Factors affecting the phase inversion point shift and the viscosity of oil-water emulsions in oilfield systems

UDK: 622.276.8
DOI: 10.24887/0028-2448-2021-10-116-121
Key words: phase inversion point, oil-water emulsion viscosity, interfacial tension, pH, emulsion shear rate, emulsion mixing intensity, water phase density, water cut
Authors: K.S. Fot (Kondaneft Oil Company JSC, RF, Khanty-Mansiysk), N.O. Vahrusheva (Izhevsk Petroleum Research Center CJSC, RF, Izhevsk), S.P. Chirkova (Izhevsk Petroleum Research Center CJSC, RF, Izhevsk), A.V. Kuporosova (Izhevsk Petroleum Research Center CJSC, RF, Izhevsk), S.G. Mukhametdinova (Izhevsk Petroleum Research Center CJSC, RF, Izhevsk)

The object of the study is high-viscosity emulsions consisting of two immiscible liquids – oil and water. Factors affecting both the viscosity of such emulsions and the phase inversion point are considered. It was experimentally established that the phase inversion point is within the product water content from 50 to 80% and is characterized by the highest viscosity values of oil-water emulsions. However, under certain factors affecting the dispersion system, this range can increase to 85%. The influence of such parameters as water density, oil density, oil viscosity, mixing intensity, liquid shear rate, interfacial tension at the oil-water interface, acidity (pH) of the water phase on the rheological behavior of dispersed systems with respect to the displacement of the phase inversion point and the viscosity of oil-water emulsions is studied. The rheological dependences of the dynamic viscosity of oil-water emulsions on the above-mentioned factors were obtained. The factors that affect the phase inversion of dispersed systems and the value of the dynamic viscosity of oil-water emulsions are determined. The criteria for the influence of these factors on the displacement of the inversion point of the phases of the emulsions are revealed. An empirical equation is derived that takes into account the effect of the displacement of the phase inversion point as a function of the difference in the densities of oil and water. The main conclusions on the phase inversion offset are presented, which can be used to develop decision-making algorithms for predicting the phase inversion point and the dynamic viscosity of oil-water emulsions both during production and transportation, and during oil preparation.

References

1. Valiakhmetov R.I., Zdolnik S.E., Litvinenko K.V., A systematic approach to the choice of technologies for preventing complications in well oil production (In Russ.), Inzhenernaya praktika, 2016, no.4.

2. Medvedev V.F., Sbor i podgotovka neustoychivykh emul'siĭ na promyslakh (Gathering and preparation of unstable emulsions in the fields), Moscow: Nedra Publ., 1987, 144 p.

3.  Sakharov V.A., Mokhov M.A., Gidrodinamika gazozhidkostnykh smesey v vertikal'nykh trubakh i promyslovykh pod"emnikakh (Hydrodynamics of gas-liquid mixtures in vertical pipes and field hoists), Moscow: Publ. of Gubkin University, 2004, 398 p.

4. Ngan K.H., Phase Inversion in dispersed liquid-liquid pipe flow: PhD Thesis, Department of Chemical Engineering, University College London, 2010.

5. Matar O.K., Hewitt G.F., Ortiz E.S., Phase inversion in liquid-liquid dispersions, Department of Chemical Engineering, Imperial College, London.

6. Arirachakaran S., Oglesby K.D., Malinowsky M.S. et al., An analysis of oil/water flow phenomena in horizontal pipes, SPE-18836-MS, 1989, DOI: http://dx.doi.org/10.2118/18836-MS

7. Alboudwarej H., Shahraki A. et al., Rheology of heavy-oil emulsions,

SPE-97886-PA, 2007, DOI:10.2118/97886-PA

8. Wang W., W Cheng., Li K. et al., Flow patterns transition law of oil-water two-phase flow under a wide range of oil phase viscosity condition, Journal of Applied Mathematics, 2013, no. 8, pp. 1–8, DOI: http://dx.doi.org/10.1155/2013/291217.

9. Odozi U.A., Three-phase gas/liquid/liquid slug flow: PhD Thesis, Chem. Eng. Dept., Imperial College, London, UK, 2000.

10. Sakhabutdinov R.Z., Gubaydulin F.R., Ismagilov I.Kh., Kosmacheva T.F., Osobennosti formirovaniya i razrusheniya vodoneftyanykh emul'siy na pozdney stadii razrabotki neftyanykh mestorozhdeniy (Features of formation and destruction of oil-water emulsions at a late stage of oil field development), Moscow: Publ. of OAO “VNIIOENG”, 2005, pp. 9–31.

11. Faroughi S.A., Huber C., Crowding-based rheological model for suspensions of rigid bimodal-sized particles with interfering size ratios, Physical Review, 2014, no. 5, DOI:10.1103/PhysRevE.90.052303

12. Ioannou K., Phase inversion phenomenon in horizontal dispersed oil/water pipeline flows: PhD Thesis, London: University College London, 2006.

13. Nädler M., Mewes D., Flow induced emulsification in the flow of two immiscible liquids in horizontal pipes, Int. J. Multiphase Flow, 1997, no. 23 (1), pp. 55–68.

