Screening of Surfactants for Flooding at High-Mineralization Conditions: Two Production Zones of Carbonate Reservoir

Aleksei O. Malahov, Emil R. Saifullin, Mikhail A. Varfolomeev, Sergey A. Nazarychev, Aidar Z. Mustafin, Chengdong Yuan, Igor P. Novikov, Dmitrii A. Zharkov, Rustam N. Sagirov and Rail I. Kadyrov
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Aleksei O. Malahov: Department of Petroleum Engineering, Kazan Federal University, 420008 Kazan, Russia
Emil R. Saifullin: Department of Petroleum Engineering, Kazan Federal University, 420008 Kazan, Russia
Mikhail A. Varfolomeev: Department of Petroleum Engineering, Kazan Federal University, 420008 Kazan, Russia
Sergey A. Nazarychev: Department of Petroleum Engineering, Kazan Federal University, 420008 Kazan, Russia
Aidar Z. Mustafin: Department of Petroleum Engineering, Kazan Federal University, 420008 Kazan, Russia
Chengdong Yuan: Department of Petroleum Engineering, Kazan Federal University, 420008 Kazan, Russia
Igor P. Novikov: Tatnefteprom JSC, RF, 423450 Almetyevsk, Russia
Dmitrii A. Zharkov: Department of Petroleum Engineering, Kazan Federal University, 420008 Kazan, Russia
Rustam N. Sagirov: Department of Petroleum Engineering, Kazan Federal University, 420008 Kazan, Russia
Rail I. Kadyrov: Department of Petroleum Engineering, Kazan Federal University, 420008 Kazan, Russia

Energies, 2022, vol. 15, issue 2, 1-15

Abstract: The selection of effective surfactants potentially can mobilize oil up to 50% of residuals in mature carbonate oilfields. Surfactants’ screening for such oilfields usually is complicated by the high salinity of water, high lipophilicity of the rock surface, and the heterogeneous structure. A consideration of features of the oilfield properties, as well as separate production zones, can increase the deep insight of surfactants’ influence and increase the effectiveness of surfactant flooding. This article is devoted to the screening of surfactants for two production zones (Bashkirian and Vereian) of the Ivinskoe carbonate oilfield with high water salinity and heterogeneity. The standard core study of both production zones revealed no significant differences in permeability and porosity. On the other hand, an X-ray study of core samples showed differences in their structure and the presence of microporosity in the Bashkirian stage. The effectiveness of four different types of surfactants and surfactant blends were evaluated for both production zones by two different oil displacement mechanisms: spontaneous imbibition and filtration experiments. Results showed the higher effect of surfactants on wettability alteration and imbibition mechanisms for the Bashkirian cores with microporosity and a higher oil displacement factor in the flooding experiments for the Vereian homogeneous cores with lower oil viscosity.

Keywords: surfactant flooding; enhanced oil recovery (EOR); spontaneous imbibition; high salinity; carbonate reservoir (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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