Study on Micro Displacement Mechanism of Hydraulic Fracturing by Oil Displacement Agent at High Pressure

Figure 12

Average wetting index of core 17-1 and core 21-2 under four states (state 1 denotes the original state; state 2 denotes the state of water driving under conventional injection rate; state 3 denotes the state of fracturing by water at high pressure; state 4 denotes the state of fracturing by an oil displacement agent at high pressure).