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Coupled wave motions on a tension leg platform and tender-assisted drilling

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Abstract

Tender-assisted drilling (TAD) has been revealed as an efficient and effective solution in deep water installations to support drilling operations of tendon leg platforms (TLP). Although this concept is new in offshore Brazil, this has been used for more than 30 years not only in the Southeast Asia but also in the Gulf of Mexico, West Africa, and the North Sea. Due to the complex scenario of two floaters moored in close proximity, an extensive and careful hydrodynamic analysis is required to guarantee a successful execution. This work presents a numerical study of coupled wave motions on the TLP–TAD multibody system with the aim of investigating first-order loads, mean drift loads, and wave frequency responses using frequency and time domain approaches. Hydrodynamic coefficients were calculated by the 3D diffraction–radiation panel method; the mooring systems and the mechanical connection between the floaters were modeled through stiffness matrixes. In frequency domain analysis, several relative positions between the floaters were considered. On the other hand, in time domain studies, the finite element method (FEM) was used to represent moored systems and mechanical connections between the floaters. FEM allows the inclusion of drag forces, added mass, and interactions between mooring lines and floaters into the nonlinear dynamic simulations.

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Acknowledgements

This work is a joint effort between Wave Current Laboratory LOC – COPPE/UFRJ and Keppel Offshore & Marine Technology Center KOMTech.

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Authors and Affiliations

  1. BrasFELS, Rio de Janeiro, Brazil

    Miguel A. M. Ramirez

  2. LOC – COPPE/UFRJ, Rio de Janeiro, Brazil

    Antonio Carlos Fernandes

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  1. Miguel A. M. Ramirez
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  2. Antonio Carlos Fernandes
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Correspondence to Miguel A. M. Ramirez.

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Ramirez, M.A.M., Fernandes, A.C. Coupled wave motions on a tension leg platform and tender-assisted drilling. Mar Syst Ocean Technol 12, 150–165 (2017). https://doi.org/10.1007/s40868-017-0031-5

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  • DOI: https://doi.org/10.1007/s40868-017-0031-5

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