| Patents for E21B 27 - Containers for collecting or depositing substances in boreholes or wells, e.g. bailers for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits (1,068) |
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| 01/09/2001 | US6170574 Method of forming cement seals in downhole pipes |
| 01/02/2001 | US6167962 Anti-wobbling bailer with high speed insertion |
| 12/28/2000 | WO2000079091A1 Piloted drill barrel and method of using same |
| 12/05/2000 | US6155342 Proppant containment apparatus |
| 12/03/2000 | CA2309798A1 Excavating tool |
| 11/15/2000 | CN2405662Y Powder-spraying device |
| 11/09/2000 | WO2000066878A1 Downhole sealing method and composition |
| 10/26/2000 | WO2000063524A1 Inflatable packer setting tool assembly |
| 10/26/2000 | DE19914839A1 Sub-surface ground water filter has water descending through cavity, filled with adsorbent between timbers forming sub-surface barrier within narrow trench |
| 10/11/2000 | EP1042584A1 A method and a tool for treating the wall of a critical zone in a borehole |
| 10/05/2000 | WO2000058602A1 Method and apparatus for cleaning boreholes |
| 09/14/2000 | WO2000053882A1 Drill for making wide diameter and high depth holes and method for carrying out said holes |
| 09/14/2000 | CA2365005A1 Drill for making wide diameter and high depth holes and method for carrying out said holes |
| 07/18/2000 | US6089632 Post hole digger |
| 05/25/2000 | WO2000029712A1 Apparatus for delivering a flowable substance to a remote location |
| 05/16/2000 | US6062320 Planting and post hole tool |
| 05/10/2000 | CN1052291C Excavator for vertical bores |
| 05/09/2000 | US6059890 Removal sand, silt impurities |
| 04/12/2000 | CN2373559Y Self-grouting well cementation valve |
| 03/30/2000 | DE19945852A1 Device for monitoring ground water flow in bore wells; has optical system between camera unit and measurement zone located in tube |
| 03/16/2000 | DE19859666A1 Device for removal of gravel and soil from the water filled drill hole, comprising of case, container with back pressure flap at bottom, and vacuum creating piston element |
| 03/09/2000 | DE19840764A1 Rising damp sealing of older building walls places solution bottles in angled boreholes for wall permeation via ventilated bottle runout sleeves with nonblocking runout holes. |
| 12/16/1999 | WO1999064715A1 Downhole milling device |
| 12/16/1999 | DE19931737A1 Conveyor barrel for removal of sediment from well shafts |
| 12/16/1999 | CA2334150A1 Downhole milling device |
| 12/01/1999 | CN1046987C Clamshell grab for drilling cylindrical holes |
| 11/09/1999 | CA2171855C Apparatus and method for perforating and fracturing |
| 09/28/1999 | US5957196 Apparatus for enhanced bioremediation of underground contaminants |
| 09/21/1999 | CA2139716C Methods of using reverse circulating tool in a well borehole |
| 09/11/1999 | CA2265039A1 Apparatus for removal of milling debris |
| 08/31/1999 | US5944100 Junk bailer apparatus for use in retrieving debris from a well bore of an oil and gas well |
| 08/19/1999 | DE19828304C1 Waste drum, especially radioactive waste drum, storage in a vertical borehole |
| 07/22/1999 | WO1999036664A1 Method of forming cement seals in downhole pipes |
| 07/20/1999 | CA2155916C Early evaluation system |
| 07/13/1999 | US5922197 Debris suppression device |
| 07/08/1999 | WO1999034093A1 A method and a tool for treating the wall of a critical zone in a borehole |
| 05/06/1999 | WO1999022112A1 Downhole cutting separator |
| 04/15/1999 | WO1999005386A3 Junk bailer for use in retrieving debris from a well |
| 03/16/1999 | US5881807 Injector for injecting a tracer into an oil or gas reservior |
| 03/09/1999 | US5878813 Apparatus and method for capturing and retrieving liquid sample using a weighed sampling device |
| 03/02/1999 | US5877390 Using gas pressure |
| 02/04/1999 | WO1999005386A2 Junk bailer for use in retrieving debris from a well |
| 02/04/1999 | CA2298011A1 Junk bailer apparatus for use in retrieving debris from a well bore of an oil and gas well |
| 01/21/1999 | DE19829992A1 Borehole sand and gravel pump with borehole casing and suction tube |
| 10/21/1998 | CN1196436A Device and process for operating working module |
