| Patents for E21B 12 - Accessories for drilling tools (993) |
|---|
| 11/17/1998 | US5836387 System for securing an item in a tubular channel in a wellbore |
| 10/27/1998 | US5826651 Wellbore single trip milling |
| 09/29/1998 | US5813480 Method and apparatus for monitoring and recording of operating conditions of a downhole drill bit during drilling operations |
| 09/15/1998 | US5806595 Wellbore milling system and method |
| 09/09/1998 | EP0697057A4 Drill bit and other downhole tools |
| 08/18/1998 | US5794720 Method of assaying downhole occurrences and conditions |
| 08/06/1998 | WO1998034007A1 Tool and method for drilling a lateral well |
| 08/06/1998 | WO1998034006A1 Tool for making an opening in a tubular in a wellbore |
| 06/16/1998 | US5767671 Method of testing the lifeline of coiled tubing |
| 05/27/1998 | EP0844364A2 Device for removing drill cuttings from augers |
| 04/23/1998 | WO1998016714A1 Soil auger and mechanical soil sampler |
| 04/23/1998 | WO1998016712A1 Apparatus and method for drilling boreholes |
| 02/05/1998 | WO1998004804A1 Apparatus and method for milling a hole in casing |
| 01/07/1998 | EP0815344A1 Whipstock |
| 01/06/1998 | US5704436 Method of regulating drilling conditions applied to a well bit |
| 11/18/1997 | CA2030520C Vibration analysis drilling control device and process thereof |
| 10/29/1997 | EP0803638A2 Method of testing coiled tubing |
| 10/25/1997 | CA2203484A1 Method of testing coiled tubing |
| 10/15/1997 | EP0801207A2 Drilling tool with marking element |
| 10/02/1997 | WO1997036090A1 Method of regulating drilling conditions applied to a well bit |
| 10/02/1997 | WO1997036084A1 Method of assaying downhole occurrences and conditions |
| 09/25/1997 | DE19606630C1 Soil sample extraction device |
| 08/12/1997 | US5655610 Auger cleaner |
| 07/29/1997 | US5651420 For drilling a borehole in an earth formation |
| 06/12/1997 | DE19542091C1 Bore sample extraction device |
| 01/08/1997 | CN2244606Y Big caliber inserted engineering drill rod joint |
| 01/02/1997 | EP0750716A1 Milling tool |
| 11/27/1996 | EP0744525A1 A device for removing debris from a helical drilling tool |
| 10/16/1996 | CN2237712Y Suction matching device for hollow rod rotary bolt pump sleeve |
| 10/03/1996 | WO1996030622A1 Whipstock |
| 09/04/1996 | EP0730064A1 Trenching apparatus for digging deep trenches |
| 08/28/1996 | EP0728915A2 Method and apparatus for monitoring and recording of operating conditions of a downhole drill bit during drilling operations |
| 07/02/1996 | US5531271 Wellbore tool side support |
| 06/26/1996 | EP0717808A1 Apparatus for use in a wellbore |
| 06/12/1996 | CN2228969Y Hydraulic reduced screw stabilizer |
| 05/01/1996 | CN2226139Y Cleaner for thread of drilling tool |
| 04/23/1996 | US5509490 For preventing mud interference to a portion of a drill string |
| 02/21/1996 | EP0697057A1 Drill bit and other downhole tools |
| 02/01/1996 | WO1996002728A1 Emf sacrificial anode sub and method to deter bit balling |
| 09/28/1995 | WO1995025875A1 Milling tool |
| 09/26/1995 | US5452759 Whipstock system |
| 08/08/1995 | US5438860 Cutter bit abrasive detecting device of shield machine |
| 07/04/1995 | US5429187 Milling tool and operations |
| 06/20/1995 | US5425417 Wellbore tool setting system |
| 05/17/1995 | CN2197453Y Stabilizer for blade drilling bit |
| 05/16/1995 | US5415030 For investigating properties of subsurface formations traversed by borehole |
| 05/04/1995 | WO1995007404A3 Apparatus for use in a wellbore |
| 04/25/1995 | US5409060 Wellbore tool orientation |
| 04/18/1995 | CA2036118C Replaceable wear element and method |
| 03/16/1995 | WO1995007404A2 Apparatus for use in a wellbore |
| 12/07/1994 | CN2184772Y Tooth wheel drill bit jet taker |
| 11/24/1994 | WO1994027023A1 Drill bit and other downhole tools |
| 11/02/1994 | CN2181563Y Additional fastening device for bell mouth of electric coal drill |
| 10/27/1994 | WO1994024539A1 Apparatus for indicating wear |
| 07/19/1994 | US5330016 Drill bit and other downhole tools having electro-negative surfaces and sacrificial anodes to reduce mud balling |
| 05/04/1994 | CN2163862Y Drilling depth indicator for submerged hole drills |
