The Experts below are selected from a list of 1110 Experts worldwide ranked by ideXlab platform
A S Cheliyan - One of the best experts on this subject based on the ideXlab platform.
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optimization of a Subsea Production System for cost and reliability using its fault tree model
Reliability Engineering & System Safety, 2019Co-Authors: S.k. Bhattacharyya, A S CheliyanAbstract:Abstract A method of optimizing the cost and reliability of a System represented by a fault tree is proposed which is useful in choosing the technology options for basic events that are available to the System designer. The problem of optimization is to minimize the overall System cost by exercising technology choices that will yield a prescribed probability of failure of the top event of the System. The well known non-dominated sorting genetic algorithm (NSGA-II) has been used for optimization. Both single and two objective optimization problems have been explored and their numerical convergence features discussed. The application problem treated is one of leakage in a Subsea Production System.
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fuzzy fault tree analysis of oil and gas leakage in Subsea Production Systems
Journal of Ocean Engineering and Science, 2017Co-Authors: A S Cheliyan, S.k. BhattacharyyaAbstract:Abstract This paper presents a probabilistic failure analysis of leakage of the oil and gas in a Subsea Production System using fault tree analysis (FTA). A fault tree was constructed by considering four major areas where the leakages can be initiated. These are: gas and oil wells, pipelines, key facilities and third party damage. Conventional FTA requires precise values for the probability of failure of the basic events. However, since the failure data are uncertain, a fuzzy approach to these data is taken which leads to the so-called fuzzy fault tree analysis (FFTA), a method that employs expert elicitation and fuzzy set theories to calculate the failure probabilities of the intermediate events and the top event through identification of the minimal cut sets of the fault tree. A number of importance measures for minimal cut sets and the basic events have been obtained which helps to identify the nature of dependence of the top event on the basic events and thereby can identify the weakest links that may cause leakage in the Subsea Production System.
Deguo Wang - One of the best experts on this subject based on the ideXlab platform.
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study of the installation process of the Subsea tree passed through the splash zone
Energies, 2020Co-Authors: Yufang Li, Xiaoyu Wang, Honglin Zhao, Ning Xu, Deguo WangAbstract:The Subsea tree is one of the critical pieces of equipment in the Subsea Production System, and its installation is related to the safe Production of offshore oil and gas. Due to the differences in the form of the structures, the speed of entering the water, the marine environment, and other factors, the process of the structure entering the water is exceedingly complicated. During the engineering installation, the most dangerous phase involves the structure passing through the splash zone. Based on the theory of the movement of the Subsea tree passing through the splash zone, Lingshui 17-2 Subsea tree installation was analyzed with the marine engineering software OrcaFlex, and a sensitivity analysis of the lowering of the Subsea tree was performed. During the splash zone phase, the wave height had the highest impact on the Subsea tree, affecting the horizontal offset and cable load, which may lead to the oil tree capsizing and cable breakage. Furthermore, the velocity only affected the horizontal offset, and the overall effect was not noticeable. The operational safety window for the Subsea tree installation was established according to the operational safety standards. Therefore, the recommended lowering speed was 0.50 m/s, while the flow velocity should not exceed 1.50 m/s, and the wave height should not be higher than 4.5 m.
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An Exploratory Study on Optimum Layout of the Cluster Manifold
Volume 5: Ocean Engineering; CFD and VIV, 2012Co-Authors: Yingying Wang, Deguo Wang, Menglan Duan, Xu Yuan, Kai TianAbstract:There are four typical layout types for the Subsea Production System. These include single well tie back, the daisy chain, the template manifold and the cluster manifold. In the early development phase, an appropriate layout type needs to be selected. The layout design of the Subsea Production System is based on the data of oil and gas fields. Due to many advantages, such as less initial investment, being installed in advance, flexibility for development schedule and so on, the cluster manifold is becoming more popular and has been applied extensively in the layout of deepwater Subsea Production Systems. In this layout type, the number and locations of cluster manifolds, and the connection types between Subsea Production facilities have a direct effect on the safety, flexibility and cost of the target deepwater oil and gas fields. Hence, how to design the optimal layout of the cluster manifold is of key importance. This paper will focus on the cluster manifold layout by the math means programmed using C++. For any given Subsea well and the floating Production System, the basic layout of the cluster manifold with the lowest cost can be obtained based on the assumptions, including the number, locations and cost of the jumpers, PLETS and flowlines. This mathematical method can reduce subjective bias from the engineers and provide a more scientific reference for obtaining the optimal cluster manifold layout.Copyright © 2012 by ASME
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A mathematical model for Subsea wells partition in the layout of cluster manifolds
Applied Ocean Research, 2012Co-Authors: Yingying Wang, Deguo Wang, Menglan Duan, Wei FengAbstract:Abstract The layout of cluster manifolds in the Subsea Production System mainly affects the efficiency, safety and cost of deepwater oil and gas fields. For constructing an optimal layout of cluster manifolds, Subsea wells shall be first allocated to different well sets, and then, for each well set, a cluster manifold is mounted at a suitable location and connected with all Subsea wells in the same well set. The Subsea wells partition is a fundamental work for constructing an optimal layout of cluster manifolds. In this paper, a mathematical model of partition of Subsea wells is developed, and its algorithm is also correspondingly proposed and programmed by MATLAB. Numerical analysis is performed and discussed for a specific case of Subsea wells partition to verify the model's accuracy and the algorithm's feasibility. The results show that the mathematical model is appropriate for describing the partition problem, and the algorithm is efficient for the mathematical model. The connection cost between Subsea wells and cluster manifolds can be thus decreased as greatly as possible. Compared with the traditional experience, it avoids the negative effects of human factors, and provides a more scientific and quantitative means for the layout of Subsea Production System.
