| 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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| 10/10/2002 | DE10133181A1 Mischvorrichtung für Bohrmedien Mixing device for Bohrmedien |
| 10/09/2002 | EP1247787A1 Rotary seal for directional drilling tools |
| 10/09/2002 | EP1246681A1 A method of making a screen, a screen, and a system for making a screen |
| 10/09/2002 | EP1159557A4 Swivel seal assembly |
| 10/09/2002 | EP1127477A4 Method and device in down-the-hole drilling |
| 10/09/2002 | CN2515420Y Packer |
| 10/08/2002 | US6462096 Organophilic clay additives and oil well drilling fluids with less temperature dependent rheological properties containing said additives |
| 10/08/2002 | US6460936 Borehole mining tool |
| 10/08/2002 | US6460632 Circulating an aqueous drilling fluid containing a single foaming and defoaming surfactant and a gas downwardly through a rotary drill pipe and drill bit connected thereto. |
| 10/08/2002 | US6460620 Mudsaver valve |
| 10/03/2002 | WO2002077408A1 Boring medium mixing device |
| 10/03/2002 | US20020139724 Screen support and screens for shale shakers |
| 10/03/2002 | US20020139585 Reverse circulation drilling system with bit locked underreamer arms |
| 10/03/2002 | US20020139584 Rotary seal for directional drilling tools |
| 10/02/2002 | CN2514113Y Well washing packer for water injection well |
| 10/02/2002 | CN1091830C Downhole clutch with flow ports |
| 10/02/2002 | CN1091829C Drill shank for drill drive |
| 10/01/2002 | US6457541 Surface controlled by-pass valve |
| 10/01/2002 | US6457540 Method and system for hydraulic friction controlled drilling and completing geopressured wells utilizing concentric drill strings |
| 10/01/2002 | US6457529 Apparatus and method for returning drilling fluid from a subsea wellbore |
| 10/01/2002 | US6457526 Sub sea bottom hole assembly change out system and method |
| 09/26/2002 | WO2002075104A1 Downhole tool |
| 09/26/2002 | WO2002074699A2 Method for regeneration of used halide fluids |
| 09/26/2002 | US20020136904 Frangible rupture disk for use in blocking fluid flow, use such as a well casing, a well tubing string or other conduits within subterranean boreholes; temporary and controllable fluid blockage |
| 09/26/2002 | US20020134587 Method, system and tool for reservoir evaluation and well testing during drilling operations |
| 09/26/2002 | US20020134555 Tong for wellbore operations |
| 09/26/2002 | US20020134550 Slurry recovery process |
| 09/25/2002 | EP1243747A1 Float apparatus for well drilling |
| 09/25/2002 | EP1243746A1 Method and multi-purpose apparatus for dispensing and circulating fluid in wellbore casing |
| 09/25/2002 | EP1242713A1 Controlling the flow of driving fluid to a system of multiple hydraulic motors |
| 09/25/2002 | EP1242712A1 Combined power tong having integrated mud suction and thread doping apparatus |
| 09/25/2002 | EP1021231B1 Improved helical separator |
| 09/25/2002 | CN2512898Y Water injection well washing device in oil field |
| 09/24/2002 | US6454099 Vibrator separator screens |
| 09/24/2002 | US6454022 Riser tube for use in great sea depth and method for drilling at such depths |
| 09/24/2002 | US6454009 Apparatus and method for cleaning well risers |
| 09/24/2002 | US6453738 Method and apparatus for analyzing casing wear and retrieval of metallic fragments |
| 09/24/2002 | US6453584 Continuous vacuum, separator, dispensing system |
| 09/21/2002 | CA2341925A1 Slurry recovery process |
| 09/19/2002 | US20020130090 Adding acid to used halide fluid; contacting used halide fluid with halogen to increase fluid density, adjust crystallization temperature and oxidize impurities; adding reducing agent; neutralizing excess acid; separating solid impurities |
| 09/19/2002 | US20020129944 Drillable floating equipment and method of eliminating bit trips by using drillable materials for the construction of shoe tracks |
| 09/19/2002 | US20020129943 Method for controlling bottom-hole pressure during dual-gradient drilling |
| 09/19/2002 | US20020129942 Tool string |
| 09/19/2002 | US20020129934 Tubular filling system |
| 09/19/2002 | CA2375906A1 Drillable floating equipment and method of eliminating bit trips by using drillable materials for the construction of shoe tracks |
| 09/18/2002 | EP1240404A2 Subsea well intervention vessel |
| 09/18/2002 | EP1239934A1 Device and method for separation of liquid hazardous waste |
| 09/18/2002 | CN2511784Y Blockproof sand washover device |
| 09/17/2002 | US6450345 Glue pattern screens and methods of production |
| 09/17/2002 | US6450262 Riser isolation tool |
