Table 7. Comparison of Advantages and Disadvantages of the MMP Reduction Methods.

Reducing Techniques		Advantages	Disadvantages
Miscible Solvents	Monocomponent Miscible Solvents	Efficiently promote CO2 flooding to be miscible.	High cost. MMP may increase sharply during the displacement process.
	Polycomponent Miscible Solvents	Effect of reducing IFT is better.	Large amount of injection. Economic benefit is low.
Surfactants		Less dosage. Effect of reducing MMP is remarkable. Low cost.	It is easy to cause chromatographic separation. The selection of reagents needs to evaluate the adaptability to reservoirs.