[1B11-1B15] Natural resource exploitation (2)

[1B11] Evaluation of roughness due to calcite dissolution in crude oil/brine/rock system: Implications for low salinity water flooding

○Yueqi Wang¹, Xingjuan Hao¹, Yogarajah Elakneswaran¹, Takeshi Hasegawa¹ (1. Hokkaido University)

Keywords:Contact angle, Low salinity water flooding, Roughness

Low salinity water flooding (LSWF) has been considered as a promising technique for enhanced oil recovery (EOR) in carbonate reservoirs. Changes in surface roughness and oil-brine-rock interactions play an important role in the contact angle and wettability alteration in LSWF. In this study, atomic force microscopy (AFM) was used to measure the surface roughness of calcite in high and low salinity water. Moreover, the contact angle of the calcite in the brines was measured. The impact of brine salinity on calcite dissolution was evaluated by surface roughness. Finally, the influence of surface roughness on contact angle was assessed.