| 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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| 08/17/2011 | CN102155196A Dynamic laser perforation device capable of penetrating into rock under petroleum well |
| 08/17/2011 | CN102155195A Multi-control-unit multi-beam laser perforation device in oil well |
| 08/17/2011 | CN102155194A Laser perforation device in oil well |
| 08/17/2011 | CN102155174A Drilling foam slag discharging method |
| 08/17/2011 | CN102155173A Pulsed jet defoaming device |
| 08/17/2011 | CN102155163A Deepwater multifunctional water pump drilling system and installation method thereof |
| 08/17/2011 | CN102155150A Crushing mechanism with gas inlet pipe |
| 08/16/2011 | US7998908 Fluid loss control and well cleanup methods |
| 08/16/2011 | US7998905 Drilling fluid containing chlorosulfonated alpha-olefin copolymers |
| 08/16/2011 | US7997355 Apparatus for injecting impactors into a fluid stream using a screw extruder |
| 08/16/2011 | US7997340 Permanent downhole deployment of optical sensors |
| 08/16/2011 | US7997214 Offshore cargo rack for use in transferring palletized loads between a marine vessel and an offshore platform |
| 08/16/2011 | CA2648805C Downhole tool for rock drilling |
| 08/16/2011 | CA2554934C Cyclone assembly and method for increasing or decreasing flow capacity of a cyclone separator in use |
| 08/11/2011 | WO2011097625A1 Valving system and method of selectively halting injection of chemicals |
| 08/11/2011 | WO2011097101A1 Method and apparatus for autonomous downhole fluid selection with pathway dependent resistance system |
| 08/11/2011 | WO2011095600A2 Method of conducting well operations |
| 08/11/2011 | US20110192649 Flow diverter ring for mud saver valves |
| 08/11/2011 | CA2787332A1 Method and apparatus for autonomous downhole fluid selection with pathway dependent resistance system |
| 08/10/2011 | EP2352997A1 Methods and systems for characterizing lcm particle plugging and rheology in real time |
| 08/10/2011 | EP2352898A2 Non-aqueous breaker fluids and methods of use thereof |
| 08/10/2011 | EP1751390B1 Apparatus and method for modified horizontal directional drilling assembly |
| 08/10/2011 | EP1613834B1 Vibratory screening machine for earth drilling installation |
| 08/10/2011 | CN201924919U 超临界流体钻完井模拟试验装置 Drilling and completion of supercritical fluid simulation test device |
| 08/10/2011 | CN201924874U 封隔器 Packer |
| 08/10/2011 | CN201924850U 流量式井下漏点检测装置 Downhole flow leak detection device |
| 08/10/2011 | CN201924849U 综合录井气液分离干燥器 Comprehensive logging liquid separator dryer |
| 08/10/2011 | CN201924828U 多功能试验机用双向动力水龙头装置 Multifunction tester with two-way power swivel device |
| 08/10/2011 | CN102149897A Method for handling drill cuttings, dust collection system for rock drilling rig, and changer unit |
| 08/10/2011 | CN102149644A System and method for de-watering waste drilling fluids |
| 08/10/2011 | CN102146776A Continuous sand washing device for horizontal well |
| 08/09/2011 | US7992655 Dual gradient drilling method and apparatus with multiple concentric drill tubes and blowout preventers |
| 08/09/2011 | US7992654 Dual gradient drilling method and apparatus with an adjustable centrifuge |
| 08/09/2011 | US7992636 Device and method for retrieving debris from a well |
| 08/09/2011 | CA2637231C Apparatus and method for processing drill cuttings |
| 08/09/2011 | CA2622249C Device for the quantitative analysis of debris |
| 08/08/2011 | CA2731005A1 Flow diverter ring for mud saver valves |
| 08/04/2011 | WO2011071670A3 Multi-position tool actuation system |
| 08/04/2011 | WO2010144593A8 Dual acting rod piston control system |
| 08/04/2011 | US20110186298 Method And System For Treating A Subterranean Formation Using Diversion |
| 08/04/2011 | US20110185795 Test apparatus |
| 08/04/2011 | CA2788258A1 Online measuring assembly of the rheological properties of a drilling fluid and associated measuring method |
| 08/03/2011 | EP2350432A2 Drill pipe |
| 08/03/2011 | CN201917363U 一种电涡流传感器测量泥浆流量装置 An electric eddy current sensor mud flow device |
| 08/03/2011 | CN201915937U 一种测井涡轮流量计 Logging and turbine flowmeter |
| 08/03/2011 | CN201915871U 井下马达旁通阀 Downhole motor bypass valve |
