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. 30, 2009
Filed:
Dec. 05, 2006
David Z. Anderson, Glenpool, OK (US);
Edward W. Welch, Jr., Broken Arrow, OK (US);
Alan N. Wagner, Broken Arrow, OK (US);
Darren E. Bane, Broken Arrow, OK (US);
Clifford H. Beall, Broken Arrow, OK (US);
David Z. Anderson, Glenpool, OK (US);
Edward W. Welch, Jr., Broken Arrow, OK (US);
Alan N. Wagner, Broken Arrow, OK (US);
Darren E. Bane, Broken Arrow, OK (US);
Clifford H. Beall, Broken Arrow, OK (US);
Baker Hughes Incorporated, Houston, TX (US);
Abstract
A control system for a downhole tool, such as a subsurface safety valve, features an operating piston that is insensitive to tubing pressure in the valve. The hydrostatic forces from the single control line from the surface are significantly reduced with a branch line to a piston bottom that is slightly smaller than the piston top. A variable volume between piston seals is connected to a low pressure compressible fluid reservoir to permit piston movement. The piston can be modular to facilitate assembly or bore offsets in the valve body. Failsafe closure upon seal failures is contemplated.