engin de forage flottant

CONT: Le principe même [des plateformes autoélévatrices] limite leurs performances: les plus récentes, dont les piles dépassent les 100 mètres peuvent forer par 90 mètres d'eau. Au-delà de cette profondeur, on utilise des engins de forage flottants, navires ou plateformes semi-submersibles.

CONT: ... floating drilling vessels [include] the two surface-type mobile units, i.e., the ship and barge units, and the column-stabilized or semi-submersible units.
CONT: Drilling vessels that are essentially of ship or barge type, of normal configuration and proportions, and which operate in all conditions as typical surface displacement vessels, are to have scantlings that meet the requirements of ""Rules for Building and Classing Steel Vessels"" or ""Rules for Building and Classing Steel Barges for Offshore Service"" of current issue. Additional consideration for unusual loadings due to drilling operations, mooring, etc., and for unusual configurations such as catamarans, outriggers, etc., will be specially considered ...
CONT: The E-Z tree is a valve-latch assembly landed in the B.O.P. stack to form a temporary production tree during offshore tests carried out from a floating drilling vessel.