scholarly journals Decision Diagram Algorithms to Extract Minimal Cutsets of Finite Degradation Models

Information ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 368 ◽  
Author(s):  
Antoine Rauzy ◽  
Yang
Keyword(s):  
Oil And Gas ◽  
Decomposition Theorem ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
Fault Trees ◽  
Attack Trees ◽  
Degradation Models ◽  
Reliability Block Diagrams ◽  
And Performance ◽  
The One

In this article, we propose decision diagram algorithms to extract minimal cutsets of finite degradation models. Finite degradation models generalize and unify combinatorial models used to support probabilistic risk, reliability and safety analyses (fault trees, attack trees, reliability block diagrams…). They formalize a key idea underlying all risk assessment methods: states of the models represent levels of degradation of the system under study. Although these states cannot be totally ordered, they have a rich algebraic structure that can be exploited to extract minimal cutsets of models, which represent the most relevant scenarios of failure. The notion of minimal cutsets we introduce here generalizes the one defined for fault trees. We show how algorithms used to calculate minimal cutsets can be lifted up to finite degradation models, thanks to a generic decomposition theorem and an extension of the binary decision diagrams technology. We discuss the implementation and performance issues. Finally, we illustrate the interest of the proposed technology by means of the use case stemmed from the oil and gas industry.

Successfully managing Aboriginal cultural heritage—LNG and other stories

2010 ◽  
Vol 50 (2) ◽  
pp. 698
Author(s):  
Paul Travers
Keyword(s):  
Cultural Heritage ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Essential Elements ◽  
Heritage Management ◽  
Duty Of Care ◽  
Gas Industry ◽  
Management Guidelines ◽  
Cultural Heritage Management ◽  
The One

The various LNG projects in Queensland presented industry and traditional owners with a unique set of circumstances. On the one hand, LNG proponents were required to engage individually with traditional owner groups regarding cultural heritage. On the other hand, traditional owner groups were dealing with a variety of LNG proponents each seeking agreement about the same thing but in different ways. The paper examines this issue, considers a number of the pitfalls, and asks whether there is a case for standardising the management of cultural heritage. The current review of the Commonwealth Aboriginal and Torres Strait Islander Heritage Protection Act 1984 appears to support this approach. This paper will also look at the various ways cultural heritage has been managed in Queensland, as well as in other states and territories, and assesses whether there really is a better way for proponents in the oil and gas industry to manage this issue. Paul Travers was responsible for developing Queensland’s Aboriginal Cultural Heritage Act 2003. He also drafted the Aboriginal cultural heritage duty of care and cultural heritage management guidelines under the legislation. He has worked with LNG proponents and traditional owners in relation to LNG projects in Queensland. He brings an interesting and unique take on the essential elements of successful cultural heritage management.

scholarly journals Theoretical and practical aspects of assessment of innovative activity in oil and gas enterprises

2020 ◽  
Vol 13 (4) ◽  
pp. 531-540
Author(s):  
M. V. Rybin ◽  
D. S. Lobov
Keyword(s):  
Life Cycle ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Innovative Activity ◽  
Gas Industry ◽  
The Innovative Management ◽  
And Performance ◽  
Key Indicators ◽  
Oil And Gas Companies ◽  
Oil And Gas Enterprises

Analysis of theoretical and practical aspects of assessment of innovative activity at national and foreign oil and gas enterprises revealed the necessity of improvement of the existing tools which include the lists of key indicators of efficiency and performance applied within the innovative development programs of the Russian companies. Thereby the authors analyzed national and foreign research paying the most serious attention to theoretical aspects of innovative activity assessment. Among them of greatest interest is the complex approach to application of metrics in scientific and technical development of a company. The authors have also studied the conceptual apparatus and the main terms for the problems under consideration. As a result, the research confirmed the idea that the practice of applying the lists of key indicators of innovative activity in oil and gas industry does not coincide with the results of academic works and the innovative management theory: the current methods are primarily aimed at assessment of the results of innovative activity, several stages of the life cycle of creation of innovation are not subject to monitoring. At the same time lists of key indicators of innovative activity make it possible for the company’s management to estimate economic and resource effects of innovations which corresponds to strategic interests of oil and gas companies.Lists of indicators of efficiency and performance of innovative activity can be improved by means of national and foreign research. It is important to involve more metrics which make it possible to monitor all the life cycle of creation and implementation of innovative solutions.The results of the study can be used as the basis for further research on improvement and development of the lists of key indicators of innovative activity of oil and gas companies.

