On-Board Monitoring, Analysis and Decision Support During Offshore Pipe Lay Operation

2011 ◽  
Author(s):  
Joakim Taby ◽  
Ole David O̸kland ◽  
Egil Giertsen ◽  
Naiquan Ye ◽  
Melvyn Morgan ◽  
...  
Keyword(s):  
Field Tests ◽  
Lateral Stability ◽  
Current Profile ◽  
Tension Development ◽  
Additional Information ◽  
The North ◽  
Board Monitoring ◽  
The North Sea ◽  
Gps System ◽  
And Storage

For pipe lay operations parameters like heading and position of the lay vessel are available from the GPS system on the vessel. In some cases the current profile may also be monitored. Provided that a fast and robust numerical tool is available and can be integrated with the on-board system, the above parameters and a measure of tension in the pipe will be sufficient to simulate the appurtenant static configuration of the catenary and visualize it online during the lay operation. Such a system will provide valuable additional information such as: catenary shape including stresses in the pipe, lay tension, development of free spans, and lateral stability during installation. In the period April-August 2009 two field tests of the developed system were performed. Both field tests were related to Acergy installation campaigns for the Ormen Lange Phase II development in the North Sea; 1) ∼13 km infield MEG (IMEGDA) installation by Acergy Falcon, and 2) ∼13km infield umbilical (IUMB-DA) installation by Acergy Eagle (both at ∼860m water depth). In this paper the experiences from the field tests are discussed. This includes assessment of on-board data collection and storage of key parameters during installation, real-time online 3D finite element (FE) analysis and satellite link to shore for support during installation. The accuracy of the results obtained in the on-board monitoring system is assessed by comparison to available as-laid survey information.

DISPERSANT EFFECTIVENESS IN FIELD TRIALS AND IN OPERATIONAL RESPONSE

1997 ◽  
Vol 1997 (1) ◽  
pp. 923-923
Author(s):  
Tim Lunel ◽  
Peter Wood ◽  
Louise Davies
Keyword(s):  
North Sea ◽  
Quantitative Data ◽  
Field Tests ◽  
Field Trials ◽  
Data Set ◽  
Oil Droplet ◽  
The North ◽  
The North Sea ◽  
Dispersant Effectiveness ◽  
Oil Droplet Size

ABSTRACT The North Sea field tests described in the paper have provided a quantitative data set on dispersant efficiency that can be used to calibrate laboratory dispersant tests. Comparisons of efficiency figures from the EXDET, IFP, Swirling Flask, and WSL tests with the field dispersant efficiency figures indicate that the WSL test comes closest to replicating the observed dispersion, in terms of both the percentage of oil dispersed and the oil droplet size of the dispersion. This paper, with the accompanying presentation in the Sea Empress session of the conference, demonstrates that a combination of quantitative field tests and the WSL test can be used to guide responders in decisions of whether to use dispersants in response to an oil spill. The WSL test and the field trials indicated that dispersants were likely to be effective against both the Forties Blend crude oil and the weathered oil. These predictions were confirmed by the successful dispersant operation at the Sea Empress incident.

Risk Assessment of Production and Storage Tankers

1996 ◽  
Vol 118 (3) ◽  
pp. 198-203
Author(s):  
J. E. Vinnem ◽  
S. Haugen ◽  
R. Bo̸rresen
Keyword(s):  
Oil And Gas ◽  
Feasible Solution ◽  
System Protection ◽  
The North ◽  
Oil And Gas Fields ◽  
The North Sea ◽  
Safety Features ◽  
Favorable Safety ◽  
Gas Fields ◽  
And Storage

Production and storage tankers are being evaluated extensively for development of marginal oil and gas fields in the North Sea. The main safety aspects of these vessels are discussed, based on a number of quantitative risk assessments for these vessel concepts. These studies have confirmed the importance of several important safety features, such as a fire-protected, enclosed escape way along one of the sides of the ship. Other important safety features include weather-vaning capability as a function of the turret location, location and configuration of the flare system, protection of cargo tanks by inert gas blanketing, as well as procedures for strict control of tank intervention. The results, show that the production and storage vessels have favorable safety characteristics, and that these concepts represent an acceptable and feasible solution for the marginal fields.

