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Atila Ertas - One of the best experts on this subject based on the ideXlab platform.

  • Upper Ball Joint Force Variations due to Riser Tensioner and Vessel Motions—Part II: Analysis and Computer Simulation
    Journal of Energy Resources Technology-transactions of The Asme, 1990
    Co-Authors: T. J. Kozik, J. E. Lowell, Atila Ertas
    Abstract:

    Part 2 of a study of upper ball joint force variations due to riser Tensioner and vessel motions. An analysis of the variation of forces acting on the upper ball joint of a riser string due to the drill ship motion and riser Tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the Tensioner sheaves while assuming vessel and upper ball joint motion to be independent. General equation for the Tensioner cable forces and for the forces exerted on the riser upper ball joint by the ship joint-Tensioner system derived in Part I are solved. The variation in the Tensioner cable forces is compared to data generated in field operation

  • Upper Ball Joint Force Variations due to Riser Tensioner and Vessel Motions—Part I: Derivation of General Equations
    Journal of Energy Resources Technology-transactions of The Asme, 1990
    Co-Authors: T. J. Kozik, J. E. Lowell, Atila Ertas
    Abstract:

    Part one of a study of upper ball joint force variations due to riser Tensioner and vessel motions. General equation for the Tensioner cable forces and for the forces exerted on the riser upper ball joint by the ship joint-Tensioner system are derived. An analysis of the variation of forces acting on the upper ball joint of a riser string due to drill ship motion and riser Tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the Tensioner sheaves while assuming vessel and upper ball joint motion to be independent

  • upper ball joint force variations due to riser Tensioner and vessel motions part i derivation of general equations
    Journal of Energy Resources Technology-transactions of The Asme, 1990
    Co-Authors: T. J. Kozik, J. E. Lowell, Atila Ertas
    Abstract:

    Part one of a study of upper ball joint force variations due to riser Tensioner and vessel motions. General equation for the Tensioner cable forces and for the forces exerted on the riser upper ball joint by the ship joint-Tensioner system are derived. An analysis of the variation of forces acting on the upper ball joint of a riser string due to drill ship motion and riser Tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the Tensioner sheaves while assuming vessel and upper ball joint motion to be independent

  • upper ball joint force variations due to riser Tensioner and vessel motions part ii analysis and computer simulation
    Journal of Energy Resources Technology-transactions of The Asme, 1990
    Co-Authors: T. J. Kozik, J. E. Lowell, Atila Ertas
    Abstract:

    Part 2 of a study of upper ball joint force variations due to riser Tensioner and vessel motions. An analysis of the variation of forces acting on the upper ball joint of a riser string due to the drill ship motion and riser Tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the Tensioner sheaves while assuming vessel and upper ball joint motion to be independent. General equation for the Tensioner cable forces and for the forces exerted on the riser upper ball joint by the ship joint-Tensioner system derived in Part I are solved. The variation in the Tensioner cable forces is compared to data generated in field operation

T. J. Kozik - One of the best experts on this subject based on the ideXlab platform.

  • Upper Ball Joint Force Variations due to Riser Tensioner and Vessel Motions—Part II: Analysis and Computer Simulation
    Journal of Energy Resources Technology-transactions of The Asme, 1990
    Co-Authors: T. J. Kozik, J. E. Lowell, Atila Ertas
    Abstract:

    Part 2 of a study of upper ball joint force variations due to riser Tensioner and vessel motions. An analysis of the variation of forces acting on the upper ball joint of a riser string due to the drill ship motion and riser Tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the Tensioner sheaves while assuming vessel and upper ball joint motion to be independent. General equation for the Tensioner cable forces and for the forces exerted on the riser upper ball joint by the ship joint-Tensioner system derived in Part I are solved. The variation in the Tensioner cable forces is compared to data generated in field operation

  • Upper Ball Joint Force Variations due to Riser Tensioner and Vessel Motions—Part I: Derivation of General Equations
    Journal of Energy Resources Technology-transactions of The Asme, 1990
    Co-Authors: T. J. Kozik, J. E. Lowell, Atila Ertas
    Abstract:

    Part one of a study of upper ball joint force variations due to riser Tensioner and vessel motions. General equation for the Tensioner cable forces and for the forces exerted on the riser upper ball joint by the ship joint-Tensioner system are derived. An analysis of the variation of forces acting on the upper ball joint of a riser string due to drill ship motion and riser Tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the Tensioner sheaves while assuming vessel and upper ball joint motion to be independent

