| 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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| 12/22/2005 | US20050279506 Flow-biased sequencing valve |
| 12/22/2005 | US20050279492 Wellbore top drive systems |
| 12/22/2005 | CA2568593A1 Method and apparatus for performing chemical treatments of exposed geological formations |
| 12/20/2005 | US6977048 Method of recycling water contaminated oil based drilling fluid |
| 12/20/2005 | US6976819 Tank having multiple screw-type transfer augers |
| 12/20/2005 | US6976546 Drilling mud filtration device |
| 12/15/2005 | WO2005119002A1 Continuous positive flow backflash prevention system |
| 12/15/2005 | WO2005119001A1 Separation of evolved gases from drilling fluids in a drilling operation |
| 12/15/2005 | WO2005119000A1 High-velocity discharge equalizing system and method |
| 12/15/2005 | WO2005118741A2 Surge device for air drilling |
| 12/15/2005 | US20050274677 Methods for treating heavy halide brines with permanganates |
| 12/15/2005 | US20050274545 Pressure Relief nozzle |
| 12/15/2005 | US20050274525 Floating plate back pressure valve assembly |
| 12/15/2005 | US20050274515 Method and system for producing gas and liquid in a subterranean well |
| 12/15/2005 | CA2565939A1 Separation of evolved gases from drilling fluids in a drilling operation |
| 12/15/2005 | CA2565161A1 High-velocity discharge equalizing system and method |
| 12/14/2005 | EP1604093A2 Method and apparatus for drilling a borehole with a borehole liner |
| 12/14/2005 | EP1485574A4 Method and system for controlling well circulation rate |
| 12/14/2005 | CN1708630A Once-through well completion |
| 12/13/2005 | US6973980 Petroleum drilling method and apparatus to cool and clean drill bit with recirculating fluid composition while reclaiming most water utilized and greatly reducing the normal consumption of water during drilling |
| 12/13/2005 | CA2285767C Indexing mechanism and apparatus incorporating the same |
| 12/09/2005 | CA2508635A1 Pressure relief nozzles |
| 12/08/2005 | WO2005116391A1 Suction housing for cuttings |
| 12/08/2005 | WO2005035934A3 Solid-liquid separation of oil-based muds |
| 12/08/2005 | WO2004096940A8 Water block removal with surfactant based hydrocarbonaceous liquid system |
| 12/08/2005 | US20050271559 showing a smooth ink discharge continuously and excellent in writing performance; colorant; water; a water soluble organic solvent; and a shear-thinning tackifier including at least a polysaccharide |
| 12/08/2005 | US20050269137 Separation of evolved gases from drilling fluids in a drilling operation |
| 12/08/2005 | US20050269135 Continuous positive flow backflash prevention system |
| 12/08/2005 | US20050269134 Underbalanced drilling method and apparatus |
| 12/08/2005 | US20050269104 Top drive systems |
| 12/08/2005 | US20050269085 Method for sealing lost circulation zones |
| 12/08/2005 | US20050269080 Method and apparatus for performing chemical treatments of exposed geological formations |
| 12/08/2005 | US20050269076 Erosion resistant aperture for a downhole valve or ported flow control tool |
| 12/08/2005 | US20050269075 High-velocity discharge equalizing system and method |
| 12/08/2005 | US20050269072 Wellbore top drive power systems & methods of use |
| 12/07/2005 | EP1327050B1 Cement shoe assembly for monobore well |
| 12/07/2005 | EP1214496B1 Electrical surface activated downhole circulating sub |
| 12/01/2005 | WO2005076803A3 Apparatus for changing wellbore fluid temperature |
| 12/01/2005 | US20050263326 Surge device for air drilling |
| 11/30/2005 | EP1264072B1 Method and arrangement for reducing dust-related problems in rock drilling |
| 11/30/2005 | CN2743529Y 泡沫发生器 Foam generator |
| 11/30/2005 | CN1703566A Cement through side pocket mandrel |
| 11/30/2005 | CN1703565A Drilling mud filtration device |
| 11/30/2005 | CN1229470C Aphron-containing oil base fluids and method of drilling a well therewith |
| 11/29/2005 | US6968911 Apparatus and methods for drilling |
| 11/29/2005 | US6968898 Drilling fluid is mixed with a weighted material, and the mixture is introduced into a well bore so that the mixture scours any particles accumulated in well bore; well-completion fluid is introduced into well bore that dissolves weighted material |
| 11/29/2005 | US6968893 Method and system for production of gas and water from a gas bearing strata during drilling and after drilling completion |
