The Experts below are selected from a list of 90 Experts worldwide ranked by ideXlab platform
Yi Huang - One of the best experts on this subject based on the ideXlab platform.
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New risk control mechanism for innovative deepwater artificial seabed system through online risk monitoring system
Applied Ocean Research, 2020Co-Authors: Xingwei Zhen, Jan Erik Vinnem, Changyi Peng, Xue Yang, Yi HuangAbstract:Abstract The current offshore field development concepts (dry tree or subsea tree) have limitations for petroleum production in ultra-deep water (more than 1500 m), where the challenges are characterized by the depth of water, remoteness and harsh environmental conditions. A new alternative offshore field development solution, termed as Deepwater Artificial Seabed (DAS) system, is proposed. The new DAS system offers improved technical and commercial performance, higher levels of safety, reduced interface complexity and improved development flexibility for field development in deep and ultra-deep water. Central to the evaluation and application of the new DAS system is the inherent risk relative to the acceptance level. Hence, barriers in the new DAS system are established and maintained to prevent, control or mitigate undesired events or accidents. This paper investigates a new risk control mechanism for the innovative DAS system in accordance with the online risk monitoring and decision support principle. Firstly, main characteristics and design principle of the DAS system are presented. On this basis, the main hazards for the DAS system are identified, which includes well incident/ loss of well control, mooring system failure, ballast system failure, leak from riser, Flexible Jumper and subsea production facilities, and damage to riser, Flexible Jumper and subsea production facilities. The risk level of the identified hazards related to offshore petroleum systems already in use is analyzed and presented by the results from the risk assessment for the Norwegian Continental Shelf (NCS) in the period of 2008–2017. It has been demonstrated that the risk associated with the key sub-systems including the ballast system, mooring system, well system and external impact protection system is at a level that calls for further risk reduction. This is followed by the barrier management principles as well as a discussion of existing and potential barriers in the DAS system. Improved barrier functions in the key sub-systems are analyzed systematically and proposals for alternative barrier functions are suggested based on the online risk modeling and decision support principle. Further, a case study in regard to the DAS mooring system failure event is conducted to demonstrate how the new risk control mechanism works. The proposed new risk control mechanism could improve the safety of the DAS system and convince the offshore petroleum industry for application significantly.
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Optimization design on the riser system of next generation subsea production system with the assistance of DOE and surrogate model techniques
Applied Ocean Research, 2019Co-Authors: Jiahao Wu, Xingwei Zhen, Yi HuangAbstract:Abstract The Next Generation Subsea Production System (NextGen SPS) is a new concept for petroleum development in ultra-deep water (UDW) areas. It can improve the structural performance of riser as well as provide several operational benefits to subsurface well completion (SWC) equipment. The design of NextGen SPS’s riser system which includes rigid riser and Flexible Jumper—like the free standing hybrid riser (FSHR), is a very important issue for the definition of NextGen SPS. This paper details an optimization design on the NextGen SPS’s riser system, with the assistance of the design of experiments (DOE) and surrogate model techniques. The optimization model pertaining to riser system is formulated firstly. The DOE is a statistical technique that guides a sensitive study on the behavior of the riser system before the optimization analysis. Structural responses are obtained by the fully coupled methodology. Through such a preliminary study, the effective contribution of each design variable at the riser performance will be known and some general conclusive remarks will be obtained. Based on the DOE results, design variables are screened to improve the efficiency of optimization process. Particle swarm optimization (PSO) method is employed to conduct the optimization analysis. In this analysis, surrogate models, which are developed by back propagation neural network (BPNN), replace the time consuming dynamic analysis to predict structural responses. Latin hypercube sampling (LHS) method is adopted to generate training sample and testing sample for the BPNN. NextGen SPS that operates at a depth of 3000 m is used as the case for this investigation. The efficiency of optimization design is improved by DOE and surrogate techniques, and a reduction of approximately 46% for the riser system cost is achieved. The obtained conclusions have applicability in reference to the engineering design of FSHR and the study procedure will provide reference for study on other new structure concept.
