| 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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| 01/14/1986 | CA1199264A1 Process and system for detecting a native reservoir fluid in a well bore |
| 01/07/1986 | US4562853 Downhole fire control |
| 12/17/1985 | US4559149 Workover fluid |
| 12/11/1985 | EP0164225A2 Clarification of high density brine fluids |
| 12/10/1985 | US4557489 Pressure balanced seal |
| 12/10/1985 | US4557142 Apparatus and method for real-time measurement of drilling fluid properties |
| 11/27/1985 | EP0162074A1 Liquid recovery unit. |
| 11/26/1985 | US4555064 Pebble-stone crushing device for use in excavator for laying pipelines underground |
| 11/26/1985 | CA1197176A1 Combination cementing shoe and basket |
| 11/21/1985 | EP0161926A2 Polymeric compositions |
| 11/19/1985 | US4553429 Method and apparatus for monitoring fluid flow between a borehole and the surrounding formations in the course of drilling operations |
| 11/05/1985 | US4551256 Slurry excavating method |
| 10/30/1985 | EP0159900A2 Apparatus and method for inserting flow control means into a well casing |
| 10/30/1985 | EP0159827A2 Process and apparatus for drill stem breakout during drilling operation |
| 10/29/1985 | CA1195921A1 Blow out preventer warning system |
| 10/22/1985 | US4548525 Method and apparatus for pre-dilution of drilling mud slurry and the like |
| 10/22/1985 | US4548283 Rotating shaft seal and bearing lubricating apparatus |
| 10/15/1985 | US4546828 Diverter system and blowout preventer |
| 10/15/1985 | US4546783 Apparatus for washing drill cuttings |
| 10/08/1985 | US4545702 Boring-injection device, method for improving ground by means of the device and method for investigating ground state by means of the device |
| 10/08/1985 | US4545443 Means for drilling |
| 10/08/1985 | US4545441 Drill bits with polycrystalline diamond cutting elements mounted on serrated supports pressed in drill head |
| 10/02/1985 | EP0156612A2 Improved pressure balanced seal |
| 10/02/1985 | EP0156609A1 Hammer for use in a bore hole and apparatus for use therewith |
| 10/02/1985 | EP0156031A1 Method of oil recovery |
| 10/02/1985 | EP0156030A1 Aqueous drilling fluid |
| 10/01/1985 | CA1194408A1 Kelly cock rotary drive mechanism |
| 10/01/1985 | CA1194407A1 Flow diverter |
| 09/26/1985 | WO1985004212A1 Hammer for use in a bore hole and apparatus for use therewith |
| 09/25/1985 | EP0155768A2 Contamination removal system and method |
| 09/17/1985 | US4541494 Drill bit assembly |
| 09/10/1985 | US4540055 Drill bit assembly having improved operational life |
| 09/03/1985 | US4539102 Method and apparatus for separating artificial drill cuttings from natural drill cuttings |
| 09/03/1985 | CA1192897A1 Auxiliary controlled valve disposed in a drilling string |
| 08/20/1985 | US4535852 Drill string valve actuator |
| 08/20/1985 | US4535851 Fluid flow measurement system |
| 08/15/1985 | WO1985003559A1 Full opening check valve |
| 08/15/1985 | WO1985003545A1 Method for inner cleaning of a core bit with reversed fluid flushing and a core bit herefor |
| 08/14/1985 | EP0151548A1 Drill bit for combined rotary and high pressure jet drilling |
| 08/13/1985 | US4534676 Excavating and propelling machine for laying pipelines underground |
| 08/13/1985 | US4534427 Abrasive containing fluid jet drilling apparatus and process |
| 08/13/1985 | US4534426 Packer weighted and pressure differential method and apparatus for Big Hole drilling |
| 08/13/1985 | CA1191781A1 Flow diverter |
| 08/13/1985 | CA1191780A1 Flow diverter |
| 08/07/1985 | EP0150695A2 Well drilling assembly |
| 08/06/1985 | US4532995 Well casing float shoe or collar |
| 08/06/1985 | US4532812 Parametric acoustic flow meter |
| 07/30/1985 | US4531545 Drilling choke valve |
| 07/24/1985 | EP0149290A2 Intermittently rotating drilling tool |
| 07/17/1985 | EP0148264A1 Process and apparatus for handling waste from oil well operations |
| 07/09/1985 | US4528102 Chemically cleaning aqueous fluid of insoluble solids |