| 11/29/2005 | CA2337764C Apparatus and method for handling waste |
| 11/24/2005 | WO2005110020A2 Apparatus and method for modified horizontal directional drilling assembly |
| 11/24/2005 | US20050261137 Methods and fluid compositions for depositing and removing filter cake in a well bore |
| 11/24/2005 | US20050260111 Drilling mud remediation |
| 11/24/2005 | US20050257934 Flow through subassembly for a downhole drill string and method for making same |
| 11/23/2005 | EP1597439A1 Dredge device and dredge method |
| 11/23/2005 | CN2742118Y Downhole sand washing device for high pressure oil and water well with pressure |
| 11/23/2005 | CN1228534C Subsea well intervention vessel and drilling method |
| 11/22/2005 | US6966392 Method for varying the density of drilling fluids in deep water oil and gas drilling applications |
| 11/22/2005 | US6966377 Providing a low pressure condition in a wellbore region |
| 11/22/2005 | US6966375 Downhole surge pressure reduction and filtering apparatus |
| 11/22/2005 | US6966367 Methods and apparatus for drilling with a multiphase pump |
| 11/22/2005 | CA2311388C Tool cooling system |
| 11/22/2005 | CA2267778C Method and multi-purpose apparatus for dispensing and circulating fluid in wellbore casing |
| 11/22/2005 | CA2248749C Flow divider box for conducting drilling mud to selected drilling mud separation units |
| 11/20/2005 | CA2508056A1 Drilling mud remediation |
| 11/17/2005 | US20050252689 Multi seam coal bed/methane dewatering and depressurizing production system |
| 11/17/2005 | US20050252688 Drilling method |
| 11/17/2005 | US20050252685 Floatable drill cuttings bag and method and system for use in cuttings disposal |
| 11/17/2005 | US20050252661 Casing degasser tool |
| 11/16/2005 | EP1595057A1 Dynamic annular pressure control apparatus and method |
| 11/16/2005 | CN1227068C Recovery system and method for recovering solid granular material |
| 11/15/2005 | US6964302 Zeolite-containing cement composition |
| 11/15/2005 | CA2413745C Well control |
| 11/15/2005 | CA2322431C Method and apparatus for cementing casing in a wellbore |
| 11/15/2005 | CA2321650C A mill and a method for milling |
| 11/13/2005 | CA2507105A1 Casing degasser tool |
| 11/10/2005 | WO2004092528A3 Apparatus for radially expanding and plastically deforming a tubular member |
| 11/10/2005 | US20050250666 Foamer/sulfur scavenger composition and methods for making and using same |
| 11/10/2005 | US20050247487 Down hole air diverter |
| 11/10/2005 | CA2635728A1 Vibratory separator |
| 11/09/2005 | EP1592864A1 Valve and method for drilling with casing using pressurized drilling fluid |
| 11/09/2005 | EP1592863A1 Improved downhole apparatus |
| 11/09/2005 | EP1592862A1 Rock drill machine and flushing housing |
| 11/08/2005 | US6962215 Underbalanced well completion |
| 11/08/2005 | US6962214 Rotary seal for directional drilling tools |
| 11/03/2005 | WO2005103443A1 A method and a device for regulating a fluid flow between an outside and an inside of a well pipe |
| 11/03/2005 | WO2005103439A1 Drill cutting deoiling |
| 11/03/2005 | WO2005103438A2 Drilling method and assembly for drilling large-diameter holes |
| 11/03/2005 | US20050242512 Sealing device |
| 11/03/2005 | CA2563342A1 A method and a device for regulating a fluid flow between an outside and an inside of a well pipe |
| 11/02/2005 | EP1591165A2 Centrifuge assembly and method for gaining access to an accelerator |
| 11/02/2005 | EP1552104A4 System to reduce hydrostatic pressure in risers using buoyant spheres |
| 11/02/2005 | EP1373675B1 Method for drilling and drilling apparatus |
| 11/02/2005 | CN1691991A Thermal process for treating hydrocarbon-contaminated drill cuttings |
| 11/02/2005 | CN1690357A Openhole perforating device |
| 11/01/2005 | US6959773 real-time monitoring and adjustment of multi-viscous oil or synthetic fluid base with Newtonian properties; organometallic additive enhances electric potential effects; manganese naphthenate |
| 11/01/2005 | US6959762 Method and apparatus for formation damage removal |
| 11/01/2005 | CA2355815C Sealed bearing roller cone bit having anti-plugging device |
| 11/01/2005 | CA2245359C Pressure modulation valve assembly |
| 10/27/2005 | WO2005100731A1 System and method for controlling drill motor rotational speed |
| 10/27/2005 | US20050236305 Vibratory separators and screens for them |
| 10/27/2005 | US20050236191 Drill string valve assembly |