Motion and responses for deepwater production systems
Transcript of Motion and responses for deepwater production systems
![Page 1: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/1.jpg)
Norsk Marinteknisk Forskningsinstitutt
PEMEX‐INTSOKDeepwater Technology Seminar
Cuidad del Carmen, May 9‐10, 2013
By Petter Andreas Berthelsen
MARINTEK USA Inc
Motion and responses for deepwater production systems
![Page 2: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/2.jpg)
Introduction
Exploration of oil and gas in deeper water in areas where the weather conditions are extreme gives several challenges that need to be solved, e.g.:
• Wave‐current interaction• Extreme waves; higher order and viscous drift forces• Large mooring line forces• Green water and wave impact• VIV
• MARINTEK has long traditions with developing methods, carrying out analyses and verification with model tests of marine structures in deep water.
![Page 3: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/3.jpg)
About MARINTEK
MARINTEK is a contract research institute within marine technology.
MARINTEK carries out contract R&D for marine related industries:• Maritime• Oil and Gas• Ocean Energy
Main Research areas are:• Hydrodynamics and structures• Energy and machinery technology• Operations technology
![Page 4: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/4.jpg)
4
MARINTEKNorwegian Marine Technology Research Institute
Main office in Trondheim, NorwayOffices in Oslo and BergenSubsidiary in Houston; MARINTEK (USA), Inc.Subsidiary in Rio de Janeiro; MARINTEK do Brasil, Ltda.
Marine Technology Centre, Trondheim
Rio de Janeiro
MARINTEK do Brasil, Ltda.
Houston
MARINTEK (USA), Inc.
Trondheim
OsloBergen
![Page 5: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/5.jpg)
Ocean Basin Laboratory (80x50x10 m)
MARINTEK operates national marine technology laboratories
![Page 6: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/6.jpg)
6
Model tests in the Ocean Basin
![Page 7: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/7.jpg)
Ocean Basin model test
Typical test set‐up:•Measurement of:
− 6 DoF motions by use of optical position meas. system
− Mooring line and riser forces− Relative wave elevation close to structure− Impact loads
•Observation (by video):− Green water− Motions of mooring lines and risers (by
underwater video)
![Page 8: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/8.jpg)
Challenge:Deepwater system design verification by model tests
Ocean Basin 10m deepModel scale 1:150
Example: FPSO 3000 m water depth
Hydrodynamic loads not directly influenced by mooring/riser system
Can truncate mooring/risersto obtain hydrodynamic characteristics of floater
![Page 9: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/9.jpg)
Truncation of mooring and riser system
• Truncated system should maintain the same hydrodynamic characteristics of the floater as the full depth system
• It is required that the responses measured with the truncated system can be reproduced by a coupled simulation model
− This numerical model will be used to obtain design values for the full depth system
=> Hybrid verification procedure
![Page 10: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/10.jpg)
Hybrid verification procedure
![Page 11: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/11.jpg)
Full depth and truncated mooring systems (VERIDEEP)
![Page 12: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/12.jpg)
Quasi‐static characteristics comparison
Restoring force and single line Surge vs pitch
![Page 13: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/13.jpg)
Comparison of dynamic line forces (VERIDEEP)Reduced depth Full depth
![Page 14: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/14.jpg)
An active hybrid decomposed mooring system (HydeMoor) for model testing of deepwater offshore platforms
To be presented at OMAE2013, Nantes, France
![Page 15: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/15.jpg)
From laboratories to numerical simulation tools
MARINTEK analysis tools
• SIMO – Simulation of rigid multibody system
• RIFLEX – Global analysis of risers, mooring, umbilicals
• MIMOSA – Mooring analysis
• SIMLA – Simulation of Pipe laying
• BFLEX – Local analysis of flexible risers• UFLEX – Local analysis of complex risers
• MULDIF 2 – Next generation potential flow solver
• SIMA – Graphical user interface
![Page 16: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/16.jpg)
Example: Disconnected turret buoy system
• Coupled time domain analysis− Turret buoy 6DOF rigid body− Riser: FEM with pipe‐in‐pipe inside bellmouth− Umbilicial: FEM
![Page 17: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/17.jpg)
17
Example: Disconnected turret buoy system
Visualization: SimVis
![Page 18: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/18.jpg)
18
Example: Hybrid Risers/Disconnectable Turret/FPSO System
Visualization: SimVis
![Page 19: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/19.jpg)
19
Example: Hybrid Risers/Disconnectable Turret/FPSO System
Visualization: SimVis
![Page 20: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/20.jpg)
Example: Turret Disconnection
20
Visualization: SimVis
![Page 21: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/21.jpg)
21
Wave current interactions: Mooring line forces
6800 kN
4500 kN
Difference is larger than the line force from the current alone
![Page 22: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/22.jpg)
Wave current interactions: Air gap
Increased wave amplification around semi columns with current present (MULDIF‐1, Zhang et al., 2007)
![Page 23: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/23.jpg)
MULDIF‐2 Development
• Internal development at MARINTEK throughout 5 years
• Industry code implementation performed as a JIP− Present participants: Statoil, Aker Solutions, NOV‐APL, Rolls‐Royce Marine, DNV, MARINTEK
• Overall objective to develop a hydrodynamic potential theory code that handles various problems not handled well by excisting industry codes
− Effect from wave‐current interaction− Significant wave drift forces => large mooring and thrust forces− Airgap (increased wave amplification)
− It needs to be user friendly, robust and well validated
• Phase 1 (2010‐2013)− Focus on wave‐current interactions for single problems in deep and finite water depths
• Phase 2 (2013‐2015 plans)− Focus on semi‐empirical practical nonlinear corrections for higher sea states and for viscous effects − Multibody with current
![Page 24: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/24.jpg)
SIMA – MARINTEK Workbench
• Developed in a JIP between MARINTEK and Statoil ASA. • The main simulation programs presently available through the SIMA interface are:
− SIMO− RIFLEX− SIMO/RIFLEX coupled analysis
• Future support− SIMLA− MULDIF2
• Purpose:− Make the task of setting up a
simulation model of a dynamic system easier and faster.
− Visualize everything− Workbench that presents the user
with a common interface no matter which simulation software is used.
24
![Page 25: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/25.jpg)
Thank you!
25
![Page 26: Motion and responses for deepwater production systems](https://reader030.fdocuments.in/reader030/viewer/2022012701/61a3f3855d3635735b57417b/html5/thumbnails/26.jpg)
COUPLED ANALYSIS APPROACH
• Time domain finite element model (e.g. RIFLEX‐C: SIMO + RIFLEX)
All interaction effects between mooring/risers and vessel are modelled directly
WIND
WAVES
CURRENT