scholarly journals Experimental study of circular inlets effect on the performances of Gas-Liquid Cylindrical Cyclone separators (GLCC)

2020 ◽  
Vol 3 (SI1) ◽  
pp. First
Author(s):  
Ho Minh Kha ◽  
Nguyen Thanh Nam ◽  
Vo Tuyen ◽  
Nguyen Tan Ken
Keyword(s):  
Oil And Gas ◽  
New Technology ◽  
Oil And Gas Industry ◽  
Critical Element ◽  
Gas Industry ◽  
Cylindrical Cyclone ◽  
Inlet Geometry ◽  
Petroleum Companies ◽  
Two Phases ◽  
The One

The gas-liquid cylindrical cyclone (GLCC) separators is a fairly new technology for the oil and gas industry. The current GLCC separator, a potential alternative for the conventional one, was studied, developed, and patented by Chevron company and Tulsa University (USA). It is used for replacing the traditional separators that have been used over the last 100 years. In addition, it is significantly attracted to petroleum companies in recent years because of the effect of the oil world price. However, the behavior of phases in the instrument is very rapid, complex, and unsteady, which may cause the difficulty of enhancing the performance of the separation phases. The multiple recent research shows that the inlet geometry is probably the most critical element that influences directly to the performance of separation of phases. Though, so far, most of the studies of GLCC separator were limited with the one inlet model. The main target of the current study is to deeply understand the effect of different geometrical configurations of the circular inlet on performances of GLCC by the experimental method for two phases flow (gas-liquid). Two different inlet configurations are constructed, namely: One circular inlet and two symmetric circular inlets. As a result, we propose the use of two symmetric circular inlets to enhance separator efficiency because of their effects.

Decarbonization and Improved Energy Efficiency Using a Novel Nanocomposite Surface Treatment

2021 ◽  
Author(s):  
Matthew Nakatsuka ◽  
Basile Marco ◽  
Sumil Thapa ◽  
Alexander Ventura ◽  
Osvaldo Pascolini ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Surface Treatment ◽  
Carbon Emissions ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
Low Surface Energy ◽  
Microbially Induced Corrosion ◽  
Corrosion Pitting ◽  
The One

Abstract Fouling of heat exchanger equipment through the formation and attachment of hard scale, microbially induced corrosion (MIC) products, or particulate erosion is a serious challenge to reliable production in the oil and gas industry. Exchangers which become fouled in this way perform 15-30% worse than their rated ability, requiring either constant intervention to clean away biofilms, continuous injection of biocides and corrosion inhibitors, or the regular plugging of tubes to prevent leaks, representing a significant operating expense and billions of dollars in lost production time. When an exchanger is unable to provide sufficient heat due to tube fouling, additional sources of heating must be utilized to make up for this deficit and to ensure that facility processes remain within design allowances. This need for supplemental heating is a significant source of carbon emissions in the industry and represents a significant obstacle towards decarbonization efforts. However, it also represents an economically attractive way to simultaneously lower emissions while also lowering a producer's cost per barrel. This work describes an alternate strategy to control and prevent fouling in heat exchangers, through the one-time application of an omniphobic (water- and oil-repelling) nano-surface treatment. Once applied to a heat exchanger, the extremely smooth and low-surface energy material greatly reduces the ability of MIC-causing bacteria to deposit and adhere to the surface. Because it imparts functionality to the surface itself, rather than simply function as a physical barrier, it enables long lasting protection which was validated under laboratory conditions in a pressurized autoclave, as well as two pilot demonstrations. Results from both the laboratory and field evaluations of the treatment's promise showed that treated surfaces showed a corrosion rate over 36-times lower when compared to untreated surfaces, while also completely arresting the formation of corrosion pitting, tube fouling, and erosion of the tube interior. These field-validated results were then applied to the observed heating deficit of a proposed deployment site, resulting in calculated carbon emissions savings of up to 17,000 Tons CO2 per year.

