Methods pressure pulses rock vibration levels measured by peak particle velocities and borehole hydraulic pressures were monitored to assess the physical impact of the blasts on the surrounding rock. To investigate how the viscosity of the fracturing fluid affects fracture propagation hydraulic fracturing experiments using three fluids with different viscosities supercritical co2 water and viscous oil under the true tri axial condition were conducted on anisotropic granite specimens and then the induced fractures were microscopically observed via a fluorescent method. Practically this means that fracturing fluid can be chosen to enable the initiation and growth of hydraulic fractures under conditions where the required wellbore pressure for instantaneous initiation cannot be reached.
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