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. 11, 2000
Filed:
Jun. 03, 1998
A Glen Edwards, Hockley, TX (US);
Klaus B Huber, Sugar Land, TX (US);
Charles van Petegm, Velserbroek, NL;
James W Babineau, Newton, MA (US);
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
A shut-off valve is disclosed for use in a downhole string of tools in a well. The valve has a housing adapted to be connected between adjacent tools of the string, defining a bore and a passage for hydraulic communication between the adjacent tools. The passage is arranged to intersect the bore, and a piston is slidably disposed within the bore and arranged to block hydraulic communication between the passage and the piston bore. The piston is further arranged to, in a first position, permit hydraulic communication along the passage, and to, in a second position, block hydraulic communication along the passage. The piston also has a bore for ballistic communication between the adjacent tools, such that it can be employed between a firing head and a gun, for instance. Some embodiments also permit circulation flow from the tubing to the well bore after the valve has closed. Methods of use and tool strings containing such valves are also disclosed.