| 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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| 08/08/2002 | WO2002061236A1 Downhole circulation valve operated by dropping balls |
| 08/08/2002 | WO2001086112A3 Mud bucket seal attachment |
| 08/08/2002 | US20020104806 Apparatus and method for recycling drilling slurry |
| 08/07/2002 | EP1228290A1 Drilling formation tester, apparatus and methods of testing and monitoring status of tester |
| 08/07/2002 | EP0760942B1 Apparatus for testing a shear thickening plugging fluid |
| 08/06/2002 | US6429784 Casing mounted sensors, actuators and generators |
| 08/06/2002 | US6427785 Subsurface measurement apparatus, system, and process for improved well drilling, control, and production |
| 08/06/2002 | US6427782 Noise suppression drilling system |
| 08/06/2002 | CA2060736C Method for determining fluid influx or loss in drilling from floating rigs |
| 08/01/2002 | WO2002004090A3 Continuous flow liquids/solids slurry cleaning, recycling and mixing system |
| 07/31/2002 | EP1227215A2 Method and system for controlling well bore pressure |
| 07/31/2002 | EP1226336A1 Drilling formation tester, apparatus and methods of testing and monitoring status of tester |
| 07/30/2002 | US6427125 Hydraulic calibration of equivalent density |
| 07/25/2002 | US20020096334 Mudsaver valve |
| 07/25/2002 | US20020096321 Method of determining the thermal profile of a drilling fluid in a well |
| 07/24/2002 | EP0904162B1 Continuous belt drilling mud separation system |
| 07/23/2002 | US6422326 Aphron-containing well drilling and servicing fluids of enhanced stability |
| 07/23/2002 | US6422324 Method and device for driving bore-holes, in the sea bed using a counterflush method |
| 07/23/2002 | CA2265273C Water-based drilling fluid deacidification process and apparatus |
| 07/18/2002 | WO2002055839A1 The method for filtrating drilling fluid in rotary way and devices used in the method |
| 07/18/2002 | WO2002055837A1 Pressure pulsing apparatus at surface and method for drilling |
| 07/18/2002 | US20020093875 Fluid mixing system |
| 07/18/2002 | US20020092681 Shale hydration inhibition agent and method of use |
| 07/18/2002 | US20020092655 Subsea wellbore drilling system for reducing bottom hole pressure |
| 07/17/2002 | EP1223303A1 Treatment fluid injection apparatus and method |
| 07/17/2002 | EP1060323B1 Mud circulation for lithosphere drilling |
| 07/17/2002 | EP0760896B1 A well entry tool |
| 07/17/2002 | CN2500799Y Vehicle machine for repairing and washing well |
| 07/17/2002 | CN2500796Y Oil field well-repairing rotating device |
| 07/11/2002 | DE10100471A1 Compressed air drilling machine used for producing bore holes in the ground has end-side nozzles arranged at the end of an inner and outer drill string and sleeve-side nozzles arranged on the channels of the outer drill string |
| 07/10/2002 | EP1220972A1 Underbalanced perforation |
| 07/09/2002 | US6415877 Subsea wellbore drilling system for reducing bottom hole pressure |
| 07/09/2002 | US6415862 Tubular filling system |
| 07/09/2002 | CA2331021A1 Method and apparatus for generating acoustic pulses on the surface and conveying these pulses through the drill string to the drill bit to increase rate of drilling |
| 07/09/2002 | CA2031357C Method of analysing and controlling a fluid influx during the drilling of a borehole |
| 07/04/2002 | US20020084069 Method and multi-purpose apparatus for dispensing and circulating fluid in wellbore casing |
| 07/03/2002 | CN2498321Y Centrifugal vacuum gas remover |
| 07/03/2002 | CN1357076A 钻井系统 Drilling System |
| 07/03/2002 | CN1356451A Reverse cycle drilling method and equipment for oil well or gas well |
| 07/03/2002 | CN1356450A Drilling apparatus for drilling well in stratum |
| 07/02/2002 | US6413297 Primary and secondary separators with gas flow monitoring; reduced erosion of component parts; enhanced recovery of separated gas; compact; land and offshore operations |
| 07/02/2002 | US6412644 Vibratory separator |
| 07/02/2002 | US6412576 Methods and apparatus for subterranean drilling utilizing a top drive |
| 07/02/2002 | US6412574 Method of forming a subsea borehole from a drilling vessel in a body of water of known depth |
| 07/02/2002 | US6412554 Wellbore circulation system |
| 06/27/2002 | WO2002050398A1 Cloded loop fluid-handing system for well drilling |
