| 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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| 06/08/2011 | CN201857912U Sand flushing device of horizontal well |
| 06/08/2011 | CN201857911U Integrative cleaner for desanding and desilting drilling fluid |
| 06/08/2011 | CN1970990B Method for measuring return flow in petroleum drilling and device therefor |
| 06/08/2011 | CN102086764A Supercritical fluid well drilling and completion simulation test device |
| 06/07/2011 | US7956015 Equivalent circulating density control in deep water drilling |
| 06/07/2011 | US7956012 Oil field treatment fluids with viscosified brines |
| 06/03/2011 | WO2011063463A1 Cuttings wash apparatus and method |
| 06/03/2011 | CA2719610A1 Fluid composition comprising anti-accretion additives and methods of use thereof |
| 06/02/2011 | US20110127085 Modular connector and method |
| 06/01/2011 | CN201851049U Mud and gas separator for well drilling |
| 06/01/2011 | CN201851048U Gas lift mixed discharging sand removing tank |
| 06/01/2011 | CN201851047U Multistage cyclone desanding device |
| 06/01/2011 | CN1985066B Apparatus and method for modified horizontal directional drilling assembly |
| 06/01/2011 | CN102084085A Wellbore system |
| 06/01/2011 | CN102084083A Mixing apparatus and method of using same |
| 06/01/2011 | CN102080546A Simple reverse circulation drilling rig |
| 06/01/2011 | CN102080530A Method for constructing horizontal coal bed gas well and vertical drainage and mining well |
| 06/01/2011 | CN102080529A Coal-bed gas thermal cavity completion method |
| 06/01/2011 | CN102080510A Submarine mud suction system and method for realizing marine riser-free mud reclamation well drilling |
| 05/31/2011 | US7950668 Remote operated actuator system for drill string internal blowout preventer |
| 05/31/2011 | US7950475 Percussion drilling assembly having a floating feed tube |
| 05/31/2011 | US7950474 Dual stripper rubber cartridge with leak detection |
| 05/31/2011 | US7950462 Scale inhibitors compatible with sandstone acidizing |
| 05/31/2011 | CA2643935C Methods of preparing hydrocarbon, water and organophilic clay emulsions and compositions thereof |
| 05/31/2011 | CA2437678C Apparatus and method for wellbore isolation |
| 05/26/2011 | WO2011061239A2 Downhole circulation apparatus |
| 05/26/2011 | WO2011038861A3 Method and composition to prevent fluid mixing in pipe |
| 05/26/2011 | WO2011028562A3 Isolation valve for subterranean use |
| 05/26/2011 | WO2011022211A3 Alternating flow resistance increases and decreases for propagating pressure pulses in a subterranean well |
| 05/26/2011 | WO2011018623A3 System and method for servicing a wellbore |
| 05/26/2011 | US20110125333 System, Program Products, and Methods For Controlling Drilling Fluid Parameters |
| 05/26/2011 | CA2781468A1 Downhole circulation apparatus |
| 05/25/2011 | EP2323754A1 System and method for blending a dry material with a fluid in a closed environment |
| 05/25/2011 | CN201843609U Automatic geological logging rock waste sampling and cleaning device |
| 05/25/2011 | CN201843583U Return-flow type bypass valve of spiral drilling rig |
| 05/25/2011 | CN201843563U Mechanical downhole inner and outer integrated blowout preventer |
| 05/25/2011 | CN201843552U Circulating working fluid filter |
| 05/25/2011 | CN201843547U Dust removal tool in blowout preventer |
| 05/25/2011 | CN201843546U Bidirectional bypass valve for drilling |
| 05/25/2011 | CN201843545U Double shear-pin bypass valve for well drilling |
| 05/25/2011 | CN201843544U Metal-sealed one-way valve |
| 05/25/2011 | CN201843543U Device for preventing wellhead drilling fluid from splashing |
| 05/25/2011 | CN102076928A Apparatus for cleaning boreholes within substrates |
| 05/25/2011 | CN102071926A Method and device for measuring full-hole annular pressure and method and device for controlling same |
| 05/25/2011 | CN102071899A Gradually unpacked washable well packer |
| 05/25/2011 | CN102071891A Cleaning device in oil pipe |
| 05/25/2011 | CN102071873A Clean water drilling process of coal bed gas well |
| 05/24/2011 | CA2477242C Dynamic annular pressure control apparatus and method |
| 05/19/2011 | WO2011059912A1 Methods and systems for drilling boreholes |
| 05/19/2011 | WO2011058031A2 System and method for drilling a subsea well |
| 05/19/2011 | WO2011057774A2 Integrated choke manifold system for use in a well application |
| 05/19/2011 | WO2011022323A3 Self aligning mud saver valve seat |
