scholarly journals HLW Flexible jumper materials compatibility evaluation

2017 ◽  
Author(s):  
T. E. Skidmore
Keyword(s):  
Flexible Jumper

Design Drivers of Hybrid Riser Towers

2005 ◽  
Author(s):  
Franc¸ois Thie´baud ◽  
Ste´phane Luteyn ◽  
Dominique Pe´rinet
Keyword(s):  
Gulf Of Mexico ◽  
Cross Section ◽  
Loop Current ◽  
Distant Future ◽  
Flexible Pipes ◽  
Steel Catenary Risers ◽  
Key Drivers ◽  
Northern North Sea ◽  
Flexible Jumper ◽  
The Impact

DORIS Engineering and Stolt Offshore have jointly designed the three Girassol hybrid riser towers installed offshore Angola. They were the first riser towers designed to provide very efficient insulation properties in very deepwater conditions. Some towers are under development or construction for other fields but in similar design conditions. Based on the experience of Girassol, DORIS engineering and Stolt Offshore have developed the concept to adapt to much deeper waters (around 2500 m) and more severe environments such as the Gulf of Mexico loop current or hurricane waves. This paper will present the key drivers for design of riser towers in these environments addressing for example the impact on the bundle cross section, buoyancy requirements, top tank size, flexible jumper lengths. Limitations will be defined and explained both in terms of design, fabrication and installation. As FPSO units are likely to be part of the development of the Gulf of Mexico deepwater areas in the not-so-distant future, the benefit of riser towers will become obvious, given the existing facilities for fabrication along the coast and spreads for installation. Other areas such as the Mediterranean sea, or even the Northern North Sea are potential candidates for this type of riser arrangement which provides multiple benefits over steel catenary risers and flexible pipes.

A New Top Connection System for Steel Catenary Risers

2009 ◽  
Author(s):  
Claudio Marcio Silva Dantas ◽  
Jose´ Renato Mendes de Sousa ◽  
Fernando Jorge Mendes de Sousa ◽  
Marcos Queija de Siqueira ◽  
Isai´as Quaresma Masetti
Keyword(s):  
Fatigue Life ◽  
Line Segment ◽  
Mooring Line ◽  
Bending Moments ◽  
Connection System ◽  
Steel Catenary Risers ◽  
Flexible Jumper ◽  
Maximum Stresses ◽  
New System

PETROBRAS has been developing several studies in order to verify the structural feasibility of SCRs connected to production units such as FPSOs, semi-submersible and monocolumn platforms. Due to the great stresses developed at the top region as a consequence of the platforms rotation movements, robust stress joints or flex joints are always required to connect the SCRs to the platforms. However, those components may add high costs to any project, mainly where titanium is required. In attempt to avoid this fact, the objective of this work is to present a new top connection system called “Suspender”. This system is composed by the SCR, a mooring line segment, a flexible jumper and a “Y” shaped steel connector, and has the advantage of reducing the transmission of bending moments from the platform to the SCR. The performance of this alternative was compared to a more conventional one, composed by a SCR and a flex joint, and the obtained results indicate that this new system reduces the maximum stresses at the top region without changing the SCR behavior at the TDZ. It is also possible to extend the fatigue life by changing the SCR configuration.

Singing Mitigation in an Export Riser via Liquid Injection: A Field Case Study

2014 ◽  
Author(s):  
S. P. C. Belfroid ◽  
H. J. C. Korst ◽  
P. van Beek ◽  
K. Lunde ◽  
I. G. Eidsvik ◽  
...  
Keyword(s):  
Gas Flow ◽  
Field Measurements ◽  
High Amplitude ◽  
Injection Rate ◽  
Norwegian Sea ◽  
Liquid Injection ◽  
Flexible Jumper ◽  
Continuous Injection ◽  
Gas Lift

