| 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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| 11/28/1995 | CA2043410C Seafloor drilling apparatus |
| 09/26/1995 | CA2020229C Well treatment method |
| 08/29/1995 | US5445229 Method and apparatus for drilling, cracking, and withdrawing earth cores |
| 07/26/1995 | EP0664374A1 Apparatus for disposal of material in a drilling well |
| 07/11/1995 | US5431238 Drilling tool for use in constructing large diameter piles, ventilating shafts and other similar mining works |
| 04/11/1995 | US5404949 Liquid sampling apparatus |
| 04/04/1995 | US5402850 Methods of using reverse circulating tool in a well borehole |
| 02/28/1995 | US5392856 Slickline setting tool and bailer bottom for plugback operations |
| 02/28/1995 | US5392850 To produce fluids from spaced apart zones in an earth formation |
| 01/26/1995 | DE4324956A1 Drilling grab |
| 12/14/1994 | EP0628700A2 A drilling tool for use in constructing large diameter boreholes |
| 12/08/1994 | DE4318736A1 Method and apparatus for taking gas and/or oil and/or water and/or solid samples during drilling operation |
| 11/10/1994 | WO1994024841A1 Post hole digger |
| 10/25/1994 | CA2016311C Well clean out tool |
| 09/29/1994 | WO1994021884A1 Clamshell grab for drilling cylindrical holes |
| 07/27/1994 | EP0607470A1 Automatic evacuation drilling bucket |
| 06/14/1994 | US5320363 Post hole digger |
| 05/26/1994 | DE4308856C1 Drilling appts. for producing tubed deep bore, partic. for pile foundations - involves rope excavator with free fall device to which a tube rotary machine is linked |
| 04/26/1994 | US5306911 Method for determining the flow rate of aqueous phases in a multiphase flow |
| 04/12/1994 | US5301759 Method and apparatus for core-sampling subsurface rock formations |
| 04/05/1994 | US5299639 Methods and apparatus for removing debris from a well bore |
| 03/31/1994 | WO1994007147A1 Single bore hole process and device allowing simultaneous videotechnical detection of groundwater direction and speed of flow |
| 03/23/1994 | CN1084244A Prodn. method for lead filled high gravity valve ball |
| 03/17/1994 | DE4230919A1 Einzel-Bohrloch-Verfahren und -Vorrichtung zur gleichzeitigen Ermittlung der Grundwasser-Strömungsrichtung und -geschwindigkeit Single-hole method and apparatus for the simultaneous determination of the groundwater flow direction and velocity |
| 03/03/1994 | WO1994004790A1 Protective arrangements for downhole tools |
| 01/05/1994 | DE4312451A1 Connector for well plugging charges - has perforated side wall and perforated end coupling elements |
| 01/04/1994 | US5275245 Device to facilitate creating foxholes with explosives and method of making the same |
| 12/28/1993 | US5273331 Post hole digger |
| 10/12/1993 | US5252000 Free product collector and method |
| 10/12/1993 | US5251701 Helical conveyor screw |
| 08/31/1993 | US5240074 Placing resin in a wellbore with explosive, firing explosive to cure resin to plug slots; reversible |
| 08/10/1993 | US5234062 Automatic evacuation drilling bucket |
| 07/15/1993 | DE4200426A1 Compartmented grooved rod soil sample removal unit with tubular casing - has filling slot and cutting edge moving against each other with control resulting across follower and stop ring. |
| 07/06/1993 | US5224556 Downhole activated process and apparatus for deep perforation of the formation in a wellbore |
| 07/06/1993 | US5224548 Apparatus and method for retrieving lost materials in slanted boreholes |
| 05/27/1993 | DE4216353C1 Means to embed bound waste material in borehole - including material waste container which lowered into borehole, container base with closable outlet and cover |
| 05/11/1993 | US5209534 Take-apart post hole digging tool |
| 04/01/1993 | WO1993006336A1 Downhole activated system for perforating a wellbore |
| 01/05/1993 | US5176208 Reverse circulation tool handling cuttings and debris |
| 11/10/1992 | US5161612 Well casing wash assembly |
| 10/29/1992 | WO1992018749A1 Device for collecting particulate matter and debris in horizontal or high deviation oil or gas wells |
| 10/13/1992 | US5154230 Polymerizing resin to form colsolidate matrix that prevents fl ow of sand |
| 09/08/1992 | US5145013 Sand control with resin and explosive |
| 08/19/1992 | EP0498925A1 Device for connecting tubes insertable into wells and filled with bentonite |
