M. Ahmadi, SPE, A. Habibi, SPE, and P. Pourafshary, SPE, Institute of Petroleum Engineering, University of Tehran; and S. Ayatollahi, SPE, EOR Research Center, School of Chemical and Petroleum Engineering, Shiraz University (now with Sharif University of Technology) Summary Fines migration is a noticeable problem in petroleum-production engineering. Plugging of throats in porous media occurs because of detachment of fine particles from sand surfaces. Thus, the study of interactions between fines and pore surfaces and the investigation of governing forces are important factors to consider when describing the mechanism of the fines-release process. The main types of these forces are electric double-layer repulsion (DLR) and London-van der Waals attraction (LVA). It may be possible to alter these forces with nanoparticles (NPs) as surface coatings. In this paper, we present new experiments and simple modeling to observe such properties of NPs. A zeta-potential test was used to examine changes in the potential of the pore surfaces. Total interaction energy was then mathematically calculated to compare different states. Total interaction energy is a fitting criterion that gives proper information about the effect of different NPs on surface properties.