Risk Indicators for Major Accidents on Load Bearing Structures and Maritime Systems in the Petroleum Industry

2008 ◽  
Author(s):  
Arne Kvitrud ◽  
Gerhard Ersdal ◽  
Jan-Erik Vinnem
Keyword(s):  
Continental Shelf ◽  
Petroleum Industry ◽  
Risk Indicators ◽  
Risk Level ◽  
Risk Indicator ◽  
Total Risk ◽  
Load Bearing ◽  
Fatality Risk ◽  
Norwegian Continental Shelf

To monitor the development of the risk of major accidents of structures and maritime systems on the Norwegian Continental Shelf a set of incident indicators has been established. These indicators are given a weight related to the fatality risk predictions in order to develop a total risk indicator. Aggregated and weighted indicators as well as individual indicators are presented and evaluated. In addition indicators related to barriers are established giving a method to monitor the performance as a function of time, and to benchmark the participants in the industry. The present paper describes the method used in the risk level project to monitor the risk related with emphasis on structures and maritime systems, including hazards as wave in deck, vessel collisions and cracks on the structures. The paper further presents the actual development using the methodology, and the identified major contributors to the risk level.

Pipeline Regulations in the Norwegian Petroleum Industry: Experiences, Follow-Up and Statistical Summaries of Incidents

2017 ◽  
Author(s):  
Trond Sundby ◽  
Kjell Arild Anfinsen
Keyword(s):  
Continental Shelf ◽  
Emergency Preparedness ◽  
Petroleum Industry ◽  
Working Environment ◽  
Risk Level ◽  
Major Incidents ◽  
Flexible Risers ◽  
Degrees Of Severity ◽  
Norwegian Continental Shelf

The Petroleum Safety Authority Norway (PSA) is an independent government regulator responsible for safety, emergency preparedness and the working environment in the Norwegian petroleum industry. Norway’s regulations for petroleum operations offshore and on land are risk-based, and give great emphasis to principles for reducing health, safety and environmental (HSE) risk. They have been developed over more than 40 years, changing from detailed prescriptive regulations in the early days to the present requirements, which are largely formulated in performance-based (functional) terms. They specify requirements for the various aspects, characteristics or qualities which a product, process or service must possess. In our regulations there are requirements for reporting incidents and specifically to report on damages to load-bearing structures and pipeline systems. About 2900 incidents with risers and pipelines were reported on the Norwegian Continental Shelf (NCS) from 1975 to January 2017. Of these, 2/3 related to pipelines and 1/3 to risers, and they were of varying degrees of severity. The incidents with highest risk for personnel concerned risers and more than 80 reported major incidents involving flexible risers occurred in the period from 2000–2016. This paper will briefly summarise the development of the regulations and give examples from the pipeline regulations and the way the PSA follows up the industry today. We will also present statistical data of incidents related to risers. Since the start of the trends in risk level project (RNNP) on the Norwegian Continental Shelf (NCS) in 1999–2000 there has been 84 reported riser incidents (classified as major in the PSA RNNP-project) where most of those incidents are related to flexibles. There has been no major accident related to risers on the NCS in the same period and very few leaks. 8 of 11 reported leaks for pipelines and risers within the safety zone has been from flexible risers, with relatively low leak rates.

Improving Oil Spill Response capability during times of downsizing and budget cuts: A glance at the Norwegian way

2017 ◽  
Vol 2017 (1) ◽  
pp. 2726-2742
Author(s):  
Ståle Jensen
Keyword(s):  
Continental Shelf ◽  
Oil Spill ◽  
Emergency Preparedness ◽  
Large Scale ◽  
Petroleum Industry ◽  
Strategic Choices ◽  
Budget Cuts ◽  
Incident Command ◽  
Oil Spill Response ◽  
Norwegian Continental Shelf

