Effect of Fluid Viscosity on the Performance of the Pump ESP7A-1000

About the authors:

Sergey N. Peshcherenko, Dr. Sci. (Phys.-Math.), Professor, Department Physical and Technological Problems of Oil Production, Perm National Research Polytechnic University; Chief Researcher, Novomet-Perm; peshcherenko@yandex.ru

Dmitriy N. Lebedev, Research Engineer, Department of Innovation Development, Novomet-Perm; lebedev.dn@novomet.ru

Danil A. Pavlov, Master Student, Perm National Research Polytechnic University; Mathematician, Novomet-Perm; pavlov.da@novomet.ru

Abstract:

Currently, the production of viscous oil from marine high rate wells is carried out using serial centrifugal pumps. Their selection is performed individually by modeling well conditions in test benches. This approach is resource-intensive, it requires developing common principles for accounting the influence of well conditions on the characteristics of pumps.

For this purpose, the authors performed bench tests of the stage ESP7A-1000E on oil of ITD 680 (Newtonian liquid) and water + oil emulsion of ITD 680 (non-Newtonian liquid) in the frequency range of 3,000-6,000 rpm.

It is established that with increasing the speed of rotation, the head and efficiency of the stage increase monotonically throughout the entire range of viscosities studied.

The power consumed by the stage in dependence of flowrate does not change monotonously: at small flowrates (up to 300-800 m³/day) the power decreases with increasing viscosity, at large flowrates it increases. This is because, firstly, the lifting force in the hydraulic bearing increases, which means that friction decreases; and secondly, leakage decreases. The effect reduced with increasing shaft speed.

The heating of the liquid along the length of the pump is measured and calculated. It is established that the experimental data and the results of the calculation coincide if two mechanisms of liquid heating are taken into account because of the dissipation of mechanical energy in the pump stages and its adiabatic compression. It is shown that heating leads to a change in pump performance by 1.5-3.5% when a Newton liquid with a viscosity of 340 cP is applied to the pump inlet.

When the pump is operated on an emulsion (non-Newtonian liquid), both the heating of the liquid and the change in its rheology take place. The effect on the performance of the pump was significantly higher: the head of the stage increased by about 1.5 times, the power consumption decreased by 20%. A method is proposed for measuring the effective viscosity of an emulsion from the results of a pump test.

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