«Proceedings of Gubkin University»

Peculiarities of mathematical modeling of core experiments for displacement of heavy oils using solvent gases

UDC: 532.546
DOI: 10.33285/2073-9028-2023-2(311)-128-142

Authors:

¹ National University of Oil and Gas “Gubkin University”, Moscow, Russian Federation

Keywords: high viscosity oil, methods of enhanced oil recovery, water and gas impact, nitrogen, mathematical modeling of core experiments, nonlinear filtration law

Annotation:

The effectiveness of methods for displacing high-viscosity oils using various solvents in deposits of hard-to-recover reserves was analyzed, considering the type of reservoir and the features of its interaction with the displacing agent and formation fluid. A mathematical model was constructed that makes it possible to describe the nonlinear nature of unsteady filtration flows in a wide range of rheological laws in porous media of various initial structures. The change in the filtration properties of the porous skeleton during the transformation of the pore size distribution curve was considered taking into account the interaction with the displacing agent (surfactant solutions, polymers, gases, acid compositions of various consistency). The authors created original computational codes that allow solving direct and inverse problems of filtration theory, considering thermal effects, the influence of the wellbore, the manifestation of nonlinearity in filtration, the Joule – Thompson effect and changes in the porous structure. The simulation modeling of nitrogen injection showed good agreement with the results of physical experiments using the Slim-tube method, provided that a nonlinear filtration law with a continuously changing apparent viscosity is used.

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