| 08/03/2011 | CN102140911A Method and device for acquiring viscosity and density of drilling fluids in drilling process |
| 08/03/2011 | CN102140899A Workover fluid recycling vehicle |
| 08/02/2011 | US7989399 Drilling fluid and methods |
| 08/02/2011 | US7987929 Arrangement for processing dust |
| 08/02/2011 | US7987928 Injection system and method comprising an impactor motive device |
| 08/02/2011 | US7987915 Circulating sub with mudsaver for dispensing and circulating fluid in a well bore |
| 08/02/2011 | CA2634436C Methods, systems, and apparatus for production of hydrocarbons from a subterranean formation |
| 08/02/2011 | CA2617155C Wellbore fluids for casing drilling |
| 08/02/2011 | CA2465735C Flare stack safety system and method of use |
| 07/28/2011 | WO2011091140A2 Ball drop module |
| 07/28/2011 | WO2011088576A1 Wellbore obstruction-clearing tool and method of use |
| 07/28/2011 | WO2011088493A1 Storage apparatus |
| 07/28/2011 | WO2011071683A3 Offset interior slurry discharge |
| 07/28/2011 | WO2010150010A4 Apparatus and methods for forming and using subterranean salt cavern |
| 07/28/2011 | US20110182135 Enhanced Slurrification Method |
| 07/28/2011 | CA2787145A1 Wellbore filter screen and related methods of use |
| 07/28/2011 | CA2787141A1 Differential pressure wellbore tool and related methods of use |
| 07/27/2011 | EP2347088A2 Down hole valve device |
| 07/27/2011 | CN201909653U Direct-reading liquid level alarm |
| 07/27/2011 | CN201908640U Anti-buried horizontal well staged fracturing tubular column |
| 07/27/2011 | CN201908565U Base plate anchor rope drilling machine for coal mine tunnel |
| 07/27/2011 | CN102134976A Tunnel drilling hydraulic power reverse-circulation dual-walled drilling tool |
| 07/27/2011 | CN102134975A Vehicle-mounted drilling fluid solid control system |
| 07/27/2011 | CN102134964A Double-wall spindle power head for core drill |
| 07/27/2011 | CN101316641B Arrangement for processing dust |
| 07/26/2011 | US7985717 Methods of using drilling fluids containing biodegradable organophilic clay |
| 07/26/2011 | US7984772 Downhole centrifugal drilling fluid separator |
| 07/26/2011 | US7984770 Method for determining formation integrity and optimum drilling parameters during drilling |
| 07/26/2011 | US7984765 System and method for well intervention |
| 07/26/2011 | US7984761 Openhole perforating |
| 07/26/2011 | CA2689452C The use of sized barite as a weighting agent for drilling fluids |
| 07/21/2011 | WO2011087608A1 Downhole-adjustable flow control device for controlling flow of a fluid into a wellbore |
| 07/21/2011 | WO2011044227A3 Apparatuses and methods of manufacturing oilfield machines |
| 07/20/2011 | CN201902185U Hand-operated tank bottom puppet valve for drilling fluid solid control system |
| 07/20/2011 | CN201902184U Wellhead slurry desludging device |
| 07/20/2011 | CN201902183U Solid control system platform convenient to dismount |
| 07/20/2011 | CN102128047A Gas-slag separation and recovering system for drilling construction |
| 07/20/2011 | CN102128025A Method for determining drilling fluid density in salt-gypsum layer deflection |
| 07/20/2011 | CN102128021A Quantitative degasser with floater and trimming device thereof |
| 07/20/2011 | CN102128012A Method capable of avoiding blowout |
| 07/20/2011 | CN102128011A Rock debris annulus reinjection device and control method thereof |
| 07/19/2011 | US7980332 Downhole centrifugal drilling fluid separator |
| 07/19/2011 | US7980329 System for managing variable density drilling mud |
| 07/19/2011 | CA2487896C Drilling attachment |
| 07/14/2011 | WO2011085031A2 Rotating continuous flow sub |
| 07/14/2011 | WO2011084153A1 Well control systems and methods |
| 07/14/2011 | WO2011084093A1 Percussion rock drilling machine and drill rig |
| 07/14/2011 | WO2011028562A4 Isolation valve for subterranean use |
| 07/14/2011 | WO2011017105A3 Wellbore cleanout tool |
| 07/14/2011 | US20110168445 Downhole Downlinking System Employing a Differential Pressure Transducer |
| 07/14/2011 | US20110168397 Apparatus for use in top filling of tubulars and associated methods |
| 07/14/2011 | US20110168381 Osmotic Water Transfer System and Related Processes |
| 07/14/2011 | CA2846749A1 Rotating continuous flow sub |
| 07/14/2011 | CA2784593A1 Rotating continuous flow sub |