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Design of technologies for processing bottom-hole zone of Varadero oilfield (Cuba)

UDK: 622.276.6
DOI: 10.24887/0028-2448-2017-12-126-130
Key words: processing bottom-hole zone, compatibility with oil, acid compositions, methods of thermal processing of the reservoir, water-oil emulsion, viscosity, demulsifies, hydrocarbon solvent
Authors: V.N. Gusakov, L.E. Kashtanova, S.V. Nazarova, E.S. Tyugaeva, G.Z. Kalimullina, A.I. Voloshin (RN-UfaNIPIneft LLC, RF, Ufa)

The analysis of the reasons for the decrease in the productivity of producing wells of Varadero oilfield was performed. It is established that the formation of deposits of asphaltenes in the bottom-hole formation zone and formation of highly viscous water-in-oil emulsions are the main reasons for the lower permeability of oil-saturated matrix of carbonate rocks. At temperature 65°C (reservoir temperature) Varadero oilfield oil has a viscosity more than 0,600 Pa·s. It is established that at temperature below 40 °C the oil is pseudoplasticity liquid and is well described by the rheological equation of Herschel – Bulkley. From the temperature dependence of the effective viscosity of the oil determined the optimal conditions for the application of thermal methods of enhanced recovery, with increasing temperature of the reservoir up to 80 -135 °C, the viscosity is reduced to 2-27 times.

The viscosity of water-oil emulsion at the reservoir temperature and water content more than 50% increases to 14 PA·s, the beginning of a sharp increase in viscosity is observed when the water content is more than 35%. Petroleum solvents and demulsifies introduced into an emulsion reduce its viscosity 20-50 times and are offered for treatment of producing wells in a continuous dispensing into the well and squeeze treatment into the reservoir. It is shown that the acid compositions on the basis of 12% HCl are compatible with oil and do not make a risk of formation of emulsions and precipitation of secondary collateralize formation.

The obtained information is used to develop optimal technologies of processing of bottom-hole zones of producing wells to increase the efficiency of heavy oil production.

References

1. Rivera G.L., Perez O., The southeastern part of the Gulf of Mexico: A new petroleum province of the 21st century, WPC-32127, 2002

2. Smith G.E., Hurlburt G., Li V.P., Heavy oil carbonate: Primary production in Cuba, SPE 79002, 2002.

3. Jose A.-C., Socorro R., Lopetz S. et al., Integrate methods used for exploration evaluation in North Cuban Thrust Belt. Case: Northern heavy oil trend, AAPG International Conference, 2004.

4. URL: https://www.rosneft.ru/press/releases/item/185125/.

5. Van Dornelen MS., Ford W.G.F., Chiu T.J., An expert system for matrix acidizing treatment design, SPE 24779, 1992.

6. Kharisov R.Ya., Folomeev A.E., Bulgakova G.T., Telin A.G. The complex approach to the choice of the optimum acid composition for well stimulation in carbonate (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2011, no. 2, pp. 78–82.

7. Glushchenko V.N., Ptashko O.A., Kharisov R.Ya., Kislotnye obrabotki: sostavy, mekhanizm reaktsiy, dizayn (Acid treatment: the compositions, reaction mechanisms, design), Ufa: GILEM Publ., 2010, 392 p.

8. Gharbi K., Benyounes K., Khodja M., Removal and prevention of asphaltene deposition during oil production: A literature review, J. Pet. Sci. and Eng.,В  2017, V. 158, no. 11, pp. 351–360.

9. Khalimov R.Kh., Smykov V.V., Farkhullin R.G. et al., Removal of asphaltene-resin-paraffin deposits from the bottomhole formation zone using theВ  organic solvents is a promising way to restore the productivity of marginal well stock (In Russ.), Interval, 2004, no. 6, pp. 4–8

10. Telin A.G., Voloshin A.I., Ragulin V.V., Kalimullina G.Z., Effect of de-impulsive additives on the structural-rheological properties of oil shcha Yuzhno-Suhokumsk oil and gas production department (In Russ.), Nauchno-tekhnicheskiy Vestnik OAO “NK “Rosneft'”, 2007, no. 1, pp. 45–48

11. Voloshin A.I., Ragulin V.V., Telin A.G., Development and introduction of heavy organic compound deposition diagnostics, prevention and removing, SPE-93128, 2005.

