Experimental Study on Enhanced Oil Recovery by Nitrogen-Water Alternative Injection in Reservoir with Natural Fractures

Table 2

Statistical table of oil recovery and displacement pressure difference under different displacement modes.

Displacement mode	Oil recovery (%)	Displacement pressure difference (MPa)
Continuous water injection	21.22	9.34
Continuous gas injection	19.23	7.88
Alternating gas-water flooding after water flooding	24.67	9.82
Alternating gas-water flooding after gas flooding	26.11	9.32