Patent ID: 7392864

Claim:
A slip spool for selectively supporting or snubbing a tubing string suspended in a wellbore under pressure, the slip spool comprising: a slip spool body adapted to be mounted to a wellhead, the slip spool body having an axial passage that is aligned with the wellbore for permitting the tubing string to extend therethrough, at least two opposed radial passages extending through a side wall of the slip spool and communicating with the axial passage, and a slip bowl formed in a bottom of the axial passage; at least two opposed slip block assemblies slidably supported within the respective opposed radial passages and movable from a cached position in which the slip block assemblies clear the axial passage and an engaged position in which the slip block assemblies are seated in the slip bowl; and mechanisms that displace the respective slip block assemblies from the cached position to the engaged position, and from the engaged position to the cached position.