Two mechanistic models for multiphase flow calculations are presented. They result from a 10 year research program and predict pressure and temperature profiles in oil wells and pipelines.

These models are based on the theory of fluid mechanics and on experiments carried out in oil industry conditions. The experimental facility consists in long testing lines, 3 and 6 inches in diameter, inclinable from 0 to 90°. Liquid hydrocarbons, water and natural gas have been used to generate multiphase flow at pressures up to 50 bar.

Results of these models have been compared with field data gathered on producing wells and pipelines. A better accuracy is obtained than with conventional methods.

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