Programs for energy efficiency and increased profitability of field production, implemented by oil companies, in modern market conditions lead to the wide distribution of dual completion technologies using borehole pumping units. Oil production by submersible units, including sucker-rod and electric centrifugal pumps, is one of the most common ways to develop objects with their considerable differentiation in operation performance and formation fluid properties. Features of the upper reservoir production by the pump unit in this dual completion scheme are associated with low productivity of the reservoir, due to the low mobility of reservoir oil in natural temperature-and-pressure conditions. In this regard, the research of possibility of heating bottom-hole zone of upper formation by lower formation’s thermal energy and heat, derived from sucker-rod and electric centrifugal pumps, is important today.
Mathematical model for calculation of thermal field in system well – reservoir – sucker-rod pump – electrical centrifugal pump, taking into account convective heat transfer, thermal conductivity, thermodynamic effects, and heat generation in electrical centrifugal and sucker-rod pumps, was obtained to evaluate the heat effect of the pumping unit. It is proved that in steady running there is a heating of the bottom-hole zone of upper formation due to the natural thermal energy of the reservoir fluid and the heat, generated by the electric centrifugal pump and a sucker-rod pump, in which the efficiency of heating is mainly determined by the flow rate of upper reservoir. A potential prospect of the implementation of the periodic pump down out of upper reservoir by sucker-rod pump, allowing to increase productivity of upper reservoir and oil recovery factor by effective warming up of upper reservoir, is shown.
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