| 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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| 03/26/1985 | US4507208 Process for handling waste from oil well operations |
| 03/19/1985 | US4505341 Combination clean-out and drilling tool |
| 03/13/1985 | EP0134084A1 Well drilling and production fluids employing parenchymal cell cellulose |
| 03/12/1985 | CA1183832A1 Method of drilling a borehole through cavernous underground formations |
| 03/05/1985 | US4503170 Shear thickening fluid |
| 03/05/1985 | US4502969 Improved suspension of weighting agents |
| 03/05/1985 | US4502534 For installation below the rotary table of a drilling rig |
| 03/05/1985 | CA1183517A1 Combination clean-out and drilling tool |
| 03/05/1985 | CA1183340A1 High temperature stable fluid loss control system |
| 02/26/1985 | US4501337 Apparatus for forming and using a bore hole |
| 02/19/1985 | US4499957 Method for removing earth cuttings from holes being formed by a pneumatically exhausted drill tool |
| 02/19/1985 | US4499954 Geotechnical cone lubrication apparatus and method |
| 02/12/1985 | US4498995 A sealing slurry of expanded particles of clay, slate or clay shale |
| 02/12/1985 | US4498819 Multipoint slurry injection junction |
| 02/12/1985 | CA1182292A1 Method and apparatus for disposing of drill cuttings at an offshore location |
| 02/05/1985 | CA1182104A1 Method and apparatus for forming and using a bore hole |
| 01/31/1985 | WO1985000402A1 Well drilling and production fluids employing parenchymal cell cellulose |
| 01/31/1985 | WO1985000354A1 Process and apparatus for handling waste from oil well operations |
| 01/29/1985 | US4496468 Well completion fluids |
| 01/29/1985 | US4496012 Method for improving cuttings transport in deviated wells |
| 01/29/1985 | US4495999 Deep water hydrostatic head control |
| 01/29/1985 | US4495803 Method of monitoring the growth of cuttings beds in angled well bores |
| 01/23/1985 | EP0131618A1 Vent line system. |
| 01/22/1985 | US4495073 Selective filtering of different sized particles in a fluid |
| 01/22/1985 | US4494749 Seal assemblies |
| 01/16/1985 | EP0131451A2 Improvements in drilling equipment |
| 01/15/1985 | US4493382 Vehicle-mounted earth drilling apparatus |
| 01/15/1985 | CA1181016A1 Dust conveying and collecting system |
| 01/15/1985 | CA1181015A1 Flowline degaser |
| 01/08/1985 | US4492865 Borehole influx detector and method |
| 01/02/1985 | CA1180266A Foam and particulate material with steam for permeability alteration in subsurface formations |
| 12/25/1984 | US4489793 Control method and apparatus for fluid delivery in a rotary drill string |
| 12/20/1984 | WO1984004942A1 A method for removal of water from drill holes during deep drilling and a device for performing the method |
| 12/19/1984 | EP0128206A1 Flow diverter. |
| 12/18/1984 | US4488607 Separator sub with annular flow passage |
| 12/18/1984 | CA1179670A1 Blind shaft drilling |
| 12/18/1984 | CA1179669A1 Downhole vortex generator |
| 12/18/1984 | CA1179668A1 Rotating shaft seal and bearing lubricating apparatus |
| 12/11/1984 | US4487525 Propulsion pipe laying system |
| 12/05/1984 | EP0126740A1 A method employed in long-hole drilling and a drill rod system. |
| 12/04/1984 | US4485675 Pneumatic fluid densiometer |
| 11/28/1984 | EP0126268A1 Apparatus for generating pulsatorily active mechanical and hydraulic energy for the disintegration of rocks |
| 11/27/1984 | US4484643 For use with a drilling device |
| 11/27/1984 | CA1178532A1 Method of preventing muddy water loss in boring hole in ground |
| 11/22/1984 | WO1984004562A1 Drilling equipment |
| 11/20/1984 | US4483399 Method of deep drilling |
| 11/20/1984 | US4483189 Flushing apparatus for a drilling mud testing system |