| 06/27/2002 | US20020079998 Contacting liquid with matrix carrying ligands comprising a positively charged structure and hydrophobic structure, desorbing substance |
| 06/27/2002 | US20020079251 Vibratory separators and screens |
| 06/26/2002 | EP1217166A1 Method and apparatus for drilling and completing a well |
| 06/26/2002 | EP1101013A4 Reverse circulation drilling system with bit locked underreamer arms |
| 06/25/2002 | US6410862 Device and method for measuring the flow rate of drill cuttings |
| 06/25/2002 | US6410085 Method of machining of polycrystalline diamond |
| 06/25/2002 | US6408957 Sealed bearing roller cone bit having anti-plugging device |
| 06/25/2002 | US6408948 Tubing handling for subsea oilfield tubing operations |
| 06/20/2002 | WO2002048063A2 Process for the separation of hollow glass microspheres from muds containing them |
| 06/20/2002 | US20020074269 Method and system for the treatment of drilling mud |
| 06/20/2002 | US20020074168 Polycrystalline diamond cutters with working surfaces having varied wear resistance while maintaining impact strength |
| 06/20/2002 | US20020074166 Method and apparatus for drilling and completing a well |
| 06/20/2002 | US20020074128 Method and apparatus for surge reduction |
| 06/20/2002 | US20020074123 Riser isolation tool |
| 06/19/2002 | EP1214497A1 Absorbent materials and production thereof |
| 06/19/2002 | EP1214496A1 Electrical surface activated downhole circulating sub |
| 06/19/2002 | CN1354693A Recovery apparatus for drilling and excavation applications and related methods |
| 06/18/2002 | US6406255 Apparatus and method for handling waste C-I-P II |
| 06/18/2002 | US6405812 Drilling tool for the air-lifting process |
| 06/13/2002 | WO2002046571A1 Wellbore fluid recovery system & method |
| 06/13/2002 | WO2002046565A2 Speed governor |
| 06/13/2002 | WO2002046564A2 Boring apparatus |
| 06/13/2002 | WO2001048351A3 Subsea well intervention vessel |
| 06/13/2002 | US20020070029 Wellbore fluid recovery system and method |
| 06/13/2002 | US20020070027 Method and apparatus for controlling well pressure in open-ended casing |
| 06/13/2002 | DE10146025A1 Pneumatische Felsbohrvorrichtung Pneumatic Felsbohrvorrichtung |
| 06/12/2002 | CN2494872Y Soft contact valve body of mud pump |
| 06/12/2002 | CN1353792A Method of creating well bore |
| 06/11/2002 | US6401935 Shale shaker screen retainer |
| 06/11/2002 | US6401934 Ramped screen & vibratory separator system |
| 06/11/2002 | US6401838 Method for detecting stuck pipe or poor hole cleaning |
| 06/11/2002 | US6401826 Lubricator for underbalanced drilling |
| 06/11/2002 | US6401823 Deepwater drill string shut-off |
| 06/11/2002 | US6401822 Float valve assembly for downhole tubulars |
| 06/06/2002 | WO2002044517A1 Fluid mixing system |
| 06/06/2002 | WO2002044515A1 Apparatus and method for transferring dry oil and gas well drill cuttings |
| 06/06/2002 | WO2002044511A1 Pneumatic rock-boring device and method for starting such a device |
| 06/06/2002 | WO2002044508A2 Pneumatic rock-boring device and method for horizontal drilling using compressed air and drilling medium |
| 06/06/2002 | US20020066695 Slurry treatment |
| 06/06/2002 | US20020066597 Dynamic shut-in of a subsea mudlift drilling system |
| 06/06/2002 | US20020066596 Subsea mud pump and control system |
| 06/06/2002 | US20020066571 Controlling a well in a subsea mudlift drilling system |
| 06/06/2002 | US20020066569 Method for detecting a leak in a drill string valve |
| 06/06/2002 | US20020066564 Method and multi-purpose apparatus for dispensing and circulating fluid in wellbore casing |
| 06/06/2002 | US20020066558 Tubular filling system |
| 06/05/2002 | EP1210499A1 Method and system for processing of drilling fluid |
| 06/05/2002 | EP1210166A1 A screen assembly for a vibratory shaker |
| 06/04/2002 | US6397946 Closed-loop system to compete oil and gas wells closed-loop system to complete oil and gas wells c |
| 05/30/2002 | WO2002042647A2 Hydraulic drill string accumulator |
| 05/29/2002 | EP1208285A1 Method and apparatus for displacing drilling fluids with completion and workover fluids, and for cleaning tubular members |
| 05/29/2002 | EP1208284A1 Sliding sleeve assembly for subsurface flow control |
| 05/29/2002 | EP1208282A1 Method for injecting dense additive into drilling wells and composition therefore |
| 05/29/2002 | CN2493738Y Concentric pipe type foam generator |
| 05/28/2002 | US6394197 Reverse circulation drilling system with bit locked underreamer arms |