Patent ID: 7210525

Claim:
An apparatus for controlling vertical movement of a tubular within a wellbore, the apparatus comprising: an anchor spool including a bottom flange for fluid-tight connection atop a wellhead of the wellbore, a top end that supports a high-pressure packing that seals an annulus between the top end and the tubular while permitting vertical and rotational movement of the tubular, and an anchor plate having connectors for detachably securing ends of at least two hydraulic cylinders symmetrically disposed about the anchor spool; and a detachable superstructure including the at least two hydraulic cylinders and a tool support structure connected to respective opposite ends of the at least two hydraulic cylinders, the tool support structure comprising a control plate having a top side, and a bottom side, and including a fluid passage extending between the top and bottom sides, a universal adapter connected to the top side of the control plate in fluid communication with the fluid passage, and a union adapter connected to the bottom side for secure connection to the tubular, either directly or via at least one of a swivel joint, a tool including the tubular, and an adapter for connecting to the tubular, so that activation of the hydraulic cylinders causes vertical movement of the tubular within the wellbore.