S.k. Bhattacharyya - One of the best experts on this subject based on the ideXlab platform.
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optimization of a Subsea Production System for cost and reliability using its fault tree model
Reliability Engineering & System Safety, 2019Co-Authors: S.k. Bhattacharyya, A S CheliyanAbstract:Abstract A method of optimizing the cost and reliability of a System represented by a fault tree is proposed which is useful in choosing the technology options for basic events that are available to the System designer. The problem of optimization is to minimize the overall System cost by exercising technology choices that will yield a prescribed probability of failure of the top event of the System. The well known non-dominated sorting genetic algorithm (NSGA-II) has been used for optimization. Both single and two objective optimization problems have been explored and their numerical convergence features discussed. The application problem treated is one of leakage in a Subsea Production System.
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fuzzy fault tree analysis of oil and gas leakage in Subsea Production Systems
Journal of Ocean Engineering and Science, 2017Co-Authors: A S Cheliyan, S.k. BhattacharyyaAbstract:Abstract This paper presents a probabilistic failure analysis of leakage of the oil and gas in a Subsea Production System using fault tree analysis (FTA). A fault tree was constructed by considering four major areas where the leakages can be initiated. These are: gas and oil wells, pipelines, key facilities and third party damage. Conventional FTA requires precise values for the probability of failure of the basic events. However, since the failure data are uncertain, a fuzzy approach to these data is taken which leads to the so-called fuzzy fault tree analysis (FFTA), a method that employs expert elicitation and fuzzy set theories to calculate the failure probabilities of the intermediate events and the top event through identification of the minimal cut sets of the fault tree. A number of importance measures for minimal cut sets and the basic events have been obtained which helps to identify the nature of dependence of the top event on the basic events and thereby can identify the weakest links that may cause leakage in the Subsea Production System.
Menglan Duan - One of the best experts on this subject based on the ideXlab platform.
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Reliability Modelling of Subsea Cluster Manifolds Based on the Fault Tree Analysis
Volume 3: Structures Safety and Reliability, 2016Co-Authors: Yingying Wang, Menglan Duan, Houfa LiuAbstract:The cluster manifold becomes an essential part in a Subsea Production System and it has been widely used in the development of ultra-deepwater oil and gas fields. One hand, it can gather the Production fluid from Subsea wells. On the other hand, it can distribute water, gas and chemical agents from the floating Production System to each Subsea well. Hence, the failure of Subsea cluster manifolds may not only lead to the stagnation of Production wells and economic losses but also cause environmental pollution and human health in severe cases. Therefore, the reliability of Subsea cluster manifolds is quite of importance and it should be studied for the safety service of the Subsea Production System. Based on the fault tree analysis (FTA), this paper will discuss the failure cause of six well slots Subsea cluster manifolds in LiWan 3-1 gas field in China South Sea. Considering the pipeline structure, control System and flow assurance, the fault trees of Subsea cluster manifolds are built. Meanwhile, the importance degrees of each elementary event are ranked orderly and the minimum cut sets are obtained through analyzing the structure important of the FTA. The failure major reasons are obtained and the preventive measures are proposed, which could have some guiding significance for the operations of Subsea cluster manifolds System in China South Sea.
