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:
Jul. 02, 1985
Filed:
May. 27, 1983
Edward O Anders, Houston, TX (US);
Dailey Petroleum Services Corp., Conroe, TX (US);
Abstract
An adjustable length drilling sub is disclosed for placing in a drill string between stabilizers to allow the distance between the stabilizers to be changed while the drill string is in the well bore to adjust the rate the angle of the well bore from the vertical is changing. The sub includes an outer member and an inner member that extends into the outer member with an annular space between the members. Protrusions in the form of drive pins mounted in the wall of the outer member extend into the annular space to move into and out of engagement with cavities formed on the outer surface of the inner member. When the pins are in engagement with the cavities, torque in one direction and weight can be transmitted to the bit. When the pins are rotated in the other direction out of the cavities, the members can be moved longitudinally relative to each other to change the distance between the stabilizers.