Applying proxy-modeling tools to estimate the effective injection factor for an oil field

About the authors:

Vitaly P. Kosyakov, Cand. Sci. (Phys.-Math.), Senior Researcher, Tyumen Branch of the Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences; Associate Professor, Department of Oil and Gas Flow Metering, University of Tyumen; eLibrary AuthorID, Web of Science ResearcherID; lik.24@yandex.ru; ORCID: 0000-0002-2297-408X

Emil N. Musakaev, Cand. Sci. (Tech.), Researcher, Tyumen Division of Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences; Specialist in Integrated Modeling of PITC Geofizika LLC; musakaev91@gmail.com

Inna V. Gaydamak, Specialist in Integrated Modeling of PITC Geofizika LLC; Senior Lecturer, University of Tyumen; gaydamakiv@mail.ru

Abstract:

This work is devoted to the joint use of physically based proxy models of different levels of complexity to determine the effective injection ratio factor. Effective injection factor is a parameter that reflects the proportion of injected fluid that enters the reservoir and does useful work to maintain reservoir pressure and displace oil from the reservoir. The selection of the effective injection factor when using a full-scale hydrodynamic simulator is difficult due to the high requirements for computational and time resources. Therefore, to calculate this coefficient, it is justified to use the simplified proxy modeling approach, which allows to evaluate the desired parameter in an acceptable time frame. The task of finding the effective injection ratio is related to inverse problems. The following were used as proxy models: a material balance model for the field as a whole and for a system of hydrodynamically connected blocks, a capacitance-resistance model (CRM) and a two-dimensional filtration model. The order of the models corresponds to the hierarchical principle "from simple to complex". Based on the history of oil field development (production, fluid injection, reservoir and bottomhole pressure), the effective injection coefficients were obtained, they were compared, and the analysis of the results was carried out.

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