| 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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| 06/25/1995 | CA2139007A1 Device and method for remotely actuating an equipment - application to a boring string |
| 06/21/1995 | EP0621811B1 Improved method of disposal of contaminated cuttings |
| 06/20/1995 | USRE34975 Ultrasonic measurement apparatus |
| 06/20/1995 | US5425428 For permitting passage of a tool through the interior of a pipe |
| 06/20/1995 | US5425419 Whipstock apparatus and methods of use |
| 06/14/1995 | EP0657616A1 Auger device for piles foundations |
| 06/13/1995 | US5424283 Drilling muds effective at high temperature |
| 06/06/1995 | US5422012 Flocculation |
| 06/06/1995 | US5421420 Downhole weight-on-bit control for directional drilling |
| 05/23/1995 | US5417295 Method and system for the early detection of the jamming of a core sampling device in an earth borehole, and for taking remedial action responsive thereto |
| 05/16/1995 | US5415776 Horizontal separator for treating under-balance drilling fluid |
| 05/16/1995 | US5415030 For investigating properties of subsurface formations traversed by borehole |
| 05/11/1995 | WO1995012747A1 Method and system for exploring for and extraction of raw materials, minerals or the like in soft ground |
| 05/11/1995 | CA2175705A1 Method and system for exploring for and extraction of raw materials, minerals or the like in soft ground |
| 05/09/1995 | US5413175 Stabilization and control of hot two phase flow in a well |
| 05/09/1995 | US5412944 Severe service extractor valve |
| 05/09/1995 | US5412940 High pressure exhaust cleaning system |
| 05/02/1995 | US5411105 Drilling a well gas supply in the drilling liquid |
| 05/02/1995 | US5411104 Coalbed methane drilling |
| 05/02/1995 | US5411049 For controlling flow of a fluid in a conduit |
| 05/02/1995 | CA1335449C Drilling equipment |
| 04/25/1995 | US5409072 Method and an arrangement for controlling the supply of air into a rock drilling machine |
| 04/20/1995 | WO1995010764A1 Apparatus for testing a shear thickening plugging fluid |
| 04/20/1995 | DE4335417A1 Drilling or chiselling tool with extraction device |
| 04/18/1995 | US5407021 Down-the-hole hammer drill having reverse circulation |
| 04/18/1995 | US5407020 Pneumatic drilling chip removal system and method |
| 04/18/1995 | US5407019 Apparatus and method for environmental surveying for contaminants in alluvial materials and bedrock formations |
| 04/11/1995 | US5405223 Method for treating drill cuttings during oil and gas drilling |
| 04/11/1995 | US5404953 Blow-out prevention device for shutting off an annulus between a drill column and a well wall when drilling for oil or gas |
| 04/11/1995 | US5404945 Device for controlling the flow of fluid in an oil well |
| 04/06/1995 | WO1995009215A1 Non toxic, biodegradable well fluids |
| 04/06/1995 | DE4342484A1 Hand drill |
| 04/06/1995 | CA2172965A1 Non toxic, biodegradable well fluids |
| 04/04/1995 | US5403821 Water soluble copolymer containing a unsaturated acid and allyl ether compound |
| 04/04/1995 | US5402857 Oil and gas well cuttings disposal system |
| 04/04/1995 | US5402854 Fluid distributor for a debris flushing system in a percussive, fluid-activated apparatus |
| 03/28/1995 | CA2016566C Pipe connector with threaded seal in nonthreaded cavity |
| 03/21/1995 | US5399548 Tannin, lignite, lignin |
| 03/15/1995 | EP0642624A1 Method and apparatus for determining depth of drill cuttings |
| 03/14/1995 | CA2055421C Trenchless pipeline replacement |
| 03/07/1995 | CA1334623C Grouting composition |
| 02/28/1995 | US5392868 Directional multi-blade boring head |
| 02/28/1995 | US5392862 Flow control sub for hydraulic expanding downhole tools |
| 02/28/1995 | US5392851 Wireline cable head for use in coiled tubing operations |
| 02/28/1995 | US5392814 Water well rehabilitation apparatus |
| 02/22/1995 | CN2190157Y Bottom conical body for vortex sand remover |
| 02/21/1995 | US5390736 Anti-rotation devices for use with well tools |
| 02/14/1995 | US5388655 Injection boring anchor with auger blade |
