| 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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| 03/26/2008 | CN101151082A Vibratory separator and method for separating solids from a solids laden drilling fluid |
| 03/25/2008 | US7347289 Dart-operated big bore by-pass valve |
| 03/25/2008 | US7347288 Ball operated by-pass tool for use in drillstring |
| 03/25/2008 | US7347286 Drill string valve assembly |
| 03/25/2008 | CA2492402C Indexing apparatus |
| 03/25/2008 | CA2485875C Settling tank and method for separating a solids containing fluid |
| 03/25/2008 | CA2385426C Method and device for moving a tube in a borehole in the ground |
| 03/20/2008 | WO2008010174A3 Dust particle catcher for a drilling apparatus |
| 03/20/2008 | WO2007134059B1 Downhole swivel apparatus and method |
| 03/20/2008 | US20080066903 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 03/19/2008 | EP1900412A2 Apparatus and method for screening drilling mud |
| 03/19/2008 | EP1448320B1 Apparatus and method for separating hydrocarbons from materials |
| 03/19/2008 | EP1282757B1 Subsea riser disconnect and method |
| 03/19/2008 | EP0927295B1 Wellbore milling system |
| 03/19/2008 | CN201037384Y High pressure water injection well closure well-washing device |
| 03/19/2008 | CN101144375A Horizontal well continuous sand flushing device |
| 03/18/2008 | US7343986 comprising a lubricating agent of hydrocarbyl polyether phosphate; modified polyoxyethylene glycol or ethylene oxide-propylene oxide copolymers; oil and/or gas wells; lubricant compatibility and performance matching with a drilling fluid which has a brine phase |
| 03/18/2008 | US7343983 Method and apparatus for isolating and testing zones during reverse circulation drilling |
| 03/18/2008 | US7343974 Method and apparatus for performing chemical treatments of exposed geological formations |
| 03/18/2008 | CA2295008C Improvements in and relating to screens for shale shakers |
| 03/14/2008 | CA2602883A1 Methods of forming and using an in situ heavy hydrocarbon emulsion |
| 03/13/2008 | WO2008028907A1 Drilling method, and drilling device |
| 03/13/2008 | US20080061003 Apparatus for recycling of oil based drilling fluid contaminated with water and water contaminated with oil based drilling fluid |
| 03/13/2008 | US20080060846 Annulus pressure control drilling systems and methods |
| 03/13/2008 | US20080060816 Wellhead seal unit |
| 03/13/2008 | US20080060815 Wellhead seal unit |
| 03/13/2008 | US20080060807 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 03/13/2008 | US20080060806 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 03/13/2008 | US20080060805 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 03/13/2008 | US20080060804 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 03/13/2008 | US20080060799 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 03/13/2008 | US20080060571 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 03/12/2008 | EP1898044A2 Annulus pressure control drilling systems and methods |
| 03/12/2008 | EP1896195A1 Apparatus for sieving and fluid separation and a method of using same |
| 03/12/2008 | CN201034018Y Reverse-circulation well borer faucet backing and returning device |
| 03/12/2008 | CN101139925A Method for while-drilling testing reservoir parameter property and adjusting well drilling action in real time |
| 03/12/2008 | CN101139914A Submerged reverse-circulation well-digging machine |
| 03/12/2008 | CN101139911A Gas injection pressure-stabilizing drilling method |
| 03/11/2008 | US7341980 Injecting fluid viscosifled with a betaine zwitterionic viscoelastic surfactant and a rheology enhancer into oil well, viscosity recovery time at relatively low shear conditions following a reduced viscosity from high shear |
| 03/11/2008 | CA2436054C Selective direct and reverse circulation check valve mechanism for coiled tubing |
| 03/11/2008 | CA2231734C Improved oil-based drilling fluid |
| 03/07/2008 | CA2600602A1 Annulus pressure control drilling systems and methods |
| 03/06/2008 | WO2008025936A1 A pressure relief valve and a method for relieving pressure from a system comprising a mud pump |
| 03/06/2008 | WO2008005289A3 Method for improved well control with a downhole device |
| 03/06/2008 | WO2007122520A3 Improvements to a transportable hydrocarbon-recovery unit |
| 03/06/2008 | US20080059073 Methods and apparatus for handling and drilling with tubulars or casing |
| 03/06/2008 | DE102006042046A1 Bohrverfahren und Bohrvorrichtung Drilling methods and drilling device |