Flexible Risers are prone to the generation of high amplitude tonal noise, i.e. a so-called singing riser. Recently, severe vibrations and high noise levels were encountered on the turret of an FPSO in the Norwegian Sea, resulting in significantly reduced production. The vibrations could be attributed to pulsations generated either by a flexible jumper (connecting topside to turret), the gas lift riser or the gas export riser. Field measurements showed that the most likely source was the 10 inch gas export riser. Due to the vibrations, a reduced production limit was set. A field measurement campaign was started to inject liquid into the export risers to provisionally increase production, while in the meantime permanent solutions were evaluated and installed. Liquid was injected batch wise and continuously. The main field trial was initiated by a batch of MEG (mono ethylene glycol) (2 times 500 liters) followed by continuous injection of small amounts of MEG. Between settling periods, the gas export rate was increased in steps until vibrations were detected. At detection, the MEG injection rate was increased until vibrations/pulsations disappeared, after which gas export was increased again. This process was repeated to maximum gas flow rate, after which the liquid injection and gas export were similarly stepwise decreased. During this test, the gas export could be increased tenfold with moderate liquid injection rates (up to a maximum of 25 l/hr). Similar tests were done with TEG as injected fluid. However, TEG was far less efficient in suppressing the singing. This is attributed to the higher viscosity of the TEG at the injection temperatures and the method of injection.

Dynamic Behavior Analysis of a Deepwater Self Standing Hybrid Riser System

2012 ◽  
Author(s):  
Celso K. Morooka ◽  
Denis A. Shiguemoto
Keyword(s):  
Dynamic Behavior ◽  
Maximum Amplitude ◽  
Ocean Waves ◽  
Numerical Approach ◽  
Sea Surface ◽  
Hydrodynamic Drag ◽  
Floating Platform ◽  
Riser Pipe ◽  
Sea Bottom ◽  
Flexible Jumper

Self Standing Hybrid Riser (SSHR) system is an attractive option for deepwater application. The system is composed by a vertical riser pipe coming from the sea bottom to a subsurface buoy which is placed in around one hundred meter water depth from the sea surface. It is connected to a floating production facility at the sea surface by a flexible jumper. It almost eliminates all the undesired dynamic effects from ocean waves, in addition to relief the total riser system weight from the floating platform. Recent discoveries of petroleum in ultra-deep water Pre-salt Offshore Brazil stimulated development of innovative and nontraditional riser system configurations. The present work deals with the dynamic behavior of a SSHR system excited by sea current, waves and displacements induced by sea surface platform motions. In plane and out of plane displacements for the SSHR system is analyzed and subsurface buoy maximum motions amplitude have been observed. Effects from current drag and vortex induced forces are investigated by numerical simulations of the dynamic behavior of the SSHR system. Analysis procedure is presented with details, and fundamentals of the semi-empirical approach for hydrodynamic drag and vortex induced forces in the riser length and subsurface buoy are described. Numerical simulation results are presented, and evaluations are conducted for deepwater condition. Maximum amplitude of vibration is observed near from to lock-in conditions, and effects of the subsurface buoy vortex induced motion (VIM) are discussed. Hydrodynamic forces previously obtained from reduced model tests are used for the numerical approach.

Line Type Optimization of the Flexible Jumper for New Generation Subsea Suspended Manifold Production System

2021 ◽  
Author(s):  
Yingying Wang ◽  
Weizheng An ◽  
Zhigang Li ◽  
Wentao luo ◽  
Menglan Duan
Keyword(s):  
Production System ◽  
Flexible Jumper ◽  
New Generation ◽  
Line Type

Line Type Optimization of the Flexible Jumper for New Generation Subsea Suspended Manifold Production System

2021 ◽  
Author(s):  
Yingying Wang ◽  
Weizheng An ◽  
Zhigang Li ◽  
Wentao luo ◽  
Menglan Duan
Keyword(s):  
Production System ◽  
Flexible Jumper ◽  
New Generation ◽  
Line Type

Three-Dimensional Mechanical Analysis of Flexible Jumper Installation

2015 ◽  
Author(s):  
Weidong Ruan ◽  
Ting Liu ◽  
Yong Bai ◽  
You Shi ◽  
Jianbo Fu ◽  
...  
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Internal Force ◽  
Mechanical Analysis ◽  
Convergence Criteria ◽  
Bend Radius ◽  
Simple Method ◽  
Element Discretization ◽  
Flexible Jumper

This paper presents a simple method to study the installation process of a flexible jumper lowered into deep water by use of cables in a 3D space. Based on the catenary theory, the initial configuration of the installation system can be obtained easily. Then an iterative procedure, which uses force equilibrium and compatibility requirements as convergence criteria, is adopted to establish the final configuration considering the environmental loads. The internal force, bend radius and displacement of the flexible jumper are also obtained by finite-element discretization. The acquired results are compared with those derived from OrcaFlex finite-element model, in order to verify the accuracy and reliability of the proposed method. The influence on the minimum bend radius and maximum axial tension of the flexible jumper due to the difference between the lowering cable lengths, is also studied. The approach presented throughout this paper can offer some suggestions in regards to the installation of a flexible jumper in practical engineering.

