Comparative Analysis of Well Efficiencies Achievable between Mooring and Dynamic Positioning for Deepwater Station Keeping

2016 ◽  
Author(s):  
O.O. (Tayo) Ajimoko
Keyword(s):  
Comparative Analysis ◽  
Dynamic Positioning ◽  
Station Keeping

Development and Validation of a Customizable DP System for a Full Bridge Real Time Simulator

2014 ◽  
Author(s):  
Asdrubal N. Queiroz Filho ◽  
Marcelo Zimbres ◽  
Eduardo A. Tannuri
Keyword(s):  
Real Time ◽  
Complete System ◽  
Dynamic Positioning ◽  
Station Keeping ◽  
Commercial System ◽  
System A ◽  
Important Requirement ◽  
Different Types ◽  
The One ◽  
Development And Validation

This paper presents the development and validation of a customizable Dynamic Positioning (DP) System for a real time full bridge simulator. The Maritime Waterway Simulator (SMH) was developed based on the code of the Numerical Offshore Tank (TPN) simulator. It is able to perform study of maneuvers feasibility and crew training. Many simulated operations such as oil offloading, pipe-laying, support to platforms or station keeping, require a DP system. In order to meet the demand for such a system, a complete system was developed with an important requirement in mind: The DP system of a full bridge simulator must be easily customizable for different types of vessels. In order to validate the developed DP system, a commercial DP system is used for comparison. DP operations with the vessel is conducted with both systems: the in house developed DP and the commercial one. The results obtained with the developed DP system are compared with the one obtained with the commercial system. This comparison demonstrates that the in-house DP system can indeed be used for simulating different types of DP vessels.

Temporary production at Xijiang field with a DP FPSO

2005 ◽  
Author(s):  
Hielke Brugts ◽  
Mireille Soeters ◽  
Max H. Krekel
Keyword(s):  
Dynamic Positioning ◽  
Production Operation ◽  
Station Keeping ◽  
Continue Production ◽  
Dry Dock ◽  
Cost Efficient ◽  
Temporary Production

The paper describes the successful mobilization of the FPSO Munin on the Xijiang field, offshore China, to continue production in the interval that the field’s permanent FPSO was in dry dock for maintenance. The project is unique in that the FPSO Munin relies solely on its Dynamic Positioning (DP) system for station keeping. The paper describes the background to the project and goes into detail on the challenges overcome in order to make it a success. By using the original riser system and by utilizing the FPSO Munin’s DP capability a fast and cost efficient mobilization was achieved that made the project worthwhile for all parties involved. The qualification of the DP system, the offshore installation and the production operation on Xijiang are described in detail. Other applications for DP production are addressed in order to demonstrate the potential of such operations.

Interactions Between Thrusters Attached to a Vessel Hull

2002 ◽  
Author(s):  
L. Elkstrom ◽  
D. T. Brown
Keyword(s):  
Experimental Study ◽  
Experimental Work ◽  
Mechanical Engineering ◽  
Dynamic Positioning ◽  
Station Keeping ◽  
Combined Motion ◽  
Close Proximity ◽  
University College London ◽  
Flow Through ◽  
In Transit

Many offshore vessels are equipped with rotating (azimuthing) thrusters for ease of manoeuvring and dynamic positioning. Accurate prediction of available thrust to resist horizontal environmental forces is important allowing the station-keeping capability of these vessels to be established. Additionally such thrusters are in many cases used, possibly in conjunction with tunnel thrusters and main propeller to provide propulsive power in transit. This paper presents results from a comprehensive experimental study to establish the influence on thruster performance of variations in current inflow velocity, thruster power, and thruster position relative to the hull. Furthermore the influence of two thrusters in close proximity, azimuthing so that flow into one thruster is influenced by the flow through the second thruster, is addressed. The experimental work was carried out using the wave tank and combined motion carriage facility in the Department of Mechanical Engineering at University College London.

Station-Keeping Trials in Ice: Dynamic Positioning in Ice — Results and Learnings

2018 ◽  
Author(s):  
Sofien Kerkeni ◽  
Pavel Liferov ◽  
Nicolas Serré ◽  
Robert Bridges ◽  
Finn Jorgensen
Keyword(s):  
Full Scale ◽  
Control Algorithms ◽  
Dynamic Positioning ◽  
Station Keeping ◽  
Positioning Systems ◽  
Ice Conditions ◽  
Drifting Ice ◽  
External Loads

Dynamic Positioning Systems are used in numerous types of marine operations. Due to the important differences in the external loads acting on the vessel, standard DP systems may fail to perform in ice conditions. Moreover, specific principles and position keeping philosophies should be applied in ice covered waters. The objective of the paper is to elaborate on these aspects by presenting and analyzing full scale DP tests. These tests were a part of the station-keeping trials performed in March 2017 in drifting ice in the Bay of Bothnia. Control algorithms limitations of Standard DP Systems are presented, showing the necessity of new control principles. The importance of crew training is also demonstrated along with the approaches to keep position in ice.

