Unfractured grey and pink granite adjacent to a well characterized water bearing fracture known as the room 209 subvertical fracture. Pneumatic fracturing equipment the fracturing equipment consists of a high pressure air source e g compressed gas cylinders with pressure regulator and a receiver tank attached to a pipe with an in line flow meter and pressure. To investigate the impact of fluid viscosity and rock heterogeneity on the characteristics such as geometric complexity roughness and micro morphology of hydraulic fractures hfs laboratory triaxial fracturing experiments were conducted on homogeneous and layered tight sandstones using water and carbon dioxide co2 based fluids.
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