| 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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| 08/22/2013 | WO2013120167A1 Desanding apparatus and system |
| 08/22/2013 | WO2013039579A3 Methods, systems and apparatus for circulating fluid within the annulus of a flexible pipe riser |
| 08/22/2013 | WO2012112926A3 Method for strengthening a wellbore |
| 08/22/2013 | US20130217602 Lubricating Compositions for Use with Downhole Fluids |
| 08/22/2013 | US20130213903 Screening methods and apparatus |
| 08/22/2013 | US20130213893 System and method for treating produced, desalted and flow back water |
| 08/22/2013 | DE102013000512A1 Vorrichtung zum Trockenbohren mit Bohrkleinabsaugung Apparatus for dry drilling with Bohrkleinabsaugung |
| 08/22/2013 | DE102012003757A1 Coupling system for separating and connecting multi-channel pipeline systems in drill rod piping system of hydraulic low hole drilling hammer, has male and female pieces detachably connected with one another by control part-male piece |
| 08/21/2013 | EP2627855A1 Cleaning device |
| 08/21/2013 | CN203145912U Bypassing controller |
| 08/21/2013 | CN203145873U Internal chip removing and drainage drilling machine |
| 08/21/2013 | CN203145872U Rear-assembled simple bypass valve for screw drilling tool |
| 08/21/2013 | CN203145871U Blowout-control hole device of coal mine |
| 08/21/2013 | CN203145870U Energy-saving solid control system |
| 08/21/2013 | CN203145869U Dust, ground slag and slurry protective device of driller |
| 08/21/2013 | CN203145868U Self-rotary type sand washing tool used for oil well casing pipe |
| 08/21/2013 | CN203145867U Multifunctional high-pressure cleaning vehicle for oil well |
| 08/21/2013 | CN203145866U Secondary hole cleaning equipment for cast-in-place piles |
| 08/21/2013 | CN203145847U Reverse circulation drill device additionally provided with main drill rod and check valve device |
| 08/21/2013 | CN203145825U Oversized-aperture pile foundation drilling machine |
| 08/21/2013 | CN103261570A An inflow assembly |
| 08/21/2013 | CN103261569A Downhole completion |
| 08/21/2013 | CN103256017A High-pressure water injection packer |
| 08/21/2013 | CN103256015A Wellhead back pressure controlling system of managed pressure drilling and wellhead back pressure controlling method |
| 08/21/2013 | CN103252295A Anti-disengaging sealed nozzle structure |
| 08/21/2013 | CN102425446B Gas-residue separating integrated critical pumping device used for coal mine underground hole-drilling |
| 08/21/2013 | CN102071899B Gradually unpacked washable well packer |
| 08/21/2013 | CN102046914B Method and apparatus for facilitating continuous circulation of drilling mud during construction and maintenance of a well |
| 08/21/2013 | CN101446191B Drilling well control parameter intelligent monitoring system |
| 08/20/2013 | US8511377 Open hole non-rotating sleeve and assembly |
| 08/20/2013 | CA2572779C System and method for drilling wellbores |
| 08/15/2013 | WO2013116921A1 Use of nanoparticles as a lubricity additive in well fluids |
| 08/15/2013 | WO2013116920A1 Novel nanoparticle-containing drilling fluids to mitigate fluid loss |
| 08/15/2013 | WO2013009437A3 Injection flocculation and compression dewatering unit for solids control and management of drilling fluids and methods relating thereto |
| 08/15/2013 | WO2013009435A3 Injection flocculation and compression dewatering unit for solids control and management of drilling fluids and methods relating thereto |
| 08/15/2013 | WO2012083068A3 Method of determining reservoir pressure |
| 08/15/2013 | WO2012055036A8 Submersible progressive cavity pump driver |
| 08/15/2013 | US20130206482 Pump positioned at a drill bit |
| 08/15/2013 | US20130206479 Drilling fluid and method for drilling in coal-containing formations |
| 08/15/2013 | US20130206386 System for Drilling a Borehole |
| 08/14/2013 | EP2625374A2 Fill up and circulating tool with well control feature |
| 08/14/2013 | EP2625371A2 Apparatus and system for processing solids in subsea drilling or excavation |
| 08/14/2013 | EP2625370A2 Method and apparatus for fluid treatment |
| 08/14/2013 | CN203129998U Device capable of washing well |
| 08/14/2013 | CN203129997U Anti-backflow sand-washing check valve |
| 08/14/2013 | CN203129996U Wet dust discharging device for drill |
| 08/14/2013 | CN203129995U Collector capable of measuring drill cutting volume rapidly |
| 08/14/2013 | CN203129948U Multifunctional cutting drilling machine |
| 08/14/2013 | CN203128702U Cleaning fiber |
