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Specific PLT features in complex conditions of East Siberia to assist reservoir management

UDK: 622.276.1/.4
DOI: 10.24887/0028-2448-2020-11-56-61
Key words: multilateral wells, field-geophysical survey, thin oil rims, under-gas-cap zones
Authors: V.A. Grinchenko (Taas-Yuriakh Neftegazodobycha LLC, RF, Lensk), R.R. Valeev (Taas-Yuriakh Neftegazodobycha LLC, RF, Lensk), M.M. Abdullin (Rosneft Oil Company, RF, Moscow), I.V. Schekotov (Taas-Yuriakh Neftegazodobycha LLC, RF, Lensk), A.V. Kopylov (Taas-Yuriakh Neftegazodobycha LLC, RF, Lensk), A.V. Sviaschenko (Taas-Yuriakh Neftegazodobycha LLC, RF, Lensk), S.A. Yaschenko (Tyumen Petroleum Research Center LLC, RF, Tyumen), A.V. Kobyashev (Tyumen Petroleum Research Center LLC, RF, Tyumen), A.I. Komyagin (Tyumen Petroleum Research Center LLC, RF, Tyumen), A.V. Mandrugin (Tyumen Petroleum Research Center LLC, RF, Tyumen), V.F. Istisheva (Tyumen Petroleum Research Center LLC, RF, Tyumen)

The paper considers at the process of control and studies in the wells of the Srednebotuobinskoye field of Rosneft Oil Company, and describes the results of PLT performed in the course of pilot operations in multilateral wells with autonomous inflow control devices. Main pay interval Bt (75%) is in under-gas zone in a small oil rim of ten meters in thickness. A conventional approach to developing contact reserves is by horizontal wells with a drawdown applied to the reservoir. According to the strategy of Rosneft Oil Company, the share of highly productive horizontal wells shall be at least 40% of the well stock. Use of horizontal wells as the base case technology helped significantly increase the efficiency of developing the field. The initial productivity index of horizontal wells (design horizontal length of 1250 m) on the average came to 100 m3/(day⋅MPa). Going forward, the improvement in development technologies for gas/oil/water zone of the field is achieved through multilateral wells (the total length of the main borehole inside the pay interval is 1250m + seven lateral holes of 500m each). The initial productivity index increased on the average to 500 m3/(day⋅MPa). Complex design wells required high precision control systems. The wells were equipped with continuous pressure monitoring gauges, which helped quantify the productivity of multilateral wells and obtain monitoring data on reservoir energy. Production logging tests conveyed by downhole tractor and CT, as well as Y-tool-based clean-up, allowed testing the entire cased section of the main borehole, identifying the working intervals in horizontal sections, and obtaining a qualitative assessment of sidetrack and autonomous inflow control device (AICD) efficiency. Use of PLT for inflow control in a horizontal section helped prove the efficiency of multilateral wells. Dependency of productivity on the effective length of a horizontal section is obtained. The results provide grounds for scaling up the pilot studies.

References

1. Levanov A.N., Belyanskiy V.Yu., Anur'ev D.A. et al., Concept baseline for the development of a major complex field in Eastern Siberia using flow simulation (In Russ.), SPE-176636-RU, 2015.

2. Ivanov E.N., Akinin D.V., Valeev R.R. et al., Development of reservoir with gas cap and underlying water on Srednebotuobinskoye field  (In Russ.), SPE-182055-RU, 2016.

3. Levanov A., Kobyashev A., Chuprov A. et al., Evolution of approaches to oil rims development in terrigenous formations of Eastern Siberia (In Russ.),

SPE-187772-RU, 2017.

4. Kontorovich A.A., Podschet zapasov nefti, gaza i kondensata Srednebotuobinskogo neftegazokondensatnogo mestorozhdeniya v predelakh Tsentral'nogo bloka i Kurungskogo litsenzionnogo uchastka (Calculation of oil, gas and condensate reserves of the Srednebotuobinskoye oil and gas condensate field within the Central Block and the Kurungsky license area), Krasnoyarsk:  Publ. of OOO «Geologiya Vostochnoy Sibiri», 2012.

5. Luk'yantseva E.A., Oparin I.A., Kobyashev A.V., Opredelenie metodov vyyavleniya sloya vysokovyazkikh neftey na primere Srednebotuobinskogo neftegazokondensatnogo mestorozhdeniya (Determination of methods for detection of a layer of high-viscosity oils on the example of the Srednebotuobinskoe oil and gas condensate field), Proceedings of conference GeoBaykal’ 2018, EAGE, 2018.

