Wood Group - A Holistic Approach to Life Extension
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21-23 April 2015
17-18 October 2016Katy, Texas, USA
DNV GL
SPE Deepwater Asset Integrity and Field Life Extension Workshop
A Holistic Approach to Life ExtensionTravis Cummins – Structural IM Team Lead
2SPE Deepwater Asset Integrity and Field Life Extension Workshop
The Holistic Approach
• When a design life is defined, it frequently governs several systems or the entire facility, not just a single system
• Frequently, approaches to life extension focus on each system individually, instead of taking a higher‐level, holistic approach
• By performing life extension at the facility level, it allows operators to identify and exploit efficiencies across systems
3SPE Deepwater Asset Integrity and Field Life Extension Workshop
GoM Life Extension Assessment
• Deepwater GoM platform was still early in its original design life • In order to sanction expansion tieback, life extension feasibility study and preliminary assessment needed to be conducted for approval from partners
• Operator approached WG to perform feasibility study, gap analysis of current integrity management activities, and develop high‐level cost estimate of probable major life extension activities
• Investigated three LE scenarios:• From 20 years to 30 years• From 20 years to 40 years• From 30 years to 40 years
4SPE Deepwater Asset Integrity and Field Life Extension Workshop
Project Basis
• Deepwater (~5000 ft) facility located in GoM
• Design life of major systems:• Hull structures & mooring – 20 yrs• Topsides structures – 40 yrs• Topsides equipment – 20 yrs• Subsea production – 30 yrs• Export risers/pipelines – 20/30 yrs
• For consistency between systems, LE process used was based on modified NORSOK Y‐009
Initiate Life Extension Process
Condition Assessment Define Life Extension Premise
Reassessment Based on Current Condition
Integrity Acceptable Identify Corrective Modifications
Modifications Feasible
STOPDecommission at end of
current design life
Yes
No
Document Life Extension Activities
Implement Life Extension Program
Yes
No
5SPE Deepwater Asset Integrity and Field Life Extension Workshop
Example Integrity and Data Gaps
• Topsides Fixed Equipment• No inspection data or planned inspections for HP flare tip
• Hull and Mooring• No baseline mooring chain measurements and insufficient quantity of in‐service chain measurements for long term trending of data
• Export and Production Risers• Uncertainty related to remaining life of export flex joints
• Export Pipelines• Potential excessive anode wastage on pipelines may require cathodic protection design review and anode retrofit
6SPE Deepwater Asset Integrity and Field Life Extension Workshop
Multi‐Disciplinary Activities
• Several key activities identified that benefited from a multi‐disciplinary approach:
• Additional inspection activities for underwater hull and subsea systems that would allow for combined campaigns and lower overall costs
• Potential single mobilization of heavy lift vessel for mooring and topsides equipment replacement activities
• Proactive planning and procurement of cathodic protection remediation/replacement activities for multiple systems
• Assessment of data gaps across systems
7SPE Deepwater Asset Integrity and Field Life Extension Workshop
Benefits of Holistic Approach
• Holistic approach allows operators to better plan for anticipated costs associated with continued service
• Allows for better allocation of resources through scheduling of IM and life extension activities
• Ensures that interfaces between systems are effectively managed and don’t slip through the cracks
• Integrity or data gaps for all systems can be identified and addressed resulting in a consistent approach
• Single focal point results in simpler contractor management for operator
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