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:
Dec. 26, 2000
Filed:
Jan. 07, 1999
Applicant:
Inventors:
Denzal Wayne Van Winkle, Santa Maria, CA (US);
David McWhorter, Magnolia, TX (US);
Assignee:
Tuboscope I/P, Inc., Conroe, TX (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
251-13 ; 277325 ; 166 854 ; 137112 ;
Abstract
A shuttle valve assembly in a ram-type BOP selectively connects the volume behind the rams to the more highly pressurized wellbore volume adjacent to the rams (either above or below the rams). The connection made is free flowing in both directions (no check valves) allowing for evacuation and fluctuations with changes in wellbore pressure.