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. 13, 1982
Filed:
Feb. 27, 1980
John K Rains, Ventura, CA (US);
Larry E Reimert, Thousand Oaks, CA (US);
Vetco Offshore, Inc., Ventura, CA (US);
Abstract
A pack-off seal assembly 26 particularly suitable for use for purposes of effecting a seal between a wellhead housing 18 and a casing hanger 16. The subject pack-off seal assembly 26 is designed to be interposed between the cylindrical wall surface 18a of the wellhead housing 18 and that of a casing hanger 16 so as to be movable between a non-sealing position and a sealing position relative thereto in response to an actuating force of low torque magnitude being applied thereto. The pack-off sealing assembly 26 includes an upper metal seal 30 having downwardly extending lips 44, a lower metal seal 32 having upwardly extending lips 46, and a plurality of independent non-bonded elastomeric members 36, 38 of differing diameters suitably supported between the upper and lower metal seals 30, 32. In addition, the upper and lower metal seals 30, 32 are provided with first and second means, respectively, that are designed to be operative to insure the retrievability of the lower metal seal 32 from between the wellhead housing 18 and the casing hanger 16 should removal of the pack-off seal assembly 26 be necessitated. The latter first and second means are cooperatively associated one with another so as to be operable to establish a lost motion connection between the upper metal seal 30 and the lower metal seal 32 when the pack-off seal assembly 26 is moved in a first direction between the non-sealing and sealing positions thereof, and so as to be operable to establish a rigid connection between the upper metal seal 30 and the lower metal seal 32 when the pack-off seal assembly 26 is moved in a second direction between the non-sealing and sealing positions thereof.