«Oilfield engineering»

Selection and practical application of initial flow rate calculation methods for designed horizontal and multilateral wells with horizontal branches of AB13 formation in the Western Siberian fields

UDC: 622.276.346
DOI: -

Authors:

¹ LUKOIL-Engineering, Tyumen, Russia

Keywords: multilateral horizontal wells, heterogeneity of filtration-capacitive properties, permeability, depression, wells flow rate, water-flooding

Annotation:

Currently, the majority of highly productive, proven oil reserves of the AB group of fields in the Western Siberian region have been under development for over 45 years. A significant portion of these reserves is concentrated in reservoirs the drainage of which is complicated by geological characteristics deterioration.

Initial recoverable oil reserves indicators reflect a production decline because of water-flooding increase, significant recovery of oil reserves with washed-out zones increase and the growth of non-operational reserves.

Development of AB₁³ formation is complicated by heterogeneity both by the territory and cross-section, while the presence of an underlying highly permeable aquifer across the entire formation territory leads to rapid production wells water-flooding and rapid declining of oil flow rates.

Currently, the most effective method for developing the АВ₁³ formation’s reserves is the use of horizontal wells and multilateral horizontal wells with three and five branches. Extensive experience of using multilateral horizontal wells in the facies-variable regional АВ₁³ formation has allowed analyzing the potential of this method.

Since the beginning of horizontal well use and up to this day, the problem of estimating the design flow rates of horizontal wells has remained a pressing issue caused by the insufficient accuracy of flow rate forecasts using analytical formulas.

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