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Class Information
Number: 175/80
Name: Boring or penetrating the earth > Tool shaft advanced relative to guide insertable in inaccessible hole to change direction of advance > Tool telescopes over guide having surface set at angle in hole
Description: Apparatus in which the means changing the direction of advance comprises a rod or mandrel having a shaft engaging surface which is set in the hole at an angle to the original direction of advance, the shaft receiving the rod or mandrel in a telescoping relationship to be guided in a different direction thereby.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8607858 Spiral whipstock for low-side casing exits Dec. 17, 2013
8453737 Diameter based tracking for window milling system Jun. 4, 2013
8307890 Whipstock assembly Nov. 13, 2012
8220554 Degradable whipstock apparatus and method of use Jul. 17, 2012
8011453 Drilling system and methods of drilling lateral boreholes Sep. 6, 2011
7896108 Dual string orbital drilling system Mar. 1, 2011
7610971 One trip milling system and method Nov. 3, 2009
6991048 Wellbore plug system and method Jan. 31, 2006
6968903 Orientable whipstock tool and method Nov. 29, 2005
6964303 Horizontal directional drilling in wells Nov. 15, 2005
6915853 Method and device for perforating a portion of casing in a reservoir Jul. 12, 2005
6899173 Small tubular window system May. 31, 2005
6889781 Horizontal directional drilling in wells May. 10, 2005
6848508 Slant entry well system and method Feb. 1, 2005
6786283 Methods and associated apparatus for drilling and completing a wellbore junction Sep. 7, 2004
6755248 One trip through tubing window milling apparatus and method Jun. 29, 2004
6715567 Apparatus and method for forming a pilot hole in a formation Apr. 6, 2004
6712144 Method for drilling multilateral wells with reduced under-reaming and related device Mar. 30, 2004
6470978 Fluid drilling system with drill string and retro jets Oct. 29, 2002
6419010 Deviated borehole drilling assembly Jul. 16, 2002
6419012 Deviated borehole drilling assembly Jul. 16, 2002
6386287 Deviated borehole drilling assembly May. 14, 2002
6334485 Deviated borehole drilling assembly Jan. 1, 2002
6302198 One trip milling system Oct. 16, 2001
6283208 Orienting tool and method Sep. 4, 2001
6279659 Assembly and method for providing a means of support and positioning for drilling multi-lateral wells and for reentry therein through a premilled window Aug. 28, 2001
6247541 Method of drive pipe replacements on offshore platforms Jun. 19, 2001
6209645 Method and apparatus for accurate milling of windows in well casings Apr. 3, 2001
6209635 Positioning and conveying well apparatus and method Apr. 3, 2001
6202761 Directional drilling method and apparatus Mar. 20, 2001
6192748 Dynamic orienting reference system for directional drilling Feb. 27, 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
6102123 One trip milling system Aug. 15, 2000
6050334 Single trip whipstock assembly Apr. 18, 2000
6012516 Deviated borehole drilling assembly Jan. 11, 2000
5964287 Window assembly for multiple wellbore completions Oct. 12, 1999
5884698 Whipstock assembly Mar. 23, 1999
5826651 Wellbore single trip milling Oct. 27, 1998
5727629 Wellbore milling guide and method Mar. 17, 1998
5657820 Two trip window cutting system Aug. 19, 1997
5584350 Wellbore sidetracking methods Dec. 17, 1996
5544704 Drillable whipstock Aug. 13, 1996
5535822 Apparatus for retrieving whipstock Jul. 16, 1996
5437340 Millout whipstock apparatus and method Aug. 1, 1995
5435400 Lateral well drilling Jul. 25, 1995
5383522 Whipstock and method Jan. 24, 1995
5379845 Method for setting a whipstock in a wellbore Jan. 10, 1995
5335737 Retrievable whipstock Aug. 9, 1994
5297638 Drivepipe guide and installation method for wells Mar. 29, 1994
5052502 Apparatus for directional coring Oct. 1, 1991

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