| 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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| 03/02/2000 | WO2000011304A1 Reverse circulation drilling system with bit locked underreamer arms |
| 03/02/2000 | WO2000010680A1 Apparatus and method for handling waste |
| 03/02/2000 | CA2338579A1 Reverse circulation drilling system with bit locked underreamer arms |
| 03/01/2000 | EP0981678A1 Arrangement in a drilling apparatus |
| 03/01/2000 | EP0774040B1 Erosion resistant downhole mud diverter tool |
| 03/01/2000 | EP0616660B1 Method of propagating a hydraulic fracture using fluid loss control particulates |
| 03/01/2000 | CN2366549Y Double direction clean-out rig of oil/water well |
| 02/29/2000 | US6029824 Screen for vibrating separator |
| 02/29/2000 | US6029746 Self-excited jet stimulation tool for cleaning and stimulating wells |
| 02/24/2000 | DE19802691C1 Salvage method for cables, leads or other comparable elongated units from ground |
| 02/23/2000 | CN2365390Y Drum desander |
| 02/17/2000 | WO2000008295A1 An apparatus and method for killing a subsea well |
| 02/15/2000 | US6024228 Bypass diverter box for drilling mud separation unit |
| 02/15/2000 | US6024168 Wellborne mills & methods |
| 02/13/2000 | CA2280248A1 By-pass sub |
| 02/09/2000 | CN1244230A Closed device for treatment of drilling fluids and cuttings |
| 02/03/2000 | WO2000005506A2 Annular fluid manipulation in lined tubular systems |
| 02/03/2000 | WO2000005323A1 Aphron-containing well drilling and servicing fluids of enhanced stability |
| 02/02/2000 | CN2361824Y Automatic controller for mine emulsion pump station |
| 02/01/2000 | US6019181 Core drilling latch assembly |
| 01/27/2000 | WO2000004272A1 Drill string retrieving apparatus |
| 01/27/2000 | WO2000004269A2 Subsea wellbore drilling system for reducing bottom hole pressure |
| 01/27/2000 | WO2000003600A2 Improved tubing handling for subsea oilfield tubing operations |
| 01/27/2000 | CA2342112A1 Drill string retrieving apparatus |
| 01/26/2000 | EP0974729A1 A screw drilling device |
| 01/20/2000 | WO2000003115A1 Boring device |
| 01/20/2000 | WO1997037102A3 Downhole flow control devices |
| 01/20/2000 | DE19831383A1 Power tool with integrated dust collection container, which is particularly safely joined with valve on dust inlet and hook on top and has easy exchangeable filter positioned in top lid |
| 01/19/2000 | EP0868594B1 Water separator for a down hole drill |
| 01/19/2000 | CN2359448Y Apparatus for flusing borehole |
| 01/19/2000 | CN1048518C Additives composition using for blended drilling fluid and its producing process |
| 01/13/2000 | WO2000001926A1 Method and tool for fracturing an underground formation |
| 01/13/2000 | DE19831009A1 Bohrvorrichtung Drilling device |
| 01/05/2000 | EP0969183A2 Plug |
| 01/05/2000 | EP0969181A2 Diverter apparatus |
| 01/05/2000 | EP0839255A4 Safeguarded method and apparatus for fluid communication using coiled tubing, with application to drill stem testing |
| 01/04/2000 | US6009959 Oil and gas well cuttings disposal system with continuous vacuum operation for sequentially filling disposal tanks |
| 01/04/2000 | US6009747 Method for evaluating drilling fluids |
| 12/29/1999 | EP0966403A1 Process for cleaning fluids with particulate solids |
| 12/28/1999 | US6007105 Swivel seal assembly |
| 12/22/1999 | EP0837978B1 Single trip whipstock assembly |
| 12/21/1999 | US6003834 Fluid circulation apparatus |
| 12/21/1999 | US6003622 Drill tube for use in upward rock drilling |
| 12/16/1999 | WO1999064713A1 A drilling tool |
| 12/16/1999 | WO1999064356A1 Processing system |
| 12/15/1999 | EP0963502A1 Downhole clutch with flow ports |
| 12/15/1999 | CN2353885Y Multifunction eccentric water-distributor |
| 12/14/1999 | US6000468 Method and apparatus for the downhole metering and control of fluids produced from wells |
| 12/09/1999 | WO1999051850A3 Underground cable and pipelaying |
