Production logging is one of the most important aspects of managing oil/gas production of a field. It provides insight into the type and rates of fluid flow in the reservoir, which is critical to optimizing the life of the well. In multiphase oil production logging one would like to derive, from limited down-hole information on pressure loss and phase holdup, the oil and water production rates one can expect in near-horizontal tubing. A study based on the flow pattern prediction model developed by Trallero (1995) was carried out in order to investigate flow-pattern transitions, holdup and pressure gradient in oil-water flows. The steady-state one-dimensional two-fluid model for stratified flow and the homogeneous model for dispersed flow were used for holdup and pressure gradient prediction. A comparison of theoretical results with very recently published experimental data for horizontal and inclined pipes covering a significant range of pipe sizes was performed and the agreement was quite good. Subsequently, the oil and water superficial velocities were calculated from pressure drop and holdup data through the herein proposed inverse mode prediction technique. The agreement with experimental data is quite satisfactory.
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