| 11/20/1984 | CA1178048A1 Method for drying oil well drill cuttings |
| 11/13/1984 | US4482459 Continuous process for the reclamation of waste drilling fluids |
| 11/07/1984 | EP0124290A2 Drilling apparatus |
| 11/06/1984 | US4480813 Kelly cock rotary drive mechanism |
| 11/06/1984 | US4480702 Method and apparatus for drilling oil well and treating drilling mud |
| 10/30/1984 | US4479558 Drilling sub |
| 10/23/1984 | US4478287 For use with a floating drilling vessel |
| 10/23/1984 | US4478279 Retrievable inside blowout preventer valve apparatus |
| 10/23/1984 | US4478244 Mud saver valve |
| 10/23/1984 | CA1176665A1 Cooling system for cooling the bits of a cutting machine |
| 10/16/1984 | US4476894 Valve with circulation timer |
| 10/16/1984 | US4476715 Mud metering tank monitoring system |
| 10/16/1984 | CA1176155A1 Valve means |
| 10/11/1984 | WO1984003924A1 Drilling choke valve |
| 10/09/1984 | US4475603 For use in the drilling of a well |
| 10/02/1984 | US4474254 Portable drilling mud system |
| 10/02/1984 | US4474252 Method and apparatus for drilling generally horizontal bores |
| 10/02/1984 | US4474241 Differential fill valve assembly |
| 10/02/1984 | US4474240 Drilling fluid displacement process |
| 10/02/1984 | CA1175349A1 Method and apparatus for controlling the flow of drilling fluid in a wellbore |
| 09/26/1984 | EP0119268A1 Hydrojet drilling means and method |
| 09/25/1984 | US4473124 Method for operating rotary drilling under conditions of high cuttings transport efficiency |
| 09/25/1984 | US4473115 With stabilized solution of chlorine dioxide |
| 09/19/1984 | EP0118994A1 Cementing tool for wells |
| 09/18/1984 | US4471844 Device for containing and removing drilling slurry |
| 09/11/1984 | US4470469 Swivel head for drilling and mining tool |
| 09/11/1984 | US4470464 For installation in a well bore |
| 09/11/1984 | US4470462 Foam and particulate material with steam for permeability alteration in subsurface formations |
| 09/11/1984 | US4470430 Drilling choke |
| 09/04/1984 | US4469174 Combination cementing shoe and basket |
| 08/22/1984 | EP0116443A1 Down hole blow out preventer and method of use |
| 08/02/1984 | WO1984002949A1 Vent line system |
| 08/01/1984 | EP0022865B1 Hydraulically-driven downhole drill |
| 07/31/1984 | US4462470 Extrusion of bentonite clay for fluid loss reduction in drilling fluids |
| 07/31/1984 | US4462416 Method and apparatus for washing drilling cuttings |
| 07/24/1984 | US4461316 For use in severe operating conditions during earth drilling operations |
| 07/24/1984 | CA1171403A1 Method and apparatus for wetting powder |
| 07/24/1984 | CA1171402A1 Underreamer with debris flushing flow paths |
| 07/18/1984 | EP0113654A2 Rotating and/or percussive drilling machine |
| 07/17/1984 | US4460292 Process for containment of liquids as solids or semisolids |
| 07/17/1984 | US4460052 Prevention of lost circulation of drilling muds |
| 07/17/1984 | US4460045 Foam gravel packing in highly deviated wells |
| 07/17/1984 | CA1170981A1 Drill string safety valve |
| 07/10/1984 | US4459207 Method and apparatus for cleaning drilling fluids |
| 07/10/1984 | US4458528 For the comparative measurement of tendency of drilling fluid |
| 07/10/1984 | CA1170445A1 Aqueous drilling and packer fluids |
| 07/03/1984 | US4457988 Electrode of solid vein material in earth; mining |
| 07/03/1984 | US4457627 Circular containment system for well drilling fluid |
| 07/03/1984 | US4457384 Water separator and backflow valve |
| 07/03/1984 | US4457377 For use in cementing operations in wells |
| 06/26/1984 | US4456537 Chemically cleaning drilling/completion/packer brines |
| 06/26/1984 | US4456306 Cooling system for cooling the bits of a cutting machine |
| 06/26/1984 | US4456217 Kelly valving apparatus |