A Hydro-fracturing Tester for Rock Saturated with Controlled Two-Phase Pore Fluids.

Three groups of fracturing tests in two-phase fluids of CO SB 2 sb and water were conducted, where the pressure of CO SB 2 sb was set at 3.0 MPa, 3.4 MPa, and 3.7 MPa, respectively. It can be observed that the CO SB 2 sb saturation after the displacement range from 44.15% to 68.43%, i.e., the CO SB 2 sb saturation goes up with the increase of CO SB 2 sb displacement pressure. As the confining pump was operated in a constant-pressure mode, when the CO SB 2 sb flowed into the confining pressure chamber through the sample during the fracturing, the piston was moved back by the pump for stabilizing the pressure, thus yielding negative flow rate. [Extracted from the article]