| 07/09/1985 | US4527425 System for detecting blow out and lost circulation in a borehole |
| 07/02/1985 | US4526240 Method of inhibiting lost circulation from a wellbore |
| 07/01/1985 | EP0099884A4 Method and apparatus for treating waste rock cuttings. |
| 06/26/1985 | EP0145754A1 A method for removal of water from drill holes during deep drilling and a device for performing the method |
| 06/25/1985 | US4525285 Reacting sodium or potassium silicates with cations in drilling water to form seal |
| 06/25/1985 | US4524832 Diverter/BOP system and method for a bottom supported offshore drilling rig |
| 06/25/1985 | CA1189629A1 Apparatus for monitoring and controlling well drilling parameters |
| 06/19/1985 | EP0145151A1 Thixotropic cements for use in wells |
| 06/12/1985 | EP0144140A2 Materials for use in drilling muds |
| 06/06/1985 | WO1985002356A1 Liquid recovery unit |
| 06/05/1985 | EP0143508A2 Additive for water-base drilling fluid and process |
| 06/04/1985 | US4521232 For use in earth drilling operations |
| 06/04/1985 | US4520879 Ratchet and hydraulic seal assembly for rotating hollow shafts |
| 06/04/1985 | US4520665 System for detecting a native reservoir fluid in a well bore |
| 06/04/1985 | CA1188293A1 Drill cuttings conveying head with wet cuttings diverter |
| 05/29/1985 | EP0142545A1 Drilling equipment |
| 05/28/1985 | US4519848 Cleaning material from particles |
| 05/28/1985 | US4519576 Oil well safety valve for use with drill pipe |
| 05/28/1985 | US4519574 Auxiliary controlled valve disposed in a drilling string |
| 05/28/1985 | CA1187688A1 Slurry excavating method |
| 05/22/1985 | EP0142407A1 Method for delaying gelation of aequeous polymer solutions, solutions obtained by said method, and their use in oil wells |
| 05/21/1985 | US4518568 System to produce a brine-based drilling fluid |
| 05/15/1985 | EP0141117A1 Rock and gravel drilling method and rock-drill therefor |
| 05/15/1985 | EP0140939A1 Drilling choke valve |
| 05/14/1985 | US4516860 Mixer for drill cuttings and drilling mud on a drilling location |
| 05/14/1985 | US4516633 Blind shaft drilling |
| 05/07/1985 | US4515699 Chemically cleaning drilling/completion/packer brines |
| 05/07/1985 | US4515607 Methane, water and coal slurry |
| 05/07/1985 | US4515229 Drill bit assembly with fluid separator |
| 05/07/1985 | US4515218 Casing structures having core members under radial compressive force |
| 05/07/1985 | US4515216 Method of using thixotropic cements for combating lost circulation problems |
| 04/30/1985 | US4514308 Sulfonated asphalt |
| 04/30/1985 | US4514103 Safety guides for use with a rotary hose and kelly spinner hoses and the combination thereof |
| 04/30/1985 | CA1186242A1 Process and apparatus for recovering usable water and other materials from oil field mud/waste pits |
| 04/24/1985 | EP0138363A2 Single pass mud rejuvenation apparatus and method |
| 04/24/1985 | EP0137872A1 Well drilling and completion fluid composition |
| 04/23/1985 | US4512420 Downhole vortex generator |
| 04/23/1985 | US4512405 Pneumatic transfer of solids into wells |
| 04/17/1985 | EP0137683A2 Prevention of drilling fluid loss in subterranean formations |
| 04/16/1985 | US4510999 Well cleanup and completion method and apparatus |
| 04/16/1985 | US4510801 Controlled heater for drilling mud testing system |
| 04/16/1985 | US4510800 Drilling mud testing system having a thermally isolated pump |
| 04/16/1985 | CA1185594A1 Drill cuttings conveying apparatus with flexible duct for improved ground clearance |
| 04/10/1985 | EP0136373A1 Process for washing drill cuttings |
| 04/10/1985 | EP0136369A1 Flow line filter apparatus |
| 04/09/1985 | US4509606 Axial return hammer |
| 04/02/1985 | US4508183 Method and apparatus for lubricating a drill bit |
| 04/02/1985 | CA1184854A1 Process for filtration of oil and gas well treatment fluids |
| 03/26/1985 | US4507735 Method and apparatus for monitoring and controlling well drilling parameters |