RT Journal Article
T1 Design and performance analysis of a formulation based on SDBS and ionic liquid for EOR in carbonate reservoirs
A1 Somoza Cerviño, Alba
A1 Tafur Angulo, Néstor Alberto
A1 Arce Arce, Alberto
A1 Soto Campos, Ana María
K1 Anionic
K1 Cationic
K1 Synergy
K1 Microemulsion
AB A large proportion of extant crude oil is found in carbonate reservoirs worldwide. Alkylbenzene sulfonates are inexpensive anionic surfactants but they cannot be used in these reservoirs due to their incompatibility with divalent ions and high adsorption on the rocks. This paper proposes the solution to that problem by blending this kind of surfactant with surface-active ionic liquids. Namely, a formulation containing sodium dodecylbenzenesulfonate (SDBS) and cocosalkylpentaethoximethylammonium methylsulfate ([C1EG][MeSO4]) was designed for the application. Two optimal blends, at 40/60 and 73.7/26.3 SDBS/[C1EG][MeSO4] ratios, were found in synthetic seawater via equilibria and interfacial tension (IFT) studies. Core-flooding tests were carried out to check the performance of both blends. The first blend ratio (40 wt% SDBS) was selected to define an optimal formulation (1 wt% blend in synthetic seawater at 298.15 K) due to its better injectability, higher reduction of the IFT, lower adsorption, and better oil recovery. Attained tertiary oil recovery (18% of the original oil in place), with low blend adsorption (0.37 mgblend/grock), shows the promising performance of the solution. The main mechanism associated with improved oil recovery is IFT reduction. This work offers a significant advance in the application of natural petroleum sulfonates in carbonate reservoirs
PB Elsevier
YR 2022
FD 2022
LK http://hdl.handle.net/10347/27872
UL http://hdl.handle.net/10347/27872
LA eng
NO Journal of Petroleum Science and Engineering 209 (2022) 109856. https://doi.org/10.1016/j.petrol.2021.109856
NO The authors acknowledge the Ministry of Science and Innovation and State Research Agency for financial support throughout project PGC2018-097342-B-I00, including European Regional Development Fund). A. Somoza also acknowledges predoctoral financial support (grant ref. PRE2019-089101). We would also like to thank SNF Floerger for supplying polymer samples, Repsol (A Coruña) for providing the crude oil used for the experiments, and L. Membrado (Separation and Detection Group, Instituto Carboquímico de Zaragoza) for the realization of the SARA analysis of the crude oil
DS Minerva
RD 3 may 2026