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. 30, 2015
Filed:
Sep. 27, 2012
Agr Subsea As, Straume, NO;
Mehdi Mir Rajabi, Aberdeen, GB;
Roger Sverre Stave, Bergen, NO;
AGR SUBSEA AS, Straume, NO;
Abstract
There is provided a device and method for control of return flow from a borehole () where drill fluid is supplied from a surface rig () via a multi section drill string () to a bottom hole assembly (), the drill pipe sections () having tool joints () that include an enlarged outer diameter portion (), and where an annulus () is formed between a pipe () and the drill string (), and where the annulus () is in fluid communication with or forms part of a return path () for the drill fluid, and where a choke () is positioned in the annulus (), and where the length (L) of the choke () exceeds the distance (M) between the enlarged outer diameter portion () of two adjacent tool joints ().