| Patents for E21B 21 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (13,780) |
|---|
| 05/28/2002 | US6394195 Methods for the dynamic shut-in of a subsea mudlift drilling system |
| 05/28/2002 | US6394194 Method and apparatus for a drill cutting injection system |
| 05/28/2002 | CA2326967A1 Circulating apparatus for an oil production tubing string having an inline pump |
| 05/23/2002 | WO2002040186A1 A shale shaker |
| 05/21/2002 | US6391094 Method and apparatus for removing gas from drilling mud |
| 05/21/2002 | US6390208 Aphron-containing well drilling and servicing fluids |
| 05/21/2002 | US6390200 Drop ball sub and system of use |
| 05/21/2002 | US6390190 Tubular filling system |
| 05/21/2002 | US6389878 Gas trap for drilling mud |
| 05/16/2002 | WO2002014650A8 Activating ball assembly for use with a by-pass tool in a drill string |
| 05/15/2002 | EP1205631A1 Method for determining the thermal profile of drilling fluid |
| 05/15/2002 | EP1205628A1 A grease tube |
| 05/15/2002 | CN1349585A 磨料射流钻孔组装件 Abrasive jet drilling assembly |
| 05/15/2002 | CN1349036A Rotary operation equipment for light overhaul of oil-water well and its circulation system |
| 05/15/2002 | CN1348855A Hole-drilling dust collector for air conditioner installation |
| 05/14/2002 | US6386026 Cuttings sample catcher and method of use |
| 05/10/2002 | WO2002036929A1 Apparatus and method for preparing variable density drilling muds |
| 05/10/2002 | WO2002036928A1 Continuous circulation drilling method |
| 05/10/2002 | WO2002036237A1 A screen assembly for a vibratory separator |
| 05/10/2002 | CA2427204A1 Continuous circulation drilling method |
| 05/09/2002 | US20020055438 Non ecotoxic and optimally compatible with formation fluids, comprises at least one anionic surfactant wetting agent and one demulsifier |
| 05/09/2002 | US20020053427 Tubular filling system |
| 05/08/2002 | CN2490310Y Rock salt gas storage storehouse cavity forming apparatus |
| 05/08/2002 | CN1348052A Mud level displaying alarm and well mud level monitoring method |
| 05/07/2002 | US6382423 Selective reduction of naturally occurring radioactive material to be treated, and its treatment |
| 05/07/2002 | US6381899 Well drill cuttings disposal |
| 05/02/2002 | WO2002035053A1 Rock drilling apparatus and mechanical conveyor for drill cuttings |
| 05/02/2002 | WO2002035052A1 Rock drilling apparatus |
| 05/02/2002 | WO2002034653A1 Device for transporting particles of magnetic material |
| 05/02/2002 | WO2002034358A2 A screen for a shale shaker |
| 05/02/2002 | CA2426056A1 Rock drilling apparatus and mechanical conveyor for drill cuttings |
| 05/02/2002 | CA2426051A1 Rock drilling apparatus |
| 04/30/2002 | US6378628 Monitoring system for drilling operations |
| 04/30/2002 | US6378612 Pressure actuated downhole tool |
| 04/25/2002 | WO2002033217A1 Device for performing hydrodynamic action on wellbore walls |
| 04/25/2002 | WO2002033215A2 Dual valve well control in underbalanced wells |
| 04/25/2002 | WO2002033212A1 Cement shoe assembly for monobore well |
| 04/25/2002 | CA2756623A1 Cement shoe assembly for monobore well |
| 04/23/2002 | US6374925 Well drilling method and system |
| 04/23/2002 | CA2258365C Apparatus and process for cleaning clearwater drilling muds |
| 04/22/2002 | WO2001057353A3 Hard rock drilling device and method |
| 04/18/2002 | US20020045059 High volume density polycrystalline diamond with working surfaces depleted of catalyzing material |
| 04/18/2002 | US20020043485 Unibody structure for screen assembly |
| 04/16/2002 | US6371302 Vibratory separator screens |
| 04/16/2002 | US6371301 Screen basket for shale shakers |
| 04/16/2002 | US6371207 Method and apparatus for displacing drilling fluids with completion and workover fluids, and for cleaning tubular members |
| 04/16/2002 | US6371204 Underground well kick detector |
| 04/11/2002 | WO2002029200A1 Downhole valve device |
| 04/11/2002 | US20020040812 Methods for reducing lost circulation in wellbores |
| 04/10/2002 | EP1000220B1 Bypass valve closing means |
| 04/10/2002 | CN1082602C Well tool and method of performing well operation |
| 04/10/2002 | CN1082601C Logging tool deployment appts. |