ABSTRACT How can we continuously develop and improve large scale emergency preparedness, such as oil spill response, in times of low oil prices, budget cuts and downsizing? NOFO (Norwegian Clean Seas Association For Operating Companies) has found its path, through modernization and cooperation. When there are spills of crude oil from the petroleum industry at the Norwegian Continental Shelf (NCS) NOFO will perform the oil spill response (OSR) on behalf of the owner of the spill, in practical terms becoming the company’s OSR branch during the incident. NOFO was founded in 1978, as a response to the large blowout at the Bravo field the previous year. Focus on offshore OSR technology and combat strategies has been the main motivation during our almost 40 year’s existence. The last decade has included a significant improvement in our competence and training on near-shore and beach OSR, simultaneously maintaining the unique offshore segment. As part of improving NOFO capacity within large scale, and / or long duration spill situations (e.g. Macondo), NOFO have embraced and implemented ICS (Incident Command System), thus improving our capabilities and capacities through the whole range from offshore to shoreline OSR. Through 2015 and 2016 ICS training and ICS adaptions of previous organizational systems has been prioritized, and new ones have been developed. NOFO personnel have participated in numerous training sessions and exercises with our member companies (operators on the Norwegian continental shelf) nationally and internationally. Through strategic choices of planning and collaboration both internally in NOFO and between NOFO and the Norwegian Coastal Administration (NCA), Global Response Network (GRN), other oil spill Response Organizations (OSROs) and cooperating partners, the number of exercises has increased, the value and output of exercises is improved, and thus the capacity and capability of NOFOs whole range OSR in improved. At the same time, on behalf of our members, NOFO have consumed less money year after year. NOFO is developing and improving our proven OSR capacity and competence, from offshore to shoreline, through increased efficiency, high focus on exercise training, and cooperation with other OSR agencies.

scholarly journals Computational method for risk assessment of regional socio-economic development

2021 ◽  
Vol 107 ◽  
pp. 10001
Author(s):  
Oleg Pursky ◽  
Tatiana Dubovyk ◽  
Iryna Buchatska ◽  
Iryna Lutsenko ◽  
Hanna Danylchuk
Keyword(s):  
Risk Assessment ◽  
Economic Development ◽  
Computational Method ◽  
Risk Indicators ◽  
Risk Level ◽  
General Situation ◽  
Risk Indicator ◽  
Expert Evaluation ◽  
Socio Economic Development

In this study, we present the computational method for risk assessment of the socio-economic development of regions. An attempt has been made to develop a method for the determination of integral risk indicators of socio-economic development based on the joint use of the methods of factor analysis and expert evaluation. This approach has increased the reliability of the calculations and made it possible to analyze the influence of socio-economic indicators on the risk level of socio-economic development. The integral risk indicator shows the effect of the inconsistency in the level of factor provision on the socio-economic development of the j-th region (district) in comparison with the general situation in the country (regions). The closer the value of integral risk indicator is to 1, the higher the level of risk in this region. Using Kyiv region districts as an example, the process of risk assessment for regional socio-economic development has been considered. The results obtained in this investigation demonstrate that the presented computational method solves the problem of formalization of risk assessment for the socio-economic development of regions.

Protection of Caprock Integrity for Large-Scale CO2 Storage on the Norwegian Continental Shelf

2019 ◽  
Author(s):  
Sarah Gasda ◽  
Ivar Aavatsmark ◽  
Bahman Bohloli ◽  
Helge Hellevang ◽  
Jan Nordbotten ◽  
...  
Keyword(s):  
Continental Shelf ◽  
Large Scale ◽  
Co2 Storage ◽  
Caprock Integrity ◽  
Norwegian Continental Shelf

scholarly journals Removable denture is a risk indicator for peri-implantitis and facilitates expansion of specific periodontopathogens: a cross-sectional study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Jasmin Grischke ◽  
Szymon P. Szafrański ◽  
Uthayakumar Muthukumarasamy ◽  
Susanne Haeussler ◽  
Meike Stiesch
Keyword(s):  
Bacterial Species ◽  
Positive Association ◽  
Cross Sectional Study ◽  
Risk Indicators ◽  
Risk Indicator ◽  
Sectional Study ◽  
Significant Positive Association ◽  
Cross Sectional ◽  
Linear Discriminant ◽  
Removable Denture

