Patent ID: 8528650

Claim:
A mandrel casing hanger and running tool system, comprising: a mandrel casing hanger having an upper and a lower end, an annular shaped flange and a set of internal threads disposed adjacent the lower end of the mandrel casing hanger, the set of internal threads adapted to receive a threaded end of a length of casing, and a set of external threads disposed on the mandrel casing hanger and above the flange; a running tool having an upper and a lower end, including an annular shaped housing disposed at the lower end of the running tool, a set of internal threads disposed within the lower end of the running tool, the set of internal threads of the running tool being releaseably engaged with the external set of threads of the mandrel casing hanger when the mandrel casing hanger is received within the running tool, to provide a threaded connection between the running tool and the mandrel casing hanger; and a selectively engageable connection between the mandrel casing hanger and the running tool, whereby upon rotation of the mandrel casing hanger and running tool in a first direction, the length of casing may be rotated without any substantial tightening of the threaded connection between the running tool and the mandrel casing hanger, and upon rotation of the running tool in a second direction, the threaded connection between the running tool and the mandrel casing hanger is disengaged.