A system for active heave compensation and use thereof

B - Operations – Transporting – 63 – B

Patent

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B63B 35/44 (2006.01) B63B 39/00 (2006.01) E21B 19/09 (2006.01)

Patent

CA 2651606

A system for active heave compensation of the running block in a drilling derrick on board a floating off shore platform comprises a double-acting hydraulic cylinder (1) which is connected to a hydraulic power unit (3) for the supply of hydraulic pressure fluid to the hydraulic cylinder (1), a control unit (6) which regulates the supply conditions of the pressure fluid to the at any time active side (A, B) of the hydraulic cylinder, the hydraulic fluid concurrently being permitted to leave the passive side (B, A) of the hydraulic cylinder. The hydraulic power unit (3) comprises a pump unit (4) which via respective conduits (9a, 9b) are directly connected to the two sides (A, B) of the hydraulic cylinder (1) in order to form a generally closed hydraulic system therewith. The hydraulic fluid delivered by the pump unit (4) to the conduits (9a, 9b) to the active cylinder side is drawn from the conduit (9b, 9a) to the passive cylinder side, while the control unit regulates the output of the pump unit. The hydraulic system further comprises an accumulator (11) which equalizes the volumetric difference between the two sides of the hydraulic cylinder when it is a common double-acting cylinder. The system may also be provided with a hydraulic transformer (23) for regeneration of hydraulic power during passive operation of the compensation system.

Un système de compensation de pilonnement actif de l'élément mobile dans un derrick de forage embarqué sur une plateforme offshore flottante comprend un cylindre hydraulique à double action (1) qui est connecté à une unité d'alimentation haydraulique (3) destinée à fournir le fluide à pression hydraulique (1), une unité de commande (6) qui régule les conditions de fourniture du fluide de pression au côté actif à tout moment (A, B) du cylindre hydraulique, le fluide hydraulique pouvant simultanément quitter le côté passif (B, A) du cylindre hydraulique. L'unité d'alimentation hydraulique (3) comprend une unité de pompage (4) qui est reliée par l'intermédiaire de conduites respectives (9a, 9b) directement aux deux côtés (A, B) du cylindre hydraulique (1) de manière à former un système hydraulique généralement fermé. Le fluide hydraulique délivré par l'unité de pompage (4) aux conduites (9a, 9b) sur le côté du cylindre actif est extrait de la conduite (9a, 9b) sur le côté du cylindre passif, tandis que l'unité de commande régule la sortie de l'unité de pompage. Le système hydraulique comprend également un accumulateur (11) qui égalise la différence volumétrique entre les deux côtés du cylindre hydraulique lorsqu'il s'agit d'un cylindre à double action commun. Le système peut également comprendre un transformateur hydraulique (23) destiné à régénérer la puissance hydraulique pendant le fonctionnement passif du système de compensation.

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