Patent · US Active

Reverse circulation apparatus and methods of using same

US9022146B2 · kind B2 · utility

8Cited by

8References

15Claims

0Family size

Assignee

Baker Hughes Holdings LLC · US

Inventors

Sven Krueger · Trossingen, DE
Volker Krueger · Celle, DE
Jens-Uwe Bruns · Burgdorf, DE
Karsten Fuhst · Hannover, DE
Joerg Breitenfeld · Celle, DE

Key dates

Filing date	Feb 22, 2011
Grant date	May 5, 2015
Priority date	—
Expiry date	Jan 30, 2033

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B21/08
WIPO fieldCivil engineering
WIPO sectorOther fields

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.