Review on Phase Behavior in Tight Porous Media and Microscopic Flow Mechanism of CO₂ Huff-n-Puff in Tight Oil Reservoirs

Table 1

Summary of the study on phase behavior in tight porous media.

Objects	Reference	Results
Wall effect	Sandoval et al. [43]	It is necessary to consider the wall effect while simulating PVT experiment of shale oil.
	Lemus et al. [43]
Bubble point	Jiang [28]	The pressure reduction of bubble point pressure in porous media increases as the core permeability decreases.
	Lemus et al. [43]	The bubble point pressure decreases because of the capillary pressure.
	Nojabaei et al. [44]	The bubble point pressure decreases especially at the lower temperature.
	Yang and Li [45]	The phase envelope tends to shrink. The bubble point pressure of middle Bakken oil decreases by 17.32% when the constraint effect is taken into account.
	Pang et al. [47]	The bubble point decreases due to the capillary pressure.
	Wu et al. [48]	The bubble point pressure decreases with the increase of pore size.
Dew point	Pang et al. [47]	The dew point increases due to the capillary pressure.
	Nojabaei et al. [44]	There is either a decrease or increase for dew point pressure considering the effect of small pores.
Bubble point temperature	Sheng et al. [46]	The bubble point temperature increases as the pore diameter becomes smaller.
Minimum miscibility pressure	Wu et al. [48]	The MMP decreases with the increase of pore size.
	Zhu [49]
	Yu et al. [50]	The impurity gas increases the miscibility pressure.
Critical temperature	Jiang [28]	The critical temperature has a linear negative correlation with the pore size.