Patent ID: 8162062

Claim:
A motion compensating apparatus, comprising: an outer frame having an upper section for attachment to an elevator assembly of an offshore drilling or production rig floating on a surface of a body of water; an inner frame in sliding cooperation with said outer frame, said inner frame including opposing side legs; a first and second pair of compensation cylinders operatively associated with said outer frame and detachably affixed to said inner frame, wherein one of the opposing side legs is positioned between the first pair of compensation cylinders and the other opposing side leg is positioned between the second pair of compensation cylinders; a capturing assembly detachably connected to said inner frame, said capturing assembly capable of supporting a well intervention equipment connected to a well; wherein said first and second pairs of compensation cylinders are activated to an extended or retracted position to maintain the vertical position of said well intervention equipment despite the rise or fall of said surface of said body of water.