Experimental Study of the Sealing Capacity of Anion and Cationic Microcoil

Alternative injection of anion microcoil and cationic microcoil has a nice sealing capacity in the low permeability reservoir. Laboratory experiments on the core displacement are conducted to evaluate the sealing capacity of microcoil, which have studied the sealing capacity of anion microcoil, cationic microcoil, alternative injection of anion microcoil and cationic microcoil, alternative injection of cationic microcoil and anion microcoil. The results indicate that injection mode have a significant impact on the sealing capacity. And alternative injection of cationic microcoil and anion microcoil can develop efficient sealing capacity in the hypertonic condition. This technology can enhance the flow resistance of high permeability layer, and have good plugging and washing resistance properties. The plugging rate reaches 87.72% after two alternative injections of microcoil. The result shows that it can enhance oil recovery efficiency by 28% after alternativing injection of microcoil.