| 04/09/2002 | US6367566 Down hole, hydrodynamic well control, blowout prevention |
| 04/09/2002 | US6367565 Means for detecting subterranean formations and monitoring the operation of a down-hole fluid driven percussive piston |
| 04/09/2002 | US6367323 Dynamic pressure device for oil drill systems |
| 04/02/2002 | US6365053 Removal of H2S in drilling mud |
| 04/02/2002 | CA2298912C Method and apparatus for drying particulates |
| 03/28/2002 | WO2002025052A1 Well drilling method and system |
| 03/28/2002 | WO2001076719A3 A screen assembly, a support structure, a method of making same and a vibratory shaker |
| 03/28/2002 | US20020036101 Arrangement in rock drilling apparatus |
| 03/27/2002 | EP1190754A1 Demulsifying formulation based on oil and use thereof for the treatment of oil drill drains containing oil slurry |
| 03/27/2002 | EP1190156A2 Downhole apparatus |
| 03/27/2002 | EP0830327B1 Stable suspension of hydrocolloids |
| 03/27/2002 | CN2483502Y Mud purification apparatus |
| 03/26/2002 | CA2212840C Sand exclusion liner for use in a wellbore |
| 03/26/2002 | CA2047555C Process and drilling equipment for sinking a well in underground rock formations |
| 03/21/2002 | US20020034632 Polycrystalline diamond partially depleted of catalyzing material |
| 03/21/2002 | US20020034631 High volume density polycrystalline diamond with working surfaces depleted of catalyzing material |
| 03/21/2002 | US20020033383 Machining of polycrystalline diamond |
| 03/21/2002 | US20020033282 Rotary drill bit |
| 03/21/2002 | US20020033278 Cuttings injection system and method |
| 03/21/2002 | US20020033258 Methods of using reversible phase oil based drilling fluid |
| 03/21/2002 | US20020033077 Rotary drill bit design method |
| 03/20/2002 | EP1187966A1 Controlling pressure and detecting control problems in gas-lift riser during offshore well drilling |
| 03/20/2002 | CN1081282C Extension drlling system and lengthening drilling rod |
| 03/19/2002 | US6357536 Method and apparatus for measuring fluid density and determining hole cleaning problems |
| 03/14/2002 | WO2002020942A1 Hydraulic control system for downhole tools |
| 03/14/2002 | WO2002020691A2 Use of water soluble demulsifiers in separating hydrocarbon oils from clays |
| 03/14/2002 | US20020029886 Wellbore flow control device |
| 03/14/2002 | US20020029879 Method and multi-purpose apparatus for dispensing and circulating fluid in wellbore casing |
| 03/14/2002 | CA2419953A1 Use of water soluble demulsifiers in separating hydrocarbon oils from clays |
| 03/13/2002 | EP1042585B1 Method and apparatus for cementing casing in a wellbore |
| 03/13/2002 | EP0909362B1 Boring tool for reverse circulation |
| 03/13/2002 | CN2482063Y Intelligent flow metering and adjusting apparatus for oil field separated layer water injection |
| 03/13/2002 | CN2481842Y Drilling fluid cleaning device |
| 03/13/2002 | CN1340128A Hydraulic underreamer and sections for use therein |
| 03/12/2002 | US6354378 Method and apparatus for formation isolation in a well |
| 03/12/2002 | CA2032747C Method of in-situ testing of a drilling fluid |
| 03/07/2002 | WO2001069034A3 Wellbore circulation system, kelly bushing, kelly and tong |
| 03/07/2002 | US20020027002 Downhole flow control devices |
| 03/06/2002 | EP1184536A2 Method and apparatus for installing casing in a well |
| 03/06/2002 | EP1183478A1 Fluid flow and pressure control system and method |
| 03/06/2002 | CN2480827Y Theft-proof pressure-measuring oil sampling device for oil-production hole top |
| 03/05/2002 | US6352129 Drilling system |
| 03/05/2002 | US6352114 Deep ocean riser positioning system and method of running casing |
| 02/28/2002 | WO2001079648A3 Methods of drilling a bore hole and dehydrating drilling fluids |
| 02/28/2002 | WO2000075477A8 Controlling pressure and detecting control problems in gas-lift riser during offshore well drilling |
| 02/28/2002 | US20020023781 Method and apparatus for lateral well drilling utilizing a rotating nozzle |
| 02/28/2002 | US20020023748 Method and apparatus for washing subsea drilling rig equipment and retrieving wear bushings |
| 02/28/2002 | US20020023746 Methods of downhole testing subterranean formations and associated apparatus therefor |