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:
Sep. 17, 1985
Filed:
Aug. 29, 1984
John V Salerni, Kingwood, TX (US);
James R Zachman, The Woodlands, TX (US);
Baker Oil Tools, Inc., Orange, CA (US);
Abstract
An apparatus for gravel packing a screen positioned adjacent the casing perforations of a subterranean well incorporates an annular sealing surface immediately above the gravel pack screen. A flapper valve is mounted for movement about a horizontal pivot axis into engagement with the annular valve seat. The flapper valve and the cooperating valve seat are both provided with spherical segment sealing surfaces so as to prevent leakage through the valve due to any misalignment of the pivot axis of the flapper valve with respect to the annular valve seat. With this apparatus, the withdrawal of the gravel packing apparatus at the completion of the gravel packing operations prevents the entry of undesired fluids and contaminates into the producing formation.