[Posted on June 20th 2014 by Bill Stewart]
A thorough riser analysis is important for platform production reasons, particularly for offloading fluids. State-of-the-art marine technology software, such as Orcina’s OrcaFlex package, permits an accurate evaluation, identifying areas that may need improvement.
Risers, vital to oil and gas offshore platform production and transfer, are responsible for the safe, efficient transmission of fluids or gas from drilling facilities to collection vessels, typically tankers. Drilling companies need accurate riser analyses from qualified engineering firms to ensure proper design and installation of these systems.
Some Components of Evaluating Risers
In most cases, this analysis, formerly classified as “static,” has been supplanted by new technology, permitting a more effective “dynamic” evaluation process. State-of-the-art technology has improved the quality of riser evaluation studies.
- Assess the requirements placed on risers, particularly when facing strong wave action in deeper sea depths.
- Responses of undersea risers to ocean currents and formidable surface waves.
- Predictions of dynamic behavior when embroiled in excessive environmental and external loads.
- Evaluation of the potential external forces, both undersea and surface conditions that can affect riser and deep ocean pipe performance.
- Transfer efficiency of platform liquids or gas to surface collection vessels.
- Effects of wave-generated and tidal currents on riser systems.
- Response of risers to “static axial force” and wave load in normal and extreme environments.
These are some components of riser analysis that produce results that are either encouraging or disappointing to companies with previously installed systems. During the design phase, these analysis results will either confirm or recommend changes in riser installation plans.
In all cases, this evaluation is critical to current and future offshore platform production. For instance, outstanding drilling platform production that faces serious challenges during transfer to surface collection vessels can reduce the true production quotient of the operation.
Current technology is a vast improvement over the classic static analysis of former evaluations. The ability to computers to simulate environments and possible effects enhance the quality of the analysis and its conclusions.
Experience Is Important
Technology alone does not replace experience in analyzing riser efficiency or durability. Experience working with riser designs and real-world installations helps evaluators make more accurate conclusions regarding the risers under study.
For example, Stewart Technology Associates has compiled over 20 years’ experience performing riser analysis. Founder Bill Stewart, P.E., long ago committed to intense study of risers. He has since dedicated his studies to advancing the knowledge base surrounding marine studies of riser technology and performance limitations.
Our company has earned an impressive reputation for excellence in marine analysis and problem solving. One of our specialties is analyzing risers for companies around the world. As a member the Society of Naval Architects, Bill Stewart has a background to match his expertise with riser analysis. This evaluation is similar to a seakeeping analysis in that it identifies the “seaworthiness” of undersea risers.
When combined with extensive experience working with and analyzing risers, current technology, like OrcaFlex software, enables professionals, such as Stewart Technology Associates, evaluate riser systems of any type accurately. The scientific analysis results provided by the technology are interpreted correctly, predicting how the studied risers will perform in all sea conditions and environments.