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Title: Design of deepwater HP/HT pipe-in-pipe flowlines crossing mega-furrows in the Gulf of Mexico
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: 2205s
Date of Publication: Sep 1 2010 12:00AM
Price: $25.00 US
Authors: Dr Tianxi (Andy) Tang, Jacob Chacko, Mengjuan (Jane) Zhou, Gabriel O Omonoji, and Uwa Eigbe
Abstract: TWO 21-km long pipe-in-pipe (PIP) HT/HP flwlines were recently designed for the Chinook offshore oilfieldin the Gulf of Mexico. The Chinook flwline routes cross continuous mega-furrows at water depths ranging from 2660-2860m. The design temperature and pressure of the flowlines were 120°C and 875bar, respectively. Detailed finite-elementanalysis was performed to predict flowline in-place behaviour. The strain-based criterion of API RP 1111 was used where stresses were greater than ASME B31.8 allowable limits, and found to be satisfactory. Fatigue analysis of the pipe spans subjected to vortex-induced vibration (VIV) showed the need for VIV-mitigation measures, and it was decided that the entire length of the flowlines crossing the mega-furrows should be straked. The analysis of the straked flowlines resulted in a fatigue life greater than the required 25-year service life. Further analysis was performed on the PIP system to optimize the centralizer spacing to sufficienty limit the buckling of inner pipe under operational conditions, and prevent crushing of the insulation in the annulus. J-lay installation analysis determined the amount of the inner pipe pre-tensioning that was required to eliminate locked-in stresses in the inner and outer pipes.
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