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Class Information
Number: 175/215
Name: Boring or penetrating the earth > With above-ground means for handling drilling fluid or cutting > With tool shaft having plural passages for drilling fluid
Description: Apparatus including a tool shaft which is provided with more than one fluid conduit through a substantial portion of its length.

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8679298 Remotely controlled decoking tool used in coke cutting operations Mar. 25, 2014
8555962 Downhole tool unit Oct. 15, 2013
8550187 Drilling apparatus and method for working the ground Oct. 8, 2013
8439132 Microtunnelling system and apparatus May. 14, 2013
8272456 Slim-hole parasite string Sep. 25, 2012
8151906 Microtunnelling system and apparatus Apr. 10, 2012
7845432 Microtunnelling system and apparatus Dec. 7, 2010
7810573 Method for retrofitting a downhole drill string with a flow through subassembly and method for making same Oct. 12, 2010
7694753 Dual rod drill pipe with improved flow path method and apparatus Apr. 13, 2010
7665549 Entrainment fluid channeling device for a down-hole drill string Feb. 23, 2010
7581601 Drill cuttings re-injection system Sep. 1, 2009
7389831 Dual-member auger boring system Jun. 24, 2008
7377283 Coiled tubing wellbore cleanout May. 27, 2008
7357198 Downhole apparatus Apr. 15, 2008
7322432 Fluid diverter tool and method Jan. 29, 2008
7143846 Method for drilling and drilling apparatus to enable reverse circulation Dec. 5, 2006
7066283 Reverse circulation directional and horizontal drilling using concentric coil tubing Jun. 27, 2006
7028586 Apparatus and method relating to tongs, continous circulation and to safety slips Apr. 18, 2006
6997272 Method and apparatus for increasing drilling capacity and removing cuttings when drilling with coiled tubing Feb. 14, 2006
6982008 Coiled tubing wellbore cleanout Jan. 3, 2006
6923871 Coiled tubing wellbore cleanout Aug. 2, 2005
6892829 Two string drilling system May. 17, 2005
6854534 Two string drilling system using coil tubing Feb. 15, 2005
6840337 Method and apparatus for removing cuttings Jan. 11, 2005
6769498 Method and apparatus for inducing under balanced drilling conditions using an injection tool attached to a concentric string of casing Aug. 3, 2004
6607607 Coiled tubing wellbore cleanout Aug. 19, 2003
6550554 Rock drill Apr. 22, 2003
6405812 Drilling tool for the air-lifting process Jun. 18, 2002
6371223 Drill head for directional boring Apr. 16, 2002
6367566 Down hole, hydrodynamic well control, blowout prevention Apr. 9, 2002
6352393 Apparatus for transporting loosened particulate material using fluid under pressure Mar. 5, 2002
6311791 Hydraulic underreamer and sections for use therein Nov. 6, 2001
6241030 Hydraulic underreamer and sections for use therein Jun. 5, 2001
6237702 Hydraulic underreamer and sections for use thereof May. 29, 2001
6223839 Hydraulic underreamer and sections for use therein May. 1, 2001
6176311 Downhole cutting separator Jan. 23, 2001
6138777 Hydraulic underreamer and sections for use therein Oct. 31, 2000
6119772 Continuous flow cylinder for maintaining drilling fluid circulation while connecting drill string joints Sep. 19, 2000
6109370 System for directional control of drilling Aug. 29, 2000
6105692 Swivel chamber for water actuated wireline drills Aug. 22, 2000
6095261 Drill bit reverse circulation apparatus and method Aug. 1, 2000
5860232 Mobile safe excavation system having a deflector plate and vacuum source Jan. 19, 1999
5823273 Well stabilization tools and methods Oct. 20, 1998
5823274 Drill rod Oct. 20, 1998
5778993 Locking a sample tube in a downhole hammer Jul. 14, 1998
5713423 Drill pipe Feb. 3, 1998
5711375 Well stabilization tools and methods Jan. 27, 1998
5701963 Continuous injection of an inert gas through a drill rig for drilling into potentially hazardous areas Dec. 30, 1997
5685380 Reverse circulation down-the-hole drill Nov. 11, 1997
5590725 Drilling column with sledgehammer drilling head Jan. 7, 1997

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