The Empirical and Theoretical Miscible Characterization Method in Gas-Enhanced Oil Recovery

Table 1

Current MMP forecasting methods [5–8].

Analytical forecasting method		Advantages	Disadvantages	Data conditions
Empirical formula method		Simple, convenient, and quick, apply for prescreening and feasibility study	Forecasting method has some certain limitations	Surface crude oil density, molecular weight of heavy component, critical pressure, critical temperature, etc.
Theory calculation method	State equation method	Suit for crude oil with relative few components and relative reliable result	Large calculation deviation for multicomponent system	Composition of crude oil and injected gas, component critical parameters, reservoir temperature
	Tie-line analytical method	Relative reliable result	Rely on the characteristics of fluid components, further improvement is needed in terms of multicomponent system
	Mix cell methods	Relative reliable result	Rely on the characteristics of fluid components
	Numerical simulation method	Relative reliable result	Based on experiment, time-consuming	Fluid pvt data, phase permeability, capillary pressure, reservoir temperature, composition of crude oil, and injected gas