| 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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| 06/26/1984 | US4456063 Adapted for use with a drilling rig |
| 06/26/1984 | US4456062 Flow diverter |
| 06/21/1984 | WO1984002374A1 Flow diverter |
| 06/21/1984 | WO1984002373A1 Flow diverter seal |
| 06/19/1984 | US4455241 Wellbore fluid |
| 06/19/1984 | EP0053117A4 Blender apparatus. |
| 06/19/1984 | CA1169418A1 Method and apparatus for the preparation of drilling mud |
| 06/19/1984 | CA1169414A1 Device in core barrels |
| 06/12/1984 | US4453598 Drilling mud displacement process |
| 06/12/1984 | US4453319 Aqueous drill cutting treatment apparatus and method |
| 06/12/1984 | CA1169047A1 Method and apparatus for reducing the differential pressure sticking tendency of a drill string |
| 06/07/1984 | WO1984002158A1 A method employed in long-hole drilling and a drill rod system |
| 06/05/1984 | US4452322 Drilling device for drilling a core in deep drill holes |
| 06/05/1984 | US4452321 Device in core barrels |
| 06/05/1984 | CA1168595A1 Method and apparatus for degassing liquids |
| 05/29/1984 | US4451377 Process for cleaning an oil-contaminated brine containing particulate drill cutting solids |
| 05/29/1984 | US4450907 Cleaning system for packer removal |
| 05/29/1984 | US4450905 Mud bucket |
| 05/22/1984 | US4449849 Method of removing water from earthen pits |
| 05/22/1984 | US4449594 Method for obtaining pressurized core samples from underpressurized reservoirs |
| 05/22/1984 | CA1167872A1 Bore hole mining |
| 05/15/1984 | US4448267 Door drilling Kelly |
| 05/15/1984 | CA1167435A1 Rock drilling apparatus |
| 05/08/1984 | US4447157 Fluid mixing system with inductor cleanout |
| 05/08/1984 | US4446610 Retrievable float valve assembly |
| 05/02/1984 | EP0107475A2 Drill bit assembly with fluid separator |
| 05/01/1984 | CA1166628A1 Rotary drilling drill string stabilizer-cuttings grinder |
| 05/01/1984 | CA1166627A1 Drilling sub |
| 04/26/1984 | WO1984001600A1 Retrievable inside blowout preventer valve apparatus |
| 04/25/1984 | EP0106834A2 Device for conveying a fluid under pressure to a rotative part of a machine |
| 04/25/1984 | EP0106702A2 Drill bit assembly having improved operational life |
| 04/25/1984 | EP0106701A2 Method and apparatus for lubricating a drill bit |
| 04/25/1984 | EP0106700A2 Drill bit assembly |
| 04/24/1984 | US4444401 Flow diverter seal with respective oblong and circular openings |
| 04/24/1984 | US4444280 For a portable drill rig |
| 04/24/1984 | US4444277 Apparatus and method for conditioning oil well drilling fluid |
| 04/24/1984 | US4444250 Flow diverter |
| 04/18/1984 | EP0105860A2 Rotation device, particularly for rotative tools |
| 04/17/1984 | US4442894 Unitary float valve and wiping plug retainer |
| 04/17/1984 | US4442892 Apparatus for stabbing and threading a safety valve into a well pipe |
| 04/17/1984 | CA1165854A1 Signalling within a borehole while drilling |
| 04/10/1984 | US4442241 Shear thickening composition |
| 04/03/1984 | US4440450 For actuating downhole flow control valves of a borehole mining tool |
| 04/03/1984 | US4440243 Drill cuttings conveying head with wet cuttings diverter |
| 04/03/1984 | US4440239 Method and apparatus for controlling the flow of drilling fluid in a wellbore |
| 04/03/1984 | CA1164854A1 Well drilling method |
| 04/03/1984 | CA1164794A1 Pressure balanced ball valve device |
| 03/29/1984 | WO1984001188A1 Hydrojet drilling means and method |
| 03/28/1984 | EP0103886A1 Pipe laying apparatus |
| 03/28/1984 | EP0103779A2 Removing contaminates from a well fluid and well system |
| 03/27/1984 | US4439069 Method and apparatus for disposing of drill cuttings at an offshore location |
