Programme details

When the Shell Ormen Lange well delivery team was challenged to improve the well delivery schedule several ideas was identified, which were lifted into a Technical Limit Staircase based on their schedule impact. Running x-mas trees offline on wire from an intervention vessel was highlighted at this stage.
A search on previously used deployment methods globally and the expected operating conditions in Ormen Lange revealed that it was possible to proceed with the project.
The installation of four horizontal subsea x-mas trees was successfully completed in April 2009.
A reduction in installation cost of more than $4 million per tree was realised Additionally, the drill ship could remain focused on its primary activity of drilling and completing Ormen Lange wells, adding further benefit to the drilling schedule. This presentation will cover the planning process of selecting and qualifying the tree installation method, and the required work scope to complete the installation.

Experiences from the riser’s field performance during its first deployment in the summer of 2007 are also presented.