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"Bohrinsel"
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Subsea Engineering Handbook
Designing and building structures that will withstand the unique challenges that exist in subsea operations is no easy task. As deepwater wells are drilled to greater depths, engineers are confronted with a new set of problems such as water depth, weather conditions, ocean currents, equipment reliability, and well accessibility, to name just a few. A definitive reference for engineers designing, analyzing and instilling offshore structures, this book provides an expert guide to the key processes, technologies and equipment that comprise contemporary offshore structures. Written in a clear and easy to understand language, the book is based on the authors 30 years of experience in the design, analysis and instillation of offshore structures. This book answers the above mentioned crucial questions as well as covers the entire spectrum of subjects in the discipline, from route selection and planning to design, construction, installation, materials and corrosion, inspection, welding, repair, risk assessment, and applicable design solutions. It yields a roadmap not only for the subsea engineer but also the project managers, estimators and regulatory personnel hoping to gain an appreciation of the overall issues and directed approaches to subsea engineering design solutions.
eBook
Risk Governance of Offshore Oil and Gas Operations
This book evaluates and compares risk regulation and safety management for offshore oil and gas operations in the United States, United Kingdom, Norway and Australia. It provides an interdisciplinary approach with legal, technological and sociological perspectives on efforts to assess and prevent major accidents and improve safety performance. Presented in three parts, it begins with a review of the factors involved in designing, implementing and enforcing a regulatory regime for industrial safety. It then evaluates the four regimes exploring the contextual factors that influence their design and implementation, their reliance on industrial expertise and standards and the use of performance indicators. Finally the book assesses the resilience of the Norwegian regime, its capacity to keep pace with new technologies and emerging risks, respond to near miss incidents, encourage safety culture, incorporate vested rights of labor, and perform inspection and self-audit functions. This book is relevant for those in government, business and academia, and anyone involved in offshore safety issues.
eBook
Ventilation of Controllable Pitch Thrusters
In oil and gas exploration and exploitation, many ships and rigs conduct station-keeping operations by the use of dynamic positioning (DP) systems or thruster-assisted position mooring (PM) systems. Such systems use thrusters to control the ship or rig position and heading. In severe weather conditions, thrusters may experience large and rapid changes in the propeller loading due to ventilation and in and out of water effects. To reduce the negative effects of this undesired dynamic loading on the mechanical components and the electrical power plant, the thruster controllers can locally compensate for the disturbances. To be able to design and verify such controllers, a model of the losses is needed. In this paper, experiments with ventilating controllable pitch propellers are presented. The results are used to develop a ventilation model for use in simulations. The model is verified by comparing simulations with time series from experiments. Scaling laws for ventilating propellers are also discussed.
Journal Article
Current Issues and Technologies for the Reassessment of Existing Offshore Installations
The statutory requirement to prepare safety cases for United Kingdom offshore platforms following the Piper Alpha disaster, the extensive damage to offshore platforms in the Gulf of Mexico caused by Hurricane Andrew and the desire to extend the operational life of hydrocarbon production platforms throughout the world has led to several important industry initiatives concerning requalification and reassessment of offshore platforms.
This paper describes the development of a new industry reassessment guideline document, the philosophy within the guidelines and the technologies available for reassessment. In particular, the availability of validated non-linear system ultimate strength collapse analysis computer software is revolutionizing the reassessment process by being able to take advantage of the system reserve and residual strength above the individual component design capacity level.
However, there are problems in the application of these advanced techniques and there are several generic issues concerning acceptable levels of risk, the scope and methodology of reassessment and the development of international standards for reassessment. The paper draws out these issues and describes industry initiatives that are working towards their resolution.
Journal Article
New rig control system provides closed-loop drilling automation
Continued innovation in modeling and algorithm development has led to new process control for the Cyberbase/SDI drilling command center. Development of the Drilltronics system resulted from collaboration between the International Research Institute of Stavanger AS (IRIS) and National Oilwell Varco (NOV) staff, a \"natural extension\" of 20 years of cooperation, according to Fionn Iversen, research advisor and project leader for Drilltronics development at IRIS. Drilltronics software is built on open standards. There are now hundreds of open connectivity data access servers and clients. IRIS demonstrated the automated control functionality of the Drilltronics system at its Ullrigg Drilling and Well Center in Stavanger in 2006. The experienced rig crew concluded that the new Drilltronics system was \"useful and easy to use.\" The Drilltronics system was also tested passively in the North Sea. The Drilltronics system will be particularly useful in drilling situations that require precise well control, such as managed-pressure drilling, or anywhere it is difficult to remain within pressure limits.
Magazine Article
Refurbished jack up production unit produces marginal field off Malaysia
A refurbished mat-supported jack up mobile oil production unit (MOPU) recently began operating in 63 m of water on the Cendor oil field in Block PM304 off Malaysia. Petrofac Malaysia, a unit of Petrofac Ltd UK, operates the field. Richard Hall, VP of operations and development for Petrofac's resources division and general manager of Petrofac Malaysia, said that one factor that made this low-cost development solution possible for this marginal field was the level seabed at Cendor that allowed installation of the mat-supported MOPU. Hall said that Petrofac had been able to take the Cendor project from \"farm-in to full production in less than 2 years in a tight market, within budget, and ahead of the prescribed timetable.\" Key to Petrofac's development was to obtain operational flexibility for dealing with as many potential reservoir outcomes as possible at the lowest possible cash commitment.
Magazine Article
Remote controlled, hydraulic swing-arm reduces tong handling efforts
A specially designed, hydraulic swing-arm minimizes the effort in maneuvering power-tongs during casing and tubing operations. The swing-arm, developed by BJ Tubular Services for use in British Petroleum's Wytch Farm, has been used on Deutag Tiefbohr GMBH's drilling rig, the T47.
Magazine Article