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analytical approach for the establishment of critical length criterion for the safe and economical design of the Flexible Jumper in deepwater applications
Applied Ocean Research, 2018Co-Authors: Xingwei Zhen, Yi Huang, Jiahao WuAbstract:Abstract The Hybrid Riser (HR) configurations based on Flexible Jumpers connected to a submerged buoy offer certain unique advantages over other field proven riser concepts in deepwater, and have been used successfully in industry. In particular, Flexible Jumpers can effectively isolate the dynamic Floating Production Unit (FPU) motions, and thus in place riser fatigue is minimized. This paper focuses on the Flexible Jumper issue, and aims to propose a highly effective analytical approach for setting its critical length criterion (CLC). The critical length is defined as the minimum length that can maintain the equilibrium between the de-coupled property and economics of the Flexible Jumper. Furthermore, the analytical approach is verified by numerical parametric studies for the Flexible Jumper of a Single Line Offset Riser (SLOR). The results demonstrate that there exists a CLC for the safe as well as economical design of the Flexible Jumper. Therefore, the usual design approach employed for the Flexible Jumper is not completely adequate, and should be complemented by alternative approaches. A new practical design method of Flexible Jumpers can be developed following the CLC presented here.
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Risk Assessment and Reduction for an Innovative Subsurface Well Completion System
Energies, 2018Co-Authors: Xingwei Zhen, Torgeir Moan, Yi HuangAbstract:In recent years, many oil and gas fields have been discovered in ultra-deep sea (UDS). Some of these fields are evaluated to have no commercial value if existing oil field development approaches are used, especially while the oil prices remain low. A new alternative field development solution, termed as Subsurface Well Completion (SWC) system, is proposed with the aim to produce oil and gas in a cost-effective manner in UDS. This system primarily consists of four parts: a tethered subsurface platform, the rigid riser, SWC equipment and Flexible Jumper. Obviously, central to the evaluation and application of the new SWC technology is the inherent risk relative to acceptance level. In particular, an uncontrolled release of hydrocarbons to sea, which may lead to catastrophical consequences involving personnel risk, environmental damage and economic losses, is a main contributor to the total risk and of great concern to the offshore petroleum industry. As for the new SWC system, any failure will not be a direct source of risk for the personnel on the surface installation due to its offset feature. In this context, this paper proposes a quantitative risk assessment (QRA) framework to assess such uncontrolled releases to sea with regard to the SWC system for an oil field in the production phase based on the new Subsurface Tension Leg Production (STLP) facility. According to the QRA results presented in this paper, the identified scenarios representing uncontrolled releases to sea are subsea wellhead leaks, rigid riser leaks, subsurface wellhead leaks, releases from X-mas tree and Flexible Jumper leaks. Among these scenarios, subsea wellhead is found to be the high-risk area. Compared with the established risk acceptance criteria (RAC), the environmental risk levels for the subsea wellhead’s leak lie within the As Low As Reasonably Practicable (ALARP) region while other risks are all below ALARP limits, which means that there is a need for improved consideration of the existing design with regard to the subsea wellhead area, and the corresponding risk reduction measures are proposed. Furthermore, the sources and effects of uncertainties are reviewed and sensitivity studies are carried out to illustrate the effect of some of the important assumptions in the risk model. It can be found that some assumptions made are conservative or optimistic while others are unknown. However, the final QRA results can be regarded as somewhat conservative. This paper concludes that the new SWC technology has a distinct advantage with respect to the leakage duration time in UDS, and thus mitigates the environmental and commercial impacts to a large extent. Besides, relaxed design requirements for the X-mas tree and Flexible Jumper can be accepted. It is also concluded that there are no serious and major commercial losses for all the identified accidental release scenarios, which is of great importance and attractiveness to oil producers.
