Patent ID: 6929071
Filing Date: 2005-08-16
Classification: E21B

Abstract:
1. A motion compensating apparatus for a floating platform on an ocean, wherein a riser extends from the ocean floor through the floating platform, the apparatus comprising: a spacer attached to the floating platform; a frame member operatively attached to said spacer; a deck slidably attached to said frame member, and wherein said riser extends through said deck; moving means, connected to said frame member and said deck, for moving said frame member relative to said deck, and wherein said moving means comprises a cylinder member operatively attached to said frame member and a piston operatively attached to said deck; energizing means for energizing said cylinder member so that said cylinder extends from said piston thereby moving said frame member; a track stack member that is attached to said deck; and, wherein said riser is operatively attached to said track stack member so that said deck is also attached to said riser.