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risk analysis of oil and gas leakage of Subsea Production System based on fuzzy fault tree
International journal of energy engineering, 2013Co-Authors: Menglan Duan, Haitao ZhangAbstract:Subsea Production System, being of high value to deep water oil and gas Production, has become more and more important recently. Simultaneously, issues related to its safety and reliability are hotly disputed by engineers and scholars. Based on fuzzy fault tree, risk analysis of oil and gas leakage is successfully completed. Through the construction of fault tree, qualitative analysis is conducted, obtaining minimum cut sets and cut-sets importance. Moreover, quantitative analysis, based on theory of fuzzy sets, is employed, through which failure probability, probabilistic importance and critical importance have been figured out. The above- mentioned results serve as a good reference to avoid oil and gas leakage in Subsea Production System.
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An Exploratory Study on Optimum Layout of the Cluster Manifold
Volume 5: Ocean Engineering; CFD and VIV, 2012Co-Authors: Yingying Wang, Deguo Wang, Menglan Duan, Xu Yuan, Kai TianAbstract:There are four typical layout types for the Subsea Production System. These include single well tie back, the daisy chain, the template manifold and the cluster manifold. In the early development phase, an appropriate layout type needs to be selected. The layout design of the Subsea Production System is based on the data of oil and gas fields. Due to many advantages, such as less initial investment, being installed in advance, flexibility for development schedule and so on, the cluster manifold is becoming more popular and has been applied extensively in the layout of deepwater Subsea Production Systems. In this layout type, the number and locations of cluster manifolds, and the connection types between Subsea Production facilities have a direct effect on the safety, flexibility and cost of the target deepwater oil and gas fields. Hence, how to design the optimal layout of the cluster manifold is of key importance. This paper will focus on the cluster manifold layout by the math means programmed using C++. For any given Subsea well and the floating Production System, the basic layout of the cluster manifold with the lowest cost can be obtained based on the assumptions, including the number, locations and cost of the jumpers, PLETS and flowlines. This mathematical method can reduce subjective bias from the engineers and provide a more scientific reference for obtaining the optimal cluster manifold layout.Copyright © 2012 by ASME
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A mathematical model for Subsea wells partition in the layout of cluster manifolds
Applied Ocean Research, 2012Co-Authors: Yingying Wang, Deguo Wang, Menglan Duan, Wei FengAbstract:Abstract The layout of cluster manifolds in the Subsea Production System mainly affects the efficiency, safety and cost of deepwater oil and gas fields. For constructing an optimal layout of cluster manifolds, Subsea wells shall be first allocated to different well sets, and then, for each well set, a cluster manifold is mounted at a suitable location and connected with all Subsea wells in the same well set. The Subsea wells partition is a fundamental work for constructing an optimal layout of cluster manifolds. In this paper, a mathematical model of partition of Subsea wells is developed, and its algorithm is also correspondingly proposed and programmed by MATLAB. Numerical analysis is performed and discussed for a specific case of Subsea wells partition to verify the model's accuracy and the algorithm's feasibility. The results show that the mathematical model is appropriate for describing the partition problem, and the algorithm is efficient for the mathematical model. The connection cost between Subsea wells and cluster manifolds can be thus decreased as greatly as possible. Compared with the traditional experience, it avoids the negative effects of human factors, and provides a more scientific and quantitative means for the layout of Subsea Production System.
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risk assessment of Subsea x tree System
Applied Mechanics and Materials, 2011Co-Authors: Chang Yong Wang, Hong Huan Zhang, Menglan DuanAbstract:That the oil and gas exploration and development is extending into deep water proceeds the rapidly shift to Subsea Production System. However, complex Subsea equipment and frequency offshore accidents aroused the concern on the risk assessment of Subsea System. The paper illustrates the hazard aspects which should be focused on in the Subsea equipment compared with the surface equipment. The hazards identification and risk analysis on Subsea X-tree System is carried out. A general risk-prevent process of Subsea X-tree System is illustrated, so does the reliability analysis process. Besides, some commendations on Subsea detection and maintenance are presented in the paper.
D. Brewster - One of the best experts on this subject based on the ideXlab platform.
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Pompano Subsea Development: Template/Manifold, Tree & ROV Intervention Systems
Offshore Technology Conference, 2013Co-Authors: M.m. Beckmann, J W Riley, C K Snell, M.l. Byrd, J. Holt, C. Tyer, D. BrewsterAbstract:BP Exploration`s Pompano Subsea Development, in 1,865 ft of water in the Gulf of Mexico, uses a Subsea Production System to produce oil to a host platform 4{1/2} miles away. The 10-slot Subsea template/manifold supports Through FlowLine (TFL) wells, which are controlled by means of an electrohydraulic control System. All process components of the System are retrievable with ROV intervention. This paper describes the template/manifold System, TFL tree System and ROV intervention Systems.
