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:
Oct. 04, 1983
Filed:
Dec. 22, 1980
John H Fowler, Houston, TX (US);
Smith International, Inc., Newport Beach, CA (US);
Abstract
A sealing assembly is releasably disposed on a hanger suspending a string of casing or tubing into a well. A shoulder on the hanger engages a seat in the bore of the wellhead and has passages therethrough for connecting the annular spaces above and below the seat. The seal assembly is lowered into the upper annular space around the hanger to close the annulus. The assembly includes a first tubular body threadingly connectable to the hanger, an outer load ring, an inner load ring, an inner packing ring disposed between the outer load ring and inner load ring, an inner retainer ring, and an outer packing ring disposed between the inner load ring and retainer ring. The inner packing ring singly engages the hanger and the outer packing ring singly engages the head. Such sealing occurs in series. The entire sealing force is applied through the outer diameter and inner diameter seal elements with the lower seal being loaded first. Even when one seal assembly is fully compressed, compression of the other seal assembly may continue.