A Concept Design and Hydrodynamic Behavior of a Spar Platform

2003 ◽  
Author(s):  
Marcio de Abreu Grove ◽  
Carlos Antonio Levi da Conceic¸a˜o ◽  
Richard David Schachter
Keyword(s):  
Design Method ◽  
Low Frequency ◽  
Vertical Motion ◽  
Concept Design ◽  
Hydrodynamic Behavior ◽  
Spar Platform ◽  
The North ◽  
Campos Basin ◽  
The North Sea ◽  
And Storage

This paper presents a study of a Production and Storage Spar Platform concept design for operations in deep water, under the environmental conditions of the Campos Basin, Brazil. This study is the result of a research sponsored by Ageˆncia Nacional do Petro´leo – ANP. The theme was chosen due the good results obtained by this kind of platform in the North Sea and the Gulf of Mexico. Since the exploration of hydrocarbonets is moving to deeper waters, where the Spar concept seems to be one of the best options for the task, due to its simplicity in construction and operation. Although it looks simple, this work had required perceptive studies, and the best way chosen to carry it out, was dividing it in two directions: one dealing with the design method and naval architecture aspects and other with its hydrodynamic behavior. The first line took into consideration the hull generation, compartmentation, weight distribution and stability. A design methodology is presented and the interaction of these factors are showed, taking into account the hydrodynamic results. The second line has favored the evaluation and the control of the vertical motion, excited by dominant waves from the spectra of energy of the sea, and the horizontal motions due the low frequency excitations, and its interaction with the mooring system.

Classification, Treatment and Storage of Low Specific Activity Radioactive Waste From the Petroleum Industry

2001 ◽  
Author(s):  
Tore Ramsøy ◽  
Elisabeth Strålberg ◽  
Per Varskog
Keyword(s):  
Specific Activity ◽  
Petroleum Industry ◽  
Site Classification ◽  
Activity Levels ◽  
Simple Method ◽  
The North ◽  
The North Sea ◽  
Free Classification ◽  
And Storage

Abstract Low specific activity deposits containing 226Ra, 228Ra and their daughter isotopes is a well-known problem in the petroleum industry. It is estimated that installations in the Norwegian sector of the North Sea will generate from 50 to 75 tons of scale and sludge annually. A simple method for on-site classification of LSA scale has been developed. Classification of the sludge from the Brent Spar revealed that only a small fraction of the total amount of sludge exceeded the exemption level. Sludge classified to be below the free classification limit was incinerated with surveillance of activity levels in the ash and effluents.

scholarly journals Continuous measurements of atmospheric oxygen and carbon dioxide on a North Sea gas platform

2009 ◽  
Vol 2 (4) ◽  
pp. 1693-1724 ◽  
Author(s):  
I. T. Luijkx ◽  
R. E. M. Neubert ◽  
S. van der Laan ◽  
H. A. J. Meijer
Keyword(s):  
North Sea ◽  
Oil And Gas ◽  
Atmospheric Oxygen ◽  
Gas Production ◽  
Co2 Uptake ◽  
Data Set ◽  
Additional Information ◽  
Mixing Ratios ◽  
The North ◽  
The North Sea

Abstract. A new atmospheric measurement station has been established on the North Sea oil and gas production platform F3, 200 km north off the Dutch coast (54°51' N, 4°44' E). Atmospheric mixing ratios of O2 and CO2 are continuously measured using fuel cell technology and compact infrared absorption instruments, respectively. Furthermore, the station includes an automated air flask sampler for laboratory analysis of the atmospheric mixing ratios of CO2, CH4, CO and O2 and isotope measurements of δ13C, δ18O and Δ14C from CO2. This station is – to our knowledge – the first fixed sea based station with on-site continuous O2 and CO2 measurements and therefore yields valuable additional information about the CO2 uptake in coastal marine regions, specifically the North Sea. This paper presents the measurement station and the used methodologies in detail. Additionally, the first data is presented showing the seasonal cycle as expected during August 2008 through June 2009. In comparison to land-based stations, the data show low day-to-day variability, as they are practically free of nightly inversions. Therefore, the data set collected at this measurement station serves directly as background data for the coastal northwest European region. Additionally, some short-term O2 and CO2 signals are presented, including very large (over 200 per meg) and fast negative atmospheric O2 excursions.

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