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Open AccessArticle

Optimization Design of Injection Strategy for Surfactant-Polymer Flooding Process in Heterogeneous Reservoir under Low Oil Prices

1
College of Petroleum Engineering, Yangtze University, Wuhan 430100, China
2
Research Institute of Exploration and Development of Shengli Oilfield, SINOPEC, Dongying 257000, China
3
Engineering Technology Research Institute of Xinjiang Oilfield Company, CNPC, Karamay 834000, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(19), 3789; https://doi.org/10.3390/en12193789
Received: 28 July 2019 / Revised: 5 September 2019 / Accepted: 4 October 2019 / Published: 7 October 2019
(This article belongs to the Special Issue Enhanced Oil Recovery 2020)
Surfactant–polymer (SP) flooding has significant potential to enhance oil recovery after water flooding in mature reservoirs. However, the economic benefit of the SP flooding process is unsatisfactory under low oil prices. Thus, it is necessary to reduce the chemical costs and improve SP flooding efficiency to make SP flooding more profitable. Our goal was to maximize the incremental oil recovery of the SP flooding process after water flooding by using the equal chemical consumption cost to ensure the economic viability of the SP flooding process. Thus, a systematic study was carried out to investigate the SP flooding process under different injection strategies by conducting parallel sand pack flooding experiments to optimize the SP flooding design. Then, the comparison of the remaining oil distribution after water flooding and SP flooding under different injection strategies was studied. The results demonstrate that the EOR efficiency of the SP flooding process under the alternating injection of polymer and surfactant–polymer (PASP) is higher than that of conventional simultaneous injection of surfactant and polymer. Moreover, as the alternating cycle increases, the incremental oil recovery increases. Based on the analysis of fractional flow, incremental oil recovery, and remaining oil distribution when compared with the conventional simultaneous injection of surfactant and polymer, the alternating injection of polymer and surfactant–polymer (PASP) showed better sweep efficiency improvement and recovered more remaining oil trapped in the low permeability zone. Thus, these findings could provide insights into designing the SP flooding process under low oil prices. View Full-Text
Keywords: surfactant-polymer flooding; enhanced oil recovery; injection strategy; remaining oil distribution; heterogeneous reservoir surfactant-polymer flooding; enhanced oil recovery; injection strategy; remaining oil distribution; heterogeneous reservoir
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MDPI and ACS Style

He, H.; Chen, Y.; Yu, Q.; Wen, X.; Liu, H. Optimization Design of Injection Strategy for Surfactant-Polymer Flooding Process in Heterogeneous Reservoir under Low Oil Prices. Energies 2019, 12, 3789.

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