Rock mechanical properties introduced terms such as strength, elastic modulus and Poisson’s ratio, etc. which are important in petroleum engineering. The determination of reservoir’s mechanical properties is critical to reduce drilling risk and maximize well and reservoir productivity. Estimates of rock mechanical properties are crucial to drilling programs, well placement, and well-completion design. Rocks are heterogeneous and anisotropic materials. Therefore, rock mechanical properties vary not only with rock types, but also with measurement method, samples geometric dimension (sample length to diameter ratio and size), and other factors. In this study, uniaxial compressive tests were conducted on 31 different dimensions of Berea sandstone samples and 16 different dimensions of Eagle Ford shale cores to investigate the sample geometric effects on rock mechanical properties, including unconfined compressive strength, Young’s Modulus and Poisson’s ratio.

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