Patent ID: 7950466

Claim:
A wellhead system, comprising: a tubing head having an upper end, a lower end, a bore extending from the upper end to the lower end of the tubing head, and a first set of threads disposed on an outer surface of the tubing head; a tubing hanger disposed in the bore of the tubing head; at least one casing head having an upper end, a lower end, a bore extending from the upper end to the lower end of the casing head, and a second set of threads disposed on an outer surface of the at least one casing head; a casing hanger disposed in the bore of the at least one casing head; and at least one connector which releasably connects the tubing head to the at least one casing head, the at least one connector including a member having an interior surface which threadedly engages at least a portion of the first and second sets of threads on the tubing head and the at least one casing head, the interior surface of the at least one connector including a set of left-hand threads and a set of right-hand threads.