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:
Jun. 01, 2004
Filed:
May. 20, 2002
Applicant:
Inventors:
Denzal Wayne Van Winkle, Santa Maria, CA (US);
Andrew Campbell, Fettercairn, GB;
Assignee:
Varco I/P, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 3/303 ;
U.S. Cl.
CPC ...
E21B 3/303 ;
Abstract
A spring-loaded check valve, mounted between a coiled tubing stripper and a BOP stack seals well bore pressure from the atmosphere when the coiled tubing is removed from the well bore. When no coiled tubing is in use, the check valve is shut against well bore pressure. When coiled tubing is inserted through the stripper and before the coiled tubing enters the BOP stack, the coiled tubing butts against the check valve and opens it, permitting insertion of the coiled tubing.