The analysis of the reasons for the decrease in the productivity of producing wells of Varadero oilfield was performed. It is established that the formation of deposits of asphaltenes in the bottom-hole formation zone and formation of highly viscous water-in-oil emulsions are the main reasons for the lower permeability of oil-saturated matrix of carbonate rocks. At temperature 65°C (reservoir temperature) Varadero oilfield oil has a viscosity more than 0,600 Pa·s. It is established that at temperature below 40 °C the oil is pseudoplasticity liquid and is well described by the rheological equation of Herschel – Bulkley. From the temperature dependence of the effective viscosity of the oil determined the optimal conditions for the application of thermal methods of enhanced recovery, with increasing temperature of the reservoir up to 80 -135 °C, the viscosity is reduced to 2-27 times.

The viscosity of water-oil emulsion at the reservoir temperature and water content more than 50% increases to 14 PA·s, the beginning of a sharp increase in viscosity is observed when the water content is more than 35%. Petroleum solvents and demulsifies introduced into an emulsion reduce its viscosity 20-50 times and are offered for treatment of producing wells in a continuous dispensing into the well and squeeze treatment into the reservoir. It is shown that the acid compositions on the basis of 12% HCl are compatible with oil and do not make a risk of formation of emulsions and precipitation of secondary collateralize formation.

The obtained information is used to develop optimal technologies of processing of bottom-hole zones of producing wells to increase the efficiency of heavy oil production.

References

1. Rivera G.L., Perez O., The southeastern part of the Gulf of Mexico: A new petroleum province of the 21st century, WPC-32127, 2002

2. Smith G.E., Hurlburt G., Li V.P., Heavy oil carbonate: Primary production in Cuba, SPE 79002, 2002.

3. Jose A.-C., Socorro R., Lopetz S. et al., Integrate methods used for exploration evaluation in North Cuban Thrust Belt. Case: Northern heavy oil trend, AAPG International Conference, 2004.

4. URL: https://www.rosneft.ru/press/releases/item/185125/.

5. Van Dornelen MS., Ford W.G.F., Chiu T.J., An expert system for matrix acidizing treatment design, SPE 24779, 1992.

6. Kharisov R.Ya., Folomeev A.E., Bulgakova G.T., Telin A.G. The complex approach to the choice of the optimum acid composition for well stimulation in carbonate (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2011, no. 2, pp. 78–82.

7. Glushchenko V.N., Ptashko O.A., Kharisov R.Ya., Kislotnye obrabotki: sostavy, mekhanizm reaktsiy, dizayn (Acid treatment: the compositions, reaction mechanisms, design), Ufa: GILEM Publ., 2010, 392 p.

8. Gharbi K., Benyounes K., Khodja M., Removal and prevention of asphaltene deposition during oil production: A literature review, J. Pet. Sci. and Eng.,В  2017, V. 158, no. 11, pp. 351–360.

9. Khalimov R.Kh., Smykov V.V., Farkhullin R.G. et al., Removal of asphaltene-resin-paraffin deposits from the bottomhole formation zone using theВ  organic solvents is a promising way to restore the productivity of marginal well stock (In Russ.), Interval, 2004, no. 6, pp. 4–8

10. Telin A.G., Voloshin A.I., Ragulin V.V., Kalimullina G.Z., Effect of de-impulsive additives on the structural-rheological properties of oil shcha Yuzhno-Suhokumsk oil and gas production department (In Russ.), Nauchno-tekhnicheskiy Vestnik OAO “NK “Rosneft'”, 2007, no. 1, pp. 45–48

11. Voloshin A.I., Ragulin V.V., Telin A.G., Development and introduction of heavy organic compound deposition diagnostics, prevention and removing, SPE-93128, 2005.


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