BROENNHODE-KONSTRUKSJON

An improved wellhead structure having a housing (12) with an internal landing seat (18) to receive the landing shoulder (20) on a hanger (22) having a bore (30) with a counterbore (32) below the bore and a shoulder (34) therebetween. A hanger mandrel (48,60) positioned within the counterbore (32) an...

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Bibliographische Detailangaben
Hauptverfasser:	SMITH, JERRY D, HARTMANN, MICHAEL P
Format:	Patent
Sprache:	nor
Schlagworte:	BLASTING EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING ENGINEERING ELEMENTS AND UNITS FIXED CONSTRUCTIONS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING JOINTS OR FITTINGS FOR PIPES LIGHTING MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PIPES SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	An improved wellhead structure having a housing (12) with an internal landing seat (18) to receive the landing shoulder (20) on a hanger (22) having a bore (30) with a counterbore (32) below the bore and a shoulder (34) therebetween. A hanger mandrel (48,60) positioned within the counterbore (32) and has an external flange (50) having a diameter less than the diameter of the counterbore. A first bushing (54) is positioned above the mandrel flange (50) and in engagement with the shoulder within the hanger counterbore, and a second bushing (56) is positioned within the counterbore below the mandrel flange. A support sleeve (42) is positioned within the hanger in supporting relationship to the second bushing (56). The bushings (54,56) are of an electrical insulating material and sized to retain the mandrel in spaced relationship with respect to the 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.