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:
Mar. 13, 2012
Filed:
Mar. 29, 2007
Sven Krueger, Winsen/Aller, DE;
Volker Krueger, Celle, DE;
Jens Bruns, Niedersachsen, DE;
Roger Fincher, Conroe, TX (US);
Larry Watkins, Houston, TX (US);
Peter Aronstam, Houston, TX (US);
Peter Fontana, Buenos Aires, AR;
Sven Krueger, Winsen/Aller, DE;
Volker Krueger, Celle, DE;
Jens Bruns, Niedersachsen, DE;
Roger Fincher, Conroe, TX (US);
Larry Watkins, Houston, TX (US);
Peter Aronstam, Houston, TX (US);
Peter Fontana, Buenos Aires, AR;
Baker Hughes Incorporated, Houston, TX (US);
Abstract
A system for reverse circulation in a wellbore includes equipment for supplying drilling fluid into the wellbore bit via at least an annulus of the wellbore and returning the drilling fluid to a surface location via at least a bore of a wellbore tubular. The system also includes devices for controlling the annulus pressure associated with this reverse circulation. An active pressure differential device may increase the pressure wellbore annulus to at least partially offset a circulating pressure loss. Alternatively, the system may include devices for decreasing the pressure in the annulus of the wellbore.