| 12/08/1999 | EP0961866A1 Closed device for treatment of drilling fluids and cuttings |
| 12/07/1999 | US5997652 Food starch processing method and apparatus |
| 12/07/1999 | US5996484 Drilling fluid recovery defluidization system |
| 12/07/1999 | CA2184511C Apparatus and method for separating components in well fluids |
| 12/02/1999 | WO1999061746A1 Generating commands for a downhole tool |
| 12/02/1999 | WO1999061745A1 Arrangement for the removal of cuttings and gas arising from drilling operations |
| 12/02/1999 | WO1999050524A3 Subsea mud pump |
| 12/01/1999 | EP0960261A1 Tool and method for drilling a lateral well |
| 12/01/1999 | EP0960259A1 Aphron-containing well drilling and servicing fluids |
| 12/01/1999 | EP0960254A1 Reverse circulation drilling system with bit locked underreamer arms |
| 12/01/1999 | EP0815343B1 Flow control tool |
| 12/01/1999 | CN2351213Y Efficient line motion fine-mesh vibrating screen |
| 11/30/1999 | US5992544 Fire suppression apparatus for well drilling system |
| 11/30/1999 | US5992543 Core drilling latch assembly |
| 11/23/1999 | US5988397 Screen for vibratory separator |
| 11/18/1999 | WO1999035365A3 Downhole pressure intensifier for jet cutting |
| 11/17/1999 | EP0956424A2 Method and device for driving bore holes, specially exploring and extraction drillings in the sea bottom |
| 11/17/1999 | CN1235628A Enhanced multicomponent mixtures for soil decomposition |
| 11/17/1999 | CN1235627A Method for facilitated waste disposal of working substances based on W/O invert emulsions |
| 11/16/1999 | US5985800 Invert emulsion fluids suitable for drilling |
| 11/16/1999 | US5984011 Method for removal of cuttings from a deviated wellbore drilled with coiled tubing |
| 11/11/1999 | WO1999057415A1 Device and method for measuring the flow rate of drill cuttings |
| 11/09/1999 | US5979572 Flow control tool |
| 11/02/1999 | US5977031 Ester based invert emulsion drilling fluids and muds having negative alkalinity |
| 11/02/1999 | US5975222 Reverse circulation drilling system with bit locked underreamer arms |
| 11/02/1999 | US5975219 Method for controlling entry of a drillstem into a wellbore to minimize surge pressure |
| 11/02/1999 | US5975129 Hydraulically operated pressure relief valve |
| 10/28/1999 | WO1999054588A1 Drilling fluid mixing apparatus and methods |
| 10/27/1999 | EP0951519A1 Process for the facilitated waste disposal of working substances based on water-in-oil invert emulsions |
| 10/27/1999 | CN2345677Y Automatic water stop device for preventing water oozed when drilling construction at mine underground |
| 10/27/1999 | CN1232741A Punching tool |
| 10/27/1999 | CA2270264A1 Water pressure posthole digger |
| 10/26/1999 | US5971307 Rotary grinder |
| 10/26/1999 | US5971305 Rotary shredder |
| 10/26/1999 | US5971159 Screen assembly for a vibratory separator |
| 10/26/1999 | US5971084 Cuttings tank apparatus |
| 10/26/1999 | US5971079 Casing filling and circulating apparatus |
| 10/20/1999 | EP0950794A2 Apparatus and method for completing a subterranean well |
| 10/20/1999 | EP0795074B1 Method and apparatus for drilling with high-pressure, reduced solid content liquid |
| 10/19/1999 | US5967816 Female wet connector |
| 10/19/1999 | US5967236 Spill control plug and method |
| 10/19/1999 | CA2098722C Coupling apparatus |
| 10/14/1999 | WO1999051852A1 Subsea diverter and rotating drilling head |
| 10/14/1999 | WO1999051850A2 Underground cable and pipelaying |
| 10/13/1999 | EP0948700A2 Whipstock |
| 10/13/1999 | EP0948577A1 Enhanced multicomponent mixtures for soil decomposition |
| 10/12/1999 | US5964304 Method and apparatus for drill cuttings transfer |
| 10/07/1999 | WO1999050528A1 Drillstring with stabilisers for re-entering a primary wellbore |
| 10/07/1999 | WO1999050524A2 Subsea mud pump |
| 10/07/1999 | CA2326353A1 Subsea mud pump |
| 10/06/1999 | EP0946669A1 Multiphase lubricant concentrates for use in water based systems in the field of exploratory soil drilling |