Riser analysis challenges engineer consultants with problems beginning with anchor analysis and working towards the surface to the buoy or platform. The ocean, as calm as it seems on the surface at times, constantly moves below as currents at many depths and in many directions. Old school risers failed because they were installed as a static system, ignoring the stresses of motion. When a westerly current at forty fathoms wrestled against a southeasterly current at eighty fathoms, the riser assembly twisted and stretched until material fatigue snapped a weak spot. Riser analysis became a popular approach to assure dynamic stability on the rig.
Riser analysis allows for a dynamic design, using the motion of the currents to move the riser for less stress without losing the integrity of the strength of any section of the riser assembly. This philosophy of bend but don’t break permits erection and residency in more turbulent waters. As anchor analysis matured, our engineering skills turned to technology and computerized models to help analyze complex models of fluid dynamics.
Stewart Technology Associates (STA) leads the marine technology consultancy industry with engineer consultants dedicated to marine and offshore structure services. We receive the call from around the world to resolve the most difficult marine based issues. Our engineers have answered that call to provide design work in every region of the world. No matter how remote, we will offer assistance. We have dedicated twenty years to such issues as riser analysis, and we have achieved the status of leading innovators in the study and design of risers.
A key area of technological innovation for STA is riser analysis. Using our 20 years of experience on a variety of riser analysis projects, we assist you and achieve quality solutions. One tool of choice for us is Orcina’s OrcaFlex marine technology software which was found to be accurate and reliable. With the proper software and experienced engineers, we can overcome any obstacle to develop a workable and satisfactory solution for your riser needs. Stewart Technology Associates (STA) is really the best choice to partner with to analyze your riser challenges and find the correct solution.
Stewart Technology Associates (STA), after over twenty years in the business of ocean marine technologies, has experience in every open water condition and platform or mooring application. The analysis uses various input tools to closely model your specific application. Depths, currents, surface weather, winds, application and various other factors are calculated into our design model. Once the model is built, we have the experience to run “what if” scenarios to fine tune your design to best fit your application and marine environment. After all, the environment usually generates the more challenging puzzles.
Anchor analysis relies on soil sampling and analysis. The model builds from that point to achieve proper mooring or stable platform properties. No matter the soil, current conditions, wave strength, turbulence, weather, winds or storm frequency and severity, we can model and resolve riser issues in any environment. And we have over the last twenty years. Give us an opportunity to prove our value. Our customers become clients and valued collaborators.
Published by Bill Stewart on August 18, 2016
How can riser analysis help my company?
Whether you are designing a riser system or deploying one during drilling or production operations, you need to have a good idea of how the system will be affected by the forces at work in the marine environment. This includes wave action, tidal forces, changing weather conditions and extreme undersea pressures. Riser analysis can be used to accurately model these forces through hydrodynamic analysis, finite element analysis and other techniques, allowing you to account for them properly during the design or deployment of riser systems. This can have significant benefits for your company, including:
Reduced Development Costs:
By analyzing multiple riser designs, eliminating poor designs and improving mediocre ones, much of the expense of prototyping and testing designs that later prove to be substandard can be eliminated.
Improved Riser Designs:
Using riser analysis, each riser design can be thoroughly examined for structural problems, weak points or maintenance issues before production, allowing improvements to be made that reduce maintenance and enhance durability.
Improved Riser Deployments:
With riser analysis, you can model the platform, sea floor, buoys and other nearby structures to determine the best position for the riser installation, minimizing risk of damage, leaks or poor performance.
With improved riser designs and better riser deployments, the safety of the drilling or production operation increases significantly, reducing injuries and minimizing liability.
With efficient riser designs and deployments, along with reduced downtime from riser failures, production can be increased significantly, leading to greater profits.