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. 21, 2016
Filed:
Jul. 07, 2011
James William Weir, Houston, TX (US);
Andrew Shelton, Houston, TX (US);
James William Weir, Houston, TX (US);
Andrew Shelton, Houston, TX (US);
National Oilwell Varco, L.P., Houston, TX (US);
Abstract
Techniques for continuously circulating fluid into a drill string are disclosed. These techniques involve a circulation sub () including a tubular and a diverter valve (A). The tubular has a first end connectable to the drill string, a second end connectable to a pipe segment, and a port () therein. The tubular has a fluid path () for allowing the fluid to flow from the pipe segment to the drill string and a circulation path () for allowing the fluid to flow from the port to the drill string. The diverter valve has a channel therethrough in selective fluid communication with the fluid path. The diverter valve is positionable between a flow through position for selectively allowing the fluid to flow through the fluid path and a diversion position for selectively allowing the fluid to flow through the circulation path whereby the fluid may continuously flow through the drill string.