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Influence of oil viscosity changing during the contact with water on the oil recovery factor

UDK: 622.276.344(18)
DOI: 10.24887/0028-2448-2019-5-78-81
Key words: recovery factor, Buckley - Leverett equation, oil viscosity, hydrodynamic modeling
Authors: A.S. Topolnikov (RN-BashNIPIneft LLC, RF, Ufa), D.S. Gulishov (Izhevsk Oil Research Center CJSC, RF, Izhevsk)

For many highly watered oilfields at late stages with reservoir pressure greater than the saturation pressure the measured gas-oil ratio is often considerably exceeds its origin value. During the interaction of oil and water in the reservoir the partial transition of light components occurs from oil to water and their carrying out to the surface dissolved in passing extracted water is done. Herewith the properties of the reservoir oil because of the change of component composition become different with time from its properties at the beginning of the field development. In the paper the estimation of influence of change of reservoir oil viscosity, which is caused by contacting with injected water, on the recovery factor is provided. On the base of Backley - Leverett equation the parametric analysis is provided of influence of type of water injection on the oil recovery factor for different parameters of reservoir and phase permeability. It is shown that the increase of oil viscosity caused by change of it component composition and physical and chemical properties during the contact with injected water leads to decrease of oil recovery factor down to 2% from the proposed value, when the variation of oil viscosity is neglected. By the example of one of the oilfields form Western Siberia, which is operated at late stage, the estimation of influence of change of reservoir oil viscosity on the recovery factor and accumulated oil production during remaining period of time is done. It is obtained that under conditions of change of reservoir oil viscosity on reaching the water cut up to 95% the proposed oil recovery factor will decrease by 6% and the proposed accumulated oil production will decrease by 10%. The obtained results indicate about importance of taking into account the change of oil viscosity during contact with water when planning the basic indicators of oil recovery.

References

1. Mikhaylov V.G., Ponomarev A.I., Topol'nikov A.S., Prediction of gas factor taking into account gas dissolved in the water at late stages development of oil fields (In Russ.), SOCAR Proceedings, 2017, no. 3, pp. 41–48.

2. Baymukhametov M.K., Gulishov D.S., Mikhaylov V.G. et al., Analiz prichin rosta gazovogo faktora na pozdnikh stadiyakh razrabotki neftyanykh mestorozhdeniy (In Russ.), Izvestiya Tomskogo politekhnicheskogo universiteta. Inzhiniring georesursov = Bulletin of the Tomsk Polytechnic University. Geo Assets, 2018, V. 329, no. 8, pp. 104–111.

3. Gul'tyaeva N.A., Toshchev E.N., Mass exchange in the oil-gas-water and its effect on the production of associated gas (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2013, no. 10, pp. 100–103.

4. Imashev R.N., Fedorov V.N., Zaripov A.M., On the gas factor change in the process of Arlanskoye field development (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 8, pp. 122–125.

5. Amerkhanov I.M., Reym G.A., Grebneva S.T., Kataeva M.R., Effect of injected water on oil-in-situ parameters (In Russ.), Neftepromyslovoe delo, 1976, no. 6, pp. 16–18.

6. Sheykh-Ali D.M., Nauchno-metodicheskie osnovy issledovaniya plastovykh neftey i prognozirovaniya izmeneniy ikh svoystv v protsesse razrabotki neftyanykh mestorozhdeniy (Scientific and methodological basis for the study of reservoir oils and prediction of changes in their properties in the process of developing oil fields): thesis of doctor of technical science, Ufa, 1997.

7. Basniev K.S., Kochina I.N., Maksimov V.M., Podzemnaya gidromekhanika (Underground fluid mechanics), Moscow: Nedra Publ., 1993, 416 p.

8. Kostrigin I.V., Zagurenko T.G., Khatmullin I.F., History of the creation and deploying of software package RN-KIN (In Russ.), Nauchno-tekhnicheskiy vestnik OAO “NK “Rosneft'”, 2014, no. , pp. 4–7.