| 03/05/2008 | CN201031642Y Transmission structure of hydraulic motor driven drill pump |
| 03/05/2008 | CN201031641Y Well washing device special for water injection well |
| 03/05/2008 | CN101135235A Two-tube reverse circulation continuous sand flushing device |
| 03/04/2008 | US7338608 Solid-liquid separation of oil-based muds |
| 03/04/2008 | US7337860 Apparatus and process for removing liquids from drill cuttings |
| 03/04/2008 | US7337847 Multi-cycle downhole apparatus |
| 02/28/2008 | US20080047749 Methods and apparatus for applying torque and rotation to connections |
| 02/27/2008 | EP1891297A2 Novel activating mechanism for controlling the operation of a downhole tool |
| 02/27/2008 | CN201027507Y Wet-type drilling can filler of electric coal drill |
| 02/27/2008 | CN100371689C X-ray monitoring |
| 02/26/2008 | US7334651 Kick warning system using high frequency fluid mode in a borehole |
| 02/26/2008 | US7334650 Apparatus and methods for drilling a wellbore using casing |
| 02/26/2008 | CA2376211C Drilling formation tester, apparatus and methods of testing and monitoring status of tester |
| 02/21/2008 | WO2008022141A1 A fluid loss control system and method for controlling fluid loss |
| 02/21/2008 | WO2008005714A3 Downhole abrading tools having a hydrostatic chamber and uses therfor |
| 02/21/2008 | WO2007145735A3 Method for fabricating compressible objects for a variable density drilling mud |
| 02/21/2008 | WO2007124097A3 Drill string flow control valves and methods |
| 02/21/2008 | WO2007102971A3 Method and apparatus for managing variable density drilling mud |
| 02/21/2008 | WO2007021422A3 Triple valve blow out preventer |
| 02/21/2008 | US20080041631 Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells |
| 02/21/2008 | US20080041149 Drilling system and method |
| 02/21/2008 | CA2658791A1 Core annular flow of heavy crude oils in transportation pipelines and production wellbores |
| 02/20/2008 | EP1888871A1 Casing and drill pipe filling and circulation apparatus |
| 02/20/2008 | CN201024991Y Under-well bushing exhaust valve |
| 02/20/2008 | CN201024987Y Separated multi-channel rotary valve |
| 02/20/2008 | CN201024937Y A ventilation interface for tooth wheel driller |
| 02/20/2008 | CN201024936Y A device for removing mud and sand of artesian well liquid |
| 02/20/2008 | CN201024935Y Cleaning device for self-lifting artesian well liquid |
| 02/20/2008 | CN201024934Y Artesian well liquid transport pipe convergence device |
| 02/20/2008 | CN201024933Y A supporter for coat mine well |
| 02/19/2008 | US7332460 alkylxylene moiety in the alkylxylene sulfonate contains a high percentage of the 4-alkyl-1,2-dimethyl benzene isomer and attachment of the alkyl group to the xylene ring at positions higher than the 2-position on the alkyl carbon chain; for enhancing the recovery of oil from a subterranean reservoir |
| 02/19/2008 | US7331391 Well treating method to prevent or cure lost-circulation |
| 02/19/2008 | US7331389 Re-use of recovered treating fluid |
| 02/19/2008 | CA2459723C Active controlled bottomhole pressure system and method |
| 02/19/2008 | CA2333516C Arrangement for the removal of cuttings and gas arising from drilling operations |
| 02/14/2008 | US20080035374 Method of Drilling a Lossy Formation |
| 02/13/2008 | EP1885989A1 Apparatus and method for driving casing or conductor pipe |
| 02/13/2008 | EP1702135B1 A method and device for controlling drilling fluid pressure |
| 02/13/2008 | CN100368655C Automatic mud grouting device for drilling |
| 02/12/2008 | CA2457307C Hybrid coiled tubing/fluid pumping unit |
| 02/12/2008 | CA2376806C Tool string |
| 02/12/2008 | CA2363495C A method and apparatus for drilling off a floating structure |
| 02/12/2008 | CA2363132C Internal riser rotating control head |
| 02/12/2008 | CA2287606C Vacuum tank for use in handling oil and gas well cuttings |
| 02/07/2008 | WO2008016965A1 Cleaning apparatus and method |
| 02/07/2008 | WO2008016961A1 Drilling method and downhole cleaning tool |
| 02/07/2008 | US20080029307 Rock Drilling Equipment |
| 02/07/2008 | US20080029306 Method for Improved Well Control With A Downhole Device |
| 02/07/2008 | US20080029268 Flow Diverter |
| 02/07/2008 | US20080029267 Horizontal oilfield pumping systems |
| 02/06/2008 | CN101120153A Method and system for cleaning a well bore |
| 02/06/2008 | CN100366861C Earthquake dry well drill |
| 02/05/2008 | US7325629 Method and system for processing oil and gas well cuttings utilizing existing slurry processing equipment |