Enhanced oil recovery in carbonate fractured reservoirs by means of the multiple degassing mechanism

UDK: 622.276.43 5
DOI: 10.24887/0028-2448-2017-4-76-79
Key words: cyclic water flooding, fractured reservoir, multiple degassing, hydrodynamic simulation
Authors: K.O. Alekseeva, V.A. Baikov, A.V. Kolonskikh (RN-UfaNIPIneft LLC, RF, Ufa), V.V. Vodopianov (Ufa State Aviation Technical University, RF, Ufa)

The relevance of the investigated problem is caused by a great deal of carbonate reservoirs among the world oil reserves and the low efficiency of existing widespread reservoir engineering as applied to these reservoirs (e.g., flooding). There is therefore a need for creation of new and improvement of existing oil production technologies, taking into account the specificity of these reservoirs and permitting to increase the oil recovery factor.

The paper presents a technology of cyclic water flooding for fractured reservoir to increase the oil recovery factor. This technology is based on the mechanism of multiple oil degassing and consists in the multiple reservoir pressure passing through the bubble point pressure, which permits to enhance the oil recovery factor by means of multiple dissolved gas work.

In previous studies of the efficacy of single or cyclic fractured reservoir stimulation purposely oil-in-place degassing the detailed oil displacement simulation has not been conducted and only qualitative assessments of oil recovery factor, which allow to conclude about the appropriateness of proposed enhanced recovery methods, has been conducted. In this work, the leading method in the study of the problem is the method of hydrodynamic simulation. Using oil-wet fractured reservoir models the existing oil recovery methods, based on the oil degassing mechanism, has been compared. The cyclic recovery drive, proposed in this work, was the most effective in terms of enhanced oil recovery.

The estimation of the cyclic oil displacement parameters, which allow to enhance the oil recovery factor, has been conducted. One of these parameters is the minimum bottom-hole pressure in the displacement cycles. The simulation results showed that an optimal value of the minimum bottom-hole pressure in the displacement cycles, at which oil recovery factor becomes maximum, exist and it depends on the critical water saturation of the reservoir.

An optimized version of the cyclic recovery drive with a variable minimum bottom-hole pressure in the displacement cycles, which allows to get an additional increase of oil recovery factor, is proposed by authors.

Article submissions may be useful in designing of technological processes for fractured reservoir production using described technology of cyclic reservoir stimulation based on mechanism of the multiple oil degassing.

References

1. Sheng J.J., Enhanced oil recovery field case studies, Elsevier, 2013, 712 p.

2. Chernitskiy A.V., Geologicheskoe modelirovanie neftyanykh zalezhey massivnogotipa v karbonatnykh treshchinovatykh kollektorakh (Geologicalmodeling of oil deposits of massive type in carbonate fractured reservoirs),Moscow: Publ. of RMNTK Nefteotdacha, 2002, 254 p.

3. Golf-Racht T., Fundamentals of fractured reservoir engineering, Amsterdam,New York: Elsevier, 1982.

4. Donaldson E.C., Alam W., Wettability, Gulf Publishing Company, 2008, 360 p.

5. Surguchev M.L., Vtorichnye i tretichnye metody uvelicheniya nefteotdachiplastov (Secondary and tertiary methods of enhanced oil recovery),Moscow: Nedra Publ., 1985, 308 p.

6. Krylov A.P. et al., Proektirovanie razrabotki neftyanykh mestorozhdeniy.Printsipy i metody (Designing oil fields development. Principles and methods),Moscow: Publ. of Gostoptekhizdat, 1962.

7. Khristianovich S.A., Kovalenko Yu.F., On enhanced oil recovery (In Russ.)Neftyanoe khozyaystvo = Oil Industry, 1988, no. 10, pp. 2528.

8. Pirson S.J., Oil reservoir engineering, McGraw-Hill, New York City, 1958.

9. Stasenkov V.V., Salazhev V.M., Veremko N.A. et al., Estimation of efficiencyof displacement of degassed oil by water (In Russ.), Neftyanoe khozyaystvo =Oil Industry, 1995, no. 12, pp. 2528.

10. Vakhitov G.G. et al., Razrabotka mestorozhdeniy pri zaboynom davleniinizhe davleniya nasyshcheniya (Development of deposits when bottomholepressure below saturation pressure), Moscow: Nedra Publ., 1982, pp. 205212.

11. Certificate of authorship no. 947399 SSSR, Method for developing oil andgas deposits, Authors: Klyarovskiy G.V., Parakhin B.G.12. Patent no. 2114986 RF, Method for development of oil deposit, Inventors:Salazhev V.M., Lisovskiy N.N., Stasenkov V.V. et al.

13. Brilliant L.S., Evdoshchuk P.A., Plitkina Yu.A. et al., Effective brownfield developmentby the means of oil resaturation with evolved gas in situ (In Russ.),Neftyanoe khozyaystvo = Oil Industry, 2014, no. 4, pp. 5459.