| 08/14/2013 | CN103244066A Negative pressure drilling system preventing over-limit gas |
| 08/14/2013 | CN103244065A Wellhead mud backflow device and drilling mud cycle test system |
| 08/14/2013 | CN103244064A Mobile centrifugal separation system for oil drilling fluid |
| 08/14/2013 | CN103242812A Switchable foaming solution for foam drilling and well cleanup on oil and gas field |
| 08/14/2013 | CN102839914B Intermediate wind pressure high-speed rock drilling machine |
| 08/14/2013 | CN101432500B Fluid treatment system and method and use of same |
| 08/13/2013 | US8505635 Device for a top drive drilling machine for continuous circulation of drilling mud |
| 08/13/2013 | US8505620 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 08/08/2013 | WO2013116716A1 Multi-deck vibratory separator with series and parallel fluid processing capabilities |
| 08/08/2013 | WO2013116381A2 Dual gradient managed pressure drilling |
| 08/08/2013 | WO2013115924A1 Temporary protective cover for operative devices |
| 08/08/2013 | DE102012002417A1 Schmiermittelversorgung einer Bohrung zum Verlegen einer Rohrleitung A lubricant supply hole for laying a pipeline |
| 08/07/2013 | EP2623707A1 Method and system for improving drilling speed by using drill string vibration |
| 08/07/2013 | CN203114276U Ice layer rotary drilling cutting heat and drilling parameter experimental device |
| 08/07/2013 | CN203114242U Pressure automatic starting valve |
| 08/07/2013 | CN203114214U Washable device |
| 08/07/2013 | CN203113346U Cast-in-place pile dedicated guide tube for removing coating |
| 08/07/2013 | CN203108777U Fully-digital variable-frequency drilling fluid vibrating sieve |
| 08/07/2013 | CN103233693A Drilling pile foundation secondary hole cleaning device and method |
| 08/07/2013 | CN103233692A Dust removal device for mining outdoor down-the-hole drill |
| 08/07/2013 | CN102445242B Method and device for measuring slurry flow rate by eddy current sensor |
| 08/07/2013 | CN102182399B Construction method and equipment for reverse circulation drill to drill hole, hammer to form hole, expand hole and remove slag |
| 08/07/2013 | CN101711273B Well service compositions for consolidation of particulates in subterranean coal seams |
| 08/06/2013 | CA2734805C High performance water based fluids |
| 08/06/2013 | CA2714652C Downhole washout detection system and method |
| 08/06/2013 | CA2461639C Arrangement and method for regulating bottom hole pressures when drilling deepwater offshore wells |
| 08/01/2013 | WO2013112232A1 System and method for treatment of well completion equipment |
| 08/01/2013 | WO2013110197A1 Core barrel valve assembly |
| 08/01/2013 | WO2012141870A3 Circulation and rotation tool |
| 08/01/2013 | WO2012118611A3 Well plug and abandonment choke insert |
| 08/01/2013 | US20130192841 Dual gradient managed pressure drilling |
| 08/01/2013 | CA2862439A1 System and method for treatment of well completion equipment |
| 08/01/2013 | CA2861963A1 Core barrel valve assembly |
| 07/31/2013 | CN203097778U Oil-well sand washing and bailing integrated pipe column |
| 07/31/2013 | CN203097769U Dustproof cover |
| 07/31/2013 | CN203097768U Dust removal device of dry-type drilling hole |
| 07/31/2013 | CN203097767U Intelligent drilling machine solid control system |
| 07/31/2013 | CN203097766U Pump system for cleaning soft layer soil on bottom of rotary excavating pile hole |
| 07/31/2013 | CN203097765U Auxiliary cutting-carrying tool for coal-bed methane exploiting air inflation underbalanced drilling multilateral well |
| 07/31/2013 | CN203097730U Drilling, cutting and flushing integration drilling tool |
| 07/31/2013 | CN203090557U Slurry slag separator for slurry circulating system |
| 07/31/2013 | CN103225487A Orifice anti-splashing device |
| 07/31/2013 | CN103225484A Gas content spot sampling method and device |
| 07/31/2013 | CN101646836B Method and assembly for abrasive jet drilling |
| 07/30/2013 | US8496063 Separation of drill cuttings from drilling fluid on a seabed |
| 07/30/2013 | CA2612285C Novel activating mechanism for controlling the operation of a downhole tool |
| 07/30/2013 | CA2605606C Method and apparatus for angularly positioning a shaker separator bed |
| 07/25/2013 | WO2013109847A1 Interference reduction method for downhole telemetry systems |
| 07/25/2013 | WO2013108184A1 Installation for drilling a well into a soil and associated drilling method |
| 07/25/2013 | WO2013106890A1 Dual circulation drilling system |
| 07/25/2013 | WO2013009628A3 Compound angle wedge screen clamp for vibratory separator |