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:
Nov. 04, 1997
Filed:
May. 28, 1996
Michael S Rawson, Tulsa, OK (US);
Doug Trott, Coweta, OK (US);
Mark S Megill, Tulsa, OK (US);
Clifford H Beall, Broken Arrow, OK (US);
Baker Hughes Incorporated, Houston, TX (US);
Abstract
The invention relates to a pair of matched surfaces usable in sealing a downhole subsurface safety valve. The continuous seat and the matching flapper profile feature a surface that is around its periphery transverse to the longitudinal axis of the seat and the flapper. The seating surface, if extended in a two-dimensional plane, defines an undulating shape which can be a sinusoidal shape in the preferred embodiment. The result is an improvement in the performance of the metal-to-metal contact between the seat and the flapper, coupled with a self-centering effect when the seating surface on the flapper, which is formed adjacent a shoulder, is presented in opposition to the seat. Additionally, the transverse undulating seat can have an embedded groove which accommodates a resilient seal, preferably PTFE or Teflon.RTM..