E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 19/09 (2006.01) E21B 19/00 (2006.01) E21B 19/08 (2006.01) E21B 33/043 (2006.01)
Patent
CA 2506583
A tensioning device (15) for a riser (5) connecting a subsea borehole (7) with a floating installation (1) on the surface of the sea (11), where the tensioning device (15) is provided with telescoping tubes (27, 27') and also several evenly spaced hydraulic cylinders (31, 31') arranged in a peripherally encircling manner and mainly in the longitudinal direction of the riser, and where the tension in the riser is exerted through hydraulic pressure in said cylinder (31, 31'), the tensioning device (15) consisting of two successive, interconnected telescopic tensioning units (23, 25), the tensioning units (23, 25) being designed separately to maintain a prescribed tension in the riser (5).
L'invention concerne un dispositif de tensionnement (15) pour un tube ascenseur (5) relié à un puits de forage sous-marin (7) doté d'une installation flottante (1) à la surface de la mer (11). Le dispositif de tensionnement (15) est doté de tubes télescopiques (27, 27') et également de plusieurs cylindres hydrauliques régulièrement espacés (31, 31') agencés de manière à encercler périphériquement, et principalement dans la direction longitudinale, un tube ascenseur. La tension du tube ascenseur s'exerce par une pression hydraulique dans ledit cylindre (31, 31'). Le dispositif de tensionnement (15) est constitué de deux unités (23, 25) de tensionnement télescopiques interconnectées successives. Ces unités de tensionnement (23, 25) sont conçues séparément pour maintenir une tension prescrite dans un tube ascenseur (5).
National Oilwell Norway As
Ridout & Maybee Llp
LandOfFree
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