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EOR methods potential on complex carbonate oilfields of Zarubezhneft JSC

UDK: 622.276.6
DOI: 10.24887/0028-2448-2018-9-48-51
Key words: enhanced oil recovery (EOR) methods, digital core, carbonate oilfields, simulation, chart of technologies
Authors: A.V. Solovyev (VNIIneft JSC, RF, Moscow), M.M. Hairullin (VNIIneft JSC, RF, Moscow), A.V. Zhirov (VNIIneft JSC, RF, Moscow), I.S. Afanasiev (Zarubezhneft JSC, RF, Moscow), G.D. Fedorchenko (Zarubezhneft JSC, RF, Moscow)

Digital lab project was launched in 2018. The most important part of the project is the development of digital core software for EOR methods using micro-level simulation. All accumulated knowledge about the carbonate reservoirs forms the basis for EOR technologies research plan. The first step of the plan was to summarize and classify EOR technologies with participation of the international EOR experts. EOR techniques were defined. To unify EOR technologies research process we develop a template workflow. Using this template the company launched multiple research process on key EOR technologies for carbonate reservoirs. While designing a carbonate field development plan, one can face a variety of problems associated with reservoir complexity, heterogeneity and great uncertainty of main influencing on recovery factor parameters. A series of simulations, using a sector model of one of the oilfields, were carried out to demonstrate the importance of taking into account those parameters (fracturing, wettability etc.). It can be concluded, that the influence of wettability factor and pore volume structure have a critical impact on a selection of recovery mechanism. To understand the wettability of a reservoir all the existing data was summarized. A new approach to complex characterization of heterogeneity and anisotropy of carbonate reservoir properties has been proposed. This approach is based on a complex transition algorithm from micro to macro scale in simulation models. The problem of qualitative definition of reservoir parameters on every scale was defined and successfully solved.

References

1. Yudkina E., The modern approach to core data analysis application for studying of reserves structure of carbonate deposits of Zarubezhneft JSC (In Russ.), Neftyanoe Khozyaystvo = Oil Industry, 2016, no. 5, pp. 29-33.

2. Yudin. E. et al., Development of approach to modelling complex structure carbonate reservoirs using example of the Central Khoreyver uplift fields, SPE 187811-MS, 2017.

3. Kudryashov S.I., New approaches in physical modelling of enhanced oil recovery methods based on steam injection and high-pressure air injection for carbonate oil fields (In Russ.), Neftyanoe Khozyaystvo = Oil Industry, 2017, no. 8, pp. 25-29.

Digital lab project was launched in 2018. The most important part of the project is the development of digital core software for EOR methods using micro-level simulation. All accumulated knowledge about the carbonate reservoirs forms the basis for EOR technologies research plan. The first step of the plan was to summarize and classify EOR technologies with participation of the international EOR experts. EOR techniques were defined. To unify EOR technologies research process we develop a template workflow. Using this template the company launched multiple research process on key EOR technologies for carbonate reservoirs. While designing a carbonate field development plan, one can face a variety of problems associated with reservoir complexity, heterogeneity and great uncertainty of main influencing on recovery factor parameters. A series of simulations, using a sector model of one of the oilfields, were carried out to demonstrate the importance of taking into account those parameters (fracturing, wettability etc.). It can be concluded, that the influence of wettability factor and pore volume structure have a critical impact on a selection of recovery mechanism. To understand the wettability of a reservoir all the existing data was summarized. A new approach to complex characterization of heterogeneity and anisotropy of carbonate reservoir properties has been proposed. This approach is based on a complex transition algorithm from micro to macro scale in simulation models. The problem of qualitative definition of reservoir parameters on every scale was defined and successfully solved.

References

1. Yudkina E., The modern approach to core data analysis application for studying of reserves structure of carbonate deposits of Zarubezhneft JSC (In Russ.), Neftyanoe Khozyaystvo = Oil Industry, 2016, no. 5, pp. 29-33.

2. Yudin. E. et al., Development of approach to modelling complex structure carbonate reservoirs using example of the Central Khoreyver uplift fields, SPE 187811-MS, 2017.

3. Kudryashov S.I., New approaches in physical modelling of enhanced oil recovery methods based on steam injection and high-pressure air injection for carbonate oil fields (In Russ.), Neftyanoe Khozyaystvo = Oil Industry, 2017, no. 8, pp. 25-29.


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