Abstract:Dissection plugging is an important means to improve the recovery rate of water drive in high water content oilfield, and granular plugging agent is widely used as an important chemical plugging agent. In this paper, the flow of self-developed nano-sized oil-soluble resin particles dispersions of conditioning repellents in cores and their blocking ability were tested using a core replacement device. The injection performance and plugging performance of oil-soluble resin dispersions conditioning repellents within the formation were mainly evaluated using the replacement pressure as an index. The experimental results show that the oil-soluble resin dispersions conditioning repellents have good injection performance and blocking performance. As the concentration of the oil-soluble resin increases, the injection pressure of the oil-soluble resin dispersion rises. As the formation permeability decreases, the injection pressure of the oil-soluble resin dispersion increases. And when the resin concentration is 5%, the dispersion system has good injection performance in formations with different permeability. The blocking rate of oil-soluble resin dispersion on the ground layer increases with the increase of oil-soluble resin concentration, and the blocking rate remains basically unchanged when the resin concentration exceeds 5%. The blocking rate increases as the formation permeability decreases and provides a good blocking effect at formation permeabilities of 30 mD or less. In addition, the oil-soluble resin dispersions have good scour resistance in formations of all permeabilities. Keywords: nanoparticle dispersions; alternation experiment; profile control and water plugging; enhanced oil recovery