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A methodology to estimate permeability in porous and fissured rock specimens at laboratory scale

Estevez-Ventosa Xian, Gonzalez-Molano Nubia Aurora, Blazquez-Pascual Vanesa, Alverellos Jose, Alejano Leandro R.

Archives of Mining Sciences

2020

Vol. 65, no. 4

821--833

The correct management of underground works, petroleum and gas reservoirs and geothermal appli-cations relies on the hydromechanical behaviour of rock masses. We describe a laboratory approach to measuring permeability for different types of rock specimens. A laboratory system was designed and set up using rock mechanics equipment (a servo-controlled hydraulic press, a Hoek cell, a pump for injecting water and a scale for measuring the volume of water flow). To verify the validity of the permeability measurements, tests were carried out on a reference porous rock (Corvio sandstone), with results showing good agreement with those published in the literature. Tests were subsequently carried out on artificially fissured granite specimens with different joint patterns, submitted to various confinement stresses up to 20 MPa. Results showed good agreement with traditional Klinkenberg test results. Other tests done with artificially fissured specimens are described for demonstrative purposes.