RISER TECHNOLOGY FOR DEEPWATER SCIENTIFIC DRILLING IN THE 21ST CENTURY

This paper explores the possibility of using a slimline riser ( 9 5/8" OD) for scientific (non-hydrocarbon) drilling and coring in 4,000m of water. The mode of operation is described and preliminary analyses of such a riser made from different materials (steel, titanium, aluminium and composite) are presented. In 4,000m of water it is shown that one of the principal problems is the axial dynamic behaviour of the riser in the hung-off mode. Analyses show that, in such conditions, slimline risers have greatly improved behaviour compared to oil industry risers. They are also much simpler, and are an order of magnitude less massive. Mining drilling systems (3 1/2" OD) with diamond bits show great promise for improving core recovery in fractured basalt. They can be deployed through a standard drill string (5" OD) which then acts as a mini- riser. The paper shows that one of the keys to their use is a clear understanding of the axial dynamic behaviour of the mini-riser in the connected mode (connected to the seabed).

  • Supplemental Notes:
    • OMAE 1995, 14th Intl Conf on Offshore Mechanics & Arctic Engng; 18-22 June 1995; Copenhagen, Denmark. Sponsored by ASME et al. Procs. Publ by ASME, ISBN 0-7918-1307-X. Vol I, Pt B, p 271 [9 p, 9 ref, 3 tab, 6 fig]
  • Authors:
    • Sparks, C P
  • Publication Date: 1995

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00718451
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 27 1996 12:00AM