  • upper ball joint force variations due to riser Tensioner and vessel motions part i derivation of general equations
    Journal of Energy Resources Technology-transactions of The Asme, 1990
    Co-Authors: T. J. Kozik, J. E. Lowell, Atila Ertas
    Abstract:

    Part one of a study of upper ball joint force variations due to riser Tensioner and vessel motions. General equation for the Tensioner cable forces and for the forces exerted on the riser upper ball joint by the ship joint-Tensioner system are derived. An analysis of the variation of forces acting on the upper ball joint of a riser string due to drill ship motion and riser Tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the Tensioner sheaves while assuming vessel and upper ball joint motion to be independent

  • upper ball joint force variations due to riser Tensioner and vessel motions part ii analysis and computer simulation
    Journal of Energy Resources Technology-transactions of The Asme, 1990
    Co-Authors: T. J. Kozik, J. E. Lowell, Atila Ertas
    Abstract:

    Part 2 of a study of upper ball joint force variations due to riser Tensioner and vessel motions. An analysis of the variation of forces acting on the upper ball joint of a riser string due to the drill ship motion and riser Tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the Tensioner sheaves while assuming vessel and upper ball joint motion to be independent. General equation for the Tensioner cable forces and for the forces exerted on the riser upper ball joint by the ship joint-Tensioner system derived in Part I are solved. The variation in the Tensioner cable forces is compared to data generated in field operation

J. E. Lowell - One of the best experts on this subject based on the ideXlab platform.

  • Upper Ball Joint Force Variations due to Riser Tensioner and Vessel Motions—Part II: Analysis and Computer Simulation
    Journal of Energy Resources Technology-transactions of The Asme, 1990
    Co-Authors: T. J. Kozik, J. E. Lowell, Atila Ertas
    Abstract:

    Part 2 of a study of upper ball joint force variations due to riser Tensioner and vessel motions. An analysis of the variation of forces acting on the upper ball joint of a riser string due to the drill ship motion and riser Tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the Tensioner sheaves while assuming vessel and upper ball joint motion to be independent. General equation for the Tensioner cable forces and for the forces exerted on the riser upper ball joint by the ship joint-Tensioner system derived in Part I are solved. The variation in the Tensioner cable forces is compared to data generated in field operation

  • Upper Ball Joint Force Variations due to Riser Tensioner and Vessel Motions—Part I: Derivation of General Equations
    Journal of Energy Resources Technology-transactions of The Asme, 1990
    Co-Authors: T. J. Kozik, J. E. Lowell, Atila Ertas
    Abstract:

    Part one of a study of upper ball joint force variations due to riser Tensioner and vessel motions. General equation for the Tensioner cable forces and for the forces exerted on the riser upper ball joint by the ship joint-Tensioner system are derived. An analysis of the variation of forces acting on the upper ball joint of a riser string due to drill ship motion and riser Tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the Tensioner sheaves while assuming vessel and upper ball joint motion to be independent

  • upper ball joint force variations due to riser Tensioner and vessel motions part i derivation of general equations
    Journal of Energy Resources Technology-transactions of The Asme, 1990
    Co-Authors: T. J. Kozik, J. E. Lowell, Atila Ertas
    Abstract:

    Part one of a study of upper ball joint force variations due to riser Tensioner and vessel motions. General equation for the Tensioner cable forces and for the forces exerted on the riser upper ball joint by the ship joint-Tensioner system are derived. An analysis of the variation of forces acting on the upper ball joint of a riser string due to drill ship motion and riser Tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the Tensioner sheaves while assuming vessel and upper ball joint motion to be independent

  • upper ball joint force variations due to riser Tensioner and vessel motions part ii analysis and computer simulation
    Journal of Energy Resources Technology-transactions of The Asme, 1990
    Co-Authors: T. J. Kozik, J. E. Lowell, Atila Ertas
    Abstract:

    Part 2 of a study of upper ball joint force variations due to riser Tensioner and vessel motions. An analysis of the variation of forces acting on the upper ball joint of a riser string due to the drill ship motion and riser Tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the Tensioner sheaves while assuming vessel and upper ball joint motion to be independent. General equation for the Tensioner cable forces and for the forces exerted on the riser upper ball joint by the ship joint-Tensioner system derived in Part I are solved. The variation in the Tensioner cable forces is compared to data generated in field operation

Ricardo Zuccolo - One of the best experts on this subject based on the ideXlab platform.

