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:
Jul. 27, 2010
Filed:
Aug. 23, 2007
David Z. Anderson, Glenpool, OK (US);
Darren E. Bane, Broken Arrow, OK (US);
Alan N. Wagner, Broken Arrow, OK (US);
John E. Gunnells, Broken Arrow, OK (US);
Anthony S. Coghill, Tulsa, OK (US);
Allen P. Carney, Tulsa, OK (US);
Barry Lee Brown, Tulsa, OK (US);
Troy L. Smith, Tulsa, OK (US);
Jeremy R. Johnson, Tulsa, OK (US);
David Z. Anderson, Glenpool, OK (US);
Darren E. Bane, Broken Arrow, OK (US);
Alan N. Wagner, Broken Arrow, OK (US);
John E. Gunnells, Broken Arrow, OK (US);
Anthony S. Coghill, Tulsa, OK (US);
Allen P. Carney, Tulsa, OK (US);
Barry Lee Brown, Tulsa, OK (US);
Troy L. Smith, Tulsa, OK (US);
Jeremy R. Johnson, Tulsa, OK (US);
Baker Hughes Incorporated, Houston, TX (US);
Abstract
A system is provided for switching between redundant control systems for a subsurface safety valve (SSV) while being able to isolate the closure spring from hydrostatic pressure in the control line of the system that is not being used. There are two control lines that connect to discrete operating pistons that are both coupled to the flow tube. Each operating piston is connected to a control rod with the control rods terminating near opposed ends of a pivoting member. Pushing down on one rod pushes up on the other rod so that the other rod is held supported and the hydrostatic pressure in its associated control line doesn't affect the force needed by the closure spring to close the SSV. Releasing control line pressure puts the system in neutral to allow either of the systems to be reselected.