Patent ID: 8590626

Claim:
A motion compensating apparatus for use with a floating platform, comprising: a downward facing, U-shaped upper frame having opposing, spaced apart side walls, each side wall having a distal end with an opening formed between the opposing distal ends of the side walls; a downward facing, U-shaped lower frame having opposing, spaced apart legs, each leg having a distal end with an opening formed between the opposing distal ends of the legs; a compensation cylinder detachably affixed to said lower frame and arranged for coaxially translating said lower frame with respect to said upper frame; a capturing assembly pivotally coupled to at least one of the legs of said lower frame and arranged for carrying an intervention tool; wherein said lower frame is slidingly captured by said upper frame independently of said compensation cylinder and said compensation cylinder is extendable and retractable with the retraction and extension of the lower frame relative to the upper frame so as to maintain a vertical position of said intervention tool with respect to a well despite heaving of said floating platform.