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:
May. 24, 1983
Filed:
Sep. 25, 1981
Robert J Diehl, Wallis, TX (US);
W-K-M Wellhead Systems, Inc., Shreveport, LA (US);
Abstract
A wellhead sealing assembly comprising a metallic sealing ring (10) which is compressed and deformed by tubing hanger load and fluid pressure to establish metal-to-metal sealing contact with the tubing hanger (20) and the tubing head (30). The outer surface of the sealing ring includes an upper cylindrical surface (11) and a lower downward facing frusto-conical surface (16) which coact respectively, with the bore wall of the tubing head (30) and an upward facing frusto-conical shoulder (33) in the tubing head bore (32). It is also provided with an annular end surface (13) which is radially transverse to the ring axis and coacts with a corresponding downward facing shoulder (22) on the tubing hanger (20) which seats thereagainst. The metallic ring (10) also comprises inner annular surfaces in the form of an upward facing frusto-conical surface (15) and a lower cylindrical surface (12) which coacts respectively with a downward facing frusto-conical surface (23) and a cylindrical surface (24) on a reduced diameter section of the tubing hanger. When the tubing hanger is seated on the upper end surface (13) of the sealing ring (10), there is a 5.degree. difference in the angles of taper between the inner frusto-conical surface (15) of the sealing ring (10) and the outer frusto-conical surface (23) of the tubing hanger (20) with the two frusto-conical surfaces contacting only at their upper extremities. When compression loads are applied, the sealing ring is compressed and deformed radially to coact and establish sealing metal-to-metal contact with the bore (32) of the tubing head (30) and the external tapered and cylindrical surfaces (23, 24) of the tubing hanger 20.