Abstract Background The prevalence of peri-implantitis ranges between 7 and 38.4% depending on risk indicators such as smoking, diabetes mellitus, lack of periodontal maintenance program, and history or presence of periodontitis. Currently, the possible effect of the type of superstructure on peri-implant health is unclear. This cross-sectional study aims to investigate the influence of the superstructure on the prevalence of peri-implant mucositis, peri-implantitis and peri-implant dysbiosis. Methods During a 32-month recruitment period dental implants were assessed to diagnose healthy peri-implant tissues, mucositis or peri-implantitis. The study included 1097 implants in 196 patients. Out of all peri-implantitis cases 20 randomly chosen submucosal biofilms from implants with fixed denture (FD) originating from 13 patients and 11 biofilms from implants with removable dentures (RD) originating from 3 patients were studied for microbiome analysis. Composition of transcriptionally active biofilms was revealed by RNAseq. Metatranscriptomic profiles were created for thirty-one peri-implant biofilms suffering from peri-implantitis and microbiome changes associated with superstructure types were identified. Results 16.41% of the implants were diagnosed with peri-implantitis, 25.00% of implants with RD and 12.68% of implants with FD, respectively. Multivariate analysis showed a significant positive association on patient (p =  < 0.001) and implant level (p = 0.03) between the prevalence of peri-implantitis and RD. Eight bacterial species were associated either with FD or RD by linear discriminant analysis effect size method. However, significant intergroup confounders (e.g. smoking) were present. Conclusions Within the limitations of the present work, RDs appear to be a risk indicator for peri-implantitis and seem to facilitate expansion of specific periodontopathogens. Potential ecological and pathological consequences of shift in microbiome from RDs towards higher activity of Fusobacterium nucleatum subspecies animalis and Prevotella intermedia require further investigation.

Application of LWD Multipole Sonic for Quantitative Cement Evaluation – Well Integrity in the Norwegian Continental Shelf

2021 ◽  
Author(s):  
Subhadeep Sarkar ◽  
Mathias Horstmann ◽  
Tore Oian ◽  
Piotr Byrski ◽  
George Lawrence ◽  
...  
Keyword(s):  
Continental Shelf ◽  
Time Window ◽  
Full Range ◽  
Hybrid Approach ◽  
Bond Quality ◽  
Bond Index ◽  
Early Evaluation ◽  
Well Integrity ◽  
Wide Range ◽  
Norwegian Continental Shelf

Abstract One of the crucial components of well integrity evaluation in offshore drilling is to determine the cement bond quality assuring proper hydraulic sealing. On the Norwegian Continental Shelf (NCS) an industry standard as informative reference imposes verification of cement length and potential barriers using bonding logs. Traditionally, for the last 50 years, wireline (WL) sonic tools have been extensively used for this purpose. However, the applicability of logging-while-drilling (LWD) sonic tools for quantitative cement evaluation was explored in the recent development drilling campaign on the Dvalin Field in the Norwegian Sea, owing to significant advantages on operational efficiency and tool conveyance in any well trajectory. Cement bond evaluation from conventional peak-to-peak amplitude method has shown robust results up to bond indexes of 0.6 for LWD sonic tools. Above this limit, the casing signal is smaller than the collar signal and the amplitude method loses sensitivity to bonding. This practical challenge in the LWD realm was overcome through the inclusion of attenuation rate measurements, which responds accordingly in higher bonding environments. The two methods are used in a hybrid approach providing a full range quantitative bond index (QBI) introduced by Izuhara et al. (2017). In order to conform with local requirements related to well integrity and to ascertain the QBI potential from LWD monopole sonic, a wireline cement bond log (CBL) was acquired in the first well of the campaign for comparison. This enabled the strategic deployment of LWD QBI service in subsequent wells. LWD sonic monopole data was acquired at a controlled speed of 900ft/h. The high-fidelity waveforms were analyzed in a suitable time window and both amplitude- and attenuation-based bond indexes were derived. The combined hybrid bond index showed an excellent match with the wireline reference CBL, both in zones of high as well as lower cement bonding. The presence of formation arrivals was also in good correlation with zones of proper bonding distinguishable on the QBI results. This established the robustness of the LWD cement logging and ensured its applicability in the rest of the campaign which was carried out successfully. While the results from LWD cement evaluation service are omnidirectional, it comes with a wide range of benefits related to rig cost or conveyance in tough borehole trajectories. Early evaluation of cement quality by LWD sonic tools helps to provide adequate time for taking remedial actions if necessary. The LWD sonic as part of the drilling BHA enables this acquisition and service in non-dedicated runs, with the possibility of multiple passes for observing time-lapse effects. Also, the large sizes of LWD tools relative to the wellbore ensures a lower signal attenuation in the annulus and more effective stabilization, thereby providing a reliable bond index.

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