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. 20, 1991
Filed:
Oct. 11, 1990
Applicant:
Inventor:
Dwight S Nunley, Gretna, LA (US);
Assignee:
Other;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175 61 ; 175 65 ; 175323 ; 138118 ; 464 18 ;
Abstract
A method and apparatus is provided for drilling high-angle, directional and horizontal subterranean wells for hydrocarbon extraction. A drillstring component having at least one helical undercut pumping chamber is described, which drillstring component is designed especially for increased flexibility in directional drilling applications. The undercut pumping chamber of the invention drillstring component is designed to improve volumetric efficiency in removing cuttings from the borehole, and to reduce the incidence of differential sticking or key-seating.