Structural Casing-Wellhead-Tree-Riser System FatigueAPI Summer Standards Conference, June 2012

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Structural Casing-Wellhead-Tree-Riser System FatigueAPI Summer Standards ConferenceJune 2012

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Structural Casing-Wellhead-Tree-Riser System FatigueAPI Summer Standards Conference, June 2012

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At Issue…• Assumed VIV fatigue damage to wellhead West of Shetland in

1980s.

• Observed movements in several wellheads, N. Sea in 2005, ‘06 & ‘10

• One wellhead retrieved and inspected without findings

• Fatigue calculations from different parties with differences in results of several magnitudes.

• More recently:- GoM floating systems monitoring riser fatigue & motion- BSEE queries in early project stages

Structural Casing-Wellhead-Tree-Riser System FatigueAPI Summer Standards Conference, June 2012

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Relevant API Guidance:• 2RD - Design of Risers for Floating Production Systems (FPSs) and

Tension-Leg Platforms (TLPs) • 17A - Design and Operation of Subsea Production Systems-General

Requirements and Recommendations, 4th Edition• 17B - Recommended Practice for Flexible Pipe, Fourth Edition• 17D - Specification for Subsea Trees and Wellheads, 2nd Edition• 17E - Specification for Subsea Umbilicals, Fourth Edition• 17F - Specification for Subsea Production Control Systems, Second

Edition• 17G - Recommended Practice for Completion / Workover Risers, Second

Edition• 17H - Recommended Practice for Remotely Operated Vehicle (ROV)

Interfaces on Subsea Production Systems• 17J - Specification for Unbonded Flexible Pipe, Third Edition• 17K - Specification for Bonded Flexible Pipe, Second Edition• 17M - Recommended Practice on Remotely Operated Tool (ROT)

Intervention Systems

Structural Casing-Wellhead-Tree-Riser System FatigueAPI Summer Standards Conference, June 2012

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