Interaction between Deepwater Catenary Risers and a Soft Seabed: Large Scale Sea Trials Event: OTC Date: May 2001 Author: N. Willis, P. West Abstract The paper describes experiments completed in June 2000 as part of the STRIDE JIP – Steel Risers in Deepwater Environments 1,2. Environments1,2 . The tests investigated the interaction between a soft clay seabed, typical of deepwater developments, and a steel catenary riser (SCR). ROV surveys of deepwater SCR’s attached to floating production vessels have shown that they can cut deep trenches into the seabed. The following objectives were set: (1) To assess the effect of seabed to SCR interface forces on local riser stresses for wave and slow drift vessel motions (2) To assess the effect of different riser trenches on local riser stresses for wave and slow drift vessel motions (3) To identify the key trenching mechanisms and rates. (4) To use the test program findings to benchmark riser FEA tools, and to adjust modelling parameters to better simulate the real case as necessary. To achieve this, the seabed end of a deepwater SCR was simulated using a 360-ft long 6-inch diameter steel pipe, hung as a catenary across the soft seabed of a tidal harbour. A particular harbour location was found that had seabed properties similar to those of a deepwater Gulf of Mexico seabed. The top end of the pipe string was then actuated with carefully controlled wave and vessel drift motions to simulate a spar platform in 3,300-ft water depth. 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 Riser Monitoring & Integrity 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.