Reservoir rocks’ wettability and residual oil saturation in heterogeneous clastic Devonian layers of Romashkinskoye oil field

UDK: 622.276.031.011.43
DOI: 10.24887/0028-2448-2019-4-54-57
Key words: wettability, clastic reservoir, clay content, residual oil saturation, hydrophilicity, hydrophobicity
Authors: T.N. Yusupova (A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center of RAS, RF, Kazan), Yu.M. Ganeeva (A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center of RAS, RF, Kazan), E.E. Barskaya (A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center of RAS, RF, Kazan), E.S. Okhotnikova (A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center of RAS, RF, Kazan), A.Kh. Timirgalieva (A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center of RAS, RF, Kazan), R.R. Ibatullin (TAL Oil Ltd., Calgary, Canada), G.V. Romanov (A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center of RAS, RF, Kazan)

Wettability is one of the main parameters affecting the distribution and flow of fluids in a porous medium, and has a great influence on the dynamics of the oil field development, especially when waterflooding and enhanced oil recovery methods are used. The knowledge based on theoretical and experimental studies allowed us to conclude that wettability is determined by the historical interaction of the reservoir rock and fluids, surface properties of reservoir rocks’ pore channels, and physical and chemical properties of the oil. In this regard, it is extremely important to study the relationship of wettability with the pore space structure, the mineral composition of the reservoir rock and the residual oil saturation in the conditions of intensive fluid displacement by waterflooding.

The core samples were selected in two wells through the crossection of heterogeneous clastic layers D1 in South-Romashkino and West-Leninogorsk areas of the Romashkinskoye oil field. There were determined wettability, the clay content on the structure of the pore space and the model residual oil saturation and oil displacement efficiency in these samples after extraction of organic matter. The insoluble organic substance formed by the irreversible adsorption of oil components on the clay mineral surface and carbene-carboid compounds formed from asphaltenes after prolonged development of the oil reservoir by flooding with insufficiently treated river water was noticed in the rock, the presence of which modified the wettability of the rocks in the direction of increasing hydrophobicity. It was confirmed that hydrophilicity was more typical for rock samples with smaller pore radius. It was shown that the wettability of the reservoir correlated with the permeability and pore size and that the residual oil saturation increased in the more hydrophilic and less permeable parts of the reservoir. No direct correlation between the wettability and clay content was detected. The obtained results should be taken into account in developing technological solutions for waterflooding and enhanced oil recovery.

References

1. Anderson W.A., Wettability literature survey, Part 1. Rock/oil/brine interaction and the effects of core handling on wettability, JPT, 1986, October, pp. 1125-1622.

2. Abdalla V. et al., Fundamentals of wettability (In Russ.), Neftegazovoe obozrenie, 2007, V. 19, no. 2 (Summer), pp. 54–75.

2. Ding H., Rahman S., Experimental and theoretical study of wettability alteration during low salinity water flooding-an state of the art review, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2017, V. 520, pp. 622–639.

4. Buckley J.S. Liu Y., Monsterleet S., Mechanisms of wetting alteration by crude oils, SPE 37230-PA, 1998.

5. Mikhaylov N.N., Dzhemesyuk A.V., Kol'chitskaya T.N., Semenova N.A., Izuchenie ostatochnogo neftenasyshcheniya razrabatyvaemykh plastov (The study of residual oil saturation of developed reservoirs), Moscow: Publ. of VNIIOENG, 1990, 60 p.

6. Zlobin A.A., Yushkov I.R., About the mechanism of hydrophobization of surface of rock in oil and gas reservoirs (In Russ.), Vestnik Permskogo universiteta. Geologiya, 2014, V. 3(24), pp. 68–79.

7. Chena Y., Xiea Q., Saria A. et al., Oil/water/rock wettability: Influencing factors and implications for low salinity water flooding in carbonate reservoirs, Fuel, 2018, V. 215, pp. 171–177.

8. Chandrasekhar S., Sharma H., Mohanty K.K., Dependence of wettability on brine composition in high temperature carbonate rocks, Fuel, 2018, V. 225, pp. 573–587.

9. Zhang Y., Chen M., Jin Y. et al., Experimental study and artificial neural network simulation of the wettability of tight gas sandstone formation, Journal of Natural Gas Science and Engineering, 2016, V. 34, pp. 387–400.

10. Yusupova T.N., Ganeeva Yu.M., Romanov G.V., Barskaya E.E., Fiziko-khimicheskie protsessy v produktivnykh neftyanykh plastakh (Physical and chemical processes in the productive oil reservoirs), Moscow: Nauka Publ., 2015, 412 p.

11. Yusupova T.N., Romanova U.G., Gorbachuk V.V. et al., Estimation of the adsorption capacity of oil-bearing rock: a method and prospects, J. of Pet. Sci. and Eng., 2002, V. 33, no. 1–3, pp. 173–183.

12. Romanov G.V., Lebedev N.A., Yusupova T.N. et al., Physical and chemical problems of IOR and a combined approach to selection of technologies for hardly recoverable oils, Progress in Mining and Oilfield Chemistry, 2001, V. 3, pp. 175–182.

13. Yusupova T.N., Ganeeva Yu.M., Barskaya E.E. et al., Formation of the composition of unrecoverable residual oils in productive Devonian reservoirs of the Romashkinskoe oil field (In Russ.), Neftekhimiya = Petroleum Chemistry, 2004, V. 44, no. 2, pp. 103–109.

14. Mikhaylov N.N., Kol'chitskaya T.I., Dzhemesyuk A.V., Semenova N.A., Fiziko-geologicheskie problemy ostatochnoy neftenasyshchennosti (Physical-geological problems of residual oil saturation), Moscow: Nauka Publ., 1993, 174 p.