| 03/13/1984 | US4436635 Process for filtration of oil and gas well treatment fluids |
| 03/13/1984 | US4436167 Method of excavating a pile hole and an apparatus therefor |
| 03/13/1984 | US4436166 Downhole vortex generator and method |
| 03/13/1984 | CA1163575A1 Degassing of drilling fluids |
| 03/06/1984 | US4434862 In a gas turbine drilling device for use in a borehole forming operation |
| 03/06/1984 | US4434861 Dust conveying and collecting system and method |
| 03/06/1984 | CA1163263A1 Elliptical flow drilling mud mixer and conditioner |
| 02/28/1984 | US4434028 Solvent extraction |
| 02/28/1984 | CA1162725A1 Drilling fluid composition |
| 02/22/1984 | EP0101158A2 Method and apparatus for monitoring and controlling well drilling parameters |
| 02/15/1984 | EP0100748A2 Sinking device for small casings, the interior of which is inaccessible |
| 02/14/1984 | US4431535 Purifying drilling mud |
| 02/14/1984 | US4431069 Method and apparatus for forming and using a bore hole |
| 02/14/1984 | US4430892 Pressure loss identifying apparatus and method for a drilling mud system |
| 02/14/1984 | CA1162042A1 Method for drying drilling mud |
| 02/08/1984 | EP0099884A1 Method and apparatus for treating waste rock cuttings |
| 02/07/1984 | US4429755 Drill with polycrystalline diamond drill blanks for soft, medium-hard and hard formations |
| 01/31/1984 | US4428842 Well reserve pit liquor treatment process |
| 01/31/1984 | US4428441 Method of drilling a deviated wellbore |
| 01/31/1984 | US4428430 Method for increasing fluid flow circulation |
| 01/31/1984 | US4428425 Single pass filtration of oil or gas well completion fluids |
| 01/31/1984 | CA1161426A1 Progressing cavity motor governing system |
| 01/31/1984 | CA1161398A1 Material separating machine |
| 01/24/1984 | US4427080 Apparatus for preventing differential sticking in wells |
| 01/24/1984 | US4427079 Intermittently rotatable down hole drilling tool |
| 01/24/1984 | US4427073 Deep water hydrostatic head control |
| 01/24/1984 | CA1161027A1 Gas hydrates drilling procedure |
| 01/24/1984 | CA1160950A1 Method of determining the depth of occurrence of a chemically reactive bed |
| 01/10/1984 | US4425243 Foaming agents for use in drilling for oil and gas |
| 01/10/1984 | CA1160214A1 Shank adaptor for rock-drilling machines |
| 01/10/1984 | CA1160211A1 Method and arrangement for improving cuttings removal and reducing differential pressure sticking of drill strings in wellbores |
| 01/03/1984 | US4423791 Method of inhibiting differential wall sticking in the rotary drilling of hydrocarbon wells |
| 01/03/1984 | US4423774 In a well tool |
| 12/27/1983 | US4422514 Pump for a reverse circulation rotary drilling rig |
| 12/27/1983 | US4422513 Gas hydrates drilling procedure |
| 12/27/1983 | CA1159441A1 Rotary bit with jet nozzles |
| 12/21/1983 | EP0096639A1 Drilling hammer |
| 12/20/1983 | US4421182 Combination clean-out and drilling tool |
| 12/20/1983 | US4420916 Method and apparatus for aligning and securing auxiliary equipment with respect to a well drilling platform |
| 12/13/1983 | US4420187 Stationary drill string rotary hydraulic mining tool and method of hydraulic mining |
| 12/06/1983 | CA1158227A1 Method and apparatus for recovering unstable cores |
| 12/06/1983 | CA1158178A1 Centrifugal degasser |
| 11/29/1983 | US4417600 Safety valve |
| 11/22/1983 | US4416672 Removing gas from drilling mud |
| 11/22/1983 | US4416547 Portable proportioning device |
| 11/22/1983 | US4416337 Drill head assembly |
| 11/22/1983 | CA1157462A1 Internal fluid screen to prevent nozzle and port plugging |
| 11/22/1983 | CA1157459A1 Swivel unit |
| 11/15/1983 | US4415206 Drill section and method of hydraulically mining mineral formations |