Abstract
The study of multiphase flow in vertical pipes is aimed at effective and accurate design of tubing, surface facilities and well performance optimization for the production of oil and gas in the petroleum industry by developing a better approach for predicting pressure gradient. In this study, field data was analyzed using mathematical model, multiphase flow correlations, statistical model, and computer programming to predict accurately the flow regime, liquid holdup and pressure drop gradient which are important in the optimization of well. A Computer programme was used to prediction pressure drop gradient. Four dimensionless parameters liquid velocity number (Nlv), gas velocity number (Ngv), pipe diameter number (Nd), liquid viscosity number (Nl), were chosen because they represent an integration of the two dominant components that influence pressure drop in pipes. These dominant component are flow channel/media and the flowing fluid. The model was found to give a fit of 100% to the selected data points. Hagedorn & Brown, Griffith &Wallis correlations and model were compared with field data and the overall pressure gradient for a total depth of 10000ft was predicted. The predicted pressure gradient measured was found to be 0.320778psi/ft, Graffith& Wallis gave 0.382649Psi/ft, Hagedorn & Brown gave 0.382649Psi/ft; whereas generated model gave 0.271514Psi/ft. These results indicate that the model equation generated is better and leads to a reasonably accurate prediction of pressure drop gradient according to measured pressure gradient.
Highlights
Multiphase flow is a simultaneous flow of materials with different phases or states flowing together
The gas and liquid phases do not travel at the same velocity in the pipe, the less dense, more compressible, less viscous gas phase tend to flow at high velocity than the liquid phase thereby causing slippage
Multiphase flow pressure drop gradient prediction, it is important to determine the pressure volume temperature (PVT) properties, flow regimes, flow parameters using correlations or from field, pressure gradient in pipes is divided into elevation, friction and acceleration components
Summary
Multiphase flow is a simultaneous flow of materials with different phases or states flowing together. The heterogeneous occurrence of two phase and three phase flows in pipes is much more complex than single-phase flow. The phases tend to separate because of difference in density. Shear stresses at the pipe are different for each phase as a result of different densities and viscosities. The volumetric gas flow rate will be increased by decreasing pressure along the pipe and increasing the volume occupied by the compressible gas phase [1]. The gas and liquid phases do not travel at the same velocity in the pipe, the less dense, more compressible, less viscous gas phase tend to flow at high velocity than the liquid phase thereby causing slippage
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