COMSOL-based investigation of the characteristics of microscopic water flooding and residual oil distribution in carbonate reservoirs

Carbonate reservoirs are rich in oil and gas reserves; thus, they have great exploitation potential. Therefore research on the microscopic mechanisms of carbonate is significance. Based thin section images core castings typical Well 555 its pore fracture features actual reservoirs, this study designed three kinds representing throat structure real rocks by applying image stitching binarization processing methods. A model was then established using COMSOL numerical simulation software. The water flooding characteristics residual distributions different schemes were observed designing development forms. fractures that developed parallel main lines showed a more obvious influence compared to vertical lines. cluster type early stage pure matrix model. With progress flooding, continuous gradually turned into mainly discontinuous porous columnar oils. Vertical mainline reduced amount clusters replaced it with oil. In contrast, line expanded unswept area, appearing contiguous clusters. This microscopically analyzed law provide key theoretical support for enhancing recovery.