Lazy Wave Steel Catenary Riser Design Optimisation in Digital Field Twin

2020 ◽  
Author(s):  
Subrata Bhowmik ◽  
Harit Naik ◽  
Gautier Noiray
Keyword(s):  
Design Optimisation ◽  
Steel Catenary Riser ◽  
Riser Design

Strength Performance of Steel Catenary Riser Using Short Term and Long Term Analysis Methodologies

2016 ◽  
Author(s):  
Feng Wang ◽  
Roger Burke ◽  
Anil Sablok ◽  
Kristoffer H. Aronsen ◽  
Oddgeir Dalane
Keyword(s):  
Bending Moment ◽  
Current Profile ◽  
Short Term ◽  
Sea State ◽  
Strength Performance ◽  
Steel Catenary Riser ◽  
Analysis Methodology ◽  
Riser Design ◽  
Term Analysis

Strength performance of a steel catenary riser tied back to a Spar is presented based on long term and short term analysis methodologies. The focus of the study is on response in the riser touch down zone, which is found to be the critical region based on short term analysis results. Short term riser response in design storms is computed based on multiple realizations of computed vessel motions with various return periods. Long term riser response is based on vessel motions for a set of 45,000 sea states, each lasting three hours. The metocean criteria for each sea state is computed based on fifty six years of hindcast wind and wave data. A randomly selected current profile is used in the long term riser analysis for each sea state. Weibull fitting is used to compute the extreme riser response from the response of the 45,000 sea states. Long term analysis results in the touch down zone, including maximum bending moment, minimum effective tension, and maximum utilization using DNV-OS-F201, are compared against those from the short term analysis. The comparison indicates that the short term analysis methodology normally followed in riser design is conservative compared to the more accurate, but computationally more expensive, long term analysis methods. The study also investigates the important role that current plays in the strength performance of the riser in the touch down zone.

Steel Catenary Riser Design Based on Prescribed Motions From Coupled Analysis Methodology

2008 ◽  
Author(s):  
Marcos Vinicius Rodrigues ◽  
Vigleik L. Hansen ◽  
Rodrigo Almeida Bahiense ◽  
Celso Velasco Raposo
Keyword(s):  
Coupled Analysis ◽  
Steel Catenary Riser ◽  
Analysis Methodology ◽  
Riser Design

Deepwater SCR Benchmarking Methodology

2011 ◽  
Author(s):  
Songcheng Li ◽  
Lee Tran ◽  
Prahlad Enuganti ◽  
Mike Campbell ◽  
Yiannis Constantinides
Keyword(s):  
Gulf Of Mexico ◽  
Design Process ◽  
Environmental Conditions ◽  
Field Measurements ◽  
Design Parameters ◽  
Spar Platform ◽  
Steel Catenary Riser ◽  
Comprehensive Database ◽  
Riser Design

One of the primary goals of riser monitoring is to build a database of measured riser behavior during different environmental conditions and compare against design predictions during each period. A comprehensive database of field measured riser response provides not only a dataset to benchmark riser performance but enables the calibration of design parameters for future risers. The calibrated set of design parameters would feedback to establish a more representative riser design process and provide greater confidence during future riser designs. The following paper establishes a methodology to benchmark riser behavior against software predictions with applications specific to a steel catenary riser (SCR) suspended from a spar platform. Aspects and challenges dealing with processing of inclined sensors to derive global motions and operational effects are discussed and addressed. A demonstration of the methodology is presented using field measurements from a Gulf of Mexico deepwater SCR under storm conditions. The riser behavior of interest for this study is specifically the touchdown motions and stress but additional comparisons are made along the entire riser length.

Steel Catenary Riser Response Identification Based on Field Measurements

2011 ◽  
Author(s):  
Yiannis Constantinides ◽  
Lee Tran ◽  
Prahlad Enuganti ◽  
Mike Campbell
Keyword(s):  
Large Scale ◽  
Field Measurements ◽  
Small Scale ◽  
Steel Catenary Riser ◽  
The Past ◽  
Need To Evaluate ◽  
Large Scale Field ◽  
Steel Catenary Risers ◽  
Riser Design ◽  
Touchdown Point

The existing riser design and analysis methodologies rely on empirically derived parameters to conservatively represent the complex dynamic behavior. With exploration moving to deeper water and the increasing need of existing asset support, there is a strong need to evaluate and refine these methodologies. This is especially true for Steel Catenary Risers (SCR) as they are the most widely used riser type and due to their complex soil-pipe interaction at the touchdown point. Given the small amount of small scale experiments that have been performed in the past, there is a strong industry need for large scale field measurements. This paper presents valuable field data collected from a deepwater SCR under storm conditions. The presented data includes riser accelerations and strains compared against vessel motions. The measured SCR response is also analyzed and qualitatively compared against the current understanding of SCR response that constitutes the industry analysis methodologies.