| 08/18/1992 | US5139089 Well cleanout tool and method |
| 08/04/1992 | US5135050 Device for collecting particulate matter and debris in horizontal or high-deviation oil or gas wells |
| 06/09/1992 | US5119874 Swab cup and swab assembly |
| 04/16/1992 | WO1992006271A1 Apparatus for releasing fluid into a well |
| 04/07/1992 | US5101900 Sand control in wells with gas generator and resin |
| 03/17/1992 | US5095976 Tubing sand pump |
| 11/26/1991 | US5067570 Auger and retaining shell assembly |
| 11/26/1991 | US5067569 Auger and sweeper assembly |
| 11/26/1991 | CA1292427C Method of locating hydrocarbon producing strata and the instrument therefor |
| 10/15/1991 | CA1290683C Oil well tool for in situ release of wellbore treatment fluid |
| 10/10/1991 | DE4010638A1 Underground storage of containers of radioactive waste |
| 09/10/1991 | US5047632 Method for determining dynamic flow characteristics of multiphase flows |
| 08/27/1991 | US5042598 Drilling fluid additive sweep cartridge and method |
| 07/30/1991 | US5035291 Seafloor drilling apparatus |
| 04/10/1991 | EP0421611A1 Method for selective plugging of a zone in a well |
| 02/13/1991 | EP0412477A1 Grab bucket provided with anchoring means to the trench wall |
| 12/18/1990 | CA1277975C Process to sink an in-ground pile, as well as boring machine and device used in said process |
| 12/05/1990 | EP0400707A2 Method for determining dynamic flow characteristics of multiphase flows |
| 11/27/1990 | US4972906 Method for selective plugging of a zone in a well |
| 11/27/1990 | CA2017322A1 Method for determining dynamic flow characteristics of multiphase flows |
| 11/20/1990 | US4971163 Drilling bucket apparatus for cast-in-place piles with expanded bottoms |
| 10/30/1990 | US4966233 Tracer deployment tools |
| 07/10/1990 | US4940092 Well clean out tool |
| 05/15/1990 | US4924940 Downhole cleanout tool |
| 05/01/1990 | CA1268414A1 Method and device for conveying chemicals through borehole |
| 05/01/1990 | CA1268413A1 Method and device for conveying chemicals through borehole |
| 04/18/1990 | EP0363899A1 Rotary bucket assembly |
| 02/27/1990 | US4904119 Process for placing a piling in the ground, a drilling machine and an arrangement for implementing this process |
| 11/28/1989 | US4882859 Excavating bucket having scoops |
| 07/11/1989 | US4846279 Method and means for introducing treatment fluid into a well bore |
| 05/10/1989 | EP0315547A1 Bucket excavator |
| 05/09/1989 | US4828026 Remotely operable downhole junk basket system |
| 03/09/1989 | WO1989002024A1 Oil well tool for in situ release of wellbore treatment fluid |
| 03/07/1989 | US4809778 Oil well tool for in situ release of wellbore treatment fluid |
| 02/21/1989 | US4805450 Measuring the mass flow rate of gas in a well |
| 12/13/1988 | US4790386 Method and means for introducing treatment composition into a well bore |
| 09/20/1988 | US4771635 Fluid injector for tracer element well borehole injection |
| 09/06/1988 | US4768591 Steam quality apparatus |
| 08/02/1988 | US4760881 Downhole steam sampler |
| 07/12/1988 | US4756365 For use in a cased wellbore |
| 05/03/1988 | US4741396 Hydrostatic syringe for depositing processing products in wells |
| 04/27/1988 | EP0265344A1 Method for producting a pile in the ground, drilling machine and device for carrying out such a method |
| 04/26/1988 | US4739829 Wireline operated oil well dump bailer |
| 03/09/1988 | EP0259170A2 Plug for use in wellbores |
| 01/26/1988 | US4721159 Method and device for conveying chemicals through borehole |
| 01/26/1988 | US4721156 Well clean out apparatus |
| 11/17/1987 | US4706753 Method and device for conveying chemicals through borehole |
| 11/04/1987 | EP0244076A2 Downhole circulation pump |
| 09/29/1987 | US4696343 Wireline dump bailer |
| 06/02/1987 | US4669555 Downhole circulation pump |
| 03/03/1987 | US4646843 For use in lifting a liquid from within a well |
| 02/03/1987 | US4640354 Method for actuating a tool in a well at a given depth and tool allowing the method to be implemented |
| 09/16/1986 | US4611664 Technique for placing a liquid chemical in a well or bore hole |
| 08/05/1986 | US4603739 Process for cleaning an oil field well bore hole using an internal casing wiper |
| 07/29/1986 | CA1208543A1 Well clean out tool |
| 03/26/1986 | EP0175536A2 Retrieval device |