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:
Aug. 30, 1994
Filed:
Sep. 27, 1993
Applicant:
Inventor:
Charles D Bridges, Cypress, TX (US);
Assignee:
ABB Vetco Gray Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166382 ; 166 751 ; 166208 ;
Abstract
An internal lockdown will lock a tubing hanger in a wellhead housing. The tubing hanger has a conical cam surface formed on the exterior. An internal profile is located in the bore of the housing in alignment with the cam surface. A landing sub secures to a threaded bore of the tubing hanger and protrudes above. A carrier ring mounts to exterior threads formed on the landing sub. The carrier ring carries a set of segmented dogs. After the tubing hanger lands, the landing sub is unscrewed relative to the tubing hanger and carrier ring assembly. Then, the landing sub is lowered, pushing the dogs out into engagement with the profile.