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:
Nov. 06, 2007
Filed:
Sep. 09, 2005
Applicants:
Benoit Amaudric Du Chaffaut, Voisin le Bretonneux, FR;
Christian Wittrisch, Rueil Malmaison, FR;
Inventors:
Benoit Amaudric Du Chaffaut, Voisin le Bretonneux, FR;
Christian Wittrisch, Rueil Malmaison, FR;
Assignee:
Institut Francais du Petrole, Rueil Malmaison Cedex, FR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 4/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A reverse-circulation drilling method and system includes a drill bit, a drill string having drill rods, and a rotary table or power swivel for bringing the drill bit into rotation by means of the rods. The system includes a positive-displacement pump made up of a stator and of a rotor, the stator being inserted in the drill rods, and the rotor being assembled to operating rods arranged within the drill rods.