Top Tensioned Riser Interface With Dry-Tree Semisubmersible

2014 ◽  
Author(s):  
Sherry Xiang ◽  
Peimin Cao ◽  
Jeff Otten ◽  
Lei Jiang ◽  
Sean Bian
Keyword(s):  
System Design ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Supporting Surface ◽  
Gas Industry ◽  
Overall Design ◽  
Assembly Design ◽  
High Reaction ◽  
Dynamic Analyses ◽  
And Performance

Dry Tree Semisubmersibles (DTS), with the capability of supporting surface wellheads and allowing drilling and completion through direct vertical access risers, have attracted intense interest from the oil and gas industry. A wet tree deep draft semisubmersible has been carefully reconfigured considering the balance between the overall floater configuration and the tensioner stroke for a harsh environment application. A large amount of simulation efforts have been performed for the optimization of the integrated hull/deck/mooring/riser system. Recently, a basin model test was also successfully completed and further demonstrated its technical feasibility. The paper presents the overall design of a Top-Tensioned Riser (TTR) system for a DTS application focusing on the complexity of the DTS-TTR interface including ram style tensioning system, riser conductor and riser top assembly design with keel joint, etc. Due to the heavy weight of the TTR system in the ultra-deep water application, the riser top sections are subject to high reaction loads with the DTS in severe environments. The riser system faces the challenge to have a feasible and economic top assembly design. In this paper, an engineered riser conductor pipe is introduced to interface the riser top assembly with hull. The riser conductor pipe, which spans from deck to keel, is integrated with riser top assembly and the tensioner system design. The riser conductor protects the riser in the splash zone and prevents the high reaction loads directly transferring from hull to riser, thus reducing the riser keel joint and tension joint size. The feasibility and performance of the TTR system are demonstrated through the static and dynamic analyses. Pipe-in-pipe (PIP) contact model is employed in the simulation to ensure the dynamic interaction loads between riser and riser conductor are captured. The TTR overall system design consideration for the DTS application is discussed.

Integrating human factors and prevention systems to improve safe operations and performance

2013 ◽  
Vol 53 (2) ◽  
pp. 494
Author(s):  
Jane Austin ◽  
Kerry Houston
Keyword(s):  
High Risk ◽  
Best Practices ◽  
Human Factors ◽  
Work Environment ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
Business Results ◽  
And Performance ◽  
Multiple Step

The high-risk nature of the oil and gas industry means the search for best practices to ensure employees suffer no harm is ongoing. Our industry has undergone multiple-step changes in safety, including the eras of death, engineering, regulations, and, more recently, behaviours. The unifying aspect to expand the results achieved from these step changes is the seamless merging of human factors and prevention systems, which are explored in further detail in this extended abstract. Human factors are how individuals behave physically and psychologically to their work environment. Prevention systems are the equipment, systems, and processes the organisation provides and implements to keep individuals safe in the work environment. The manner in which human factors and prevention systems collaborate delineates Intertek's processes in safety. To better understand both human factors and prevention systems, the authors analysed their sub-components, ultimately making their use more relevant for the needs of this industry. A consistent understanding of each subsequently allows better identification of where the gaps may exist and allows focus on processes for not only improved business results but also achievement of no harm to employees. Although this extended abstract primarily concentrates on human factors, a means of assessing employees' abilities to behave in their work environment alongside an organisation's prevention systems is also discussed.

The Effect of the Different Inlet's Structures of the Gas-Liquid Cylindrical Cyclone (GLCC) Separator

2019 ◽  
Vol 894 ◽  
pp. 112-125
Author(s):  
Minh Kha Ho ◽  
Thanh Nam Nguyen ◽  
Ngoc Phuong Nguyen ◽  
Vo Tuyen
Keyword(s):  
Oil And Gas ◽  
Separation Efficiency ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
Cylindrical Cyclone ◽  
Symmetric Square ◽  
Two Phases ◽  
And Performance ◽  
Carry Over ◽  
Two Phases Flow

