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%.

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