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. 10, 2002
Filed:
Mar. 14, 2001
Applicant:
Inventor:
Floyd R. Simonds, Richardson, TX (US);
Assignee:
Halliburton Energy Services, Inc., Dallas, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 3/410 ; E21B 3/414 ; E21B 3/406 ;
U.S. Cl.
CPC ...
E21B 3/410 ; E21B 3/414 ; E21B 3/406 ;
Abstract
A method is provided for controlling operation of a subsurface hydraulically operated well tool. In a described embodiment, a surface controlled subsurface safety valve is controlled utilizing two control lines. The control lines are hydraulically connected to respective ones of two pistons in the safety valve. Pressure applied to either of the two pistons is capable of independently operating the safety valve. In normal operation, pressure is applied to both of the pistons. However, when a failure occurs in one of the control lines, the other may still be used to operate the safety valve.