Evolution of Stresses and Permeability of Fractured-and-Porous Rock Mass around a Production Well
L. A. NAZAROVA1,2, L. A. NAZAROV1,2
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
2Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090 Russia
Keywords: трещиновато-пористый породный массив, пороупругость, поропластичность, двойная пористость, фильтрация, эволюция напряжений, зона разрушения, численное моделирование, fractured-and-porous rock mass, pore elasticity, pore plasticity, double porosity, seepage, stress evolution, fracture zone, numerical modeling
Abstract
The authors model deformation and mass transfer in jointed and porous rock mass around a production well. The modeling based on the concept of a continuum with double porosity uses an original method with finite difference solution of mass transfer equations and analytical solution of pore elastoplasticity equations. From the numerical experiments, dimensions of irreversible straining zones in the well bore zone grow with the parameter Bio. The estimate of the reservoir permeability decline in the course of operation, obtained from the pore elasticity and pore plasticity models, qualitatively agrees with the in situ observation data.
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