Pipe-in-pipe riser system, bends overcome HP/HT challenges: Innovative construction techniques provide superior performance

摘要

The never-ending battle to extract more reserves from mature provinces such as the UK sector of the North Sea has seen new precedents set for temperature and pressure requirements in rigid riser systems. The need to transfer multiphase products increasingly from HP/HT wells back to shore makes this challenge even more demanding. In a recent project, for example, riser materials were exposed to extreme temperatures ranging from 180℃ to -30℃ (356℉ to -22℉) in certain well conditions.