Introduction
The AFA platform currently only uses the classic “Beggs & Brill” no-slip wellbore model. The no slip assumption is only applicable in flow regimes where liquid and gas velocities are the same
Beggs & Brill
The correlation for two-phase flow by “Beggs & Brill” is based on experimental work. The duo performed 584 experiments with the following ranges of variation:
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Gas Flow Rate: 0 to 300 Mscf/D
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Liquid Flow Rate: 0 to 30 gal/min
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Average System Pressure: 35 to 95 psia
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Pipe Diameter: 1 and 1.5 in
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Liquid Hold Up: 0 to 0.870
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Pressure Gradient: 0 to 0.800 psi/ft
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Inclination Angle: -90° to +90°
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Fluids: Air and Water
References
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Multiphase Flow in Wells, James P. Brill & Hemanta Mukerjee, SPE 1999
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Penn State: College of Earth and Mineral Sciences, John A. Dutton Institute for Teaching and Learning Excellence. PNG 301 Course Notes: Introduction to Petroleum and Natural Gas Engineering. Unit 6.3.4.1