A laboratory testing program was performed to investigate the behavior of the sandstone of an HPHT reservoir when subjected to realistic in-situ stresses, pore pressures and stress changes due to production. Volumetric changes, stress path effects, plastic deformation and strength were included. It was found that the Terzaghi effective stress definition was most suitable to handle the different mechanisms. Relevant material properties were defined, and a basis for geomechanical engineering of drilling and production of the HPHT reservoir was established.

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