A calibrated surface complexation model for carbonate-oil-brine interactions coupled with reservoir simulation - Application to controlled salinity water flooding

Vast majority of past studies that have been conducted on controlled salinity water flooding (CSWF) use diffuse layer model (DLM) calculates only the surface potential, which can be significantly different from ?-potential interface. Importantly, stability water-film (between oil and rock surface) dictates ultimate recovery is related to ?-potential. As such, using DLM calculated potential (directly) for CSWF misleading. Additionally, most existing DLMs integer charges instead fractional carbonate-brine interactions, may not represent actual carbonate crystallographic. We present a triple complexation (TLM) offers option locate distribute charge adsorbing ion(s) at three locations. TLM therefore calculate potentials locations within Stern layer. To best our knowledge, few authors used simulate CSWF. However, some reactions were ignored in these models. For instance, adsorption monovalent ions such as Na + Cl ? was available TLMs. Also, effect basic-oil components considered TLMs, lastly, TLMs group. This study introduced comprehensive includes all complexities. Moreover, we new wettability indicator (WI) electrostatic forces between oil-brine rock-brine interfaces. That is, WI ?-potentials The TLM, built geochemical simulator, PHREEQC, then coupled with UTCHEM, multiphase reservoir simulator. developed simulator based TLM-CSWF tested against several experimentally measured data sets. Results suggest Oil basic component impacts interface irrespective temperature, brine composition, ionic strength. On otherhand, influence ?-potential, this relates results further injection (sulfate-free) diluted chalk resulted increased adhesion, shifting oil-wet condition. Hence, no additional recovered injected tertiary stage. Finally, showed interfaces, would strongly or water-wet large magnitude • A triple-layer characterize carbonate-brine-oil interactions. zeta suggests SO 4 ?2 ion tends decrease CO 3 vice-versa. small fraction carbonate-oil-brine reactive sites are involved reactions.