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Class Information
Number: 175/71
Name: Boring or penetrating the earth > Processes > Boring with specific fluid > Gaseous fluid or under gas pressure
Description: Processes comprising (1) drilling with a gaseous fluid as the circulating drilling fluid or (2) the placing of a gas under pressure in the borehole during drilling either along or over a liquid drilling fluid.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8607897 Center discharge gas turbodrill Dec. 17, 2013
8297377 Method and system for accessing subterranean deposits from the surface and tools therefor Oct. 30, 2012
7694752 Dry drilling Apr. 13, 2010
7500528 Low temperature barrier wellbores formed using water flushing Mar. 10, 2009
7387176 Down hole air diverter Jun. 17, 2008
7281593 Method for the circulation of gas when drilling or working a well Oct. 16, 2007
7140455 Valve method for drilling with casing using pressurized drilling fluid Nov. 28, 2006
7073589 System for fracturing wells using supplemental longer-burning propellants Jul. 11, 2006
6973885 Mobile subterranean aerator and deep root stimulator Dec. 13, 2005
6843331 Method and apparatus for varying the density of drilling fluids in deep water oil drilling applications Jan. 18, 2005
6808693 Methods and apparatus for increasing and extending oil production from underground formations nearly depleted of natural gas drive Oct. 26, 2004
6801814 Apparatus and method for computerized data collection, monitoring, analysis, and control of grouting operations Oct. 5, 2004
6722436 Apparatus and method for operating an internal combustion engine to reduce free oxygen contained within engine exhaust gas Apr. 20, 2004
6662885 Method and apparatus for providing a stream of pressurized substantially inert gas Dec. 16, 2003
6648084 Head for injecting liquid under pressure to excavate the ground Nov. 18, 2003
6637522 Enhanced computer control of in-situ drilling system Oct. 28, 2003
6536540 Method and apparatus for varying the density of drilling fluids in deep water oil drilling applications Mar. 25, 2003
6520256 Method and apparatus for cementing an air drilled well Feb. 18, 2003
6467558 Multiple air hammer apparatus and excavating direction correcting method therefor Oct. 22, 2002
6443245 Non-cryogenic nitrogen for on-site downhole drilling and post drilling operations Sep. 3, 2002
6347675 Coiled tubing drilling with supercritical carbon dioxide Feb. 19, 2002
6267186 Spotting fluid and method of treating a stuck pipe Jul. 31, 2001
6231270 Apparatus and method of installing piles May. 15, 2001
6206113 Non-cryogenic nitrogen for on-site downhole drilling and post drilling operations apparatus Mar. 27, 2001
6041873 Non-cryogenic nitrogen for on-site downhole drilling and post drilling operations Mar. 28, 2000
6032747 Water-based drilling fluid deacidification process and apparatus Mar. 7, 2000
5944122 Methods and apparatus for controlling an air compressor in a drill string flushing system Aug. 31, 1999
5890549 Well drilling system with closed circulation of gas drilling fluid and fire suppression apparatus Apr. 6, 1999
5875858 Low volume air-water drilling systems and methods Mar. 2, 1999
5865261 Balanced or underbalanced drilling method and apparatus Feb. 2, 1999
5862869 Non-cryogenic nitrogen for on-site downhole drilling and post drilling operations Jan. 26, 1999
5775442 Recovery of gas from drilling fluid returns in underbalanced drilling Jul. 7, 1998
5749422 Non-cryogenic nitrogen for on-site downhole drilling and post drilling operations May. 12, 1998
5663121 Method and apparatus for providing a stream of inert gases in underbalanced drilling of a well bore Sep. 2, 1997
5584352 Pneumatic drilling chip removal system and method Dec. 17, 1996
5515932 Apparatus and method for environmental surveying for contaminants in alluvial materials and bedrock formations May. 14, 1996
5497841 Methods for coring a masonry wall Mar. 12, 1996
5490571 Sub-assembly for dust suppression in rock drilling Feb. 13, 1996
5409072 Method and an arrangement for controlling the supply of air into a rock drilling machine Apr. 25, 1995
5407019 Apparatus and method for environmental surveying for contaminants in alluvial materials and bedrock formations Apr. 18, 1995
5407020 Pneumatic drilling chip removal system and method Apr. 18, 1995
5388650 Non-cryogenic production of nitrogen for on-site injection in downhole drilling Feb. 14, 1995
5307883 Method and apparatus for controlling a ramming device May. 3, 1994
5273344 Process for inerting a coal mining site Dec. 28, 1993
5193627 Apparatus for controlling a ramming device Mar. 16, 1993
5135058 Crane-mounted drill and method for in-situ treatment of contaminated soil Aug. 4, 1992
5116104 Method and equipment for loosening and/or winning minerals especially coal and aggregated materials by using compressed air breaking May. 26, 1992
5048620 Method for air rotary drilling of test wells Sep. 17, 1991
4981182 Sealed rotary blast hole drill bit utilizing air pressure for seal protection Jan. 1, 1991
4958689 Method of providing a high pressure surge of working fluid to an underground percussive mole Sep. 25, 1990

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