Geological and mathematical description of the rocks strain during behaviour of the producing solid mass in compression (tension)

1 Sep 2020 / by YURI E. KATANOV, YURI V. VAGANOV, MARINA V. LISTAK

Abstract: A new approach is presented for studying the patterns of structural changes in reservoirs in the process of volumetric strains of a producing solid mass during its compression (behaviour in tension) strain according to the identified lithological types limited to sedimentary rocks of Western Siberia. Object: The purpose of this study is to develop analytical expressions in the study of volumetric strain of reservoir rocks (the beginning of dilatancy) in accordance with the individual breakdown point of lithological types of the producing solid mass during its compression (behaviour in tension) strain Methods: The mathematical methods used in this scientific work are presented by the probability theory, and the geo-mechanical features of sedimentary rocks are studied on the basis of the kinetic theory of solids destruction. Findings: Individual patterns of changes have been revealed in the reservoirs breakdown point during the transition from low-permeability to medium- and high permeability. The time of the initial development of volumetric strains (the beginning of dilatancy) in sand shale reservoirs is calculated. Conclusions: The obtained patterns indicate the fact that low-permeability, medium-permeability and high permeability rocks should be considered separately when studying the work of the pay zone on tension (this geo-mechanical process will be characteristic of the production wells operation) and on compression (this geo-mechanical process will be characteristic of the injection wells operation).

Keywords: Strain: Eigenpolarization parameter; sand shale reservoir; producing solid mass; compression and tension of the solid mass; permeability.

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