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optimum design and global analysis of Flexible Jumper for an innovative subsurface production system in ultra deep water
China Ocean Engineering, 2014Co-Authors: Yi Huang, Xingwei Zhen, Qi Zhang, Wenhua WangAbstract:The study focuses on the Flexible Jumper issue of Subsurface Tension Leg Production (STLP) system concept, which is considered as a competing alternative system to support well completion devices and rigid risers in ultra-deep water for offshore petroleum production. The paper presents analytical and numerical approaches for the optimum design and global analysis of the Flexible Jumper. Criteria using catenary concept are developed to define the critical length for optimum design. Based on the criteria, detailed hydrodynamic analyses including quasi-static analysis, modal analysis, and dynamic analysis are performed. Modal analysis with respect to the quasi-static analysis shows that the existence of resonant modes requires special consideration. The results of dynamic analysis confirm the effectiveness of the de-coupled effect from the Jumper on STLP system. The approaches developed in the study also have wide application prospect in reference to the optimum design and analysis of any Hybrid Riser (HR) concept.
Xingwei Zhen - One of the best experts on this subject based on the ideXlab platform.
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New risk control mechanism for innovative deepwater artificial seabed system through online risk monitoring system
Applied Ocean Research, 2020Co-Authors: Xingwei Zhen, Jan Erik Vinnem, Changyi Peng, Xue Yang, Yi HuangAbstract:Abstract The current offshore field development concepts (dry tree or subsea tree) have limitations for petroleum production in ultra-deep water (more than 1500 m), where the challenges are characterized by the depth of water, remoteness and harsh environmental conditions. A new alternative offshore field development solution, termed as Deepwater Artificial Seabed (DAS) system, is proposed. The new DAS system offers improved technical and commercial performance, higher levels of safety, reduced interface complexity and improved development flexibility for field development in deep and ultra-deep water. Central to the evaluation and application of the new DAS system is the inherent risk relative to the acceptance level. Hence, barriers in the new DAS system are established and maintained to prevent, control or mitigate undesired events or accidents. This paper investigates a new risk control mechanism for the innovative DAS system in accordance with the online risk monitoring and decision support principle. Firstly, main characteristics and design principle of the DAS system are presented. On this basis, the main hazards for the DAS system are identified, which includes well incident/ loss of well control, mooring system failure, ballast system failure, leak from riser, Flexible Jumper and subsea production facilities, and damage to riser, Flexible Jumper and subsea production facilities. The risk level of the identified hazards related to offshore petroleum systems already in use is analyzed and presented by the results from the risk assessment for the Norwegian Continental Shelf (NCS) in the period of 2008–2017. It has been demonstrated that the risk associated with the key sub-systems including the ballast system, mooring system, well system and external impact protection system is at a level that calls for further risk reduction. This is followed by the barrier management principles as well as a discussion of existing and potential barriers in the DAS system. Improved barrier functions in the key sub-systems are analyzed systematically and proposals for alternative barrier functions are suggested based on the online risk modeling and decision support principle. Further, a case study in regard to the DAS mooring system failure event is conducted to demonstrate how the new risk control mechanism works. The proposed new risk control mechanism could improve the safety of the DAS system and convince the offshore petroleum industry for application significantly.
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Optimization design on the riser system of next generation subsea production system with the assistance of DOE and surrogate model techniques
Applied Ocean Research, 2019Co-Authors: Jiahao Wu, Xingwei Zhen, Yi HuangAbstract:Abstract The Next Generation Subsea Production System (NextGen SPS) is a new concept for petroleum development in ultra-deep water (UDW) areas. It can improve the structural performance of riser as well as provide several operational benefits to subsurface well completion (SWC) equipment. The design of NextGen SPS’s riser system which includes rigid riser and Flexible Jumper—like the free standing hybrid riser (FSHR), is a very important issue for the definition of NextGen SPS. This paper details an optimization design on the NextGen SPS’s riser system, with the assistance of the design of experiments (DOE) and surrogate model techniques. The optimization model pertaining to riser system is formulated firstly. The DOE is a statistical technique that guides a sensitive study on the behavior of the riser system before the optimization analysis. Structural responses are obtained by the fully coupled methodology. Through such a preliminary study, the effective contribution of each design variable at the riser performance will be known and some general conclusive remarks will be obtained. Based on the DOE results, design variables are screened to improve the efficiency of optimization process. Particle swarm optimization (PSO) method is employed to conduct the optimization analysis. In this analysis, surrogate models, which are developed by back propagation neural network (BPNN), replace the time consuming dynamic analysis to predict structural responses. Latin hypercube sampling (LHS) method is adopted to generate training sample and testing sample for the BPNN. NextGen SPS that operates at a depth of 3000 m is used as the case for this investigation. The efficiency of optimization design is improved by DOE and surrogate techniques, and a reduction of approximately 46% for the riser system cost is achieved. The obtained conclusions have applicability in reference to the engineering design of FSHR and the study procedure will provide reference for study on other new structure concept.
