Station Keeping In Deep Water: An Alternative To Dynamic Positioning

1988 ◽  
Author(s):  
C.V. Wolff ◽  
C.J. Lohr ◽  
D.J. Wudtke
Keyword(s):  
Deep Water ◽  
Dynamic Positioning ◽  
Station Keeping

Time-Domain Dynamic Analysis for Dynamic Positioning System of Deepwater Semi-Submersible

2012 ◽  
Vol 204-208 ◽  
pp. 4518-4522 ◽  
Author(s):  
Li Ping Sun ◽  
Shu Long Cai ◽  
Jing Chen
Keyword(s):  
Dynamic Analysis ◽  
Deep Water ◽  
Time Domain ◽  
Pid Control ◽  
Oil And Gas ◽  
Dynamic Positioning ◽  
Positioning System ◽  
Dynamic Positioning System ◽  
The Time Domain ◽  
Thrust Allocation

Semi-submersible plays an important role in ocean oil and gas exploitation. This paper carried out some researches for the dynamic positioning system (DPS) of a deep water semi- submersible. Mathematic modal was made, and a special program was created with M-language for the time-domain dynamic analysis of the dynamic positioning system of the deep water semi-submersible, on basis of the mathematic modal. PID control strategy, kalman filtering theory and optimal thrust allocation method were used in the analysis. Simulation result indicated the DPS of this platform is safe and efficient.

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.

Dynamic Behavior of a Semi-Submersible Platform Coupled With Drilling Riser During Re-Entry Operation in Ultra-Deep Water

2007 ◽  
Author(s):  
Marcio Yamamoto ◽  
Celso K. Morooka ◽  
Seiya Ueno
Keyword(s):  
Deep Water ◽  
Time Domain ◽  
Model Simulation ◽  
Dynamic Positioning ◽  
Positioning System ◽  
Dynamic Positioning System ◽  
Deep Waters ◽  
Operational Costs ◽  
Simulation Results ◽  
Platform Motions

The present study deals with the dynamics of a semi-submersible platform coupled with a free-hanging vertical rigid riser during the re-entry operation in ultra-deep water. The reentry operation occurs after the drilling phases are accomplished which only use the bare drillstring. The re-entry operation entails positioning the subsurface Blow-Out-Preventer (BOP) above the wellhead and installing it to the wellhead. During this operation, the BOP is suspended by the drilling riser. The placement and installation is time consuming and requires a great amount of accuracy. One challenge is the effects of platform motions on the installation procedure. The present work was carried out with the aim to understand the influence of platform motions during the re-entry operation in ultra-deep waters. Another benefit of this study is the knowledge of the effect of platform motions on the drilling riser and BOP which leads to the possibility of drilling more than one well without the need to raise the BOP to the surface. This could greatly reduce the amount of time needed to drill subsurface wells which in turn, reduces overall operational costs. A numerical simulation in time domain has been carried out using a non-linear model for the platform dynamics. The dynamics of a free hanging drilling riser and a dynamic positioning system (DPS) of the semi-submersible platform are included in the numerical model. Simulation results in time domain of the platform displacements with DPS and riser displacement are shown. A discussion of riser displacement and DPS control is also included.

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.

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