  • top tensioned riser system design for the fhsb dry tree semisubmersible platforms
    ASME 2013 32nd International Conference on Ocean Offshore and Arctic Engineering, 2013
    Co-Authors: Jim Yu, Alaa M Mansour, Alan Yu, Ricardo Zuccolo
    Abstract:

    The dry tree production and drilling Top Tensioned Riser (TTR) systems have been extensively used with Tension Leg Platforms (TLPs) and Spar floaters in deepwater applications. However, the large heave response of the conventional Semisubmersible floaters makes this type of platforms not suitable for dry tree applications largely due to the ultra-long stroke Tensioner that would be required in this case.The Free Hanging Solid Ballast (FHSB) Semi is an innovative new semisubmersible design that is suitable for dry tree applications due to its low heave response that is comparable to that offered by Spar floaters. The new design resembles the conventional Semisubmersibles with an added free-hanging solid ballast tank placed deep below the keel of the Semisubmersible hull and connected to the hull through four groups of chains. The Solid Ballast Tank (SBT) acts as a motion damper that significantly improves the heave motion response.In this paper, the design of the dry tree TTR system for the FHSB Semi is presented. The typical GoM’s drilling and production conditions are used in designing the TTR system including the tensioning system and the interface between the SBT and the riser keel joint. The feasibility and performance of the designed TTR system are demonstrated through static and dynamic TTR analyses.Copyright © 2013 by ASME

Lixin Xu - One of the best experts on this subject based on the ideXlab platform.

  • study on key performance parameters of hydro pneumatic Tensioner for top tensioned riser
    Applied Ocean Research, 2019
    Co-Authors: Baiquan Chen, Jianxing Yu, Lixin Xu, Chen Wu, Yang Yu
    Abstract:

    Abstract In this paper an improved mathematical model of a hydro-pneumatic Tensioner (HPT) system for top tensioned riser (TTR) is derived by consideration of friction, mass of piston and piston rod, tension loss in hydraulic oil piping, and compressibility of hydraulic oil. The vertical motion of the riser string is also considered. Subsequently, the proposed detailed model and the conventional simplified model are comparatively studied. Finally, the tension characteristic and performance parameters of the HPT are analyzed based on the proposed model. Results show that the conventional simplified model indeed overestimates the tension of Tensioner as it neglects some performance parameters resulting in tension loss. The diameters of piston and piston rod and the initial pressure of high pressure (HP) gas have the most significant influence on the tension of the Tensioner. The initial volume of HP gas and the initial pressure of low pressure (LP) gas also have some impact. The influence of the initial volume of LP gas and the inner diameter and length of the piping is relatively small. The research has some reference value for HPT and TTR design.

  • Modeling Approach of Hydro-pneumatic Tensioner for Top Tensioned Riser
    Journal of Offshore Mechanics and Arctic Engineering-transactions of The Asme, 2018
    Co-Authors: Baiquan Chen, Jianxing Yu, Lixin Xu, Han Wu, Yang Yu, Zhen-mian Li
    Abstract:

    A three-dimensional (3D) finite element analysis (FEA) model of top-tensioned riser (TTR) with hydropneumatic Tensioner is proposed in this work. First, the tension calculation equation of the hydropneumatic system is derived, and the kinematic relationship of the platform–Tensioner–riser system is established. Second, a 3D FEA model is established based on the FEA code ABAQUS, considering the actual riser string configuration and the Christmas tree. At last, four kinds of Tensioner models, i.e., a constant vertical tension model, a conventional simplified model, a linear spring–damper model, and a nonlinear spring–damper model, are compared and analyzed in this study. Results show that the constant vertical tension model is not recommended as it cannot reflect the actual tension in the Tensioner and the response of the TTR. The conventional simplified model indeed overestimates the tension of Tensioner and may lead to inaccurate estimation results of the TTR response. The linear model is applicable when the environmental condition is relatively mild, but it is strongly recommended to use the nonlinear model especially in harsher environmental conditions.

