| 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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| 12/10/1985 | US4558219 For use in evaluating fluid flow rates |
| 10/08/1985 | US4545432 Device for retrieving objects from wells |
| 10/01/1985 | CA1194412A1 Retrieving objects from wells |
| 07/09/1985 | CA1190146A1 Device for appplying plugging mix to well walls |
| 07/02/1985 | US4526242 Drilling device |
| 05/07/1985 | US4515212 Internal casing wiper for an oil field well bore hole |
| 04/23/1985 | US4512398 Pump-out plug catcher |
| 03/19/1985 | US4505341 Combination clean-out and drilling tool |
| 03/05/1985 | CA1183517A1 Combination clean-out and drilling tool |
| 01/15/1985 | US4493383 Well clean out tool |
| 10/23/1984 | US4478285 Method and apparatus for removal of downhole well debris |
| 09/11/1984 | US4470457 Device for the transfer of plugging and grouting materials to, and their processing at, a pre-set level in a well |
| 07/11/1984 | EP0113201A1 Device for retrieving objects from wells |
| 04/17/1984 | CA1165756A1 Arrangement for full hole drilling |
| 03/27/1984 | US4438813 Device for applying plugging mix to well walls |
| 12/27/1983 | CA1159441A1 Rotary bit with jet nozzles |
| 12/20/1983 | US4421982 Apparatus and method for downhole injection of radioactive tracer |
| 12/20/1983 | US4421182 Combination clean-out and drilling tool |
| 12/20/1983 | US4421166 Apparatus for injecting material into a well-bore |
| 11/22/1983 | CA1157462A1 Internal fluid screen to prevent nozzle and port plugging |
| 11/15/1983 | US4415269 Device for providing a reinforced foam lining for well bore holes |
| 10/04/1983 | US4407368 Polyurethane ball sealers for well treatment fluid diversion |
| 09/29/1983 | WO1983003279A1 Combination clean-out and drilling tool |
| 09/13/1983 | US4404093 Removing floating contaminants from water wells |
| 06/28/1983 | US4390064 Junk basket |
| 03/29/1983 | US4378050 Arrangement for full hole drilling |
| 01/18/1983 | US4369002 Method of emptying pipes driven into earth in nontrench laying and device for carrying same into effect |
| 01/18/1983 | US4368909 Oil well bailer apparatus |
| 09/02/1982 | WO1982002923A1 Device for feeding and processing of pluging and cementing materials in a given section of bore hole |
| 07/27/1982 | US4341273 Rotary bit with jet nozzles |
| 07/13/1982 | US4338999 Knockout pin trap |
| 06/29/1982 | US4336850 Internal fluid screen to prevent nozzle and port plugging |
| 06/22/1982 | US4335793 Process and apparatus for boring sites |
| 01/13/1982 | EP0043609A1 Rotary bit with jet nozzles |
| 12/22/1981 | CA1114737A1 Polyurethane ball sealers for well treatment fluid diversion |
| 10/27/1981 | US4296823 Cable tool with circulating drill stem |
| 10/27/1981 | US4296822 Multipurpose fluid flow assisted downhole tool |
| 09/29/1981 | US4291763 Dispenser for oil well treating chemicals |
| 07/07/1981 | US4276931 Junk basket |
| 06/23/1981 | CA1103654A1 No translation available |
| 09/23/1980 | US4223870 Bailer for top head drive rotary well drills |
| 08/19/1980 | US4217966 Junk basket, bit and reamer stabilizer |
| 03/25/1980 | US4194567 Method and apparatus for balancing pressures in an oil well |
| 03/25/1980 | US4194561 Placement apparatus and method for low density ball sealers |
| 02/26/1980 | US4190113 Well cleanout tool |
| 02/19/1980 | US4189012 Earth boring tool |
| 02/12/1980 | US4187909 Method and apparatus for placing buoyant ball sealers |
| 11/01/1979 | WO1979000859A1 Process and tool for ground drilling |
| 06/12/1979 | CA1056366A1 Rock drilling apparatus and method |
| 05/29/1979 | US4156471 Rubble and core removal apparatus |
| 03/27/1979 | CA1051416A1 Core and cuttings automatic recovery system |
| 11/14/1978 | US4125167 Big hole bit |
| 10/31/1978 | US4122905 Hand auger |
| 09/05/1978 | US4111262 Junk boot |
| 07/25/1978 | US4102413 Rock drilling apparatus and method |
| 07/11/1978 | US4099584 Flame jet tool for drilling to great depths |
| 07/04/1978 | US4098698 Compressed air, decompression |
| 04/25/1978 | US4086035 Bailer pumps for oil wells |
| 04/18/1978 | US4084636 Hydraulic junk retriever |
| 12/20/1977 | US4063374 Grave opening and closing machine |
| 11/29/1977 | US4060140 Method and apparatus for preventing debris build-up in underwater oil wells |
| 11/22/1977 | US4059155 Junk basket and method of removing foreign material from a well |
| 08/23/1977 | US4043150 Safety sleeve |
| 07/26/1977 | US4037662 Automated bailing apparatus in flexible combination for bailing shallow wells |
| 03/08/1977 | US4010712 Coating applicator tool for well casing |
| 12/14/1976 | US3997010 Downhole forward and back scuttling tool |
| 02/17/1976 | US3938598 Belling apparatus |
| 01/27/1976 | US3934660 Flexpower deep well drill |