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:
Aug. 14, 2007
Filed:
Jul. 09, 2004
Grant R. Thompson, Tulsa, OK (US);
Grant R. Thompson, Tulsa, OK (US);
Baker Hughes Incorporated, Houston, TX (US);
Abstract
A sealing system for a flow tube keeps cement from getting around it to the flapper when the safety valve is in the open position. Seals are provided at opposed ends of the flow tube so that the power spring and the flapper will not get fouled with cement pumped through the flow tube in wells that are completed through a production string with the safety valve in place. The seals may be mounted to the flow tube or the surrounding body. A unique seal construction separates cement from the flapper behind the flow tube. The force acting on the flow tube to hold the valve open also helps to apply a force against the lower seal adjacent the flapper.