Riser control device with vertical actuator

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/064 (2006.01) E21B 29/12 (2006.01)

Patent

CA 2474028

Riser control device, particularly designed to be used in connection with spool or horizontal production trees (12) for wells in sub-sea oil and gas installations. Within a housing (1, 2) of the device is provided, in opposed direction, radially movable pair of rams (6) for isolating (sealing off) the well and simultaniously, in opposed direction radially movable pair of shear blades (7) for cutting off an intervention string or the like. The rams (6) and blades (7) are driven by means of a within the housing (1, 2) vertically provided actuator (8, 9, 23). The actuator may be in the form of a hydralically driven annulor piston (23) / annular chamber (29, 30) device, which via piston rods (14) and translation beams (8) transforms the movement of the piston (23) to open or close the rams (6) and shear blades (7).

L'invention concerne un dispositif de commande de colonne montante, destiné en particulier à être utilisé en relation avec une manchette ou des arbres de production horizontaux (12) pour des puits de forage dans des installations sous-marines d'extraction de pétrole et de gaz. Ce dispositif comprend une enveloppe (1, 2) renfermant une paire de mâchoires (6), mobiles radialement en sens inverse, pour isoler (obturer) le puits, ainsi qu'une paire de lames (7), mobiles radialement en sens inverse, pour découper une tige d'intervention ou similaire. Les mâchoires (6) et les lames (7) sont entraînées au moyen d'un actionneur (8, 9, 23) disposé verticalement dans l'enveloppe (1, 2). Cet actionneur peut se présenter sous la forme d'un dispositif à piston hydraulique annulaire (23) / chambre annulaire (29, 30) qui, par l'intermédiaire de tiges de piston (14) et de poutres de translation (8), transforme le mouvement du piston (23) pour ouvrir ou fermer les mâchoires (6) et les lames (7).

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