Fig. 1

p-T phase of CO2（shaded part indicates that CO2 is in supercritical state）"

Fig. 2

Opalescent characteristics in supercritical CO2 pressure drop process"

Fig. 3

p-X phase of CO2-crude oil system in multiphase state"

Fig. 4

Comparison of different gas injection multiple contact miscibility triangular phase"

Fig. 5

Comparison of dissolved gas volume when different gases are injected into the same formation to reach saturation."

Fig. 6

Comparison of expansion factors when different gases are injected into the same formation to reach saturation."

Fig. 7

Comparison of crude oil viscosity when different gases are injected into the same formation to reach saturation."

Fig. 8

Effect of injection gas release extraction on formation oil volume shrinkage during depressurization of saturated formation oil"

Fig. 9

Foam oil flow at production end of long slim tube in CO2 flooding heavy oil process"

Fig. 10

Ternary phase analysis of displacement mechanism of CO2 multiple contact condensate gas flooding and multiple contact evaporation gas flooding coexist"

Fig. 11

Design of typical injection-production well group in test area（EnCana Company）"

Fig. 12

Production dynamic response of typical wells in test area after taking effect"

Fig. 13

Comparison of 4D earthquake and numerical simulation results"

Fig. 14

Production data of Weyburn oilfield at different development stages（EnCana Company）"

Fig. 15

Relation between crude oil saturation pressure and CO2 injection mole fraction in Caoshe Et formation（119 ℃）"

Fig. 16

Relation between crude oil viscosity and CO2 injection mole fraction in Caoshe Et formation （119 ℃）"

Fig. 17

Change curve of cumulative recovery of continuous CO2 flooding after 0.14 HCPV water flooding in long core"

Fig. 18

Distribution map of injection-production well pattern"

Fig. 19

Pressure monitoring distribution after gas injection"

Fig. 20

CO2 mole content distribution of reservoir"

Fig. 21

Oil increasing effect of CO2 flooding in Et formation of Caoshe oilfield"

Table 1

Part of CO2 flooding/huff and puff field test projects implemented in China"