A new model is proposed for predicting the pressure drop in liquid-cut gas well tubing. The liquid holdup is modeled as a function of dimensionless gas and liquid velocity numbers, as well as liquid viscosity number. It involves five parameters that are related to flow regimes and can be optimized using the field data. The friction loss is based on Mukherjee and Brill correlation. In this model, the pressure gradient equation is treated as an initial value problem for an ordinary differential equation, and is directly solved by Runge-Kutta method.

Based on the field measured data from 159 gas wells covering a wide range of production conditions, the model was found to be able to predict the pressure drops with an improved overall accuracy compared to the modified single-phase model and five commonly used empirical correlations.

Sensitivity of the models to liquid/gas ratio is also presented.

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