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:
Aug. 19, 2003
Filed:
Jul. 02, 2001
Applicant:
Inventors:
Egil Sunde, Sandnes, NO;
Per Olaf Haughom, Tonstad, NO;
Assignee:
Den Norske Stats Oljeselskap A.S., Stavanger, NO;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 4/02 ; E21B 7/00 ;
U.S. Cl.
CPC ...
E21B 4/02 ; E21B 7/00 ;
Abstract
A down hole motor assembly includes a hydraulic drive portion, a drill bit operatively connected to the drive portion and a disengage mechanism ( ) arranged to disengage drive to the drill bit. The disengage mechanism ( ) is arranged to be actuated by supplying drilling fluid to the drive portion at a flow rate which is greater than the flow rate at which fluid is supplied to run the drive portion during normal drilling. The disengage mechanism is arranged to be re-set so that drive is reconnected to the drill bit when the fluid supply to the drive portion is shut off.