The inlet’s geometry is always the core factor that directly affects hydrodynamics and separation efficiency of the cyclone separation types. The Gas-Liquid Cylindrical Cyclone (GLCC) separators have been developed in recent years to separate into single phases of multiphase mixtures in the oil and gas industry. It is used to substitute for the traditional separator that is used over 100 years. However, the action of phases in the instrument is very fast, complicated and unsteady which may cause the difficulty to enhance the performance of the separation phases. Besides, the effect of inlet’s structures over its hydrodynamics and performance is not fully understood. The target of this study is to use experimental modeling for two phases flow (gas-water) to evaluate the effect of inlet geometrical modifications in the reduction of liquid carry-over (LCO). Four different inlet configurations are constructed, namely: One circular inlet, two symmetric circular inlets, one square inlet and two symmetric square inlets with the gradually reduced nozzle. From the results presented in this work, we propose the use of two symmetric inlets to enhance the separator efficiency because of their effects.

Stakeholders' Engagement and Performance Efficiency at Oil and Gas Industry in Yemen

2021 ◽  
Vol 2 (1) ◽  
pp. 1-15
Author(s):  
Mohammed Ahmed Al-Haddad ◽  
Mohammed Saleh Al-Abed
Keyword(s):  
Oil And Gas ◽  
Primary Source ◽  
Oil And Gas Industry ◽  
Online Questionnaire ◽  
Gas Industry ◽  
Exploration And Production ◽  
Planning Development ◽  
And Performance ◽  
Liquid Natural Gas ◽  
The Impact

Oil and Gas industry in Yemen is considered as the biggest and variable sector. Therefore, the performance efficiency is very important to be attained during all the activities and phases that include searching, drilling, upstream, midstream, and downstream. As a crucial factor, stakeholders’ engagement theories have been emphasized the central role of stakeholders’ engagement to strategic planning efforts in contemporary organizations. This study therefore examined the impact of stakeholders’ engagement on the performance efficiency (time, cost, and quality) at the Yemeni oil and gas industry. The quantitative method was employed and online questionnaire was used as a primary source for collecting data. The sample size was 312, selected from three oil and gas companies; namely; Yemen Liquid Natural Gas Company, Safer Exploration and Production Oil Company and OMV Company. This study targeted managers and non-managers. The results show that stakeholders’ engagement has a significant relationship with the performance efficiency. In addition, stakeholders’ engagement has a significant impact on the performance efficiency. The results suggest the consideration of early stakeholders’ engagement in the planning, development, implementation, controlling and evaluation the performance. Managers should enhance every step regarding the participation of the stakeholders in the decision-making process. In addition, more effective practices will support achieving performance efficiency.

scholarly journals Basic Refinery Training Courseware in Enhancing Technical Employees’ Visualization Skills

2021 ◽  
Vol 15 (23) ◽  
pp. 45-56
Author(s):  
Norarbaiyah Yaacob ◽  
Dayana Farzeeha Ali ◽  
Abdul Halim Abdullah ◽  
Norasykin Mohd Zaid ◽  
Mahani Mokhtar ◽  
...  
Keyword(s):  
Augmented Reality ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Oil Refinery ◽  
Training Methods ◽  
Training Experience ◽  
Gas Field ◽  
Gas Industry ◽  
Oil And Gas Field ◽  
And Performance

Various research has been conducted to enhance the employees’ visualization skills in different areas and the importance and the role of visualization skills towards the employee’s achievement, especially in the industry such as manufacturing, medical, oil and gas field, and many more. To improve visualization skills, the use of effective training methods and tools should be applied to facilitate and enhance the understanding and performance in general, in a way to help them solve problems at the workplace. Thus, the aim of this paper focuses to the attention on the practical use of augmented reality (AR) with the ability of digital mobile application in the crude oil refinery process within the oil and gas industry environment, describing the potential and the effectiveness of the technology to enhance the visualization skill among the technical employees. This study used Basic refinery courseware that can be accessed via digital network to give an interactive training experience that can enhance technical employees' visualization skills. This courseware shows the positive effect and impact on technical employees’ visualization skills and performance based on the results. The results have also shown an increased motivation, making them more cooperative and developing visualization skills more quickly. Considering these results, it can be concluded that Basic Refinery training courseware based on augmented reality application is an effective and beneficial tool to be applied in training programs among the workplace's technical employees.

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