14. Buleyko V.M., Zakonomernosti fazovykh prevrashcheniy uglevodorodnykhsmesey v neftegazonosnykh plastakh razrabatyvaemykh mestorozhdeniy(po eksperimental'nym dannym) (Regularities of phase transformations of hydrocarbonmixtures in oil and gas bearing formations of the developed deposits(according to experimental data)): thesis of doctor of technical science,Moscow, 2005.

The relevance of the investigated problem is caused by a great deal of carbonate reservoirs among the world oil reserves and the low efficiency of existing widespread reservoir engineering as applied to these reservoirs (e.g., flooding). There is therefore a need for creation of new and improvement of existing oil production technologies, taking into account the specificity of these reservoirs and permitting to increase the oil recovery factor.

The paper presents a technology of cyclic water flooding for fractured reservoir to increase the oil recovery factor. This technology is based on the mechanism of multiple oil degassing and consists in the multiple reservoir pressure passing through the bubble point pressure, which permits to enhance the oil recovery factor by means of multiple dissolved gas work.

In previous studies of the efficacy of single or cyclic fractured reservoir stimulation purposely oil-in-place degassing the detailed oil displacement simulation has not been conducted and only qualitative assessments of oil recovery factor, which allow to conclude about the appropriateness of proposed enhanced recovery methods, has been conducted. In this work, the leading method in the study of the problem is the method of hydrodynamic simulation. Using oil-wet fractured reservoir models the existing oil recovery methods, based on the oil degassing mechanism, has been compared. The cyclic recovery drive, proposed in this work, was the most effective in terms of enhanced oil recovery.

The estimation of the cyclic oil displacement parameters, which allow to enhance the oil recovery factor, has been conducted. One of these parameters is the minimum bottom-hole pressure in the displacement cycles. The simulation results showed that an optimal value of the minimum bottom-hole pressure in the displacement cycles, at which oil recovery factor becomes maximum, exist and it depends on the critical water saturation of the reservoir.

An optimized version of the cyclic recovery drive with a variable minimum bottom-hole pressure in the displacement cycles, which allows to get an additional increase of oil recovery factor, is proposed by authors.

Article submissions may be useful in designing of technological processes for fractured reservoir production using described technology of cyclic reservoir stimulation based on mechanism of the multiple oil degassing.

References

1. Sheng J.J., Enhanced oil recovery field case studies, Elsevier, 2013, 712 p.

2. Chernitskiy A.V., Geologicheskoe modelirovanie neftyanykh zalezhey massivnogotipa v karbonatnykh treshchinovatykh kollektorakh (Geologicalmodeling of oil deposits of massive type in carbonate fractured reservoirs),Moscow: Publ. of RMNTK Nefteotdacha, 2002, 254 p.

3. Golf-Racht T., Fundamentals of fractured reservoir engineering, Amsterdam,New York: Elsevier, 1982.

4. Donaldson E.C., Alam W., Wettability, Gulf Publishing Company, 2008, 360 p.

5. Surguchev M.L., Vtorichnye i tretichnye metody uvelicheniya nefteotdachiplastov (Secondary and tertiary methods of enhanced oil recovery),Moscow: Nedra Publ., 1985, 308 p.

6. Krylov A.P. et al., Proektirovanie razrabotki neftyanykh mestorozhdeniy.Printsipy i metody (Designing oil fields development. Principles and methods),Moscow: Publ. of Gostoptekhizdat, 1962.

7. Khristianovich S.A., Kovalenko Yu.F., On enhanced oil recovery (In Russ.)Neftyanoe khozyaystvo = Oil Industry, 1988, no. 10, pp. 2528.

8. Pirson S.J., Oil reservoir engineering, McGraw-Hill, New York City, 1958.

9. Stasenkov V.V., Salazhev V.M., Veremko N.A. et al., Estimation of efficiencyof displacement of degassed oil by water (In Russ.), Neftyanoe khozyaystvo =Oil Industry, 1995, no. 12, pp. 2528.

10. Vakhitov G.G. et al., Razrabotka mestorozhdeniy pri zaboynom davleniinizhe davleniya nasyshcheniya (Development of deposits when bottomholepressure below saturation pressure), Moscow: Nedra Publ., 1982, pp. 205212.

11. Certificate of authorship no. 947399 SSSR, Method for developing oil andgas deposits, Authors: Klyarovskiy G.V., Parakhin B.G.12. Patent no. 2114986 RF, Method for development of oil deposit, Inventors:Salazhev V.M., Lisovskiy N.N., Stasenkov V.V. et al.

13. Brilliant L.S., Evdoshchuk P.A., Plitkina Yu.A. et al., Effective brownfield developmentby the means of oil resaturation with evolved gas in situ (In Russ.),Neftyanoe khozyaystvo = Oil Industry, 2014, no. 4, pp. 5459.

14. Buleyko V.M., Zakonomernosti fazovykh prevrashcheniy uglevodorodnykhsmesey v neftegazonosnykh plastakh razrabatyvaemykh mestorozhdeniy(po eksperimental'nym dannym) (Regularities of phase transformations of hydrocarbonmixtures in oil and gas bearing formations of the developed deposits(according to experimental data)): thesis of doctor of technical science,Moscow, 2005.



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