Multiphase flow conditions occur in a wide range of engineering applications in the petroleum, chemical, and nuclear industries. The design of production systems involving different fluids requires an accurate prediction of the pressure loss. Existing methods rely on the prediction of flow patterns based on observed field and experimental data. However the patterns are not applicable to all conditions and the predicted pressure drops deviate from actual observations.

This paper describes the new model developed to predict pressure drop for vertical, inclined, and horizontal pipes and wellbores. The model is composed of fluid property correlation, flow pattern prediction, and pressure drop determinations.

The model performance is evaluated using published data, The model predictions are also compared with a commercially available model. The overall performance of the model is in good agreement with data. In comparison with the published data, the model predictions resulted in the least average error.

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