Multilateral wells application in continental facies of Vostochno-Messoyakhskoye field

UDK: 622.276.1/.4
DOI: 10.24887/0028-2448-2017-12-49-51
Key words: multilateral well, drilling, hard-to-recover reserves, fishbone
Authors: D.A. Sugaipov, I.F. Rustamov (Gazprom Neft PJSC, RF, Saint-Petersburg), O.S. Ushmaev (Gazpromneft-Razvitie LLC, RF, Saint-Petersburg), E.V. Zagrebelnyi, D.M. Eremeev (Messoyakhaneftegas JSC, RF, Tyumen)

Vostochno-Messoyakhskoye field is a multi-layer reservoir fr om geological viewpoint. Main target – continental genesis pokurskaya formation – is characterized by heterogeneity high level. Significant part of reserves (over 50%) is located in delta facies, which is the discrete part of section. The most common way to develop discontinuous reservoir – horizontal wells with multifrac – was not realized because of 2 reasons: high risk of fracturing beyond the borders of oil-saturated zone; mechanical singularity of pokurskaya formation.

Multilateral wells wh ere approached to develop discontinuous reservoir. Two types of MLL were subdivided: two lateral cased horizontal parts with comparable length (TAML-2); one cased horizontal part with several uncased parts, which are much shorter than the main part (fishbone). For over 9 months of MLL wells performance with PLT running follow points were concluded: MLL wells productivity is higher than horizontal wells in the same geological conditions up to 60%; MLL wells decline is 25% higher than horizontal one, the most valuable reason – finishing of production in uncased parts.

Current estimation of NPV increase for MLL wells in compare with horizontal is up to 45%. Positive dynamic in well construction date and cost allows to increase number of lateral parts and reach the whole cased fishbone type wells, with keeping the economic efficiency level and increasing the production level of wells.


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