| 02/14/1995 | US5388650 Non-cryogenic production of nitrogen for on-site injection in downhole drilling |
| 02/08/1995 | CN1027601C Heated scrubing valve |
| 02/07/1995 | CA2043756C Drill pipe bridge plug |
| 02/02/1995 | WO1995003475A1 Slimhole coring system |
| 02/02/1995 | WO1995003255A1 Process and device for dewatering tailings |
| 02/02/1995 | DE4325290A1 Wake nozzle |
| 02/01/1995 | EP0636202A1 Use of pressurized medium in drilling. |
| 02/01/1995 | CN1098162A Underground border with down hammer |
| 01/31/1995 | US5385669 Mining screen device and grid structure therefor |
| 01/31/1995 | US5385209 Throttle lever system for a percussive, fluid-activated apparatus |
| 01/10/1995 | US5379852 Core drill bit |
| 01/03/1995 | US5377551 Probe for penetrating and displacing particularly into a mass of pulverulent material |
| 12/28/1994 | CN2186294Y Drilling mud shaking sieve |
| 12/27/1994 | US5375669 Method and apparatus for cleaning a borehole |
| 12/22/1994 | WO1994029566A1 Non-cryogenic production of nitrogen for on-site injection in downhole drilling |
| 12/22/1994 | CA2149244A1 Non-cryogenic production of nitrogen for on-site injection in downhole drilling |
| 12/17/1994 | CA2124265A1 Method and system for the early detection of the jamming of a core sampling device in an earth borehole, and for taking remedial action responsive thereto |
| 12/13/1994 | US5372458 System for treating drilling mud containing potassium chloride (KCl) for disposal |
| 12/08/1994 | DE4318736A1 Method and apparatus for taking gas and/or oil and/or water and/or solid samples during drilling operation |
| 12/07/1994 | EP0627543A2 Underground borer with down hammer |
| 12/06/1994 | US5370181 Anti gas-migration cementing |
| 11/30/1994 | EP0626500A2 Directional multi-blade boring head |
| 11/29/1994 | CA2042649C Ultrasonic measurement apparatus and method |
| 11/26/1994 | CA2116267A1 Directional multi-blade boring head |
| 11/22/1994 | US5366030 Hydraulic device for forming a cavity in a borehole |
| 11/22/1994 | US5366009 Gravel pack well completions with auger-liner |
| 11/15/1994 | US5364064 Safety sub with asymmetrical wall elastomeric closure for retaining drilling fluids |
| 11/10/1994 | WO1994025723A1 Drill tube element |
| 11/10/1994 | WO1994025688A1 Process for sealing off ground sites and device for carrying out this process |
| 11/10/1994 | CA2160790A1 Drill tube element |
| 11/09/1994 | EP0623663A1 Aqueous drilling muds fluidified by means of zirconium and aluminium complexes |
| 11/08/1994 | US5361998 Plant for treating drill cuttings |
| 11/08/1994 | US5361855 Method and casing for excavating a borehole |
| 11/02/1994 | EP0621937A1 Removal of contaminants |
| 11/02/1994 | EP0621811A1 Improved method of disposal of contaminated cuttings. |
| 11/01/1994 | US5360738 Infrared spectroscopoy |
| 10/27/1994 | WO1994024405A1 Down-hole hammer drill having reverse circulation and drill bit for the hammer drill |
| 10/27/1994 | WO1994024224A1 Removing fines from a spent aqueous well treating fluid |
| 10/27/1994 | WO1994023849A1 Screen for separating solids from drilling fluid |
| 10/27/1994 | CA2160151A1 Down-hole hammer drill having reverse circulation and drill bit for the hammer drill |
| 10/26/1994 | EP0621397A1 Method of and apparatus for detecting an influx into a well while drilling |
| 10/26/1994 | EP0621329A1 Removing fines from a spent aqueous drilling fluid |
| 10/26/1994 | EP0620892A1 Case cementing method and system |
| 10/18/1994 | US5355967 For drilling an underground wellbore from a surface location |
| 10/18/1994 | CA2016417C Lost circulation fluid for oil field drilling operations |
| 10/14/1994 | WO1993020322A1 Liquid-driven downhole hammer drill |
| 10/14/1994 | CA2133425A1 Liquid-driven downhole hammer drill |
| 10/13/1994 | WO1994023180A1 Method and apparatus for determining depth of drill cuttings |
| 10/13/1994 | WO1994023175A1 Drilling column with sledgehammer drilling head |
| 10/13/1994 | WO1994023172A1 Rotary percussive core drill bit |
| 10/13/1994 | CA2159903A1 Rotary percussive core drill bit |
| 10/13/1994 | CA2136974A1 Method and apparatus for determining depth of drill cuttings |