| 05/19/2011 | WO2009137537A3 Signal operated tools for milling, drilling, and/or fishing operations |
| 05/19/2011 | US20110116098 Apparatus and method for detecting pressure signals |
| 05/19/2011 | US20110114542 Vibratory separator motion |
| 05/19/2011 | US20110114391 Grip head for an earth boring unit |
| 05/19/2011 | US20110114390 Sleeve arrangement |
| 05/19/2011 | US20110114389 Ecologically sensitive mud-gas containment system |
| 05/19/2011 | US20110114306 Methods and Devices for Forming a Wellbore with Casing |
| 05/19/2011 | DE102009050059A1 Dosiervorrichtung und Verfahren zum Einbringen eines pulverförmigen Mediums in eine Flüssigkeit A metering device and process for introducing a powder into a liquid medium |
| 05/18/2011 | EP2321490A1 Method for handling drill cuttings, dust collection system for rock drilling rig, and changer unit |
| 05/18/2011 | EP2321489A1 Treatment and reuse of oilfield produced water for operations in a well |
| 05/18/2011 | CN201835774U Dosing system of foaming agent of gas well |
| 05/18/2011 | CN102061933A Long drilling positioning construction process |
| 05/17/2011 | US7943554 Wellbore fluid comprising at least one polymer containing pendant alkyl groups |
| 05/17/2011 | US7942215 Drilling fluids for oil and gas reservoirs with high carbonate contents |
| 05/17/2011 | US7942200 Downhole fluid injection dispersion device |
| 05/12/2011 | WO2011054111A1 Electrically conductive oil base drilling fluids containing carbon nanotubes |
| 05/12/2011 | WO2011017424A3 Tubular system with selectively engagable sleeves and method |
| 05/12/2011 | WO2011009145A3 Tension-activated fluid bypass device |
| 05/12/2011 | US20110111991 Gelled Hydrocarbon System and Method With Dual-Function Viscosifier/Breaker Additive |
| 05/12/2011 | US20110108282 Apparatus and Method for Managed Pressure Drilling |
| 05/11/2011 | EP2318654A2 High rate stimulation method for deep, large bore completions |
| 05/11/2011 | EP2318643A1 Apparatus and method for data transmission from a rotating control device |
| 05/11/2011 | CN201826799U Device for splitting flow from completion drilled well head |
| 05/11/2011 | CN201826790U Core sampler |
| 05/11/2011 | CN201826787U Dust-settling device for mine drilling machine |
| 05/11/2011 | CN201826786U High-pressure rotary spraying faucet for drill rod of drilling machine |
| 05/11/2011 | CN201826785U Dedusting device of drilling orifice |
| 05/11/2011 | CN201826784U Iron chip remover for drilling fluid vibrating sieves |
| 05/11/2011 | CN102057129A Arrangement and method comprising a flushing head for a rock drilling machine, and rock drilling machine comprising the arrangement |
| 05/10/2011 | US7939470 Invert emulsion drilling fluids comprising quaternary ammonium emulsifiers and argillaceous solids and methods of drilling boreholes |
| 05/10/2011 | CA2623581C Heavy oil drilling and recovery |
| 05/10/2011 | CA2446868C Apparatus and method for drilling a wellbore with casing and cementing the casing in the wellbore |
| 05/05/2011 | WO2011050500A1 Multi-level refined throttle manifold and automatic control system |
| 05/05/2011 | WO2010150010A3 Apparatus and methods for forming and using subterranean salt cavern |
| 05/05/2011 | US20110100715 Center discharge gas turbodrill |
| 05/04/2011 | EP2317064A2 Device for removing water from earth materials |
| 05/04/2011 | CN201818259U Remote control type drilling well leak stopping bypass joint |
| 05/04/2011 | CN201818258U Choke manifold for pressure-controlling drilling well |
| 05/04/2011 | CN201818257U Wellbore pressure management system |
| 05/04/2011 | CN201818256U Annular gap type mechanical defoamer for foam drilling |
| 05/04/2011 | CN201818255U Tensioning mechanism for screen mesh of vibratory screen |
| 05/04/2011 | CN201818240U Circulation tool for casing running |
| 05/04/2011 | CN1867617B Superabsorbent polymer aqueous paste and coating |
| 05/04/2011 | CN1777737B Method and apparatus for detecting while drilling underbalanced the presence and depth of water produced from the formation. |
| 05/04/2011 | CN102046914A Method and apparatus for facilitating continuous circulation of drilling mud during construction and maintenance of a well |
| 05/03/2011 | US7935237 Electrical treatment for oil based drilling or completion fluids |
| 05/03/2011 | CA2600125C Method and apparatus for slurry and operation design in cuttings re-injection |
| 04/28/2011 | WO2011048469A1 Subsea valve actuator having visual manual position indicator connected to a manual override shaft |