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

Motaz Siddig Saeed, Prashant Jadhawar*, Yingfang Zhou, Rockey Abhishek

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Low salinity water flooding (LSWF) is a popular enhanced oil recovery technique. Among factors that affect the performance of LSWF, geochemical interaction at the oil-brine interface and the associated enterokinetic properties plays a prominent role. This work presents a triple-layer surface complexation model for predicting the zeta potential of the oil-brine interface. We improve upon previous modelling studies by incorporating the effects of (1) temperature variation, (2) basic (-NH) oil surface group interactions (3) adsorption of sodium ions on outer and inner Helmholtz planes and (4) the presence of sulphate ions in brine. Model validation against published experimental data shows model accuracy between 66% and 99%. The model displays higher accuracies at lower salinities (making it particularly suited for LSWF applications), intermediate pH and higher total acid number. In addition, a correlation between (-NH) site density and total acid/base numbers is proposed. A sensitivity study performed utilising the developed model showed that higher sulphate concentration in the brine and elevated temperature makes the zeta potential at the oil-brine interface more negative. In addition, the sensitivity study indicates that a higher concentration of basic polar oil compounds is less favourable as it may result in less water-wet conditions in the reservoir.
Original languageEnglish
Article number127903
Number of pages16
JournalColloids and Surfaces. A, Physicochemical and Engineering Aspects
Volume633
Issue numberPart 2
Early online date17 Nov 2021
DOIs
Publication statusE-pub ahead of print - 17 Nov 2021

Keywords

  • Oil-brine interface
  • Zeta potential
  • Surface complexation modelling
  • Electric Triple Layer
  • Low salinity waterflooding
  • Wettability alteration

Fingerprint

Dive into the research topics of 'Triple-layer surface complexation modelling: Characterization of oil-brine interfacial zeta potential under varying conditions of temperature, pH, oil properties and potential determining ions'. Together they form a unique fingerprint.

Cite this