| Patents for E21B 21 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (13,780) |
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| 12/14/1982 | US4363366 Screened hollow stem auger for use in well drilling and testing process |
| 12/01/1982 | EP0065601A1 Constant bottom contact tool |
| 12/01/1982 | EP0065532A1 Method of treating oil-contaminated drill muds or cuttings prior to reuse or disposal |
| 11/30/1982 | US4361193 Method and arrangement for improving cuttings removal and reducing differential pressure sticking of drill strings in wellbores |
| 11/16/1982 | US4359115 Novel rotary drill bits and drilling process |
| 11/09/1982 | US4358298 For gases in a drilling fluid |
| 11/03/1982 | EP0063910A2 Multi phase separation process |
| 11/02/1982 | CA1134783A1 Process and system for recovering solid particulate addtives from a drilling fluid |
| 10/28/1982 | WO1982003566A1 Method and apparatus for removing organic contaminants from inorganic-rich minerals solids |
| 10/26/1982 | US4355826 Containment skirt for drilling fluid |
| 10/26/1982 | US4355784 Method and apparatus for controlling back pressure |
| 10/19/1982 | US4354560 Apparatus for drilling enlarged boreholes |
| 10/19/1982 | US4354559 Enlarged borehole drilling method and apparatus |
| 10/19/1982 | US4354513 Cuttings washer assembly |
| 10/12/1982 | US4353803 Land restoration following oil-well drilling and products useful therefor |
| 10/12/1982 | US4353719 Drilling fluid gas and solids removal system |
| 10/05/1982 | US4352739 Completion and workover fluid filtration system |
| 09/28/1982 | US4351400 Method of preventing drill string overflow |
| 09/22/1982 | EP0060827A1 Cooling means for the cutter of a coal cutting machine |
| 09/21/1982 | US4350505 Device for reduction of oxygen content in drilling fluid |
| 09/14/1982 | CA1131665A1 Hydraulic mining tool apparatus |
| 09/07/1982 | US4348279 Apparatus for cleaning drilling mud |
| 09/07/1982 | US4348058 Method and apparatus for slurry borehole mining |
| 09/07/1982 | US4347736 Continuous borehole-logging method |
| 09/07/1982 | CA1131209A1 Wellbore drilling technique using eccentric tool joints to mitigate pressure-differential sticking |
| 08/31/1982 | US4347002 Method and apparatus for the preparation of drilling mud |
| 08/31/1982 | US4346594 Method for locating the depth of a drill string washout or lost circulation zone |
| 08/24/1982 | US4345841 Multi-stage centrifugal mixer |
| 08/24/1982 | CA1130200A1 Down hole pump with bottom receptor |
| 08/17/1982 | US4344774 Degasser |
| 08/17/1982 | US4344491 Apparatus for actuating downhole flow control valves |
| 08/10/1982 | US4343370 Turbo-coring device equipped with a following pipe |
| 08/10/1982 | CA1129446A1 Method and apparatus for drilling and mining |
| 08/03/1982 | US4342222 Method for the determination of depth of a fluid-saturated stratum and fluid type |
| 07/27/1982 | US4341645 Comprising lignosulfonates and salt of copolymer of acrylic acid and hydroxypropyl acrylate |
| 07/27/1982 | US4341627 Screen separator |
| 07/27/1982 | US4341273 Rotary bit with jet nozzles |
| 07/27/1982 | US4341272 Method for freeing stuck drill pipe |
| 07/27/1982 | US4341115 Method and apparatus for monitoring structural and mechanical properties of drilling mud |
| 07/14/1982 | EP0056014A2 Dust conveying and collection system |
| 07/13/1982 | US4339108 Actuator for remotely operating a moving mechanism |
| 07/13/1982 | US4339007 Progressing cavity motor governing system |
| 07/13/1982 | US4338999 Knockout pin trap |
| 07/13/1982 | CA1127626A1 Drilling fluid circulation system |
| 07/06/1982 | CA1127286A1 Drilling mud level measurement |
| 06/29/1982 | US4336850 Internal fluid screen to prevent nozzle and port plugging |
| 06/29/1982 | US4336843 Emergency well-control vessel |
| 06/24/1982 | WO1982002072A1 Method and device for separation of the solid phase in the drilling mud |
