This paper describes the successful field test of the NADIA (Navette de Diagraphie, which means logging shuttle) wireline reentry system, an apparatus designed and built by IFREMER (Institut Francaise de Recherche pour l'Exploitation de la Mer) to place instruments and to carry out well logging in boreholes in the deep sea without a drill ship. The Campagne FARE (Faisabilite Re‐Entree) field tests in July 1988 in DSDP (Deep Sea Drilling Project) Hole 396B (near the Kane Fracture Zone at the Mid‐Atlantic Ridge (Figure 1)) demonstrated the feasibility of routine reentry and logging in a water depth of 4455 m.
NAD~A is a system developped to complete re-entry operations in deep sea boreholes, drilled for twenty years by the drilling vessels Glomar Challenger and JOIDES Resolution.NADIA is operated by a manned submersible at water depth of up to 6000 m, with a capability of lowering instruments in holes of 1000 m of penetration. This paper describes the system and re-entry operations, with some technical details about specific equipments developped within the project NADIA.The work to be cqmpleted during the upcoming cruise FARE is described. Then, a programme plan of development, following FARE is briefly exposed.The first trials at sea were completed successfully in 2300 m of water in the Mediterranean Sea. Operations in DSDP Hole 396 B will be conducted in July and August 1988.
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