Vol. 4 pp. 252-264

R. H. Nizaev, L. G. Rakhmaev, Yu. A. Gutorov, G. V. Alexandrov

THE DETERMINATION OF THE OPTIMAL BOTTOM-HOLE PRESSURE FOR SELF-INDUCED HYDROFRACTURING OF WATER-FLOODED TERRIGENOUS RESERVOIRS IN ROMASHKINSKOYE OIL FIELD USING SIMULATION MODEL

Annotation. The objective of this work is to increase oil recovery efficiency by improving water injection system for mature oil fields. The ROXAR software package was used to build a geological model of a water-flooded reservoir in Pashian horizon of Vostochno-Leninogorskaya Area in the Romashkinskoye oil field. A digital simulation model was generated based on the geological model. This model was used for numerical studies of water injection at various injected volumes. To provide maximum agreement between calculated and actual data, relative permeability functions were adjusted to oil and water production history. 3D model was history matched by regions and by wells. History matching was based on monthly production rates. It revealed generation of self-induced hydrofracturing in wells. Ultimate watercut for the forecast period was set at 0.985. When using experimental data in numerical calculations, reservoir self-induced hydrofracturing has been under the assumption. The criterion for generation of this type of fracturing is attaining 35 MPa bottomhole pressure in injection well no. 6421. Based on reservoir simulation results, the authors have drawn a conclusion that in case of self-induced hydrofracturing in injection well no.6421 with 35 MPa bottomhole pressure, oil reserve production rate is higher due to a more uniform reservoir sweep, which results in increased current oil recovery factor.

Key words: self-induced hydraulic fracturing, geologic and fluid flow model, sweep efficiency, history matching, oil recovery factor, reservoir pressure, bottomhole pressure, production of reserves.

For citation: Nizaev R. H., Rakhmaev L. G., Gutorov Yu. A., Alexandrov G.V. [The determination of the optimal bottom-hole pressure for self-induced hydrofracturing of water-flooded terrigenous reservoirs in Romashkinskoye oil field using simulation model] Upravlenie tekhnosferoi, 2021, vol. 4, issue 3. (In Russ.) Available at: https://technosphere-ing.ru pp. 252 – 264. DOI: 10.34828/UdSU.2021.45.31.005

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About the Authors

Nizaev Ramil Khabutdinovich,

Doctor of Technical Sciences, Associate Professor, Lead Researcher of Geological and Reservoir Simulation Laboratory of Reservoir Engineering Department, TatNIPIneft Institute 32 Djalil Str., Bugulma, 423236, Republic of Tatarstan, TatNIPIneft Institute, Russia.

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Lenar Gambarovich Rakhmaev,

Chief Specialist, Department of Planning and Geological Support of Well Repairs of the V.D. Shashin GTM Department of PJSC Tatneft, Almetyevsk, Republic of Tatarstan, Russia.

Yuliy A. Gutorov

Doctor of Technical Sciences, Deputy Director for Research, Regional Coordination Scientific and Technical Center "Oil Valley", Oktyabrsky, Republic of Bashkortostan, Russia.

Georgy Vladimirovich Alexandrov,

Junior Researcher at the Laboratory of Geological and Hydrodynamic Modeling of the Oil Field Development Department of the TatNIPIneft Institute, postal address: 32 M. Jalil str., TatNIPIneft Institute, Bugulma, 423236, Republic of Tatarstan, Russia.

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