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. 16, 2015
Filed:
Jan. 16, 2013
Applicant:
Agr Subsea As, Straume, NO;
Inventors:
Sigurd Ree, Loddefjord, NO;
Roger Sverre Stave, Bergen, NO;
Assignee:
AGR SUBSEA AS, Straume, NO;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 7/12 (2006.01); E21B 17/01 (2006.01); E21B 21/00 (2006.01); E21B 21/10 (2006.01);
U.S. Cl.
CPC ...
E21B 21/001 (2013.01); E21B 7/12 (2013.01); E21B 17/01 (2013.01); E21B 21/10 (2013.01);
Abstract
Boost system and method for dual gradient drilling where a marine riser () has a mud return line () connected at a first connection position () below the lowest foreseeable mud level () in the marine riser (), and where a mud return pump () is connected to the mud return line (), and where a recirculation line () that has a recirculation pump (), is connected to the marine riser () at a second connection position () below the lowest foreseeable mud level () in the marine riser (), and at a third connection position () on the marine riser () below said second connection position ().