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. 23, 1987
Filed:
Aug. 27, 1985
Frank J Schuh, Plano, TX (US);
David D Hearn, Richardson, TX (US);
Atlantic Richfield Company, Los Angeles, CA (US);
Abstract
A means for substantially reducing the bending stresses, both tensional and compressional, in a standard-type length of drill pipe as it passes through a section of a wellbore that is deviated from vertical. The tool joints on the ends of drill pipe have outside diameters greater than that of the pipe body which act as supports for the pipe body against the wall of the wellbore in a deviated section. The bending stresses encountered by the drill pipe increase as the distance between these pipe supports increase. In the present invention, stress sleeves are affixed to the outer surface of the pipe body at equally spaced intervals between the tool joints to act as dummy tool joints thereby providing additional pipe supports which substantially reduce the bending stresses in the drill pipe.