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Hysteretic damping of soils for well conductor fatigue analysis
Abstract The fatigue assessment of a well conductor is a critical design task during offshore exploration and development of hydrocarbons. In recent years, major progress has been made towards the modelling of soil-conductor interaction. Upgraded soil-conductor interaction springs (i.e., p-y curves) and damping models are developed and are gaining acceptance by the industry. However, there is a general lack of simplified procedures to incorporate the soil damping into the time-domain structural analysis of a wellhead system. Thus, the motivation of this paper is to close this gap by proposing a simplified procedure for incorporating the soil damping in the well conductor time domain analysis. The procedure is generic and allows for convenient adoption of alterative p-y spring and damping models. Design charts for equivalent soil system damping ratio versus the lateral deflection of the conductor are developed through parametric analyses based on representative wellhead configurations with typical soil strength profiles in the Gulf of Mexico to facilitate practical design.
Highlights A simplified procedure for incorporating the soil damping in time domain analysis of well conductors. Design charts are developed for representative wellhead configurations and soil strength profiles in the Gulf of Mexico.
Hysteretic damping of soils for well conductor fatigue analysis
Abstract The fatigue assessment of a well conductor is a critical design task during offshore exploration and development of hydrocarbons. In recent years, major progress has been made towards the modelling of soil-conductor interaction. Upgraded soil-conductor interaction springs (i.e., p-y curves) and damping models are developed and are gaining acceptance by the industry. However, there is a general lack of simplified procedures to incorporate the soil damping into the time-domain structural analysis of a wellhead system. Thus, the motivation of this paper is to close this gap by proposing a simplified procedure for incorporating the soil damping in the well conductor time domain analysis. The procedure is generic and allows for convenient adoption of alterative p-y spring and damping models. Design charts for equivalent soil system damping ratio versus the lateral deflection of the conductor are developed through parametric analyses based on representative wellhead configurations with typical soil strength profiles in the Gulf of Mexico to facilitate practical design.
Highlights A simplified procedure for incorporating the soil damping in time domain analysis of well conductors. Design charts are developed for representative wellhead configurations and soil strength profiles in the Gulf of Mexico.
Hysteretic damping of soils for well conductor fatigue analysis
Zhang, Youhu (author) / Chen, Jinbo (author) / Hu, Shuang (author) / Zhang, Heping (author) / Kaynia, Amir M. (author)
Marine Structures ; 89
2023-01-27
Article (Journal)
Electronic Resource
English
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