| 09/23/1998 | EP0866210A2 Method for operating a tool and apparatus for transmission of rotary torque and speed of rotation of a drive unit to that tool |
| 09/22/1998 | US5810085 Drill hole plugging method utilizing sodium bentonite nodules |
| 09/01/1998 | US5799733 Method of servicing a well |
| 08/25/1998 | US5797202 Vertical hole excavating machine |
| 08/18/1998 | US5794698 Use of oleophilic wick for removing non-aqueous liquids from a subterranean formation |
| 08/04/1998 | US5787985 Proppant containment apparatus and methods of using same |
| 08/04/1998 | US5787984 Method and device for casing a well with a composite pipe |
| 07/23/1998 | DE19721823A1 Gravel pump |
| 07/23/1998 | DE19721814A1 Gravel pump with tubular pump body having top and bottom cylinders formed by piston |
| 05/01/1998 | CA2189369A1 Hydrocarbon bailer |
| 04/16/1998 | DE19644349C1 Rock drill cylindrical cover |
| 04/07/1998 | US5735356 Method of removing soil from a well |
| 02/17/1998 | US5718287 For injecting fluid into a wellbore |
| 12/06/1997 | CA2206959A1 Well boring method and apparatus |
| 11/04/1997 | US5682950 Means for collecting unwanted material in an oil or gas well |
| 10/22/1997 | EP0801704A1 Method for injecting fluid into a wellbore |
| 09/12/1997 | WO1997017526A3 Downhole assembly for installing an expandable tubing |
| 08/19/1997 | US5657822 Using tubular capsule filled with bentonite |
| 07/23/1997 | EP0785337A2 Proppant containment apparatus and methods of using same |
| 07/02/1997 | EP0781893A2 Apparatus and method for early evaluation and servicing of a well |
| 06/25/1997 | EP0780167A1 A method and apparatus for diffusing a chemical solution, a method and apparatus for injecting a liquid, and a method of remedying soil |
| 06/11/1997 | CN1151782A Excavator for vertical bores |
| 06/04/1997 | EP0777032A1 Excavator for vertical bores |
| 06/04/1997 | EP0689636B1 Clamshell grab for drilling cylindrical holes |
| 05/15/1997 | WO1997017526A2 Downhole assembly for installing an expandable tubing |
| 05/13/1997 | US5628366 Protective arrangements for downhole tools |
| 03/18/1997 | US5611400 Drill hole plugging capsule |
| 03/12/1997 | EP0760897A1 Injector for injecting a tracer into an oil or gas reservoir |
| 03/05/1997 | EP0604568B1 Downhole activated system for perforating a wellbore |
| 02/04/1997 | US5598891 Apparatus and method for perforating and fracturing |
| 01/28/1997 | US5597966 Fluid sampling device |
| 01/21/1997 | US5595245 Systems of injecting phenolic resin activator during subsurface fracture stimulation for enhanced oil recovery |
| 12/25/1996 | CN2243527Y Wriggling sand filtering pipe with metal wadding |
| 12/18/1996 | EP0748925A1 Method and device for casing a borehole with a deformable pipe |
| 12/10/1996 | US5582251 Downhole mixer |
| 10/18/1996 | CA2174174A1 Downhole mixer |
| 09/19/1996 | DE19529617C1 Rotary drilling bucket with cylindrical steel container |
| 09/10/1996 | US5553405 Power-assisted shovel truck equipped with a water-feeding device and a water-draining device |
| 08/13/1996 | US5544705 Method for injecting fluid into a wellbore |
| 07/30/1996 | US5540280 Method of servicing a well |
| 07/18/1996 | WO1996021794A1 Method for injecting fluid into a wellbore |
| 07/17/1996 | EP0722037A2 Apparatus for injecting fluid into a wellbore |
| 07/09/1996 | US5533570 Apparatus for downhole injection and mixing of fluids into a cement slurry |
| 06/05/1996 | CN1031952C Manufacturing method for lead filled and high density faner ball |
| 05/17/1996 | WO1996004521A3 Apparatus and method for perforating and fracturing |
| 05/01/1996 | CN2226144Y High-temp-and high-pressure-resistant integrated sieve tube |
| 04/03/1996 | CN1119884A Clamshell grab for drilling cylindrical holes |
| 03/12/1996 | US5497714 Planting hole digger |
| 03/06/1996 | EP0699819A2 Method and apparatus for well testing or servicing |
| 02/29/1996 | WO1996006262A1 Excavator for vertical bores |
| 02/15/1996 | WO1996004521A2 Apparatus and method for perforating and fracturing |
| 01/03/1996 | EP0689636A1 Clamshell grab for drilling cylindrical holes |
| 12/26/1995 | US5478128 Clamshell action post hole digger |
| 12/07/1995 | WO1995033121A1 Injector for injecting a tracer into an oil or gas reservoir |
| 12/07/1995 | CA2191739A1 Injector for injecting a tracer into an oil or gas reservoir |