Two phase gas/liquid flow in pipe is a common
geothermal industry.In the petroleum industry,it is
encountered in the production,transportation, and
processing of hydrocarbon from oil and gas field. Twophase
flows are extremely complex and traditionally,
attempts have been made of classify the myriad of
possible flow configuration into "flow regimes".
Classically, vertical two-phase flow has been classified
into the regimes of bubbly, slug flow, and annular flow
and also horizontal two phase flow. This paper makes
an appeal for two phase flow regimes in pipeline from
platform to onshore unit. As shown, these regimes are
of considerable technological importance and possess
unusual features that justify their separate designation
and make them ripe for further study.