Multi-phase flows modelling in wellbore has alwaysbeen a problem to the petroleum and many other industries. In the petroleumindustry, correlations are presently in use, most of which are obsolete astheir application to field data has generated results with unacceptable errors.Most of the existing models proposed to correct these anomalies have alwaysignored the mass transfer between phases. This has created serious doubt to thepredictive capability of these models. In this study, a one-dimensionaltransient state model of multi-phase fluid flow in an inclined well has beendeveloped. The model is solved numerically to predict the pressure drop as theflow passes through an inclined wellbore and a bend. Results show that thehigher the inclination angle the higher the rate of pressure decline in theflow of the fluid to the surface, also a dramatically high pressure drop wasobserved when the flow passes through a bend. This unexpected high pressureresulting from the change in flow regime from stratified layered flow to slug flowin bend can result in a counter flow of formation fluid back into the reservoirin a low pressure reservoir thereby reducing the fractional recovery from such areservoir.
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