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Class Information
Number: 175/325.3
Name: Boring or penetrating the earth > With tool shaft detail > Shaft carried guide or protector > Coupled between shaft sections or bit and shaft section > With bore wall engaging means rotatable relative to shaft section (e.g., with bearings)
Description: Apparatus where a borehole contacting device is mounted on the shaft section in a manner that allows the shaft section to rotate while the guide or protector means is substantially fixed in the borehole.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8622153 Downhole assembly Jan. 7, 2014
8579047 Downhole reservoir effluent column pressure restraining apparatus and methods Nov. 12, 2013
8561726 Vertical drilling system for controlling deviation Oct. 22, 2013
8511941 Device and method for drilling and compacting ground Aug. 20, 2013
8434567 Borehole drilling apparatus, systems, and methods May. 7, 2013
8376616 Bearing assembly for a downhole motor Feb. 19, 2013
8312940 Apparatus and method for improvements in wellbore drilling Nov. 20, 2012
8245775 Wellbore consolidating tool for rotary drilling application Aug. 21, 2012
8245779 Centralizer apparatus Aug. 21, 2012
8082988 Apparatus and method for stabilization of downhole tools Dec. 27, 2011
8061451 Vertical drilling system for controlling deviation Nov. 22, 2011
8051928 Downhole assembly and cutter assembly Nov. 8, 2011
8011429 Transport assembly Sep. 6, 2011
7866384 Downhole device Jan. 11, 2011
7810559 Wellbore consolidating tool for rotary drilling applications Oct. 12, 2010
7798253 Method and apparatus for controlling precession in a drilling assembly Sep. 21, 2010
7766102 Downhole assembly and cutter assembly Aug. 3, 2010
7578360 Dynamic damper for use in a drill string Aug. 25, 2009
7493948 Wellbore consolidating tool for rotary drilling applications Feb. 24, 2009
7484573 Slip grip drilling tool Feb. 3, 2009
7395881 Roller subs Jul. 8, 2008
7306060 Drilling assembly with a steering device for coiled-tubing operations Dec. 11, 2007
7299885 Downhole drill string having a collapsible subassembly and method of loosening a stuck drillstring Nov. 27, 2007
7267184 Modular housing for a rotary steerable tool Sep. 11, 2007
7216726 Downhole fluid-tight flexible joint May. 15, 2007
7192094 Auger flight support system Mar. 20, 2007
7188689 Variable gauge drilling apparatus and method of assembly therefor Mar. 13, 2007
7182160 Drill string element having at least one bearing zone, a drill string, and a tool joint Feb. 27, 2007
7090007 Centralizer for wireline tools Aug. 15, 2006
7028789 Drilling assembly with a steering device for coiled-tubing operations Apr. 18, 2006
7000713 Blockless reamer Feb. 21, 2006
6968904 Method and apparatus for operations in underground/subsea oil and gas wells Nov. 29, 2005
6935442 Stabilizer device for rotary string of drill rods with reduced friction Aug. 30, 2005
6688409 Friction reducing tool and method for its use in a wellbore Feb. 10, 2004
6679559 Auger flight support for plural auger coal mining systems Jan. 20, 2004
6668945 Method and apparatus for milling a window in a well casing or liner Dec. 30, 2003
6666267 Downhole tools Dec. 23, 2003
6655477 Friction-reducing drill pipe component Dec. 2, 2003
6626254 Drilling assembly with a steering device for coiled-tubing operations Sep. 30, 2003
6622803 Stabilizer for use in a drill string Sep. 23, 2003
6609579 Drilling assembly with a steering device for coiled-tubing operations Aug. 26, 2003
6588517 Boring apparatus Jul. 8, 2003
6585043 Friction reducing tool Jul. 1, 2003
6557654 Drill pipe having a journal formed thereon May. 6, 2003
6550553 Boring apparatus Apr. 22, 2003
6494274 Axle, a friction reducing fitting and an axle installation method Dec. 17, 2002
6427783 Steerable modular drilling assembly Aug. 6, 2002
6394198 Frictional vibration damper for downhole tools May. 28, 2002
6382333 Friction reducing tool for oilfield drilling applications May. 7, 2002
6378629 Boring apparatus Apr. 30, 2002

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