| 06/22/1982 | US4335793 Process and apparatus for boring sites |
| 06/15/1982 | US4334987 Method of separation of solid phase in drilling mud |
| 06/09/1982 | EP0053117A1 Blender apparatus |
| 06/01/1982 | US4332301 Method and a machine of obtaining samples from the ground to determine its composition |
| 05/27/1982 | WO1982001737A1 Method of treating oil-contaminated drill muds or cuttings prior to reuse or disposal |
| 05/25/1982 | US4331458 For degassing liquid containing mediums such as drilling muds |
| 05/25/1982 | US4331207 Device for reversing the direction of flow of a fluid at the level of a drill bit |
| 05/25/1982 | CA1124102A1 Device for simultaneous measurement of drilling fluid parameters |
| 05/25/1982 | CA1124091A1 Oilfield disposal process |
| 05/18/1982 | US4330155 Bore hole mining |
| 04/27/1982 | US4326863 For use in drilling mud |
| 04/27/1982 | US4326859 Degassing of drilling fluids |
| 04/27/1982 | US4326736 Swivel joint for reverse circulation drill |
| 04/21/1982 | EP0050104A2 A device in core barrels |
| 04/13/1982 | US4324298 Scavenging hydrogen sulfide |
| 04/07/1982 | EP0048908A1 Drill, particularly for rotary percussion drilling |
| 04/06/1982 | US4323445 Apparatus for electrokinetically separating drilling mud |
| 04/06/1982 | US4323221 Power actuated valve |
| 04/06/1982 | US4322969 Gas pressure relieving hydrostatic tester |
| 03/30/1982 | US4321975 Slurry diverter |
| 03/30/1982 | US4321974 Annular drilling hammer |
| 03/30/1982 | CA1121017A1 Oilfield pump stroke monitor |
| 03/23/1982 | US4321135 Method for separating solid phase from drilling mud |
| 03/17/1982 | EP0047347A1 Apparatus for separating gas and solids from a liquid and drilling system comprising such an apparatus |
| 03/16/1982 | US4319991 Material separating machine |
| 03/16/1982 | US4319784 Apparatus for water jet and impact drilling and mining |
| 03/16/1982 | US4319647 Flame drill channelling method and apparatus for reducing noise and dust levels |
| 03/16/1982 | CA1120028A1 Fluid circulation reversing devise at a well boring tool |
| 02/23/1982 | US4316596 Power actuated valve |
| 02/23/1982 | US4316514 Method of binding dust created when drilling rock with a drilling rod |
| 02/16/1982 | US4315553 Continuous circulation apparatus for air drilling well bore operations |
| 02/16/1982 | CA1118387A1 Flow regulator and particle separation apparatus |
| 02/09/1982 | US4314611 Apparatus for supporting and rotating a down hole tubular |
| 02/04/1982 | WO1982000315A1 Valve device |
| 02/02/1982 | US4313785 Method and apparatus for treating waste rock cuttings |
| 01/27/1982 | EP0044706A2 Method and apparatus for forming and using a bore hole |
| 01/27/1982 | EP0044466A1 Centrifugal degasser |
| 01/26/1982 | US4312415 Reverse circulating tool |
| 01/21/1982 | WO1982000166A1 Method for substituting a cement grout,a mortar or a concrete for bentonite mud contained in a cavity |
| 01/13/1982 | EP0043609A1 Rotary bit with jet nozzles |
| 01/12/1982 | US4310058 Well drilling method |
| 01/12/1982 | US4310050 Well drilling apparatus |
| 01/12/1982 | CA1116263A1 Method and apparatus for monitoring fluid flow through a drill string |
| 01/12/1982 | CA1116102A1 Method of collecting dust during rock drilling and a dust collecting suction system for a rock drilling apparatus |
| 01/06/1982 | EP0043332A1 Method of substituting a cement slurry, a mortar or a concrete to a bentonite slurry contained in a cavity |
| 01/05/1982 | US4308918 Blowout preventer |
| 12/30/1981 | EP0042390A1 Kelly valving apparatus |
| 12/29/1981 | CA1115008A1 Slug and wipe tool |
| 12/15/1981 | US4305468 Method for drilling wellbores from an offshore platform |
| 12/15/1981 | US4305462 Apparatus for positioning deflection wedges |
| 12/15/1981 | CA1114311A1 Degasification system |
| 12/15/1981 | CA1114145A1 Method and means for using inert gas for reduction of oxygen content in drilling fluids |