Page 46 - Enhanced Oil Recovery in Shale and Tight Reservoirs
P. 46
34 Enhanced Oil Recovery in Shale and Tight Reservoirs
Figure 2.23 Effect of injection gases on huff-n-puff oil recovery. (A) RF results for Core 1
(B) RF results for Core 2.
In Shayegi et al.’s (1996) sandstone cores and Alharthy et al.’s (2015)
shale core experiments, C 1 wasbetterthanN 2 . Li et al. (2017a) attributed
this inconsistency to the difference in oil components. Their field scale
model shows in Fig. 2.26 that the performance of N 2 is better for a dead
oil, but C 1 was better for a live oil. For a live oil, C 1 can easily dissolve
in the oil, making oil viscosity lower, compared with N 2 .But for a dead
oil, their solubility and the oil viscosity reduction are not much different.
