In the context of the reduction in oil production under the OPEC agreement and the decrease in the cost of oil on the world market, possibly for a long-term period, one of the main strategic tasks of the Russian oil and gas industry is to increase the profitability of operating the base well stock in brownfields by reducing of oil production cost. Decrease in oil production, increase in water cut in well production, decrease in reservoir pressure require an increase in the cost of electric energy for lifting fluid, oil gathering and processing, and injection of produced water. The energy costs of the brownfields can be up to 50–60 % of all OPEX for oil production. A promising direction for increasing profitability are low-cost measures aimed at decline volumes of produced water and reducing energy consumption with a simultaneous increase in additional oil production and residual recoverable reserves.
The article discusses the results of applying technologies to increase the efficiency of operating the base well stock using the example of PJSC Slavneft-Megionneftegaz. Slavneft-Megionneftegas PJSC has performed 2,364 well operations of leveling injection profile of wells using 27 different technologies under the principles of a systematic approach since 2006. At 338 injection well sites works on non-stationary waterflooding was carried out. The additional oil production after leveling injection profile’s well treatment is more than one thousand tons per well, the percentage of success of these works is about 90%.The cumulative additional oil production as of March 1, 2020 amounted to 2.7 mln tons, the decrease in produced water - 14.1 mln tons, unproductive injection of water decreased by 20.4 mln m3; the accumulated net income of the subsoil user exceeded 4.5 bln rubles.
According to VNIIneft, in the current conditions of OPEC oil production decline and low oil prices, the cost of additional oil production from the leveling injection profile’s well treatment is about $ 2.1–2.5 per barrel, which is about 2.7 times lower than the cost of basic production without this works.The proposed approaches have great relevance, high resistance to risk factors, cost-effective and have great potential for further replication in the Western Siberia’s fields and the whole of Russia with aim to ensure financial stability in a worsening macroeconomic conditions.
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