The flow patterns of oil-water flow in horizontal pipelines mainly consist of three kinds,separated flow,dispersed flow and mixed flow (dispersion of oil in water over a water layer O/W & W) while the water percentage above 80% , which are observed by some researchers.

Study on drag reducing theory and technique of oil-gas-water three-phase flow;

Constraint programming(CP)method has been applied to construct crude feeding model for refineries.

This method is considered to be accurate in identifying flow pattern oi gas-liquid two phase flow pipeline through example validation,which can be taken as a method to identify flow pattern in calculation of oil-gas mixing transportation process.