DYPIC - Dynamic Positioning in Ice: Second Phase of Model Testing

2013 ◽  
Author(s):  
Andrea Haase ◽  
Peter Jochmann
Keyword(s):  
Phase I ◽  
Phase Ii ◽  
Development Project ◽  
Model Testing ◽  
Second Phase ◽  
Dynamic Positioning ◽  
Station Keeping ◽  
Level Ice ◽  
Ice Field ◽  
Ice Model

DYPIC - Dynamic Positioning in Ice is a European research and development project where the main goal is to customize a dynamic positioning (DP) system for model testing in an ice model basin. To achieve this objective numerous ice model tests are performed. Overall they are divided into two main phases — DYPIC Phase I in 2011 and DYPIC Phase II in 2012. The first phase is documented and presented in [1]. This paper addresses the description of the second phase and the presentation of a selection of results. As the main goal of Phase II is to test the DP system developed in Phase I the trials of the second phase are mainly performed in DP mode, while very few tests that serve separate sub goals within the project are performed in the so called fixed mode where the model is towed through the tank. For the DP mode different configurations of the test setup itself are tested. In order to simulate station keeping the vessel travels either in front or behind the main carriage trying to hold its position relatively to the carriage. The relative motion is captured by optical cameras on the carriage and markers on the vessel. In addition real station keeping tests are performed while the model stayed in the middle of the ice basin and different ice field types are pushed along. The ice features tested in DYPIC Phase II include managed ice fields of different kinds and level ice.

scholarly journals A Study on the Effectiveness of the Heading Control on the Mooring Line Tension and Position Offset for an Arctic Floating Structure under Complex Environmental Loads

2021 ◽  
Vol 9 (2) ◽  
pp. 102
Author(s):  
Hyun Hwa Kang ◽  
Dae-Soo Lee ◽  
Ji-Su Lim ◽  
Seung Jae Lee ◽  
Jinho Jang ◽  
...  
Keyword(s):  
Standard Procedure ◽  
The Arctic ◽  
Mooring Line ◽  
Dynamic Positioning ◽  
Positioning System ◽  
Station Keeping ◽  
Mooring Lines ◽  
Environmental Loads ◽  
Dynamic Positioning System ◽  
Heading Control

Even though interest in developing the Arctic region is increasing continuously, the standard procedure to be used to analyze the station-keeping performance of a floater considering ice loads has not been established yet. In this paper, the effectiveness of heading control with a dynamic positioning system is analyzed to evaluate the improvement of the performance of the station-keeping system in the ice conditions. Complex environmental loads with ice-induced forces were generated and applied to a ship type floater with dynamic positioning and mooring systems. Three-hour time-domain simulations were conducted for the two different station-keeping systems with mooring only and mooring with a dynamic positioning system. Position offsets and mooring line tensions for the two scenarios were compared with maximum values and most probable maxima (MPM) values. The results of the simulation showed that the heading control can reduce 8.2% of MPM values for the mooring lines and improve the station-keeping performance by about 16.3%. The validity of the station-keeping system that was designed was confirmed, and it is expected that the specification of mooring lines can be relaxed with the heading control.

Station-Keeping Trials in Ice: Test Scenarios

2018 ◽  
Author(s):  
Pavel Liferov ◽  
Nicolas Serre ◽  
Sofien Kerkeni ◽  
Robert Bridges ◽  
Fengwei Guo
Keyword(s):  
Measurement Data ◽  
Dynamic Positioning ◽  
Station Keeping ◽  
Operational Parameters ◽  
Drifting Ice ◽  
Test Scenarios ◽  
Insight Into

Station-keeping trials were undertaken in drifting ice in the Bay of Bothnia with two anchor handling supply vessels; Magne Viking and Tor Viking. This paper describes test scenarios which were performed with Magne Viking in moored, Dynamic Positioning and transit modes. An overview of the tests performed during the trials is presented, outlining the range of environmental and operational parameters. Examples of specific ice interaction scenarios are highlighted with illustrative measurement data providing observational insight into the performance and processes.

Vessel Thruster-Thruster Interactions During Azimuthing Operations

2005 ◽  
Author(s):  
D. T. Brown ◽  
L. Ekstrom
Keyword(s):  
Experimental Study ◽  
Accurate Prediction ◽  
Dynamic Positioning ◽  
Station Keeping ◽  
Inflow Velocity ◽  
Flow Interaction ◽  
Close Proximity ◽  
Flow Through ◽  
In Transit ◽  
Propulsive Power

Flow interaction between thrusters is important, as many offshore vessels are equipped with rotating (azimuthing) thrusters for ease of manoeuvring and dynamic positioning. Accurate prediction of available thrust to resist horizontal environmental forces is essential allowing the realistic station-keeping capability of these vessels to be established. Additionally such thrusters are in many cases used, possibly in conjunction with tunnel thrusters and main propeller to provide propulsive power in transit. This paper presents the influence of two thrusters in close proximity, azimuthing so that flow into one thruster is influenced by the flow through the second thruster. The work extends that previously presented in OMAE 2002, based on a comprehensive experimental study to establish the influence on thruster performance of variations in current inflow velocity, thruster power, and thruster position relative to the hull.

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