| 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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| 07/14/2011 | CA2783004A1 Percussion rock drilling machine and drill rig |
| 07/13/2011 | CN201896615U Experimental circulating device of recyclable foam base fluid used in sand flushing operation |
| 07/13/2011 | CN201896596U Rotary type mud vibrating screen |
| 07/13/2011 | CN102121357A Drilling fluid return flow measuring method and measuring device thereof |
| 07/12/2011 | US7975765 Enclosed circulation tool for a well |
| 07/12/2011 | CA2651944C Method and apparatus for cleaning drill cuttings |
| 07/12/2011 | CA2517407C Washpipe seal assembly |
| 07/12/2011 | CA2452861C Method of use and composition of pomace additive |
| 07/07/2011 | WO2011028193A3 Drill bit |
| 07/07/2011 | WO2010032018A3 Apparatus for use in top filling of tubulars and associated methods |
| 07/07/2011 | US20110162843 Process and apparatus to improve reliability of pinpoint stimulation operations |
| 07/07/2011 | CA2689810A1 Drilling mud tank |
| 07/06/2011 | EP2340351A1 Equipment for controlling amount of water used for binding dust |
| 07/06/2011 | CN201891427U Dust removal system for pneumatic dry drilling |
| 07/06/2011 | CN201891400U Jet pump switch |
| 07/06/2011 | CN201891399U Screen mesh compressing device of vibrating screen |
| 07/06/2011 | CN1601049B Automatic downlink system |
| 07/06/2011 | CN102116140A Construction method for enhancing extraction effect of ground coal bed gas |
| 07/06/2011 | CN101180447B Invert emulsion based completion and displacement fluid and method of use |
| 07/05/2011 | US7972995 Drilling fluid additive containing heated syrup solids |
| 07/05/2011 | US7971659 Foamer/sulfur scavenger composition and methods for making and using same |
| 07/05/2011 | US7971657 Drill cuttings transfer system and related methods |
| 07/05/2011 | US7971639 Device for conducting cementing operations and inflow regulation |
| 07/05/2011 | CA2635663C Method, system and apparatus for concentrating solids from drilling slurry |
| 06/30/2011 | WO2011079319A2 Subsea technique for promoting fluid flow |
| 06/30/2011 | WO2011079117A1 Foam optimization method for deliquifying wells |
| 06/30/2011 | WO2011076935A1 Downhole tool for borehole cleaning or for moving fluid in a borehole |
| 06/30/2011 | WO2011076851A1 Method of drilling and abrasive jet drilling assembly |
| 06/30/2011 | WO2011076846A1 Method of drilling and jet drilling system |
| 06/30/2011 | WO2011031836A3 Systems and methods for circulating out a well bore influx in a dual gradient environment |
| 06/30/2011 | WO2011030111A3 Improved methods and systems for integral blending and storage of materials |
| 06/30/2011 | CA2785588A1 Downhole tool for borehole cleaning or for moving fluid in a borehole |
| 06/30/2011 | CA2784992A1 Method of drilling and abrasive jet drilling assembly |
| 06/30/2011 | CA2784978A1 Method of drilling and jet drilling system |
| 06/29/2011 | EP2339110A1 Downhole tool for borehole cleaning or for moving fluid in a borehole |
| 06/29/2011 | EP2337927A2 Invert emulsion wellbore fluids and method for reducing toxicity thereof |
| 06/29/2011 | EP2337918A1 Method and drilling apparatus for down-the-hole drilling |
| 06/29/2011 | CN201885845U Negative pressure self-locking vertical pipe pressure sensor for petroleum drilling machine |
| 06/29/2011 | CN201883975U Drift size gauge tool for dredging, scraping and flushing well |
| 06/28/2011 | US7967084 External water delivery system for rock drills |
| 06/28/2011 | US7966875 Methods and apparatus for measuring formation properties |
| 06/28/2011 | CA2576053C Method and system for return of drilling fluid |
| 06/28/2011 | CA2497458C Dart-operated big bore by-pass valve |
| 06/28/2011 | CA2492797C Shale hydration inhibition agent and method of use |
| 06/23/2011 | US20110147087 Cuttings transfer system |
| 06/22/2011 | EP2334905A2 Method of determining borehole conditions from distributed measurement data |
| 06/22/2011 | EP2334893A2 Polymer gels as flow improvers in water injection systems |
| 06/22/2011 | CN201875005U Special shaft coupler for water faucet test run |
| 06/22/2011 | CN201874500U Multifunctional intelligent drilling-fluid monitor |
