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Improving the efficiency of multilateral wells construction by the use of oil-based drilling fluids

UDK: УДК 622.244.45
Key words: abnormally low formation pressure, differential sticking, non-productive time, low-permeability reservoir, multilateral well, oil-based drilling fluid
Authors: D.L. Bakirov, E.V. Babushkin, M.M. Fattakhov, D.V. Malyutin (KogalymNIPIneft Branch LUKOIL-Engineering LLC in Tyumen, RF, Tyumen)

Productive formations with low poroperm properties and often abnormally low formation pressure are the main drilling targets in Western Siberia now. The use of water-based drilling fluids at the completing in such conditions leads to complications and accidents. Alternatively, at multilateral wells drilling with great reservoir driving it is proposed the use of oil-based drilling fluids. Laboratory tests on the cores confirmed that oil-based drilling fluids have a minimum filtration and the highest rates of permeability recovery. This makes it possible to preserve poroperm properties of low-permeability reservoir and contributes to increasing the efficiency of the productive formation development. Industrial experimental works are carried out in the fields of LUKOIL-West Siberia LLC. The results of oil-based drilling fluids application for horizontal multilateral wells completing show the effectiveness of the given technology. The complications, associated with the drilling fluid, are excluded, penetration rate increases to 30%, non-productive time reduces when oil-based drilling fluids are used in conditions of a stratum with abnormally low formation pressure at reservoir driving up to 1200 m. The initial oil production rate has exceeded 20% the same index of the well, drilled with a water-based drilling fluid in similar geological and technical conditions. Oil-based drilling fluids reusing has allowed to reduce the cost of materials by 20%.

References

1. Bakirov D.L., Babushkin E.V., Fattakhov M.M., Malyutin D.V., Use of drilling

mud of decreased density to enhance the quality of opening of productive

formations with abnormally low formation pressure (In Russ.), Geologiya, geofizika

i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2014, no. 10,

pp. 39–42.

2. Bakirov D.L., Fattakhov M.M., Bondarenko L.S. et al., Technology implementation

efficiency of construction of multilateral wells with horizontal ending

at the fields of "LUKOIL-the Western Siberia, Ltd." (In Russ.), Geologiya, geofizika

i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2014, no. 10,

pp. 42–45.

3. Bakirov D.L., Fattakhov M.M., Malyutin D.V., Babushkin E.V., Some aspects

relating to completion of hor izontal wells with open well bottoms in terrigene

collectors of the Western Siberia (In Russ.), Geologiya, geofizika i razrabotka

neftyanykh i gazovykh mestorozhdeniy, 2015, no. 9, pp. 56–63.

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. Kudrin A.A., Arslanbekov A.R., Solov'ev S.G. et al., Influence of drilling fluids

type on reservoir BU8-9 drill in of Yurkharovskoe field (In Russ.), Burenie i neft',

2009, no. 7–8, pp. 42-47.

6. Arslanbekov A.R., Lutfullin A.A., Medentsev A.V. et al., Drilling in oil-wet reservoirs

with oil based mud systems (In Russ.), Burenie i neft', 2014, no. 9,

pp. 29–32.

7. Andriadi S., Dontsov E., Sergeev S., Sibagatullin R., The use of oil-based solution

for penetration of the Jurassic deposits on Van Egan field (In Russ.), Novator,

2012, no. 6, pp. 24–28.

Productive formations with low poroperm properties and often abnormally low formation pressure are the main drilling targets in Western Siberia now. The use of water-based drilling fluids at the completing in such conditions leads to complications and accidents. Alternatively, at multilateral wells drilling with great reservoir driving it is proposed the use of oil-based drilling fluids. Laboratory tests on the cores confirmed that oil-based drilling fluids have a minimum filtration and the highest rates of permeability recovery. This makes it possible to preserve poroperm properties of low-permeability reservoir and contributes to increasing the efficiency of the productive formation development. Industrial experimental works are carried out in the fields of LUKOIL-West Siberia LLC. The results of oil-based drilling fluids application for horizontal multilateral wells completing show the effectiveness of the given technology. The complications, associated with the drilling fluid, are excluded, penetration rate increases to 30%, non-productive time reduces when oil-based drilling fluids are used in conditions of a stratum with abnormally low formation pressure at reservoir driving up to 1200 m. The initial oil production rate has exceeded 20% the same index of the well, drilled with a water-based drilling fluid in similar geological and technical conditions. Oil-based drilling fluids reusing has allowed to reduce the cost of materials by 20%.

References

1. Bakirov D.L., Babushkin E.V., Fattakhov M.M., Malyutin D.V., Use of drilling

mud of decreased density to enhance the quality of opening of productive

formations with abnormally low formation pressure (In Russ.), Geologiya, geofizika

i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2014, no. 10,

pp. 39–42.

2. Bakirov D.L., Fattakhov M.M., Bondarenko L.S. et al., Technology implementation

efficiency of construction of multilateral wells with horizontal ending

at the fields of "LUKOIL-the Western Siberia, Ltd." (In Russ.), Geologiya, geofizika

i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2014, no. 10,

pp. 42–45.

3. Bakirov D.L., Fattakhov M.M., Malyutin D.V., Babushkin E.V., Some aspects

relating to completion of hor izontal wells with open well bottoms in terrigene

collectors of the Western Siberia (In Russ.), Geologiya, geofizika i razrabotka

neftyanykh i gazovykh mestorozhdeniy, 2015, no. 9, pp. 56–63.

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. Kudrin A.A., Arslanbekov A.R., Solov'ev S.G. et al., Influence of drilling fluids

type on reservoir BU8-9 drill in of Yurkharovskoe field (In Russ.), Burenie i neft',

2009, no. 7–8, pp. 42-47.

6. Arslanbekov A.R., Lutfullin A.A., Medentsev A.V. et al., Drilling in oil-wet reservoirs

with oil based mud systems (In Russ.), Burenie i neft', 2014, no. 9,

pp. 29–32.

7. Andriadi S., Dontsov E., Sergeev S., Sibagatullin R., The use of oil-based solution

for penetration of the Jurassic deposits on Van Egan field (In Russ.), Novator,

2012, no. 6, pp. 24–28.



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