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:
Nov. 26, 2013
Filed:
Aug. 14, 2008
Applicant:
Per Olav Haughom, Tonstad, NO;
Inventor:
Per Olav Haughom, Tonstad, NO;
Assignee:
Baker Hughes Incorporated, Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 21/01 (2006.01);
U.S. Cl.
CPC ...
Abstract
An apparatus for maintaining constant circulation of drilling fluid includes a valve section () at the top of each section of drill pipes to be connected to or removed from the drill string. The valve section () has a top inlet for axial circulation and a side inlet () for radial circulation. Two separate valves () within the valve section controls flow through the inlets. An external valve control device () has a circulation adapter () for connecting drill fluid at operational pressure to the side inlet () and separate activating adapters () connecting to the couplings for opening or closing the valves ().