Efficiency of electric centrifugal pumps application for oil production from wells of pre-Jurassic formations
Key words: pump, saline deposits, igneous rock, temperature
Authors: A.A. Makeev (Oil and Gas Production Department Bystrinskneft, Surgutneftegas PJSC, RF, Surgut), D.V. Shelokov (Oil and Gas Production Department Bystrinskneft, Surgutneftegas PJSC, RF, Surgut), E.L. Shay (Oil and Gas Production Department Bystrinskneft, Surgutneftegas PJSC, RF, Surgut), M.V. Chirkov (Oil and Gas Production Department Bystrinskneft, Surgutneftegas PJSC, RF, Surgut)
The article discusses the period of formation of the Triassic deposits. An example of the formation of pre-Jurassic deposits in Western Siberia is the Krasnoleninsky arch, formed during the period of volcanic activity. The revealed productivity of the Triassic sediments determined further prospects for the development of hydrocarbon reserves in the fields of the Krasnoleninsky arch. Deposits of pre-Jurassic strata are represented mainly by volcanic formations with interlayers of terrigenous rocks, characterized by significant changes in reservoir properties over the area and section. When operating wells drilled on Triassic sediments using electric centrifugal pump installations, special approach is necessary to the selection of equipment, taking into account the variety of complicating factors and the peculiarities of the geological structure of the reservoirs. The complicating factors in the fields of the Krasnoleninsky arch include the following: 1) high temperature of the formation fluid; 2) a significant amount of free gas contained in the well product at the pump intake; 3) a significant change in the production characteristics of wells after geological and technical measures. The abovementioned complicates the choice of equipment for oil production and reduces its reliability. Mineralogical studies have shown that the deposits mainly contain corrosion products with inclusions of calcite. Under high-temperature conditions, the period of growth of calcite crystals is significant. Calcite crystals in the form of mechanical impurities enter the pump. To reduce the negative effect of solid calcite formations in the pump, it is proposed to use a complete inlet filter with a bypass valve and a gas dispergation module. This configuration made it possible to protect the pump working channels from solid calcite deposits formed at the bottomhole.
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