Patent ID: 7740061

Claim:
A wellhead apparatus having an external sealing apparatus for clamping a wearbushing within a tubing member of larger internal diameter, the apparatus comprising a. a wearbushing having a first diameter with a sealing zone defined thereon; b. tubing hanger releasably secured to the wearbushing; c. an inner tubing member secured to the tubing hanger; d. an outer tubing member having an inner circumferential wall with a sealing zone therein, wherein the wearbushing is positioned substantially concentrically within the outer tubing member having an outer circumferential wall with a sealing zone therein; and e. a compression system mounted outwardly of the outer tubing member adjacent the sealing zones and operable for compressing the outer tubing member into circumferential contact with the wearbushing for engaging the sealing zones thereof, wherein the sealing zone is a metal sealing surface on said wearbushing and said outer tubing member for defining a circumferential metal-to-metal seal when the compressions system is activated.