Experimental Investigation of the Viscous Effect on Two-Phase-Flow Patterns and Hydraulic Performance of Electrical Submersible Pumps
- Francisco E. Trevisan (C-FER Technologies) | Mauricio Prado (The University of Tulsa)
- Document ID
- Society of Petroleum Engineers
- Journal of Canadian Petroleum Technology
- Publication Date
- April 2011
- Document Type
- Journal Paper
- 45 - 52
- 2011. Society of Petroleum Engineers
- 3.1.2 Electric Submersible Pumps, 4.6 Natural Gas
- multiphase performance, centrifugal pump, viscosity, electrical submersible pump, surging
- 0 in the last 30 days
- 529 since 2007
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Using a visualization prototype built from original electrical-submersible-pump (ESP) components and with minimal geometrical modifications, a pioneer experimental procedure was developed and conducted to address the viscous effect on liquid/gas two-phase flow through these types of pumps.
Based on dimensionless groups that govern centrifugal-pump single-phase performance, two-phase experiments were conducted at different shaft speeds (15, 25, and 30 Hz), with nonslip void fractions (up to 5%), and viscosity values of 46 to 161 cp, while liquid rates were kept constant at 60% of the maximum rate at the defined shaft speed. High-speed video footage was taken from the entire impeller flow channel, and stage incremental pressure was measured.
The authors identified four liquid/air flow patterns inside the impeller channels: agglomerated bubbles, gas pocket, segregated gas, and intermittent gas. By comparing the images with the differential-pressure data, it was concluded that the agglomerated-bubbles pattern is responsible for the initial head degradation and that the surging event coincides with the gas-pocket structure, indicating that this is an interface-instability problem. Another conclusion made was that the increase in viscosity caused surging to occur at lower void fractions, which could be compensated for by increasing rotational speed.
The significance of this work is given by the fact that several authors hae investigated centrifugal-pump performance under two-phase flow; however, previous experiments have been conducted only with water as the liquid, thus neglecting the viscous effect on the two-phase-flow mixture. In most of the petroleum industry's applications, ESPs operate with oil and natural gas. The present work begins the task of addressing this knowledge gap between scientific research and field applications.
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Barrios, L. 2007. Visualization and Modeling of Multiphase PerformanceInside an ESP. PhD dissertation, University of Tulsa, Tulsa, Oklahoma.
Cirilo, R. 1998. Air-Water Flow Through Electric Submersible Pumps. MSthesis, University of Tulsa, Tulsa, Oklahoma.
Dunbar, C.E. 1989. Determination of Proper Type of Gas Separator. Presentedat the SPE Los Angeles Basin Section Microcomputer Applications in ArtificialLift Workshop, Los Angeles, 16-17 October.
Duran, J. 2003. Pressure Effects on ESP Stages' Air-Water Performance. MSthesis, University of Tulsa, Tulsa, Oklahoma.
Estevan, V. 2002. A Phenomenological Analysis about centrifugal pump intwo-phase flow operation. PhD dissertation, University of Campinas, Sao Paulo,Brazil.
Gamboa, J. 2008. Prediction of the Transition in Two-Phase Performance of anElectrical Submersible Pump. PhD dissertation, University of Tulsa, Tulsa,Oklahoma.
Lea, J.F. and Bearden, J.L. 1982. Effect of Gaseous Fluids on SubmersiblePumps. J Pet Technol 34 (12): 2292-2930. SPE-9218-PA. doi: 10.2118/9218-PA.
Murakami, M. and Minemura, K. 1974. Effects of Entrained Air on thePerformance of a Centrifugal Pump and Flow Conditions (1st Report). Bulletinof the JSME 17 (110): 1047-1055.
Patel, B. and Runstadler, P. Jr. 1978. Investigations into the Two-PhaseBehavior Of Centrifugal Pumps. Paper presented at the ASME Symposium onPolyphase Flow in Turbomachinery, San Francisco, 10-15 December.
Pessoa, R. 2001. Experimental Investigation of Two-Phase Flow Performance ofElectrical Submersible Pump Stages. MS thesis, University of Tulsa, Tulsa,Oklahoma.
Sekoguchi, K., Takada, S., and Kanemori, Y. 1984. Study of Air-WaterTwo-Phase Centrifugal Pump by Means of Electric Resistivity Probe Technique forVoid Fraction Measurement (1st Report). Bulletin of the JSME 27 (227): 931-938.
Sachdeva, R., Doty, D.R., and Schmidt, Z. 1994. Performance of ElectricSubmersible Pumps in Gassy Wells. SPE Prod & Fac 9 (1):55-60. SPE-22767-PA. doi:10.2118/22767-PA.
Solano, E.A. 2009. Viscous Effects on the Performance of ElectricalSubmersible Pumps (ESP's). MS thesis, University of Tulsa, Tulsa, Oklahoma(April 2009).
Trevisan, F.E. 2009. Modeling and visualization of air and viscous liquid inElectrical Submersible Pump. PhD dissertation, University of Tulsa, Tulsa,Oklahoma.
Turpin, J. L. and Bearden, J. 1986. Gas-Liquid Flow Through CentrifugalPumps--Correlation of Data7. Proc., Third International Pump Symposium,College Station, Texas, USA, 13-20.
Zapata, L. 2003. Rotational Speed Effects on ESP Two-Phase Performance. MSthesis, University of Tulsa, Tulsa, Oklahoma (November 2003).