Prospects for increasing oil recovery from long-term deposits with preliminary regulation of flooding intervals and subsequent cyclic flooding (using the example of fields in Western Siberia)

UDK: 622.276.43:531.312.2

DOI: 10.24887/0028-2448-2025-12-50-54

Key words: geological structure, deposit, oil and gas, field development, oil recovery, simulation, cyclic flooding, chemical methods of waterflooding (CMW), hydrodynamic methods for enhanced oil recovery (HMEOR)

Authors: D.A. Chudinov (Tyumen Branch of SurgutNIPIneft, Surgutneftegas PJSC, RF, Tyumen); A.V. Meer (Tyumen Branch of SurgutNIPIneft, Surgutneftegas PJSC, RF, Tyumen); I.A. Shepelev (Tyumen Branch of SurgutNIPIneft, Surgutneftegas PJSC, RF, Tyumen); I.Y. Eliseev (Tyumen Branch of SurgutNIPIneft, Surgutneftegas PJSC, RF, Tyumen); A.G. Pogorelcev (Tyumen Branch of SurgutNIPIneft, Surgutneftegas PJSC, RF, Tyumen); Y.G. Koval (Tyumen Branch of SurgutNIPIneft, Surgutneftegas PJSC, RF, Tyumen); S.R. Bembel (Tyumen Branch of SurgutNIPIneft, Surgutneftegas PJSC, RF, Tyumen)

Most of the oil and gas fields of Western Siberia have been developed since the 1970s. Currently, a significant part of these deposits is at the final stage of development, characterized by large recovery of oil and gas reserves and high waterlogging of the producing well stock. For the most comprehensive extraction of hydrocarbon reserves from fields that are in the late stages of development, chemical methods of waterflooding (CMW) regulation, hydrodynamic methods for enhanced oil recovery (HMEOR), thermal, gas and other methods are applied. The aim of this work is to increase oil recovery at site A characterized by fractured layers with heterogeneous permeability and oil saturation in one of the oil and gas condensate fields of the Surgut arch by sequentially applying CMW and HMEOR. The first stage of the proposed technology involves the use of CMW in injection wells to equalize the inflow profile. This technology is most effective in fractured and heterogeneous layers. At the second stage, HMEOR is conducted. This stage includes regulating the injection and fluid extraction modes by periodically shifting the injection front between two rows of injection wells with symmetrical cyclicity. The study identifies the most suitable areas of the field for testing the technology and calculates the optimal operating modes of the wells to achieve additional oil production.

References

1. Eremin N.A., Zolotukhin A.B., Nazarova L.N., Chernikov O.A., Vybor metoda vozdeystviya na neftyanuyu zalezh’ (Choice of method of oil reservoir stimulation), Moscow: Publ. of Gubkin University, 1995, 190 p.

2. Darishchev V.I., Sovremennye proekty KhMUN v Rossii (Modern projects of chemical EOR in Russia), Proceedings of International Scientific and Technical Conference on Chemical EOR, Kazan’, 2022.

3. Malinovskiy I.V., Avtomatizatsiya podbora khimicheskikh metodov uvelicheniya nefteotdachi na osnove otsenki ikh effektivnosti (Automation of the selection of chemical methods for enhanced oil recovery based on an assessment of their effectiveness), Proceedings of XXXlX scientific and technical conference of young scientists and specialists of Surgutneftegas PJSC, Surgut: Neft’ Priob’ya Publ., 2019, pp. 395–401.