| 09/17/2002 | US6450255 Downhole flow control devices |
| 09/17/2002 | CA2214755C Core drilling latch assembly |
| 09/17/2002 | CA2104695C Method for regaining mud circulation in operating well and device for its embodiment |
| 09/12/2002 | WO2002070151A1 Auger cleaning of solids |
| 09/12/2002 | US20020128158 Used to control lost circulation, fluid loss and/or seepage loss of drilling fluid during drilling operations |
| 09/12/2002 | CA2445246A1 Auger cleaning of solids |
| 09/11/2002 | EP1238183A1 A method for a valve, a valve and a wire line core drilling system including said valve |
| 09/11/2002 | EP1238182A1 Flow actuated shut-off valve |
| 09/10/2002 | US6446720 Methods of downhole testing subterranean formations and associated apparatus therefor |
| 09/10/2002 | US6446719 Methods of downhole testing subterranean formations and associated apparatus therefor |
| 09/06/2002 | WO2002068795A1 Liquid lift method for drilling risers |
| 09/06/2002 | WO2002068793A1 Ball activated tool for use in downhole drilling |
| 09/06/2002 | WO2002068787A2 Method and apparatus for controlling bottom-hole pressure during dual-gradient drilling |
| 09/06/2002 | WO2002050398B1 Cloded loop fluid-handing system for well drilling |
| 09/06/2002 | WO2002010546A3 Method and apparatus for formation damage removal |
| 09/06/2002 | WO2001004456A9 Lubricator for underbalanced drilling |
| 09/06/2002 | CA2833423A1 Enzymes having alpha amylase activity and methods of use thereof |
| 09/05/2002 | US20020123431 Providing drilling fluid, drilling fluid additive comprising superparamagnetic nanoparticles; adding additive to fluid; exposing treated drilling fluid to magnetic field so as to recover superparamagnetic nanoparticles |
| 09/05/2002 | US20020121392 Method and apparatus for boring through a solid material |
| 09/04/2002 | EP0946669B1 Multiphase lubricant concentrates for use in water based systems in the field of exploratory soil drilling |
| 09/03/2002 | US6443310 Seal screen structure |
| 09/03/2002 | US6443247 Casing drilling shoe |
| 09/03/2002 | US6443245 Non-cryogenic nitrogen for on-site downhole drilling and post drilling operations |
| 09/03/2002 | US6443001 Method and system for extracting, analyzing and measuring constituents transported by a bore fluid |
| 08/29/2002 | WO2002033215A3 Dual valve well control in underbalanced wells |
| 08/29/2002 | WO2000014378A9 Gas impulse device and method of use thereof |
| 08/29/2002 | US20020117332 Liquid lift method for drilling risers |
| 08/29/2002 | US20020117309 Hydraulically activated selective circulating/reverse circulating packer assembly |
| 08/28/2002 | EP1183478A4 Fluid flow and pressure control system and method |
| 08/28/2002 | EP0778914B1 Drill casing installation equipment with external friction reducing means |
| 08/27/2002 | US6440312 Oil apparatus having electroconductive walls and heaters including radiators for applying radio frequency to heat the residues; vaporization; water treatment |
| 08/27/2002 | CA2270856C Flow restrictor valve for a downhole drilling assembly |
| 08/22/2002 | WO2002064942A2 Downhole packer |
| 08/22/2002 | WO2002064699A2 Oleaginous drilling fluid, method of use and bio-remediation of the same to produce a useful soil amendments |
| 08/22/2002 | WO2002064233A1 Cleaning of hydrocarbon-containing materials with critical and supercritical solvents |
| 08/22/2002 | US20020112888 Drilling system and method |
| 08/21/2002 | EP1233143A1 Coiled tubing |
| 08/21/2002 | CN1364973A Hydraulic wet drill |
| 08/20/2002 | US6435058 Rotary drill bit design method |
| 08/15/2002 | WO2002063295A1 Sampling of hydrocarbons from geological formations |
| 08/15/2002 | WO2002062920A1 Invert emulsion drilling fluids and muds having negative alkalinity and elastomer compatibility |
| 08/15/2002 | WO2002020691A3 Use of water soluble demulsifiers in separating hydrocarbon oils from clays |
| 08/15/2002 | US20020108786 Apparatus and method for preparing variable density drilling muds |
| 08/15/2002 | US20020108783 Well drilling method and system |
| 08/15/2002 | US20020108782 Method and apparatus for varying the density of drilling fluids in deep water oil drilling applications |
| 08/15/2002 | CA2432520A1 Invert emulsion drilling fluids and muds having negative alkalinity and elastomer compatibility |
| 08/14/2002 | CN2505583Y Water tube elbow of rock drill |
| 08/14/2002 | CN1364224A Fluid flow and pressure control system and method |
| 08/14/2002 | CN1364211A Method for injecting dense additive into drilling wells and composition therefor |
| 08/13/2002 | US6431294 Percussive tool |