DP Safety for Offshore Drilling and Well Intervention Vessels

2008 ◽  
Author(s):  
H. Chen ◽  
T. Moan
Keyword(s):  
North Sea ◽  
Barrier Function ◽  
Dynamic Positioning ◽  
Barrier Method ◽  
Offshore Drilling ◽  
The North ◽  
Well Integrity ◽  
The North Sea ◽  
Norwegian Continental Shelf ◽  
Barrier Model

Barrier method is used to model the safety of dynamic positioning (DP) operation for mobile drilling and well intervention vessels. Two barrier functions are identified which are aimed to prevent loss of position and to prevent loss of well integrity given a loss of position, respectively. The first barrier function is analyzed in this paper. Deficiencies are identified based on the DP incidents on the Norwegian Continental Shelf, and recommendations are proposed to strengthen each barrier element which can improve the safety of DP operations for drilling and well intervention vessels working in the North Sea. The barrier model and recommendations are also valid to DP operations on drilling and well intervention vessels worldwide.

The Thirty-Ninth Thomas Lowe Gray Lecture: Offshore Drilling, with Particular Reference to the North Sea and the ‘Sea Quest’

1966 ◽  
Vol 181 (1) ◽  
pp. 848-875 ◽  
Author(s):  
R. G. S. Avery
Keyword(s):  
North Sea ◽  
Essential Factor ◽  
Safety Equipment ◽  
Offshore Drilling ◽  
Advantages And Disadvantages ◽  
The North ◽  
Drilling Equipment ◽  
Sea Bed ◽  
Weight Problems ◽  
The North Sea

The origins of offshore drilling work and the development of structures used at sea are traced. Comparison of the various types illustrates the advantages and disadvantages of each. Tables show the numbers in operation, being built, and the apparent liability of each type to damage. Typical bore-hole structures are illustrated, the need for undersea well-heads explained and their development into a sea-bed completion is discussed. Much more research is necessary before this can be considered a practical proposition. The design of drilling barge equipment is compared with typical land rigs and the development of drilling equipment, including the sophisticated electric drive and turbo-drill, discussed. Rigs in various types of barge are compared. Fire precautions and other safety equipment are described. The problems associated with control by the driller lead to complications of motive power layout. The lecture describes in some detail the design of the semi-submersible drilling barge Sea Quest, illustrates the weight problems and their effect on floating stability and indicates the need for management decisions on the degree of resistance to damage. This is measured by the variable deck load of drilling equipment that can be held on board and the degree of weather deterioration that can be tolerated before disengaging the drill from the hole. The need for, and extent of, diving is discussed, with some comparison between diving vehicles. Weather too is an essential factor of work in the North Sea and both pre-surveys and day-to-day reporting are described.

Wave height variations in the North Sea and on the Norwegian Continental Shelf, 1881–1999

2003 ◽  
Vol 23 (3-4) ◽  
pp. 251-263 ◽  
Author(s):  
Frode Vikebø ◽  
Tore Furevik ◽  
Gunnar Furnes ◽  
Nils Gunnar Kvamstø ◽  
Magnar Reistad
Keyword(s):  
Continental Shelf ◽  
Wave Height ◽  
North Sea ◽  
The North ◽  
The North Sea ◽  
Norwegian Continental Shelf

UNDERWATER BLOWOUT OIL COLLECTION

1977 ◽  
Vol 1977 (1) ◽  
pp. 293-295 ◽  
Author(s):  
Rich H. Westergaard
Keyword(s):  
Feasibility Study ◽  
North Sea ◽  
Oil Spill ◽  
Oil Production ◽  
Offshore Drilling ◽  
The Past ◽  
The North ◽  
The North Sea ◽  
Surface Vessel

ABSTRACT Oil production in the North Sea and some other potentially important areas is much more difficult than offshore drilling was in the past. It is assumed that the difficulties are properly compensated so that blowout probability is not increased. The very much higher productivity of the wells, the expected longer duration of a blowout and the greater difficulties of surface containment obviously increase the probable oil spill volume. Exactly how much it is increased statistically is not known. A factor of 100 is suggested. For this reason, such areas need a much better oil spill defense than used in the past in other areas. The author is engaged in a feasibility study on underwater collection for control of underwater blowouts. The proposed equipment consists of a heavy submersible rig which can place a collection bell over the blowout orifice: the petroleum is then ducted from the bell to a surface vessel where the gas is burned and the oil collected or burned.

