The Verkhnechonskneftegaz company (part of Rosneft) has begun full-scale development of the Preobrazhensky horizon at the Verkhnechonskoye oil and gas condensate field. Additional production at the field will amount to 4 million tons of oil due to the drilling and reconstruction of more than 200 wells.
The Company’s specialists have selected the most effective technology for well construction – drilling with horizontal penetration through a productive formation of at least 1000 meters and subsequent nine-stage hydraulic fracturing (HF). A total of 10 such wells were put into operation, the flow rate of which for low-permeability formations was at a consistently high level – an average of 49 tons of oil per day. The design of complex hydraulic fracturing is modeled using Rosneft’s own software – the unique digital complex RN-GRID, which has significant technical superiority over foreign analogues at a lower cost.
The Preobrazhensky horizon is located at a depth of 1600 meters, above the Verkhnechonsky horizon, which is the main development object of Verkhnechonskneftegaz. It is represented by a carbonate reservoir and is characterized by extremely low permeability of the formation. Initial recoverable reserves amount to more than 28 million tons of oil. The oil-bearing area of the Preobrazhensky horizon extends far beyond the Verkhnechonskoye field to the territory of several license areas in the Irkutsk region.
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