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analytical approach for the establishment of critical length criterion for the safe and economical design of the Flexible Jumper in deepwater applications
Applied Ocean Research, 2018Co-Authors: Xingwei Zhen, Yi Huang, Jiahao WuAbstract:Abstract The Hybrid Riser (HR) configurations based on Flexible Jumpers connected to a submerged buoy offer certain unique advantages over other field proven riser concepts in deepwater, and have been used successfully in industry. In particular, Flexible Jumpers can effectively isolate the dynamic Floating Production Unit (FPU) motions, and thus in place riser fatigue is minimized. This paper focuses on the Flexible Jumper issue, and aims to propose a highly effective analytical approach for setting its critical length criterion (CLC). The critical length is defined as the minimum length that can maintain the equilibrium between the de-coupled property and economics of the Flexible Jumper. Furthermore, the analytical approach is verified by numerical parametric studies for the Flexible Jumper of a Single Line Offset Riser (SLOR). The results demonstrate that there exists a CLC for the safe as well as economical design of the Flexible Jumper. Therefore, the usual design approach employed for the Flexible Jumper is not completely adequate, and should be complemented by alternative approaches. A new practical design method of Flexible Jumpers can be developed following the CLC presented here.
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Risk Assessment and Reduction for an Innovative Subsurface Well Completion System
Energies, 2018Co-Authors: Xingwei Zhen, Torgeir Moan, Yi HuangAbstract:In recent years, many oil and gas fields have been discovered in ultra-deep sea (UDS). Some of these fields are evaluated to have no commercial value if existing oil field development approaches are used, especially while the oil prices remain low. A new alternative field development solution, termed as Subsurface Well Completion (SWC) system, is proposed with the aim to produce oil and gas in a cost-effective manner in UDS. This system primarily consists of four parts: a tethered subsurface platform, the rigid riser, SWC equipment and Flexible Jumper. Obviously, central to the evaluation and application of the new SWC technology is the inherent risk relative to acceptance level. In particular, an uncontrolled release of hydrocarbons to sea, which may lead to catastrophical consequences involving personnel risk, environmental damage and economic losses, is a main contributor to the total risk and of great concern to the offshore petroleum industry. As for the new SWC system, any failure will not be a direct source of risk for the personnel on the surface installation due to its offset feature. In this context, this paper proposes a quantitative risk assessment (QRA) framework to assess such uncontrolled releases to sea with regard to the SWC system for an oil field in the production phase based on the new Subsurface Tension Leg Production (STLP) facility. According to the QRA results presented in this paper, the identified scenarios representing uncontrolled releases to sea are subsea wellhead leaks, rigid riser leaks, subsurface wellhead leaks, releases from X-mas tree and Flexible Jumper leaks. Among these scenarios, subsea wellhead is found to be the high-risk area. Compared with the established risk acceptance criteria (RAC), the environmental risk levels for the subsea wellhead’s leak lie within the As Low As Reasonably Practicable (ALARP) region while other risks are all below ALARP limits, which means that there is a need for improved consideration of the existing design with regard to the subsea wellhead area, and the corresponding risk reduction measures are proposed. Furthermore, the sources and effects of uncertainties are reviewed and sensitivity studies are carried out to illustrate the effect of some of the important assumptions in the risk model. It can be found that some assumptions made are conservative or optimistic while others are unknown. However, the final QRA results can be regarded as somewhat conservative. This paper concludes that the new SWC technology has a distinct advantage with respect to the leakage duration time in UDS, and thus mitigates the environmental and commercial impacts to a large extent. Besides, relaxed design requirements for the X-mas tree and Flexible Jumper can be accepted. It is also concluded that there are no serious and major commercial losses for all the identified accidental release scenarios, which is of great importance and attractiveness to oil producers.