6. Prokop'eva E.G., Kobyashev A.V., Valeev R.R., Experience in production well logging and interpretation for horizontal wells of the Middle Botuobinskoe field (In Russ.), Karotazhnik, 2017, no. 8, pp. 19–33.

7. Grinchenko V.A., Makhmutov D.Z., Bliznyukov V.Yu. et al., Efficiency of drilling and completion of directional oil-producing wells in the Eastern Siberia through a horizontal section evolution - From single wellbores to the "Birch-Leaf" design due to detailing of hydrocarbon deposits geological structure (In Russ.), Stroitel'stvo neftyanykh i gazovykh skvazhin na sushe i na more, 2020, no. 5 (329), pp. 8–15.

The paper considers at the process of control and studies in the wells of the Srednebotuobinskoye field of Rosneft Oil Company, and describes the results of PLT performed in the course of pilot operations in multilateral wells with autonomous inflow control devices. Main pay interval Bt (75%) is in under-gas zone in a small oil rim of ten meters in thickness. A conventional approach to developing contact reserves is by horizontal wells with a drawdown applied to the reservoir. According to the strategy of Rosneft Oil Company, the share of highly productive horizontal wells shall be at least 40% of the well stock. Use of horizontal wells as the base case technology helped significantly increase the efficiency of developing the field. The initial productivity index of horizontal wells (design horizontal length of 1250 m) on the average came to 100 m3/(day⋅MPa). Going forward, the improvement in development technologies for gas/oil/water zone of the field is achieved through multilateral wells (the total length of the main borehole inside the pay interval is 1250m + seven lateral holes of 500m each). The initial productivity index increased on the average to 500 m3/(day⋅MPa). Complex design wells required high precision control systems. The wells were equipped with continuous pressure monitoring gauges, which helped quantify the productivity of multilateral wells and obtain monitoring data on reservoir energy. Production logging tests conveyed by downhole tractor and CT, as well as Y-tool-based clean-up, allowed testing the entire cased section of the main borehole, identifying the working intervals in horizontal sections, and obtaining a qualitative assessment of sidetrack and autonomous inflow control device (AICD) efficiency. Use of PLT for inflow control in a horizontal section helped prove the efficiency of multilateral wells. Dependency of productivity on the effective length of a horizontal section is obtained. The results provide grounds for scaling up the pilot studies.

References

1. Levanov A.N., Belyanskiy V.Yu., Anur'ev D.A. et al., Concept baseline for the development of a major complex field in Eastern Siberia using flow simulation (In Russ.), SPE-176636-RU, 2015.

2. Ivanov E.N., Akinin D.V., Valeev R.R. et al., Development of reservoir with gas cap and underlying water on Srednebotuobinskoye field  (In Russ.), SPE-182055-RU, 2016.

3. Levanov A., Kobyashev A., Chuprov A. et al., Evolution of approaches to oil rims development in terrigenous formations of Eastern Siberia (In Russ.),

SPE-187772-RU, 2017.

4. Kontorovich A.A., Podschet zapasov nefti, gaza i kondensata Srednebotuobinskogo neftegazokondensatnogo mestorozhdeniya v predelakh Tsentral'nogo bloka i Kurungskogo litsenzionnogo uchastka (Calculation of oil, gas and condensate reserves of the Srednebotuobinskoye oil and gas condensate field within the Central Block and the Kurungsky license area), Krasnoyarsk:  Publ. of OOO «Geologiya Vostochnoy Sibiri», 2012.

5. Luk'yantseva E.A., Oparin I.A., Kobyashev A.V., Opredelenie metodov vyyavleniya sloya vysokovyazkikh neftey na primere Srednebotuobinskogo neftegazokondensatnogo mestorozhdeniya (Determination of methods for detection of a layer of high-viscosity oils on the example of the Srednebotuobinskoe oil and gas condensate field), Proceedings of conference GeoBaykal’ 2018, EAGE, 2018.

6. Prokop'eva E.G., Kobyashev A.V., Valeev R.R., Experience in production well logging and interpretation for horizontal wells of the Middle Botuobinskoe field (In Russ.), Karotazhnik, 2017, no. 8, pp. 19–33.

7. Grinchenko V.A., Makhmutov D.Z., Bliznyukov V.Yu. et al., Efficiency of drilling and completion of directional oil-producing wells in the Eastern Siberia through a horizontal section evolution - From single wellbores to the "Birch-Leaf" design due to detailing of hydrocarbon deposits geological structure (In Russ.), Stroitel'stvo neftyanykh i gazovykh skvazhin na sushe i na more, 2020, no. 5 (329), pp. 8–15.



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