An Experimental Study on the Effect of a Nanofluid on Oil-Water Relative Permeability

The low porosity and low permeability of tight oil reservoirs call for improvements in the current technologies for oil recovery. Traditional chemical solutions with large molecular size cannot effectively fl ow through the nano- pores of the reservoir. In this study, the feasibility of Nanofluids fl uids has been investigated using a high pressure high temperature core-holder and nuclear magnetic resonance (NMR). The results of the experiments indicate that the specified fi ed Nanofluids fl uids can enhance the tight oil recovery significantly. fi cantly. The water and oil relative permeability curve shifts to the high water saturation side after Nanofluid fl uid fl ooding, thereby demonstrating an increase in the water wettability of the core. In the Nanofluid fl uid fl ooding process the oil recovery was enhanced by 15.1%, compared to waterflooding fl ooding stage. The T2 spectra using the NMR show that after Nanofluid fl uid fl ooding, a 7.18% increment in oil recovery factor was gained in the small pores, a 4.9% increase in the middle pores, and a 0.29% increase in the large pores. These results confirm fi rm that the Nanofluids fl uids can improve the fl ow state in micro-sized pores inside the core and increase the ultimate oil recovery factor.