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Journal of Mining Sciences

2019 year, number 5

STRESS-PERMEABILITY DEPENDENCE IN GEOMATERIALS FROM LABORATORY TESTING OF CYLINDRICAL SPECIMENS WITH CENTRAL HOLE

L. A. Nazarova1, L. A. Nazarov1, N. A. Golikov2,3, A. A. Skulkin1
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630091 Russia
2Trofimuk Institute of Oil&Gas Geology and Geophysics, Novosibirsk, 630090 Russia
3Novosibirsk State Technical University, Novosibirsk, 630073 Russia
Keywords: Пороупругая среда, фильтрация, лабораторный эксперимент, криогель, дисковый образец, проницаемость, эффективное напряжение, Poroelastic medium, flow, laboratory test, cryogel, disc specimen, permeability, effective stress

Abstract

The laboratory setup is designed and manufactured to carry out permeability tests of cylindrical specimens with central hole modeling performance conditions of real producing wells under nonuniform stresses. The series of tests is accomplished with artificial specimens made of medium-grain sand conditioned by cryogel. The empirical dependence of permeability on effective stress is found; it is approximated by an exponential function with coefficient α = 0.0021 MPa-1, which is an order of magnitude higher than α estimated based on compressibility of geomaterials and rocks.