Assessment of surfactant polymer flooding of carbonate reservoirs with high reservoir temperature and formation salinity using single-well chemical tracer test results

UDK: 622.276.6 Пр.м

DOI: 10.24887/0028-2448-2026-5-90-95

Key words: surfactant-polymer flooding, oil displacement coefficient, hydrodynamic modeling, enhanced oil recovery methods, single-well chemical tracer test (SWCTT)

Authors: D.R. Altynbaeva (ZN STC LLC, RF, Moscow); D.S. Kruglov (ZN STC LLC, RF, Moscow); I.V. Tkachev (ZN STC LLC, RF, Moscow); A.R. Saitgareev (ZN STC LLC, RF, Moscow); E.S. Savchenko (VNIIneft-Western Siberia JSC, RF, Tyumen); O.N. Zoshchenko (RUSVIETPETRO JV LLC, RF, Moscow); D.M. Ponomarenko (RUSVIETPETRO JV LLC, RF, Moscow); G.V. Sansiev (Zarubezhneft JSC, RF, Moscow); A.A. Kozhemyakin (Zarubezhneft JSC, RF, Moscow)

The article is devoted to evaluating the surfactant polymer flooding technology effectiveness using single-well chemical tracer test technology (SWCTT). Currently, one of the main tasks in the oil industry is the development of enhanced oil recovery (EOR) methods to increase the period of profitable development of fields at a late stage of exploitation of carbonate reservoirs. Surfactant polymer flooding technology is being implemented at the field of RUSVIETPETRO JV LLC in order to increase oil displacement coefficient. This field is characterized by high reservoir temperatures (70 °С), high salinity formation water (209 g/l), and a hydrophobic carbonate rock. The pilot program stage enables to test the selected compositions in the real conditions of the field, to remove existing uncertainties and decide whether to switch to a pilot project or full-scale implementation. To preliminarily assess the effect of injecting a surfactant-polymer composition, a SWCTT is carried out, which enables to estimate the displacement coefficient in the near-wellbore zone by comparing the residual oil saturation before and after injecting the EOR agent. This paper describes an approach to planning and interpretation of SWCTT: well selection, design features, evaluating the effectiveness of injection of a surfactant polymer composition and the description of parameters that affect the correctness of residual oil saturation evaluation. The SWCTT design and interpretation are made using hydrodynamic model. The selected surfactant-polymer composition showed high efficiency, providing an increase in the oil displacement coefficient by 16 %.

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EDN: WSNPUN

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