9. Dake L.P., Fundamentals of reservoir engineering, Shell Internationale Petroleum Maatschappij B. V., The Hague, The Netherlands, 1998, 498 p.

For many highly watered oilfields at late stages with reservoir pressure greater than the saturation pressure the measured gas-oil ratio is often considerably exceeds its origin value. During the interaction of oil and water in the reservoir the partial transition of light components occurs from oil to water and their carrying out to the surface dissolved in passing extracted water is done. Herewith the properties of the reservoir oil because of the change of component composition become different with time from its properties at the beginning of the field development. In the paper the estimation of influence of change of reservoir oil viscosity, which is caused by contacting with injected water, on the recovery factor is provided. On the base of Backley - Leverett equation the parametric analysis is provided of influence of type of water injection on the oil recovery factor for different parameters of reservoir and phase permeability. It is shown that the increase of oil viscosity caused by change of it component composition and physical and chemical properties during the contact with injected water leads to decrease of oil recovery factor down to 2% from the proposed value, when the variation of oil viscosity is neglected. By the example of one of the oilfields form Western Siberia, which is operated at late stage, the estimation of influence of change of reservoir oil viscosity on the recovery factor and accumulated oil production during remaining period of time is done. It is obtained that under conditions of change of reservoir oil viscosity on reaching the water cut up to 95% the proposed oil recovery factor will decrease by 6% and the proposed accumulated oil production will decrease by 10%. The obtained results indicate about importance of taking into account the change of oil viscosity during contact with water when planning the basic indicators of oil recovery.

References

1. Mikhaylov V.G., Ponomarev A.I., Topol'nikov A.S., Prediction of gas factor taking into account gas dissolved in the water at late stages development of oil fields (In Russ.), SOCAR Proceedings, 2017, no. 3, pp. 41–48.

2. Baymukhametov M.K., Gulishov D.S., Mikhaylov V.G. et al., Analiz prichin rosta gazovogo faktora na pozdnikh stadiyakh razrabotki neftyanykh mestorozhdeniy (In Russ.), Izvestiya Tomskogo politekhnicheskogo universiteta. Inzhiniring georesursov = Bulletin of the Tomsk Polytechnic University. Geo Assets, 2018, V. 329, no. 8, pp. 104–111.

3. Gul'tyaeva N.A., Toshchev E.N., Mass exchange in the oil-gas-water and its effect on the production of associated gas (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2013, no. 10, pp. 100–103.

4. Imashev R.N., Fedorov V.N., Zaripov A.M., On the gas factor change in the process of Arlanskoye field development (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 8, pp. 122–125.

5. Amerkhanov I.M., Reym G.A., Grebneva S.T., Kataeva M.R., Effect of injected water on oil-in-situ parameters (In Russ.), Neftepromyslovoe delo, 1976, no. 6, pp. 16–18.

6. Sheykh-Ali D.M., Nauchno-metodicheskie osnovy issledovaniya plastovykh neftey i prognozirovaniya izmeneniy ikh svoystv v protsesse razrabotki neftyanykh mestorozhdeniy (Scientific and methodological basis for the study of reservoir oils and prediction of changes in their properties in the process of developing oil fields): thesis of doctor of technical science, Ufa, 1997.

7. Basniev K.S., Kochina I.N., Maksimov V.M., Podzemnaya gidromekhanika (Underground fluid mechanics), Moscow: Nedra Publ., 1993, 416 p.

8. Kostrigin I.V., Zagurenko T.G., Khatmullin I.F., History of the creation and deploying of software package RN-KIN (In Russ.), Nauchno-tekhnicheskiy vestnik OAO “NK “Rosneft'”, 2014, no. , pp. 4–7.

9. Dake L.P., Fundamentals of reservoir engineering, Shell Internationale Petroleum Maatschappij B. V., The Hague, The Netherlands, 1998, 498 p.



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