scholarly journals Long-term Behavior of CO2 Stored on a Large Scale in the Utsira Formation, the North Sea, Norwegian Continental Shelf

2013 ◽  
Vol 37 ◽  
pp. 5240-5247
Author(s):  
V.T.H. Pham ◽  
E.K. Halland ◽  
I.M. Tappel ◽  
I.T. Gjeldvik ◽  
F. Riis ◽  
...  
Keyword(s):  
Continental Shelf ◽  
North Sea ◽  
Large Scale ◽  
The North ◽  
The North Sea ◽  
Long Term Behavior ◽  
Norwegian Continental Shelf

A Methodology for DP Capability Studies on Remotely Operated Vehicles

2017 ◽  
Author(s):  
Juan A. Ramírez-Macías ◽  
Rafael E. Vásquez ◽  
Asgeir J. Sørensen ◽  
Svein Sævik
Keyword(s):  
North Sea ◽  
Three Dimensional ◽  
Dynamic Positioning ◽  
Remotely Operated Vehicles ◽  
Environmental Loads ◽  
The North ◽  
Surface Vessels ◽  
The North Sea ◽  
Position And Orientation ◽  
Surface Vessel

Dynamic Positioning (DP) capability studies are used to assess if a vessel has sufficient thrust capacity to withstand environmental loads while keeping its position and orientation at a specified set-point or path. These studies are usually performed on ships and other DP-controlled surface vessels; consequently, standards and procedures for these are widely known. In this work, a methodology for conducting a DP capability study for Remotely Operated Vehicles (ROV) is presented. Due to the nature of ROV operations, a DP capability study should include different features that are not common to surface vessels. In this case, an ROV connected to a surface vessel through a tether is considered. During operation, the tether is subject to varying current loads that are accumulated along the water column and transferred to the vehicle. Therefore, the ROVs thrusters must be able to withstand, in addition to its own drag, three-dimensional loads due to three-dimensional currents and umbilical-related loads. To illustrate the methodology, two case studies are considered: the DP capability of an ROV that has to operate in the Colombian Caribbean and an existing ROV operating in the North Sea.

scholarly journals Advanced Intelligent Control Strategy in Dynamic Positioning (DP) System Applied to a Semi-Submersible Drilling Platform in the North Sea

2021 ◽  
Author(s):  
Mohamad Alremeihi ◽  
Rosemary Norman ◽  
Kayvan Pazouki ◽  
Arun Dev ◽  
Musa Bashir
Keyword(s):  
North Sea ◽  
Oil And Gas ◽  
Weather Conditions ◽  
Dynamic Positioning ◽  
Gas Drilling ◽  
The North ◽  
Drilling Operations ◽  
The North Sea ◽  
And Performance ◽  
Wind Currents

Abstract Dynamic Positioning (DP) systems play a crucial role in oil and gas drilling and production floaters used globally for deep-water operations. Drilling operations need to maintain automatic positioning of the platform in the horizontal-plane within the safe zone. Operating DP systems typically require highly responsive control systems when encountering prevailing weather conditions. However, DP incident analysis demonstrates that control and thruster failures have been the leading causes of accidents for the past two decades, according to the International Marine Contractors Association (IMCA). In this paper, a Predictive Neural Network (PNN) strategy is proposed for thruster allocation on a platform; it has been developed by predicting the platform response and training the network to transform the required force commands from a nonlinear Proportional Integral Derivative (PID) motion controller for each thruster. The strategy is developed for increasing safety and zone keeping of DP-assisted-drilling operations in harsh weather. This is done by allowing the platform to recover the position more rapidly whilst decreasing the risk of losing the platform position and heading, which can lead to catastrophic damage. The operational performance of the DP system on a drilling platform subjected to the North Sea real environmental conditions of wind, currents and waves, is simulated with the model incorporating the PNN control algorithm, which deals with dynamic uncertainties, into the unstable conventional PID control system for a current drilling semi-submersible model. The simulation results demonstrate the improvement in DP accuracy and robustness for the semi-submersible drilling platform positioning and performance using the PNN strategy.

Effect of DGPS failures on dynamic positioning of mobile drilling units in the North Sea

2009 ◽  
Vol 41 (6) ◽  
pp. 1164-1171 ◽  
Author(s):  
Haibo Chen ◽  
Torgeir Moan ◽  
Harry Verhoeven
Keyword(s):  
North Sea ◽  
Dynamic Positioning ◽  
The North ◽  
The North Sea
Sign in / Sign up

Export Citation Format

Share Document