| 06/22/2011 | CN201874499U High-flow engine degasser |
| 06/22/2011 | CN201874498U Skid-mounted sealed drying treatment device for drilling cuttings |
| 06/22/2011 | CN201874497U Water supply device for drill rod |
| 06/22/2011 | CN102102497A Blowout prevention and dust prevention device |
| 06/22/2011 | CN102102491A Reverse expansion and reverse pumping method for slurry of horizontal directional drill |
| 06/22/2011 | CN101187297B Closed sand-washing sand-removing oil-collecting technology for oil and water well, and device therefor |
| 06/21/2011 | US7964538 Homogenous synthetic mud-to-cement cementing glasses |
| 06/21/2011 | US7964537 Air drilling misting fluid contains syrups |
| 06/21/2011 | CA2715718C Filter screen with molded end cap for oilfield screens |
| 06/21/2011 | CA2653587C A system and method for estimating supercharge pressure and initial pressure of a formation |
| 06/21/2011 | CA2648910C Drilling fluid flow diverter |
| 06/21/2011 | CA2600843C Control systems and methods for real time downhole pressure management (ecd control) |
| 06/21/2011 | CA2508665C Anchoring device for a wellbore tool |
| 06/16/2011 | WO2011071830A2 Fluid flow control device |
| 06/16/2011 | WO2011071683A2 Offset interior slurry discharge |
| 06/16/2011 | WO2011071670A2 Multi-position tool actuation system |
| 06/16/2011 | WO2011035251A3 Open-hole mudcake cleanup |
| 06/16/2011 | WO2011034694A3 Fracturing and gravel packing tool with shifting ability between squeeze and circulate while supporting an inner string assembly in a single position |
| 06/16/2011 | WO2011022324A3 Method for determining formation fluid control events in a borehole using a dynamic annular pressure control system |
| 06/16/2011 | WO2006118938A3 Method and apparatus for angularly positioning a shaker separator bed |
| 06/16/2011 | US20110139506 Pressure and flow control in drilling operations |
| 06/16/2011 | DE102008056261B4 Ventilzentrierung Ventilzentrierung |
| 06/16/2011 | CA2782343A1 Fluid flow control device |
| 06/15/2011 | EP2333232A2 Circulating sub |
| 06/15/2011 | EP2331789A1 An injection, sealing valving and passageway system |
| 06/15/2011 | EP2331787A1 Nitrogen-free invert emulsion wellbore fluid |
| 06/15/2011 | CN201865658U Foam drilling integrated logging engineering parameter collector |
| 06/15/2011 | CN201865607U Rotary water tap for drill |
| 06/15/2011 | CN201865606U Pressure manifold for drilling slurry pump with remote automatic control device |
| 06/15/2011 | CN201865605U Sleeve hanger cleaning tool for underwater well heads |
| 06/15/2011 | CN201865604U Continuous sand-washing device for horizontal wells |
| 06/15/2011 | CN201865568U Full-hydraulic multifunctional power head |
| 06/15/2011 | CN201862561U Double-track vibrating screen |
| 06/15/2011 | CN102094632A Mud pressure and density logging instrument |
| 06/15/2011 | CN102094614A Foam acid de-plugging technology |
| 06/15/2011 | CN102094586A Ground sand washing device for horizontal well and application method thereof |
| 06/15/2011 | CN102094578A Drilling mechanism |
| 06/15/2011 | CN101280682B Complete hydraulic self-drilling type side pressure equipment |
| 06/14/2011 | US7958948 Method and system for return of drilling fluid |
| 06/14/2011 | CA2630875C Drill fluid collecting device |
| 06/14/2011 | CA2539337C Method for pressurized mud cap and reverse circulation drilling from a floating drilling rig using a sealed marine riser |
| 06/09/2011 | WO2011068633A2 Pumping mud by electrohydrodynamic propulsion |
| 06/09/2011 | WO2011068581A1 Permanent magnet direct drive mud pump |
| 06/09/2011 | WO2011022284A3 Sliding sleeve locking mechanisms |
| 06/09/2011 | WO2011019645A3 Permanent magnet linear motor actuated safety valve and method |
| 06/09/2011 | WO2010113057A3 Apparatus and method for high pressure slurry pumping |
| 06/09/2011 | CA2778775A1 Permanent magnet direct drive mud pump |
| 06/08/2011 | EP2232004B1 A collecting device and a method of using same |
| 06/08/2011 | EP1730383B1 Spear type blow out preventer |
| 06/08/2011 | CN201858347U Clutch type transmission case of adjustable-speed coupler |
| 06/08/2011 | CN201857913U Well washing valve for completion of horizontal well |