Offshore Monitoring of Snorre A TLP TTR Jumpers

2015 ◽  
Author(s):  
Phelim Rooney ◽  
Christoffer Nilsen-Aas ◽  
Haavard Skjerve ◽  
Kristin Nedrelid ◽  
Nils Gunnar Viko
Keyword(s):  
Data Base ◽  
Significant Wave Height ◽  
Environmental Data ◽  
Life Extension ◽  
Data Sets ◽  
Analysis Model ◽  
Peak Period ◽  
Wave Measurement ◽  
Motion Responses ◽  
Flexible Jumper

Four sensors were installed on the Snorre A TLP (Tension Leg Platform) on 16th April 2014 and retrieved on 10th May 2014, to document motions of the vessel, top tensioned riser (TTR) and flexible jumper connecting the TTR (Top Tensioned Riser) with the topside piping. The data recorded represents 3828 data sets. Associated significant wave height and peak period is synchronous data extracted from the Miros wave measurement radar and stored in the environmental data base. The SmartMotion riser sensors are certified for service in the Wellbay. The sensors are modelled into the OrcaFlex (1) “calibration” analysis model in order to simulate the motion responses in the same format as recorded offshore (accelerations and rates of rotation), and to carry out verification of the OrcaFlex model by comparing both raw data and filtered/integrated derivatives. This work provides a basis for life extension of the Jumpers and provides valuable feedback to design and analysis of TLP and Spar Jumpers between TTRs and topside Headers.

Free Standing Risers for Extended Ultra Deepwater Tests

2004 ◽  
Author(s):  
Roberto Rodrigues ◽  
Renato Branda˜o Mansano ◽  
Cesar Del Luchesse Junior ◽  
Francisco Edward Roveri ◽  
Mauricio Barbosa
Keyword(s):  
Production System ◽  
Net Present Value ◽  
Drill Pipe ◽  
Christmas Tree ◽  
Production Flow ◽  
Free Standing ◽  
Sea Bed ◽  
Implementation Costs ◽  
Early Production ◽  
Flexible Jumper

Petrobras presently has a significant part of its reserves located in deep and ultra deep waters. To produce this oil economically Petrobras created the well-known research program PROCAP 3000. This paper presents one project being developed under such program, the Extended Test for Deep and Ultra Deepwater. Petrobras has been using early production system and extended test for some years. Since 1998 Petrobras has been testing wells (extended test) with the Seillean FPSO (Floating Production Storage and Offloading). One challenge in this concept is the use of a dynamically positioned (DP) tanker with a rig and a threaded pipe (drill pipe riser) to produce and test wells in deep and ultra deep water. Another challenge is the frequency of changes of location of the FPSO, since the objective of an extended test is to produce for periods of three to twelve months. Therefore the system must have enough flexibility to make the installation and recovery easier. The proposed Itinerant Production and Evaluation Pilot System concept is easy to deploy and demobilize for extended trials. Under certain circumstances, it may even work as an Early Production System. It consists of a free-standing drill pipe riser system connected directly to the Christmas tree at the sea bed and to an air can at the top, which is located around 100 metes below sea surface. A flexible jumper links the air can to an FPSO. To improve production flow rate, an electric submersible pump (ESP) is installed at either downhole or at the top of Christmas tree. The main purpose of the extended test is to collect data, enhancing knowledge of the reservoir through more reliable information. Although attempting to minimize implementation costs, it may present a negative Net Present Value for shorter periods, especially if the value of the information obtained is not included in the calculation. Most of these ideas and concepts are still under study, and some of them will certainly be reassessed, reviewed and possibly improved. Petrobras has been working with some partner companies to develop the conceptual study and assess the system feasibility. This paper presents the main issues involved in this project. The objective of this paper is to summarize a preliminary conceptual design to conduct a feasibility analysis for Petrobras’ Free Standing Drill Pipe Riser (FSDPR).

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