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Direct measurement of the unjacketed pore modulus of porous solids


ABSTRACT: Pressure decline caused by the extraction of oil from deep sedimentary layers depends on the pore modulus Kpp, a poroelastic parameter that characterizes the effect of pressure change on pore volume under constant mean stress. Measurement of Kpp is difficult, however, as it requires calibration to account for fluid compressibility and compliance of the testing system. Nevertheless, knowing the easily measurable drained pore modulus Kp and adopting an assumption on the unjacketed pore modulus Ks?, it is possible to determine Kpp because these pore moduli are related. Previous work on indirectly estimating Ks? claimed that Ks? is strongly dependent on Terzaghi effective pressure P? and therefore not a constant; also, Ks? might be different from Ks, the solid bulk modulus of the major mineral constituent. We overcome the limitations of the indirect approach by directly measuring Ks?. The experiments reveal that Ks? is indeed a constant and that for an ideal porous rock, the assumption of

SUBMITTER: Tarokh A 

PROVIDER: S-EPMC6283901 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature

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