E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 19/09 (2006.01) E21B 19/00 (2006.01)
Patent
CA 2445302
An arrangement for transferring loads by means of one or more hydraulic cylinder-like actuators (19, 26, 40) in order to establish and maintain tension in a riser (1) of the type typically used in offshore petroleum production, where the riser (1) constitutes a connection between the sea bed (2) and an installation (4) on or near the surface of the sea (6), and where the required pressure difference between the pressure side(s) (18, 42) and the depressurised side(s) (17, 46) of the actuator(s) (19, 29, 40) is constituted by a hydrostatic pressure difference.
L'invention concerne un assemblage de transfert de charges au moyen d'un ou de plusieurs actionneur (s) (19, 26, 40) hydraulique(s) en forme de cylindre en vue d'établir et de maintenir une tension dans un tube ascenseur (1) de type habituellement employé dans la production de pétrole au large. Le tube ascenseur (1) constitue une connexion entre le fond des mer (2) et une installation (4) sur ou près de la surface de la mer (6) et où la différence de pression requise entre le/les côté(s) sous pression (18, 42) et le/les côté(s) sans pression (17, 46) de(s) actionneur (s) (19, 26, 40) est obtenue par une différence de pression hydrostatique.
National Oilwell Norway As
Ridout & Maybee Llp
LandOfFree
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