  • Design Optimization of Top-Tensioned Risers for Deepwater HPHT Applications: Part II
    Volume 1: Offshore Technology; Polar and Arctic Sciences and Technology, 2011
    Co-Authors: Lixin Xu
    Abstract:

    Dry-tree solutions with top-tensioned risers (TTRs) have been successfully used with floating production systems (FPS), such as Spars and TLPs, in a wide range of deepwater applications. Both single-casing and dual-casing top-tensioned risers are field-proven in existing field developments. The top-tensioned risers can bring technical advantages and operational cost benefits. Moreover, recent oil and gas developments that have high pressure and high temperature (HPHT) in combination with severe environmental loads lead to more design challenges for steel risers in deepwater, pushing the design limits of conventional steel pipes in deepwater risers. High-strength steel pipes are therefore considered for both technical and economic reasons. The objective of the study that forms the basis for this paper is to provide top-tensioned riser system configurations that meet challenges of the extremely high operational pressure and environmental loads in deep and ultra-deep waters. Part I of the paper was published in OMAE 2010 [1], addressing strategies for top-tensioned riser sizing and weight management for HPHT applications in deep and ultra-deep waters, and also design considerations for TTR specialty joints. Part II here present spar top-tensioned risers and their support tensioning systems. The paper illustrates the HPHT riser global configuration on spar and the tensioning system performance optimization, as well as coupled motion compensation with the spar platform. The impact of riser loads on spar global performance is also discussed.

  • Design Challenges of Top Tensioned Risers in Ultra Deepwater Applications
    Volume 4: Pipeline and Riser Technology, 2011
    Co-Authors: Yongming Cheng, Lixin Xu, Paul Stanton
    Abstract:

    A Top Tensioned Riser (TTR) system provides direct access to subsea wells from a floating platform for drilling, workover, and completion operations. TTRs have been widely used with floating production systems such as Spars and TLPs in deepwater field developments. This paper investigates design challenges of TTRs in ultra deepwater applications. As application moves to ultra deepwater, challenges of TTRs increase in terms of riser design, analysis, installation and global performance. This paper first introduces a typical TTR configuration in ultra deepwater applications. The TTR design issues cover riser wall thickness which is especially driven by extreme high pressure and high temperature, tension limits, high payload, and long Tensioner stroke. The installation concerns come from hook capacity limit, riser Vortex-Induced Vibration (VIV) when the riser is disconnected, and riser bottom drift caused by vessel motion during installation. This paper further investigates the coupling between the risers and floating platform, the interference between riser pairs, riser VIV, and Tensioner stick-slip phenomenon. Examples are given to illustrate various aspects of TTRs in ultra deepwater applications. In addition, this paper also explores likely solutions to TTR design challenges.Copyright © 2011 by ASME

  • Design Optimization of Top-Tensioned Risers for Deepwater HPHT Applications: Part 1
    29th International Conference on Ocean Offshore and Arctic Engineering: Volume 5 Parts A and B, 2010
    Co-Authors: Lixin Xu, Paul Stanton
    Abstract:

    Dry-tree solutions with top-tensioned risers (TTRs) have been successfully used with floating production systems (FPS), such as Spars and TLPs, in a wide range of deepwater applications. Both single-casing and dual-casing top-tensioned risers are field-proven in existing field developments. The top-tensioned risers can bring technical advantages and operational cost benefits. Moreover, recent oil and gas developments that have high pressure and high temperature (HPHT) in combination with severe environmental loads lead to more design challenges for steel risers in deepwater, pushing the design limits of conventional steel pipes in deepwater risers. High-strength steel pipes are therefore considered for both technical and economic reasons. The objective of the study that forms the basis for this paper is to provide top-tensioned riser system configurations that meet challenges of the extremely high operational pressure and environmental loads in deep and ultra-deep waters. Part I of the paper was published in OMAE 2010 [1], addressing strategies for top-tensioned riser sizing and weight management for HPHT applications in deep and ultra-deep waters, and also design considerations for TTR specialty joints. Part II here present spar top-tensioned risers and their support tensioning systems. The paper illustrates the HPHT riser global configuration on spar and the tensioning system performance optimization, as well as coupled motion compensation with the spar platform. The impact of riser loads on spar global performance is also discussed.Copyright © 2011 by ASME