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Improving technology of horizontal sidetracking in complicated geological-technical conditions

UDK: 622.24.085.2
DOI: 10.24887/0028-2448-2019-8-40-43
Key words: sidetracking, horizontal sidetrack, incompatibly drilling conditions, selection of candidate wells for sidetracking, risks of complications and accidents
Authors: D.L. Bakirov (KogalymNIPIneft Branch of LUKOIL-Engineering LLC in Tyumen, RF, Tyumen), G.V. Mazur (KogalymNIPIneft Branch of LUKOIL-Engineering LLC in Tyumen, RF, Tyumen), E.V. Babushkin (KogalymNIPIneft Branch of LUKOIL-Engineering LLC in Tyumen, RF, Tyumen), P.A. Bagaev (KogalymNIPIneft Branch of LUKOIL-Engineering LLC in Tyumen, RF, Tyumen), V.P. Ovchinnikov (Tyumen Industrial University, RF, Tyumen)

Sidetracking is one of the most effective technologies that allows increasing oil production while expanding reserves and increasing oil recovery fr om reservoirs, returning oil wells to operation. In the region wh ere LUKOIL-Western Siberia LLC operates, these fields include Vatieganskoye, which has been developed since 1985. The main problem with sidetracking in this field is the section of unstable clay-argillite rocks (Pokachev-Savoy rock unit), drilling-in at large zenith angles, as well as transit and target productive formations with abnormally low formation pressures. At present, a set of measures has been formed that allow preventing the occurrence of accidents and complications horizontal sidetracking in incompatible conditions, reducing unproductive time. The activities include: optimization of the candidate well selection process for the sidetracking; pre-design and research work to improve the design, formulation of drilling mud, wiring technology and completion of sidetracks; conducting pilot tests; construction and updating of geomechanical models.

The positive results of introducing an integrated approach for well reconstruction using sidetracking method in incompatible geological and technological conditions made it possible to construct sidetracks with multilateral horizontal completion, which ensured an increase in drainage area and well productivity. The current experience and technical and technological solutions were widely used in sidetracking operations and in production drilling in difficult conditions.

References

1. Fazylov D.A., Mazur G.V., Rezul'taty vnedreniya metodiki po kriteriyam slozhnosti profiley bokovykh stvolov s gorizontal'nym okonchaniem (The results of the implementation of the methodology according to the complexity criteria of sidetrack profiles with horizontal ending), Proceedings of XVIII Conference of young scientists and specialists of the Branch of LUKOIL-Engineering LLC, Tyumen', 2018, pp. 565–573.

2. Malyutin D.V., Bakirov D.L., Babushkin E.V., Svyatukhov D.S., Geomechanical modeling to solve the problem of wells construction in LLC "LUKOIL-Western Siberia" (on the example of Vategansky deposit) (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2016, no. 11, pp. 23–26.

3. Malyutin D.V., Bakirov D.L., Babushkin E.V., Svyatukhov D.S., The results of 1D geomechanical modeling application by LLC "LUKOIL-West Siberia" when drilling wells (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2017, no. 9, pp. 52–58.

4. Tikhonov E.V., Sokovnin S.A., Dolmatov A.P. et al., Drilling low pressure reservoirs in Western Siberia: BARADRIL-N®/Mineral oil, oil in water emulsion (In Russ.), Burenie i neft', 2013, no. 10, pp. 50-52.

5. Sokovnin S.A., Tikhonov E.V, Kharitonov A.B. et al., Best practices – Direct emulsion-based drilling solution as a new approach to drilling in mature fields with low reservoir pressure (In Russ.), SPE 176519-MS, 2015.

6. Bakirov D.L., Babushkin E.V., Fattakhov M.M., Malyutin D.V., Improving the efficiency of multilateral wells construction by the use of oil-based drilling fluids (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 8, pp. 28–30.

Sidetracking is one of the most effective technologies that allows increasing oil production while expanding reserves and increasing oil recovery fr om reservoirs, returning oil wells to operation. In the region wh ere LUKOIL-Western Siberia LLC operates, these fields include Vatieganskoye, which has been developed since 1985. The main problem with sidetracking in this field is the section of unstable clay-argillite rocks (Pokachev-Savoy rock unit), drilling-in at large zenith angles, as well as transit and target productive formations with abnormally low formation pressures. At present, a set of measures has been formed that allow preventing the occurrence of accidents and complications horizontal sidetracking in incompatible conditions, reducing unproductive time. The activities include: optimization of the candidate well selection process for the sidetracking; pre-design and research work to improve the design, formulation of drilling mud, wiring technology and completion of sidetracks; conducting pilot tests; construction and updating of geomechanical models.

The positive results of introducing an integrated approach for well reconstruction using sidetracking method in incompatible geological and technological conditions made it possible to construct sidetracks with multilateral horizontal completion, which ensured an increase in drainage area and well productivity. The current experience and technical and technological solutions were widely used in sidetracking operations and in production drilling in difficult conditions.

References

1. Fazylov D.A., Mazur G.V., Rezul'taty vnedreniya metodiki po kriteriyam slozhnosti profiley bokovykh stvolov s gorizontal'nym okonchaniem (The results of the implementation of the methodology according to the complexity criteria of sidetrack profiles with horizontal ending), Proceedings of XVIII Conference of young scientists and specialists of the Branch of LUKOIL-Engineering LLC, Tyumen', 2018, pp. 565–573.

2. Malyutin D.V., Bakirov D.L., Babushkin E.V., Svyatukhov D.S., Geomechanical modeling to solve the problem of wells construction in LLC "LUKOIL-Western Siberia" (on the example of Vategansky deposit) (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2016, no. 11, pp. 23–26.

3. Malyutin D.V., Bakirov D.L., Babushkin E.V., Svyatukhov D.S., The results of 1D geomechanical modeling application by LLC "LUKOIL-West Siberia" when drilling wells (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2017, no. 9, pp. 52–58.

4. Tikhonov E.V., Sokovnin S.A., Dolmatov A.P. et al., Drilling low pressure reservoirs in Western Siberia: BARADRIL-N®/Mineral oil, oil in water emulsion (In Russ.), Burenie i neft', 2013, no. 10, pp. 50-52.

5. Sokovnin S.A., Tikhonov E.V, Kharitonov A.B. et al., Best practices – Direct emulsion-based drilling solution as a new approach to drilling in mature fields with low reservoir pressure (In Russ.), SPE 176519-MS, 2015.

6. Bakirov D.L., Babushkin E.V., Fattakhov M.M., Malyutin D.V., Improving the efficiency of multilateral wells construction by the use of oil-based drilling fluids (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 8, pp. 28–30.



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