Abstract
The purpose of the present research paper is to estimate the energy efficiency of ESP-operated low production rate wells (up to 100 m3/d).The data on pumps energy efficiency, including the high-speed ESPs, were consolidated and analyzed. The bench test of high-speed ESPs and comparison with field tests allowed to determine the efficiency adjustment factors and establish functional dependencies of energy parameters on shaft rotation speed;theobtainedcorrelations were suggested for recalculation of nominalvalues in bench tests. The paper also indicates that the average efficiency for the high speed ESPs is 12-17% higher in absolute values and 40-68% higher in relative values, compared with the efficiency of pumps with a nominal rotation speed of 3000 rpm. The suggested approach can be expanded as a methodology for wells with more complex operational conditions and more complex pump systems.
Highlights
In today’s oil and gas production environment, enhancement of a company’s operations efficiency becomes extremely important
In the present paper we investigate methods of estimating energy efficiency of wells with low flow rate operated by Electric submersible pumps (ESPs)
Surface ESP equipment includes surface cable, high voltage junction box, step-up transformer, and surface operating unit. These elements are characterized by relatively low energy losses, with an efficiency of around 97%.Theefficiency of an ESP with the components connected to the same circuit depends on the value of each element and can be recorded as: ηESP=ηESP∙ηDHM∙ηC∙ηother ∙ηtb∙ηse.(1)
Summary
In today’s oil and gas production environment, enhancement of a company’s operations efficiency becomes extremely important. The total power consumption for lifting fluids for Russian oil companies is 55-62% of the total energy consumption, while for water injection it is 22-30%, and for oil and gas treatment and transportation it amounts to 8...23%. The remaining oil production processes are less energy-consuming [1]. Electric submersible pumps (ESPs) produce 75% of all oil in Russia and are installed in more than 60% of the Russian well stock. The ESP energy efficiency is a crucial factor.
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