Effect of Gas-Wetness of Cores on Imbibition

Gas-wetness of cores plays an important role on imbibition. Gas-wetness of cores, treated by various concentration fluorocarbon polymer Zonyl8740 (aq), was measured by the captive bubble. Subsequently, co-current and counter-current spontaneous imbibition were conducted on the various gas-wet cores both in air/wate and air/oil systems. Experimental results showed that, with the increase of concentration of Zonyl8740 solutions, gas-wetting ability against liquid on the cores gets stronger, gas recovery decreases, and the trapped gas saturation increases. Meanwhile, on the cores treated by the same concentration Zonyl8740 solution, air/water systems have a stronger gas-wettability than that of air/oil systems.