15. Mikhaylov N.N., Kuz'min V.A., Motorova K.A., Sechina L.S., The influence of the microstructure of the pore space on the hydrophobization oil and gas reservoirs (In Russ.), Vestnik MGU. Ser. 4. Geologiya = Moscow University Geology Bulletin, 2016, no. 4, pp. 67–75.

Wettability is one of the main parameters affecting the distribution and flow of fluids in a porous medium, and has a great influence on the dynamics of the oil field development, especially when waterflooding and enhanced oil recovery methods are used. The knowledge based on theoretical and experimental studies allowed us to conclude that wettability is determined by the historical interaction of the reservoir rock and fluids, surface properties of reservoir rocks’ pore channels, and physical and chemical properties of the oil. In this regard, it is extremely important to study the relationship of wettability with the pore space structure, the mineral composition of the reservoir rock and the residual oil saturation in the conditions of intensive fluid displacement by waterflooding.

The core samples were selected in two wells through the crossection of heterogeneous clastic layers D1 in South-Romashkino and West-Leninogorsk areas of the Romashkinskoye oil field. There were determined wettability, the clay content on the structure of the pore space and the model residual oil saturation and oil displacement efficiency in these samples after extraction of organic matter. The insoluble organic substance formed by the irreversible adsorption of oil components on the clay mineral surface and carbene-carboid compounds formed from asphaltenes after prolonged development of the oil reservoir by flooding with insufficiently treated river water was noticed in the rock, the presence of which modified the wettability of the rocks in the direction of increasing hydrophobicity. It was confirmed that hydrophilicity was more typical for rock samples with smaller pore radius. It was shown that the wettability of the reservoir correlated with the permeability and pore size and that the residual oil saturation increased in the more hydrophilic and less permeable parts of the reservoir. No direct correlation between the wettability and clay content was detected. The obtained results should be taken into account in developing technological solutions for waterflooding and enhanced oil recovery.

References

1. Anderson W.A., Wettability literature survey, Part 1. Rock/oil/brine interaction and the effects of core handling on wettability, JPT, 1986, October, pp. 1125-1622.

2. Abdalla V. et al., Fundamentals of wettability (In Russ.), Neftegazovoe obozrenie, 2007, V. 19, no. 2 (Summer), pp. 54–75.

2. Ding H., Rahman S., Experimental and theoretical study of wettability alteration during low salinity water flooding-an state of the art review, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2017, V. 520, pp. 622–639.

4. Buckley J.S. Liu Y., Monsterleet S., Mechanisms of wetting alteration by crude oils, SPE 37230-PA, 1998.

5. Mikhaylov N.N., Dzhemesyuk A.V., Kol'chitskaya T.N., Semenova N.A., Izuchenie ostatochnogo neftenasyshcheniya razrabatyvaemykh plastov (The study of residual oil saturation of developed reservoirs), Moscow: Publ. of VNIIOENG, 1990, 60 p.

6. Zlobin A.A., Yushkov I.R., About the mechanism of hydrophobization of surface of rock in oil and gas reservoirs (In Russ.), Vestnik Permskogo universiteta. Geologiya, 2014, V. 3(24), pp. 68–79.

7. Chena Y., Xiea Q., Saria A. et al., Oil/water/rock wettability: Influencing factors and implications for low salinity water flooding in carbonate reservoirs, Fuel, 2018, V. 215, pp. 171–177.

8. Chandrasekhar S., Sharma H., Mohanty K.K., Dependence of wettability on brine composition in high temperature carbonate rocks, Fuel, 2018, V. 225, pp. 573–587.

9. Zhang Y., Chen M., Jin Y. et al., Experimental study and artificial neural network simulation of the wettability of tight gas sandstone formation, Journal of Natural Gas Science and Engineering, 2016, V. 34, pp. 387–400.

10. Yusupova T.N., Ganeeva Yu.M., Romanov G.V., Barskaya E.E., Fiziko-khimicheskie protsessy v produktivnykh neftyanykh plastakh (Physical and chemical processes in the productive oil reservoirs), Moscow: Nauka Publ., 2015, 412 p.

11. Yusupova T.N., Romanova U.G., Gorbachuk V.V. et al., Estimation of the adsorption capacity of oil-bearing rock: a method and prospects, J. of Pet. Sci. and Eng., 2002, V. 33, no. 1–3, pp. 173–183.

12. Romanov G.V., Lebedev N.A., Yusupova T.N. et al., Physical and chemical problems of IOR and a combined approach to selection of technologies for hardly recoverable oils, Progress in Mining and Oilfield Chemistry, 2001, V. 3, pp. 175–182.

13. Yusupova T.N., Ganeeva Yu.M., Barskaya E.E. et al., Formation of the composition of unrecoverable residual oils in productive Devonian reservoirs of the Romashkinskoe oil field (In Russ.), Neftekhimiya = Petroleum Chemistry, 2004, V. 44, no. 2, pp. 103–109.

14. Mikhaylov N.N., Kol'chitskaya T.I., Dzhemesyuk A.V., Semenova N.A., Fiziko-geologicheskie problemy ostatochnoy neftenasyshchennosti (Physical-geological problems of residual oil saturation), Moscow: Nauka Publ., 1993, 174 p.

15. Mikhaylov N.N., Kuz'min V.A., Motorova K.A., Sechina L.S., The influence of the microstructure of the pore space on the hydrophobization oil and gas reservoirs (In Russ.), Vestnik MGU. Ser. 4. Geologiya = Moscow University Geology Bulletin, 2016, no. 4, pp. 67–75.


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