Overcoming Installation Challenges to Wellhead and Conductor Fatigue Event: OMAE Date: June 2013 Author: T. Lim, R. Koska, E. Tellier Subsea wells are typically drilled and completed using marine risers with subsea BOP stacks deployed from mobile drilling units. Wave and current induced riser motions are transferred to the wellhead, conductor and casing system which can then cause fatigue issues at the critical connectors and welds. In recent years, the risk of fatigue failure has increased due to the use of 5th and 6th generation rigs with larger BOP stacks, and longer well drilling and completion durations. During the design stage, the fatigue performance of the wellhead, conductor and surface casing is often overlooked. During well construction, variations from design can occur in terms of wellhead stickup, wellhead lockdown and cement levels, both around the conductor and in the annulus between the conductor and surface casing. This paper describes analysis results showing the effect of these variations on the fatigue performance of the wellhead, conductor and surface casing. The recommended analysis load case matrix to account for these uncertainties is also presented, together with the need for as-installed assessments. Recommendations on fatigue resistant designs with equipment configuration and specification options capable of meeting these challenges are presented. Wellhead monitoring and fatigue tracking strategies that can be implemented during drilling and workover operations to address these potential concerns and manage the risk are also discussed. If you would like a copy of this technical paper register to download it (pop-up form). All technical papers Share this page Share on FacebookShare on LinkedinShare on TwitterEmail Services Production & Export Riser Concept Engineering Steel Catenary Risers Top Tensioned Risers Hybrid Risers Flexible Risers Composite Risers Subsea Jumper Spools Subsea Umbilicals Deep Sea Mining Drilling, Completion & Workover Drilling Risers Completion & Workover Risers Subsea Wellheads & Conductors Platform Conductors Well Engineering Minimum Facilities Platforms Conductor Supported Wellhead Platforms & CoSMOS Riser Delivery Management Integrity, Life Extension & Monitoring Riser Monitoring System Engineering Drilling Riser Management Anomaly & Incident Engineering Subsea Wellhead System & Life Extension Platform Well Integrity & Life Extension Inspection, Maintenance & Repair Subsea Engineering Services Component Detailed Design Decommissioning Engineering Engineering Critical Assessment Installation Engineering Mechanical Connectors Offshore Renewable Energy Qualification Testing Verification & CVA Well Plug & Abandonment Get the latest riser insights!Receive our riser news, published papers and blog posts in your inbox monthly.