Experimental Investigation on the Effect of Pore Size on Spontaneous Imbibition Recovery in Oil-Wet Reservoirs

Spontaneous imbibition has been considered as a significant method to enhanced oil recovery (EOR) in unconventional reservoirs. The main impediment to comprehending the variation characteristics of spontaneous imbibition at different pore scales was the reservoir's opacity. To this end, a series of spontaneous imbibition experiments of visualized oil-wet microtubes with six different diameters (10 mu m similar to 60 mu m) were performed, as were the corresponding macroscopic core imbibition tests with six different permeabilities under the same conditions. The results showed that formation brine mostly advanced along the wall surface of a capillary during the imbibition process, and some were even isolated within a capillary. The imbibition recovery in the capillary with a diameter of 10 mu m was the highest (27.81%), which was more than three times that of the capillary with a diameter of 60 mu m (8.3%). There was a good power function decline relationship between capillary diameter and imbibition recovery, and 30 mu m appeared to be a critical inflection point in both capillary tube and macroscopic core imbibition tests. In addition, the majority of the detained residual oil clusters not only cut off the continuity of formation brine but also increased the imbibition flow resistance, accelerating the imbibition to balance. This research provides a new perspective for comprehending the imbibition characteristics at different pore scales.

Automated summary

Spontaneous imbibition is considered an important method for enhanced oil recovery in unconventional reservoirs. This study experimentally investigated the variation characteristics of spontaneous imbibition at different pore scales and found a relationship between capillary diameter and imbibition recovery.