Experiments and Emulsion Rheology Modeling in an Electric Submersible Pump
- Hattan Banjar (Saudi Aramco) | Hong-Quan Zhang (The University of Tulsa)
- Document ID
- International Petroleum Technology Conference
- International Petroleum Technology Conference, 26-28 March, Beijing, China
- Publication Date
- Document Type
- Conference Paper
- 2019. International Petroleum Technology Conference
- 3 Production and Well Operations, 3.1 Artificial Lift Systems, 3.1.2 Electric Submersible Pumps
- Pump, Rheology, Submersible, Emulsion, Electric
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An Electric Submersible Pump (ESP) is studied experimentally with oil-water emulsion. Emulsion rheology inside the ESP is also studied and modeled at different oil and water fractions, ESP rotational speeds and temperatures, using a dimensional analysis on a set of parameters contributing to the emulsion rheology. Density and mass flowrate are measured using the mass flowmeter, while the emulsion effective viscosity is initially derived from the pipe viscometer (PV) installed downstream of the ESP. Effective viscosity values at the stage condition are corrected using an oil of known viscosity by correlating its viscosity to ESP average temperature. Watercut at the inversion point increases in case of contamination presence which directly affects the interfacial tension.
Modeled effective viscosity values for emulsion with medium viscosity are within 5% deviation from the experimental values. However, when low oil viscosity is used, the deviation becomes larger, mainly due to the instability of the emulsion which leads to inaccurate measurement of the effective viscosity at the PV. Instability is confirmed from the PV results, density measurements and visual observation through the transparent pipe or during sampling.
Further improvement of the model is needed by changing the parameters in a wider range, and possibly by including non-considered parameters such as salinity. Most of the parameters affecting the emulsion rheology are combined in one term which can be considered as a factor that corrects the effective viscosity of the emulsion.
|File Size||2 MB||Number of Pages||24|
Kokal, S. L. 2005. Crude Oil Emulsions: A State-Of-The-Art Review. Society of Petroleum Engineers. https://doi.org/10.2118/77497-PA