A numerical simulation for vertical multiphase systems has been developed, based on the original concepts presented by J. Orkiszewski. The rather marked variability for different flow regimes in a given well and the simultaneous coexistence of these various regimes at different depths are properly accounted for in the interative calculation of the pressure distributions. The method features the most reliable and proven correlations available for each of the flow regimes encountered. A programmed data package in support of the above correlations is described.

The concept of "Lifting Potential" introduced in an earlier paper has been programmed, permitting applications in programmed, permitting applications in a variety of multiphase flow problems. These include both steady and unsteady state applications. In general, the applications involve the study of "heading," "loading," "unloading," and "dying" of gas wells subject to liquid production, as well as different well production, as well as different well engineering and design optimization problems encountered in gas-lift and problems encountered in gas-lift and condensate production.


The occurrence of two-phase flow in vertical flow systems is common to many engineering applications. Problems ranging from oil field technology to boiler design, from nuclear reactors fluidized beds, from special heat exchangers to thermosiphon reboilers frequently encounter conditions of multiphase flow.

The main problem of engineering interest in vertical two-phase flow may be defined as follows: Knowing the physical properties of each phase, physical properties of each phase, geometry of the flow system and conditions prevailing at one terminus to predict the pressure distribution along predict the pressure distribution along the pipe.

The literature available on vertical two-phase flow includes a large variety of correlations, analytical and empirical methods developed for prediction of energy losses as well as the flow regimes. It is significant to note that the references quoted above belong to two notably different schools of thought. The first group of papers, references 1 through a correlate friction losses by a unique energy loss factor without any particular regard to "slippage." particular regard to "slippage."

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