect of the oil displacement system.
About the authors
Biao Wang is currently engaged in high-level technology and the management of oilfield production.
Yu Su has received his bachelor’s degree in petroleum engineering and his master’s degree in oil and gas field development engineering. He is now engaged in oilfield production technology.
Leilei Zhang has a master’s degree in oil and gas field development engineering and a doctorate degree in petroleum and natural gas engineering. He now works in higher education in petroleum engineering.
Jingwei Yang is now engaged in high-level technical work in oilfield production.
Gen Li has earned a Ph.D. in oil and gas engineering. Currently engaged in higher education in petroleum engineering.
Keliang Wang has earned a Ph.D. in oil and gas engineering. Currently engaged in higher education in petroleum engineering.
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Research ethics: The local Institutional Review Board deemed the study exempt from review.
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Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Competing interests: The authors state no conflict of interest.
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Research funding: The National Natural Science Foundation of China (No. 51974088).
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Data availability: The raw data can be obtained on request from the corresponding author.
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