The Reservoir Adaptability and Oil Displacement Mechanism of Polymer Microspheres.

摘要: Polymer microsphere profile control is a promising approach for the of heterogeneous reservoirs. Matching between polymer microspheres and reservoir pore throat crucial control. In this study, range optimal matching factor Ra core porosity was divided through permeability limit experiments, dynamic migration laws shut-off patterns were studied using 9-m-long cores microscopic models. The oil displacement effect mechanism analyzed three in parallel. “injectability limit” “in-depth curves by into zones: blockage (Ra 5.70 ± 0.64). During porous media, gradually enlarged size thus successively shut off four forms: multi-microsphere bridging shut-off, few-microsphere single-microsphere elastic shut-off. Microspheres with rational combination sizes versus those single particle further enhanced recovery under certain conditions. Through “temporary shut-off–breakthrough–temporary shut-off,” able to change fluid flow rate streamlines, mobilize residual oils, enhance rates.