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par Admin Mar 28 Aoû - 13:22Nadia: A logging shuttle-present state of development and future evolution.
Type de document:
Acte de colloque
Date de publication:
1990-12
Langue(s):
Français
Doc(s) complet(s):
[Vous devez être inscrit et connecté pour voir ce lien] (0.74 Mo)Auteur(s):
Legrand J, Bervas J, Floury L
Conférence:
Intervention Sous-Marine ISM 90, Toulon (France), 3-5 Dec 1990
Source :
Actes de colloques. Ifremer. Brest [ACTES COLLOQ. IFREMER.]. 1991
Thème(s):
Art et Techniques de l'ingénieur
Mot-Clé(s):
ASW, Mid Atlantic Ridge, Logging, Deep sea drilling, Manned vehicles
Résumé:
In July 1988, the first re-access to a deep sea borehole was performed using the logging shuttle NADIA 1 and the manned submersible NAUTILE during the cruise FARE. This operation was conducted on the site DSDP 396 B, drilled by the Glomar Challenger within the framework of the Deep Sea Drilling Project in 1976, close to the axis of the mid Atlantic Ridge at 23 degree N. A temperature logging hole and a fluid sampler was introduced in that hole and lowered to -300 m below the sea floor. It was the first time such an operation was done without a drill string and a drilling ship equipped with a dynamic positioning system. From this experience, a new logging shuttle, NADIA 2, was developed. NADIA 1 was designed with the objective of demonstrating the feasibility of the reoccupation of a deep sea borehole. NADIA 2 is a real logging unit, able to operate most of the logging tools used in the Ocean Drilling Programme. NADIA 2 can also be used as an ocean bottom observatory with an autonomy of weeks to a few months on the sea floor.
