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.

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.

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.

Velocity anisotropy of shales and depth estimation in the North Sea basin

Geophysics ◽  
1984 ◽  
Vol 49 (9) ◽  
pp. 1411-1419 ◽  
Author(s):  
N. C. Banik
Keyword(s):  
North Sea ◽  
Seismic Data ◽  
Depth Estimation ◽  
Data Sets ◽  
Well Log ◽  
Simple Method ◽  
Velocity Anisotropy ◽  
Interval Velocity ◽  
The North ◽  
The North Sea

It is known that in the North Sea basin the depths to major reflectors as determined from surface seismic data are often larger than the well‐log depths. From a study of data sets which tie 21 wells, I found a strong correlation between the occurrence of the depth error and the presence of shales in the subsurface. Assuming that the error is caused by elliptical velocity anisotropy in shales, I measured the anisotropy from a comparison of the well‐log sonic data and the interval velocity profile obtained from the surface seismic data and also from a comparison of the seismic depth and the well‐log depth. It was found that the two methods of measurements agree with each other and also agree qualitatively with the previous laboratory measurements of anisotropy in shale samples. The results strongly suggest that the depth anomaly in the North Sea basin is caused by the velocity anisotropy of shales. A simple method to correct the seismic depth is given.

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.

NORSOK L-005 — Compact Flanged Connections (CFC): The New Flange Standard

2002 ◽  
Author(s):  
Sjur Lassesen ◽  
Tor Eriksen ◽  
Finn Teller
Keyword(s):  
North Sea ◽  
Field Experience ◽  
Petroleum Industry ◽  
Valve Design ◽  
Operational Conditions ◽  
Oil Companies ◽  
Design Standard ◽  
The North ◽  
The North Sea ◽  
The Right

The SPO Compact Flange System (SPO CFS) has for more than 10 years proven its ability to fulfil the most severe operational conditions in the North Sea. In view of the good experiences and desire for a wider market application for Compact Flanged Connections (CFC), an agreement for the right to use the patented SPO compact flange was negotiated between SPO and the two Norwegian oil companies, Statoil and Norsk Hydro, in 2001. The agreement also includes the right to establish a Norwegian petroleum industry NORSOK standard for CFC where the dimensional standard is based on the SPO compact flange design. The fact that this compact flange system fully comply with ASME codes and standards, also the ASME B 16.34 valve design standard, may create a significant market for this new standard. This paper describes the new NORSOK standard, which is expected to be published in 2002, and it outlines the advantages of the CFC and the field experience so far.

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