Brine Divalent Ions Impacts on Wettability Alteration of Carbonate Rock Sample at Presence of DTAB

Abstract:

Among many Enhanced Oil Recovery (EOR) methods, chemical flooding for wettability alteration of carbonate oil-wet rock is one of the most noticeable methods amid researchers. However, several crucial aspects concerning wettability alteration are still unknown and unanswered to date. Understanding the ionic composition of brine is a very important subject to which numerous studies are being dedicated, with the objective of determining the role of brine and its composition on wettability alteration, particularly its effects on EOR. The objectives of this research work is the investigation of the effects of different brine ions (Ca²⁺, Mg²⁺ and SO₄^2-) on wettability alteration of oil-wet carbonate rocks while using cationic surfactant flooding Dodecyl Trimethyl Ammonium Bromide (DTAB). Results showed that the presence of SO₄^2- is crucial and can improve DTAB efficiency. Contact angle maximum change is 62^o to 19^o with concentration of Na₂SO₄ equal to 6 g/l.

• Periodical: Defect and Diffusion Forum (Volume 380)
• Pages: 191-197
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.380.191
• Online since: November 2017
• Authors: S.N. Hosseini, Maziyar Sabet*, Hassan Soleimani, H. Ahmadi Eshkaftaki
• Keywords: Brine, Carbonated Rock, Contact Angle, DTAB, Limestone, Wettability Alteration

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