Risers & Conductors

LICengineering provides conceptual and detailed design work and structural analyses of offshore well conductors with significant works in Danish, Norwegian, British and middle East waters stretching more than 3 decades back. This work includes both free standing and jacket supported conductors. These analyses have utilized LICengineering‘s unique computer programs, developed for dynamic analyses, including both axial/functional loads, wave loads, and vortex shedding induced vibrations. Some of these jobs have included the special hydrodynamic load patterns, arising in conductor arrays (shielding/blocking). Moreover, some projects have related to immediate assessment and repair proposals for damaged conductor systems.

For offshore well conductor systems we utilize in-house developed software which calculates the true axial loading in various part of the conductor/casing system including soil effect, annulus cementing and hanger systems. As well as effect of gaps in the support systems, the methods are combined with our recognized in-house programs for determination of the VIV response and direct wave loading to obtain the true dynamic loading on the system. With these methods we have been assigned to calculate a major part of the exploration and fixed platform conductors in the Danish North Sea sector as well as many conductors in other waters. Part of this work is detailed fatigue analyses including performance evaluation of the casing connectors. 

For platform risers we utilize a similar approach, and our methods are generally recognized to be more accurate and less conservative than traditional simpler methods. Detailed riser design pre- or post-installation on the offshore jackets is a on of our major work areas including single risers, caisson risers, piggy-backed or clamp bundled risers, J-tube systems and clamp systems for post-installation.