| 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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| 03/10/1994 | DE4228951C1 Air lance to reveal cables buried in the ground etc. - has grip and release valve located on housing away from modulator, and spring tension setting screw on housing |
| 03/08/1994 | US5292429 Thermal distillation |
| 03/02/1994 | EP0584110A1 A method and an arrangement for controlling the supply of air into a rock drilling machine. |
| 02/08/1994 | US5284213 Subsea drilling cuttings collector and method of drilling |
| 02/08/1994 | US5284207 Method of cleaning a well bore prior to a cementing operation |
| 02/08/1994 | US5284084 For reciprocating inside of a cylinder |
| 02/01/1994 | US5282653 Coupling apparatus |
| 02/01/1994 | US5282384 Method for calculating sedimentary rock pore pressure |
| 01/25/1994 | US5280825 Device and installation for the cleaning of drains, particularly in a petroleum production well |
| 01/25/1994 | CA1326380C Device for driving a drilling and/or percussion tool |
| 01/19/1994 | CN2153630Y Mixing water temp. automatic device for borehole of oil well |
| 01/18/1994 | CA2100389A1 Valve having releasable latch mechanism |
| 01/12/1994 | EP0578034A1 Method and device for drilling an earth borehole |
| 01/12/1994 | CN2152902Y Sand removal centrifuger for purifying drilling fluid |
| 01/12/1994 | CN2152901Y Sludge cleaning device for shallow well |
| 01/05/1994 | CN2152071Y Centrifugal sand and stone water pump positive and negative circulation device |
| 01/04/1994 | US5275040 Method of and apparatus for detecting an influx into a well while drilling |
| 12/23/1993 | WO1993025794A1 Well drilling tools |
| 12/22/1993 | CN2150326Y Eblow drilling-liquid filtering device |
| 12/16/1993 | DE4225806C1 Drilling bit mounting for boring large holes - has clamp within drilling tube with radial expansion against eccentric type carrier |
| 12/16/1993 | DE4217373A1 Mixt. or suspension prepn. appts. - has continuous mixer providing controlled continuous output |
| 12/14/1993 | US5269386 Self positioning dust seal holder |
| 12/14/1993 | US5269384 Method and apparatus for cleaning a bore hole |
| 12/14/1993 | CA1325278C Method of analysing fluid influxes in hydrocarbon wells |
| 12/14/1993 | CA1325204C Mud saver valve |
| 12/12/1993 | CA2071089A1 Precision drill grinding collector |
| 12/09/1993 | WO1993024729A1 Portable oil-drilling waste recovery system |
| 12/09/1993 | DE4232560C1 Earth-drilling auger device - has screw shaft bore provided with check valve |
| 12/09/1993 | CA2136729A1 Portable oil-drilling waste recovery system |
| 12/01/1993 | EP0572055A1 Method for detecting drillstring washouts |
| 12/01/1993 | CN2148172Y Miniature swivel |
| 12/01/1993 | CN2148171Y Dismountable magnetic treating device for oil field water flooding |
| 12/01/1993 | CN1078926A Method for separating drilling cuttings from drilling fluid and completion fluid by using electric field |
| 11/30/1993 | US5265680 Method for installing instruments in wells |
| 11/24/1993 | EP0417084B1 Blowout preventer |
| 11/10/1993 | CN2145859Y Well filter |
| 11/09/1993 | US5259463 Throttle lever system for a percussive, fluid-activated apparatus |
| 11/03/1993 | CN2145259Y Sand and mut eliminiting combined cleaner for drilling liquid |
| 10/28/1993 | WO1993021418A1 Use of pressurized medium in drilling |
| 10/28/1993 | CA2132426A1 Use of pressurized medium in drilling |
| 10/26/1993 | US5255741 Process and apparatus for completing a well in an unconsolidated formation |
| 10/19/1993 | US5253961 Coupling for drilling machine with dust extractor |
| 10/19/1993 | US5253704 High pressure automatic mud saver valve |
| 10/15/1993 | CA2093062A1 Drill string enclosure |
| 10/14/1993 | WO1993020331A1 Sub-assembly for dust suppression in rock drilling |
| 10/14/1993 | WO1993020328A1 Cuttings processing system |
| 10/13/1993 | EP0565187A1 Drilling muds effective at high temperature |
| 10/13/1993 | EP0553134A4 A method of disposing of drilling wastes |
| 10/06/1993 | EP0563268A1 Coupling apparatus |
| 10/06/1993 | EP0496850A4 Drill cuttings disposal method and system |
| 10/06/1993 | CN1022341C Solidification control system for well drilling liguid |
