Third Generation Deepwater Hybrid Risers Event: World Wide Deepwater Technologies, IBC Date: June 1999 Author: S. Hatton, F. Lim As oil exploration and production move into deeper water there is a need to develop technically viable and cost effective risers. A candidate riser arrangement is the hybrid riser system, which is the basis for a number of developments offshore West Africa. Hybrid risers consist of a vertical bundle of steel pipes supported by external buoyancy. Flexible jumpers connecting between the top of the riser and the vessel are used to accommodate relative motion between the vessel and riser bundle. The first generation hybrid risers, which were installed in the Gulf of Mexico, were designed for a large number of flow paths and were installed through the moonpool of a drilling vessel. However, due to the large size, design complexity and weight of these systems installation was very costly. The second-generation hybrid riser design, proposed for Girassol, is fabricated at an onshore site with installation by tow out and upending. This approach provides significant cost reductions as a result of weight savings, design simplification and reduction of installation schedule. The disadvantages of both first and second-generation hybrids are: Design complexity of the bundle Installation risk Low field development flexibility The Concentric Offset Riser (COR), developed by 2H Offshore, may be considered to be a 3rd generation Hybrid riser. It offers many of the benefits of the earlier concepts but, having a simple bundle design, can be quickly and economically installed from a drilling vessel. This greatly reduces risk and the smaller bundle arrangement increases development flexibility. The following paper describes the system arrangement, preliminary analysis results and costing data. 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 Twitter Services Production & Export Riser Concept Engineering Steel Catenary Risers Top Tensioned Risers Hybrid Risers Flexible Pipes & Risers Corrosion Resistance and Composite Risers Subsea Jumper Spools Subsea Umbilicals Deep Sea Mining Integrity Engineering, Life Extension & Monitoring Riser Integrity & Life Extension Platform Well Integrity & Life Extension Subsea Wellhead System & Life Extension Machine Learning for Riser Engineering Riser System Digital Twin Drilling Riser Management Riser Monitoring System Engineering Riser Inspection, Maintenance & Repair Anomaly & Incident Engineering Subsea Engineering & Assessment Services Component Detailed Design Offshore Decommissioning Engineering Fracture Mechanics and Engineering Critical Assessment Installation Engineering Mechanical Connectors Offshore Renewable Energy Systems and Qualification Testing System Verification & CVA Well Plug & Abandonment Drilling, Completion & Workover Drilling Risers Subsea Completion & Workover Risers Subsea Wellheads & Conductors Offshore Platform Conductors Well Engineering and Casing Design Platform Design and Engineering Conductor Supported Wellhead Platforms & CoSMOS Monopile Wellhead Platforms Exploration to Early Production Systems Structural Engineering Services Riser Delivery Management & Systems Engineering Get the latest riser insights!Receive our riser news, published papers and blog posts in your inbox monthly.