Figure 5
From: Permeability regain and aqueous phase migration during hydraulic fracturing shut-ins
Pressure across the core sample during fluids injection. In 1st oil drive (step 1), pressure rise linearly at the beginning then reaches a plateau of 1.97 MPa. In fluids invasion (step 2), pressure also increases with time while having a greater slope before reaching a plateau. In 2nd oil drive (step 4), pressure curve vibrates and presents a drastic pressure peak and a pressure drop area.
