INSULATING SUPPORT FOR TUBING STRING

摘要

An improved wellhead structure having a housing with an internal landing seat to receive the landing shoulder on a hanger having a bore with a counterbore below the bore and a shoulder between, a hanger mandrel positioned within the counterbore and having an external flange having a diameter less than the diameter of the counterbore, a first bushing positioned above the mandrel flange and in engagement with said shoulder within the hanger counterbore, a second bushing positioned within the counterbore below said mandrel flange, and a support sleeve positioned within said hanger in supporting relationship to said second bushing, said bushings being of an electrical insulating material and sized to retain said mandrel in spaced relationship with respect to said hanger to prevent electrical connection therebetween. This structure also is used for supporting and sealing a tubing string or a section of a tubing string in a well while electrically insulating the section from the remainder of the string.