HEAT EXCHANGE DEVICE FOR SUBMERSIBLE ELECTRIC MOTORS OF ELECTRIC CENTRIFUGAL PUMP UNITS

• Main Authors: Roza I. Vakhitova, Kamil R. Urazakov, Elena B. Dumler
• Format: Article
• Language: Russian
• Published: Tomsk Polytechnic University 2021-04-01
• Series: Известия Томского политехнического университета: Инжиниринг георесурсов
• Subjects: electric centrifugal pumping unit; submersible electric motor; heat exchanger; heat exchange process; temperature gradient
• Online Access: http://izvestiya.tpu.ru/archive/article/view/3144/2441

The relevance of the device development is caused by the need to solve the problems related to the cooling of high-speed valve and asynchronous submersible motors. The development of efficient cooling systems for such engines when using high-speed engines in low-flow wells is especially urgent, since the power of heat sources increases sharply according to a quadratic law depending on the number of revolutions. The main aim of the research is to develop a design of a heat exchange device that allows intensifying heat exchange processes in a submersible electric motor to increase its overhaul period. Object: a heat exchanger module for reducing thermal stress in serially produced submersible equipment of electric submersible centrifugal pump installations with asynchronous submersible oil-filled motors and high-speed submersible installations with valve motors for their efficient operation at high temperatures. Methods. To solve the problem, the method of design study was used by modernizing the existing design of the heat exchanger with a low efficiency of heat transfer between the reservoir fluid and the heated oil of the electric motor with small temperature gradients between them. Results. The authors have proposed the improved design of the heat exchanger module, which allows providing the maximum degree of intensification of heat exchange processes in the small internal dimensions of the well and relatively low temperature gradients between the heated oil of the submersible electric motor and the formation fluid washing it. For effective cooling of the oil system of the electric motor, it is proposed to use a two-circuit cooling system. To increase the total surface area of ​​active heat transfer, ribbing of the internal channel of the through flow of formation fluid is made. To ensure active circulation of heated oil, it is proposed to install flow swirling elements on the surface of the inner walls of the oil channels, which allows equalizing the temperature indicators of the formation fluid and oil.