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Class Information
Number: 175/69
Name: Boring or penetrating the earth > Processes > Boring with specific fluid > Combined liquid and gaseous fluid
Description: Processes comprising the use of liquid and gaseous materials as the fluid circulated in the borehole.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8517122 Air/water separator and methods of use thereof Aug. 27, 2013
8469119 Method and system for accessing subterranean deposits from the surface and tools therefor Jun. 25, 2013
8459376 System for drilling under balanced wells Jun. 11, 2013
8371399 Method and system for accessing subterranean deposits from the surface and tools therefor Feb. 12, 2013
8272456 Slim-hole parasite string Sep. 25, 2012
8176981 Fluorinated surfactants and methods of using the same May. 15, 2012
8141661 Enhanced oil-based foam drilling fluid compositions and method for making and using same Mar. 27, 2012
8127866 Air injection collar Mar. 6, 2012
8047305 Vacuum feed supply system for drilling fluid additives Nov. 1, 2011
7971659 Foamer/sulfur scavenger composition and methods for making and using same Jul. 5, 2011
7964537 Air drilling misting fluid contains syrups Jun. 21, 2011
7886849 System for drilling under-balanced wells Feb. 15, 2011
7874381 Pneumatic line deicing system Jan. 25, 2011
7842650 Mixture for improved foaming in the extraction of petroleum or natural gas Nov. 30, 2010
7767628 Method for foaming a hydrocarbon drilling fluid and for producing light weight hydrocarbon fluids Aug. 3, 2010
7718581 Method using composition to reduce cutting head wear May. 18, 2010
7665522 Fiber laden energized fluids and methods of use Feb. 23, 2010
7516803 Air injection collar Apr. 14, 2009
7178592 Closed loop multiphase underbalanced drilling process Feb. 20, 2007
7111695 Pneumatic rock-boring device and method for horizontal drilling using compressed air and drilling medium Sep. 26, 2006
7108066 Variable density treatment fluids and methods of using such fluids in subterranean formations Sep. 19, 2006
7077219 Foamed treatment fluids and associated methods Jul. 18, 2006
7055628 Well drilling method and drilling fluid Jun. 6, 2006
7040419 Foamed compositions and methods of use in subterranean zones May. 9, 2006
7025154 Method and system for circulating fluid in a well system Apr. 11, 2006
6817427 Device and method for extracting a gas hydrate Nov. 16, 2004
6802673 Tunnel boring with foamed composition Oct. 12, 2004
6745857 Method of drilling sub-sea oil and gas production wells Jun. 8, 2004
6722436 Apparatus and method for operating an internal combustion engine to reduce free oxygen contained within engine exhaust gas Apr. 20, 2004
6715553 Methods of generating gas in well fluids Apr. 6, 2004
6672408 System and apparatus for excavating contaminated pilings Jan. 6, 2004
6561288 Method and system for accessing subterranean deposits from the surface May. 13, 2003
6474422 Method for controlling a well in a subsea mudlift drilling system Nov. 5, 2002
6460632 Methods of drilling well bores Oct. 8, 2002
6394195 Methods for the dynamic shut-in of a subsea mudlift drilling system May. 28, 2002
6347675 Coiled tubing drilling with supercritical carbon dioxide Feb. 19, 2002
6286601 Process comprising a reversible forming composition Sep. 11, 2001
6267186 Spotting fluid and method of treating a stuck pipe Jul. 31, 2001
6148917 Method of releasing stuck pipe or tools and spotting fluids therefor Nov. 21, 2000
6145601 Method and device for boring holes Nov. 14, 2000
6050352 Drilling technique utilizing drilling fluids directed on low angle cutting faces Apr. 18, 2000
5875858 Low volume air-water drilling systems and methods Mar. 2, 1999
5873420 Air and mud control system for underbalanced drilling Feb. 23, 1999
5851960 Method of performing well drilling operations with a foamable drilling fluid Dec. 22, 1998
5846913 Invert biodegradable n-alkane(s) wellbore fluid containing less than 10 percent by weight of cycloparaffing isoparaffing and aromatic compounds, and method of drilling with such fluid Dec. 8, 1998
5513712 Polymer enhanced foam drilling fluid May. 7, 1996
5495891 Foamed gel employed as a drilling fluid, a lost circulation fluid, or a combined drilling/lost circulation fluid Mar. 5, 1996
5490571 Sub-assembly for dust suppression in rock drilling Feb. 13, 1996
5411105 Drilling a well gas supply in the drilling liquid May. 2, 1995
5385206 Iterated foam process and composition for well treatment Jan. 31, 1995

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