The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 1990
Filed:
Feb. 06, 1989
Lionel J Milberger, Houston, TX (US);
Herman O Henderson, Jr, Houston, TX (US);
Vetco Gray Inc., Houston, TX (US);
Abstract
A supporting mechanism for a casing hanger improves the load withstanding ability. The casing hanger is located in a wellhead housing. A recess is formed in the bore of the wellhead housing with an upward facing shoulder extending into the bore. An insert ring is stationarily and rigidly mounted in this recess. The insert ring has a load shoulder on its upper side. The load shoulder of the insert ring is considerably less in width than the recess shoulder. However, the insert ring has a greater hardness to increase the capacity of the insert ring. The casing hanger has an exterior load ring that lands on the insert ring. The load ring has threads which are cut to have clearances initially between the load flanks. A clearance also exists between the upper end of the load ring and a downward facing shoulder on the casing hanger. A protuberance on the upper end of the load ring maintains this upper clearance until the load flank clearances close up, then allows the upper clearance to close up to assure loading through the flanks.