| 04/26/1994 | US5305836 System and method for controlling drill bit usage and well plan |
| 03/02/1994 | EP0417263B1 Control device and process for drilling by vibration analysis |
| 02/23/1994 | CN2157300Y Bit grinding and draw-out machine |
| 12/22/1993 | CN2150323Y Slag bridge for gear wheel drilling machine |
| 12/14/1993 | CA1325108C Self-centering arrangement for grinding the hardmetal pins of drill bits |
| 09/25/1993 | CA2064387A1 Pneumatcal, mechanical merc containment skirt |
| 09/07/1993 | US5242027 Cleaning device for earth augers |
| 07/27/1993 | US5230388 Method and apparatus for cleaning a bore hole using a rotary pump |
| 07/22/1993 | DE4209854C1 Stripper for earth auger for excavator - incorporates spring blade between turns of spiral, moving axially as spiral rotates |
| 07/14/1993 | EP0551134A1 Method for evaluating formations and bit conditions |
| 06/08/1993 | US5216917 Method of determining the drilling conditions associated with the drilling of a formation with a drag bit |
| 06/08/1993 | CA1318910C Rotary drill bit |
| 02/23/1993 | CA1313862C Method for detecting drilling events from measurement while drilling sensors |
| 12/30/1992 | CN2126307U Underground speed reducer |
| 12/23/1992 | CN2125688U Displacement control diameter-changing stabilizer |
| 11/24/1992 | CA1310753C Wear determination method for a tool cutting element during the drilling of a rock formation |
| 09/10/1992 | DE4107678A1 Annular tooth load sensor for roller tunnelling tool - has measuring points and evaluator on drill head, with measuring points fitted with magnetic field sensors |
| 09/10/1992 | DE4107676A1 Roller tunnelling tool monitoring axle load measurement - forms load independent of over-roll signal from strain gauges, recessed into axle at measurement point under rollers |
| 08/25/1992 | US5141061 Method and equipment for drilling control by vibration analysis |
| 03/31/1992 | CA1298394C Method of determining drill bit wear |
| 03/11/1992 | CN1015784B Device for grinding hardmetal pins of drill bits |
| 02/06/1992 | WO1992001857A1 Drilling method and drill bit equipment |
| 01/15/1992 | EP0466255A2 Method of determining the drilling conditions associated with the drilling of a formation with a drag bit |
| 12/10/1991 | US5070654 Self-centering arrangement for grinding the hardmetal pins of drill bits |
| 08/21/1991 | EP0442449A2 Replaceable wear element |
| 05/29/1991 | EP0428904A2 Scraper device for continuous screw drills |
| 05/15/1991 | EP0427454A2 Auger cleaner |
| 03/20/1991 | EP0417263A1 Control device and process for drilling by vibration analysis. |
| 12/18/1990 | US4978173 Tooth holder |
| 10/01/1990 | WO1990012195A1 Control device and process for drilling by vibration analysis |
| 09/19/1990 | CN2062486U Interlocking device of electric coal drill protector |
| 09/18/1990 | US4958125 Method and apparatus for determining characteristics of the movement of a rotating drill string including rotation speed and lateral shocks |
| 09/12/1990 | CN2061971U Simple disassembling device for drill rod |
| 07/11/1990 | EP0377235A1 Method and apparatus for determining a characteristic of the movement of a drill string |
| 06/06/1990 | EP0371906A2 Wellbore tool with hall effect coupling |
| 06/03/1990 | CA2003785A1 Method and apparatus for determining a characteristic of the movement of a drill string |
| 05/29/1990 | US4928521 Method of determining drill bit wear |
| 05/28/1990 | CA2002484A1 Wellbore tool with hall effect coupling |
| 05/23/1990 | DE3839003A1 Device for the removal of soil samples with a soil auger from three soil depths for soil investigations |
| 05/22/1990 | US4926950 Method for monitoring the wear of a rotary type drill bit |
| 05/22/1990 | US4926686 Method for determining the wear of the cutting means of a tool during drilling a rocky formation |
| 05/09/1990 | CN1041902A Self-centering arrangment for grinding hardmetal pins of drill bits |
| 04/25/1990 | EP0365497A2 A self-centering arrangement for grinding the hardmetal pins of drill bits |
| 04/25/1990 | CN2056441U Outside chip removal deep hole drill subatmospheric pressure unit |