Review of Dry Tree Well Conductor Tensioning for a Deep Draft Semi-Submersible

Offshore Symposium
February 1999
H. Howells - 2H. F. Gaubil, P. Thomas - Technip. C. Hough - TPG

This paper reports the results of a study of the hydrodynamic motions and well conductor stresses for the TPG 3300 deep draft semi-submersible (DDSS) in 1300m water depth and the harsh environment West of Shetland.  The motions of the unit are such that under these conditions rigid well conductors, and hence dry trees, can be used. It is therefore suitable for dry tree well completions in other environment locations such as West Africa, Gulf. of Mexico and Brazil. It is also demonstrated that the top tensioning of the well conductors is viable for a DDSS in these conditions, and therefore, other less severe locations. An alternative buoyancy can design is also presented.

The work is part of a BP Amoco sponsored three phase development programme performed by Technip-Geoproduction, (TPG).  The ongoing third phase is being funded by BP, Amoco, Statoil and TPG, and includes the services of 2H for riser analysis and Pride Foramer/Horwell for review of drilling operations.

This paper presents:

  • An outline of description of the TPG 3300 DDSS
  • a discussion of some of the key features to be considered in designing a floating dry tree facility for a harsh environment
  •  the results of the analysis of of top tensioned well conductors
  • a discussion of an alternative conductor tensioning method for a DDSS

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