Cairn Energy required our riser analysis services for their semi-sub drilling operations over a range of water depths in Morocco, Senegal and Ireland in order to optimise tension and ensure the planned well equipment was fit-for-purpose.

Aquaterra Energy used its in-house analysis team to offer a comprehensive semi-submersible riser analysis service that enabled the client to maximise their drilling envelopes, minimise their rig downtime and save costs on their entire project.

Deep water riser analysis was required including tension optimisation, operability envelope generation, vortex-induced vibration (VIV) analysis and conductor strength analysis for a number of projects. All wells were to be drilled via a semi-submersible rig:

In each case, the Aquaterra Energy in-house analysis team assessed the riser performance against API RP 16Q using OrcaFlex models, with supplementary calculations using the mathematical software Mathcad, to include rig response amplitude operators, riser joints, tension, subsea equipment, wellhead and conductors.


The riser analysis service we provide validates and optimises conductor or riser system design making you aware of any performance improvements and also allowing international regulations and requirements to be met. Specialising in a range of conductor and riser analysis services, including but not limited to, jack-up high-pressure riser analysisplatform well conductor analysis and tieback analysis. Our highly qualified and experienced team will provide in-depth analysis which highlights specific project needs while also building bespoke models replicating situations in offshore environments, therefore meeting the individual operational requirements of our customers.

Using riser analysis against semi-subersible or drill ships boasts many benefits, including the ability to reduce any unnecessary costs. While also providing valuable insight into the operations of using a floating vessel when subjected to global dynamic loads.