E21B 21 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor

Patents for E21B 21 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (13,780)
10/2007
10/18/2007	US20070242565 Downhole Pressure Pulse Activated by Jack Element
10/18/2007	US20070240875 Choke for controlling the flow of drilling mud
10/17/2007	EP1592863B1 Improved downhole apparatus
10/17/2007	CN101054891A Movable type well-flushing truck pipe controller
10/17/2007	CN100343477C Fast valve actuator and tool provided with same
10/17/2007	CN100343475C Dynamic annular pressure control apparatus and method
10/17/2007	CN100343474C Washpipe assembly
10/16/2007	US7281593 Method for the circulation of gas when drilling or working a well
10/16/2007	US7281592 Injecting a fluid into a borehole ahead of the bit
10/16/2007	US7281584 Multi-cycle downhill apparatus
10/16/2007	US7281576 Apparatus and methods for sealing voids in a subterranean formation
10/11/2007	US20070235336 Electrical Treatment for Oil Based Drilling or Completion Fluids
10/11/2007	DE19906687B4 Doppelkopfbohrvorrichtung kurzer Bauart Doppelkopfbohrvorrichtung short length
10/10/2007	EP1841946A1 Method and system for cleaning a well bore
10/10/2007	CN200958377Y Submersible reversed-circulating well rig
10/10/2007	CN101050695A System for recovering barite and clearing useless solid phase from weighted drilling fluid
10/10/2007	CN100341976C Shale hydration inhibition agent and method of use
10/10/2007	CN100341971C Water block removal with surfactant based hydrocarbonaceous liquid system
10/09/2007	US7279445 Membrane forming in-situ polymerization for water based drilling fluids
10/09/2007	US7278497 Method for extracting coal bed methane with source fluid injection
10/09/2007	US7278496 Drilling system and method
10/09/2007	US7278488 Method of generating stable foam for oil and gas well cleanouts
10/09/2007	US7278487 Methods of using chemical wash compositions for removing drilling fluids
10/09/2007	CA2361042C Slurry treatment
10/09/2007	CA2267426C Continuous circulation drilling method
10/04/2007	WO2007112292A2 Method for controlling fluid pressure in a borehole using a dynamic annular pressure control system
10/04/2007	US20070227774 Method for Controlling Fluid Pressure in a Borehole Using a Dynamic Annular Pressure Control System
10/03/2007	EP1532347B1 Closed loop multiphase underbalanced drilling process
10/02/2007	US7275606 Solids strainer system for a hydraulic choke
10/02/2007	US7275605 Rotatable drill shoe
09/2007
09/27/2007	WO2007108703A1 Wellbore tool for filling, circulating and backflowing fluids
09/27/2007	WO2007108692A1 Washing tool and method for cleaning wells and onshore/offshore boring equipment
09/27/2007	WO2007107950A1 Methods of treating wellbores with recyclable fluids
09/27/2007	US20070225175 Such as polylactic or polyhydroxyalkanoate to viscosify aqueous fluids; sand control screens or liners
09/27/2007	US20070221414 Releasable mill
09/27/2007	US20070221413 Flow system for a hydraulic choke solids Strainer
09/27/2007	US20070221411 Recovery system
09/27/2007	US20070221410 Recovery system
09/27/2007	US20070221407 Permanent downhole deployment of optical sensors
09/26/2007	EP1687505B1 Fluid jet drilling tool
09/26/2007	CN200952382Y Top pulling flexible resetting self-cementing floating hoop
09/26/2007	CN200952368Y Water injection well stainless steel seepage type removable stain and pollutant removing back flushing fine filter
09/26/2007	CN200952367Y Underwell continuous sand flushing tubular column
09/26/2007	CN200952366Y Rotary flow guiding device
09/26/2007	CN200952363Y Hydraulic clamp for gas drainage drilling machine
09/26/2007	CN200952347Y Chuck and water swivel integrated device for gas drainage full hydraulic drilling machine
09/25/2007	CA2464675C Apparatus and method for separating hydrocarbons from material
09/20/2007	US20070215388 Downhole Apparatus for Mobilising Drill Cuttings
09/20/2007	US20070215387 Solids strainer system for a hydraulic choke
09/20/2007	US20070215386 Drill cuttings conveyance systems and methods
