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:
May. 05, 2015
Filed:
Feb. 22, 2011
Sven Krueger, Niedersachsen, DE;
Volker Krueger, Celle, DE;
Jens-uwe Bruns, Niedersachsen, DE;
Karsten Fuhst, Hannover, DE;
Joerg Breitenfeld, Celle, DE;
Sven Krueger, Niedersachsen, DE;
Volker Krueger, Celle, DE;
Jens-Uwe Bruns, Niedersachsen, DE;
Karsten Fuhst, Hannover, DE;
Joerg Breitenfeld, Celle, DE;
Baker Hughes Incorporated, Houston, TX (US);
Abstract
In one aspect, an apparatus for drilling a wellbore into an earth formation is disclosed, which apparatus, according to one embodiment, may include a drill string configured to be conveyed into a wellbore, wherein an annulus is formed between the drill string and a wellbore wall, a first flow device configured to circulate a first fluid from an annulus to a bore of the drill string, and a second flow device positioned downhole of the first flow device, the second flow device configured to circulate a second fluid from the bore of the drill string to the annulus.