In this paper,we supplement capillary desaturation data in the literature with additional wetting systems.The study is performed on Berea sandstone rock samples prepared with different wetting conditions.The rock wettability was characterized with spontaneous imbibition.Residual oil saturations as a function of capillary and Bond number are measured using flooding and centrifuge techniques,respectively,for a wide range of capillary and Bond numbers.We find a strong interrelation between wettability,residual oil saturation,and critical capillary and Bond numbers.As the system becomes less water-wet the residual oil saturation decreases and the critical capillary and Bond numbers increase.We find that the critical capillary or Bond number for strongly waterwet rock is 10~(-5) ,which is in agreement with data reported in literature.However,for less water-wet rock,the critical capillary or Bond number is higher by at least one order of magnitude.The data presented in this paper indicate that reservoir wettability may significantly impact the design of enhanced oil recovery processes.
展开▼
