| Patents for E21B 21 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (13,780) |
|---|
| 03/25/1980 | US4194567 Method and apparatus for balancing pressures in an oil well |
| 03/25/1980 | CA1074278A1 Recovery of drilling fluids |
| 03/25/1980 | CA1074090A1 Oxygen scavenging methods and additives |
| 03/18/1980 | USRE30230 Closed circuit method of circulating a substantially solid free drilling fluid |
| 03/18/1980 | US4193702 Jet mixer and method |
| 03/18/1980 | CA1073896A1 Drill steel centralizer |
| 03/11/1980 | US4192392 Recovery of drilling fluids |
| 03/04/1980 | US4191266 Process and installation for drilling holes in the earth's crust under freezing conditions |
| 03/04/1980 | CA1072944A1 Mud retaining valve |
| 02/26/1980 | US4190116 Mine roof bolter |
| 02/26/1980 | CA1072315A1 Aqueous clay base mud for deep drilling |
| 02/19/1980 | US4189243 In-line mud shearing apparatus |
| 02/19/1980 | CA1071946A1 Rock drill |
| 02/12/1980 | US4188624 Method and apparatus for monitoring fluid flow through a drill string |
| 02/12/1980 | US4187920 Enlarged bore hole drilling method and apparatus |
| 02/12/1980 | US4187911 Slant hole foam cleanout |
| 02/06/1980 | EP0007825A2 Underwater drilling method and apparatus relating thereto |
| 02/05/1980 | US4187087 Handling fluid discharged from a conduit at a high velocity |
| 02/05/1980 | US4186808 Earth boring machine with crushing rollers |
| 02/05/1980 | CA1071098A1 Cleanout procedure for well with low bottom hole pressure |
| 01/29/1980 | US4185703 Apparatus for producing deep boreholes |
| 01/29/1980 | CA1070682A1 Polygalactomannan allyl ether compositions |
| 01/29/1980 | CA1070667A1 Industrial vacuum cleaner |
| 01/22/1980 | US4184771 Centrifugal mud mixer |
| 01/22/1980 | US4184554 Check valve for rock drill |
| 01/08/1980 | US4182424 Drill steel centralizer |
| 01/01/1980 | CA1069114A Underreamer having cutter arm position indication |
| 01/01/1980 | CA1069113A Rock drilling process and device for start-up of sawe |
| 12/18/1979 | CA1068214A1 In-situ mining of copper and nickel |
| 12/04/1979 | US4176985 System and method for installing production casings |
| 11/27/1979 | US4175757 Sealant system for roof drilling apparatus |
| 11/27/1979 | US4175619 Well collar or shoe and cementing/drilling process |
| 11/14/1979 | EP0005273A1 Apparatus and method for removing hydrocarbons from drill cuttings |
| 11/13/1979 | US4174010 Rock drill |
| 11/13/1979 | US4173999 Technique for controlling lost circulation employing improved soft plug |
| 11/01/1979 | WO1979000859A1 Process and tool for ground drilling |
| 10/16/1979 | US4171187 Air injection sub |
| 10/16/1979 | US4171019 Apparatus and method for re-entering and cementing an underwater well |
| 10/16/1979 | CA1064469A1 Bit packer for dual tube drilling |
| 10/02/1979 | US4169510 Drilling and belling apparatus |
| 10/02/1979 | US4169483 Hydraulic jet drill stem and bit unplugging device |
| 09/25/1979 | US4168755 Nutating drill bit |
| 09/25/1979 | CA1063093A1 Drill crown coupling |
| 09/11/1979 | CA1062245A1 Drill cuttings separation and control apparatus |
| 09/05/1979 | EP0003815A1 Drill bit for a rotary percussion drilling machine |
| 09/04/1979 | CA1061709A1 Subterranean mining apparatus and method |
| 08/28/1979 | CA1061249A1 Subterranean drilling and slurry mining |
| 08/14/1979 | CA1060311A1 Rock drill |
| 07/24/1979 | US4162473 Drilling mud level measurement |
| 07/17/1979 | US4161222 Method for reducing contaminant emissions in gas drilling operations |
| 07/17/1979 | CA1058477A1 Valve assembly for the remote control of fluid flow having an automatic time delay |
| 07/17/1979 | CA1058382A1 Process of producing iron oxide weighting materials for drilling fluids |
| 07/11/1979 | EP0003005A1 Dust-collecting suction system for a rock-drilling apparatus |
