Holstein Truss Spar and Top Tensioned Riser System Design Challenges and Innovations

Perryman, Steve; Gebara, J.; Botros, Fikry; Yu, Alan

doi:10.4043/17292-ms

Cited by 7 publications

(2 citation statements)

References 6 publications

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“…An alternative tensioning system for Spar risers was proposed by (Finn et al, 2001) and was later implemented for the Holstein Spar design as reported by (Perryman et al, 2005) and (Smith et al, 2005). The air can supported riser system typically consists of the risers themselves, air can system, and a supporting guide frame inside the centerwell.…”

Section: Case Descriptionsmentioning

confidence: 99%

Contemporary Challenges and Solutions for Post-Katrina Gulf of Mexico Spar Design

Poll¹,

Zhou²,

Chianis³

2009

Proceedings of Offshore Technology Conference

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Deepwater field developments in the Gulf of Mexico typically consider Spar, Tension Leg Platform and Semisubmersible hull forms as potential candidates for floating facilities. Since 2005, field development studies for floating systems have had to consider more severe environmental conditions, including increased wind and wave criteria released in API Bulletin 2INT-MET in 2007, increased or more prevalent loop/eddy current events and longer wave periods. These changes have quantifiable impacts to Spar hull and mooring design that are evaluated in this paper. In addition to the design challenges presented by the environment, operator functional requirements (e.g. hull-supported top-tensioned risers), robustness requirements (e.g. minimum air gap in survival conditions) and execution plan considerations (e.g. hull dry transport constraints) also have a quantitative impact on the Spar configuration. This paper presents a summary of the recent design challenges affecting Gulf of Mexico Spar design and uses global performance analysis to evaluate different options to update the Spar configuration to effectively satisfy the design challenges. Design solutions that produce acceptable global performance results are further evaluated to quantify the potential benefit to delivery cost and schedule based on overall hull weight. Based on the analysis results, recommendations are made regarding the best solution to meet the identified post-Katrina design challenges. Results indicate that the optimum number of heave plates depends on the top-tensioned riser support system. The effect of overall hull length (a typical execution plan constraint) on overall weight (and therefore cost) for a given payload is identified. The technical solutions and recommendations are applicable to all future field developments that are considering a Spar hull concept to support floating facilities.The offshore oil industry is characterized by more challenging developments, increasing costs, and ever-increasing focus on safety and survivability. The technical conclusions and recommendations from the work discussed in this paper will assist operators that choose the Spar concept in developing more cost effective designs that retain the required robustness and survivability for safe, reliable operations. IntroductionDeepwater production of oil and gas in the Gulf of Mexico utilizes floating and subsea systems. Spar, Tension Leg Platform and Semisubmersible hull forms have been used for existing floating production systems and are typically considered for new developments. All of these hull concepts have unique features to meet the demanding functional and environmental requirements of offshore oil and gas production. As experience is gained in deepwater production, functional and environmental requirements are updated and the hull concepts must be evaluated in consideration of the updated requirements to ensure that each implementation provides a good balance of cost, function, reliability and safety.This paper specifically considers the Truss Spar c...

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Section: Case Descriptionsmentioning

confidence: 99%

Contemporary Challenges and Solutions for Post-Katrina Gulf of Mexico Spar Design

Poll¹,

Zhou²,

Chianis³

2009

Proceedings of Offshore Technology Conference

View full text Add to dashboard Cite

show abstract

“…The description and application of a RAM style top tensioned riser system on a Spar has been presented by Perryman et al (2005) and Smith et al (2005). A conventional tensioner system with a regular stroke range of 8.5m (28ft) has been employed on the Perdido Spar (Larsen, 2010).…”

Section: Introductionmentioning

confidence: 99%

VIM Model Testing and VIM Induced Mooring Fatigue of a Dry Paired-Column Semisubmersible Platform

Zou¹,

Poll²,

Antony³

et al. 2014

Day 2 Tue, May 06, 2014

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The Paired-Column Semisubmersible (PC Semi) concept was selected as a dry tree alternative for ultra-deep water development by RPSEA in 2009. Since then, RPSEA continuously supported maturation of PC Semi. The PC Semi platform has relatively deeper draft and smaller columns compared to those of a generic Deep Draft Semisubmersible (DD Semi) platform. Due to its larger column slenderness ratio, it might be suspected to have a pronounced VIM response. VIM response characteristics of a floater are the key measures of its performance. It is an essential step to explore VIM response characteristics during concept maturation. An extensive VIM model test program funded by RPSEA was performed at MARIN in June, 2013. Key results are summarized and presented in this paper.Since the VIM response of a floater (Spar or Semi) is a controlling factor for mooring fatigue, VIM induced mooring fatigue analysis was followed by employing the measured test results. A typical loop current scatter diagram for the GoM was considered and the resultant fatigue damage was analyzed and highlighted. A parallel study for VIM induced mooring fatigue of a generic dry tree DD Semi was also carried out to establish a baseline for comparison of the PC Semi response features and mooring fatigue.

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Effects of Water Inside Semiclosed Moon Pool on the Hydrodynamic Coefficients and Heaving Damping of a Truss Spar Platform

Liu

Qiu

2016

Journal of Offshore Mechanics and Arctic Engineering

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The hydrodynamic coefficients and heaving damping of a truss spar platform were studied by the computational fluid dynamics (CFD) method with considering the semiclosed moon pool. A partial model was established to investigate the added mass and viscous damping of platform heaving; a full model and a simplified model were established to study the nonlinear damping of platform heaving. The influences of opening ratios of moon pool on the added mass and viscous damping of platform heaving were analyzed. It is found that the natural period and the heaving added mass of the platform increase if the semiclosed moon pool is considered. Different opening ratios of the moon pool will lead to different heaving damping of the platform and dynamic pressure acting on the guide plate of the moon pool. In practice, an optimal opening ratio of the moon pool can be designed. The numerical results were verified by comparing with the results of model experiments.

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Holstein Truss Spar and Top Tensioned Riser System Design Challenges and Innovations

Abstract: TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe Holstein truss spar,

Cited by 7 publications

References 6 publications

Contemporary Challenges and Solutions for Post-Katrina Gulf of Mexico Spar Design

Contemporary Challenges and Solutions for Post-Katrina Gulf of Mexico Spar Design

VIM Model Testing and VIM Induced Mooring Fatigue of a Dry Paired-Column Semisubmersible Platform

Effects of Water Inside Semiclosed Moon Pool on the Hydrodynamic Coefficients and Heaving Damping of a Truss Spar Platform

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