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optimum design and global analysis of Flexible Jumper for an innovative subsurface production system in ultra deep water
China Ocean Engineering, 2014Co-Authors: Yi Huang, Xingwei Zhen, Qi Zhang, Wenhua WangAbstract:The study focuses on the Flexible Jumper issue of Subsurface Tension Leg Production (STLP) system concept, which is considered as a competing alternative system to support well completion devices and rigid risers in ultra-deep water for offshore petroleum production. The paper presents analytical and numerical approaches for the optimum design and global analysis of the Flexible Jumper. Criteria using catenary concept are developed to define the critical length for optimum design. Based on the criteria, detailed hydrodynamic analyses including quasi-static analysis, modal analysis, and dynamic analysis are performed. Modal analysis with respect to the quasi-static analysis shows that the existence of resonant modes requires special consideration. The results of dynamic analysis confirm the effectiveness of the de-coupled effect from the Jumper on STLP system. The approaches developed in the study also have wide application prospect in reference to the optimum design and analysis of any Hybrid Riser (HR) concept.
Wang Yuping - One of the best experts on this subject based on the ideXlab platform.
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electrical test of Flexible Jumper in double pole composite strain tower of 1000 kv ac ultra high voltage
Electric Power Construction, 2011Co-Authors: Wang YupingAbstract:Based on the project of application and investigation of double-pole-composite strain tower of 1 000 kV ultra high voltage,the electrical test program of Flexible Jumper system in double-pole-composite strain tower is introduced.By the analysis of test result,it is shown that the electrical properties of the Flexible Jumper system can meet the engineering requirements.
Zhang Tianguang - One of the best experts on this subject based on the ideXlab platform.
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Flexible Jumper design of 1000 kv ac uhv double pole composite strain tower
Electric Power Construction, 2009Co-Authors: Zhang TianguangAbstract:The double-pole-composite strain tower used for 1 000 kV UHV 1-tower double-circuit transmission line project adopts Flexible Jumpers and cancels the Jumper crossarm,which reduces the tower size and nominal height,and engineering cost.The paper analyzed the strain tower Jumper characters,Jumper string suspension angle and soft Jumper tension calculation.Taking the 1 000 kV 1-tower double-circuit transmission line from Huainan to Shanghaias an example,the paper calculated the Flexible Jumper tension and declination angle of jumping insulator string for 4 kinds in the single-pole-composite strain tower.The result shows that conventional jumping clamp can not meet the requirements and comments are to develop specially UHV Flexible jumping clamps.
Wenhua Wang - One of the best experts on this subject based on the ideXlab platform.
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optimum design and global analysis of Flexible Jumper for an innovative subsurface production system in ultra deep water
China Ocean Engineering, 2014Co-Authors: Yi Huang, Xingwei Zhen, Qi Zhang, Wenhua WangAbstract:The study focuses on the Flexible Jumper issue of Subsurface Tension Leg Production (STLP) system concept, which is considered as a competing alternative system to support well completion devices and rigid risers in ultra-deep water for offshore petroleum production. The paper presents analytical and numerical approaches for the optimum design and global analysis of the Flexible Jumper. Criteria using catenary concept are developed to define the critical length for optimum design. Based on the criteria, detailed hydrodynamic analyses including quasi-static analysis, modal analysis, and dynamic analysis are performed. Modal analysis with respect to the quasi-static analysis shows that the existence of resonant modes requires special consideration. The results of dynamic analysis confirm the effectiveness of the de-coupled effect from the Jumper on STLP system. The approaches developed in the study also have wide application prospect in reference to the optimum design and analysis of any Hybrid Riser (HR) concept.