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Case Study

Chevron Wheatstone Project

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Chevron Wheatstone subsea flowlines and pipelines concept: FEED, detailed design, procurement, and construction management support

The Challenge

  • Engineering Critical Assessment (ECA) of infield flowlines:  ECA of the 24-inch CRA clad and 14-inch CRA lined flowlines was challenging due to the high values of out-of-roundness and non-overmatching CRA welds (at high temperature operating condition). 
  • Lateral buckling and axial walking of the high temperature, high pressure (HTHP) flowlines:  The flowlines operate at high temperature and pressure, making the flowlines susceptible to lateral buckling and axial walking.  
  • Stability of the export trunkline:  he trunkline crosses existing pipelines and approaches the shore in shallow water, making efficient stability design challenging. 
 

Our Approach

  • ECA of infield flowlines:  The ECA study was performed considering information from DNV JIP on CRA pipe, information from the public domain and in-house expertise. A state-of-the-art load-controlled 3D fracture mechanics based numerical model was constructed and verified. Detailed material test results and post-test analyses including statistical analysis were used to derive characteristic properties for ECA calculations.
  • Lateral buckling and axial walking of the HPHT flowlines:  A systematic review of alternate methods and the implications of their application to the Wheatstone flowlines was performed. Detailed assessment of the selected design was performed using IntecSea’s in-house expertise and models to ensure a robust lateral buckling and axial walking solution.
  • Stability of the export trunkline:  3D dynamic stability analysis using IntecSea’s INSTAB tool, developed and verified in-house for efficient and robust pipeline stability analyses, was performed.

Value Delivered

  • ECA of infield flowlines:  A detailed set of optimised flaw sizes was derived. This, combined with continuous support during the installation campaign yielded a significant benefit to the installation schedule. The lay rate of the 14-inch flowlines was double the original estimate resulting in significant cost savings. 
  • Lateral buckling and axial walking of the HPHT flowlines:  Robust and effective lateral buckling and axial walking solution achieved.
  • Stability of the export trunkline:  Robust and effective stability solution achieved including at pipeline crossing and shore approach.
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The results

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