09/20/2007	US20070215218 Device for Removal and Filtration of Drilling Fluid
09/19/2007	CN200949431Y Slurry purification system there pumps parallel arrangement
09/19/2007	CN100338331C Two string drilling system
09/18/2007	US7271134 Subterranean treatment fluid containing a friction reducing polymer, particularly hydrolyzed polyacrylamide; an anionic salt; a polyol such as glycerine; a nonionic surfactant (e.g., polyester polyol); and an anionic surfactant such as polyammonium acrylate; for stimulation of oil wells
09/18/2007	US7270185 Drilling system and method for controlling equivalent circulating density during drilling of wellbores
09/18/2007	US7270181 Downhole surge pressure reduction and filtering apparatus
09/18/2007	CA2468899C Flow actuated valve for use in a wellbore
09/18/2007	CA2453648C Methods of drilling and completing well bores
09/18/2007	CA2406842C Annular pressure spool
09/13/2007	WO2007102743A1 A treatment method for drill cuttings from petroleum wells
09/13/2007	CA2643690A1 Method and apparatus for managing variable density drilling mud
09/12/2007	EP1831501A1 Enhanced slurrification method
09/12/2007	EP1618258B1 Method for pneumatically picking up soil for use in suction devices and suction tube for this purpose and use of said suction tube
09/12/2007	EP1438482B1 Cementing system for wellbores
09/12/2007	CN200946556Y Foam compression pump
09/12/2007	CN200946513Y Wet type drilling water-injector for mining
09/12/2007	CN200946484Y Upper-pull type rigid reset self-grouting floating hoop
09/12/2007	CN101035961A Sleeve arrangement
09/11/2007	US7267177 Tubing fill and testing valve
09/11/2007	US7266983 Methods to detect formation pressure
09/11/2007	CA2426258C An apparatus for retrieving metal debris from a well bore
09/07/2007	CA2755939A1 Aerated degasser
09/06/2007	US20070205000 Instrumentation for a downhole deployment valve
09/06/2007	US20070204993 Method for drilling and casing a wellbore with a pump down cement float
09/05/2007	EP1588020B1 Apparatus for the cooling of drilling liquids
09/05/2007	EP1402147B1 Multi-cycle downhole apparatus
09/05/2007	CN200943456Y Highly effective gas cut drilling fluid vacuum degasifier
09/05/2007	CN100335741C Assembly and method for drilling low pressure formation
09/04/2007	US7264058 Arrangement and method for regulating bottom hole pressures when drilling deepwater offshore wells
09/04/2007	CA2486673C Dynamic mudcap drilling and well control system
09/04/2007	CA2447770C Shale hydration inhibition agent and method of use
09/02/2007	CA2756093A1 Rotating control head radial seal protection and leak detection systems
09/02/2007	CA2756090A1 Rotating control head radial seal protection and leak detection systems
08/2007
08/30/2007	WO2007096660A1 Method and apparatus for centralized proppant storage and metering
08/30/2007	WO2007057426A3 Device and method for feeding particles into a stream
08/30/2007	US20070199714 Closed loop multiphase underbalanced drilling process
08/30/2007	US20070199703 Aerated degasser
08/29/2007	EP1554461B1 Cement flow control tool
08/29/2007	CN200940456Y Spiral flow sand washing device for horizontal well
08/29/2007	CN200940447Y Drill bit water hole clamp with filter net
08/28/2007	US7261164 Floatable drill cuttings bag and method and system for use in cuttings disposal
08/23/2007	US20070193738 Treatment of cesium-containing fluids
08/22/2007	EP1819429A1 Dry polymer hydration apparatus and methods of use
08/22/2007	EP1592862B1 Rock drill machine and flushing housing
08/22/2007	CN2937477Y Side water feeder of electric coal drill
08/22/2007	CN2937452Y Quick sand flushing device
08/22/2007	CN2937451Y Flushing machine
08/22/2007	CN101023241A Method of drilling a lossy formation
08/21/2007	US7258171 Internal riser rotating control head
08/21/2007	US7258163 Method and system for production of gas and water from a coal seam using well bores with multiple branches during drilling and after drilling completion

1 ... 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 ... 138