Nodal analysis indentifies ESP wellhead choke problems

Based on a presentation to the 57th Southwestern Petroleum Short Course, Lubbock, Tex., Apr. 26-29, 2010.As shown with a nodal analysis, the use of wellhead chokes on electrical submersible-pumped wells causes high hydraulic losses across the chokes and wastes considerable energy.The analysis studied over-designed installations with negligible free gas production.This article describes a proposed calculation model for determining the head required to produce well fluids to the separator and the liquid rate in the production system.Artificial liftThe objective of artificial lift design is to determine a lift system with a liquid-producing capacity that matches the inflow rate to an oil wel...

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