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Class Information
Number: 175/81
Name: Boring or penetrating the earth > Tool shaft advanced relative to guide insertable in inaccessible hole to change direction of advance > With anchor for guide engaging hole side wall
Description: Apparatus in which the means changing the direction of advance has combined therewith means to engage or penetrate a side wall of the hole to resist movement of the direction changing means either longitudinally or radially of the hole.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8561722 Methods of controllably milling a window in a cased wellbore using a pressure differential to cause movement of a mill Oct. 22, 2013
8505651 Anchor system and method for anchoring a tool with a positional bias Aug. 13, 2013
8485281 Equipment for drilling secant holes Jul. 16, 2013
8453737 Diameter based tracking for window milling system Jun. 4, 2013
8327952 Self-contained system for drilling a drainhole Dec. 11, 2012
8256535 Mill-through tailpipe liner exit and method of use thereof Sep. 4, 2012
8230914 Anchor tool Jul. 31, 2012
8230948 Self-contained system for drilling a drainhole Jul. 31, 2012
8220554 Degradable whipstock apparatus and method of use Jul. 17, 2012
8118099 Method and apparatus for forming and sealing a hole in a sidewall of a borehole Feb. 21, 2012
8069915 Non-metallic whipstock Dec. 6, 2011
8020634 Method and apparatus for supporting a downhole component in a downhole drilling tool Sep. 20, 2011
8011453 Drilling system and methods of drilling lateral boreholes Sep. 6, 2011
7926592 Steerable drilling system Apr. 19, 2011
7690443 Apparatus, system, and method for casing hole formation in radial drilling operations Apr. 6, 2010
7690444 Horizontal waterjet drilling method Apr. 6, 2010
RE41059 Expandable wellbore junction Dec. 29, 2009
7575050 Method and apparatus for a downhole excavation in a wellbore Aug. 18, 2009
7484573 Slip grip drilling tool Feb. 3, 2009
7448446 Thru tubing tool and method Nov. 11, 2008
7178589 Thru tubing tool and method Feb. 20, 2007
6889781 Horizontal directional drilling in wells May. 10, 2005
6880631 Whipstock casing milling system Apr. 19, 2005
6848504 Apparatus and method to complete a multilateral junction Feb. 1, 2005
6843314 Retrievable through-tubing whipstock apparatus having fluid-responsive pivotal anchoring members Jan. 18, 2005
6786283 Methods and associated apparatus for drilling and completing a wellbore junction Sep. 7, 2004
6761217 Downhole latch assembly and method of using the same Jul. 13, 2004
6719045 Whipstock assembly Apr. 13, 2004
6712144 Method for drilling multilateral wells with reduced under-reaming and related device Mar. 30, 2004
6668945 Method and apparatus for milling a window in a well casing or liner Dec. 30, 2003
6591905 Orienting whipstock seat, and method for seating a whipstock Jul. 15, 2003
6588542 Borehole tool actuating mechanism Jul. 8, 2003
6588517 Boring apparatus Jul. 8, 2003
6554062 Anchor apparatus and method Apr. 29, 2003
6550553 Boring apparatus Apr. 22, 2003
6464002 Whipstock assembly Oct. 15, 2002
6457525 Method and apparatus for completing multiple production zones from a single wellbore Oct. 1, 2002
6419010 Deviated borehole drilling assembly Jul. 16, 2002
6419012 Deviated borehole drilling assembly Jul. 16, 2002
6378629 Boring apparatus Apr. 30, 2002
6371221 Coring bit motor and method for obtaining a material core sample Apr. 16, 2002
6334485 Deviated borehole drilling assembly Jan. 1, 2002
6315075 Borehole logging tool with anchoring mechanism Nov. 13, 2001
6283208 Orienting tool and method Sep. 4, 2001
6260623 Apparatus and method for utilizing flexible tubing with lateral bore holes Jul. 17, 2001
6220372 Apparatus for drilling lateral drainholes from a wellbore Apr. 24, 2001
6202761 Directional drilling method and apparatus Mar. 20, 2001
6189616 Expandable wellbore junction Feb. 20, 2001
6186233 Down hole assembly and method for forming a down hole window and at least one keyway in communication with the down hole window for use in multilateral wells Feb. 13, 2001
6073691 Torque resistant retrievable whipstock Jun. 13, 2000

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