14. Instruction Manual HAAKE Viscotester 550,  https://archive-resources.coleparmer.com/Manual_pdfs/98941-00,10.pdf

15. Kudinov V.I., Suchkov B.M., Intensifikatsiya dobychi vyazkoy nefti iz karbonatnykh kollektorov (Stimulation of viscous oil production from carbonate reservoirs), Samara: Samarskoe knizhnoe izdatel'stvo Publ., 1996, 440 p.

The object of the study is high-viscosity emulsions consisting of two immiscible liquids – oil and water. Factors affecting both the viscosity of such emulsions and the phase inversion point are considered. It was experimentally established that the phase inversion point is within the product water content from 50 to 80% and is characterized by the highest viscosity values of oil-water emulsions. However, under certain factors affecting the dispersion system, this range can increase to 85%. The influence of such parameters as water density, oil density, oil viscosity, mixing intensity, liquid shear rate, interfacial tension at the oil-water interface, acidity (pH) of the water phase on the rheological behavior of dispersed systems with respect to the displacement of the phase inversion point and the viscosity of oil-water emulsions is studied. The rheological dependences of the dynamic viscosity of oil-water emulsions on the above-mentioned factors were obtained. The factors that affect the phase inversion of dispersed systems and the value of the dynamic viscosity of oil-water emulsions are determined. The criteria for the influence of these factors on the displacement of the inversion point of the phases of the emulsions are revealed. An empirical equation is derived that takes into account the effect of the displacement of the phase inversion point as a function of the difference in the densities of oil and water. The main conclusions on the phase inversion offset are presented, which can be used to develop decision-making algorithms for predicting the phase inversion point and the dynamic viscosity of oil-water emulsions both during production and transportation, and during oil preparation.

References

1. Valiakhmetov R.I., Zdolnik S.E., Litvinenko K.V., A systematic approach to the choice of technologies for preventing complications in well oil production (In Russ.), Inzhenernaya praktika, 2016, no.4.

2. Medvedev V.F., Sbor i podgotovka neustoychivykh emul'siĭ na promyslakh (Gathering and preparation of unstable emulsions in the fields), Moscow: Nedra Publ., 1987, 144 p.

3.  Sakharov V.A., Mokhov M.A., Gidrodinamika gazozhidkostnykh smesey v vertikal'nykh trubakh i promyslovykh pod"emnikakh (Hydrodynamics of gas-liquid mixtures in vertical pipes and field hoists), Moscow: Publ. of Gubkin University, 2004, 398 p.

4. Ngan K.H., Phase Inversion in dispersed liquid-liquid pipe flow: PhD Thesis, Department of Chemical Engineering, University College London, 2010.

5. Matar O.K., Hewitt G.F., Ortiz E.S., Phase inversion in liquid-liquid dispersions, Department of Chemical Engineering, Imperial College, London.

6. Arirachakaran S., Oglesby K.D., Malinowsky M.S. et al., An analysis of oil/water flow phenomena in horizontal pipes, SPE-18836-MS, 1989, DOI: http://dx.doi.org/10.2118/18836-MS

7. Alboudwarej H., Shahraki A. et al., Rheology of heavy-oil emulsions,

SPE-97886-PA, 2007, DOI:10.2118/97886-PA

8. Wang W., W Cheng., Li K. et al., Flow patterns transition law of oil-water two-phase flow under a wide range of oil phase viscosity condition, Journal of Applied Mathematics, 2013, no. 8, pp. 1–8, DOI: http://dx.doi.org/10.1155/2013/291217.

9. Odozi U.A., Three-phase gas/liquid/liquid slug flow: PhD Thesis, Chem. Eng. Dept., Imperial College, London, UK, 2000.

10. Sakhabutdinov R.Z., Gubaydulin F.R., Ismagilov I.Kh., Kosmacheva T.F., Osobennosti formirovaniya i razrusheniya vodoneftyanykh emul'siy na pozdney stadii razrabotki neftyanykh mestorozhdeniy (Features of formation and destruction of oil-water emulsions at a late stage of oil field development), Moscow: Publ. of OAO “VNIIOENG”, 2005, pp. 9–31.

11. Faroughi S.A., Huber C., Crowding-based rheological model for suspensions of rigid bimodal-sized particles with interfering size ratios, Physical Review, 2014, no. 5, DOI:10.1103/PhysRevE.90.052303

12. Ioannou K., Phase inversion phenomenon in horizontal dispersed oil/water pipeline flows: PhD Thesis, London: University College London, 2006.

13. Nädler M., Mewes D., Flow induced emulsification in the flow of two immiscible liquids in horizontal pipes, Int. J. Multiphase Flow, 1997, no. 23 (1), pp. 55–68.

14. Instruction Manual HAAKE Viscotester 550,  https://archive-resources.coleparmer.com/Manual_pdfs/98941-00,10.pdf

15. Kudinov V.I., Suchkov B.M., Intensifikatsiya dobychi vyazkoy nefti iz karbonatnykh kollektorov (Stimulation of viscous oil production from carbonate reservoirs), Samara: Samarskoe knizhnoe izdatel'stvo Publ., 1996, 440 p.


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