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

Table 3

Summary of microscopic flow mechanisms by molecular simulation.

Objects	Reference	Results
Flow velocity	Guo [63]	In quartz pores and dolomite pores, the flow velocity profile of alkane is parabolic, and the flow velocity of alkane increases with the increase of driving force or pore width.
	Duan et al. [65]	The velocity profile is plunger-like, and the velocity of gas molecules at the wall is consistent with that of free gas molecules.
Slip	Guo [63]	The slip length of n-pentane flowing in quartz pores increases with the increase of driving force, and decreases firstly and then tends to be stable as the pore width increases.
	Duan et al. [65]	The slippage phenomenon disappears gradually as the pressure increases.
Flow rate	Guo [63]	The flow rate of n-pentane in pores shows a nonlinear trend with the change of pressure gradient.
Desorption	Zhu et al. [66]	CO2 could replace C10 and C17 from the surface of calcite.
	Ali et al. [67]	Dodecane could be replaced by CO2 from the pore wall.
Extraction	Fang et al. [68]	An appropriate depressurization rate can keep extraction at a high status.