Lazy Wave Riser Design in High Current and Mild Sour Environment

2019 ◽  
Author(s):  
Rupak Ghosh ◽  
Carlo Pellegrini ◽  
Tyler J. Visco
Keyword(s):  
High Current ◽  
Design Requirement ◽  
Innovative Design ◽  
Steel Catenary Riser ◽  
Fatigue Design ◽  
Design Life ◽  
Significant Damage ◽  
New Frontier ◽  
Riser Design ◽  
Very High

Abstract This paper presents an innovative design of Lazy Wave Steel Catenary Riser (LWSCR) associated with a major deepwater development in a new frontier and in very high current. The conventional LWSCR design with distributed buoyancy is not found acceptable considering fatigue design acceptance criteria in mild sour environment. The major design requirement is to meet acceptable design life of 20-yrs considering significant damage accumulated due to Vortex-induced-vibration (VIV) and motion fatigue. Further, other development basis including flow assurance requirements and reservoir souring are critical requirements for the design of the riser system. The paper presents a very useful insight in how several qualified technologies can be leveraged to result in a workable riser design in a very aggressive execution schedule. The results from the analyses of a production LWSCR are presented in the paper.

Steel Catenary Riser Design for Cylindrical FPSO Application in Ultra-Deep GoM

2014 ◽  
Author(s):  
J. Vidic-Perunovic ◽  
X. S. Guo ◽  
L. Wang ◽  
F. Hopen ◽  
W. J. Head
Keyword(s):  
Steel Catenary Riser ◽  
Riser Design

Effect of Polyester Mooring Stiffness on SCR Design for FPSO Application

2012 ◽  
Author(s):  
Gwo-Ang Chang ◽  
Pao-Lin Tan ◽  
Ken Huang ◽  
Tom Kwan
Keyword(s):  
Global Analysis ◽  
Dynamic Stiffness ◽  
Cost Effective ◽  
Systematic Investigation ◽  
Steel Catenary Riser ◽  
Motion Responses ◽  
Stiffness Model ◽  
Riser Design ◽  
The Impact ◽  
Selection Of

Polyester rope is a visco-elastic material and its stiffness is affected by mean tension, tension amplitude, loading period, and loading history. Qualitatively it may be felt that rope stiffness significantly affects vessel offset, which in turn affects riser performance and cost. However, a systematic investigation of the impact of rope stiffness on riser stress and fatigue life has not been published for a wide variety of design conditions. This paper describes such a study, and provides specific guidance to designers for the prudent selection of a rope stiffness model and values to achieve safe and cost effective riser design. This study investigated the effect of polyester rope stiffness on steel catenary riser (SCR) design for an FPSO sited in a variety of water depths considering environmental conditions representative of West Africa. Static/dynamic stiffness models for polyester rope in the recently issued ABS Guidance Notes on the Application of Fiber Rope for Offshore Mooring [1] were used in a global analysis to provide motion responses for the riser analysis. Time domain riser analysis was performed to obtain maximum riser stress and fatigue damage under various conditions. Based on the results of the investigation of riser and mooring analysis, guidance on the impact of rope stiffness to the riser design has been developed.

Worldwide Approximations of Current Profiles for Steel Riser Design: The WACUP Project

2012 ◽  
Author(s):  
Marc Prevosto ◽  
George Z. Forristall ◽  
Gus Jeans ◽  
Christelle Herry ◽  
Gavin Harte ◽  
...  
Keyword(s):  
Best Practice ◽  
Data Sets ◽  
Current Profile ◽  
Self Organizing Maps ◽  
Steel Catenary Riser ◽  
Large Current ◽  
Riser Design ◽  
Comparison Of The Results

This paper describes the objectives and methodology of the WACUP (Worldwide Approximations of Current Profiles) Joint Industry Project. The project goal is to establish best practice for reducing large current profile databases into a smaller, representative set of profiles for riser design. We studied the use of the following three techniques for comparing and reducing measured in-situ databases: Empirical Orthogonal Function (EOF), Self Organizing Maps (SOM) and classical Current Profile Characterisation (CPC). We evaluated the skill of these three techniques in estimating Vortex Induced Vibration (VIV) fatigue damage to a Steel Catenary Riser (SCR). Our measure of skill was the comparison of the results from the reduced data sets with results from the original complete database. The standard techniques were modified and accuracy was improved. The role of numerical current models to complement in-situ measurements in riser design was also assessed.

Steel Catenary Riser Design and Analysis for Petrobras Roncador Field Development

2005 ◽  
Author(s):  
E.C. Gonzalez ◽  
M.M. Mourelle ◽  
J. Mauricio ◽  
T.G. Lima ◽  
C.C. Moreira
Keyword(s):  
Steel Catenary Riser ◽  
Field Development ◽  
Riser Design
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