| 10/05/1993 | US5250175 Vaporization, removal; water pollution control |
| 10/05/1993 | US5249635 Method of aerating drilling fluid |
| 09/21/1993 | US5246203 Oilfield valve |
| 09/21/1993 | US5246080 High pressure converter for deep well drilling |
| 09/21/1993 | US5246079 High-efficiency earth boring system |
| 09/15/1993 | CN1022119C Method for preventing lost circulation fluid for oil field drilling operations |
| 09/14/1993 | US5244050 Rock bit with offset tool port |
| 09/14/1993 | CA1322194C Combustion operated drilling apparatus |
| 09/08/1993 | EP0559127A1 Self-contained closure mechanism for a core barrel inner tube assembly |
| 09/07/1993 | US5242026 Method of and apparatus for drilling a horizontal controlled borehole in the earth |
| 09/07/1993 | CA2090845A1 Self-contained closure mechanism for a core barrel inner tube assembly |
| 09/02/1993 | WO1993017217A1 Fluid system for controlling fluid losses during hydrocarbon recovery operations |
| 09/01/1993 | CN2141459Y Automatic open and close well drilling combined lock gate |
| 08/31/1993 | US5240083 Device for removing drillhole debris |
| 08/19/1993 | WO1993015361A3 Removal of contaminants |
| 08/18/1993 | EP0555965A2 Controlled gas trap system |
| 08/17/1993 | US5236605 Settling tanks; top layer removal; sprayer; pollution control |
| 08/15/1993 | CA2086876A1 Controlled gas trap system |
| 08/10/1993 | US5234577 Treating with a carboxylic acid; washing with an aqueous alkaline solution; agitation |
| 08/10/1993 | US5234052 Cementing a casing string within a well bore |
| 08/05/1993 | WO1993015361A2 Removal of contaminants |
| 08/05/1993 | WO1993015302A1 In-line sub for drilling equipment |
| 08/05/1993 | WO1993005366A3 Mass flow meter |
| 08/05/1993 | CA2128878A1 In-line sub for drilling equipment |
| 08/05/1993 | CA2127703A1 Removal of contaminants |
| 08/04/1993 | EP0554013A1 Drill stem testing with tubing conveyed perforation |
| 08/04/1993 | EP0553134A1 A method of disposing of drilling wastes. |
| 08/03/1993 | US5232059 Apparatus for mixing and injecting a slurry into a well |
| 08/03/1993 | CA1320903C Apparatus for use in wells |
| 07/29/1993 | DE4302063A1 Drill bit for hammer drill - has passageway for cooling medium formed by grooves in drill bit shank and outer tube |
| 07/29/1993 | DE4301985A1 Method repairing of cracks in concrete structure - by injecting liquid cement into drilled hole which extends beyond crack |
| 07/28/1993 | EP0491841A4 Pore pressure prediction method |
| 07/28/1993 | CA2088028A1 A device for rotary-percussion with inverted fluid flow |
| 07/27/1993 | US5230390 Self-contained closure mechanism for a core barrel inner tube assembly |
| 07/27/1993 | US5230389 Fluidic oscillator drill bit |
| 07/27/1993 | US5230388 Method and apparatus for cleaning a bore hole using a rotary pump |
| 07/27/1993 | US5230363 Suction valve for high pressure slurry pump |
| 07/27/1993 | CA1320685C Method of separating and recovering a granulate from a viscous suspension containing said granulate, and apparatus for carrying out said method |
| 07/22/1993 | WO1993013882A1 Improved method of disposal of contaminated cuttings |
| 07/21/1993 | EP0198060B1 Method and apparatus for combined jet and mechanical drilling |
| 07/20/1993 | US5228524 Fluid system for controlling fluid losses during hydrocarbon recovery operations |
| 07/20/1993 | US5228506 Spill collection system for wellheads |
| 07/15/1993 | DE4200502A1 Verbesserte entsorgung von kontaminiertem bohrklein aus geologischen bohrungen mit mineraloel-enthaltenden bohrspuelsystemen Improved disposal of contaminated drill cuttings from geological drilling with mineral oil-containing drilling fluids |
| 07/14/1993 | EP0551134A1 Method for evaluating formations and bit conditions |
| 07/08/1993 | WO1993013292A1 Method and device for reestablishment of circulation in an operating well |
| 07/08/1993 | WO1993013291A1 Arrangement for removing drill cuttings in connection with well drilling in the sea bottom |
| 07/07/1993 | EP0550272A1 The control of fluid flow in oil wells |
| 06/29/1993 | CA1319637C Method and system for treating drill cuttings slurries and the like |
| 06/24/1993 | WO1993012321A1 Apparatus for filtering cuttings from drilling fluid |