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:
Sep. 06, 2011
Filed:
May. 30, 2007
Rory Mccrae Tulloch, Aberdeen, GB;
Victor Laing Allan, Aberdeenshire, GB;
Rory McCrae Tulloch, Aberdeen, GB;
Victor Laing Allan, Aberdeenshire, GB;
Sondex Limited, Yateley, Hampshire, GB;
Abstract
A rotary steerable tool () for use in a downhole drilling apparatus for adjusting the direction of drilling is disclosed. The tool comprises a tubular outer housing () and a row of steering pushers () slidably mounted to the housing for movement between an extended position, in which the steering pusher engages a wall of a borehole formed by the drilling apparatus, and a withdrawn position, in which the steering pushers do not engage the wall of the borehole. A tubular sleeve () is mounted inside the housing () to transmit rotary drive to a drilling bit. A pressure chamber () defined between the sleeve () and the housing () communicates with the steering pushers () to move the steering pushers () to the extended position. A piston () is slidably mounted in the sleeve () and is moved by means of changes in drilling fluid pressure between a first axial position, in which the interior of the sleeve () communicates directly with the pressure chamber () for directional drilling, and a second axial position, in which the interior of the sleeve () does not communicate directly with the pressure chamber () for straight drilling.