M.R.meysam Dehbalaei - M.S. Student, Department of petroleum engineering, Petroleum University of Teghnology,Ahwaz,Iran
M.R mehdi Bahari Moghadam - Associate Professor, Department of petroleum engineering, Petroleum University of Technology,Ahwaz,Iran
Zara Mirbagheri - B.Sc. , Shahrood University of Technology,Semnan,Iran

Two phase gas/liquid flow in pipe is a commonoccurrence in the petroleum,chemical,nuclear andgeothermal industry.In the petroleum industry,it isencountered in the production,transportation, andprocessing of hydrocarbon from oil and gas field. Twophaseflows are extremely complex and traditionally,attempts have been made of classify the myriad ofpossible flow configuration into flow regimes .Classically, vertical two-phase flow has been classifiedinto the regimes of bubbly, slug flow, and annular flowand also horizontal two phase flow. This paper makesan appeal for two phase flow regimes in pipeline fromplatform to onshore unit. As shown, these regimes areof considerable technological importance and possessunusual features that justify their separate designationand make them ripe for further study.

Flow Regime, Two phase Flow, Pipeline,offshore,Platform