| 07/03/1979 | CA1057651A1 Differential valve |
| 06/26/1979 | CA1057081A1 Method and apparatus for determining on-board a heaving vessel the flow rate of drilling fluid flowing out of a wellhole and into a telescoping marine riser connected between the wellhole and vessel |
| 06/12/1979 | CA1056366A1 Rock drilling apparatus and method |
| 06/12/1979 | CA1056363A1 Method and apparatus for controlling a well during drilling operations |
| 06/05/1979 | CA1055685A1 Method of well drilling and composition therefor |
| 05/29/1979 | US4156470 Rotary earth boring drill bit with centrifugal foreign particle barrier device |
| 05/29/1979 | CA1055475A1 Eductor apparatus having a variable orifice annular venturi nozzle for vacuum circulation in drilling system |
| 05/22/1979 | US4155724 Apparatus for the degasification of fluids |
| 05/22/1979 | US4155410 In drilling oil or gas wells |
| 05/22/1979 | US4155405 Polyacrylamide gel crosslinked with a dialdehyde |
| 05/22/1979 | CA1055010A1 Wireline sealing apparatus and method for use with a drill string |
| 05/15/1979 | US4154313 Flow control valve for rock bits |
| 05/08/1979 | CA1054140A1 Vacuum, vacuum-pressure, or pressure circulation bit having jet-assisted vacuum |
| 05/08/1979 | CA1054139A1 Electrical kelly cock assembly |
| 05/08/1979 | CA1054138A1 Eductor apparatus having an annular venturi nozzle for vacuum circulation in drilling system |
| 05/08/1979 | CA1054072A1 Foam killing device |
| 05/01/1979 | US4152125 Drilling fluid processing system |
| 04/17/1979 | US4149603 Riserless mud return system |
| 04/03/1979 | US4147212 Control of hydrogen sulfide gas to reduce toxicity and corrosion due to exposures thereto |
| 04/03/1979 | CA1051866A1 Dust collection system |
| 04/03/1979 | CA1051678A1 Regeneration of boring sludges_ |
| 03/27/1979 | CA1051416A1 Core and cuttings automatic recovery system |
| 03/27/1979 | CA1051297A1 Apparatus for pneumatically monitoring conditions of a well circulating system |
| 03/20/1979 | US4145165 Long stroke pump |
| 03/13/1979 | US4144043 Underground mine roof drill dust collection system |
| 03/13/1979 | CA1050255A1 Process and composition for drilling shale formation in sea water |
| 03/06/1979 | US4142595 Shale stabilizing drilling fluid |
| 03/06/1979 | CA1050004A1 Control method and apparatus for pressure, vacuum or pressure-vacuum circulation in drilling system |
| 02/27/1979 | US4141414 Device for supporting, raising and lowering duct in deep bore hole |
| 02/27/1979 | CA1049246A1 Drilling fluids containing phosphate ester acids |
| 02/13/1979 | US4139462 Method for thermally treating oil well drill cuttings |
| 02/13/1979 | US4138887 Drilling mud level monitor and alarm |
| 02/13/1979 | CA1048486A1 Vacuum, vacuum-pressure, or pressure reverse circulation bit |
| 02/06/1979 | US4137975 Drilling method |
| 01/30/1979 | US4136747 Displacement by nitrogen exhaust gases |
| 01/30/1979 | CA1047481A1 Apparatus and method for emplacing a conduit along an underground arcuate path |
| 01/30/1979 | CA1047243A1 Porous fe304 drilling mud additive |
| 01/23/1979 | US4135841 Mud flow heave compensator |
| 01/16/1979 | US4134619 Subterranean mining |
| 01/16/1979 | US4134463 Air lift system for large diameter borehole drilling |
| 01/16/1979 | US4134462 Geothermal energy recovery |
| 01/16/1979 | US4134461 Marine structure and method of drilling a hole by means of said structure |
| 01/16/1979 | US4134294 Device for simultaneously measuring various parameters of the drilling fluid |
| 01/02/1979 | CA1045562A1 Total gas containment system |
| 12/19/1978 | CA1044694A1 Dust control hood and dust control system |
| 12/05/1978 | US4128108 Mud retaining valve |
| 11/21/1978 | US4126193 Mobile drilling apparatus |