Triple-layer surface complexation modelling: Characterization of oil-brine interfacial zeta potential under varying conditions of temperature, pH, oil properties and potential determining ions

Ionic Interactions at the Crude Oil–Brine–Rock Interfaces Using Different Surface Complexation Models and DLVO Theory: Application to Carbonate Wettability

“…Ca 2+ and Mg 2+ ions, which are known to strongly interact at the COBR interface, were assumed at the inner layer, with a net charge transfer to the outer layer (1-plane or Δ Z 1 ). The values used for the Δ Z i in Table were sourced from the work by Hao et al, which were based on the understanding of the calcite–brine lattice. ,,− The calcite–brine interface was equilibrated with calcite mineral and atmospheric CO 2 , i.e., partial pressure of 10 –3.4 atm. However, the oil–brine interface was only equilibrated with atmospheric CO 2 .…”

Low salinity water and polymer flooding in sandstone reservoirs: Upscaling from nano-to macro-scale using the maximum energy barrier

“…However, recently triple-layer surface complexation models (TLMs) have been utilised to describe the COBR interactions while accounting for the adsorption of PDIs on three electrostatic planes (Takeya et al, 2019a(Takeya et al, , 2019bBonto et al, 2020;Liu and Wang, 2021;Tetteh et al, 2022aTetteh et al, , 2022bTaheriotaghsara et al, 2021). Our previously developed oil-brine (Saeed et al, 2022b) and sandstone rock-brine (Saeed et al, 2022a) TLMs succeeded in simulating the interactions at both oil-brine and sandstone rock-brine interfaces and were validated against various published experimental datasets. The oil-brine model considered both acidic, -COOH, and basic, -NH, polar surface groups on oil surface.…”

“…The sandstone-brine model also included the crucial individual and collective effects of various sandstone minerals on the overall rock zeta potential. Our previously developed oil-brine and sandstone-brine models (Saeed et al, 2022a(Saeed et al, , 2022b are employed in this work to quantify the effects of various parameters on the performances of LSWF and LSP on both nano-and macro-scale levels.…”

“…The oil-brine and sandstone-brine triple-layer surface complexation models (see Fig. 1) used in this work are adopted from our previously reported studies (Saeed et al, 2022a(Saeed et al, , 2022b. The surface complexation modelling is carried out using the state-of-art geochemical code PHREEQC.…”

“…These reactions include the adsorption of various potential determining ions such as H + , Na + , Ca 2+ and Mg 2+ to oil surface groups, -COOH and -NH, and sandstone rock surface groups, > Al:SiOH. Further details on the adopted TLMs can be found in Saeed et al, 2022aSaeed et al, , 2022b.…”