Predicting the potential deposition of colloids in porous media through extended DLVO theory

In this research, we explore the potential colloids’ deposition on the rock surface in subsurface colloidal systems. This was performed by evaluating the chemical interactions between colloids (calcite and oil) and rock surface through a DLVO-based model. As a subsurface colloidal flow system, we consider produced water reinjection in a carbonate reservoir to apply our model. We combine surface complexation models and extended DLVO theory to develop a calibrated model that facilitates the assessment of colloids’ attachment to or detachment from the reservoir rock across a range of physiochemical conditions. Surface complexation models facilitate the determination of how factors such as reservoir rock lithology, solution chemistry, temperature, and pH contribute to electrostatic forces between colloids and porous media surfaces, influencing the potential attachment/detachment of colloids. These insights are helpful for strategic planning in subsurface water flooding scenarios, evaluating risks associated with colloid-surface-aqueous interactions, and employing effective approaches to mitigate potential formation damage.