Poroelastic response of saturated rock
2016-12
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Poroelastic response of saturated rock
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2016-12
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The existence of fluid in porous medium affects its mechanical response. Changes in pore pressure, defined as the pressure of the fluid contained within the pore space, induces expansion or compaction. Compression of the medium can also raise the pore pressure if the fluid does not have enough time to escape the pore network. These coupled mechanisms add a time-dependent character to the mechanical properties that can be a major concern in many applications, such as oil and gas exploration and recovery. This research is concentrated on determining the poroelastic parameters of fluid-saturated rock, and more specifically, directly measuring the so-called unjacketed pore modulus. Several indirect measurement of this parameter using relevant poroelastic constants have been performed, but limitations of this approach prevent a reliable estimation. Detailed poroelastic experiments, including hydrostatic compression and conventional triaxial compression under limiting conditions of drained, undrained, and unjacketed response are performed on two porous sandstones, Dunnville and Berea, as well as a synthetic silica specimen. The experimental data clearly show that for Dunnville sandstone and synthetic silica, both approximately representing an ideal porous material with a fully connected pore space, the unjacketed pore modulus is indeed equal to the unjacketed bulk modulus. The existence of non-homogeneities such as non-connected pores and compliant minerals in Berea sandstone cause a slight difference between these two moduli. Complete characterization of a transversely isotropic poroelastic behavior of Dunnville sandstone is also presented. The proposed experimental methods along with the results obtained from this research can be implemented for testing rock from the field. Furthermore, the developed techniques are applicable for the prediction of the mechanical response of fluid-filled carbon-capturing rock.
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University of Minnesota Ph.D. dissertation. December 2016. Major: Civil Engineering. Advisor: Joseph Labuz. 1 computer file (PDF); viii, 126 pages.
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Tarokh, Ali. (2016). Poroelastic response of saturated rock. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/211805.
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