| 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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| 07/25/2013 | WO2012066327A3 Drilling method for drilling a subterranean borehole |
| 07/25/2013 | US20130186636 Method for circulating a fluid entry out of a subsurface wellbore without shutting in the wellbore |
| 07/24/2013 | EP2617939A1 Installation for drilling a well into a soil and associated drilling method. |
| 07/24/2013 | EP2616630A2 Method and apparatus for precise control of wellbore fluid flow |
| 07/24/2013 | EP2616629A2 Managed pressure drilling apparatus |
| 07/24/2013 | EP2616628A2 Return fluid separator |
| 07/24/2013 | EP2616627A2 Feeder with screen for shaker |
| 07/24/2013 | CN203081417U Multifunctional integrated gas lift technique pipe column |
| 07/24/2013 | CN203081411U Antiseptic, anti-scale and gas-lift integral completion pipe string |
| 07/24/2013 | CN203081389U Novel blowout-preventing mud flow guiding device of drilling tool |
| 07/24/2013 | CN203081364U Continuous circulation short joint suitable for air drilling |
| 07/24/2013 | CN203081363U Side-direction vertical type single-way valve for air drilling continuous cycle short connection |
| 07/24/2013 | CN203081362U Slurry separation and circulation device |
| 07/24/2013 | CN203081361U Oil-based drilling cutting in-site processing device |
| 07/24/2013 | CN203081360U Rotary deslagging and dedusting device for drilling of pneumatic down-the-hole hammer |
| 07/24/2013 | CN203081359U Combined type drilling machine powder dispersion-prevention device |
| 07/24/2013 | CN203081358U Pneumatic controlled and oil immersed friction type clutch applied to water well drilling rig |
| 07/24/2013 | CN203081357U Hydraulic self-rotation sand-washing tool |
| 07/24/2013 | CN103216202A Pile bottom cleaning device |
| 07/24/2013 | CN103216201A Device for packing and separating mining gas-water slag |
| 07/24/2013 | CN103216195A Dual-purpose device for drilling and cleaning well |
| 07/23/2013 | US8490720 Self aligning mud saver valve seat |
| 07/23/2013 | US8490719 Method and apparatus for controlling bottom hole pressure in a subterranean formation during rig pump operation |
| 07/23/2013 | US8490552 Offshore cargo rack for use in transferring palletized loads between a marine vessel and an offshore platform |
| 07/23/2013 | CA2565939C Separation of evolved gases from drilling fluids in a drilling operation |
| 07/18/2013 | WO2013106843A1 Density based mechanical valve control system |
| 07/18/2013 | WO2013106259A1 Treatment system for multiple zones |
| 07/18/2013 | WO2013106055A2 Esp thrust module with enhanced lubrication and temperature dissipation |
| 07/18/2013 | WO2013105797A1 Apparatus for treating slime using drill for ground excavation and method for same |
| 07/18/2013 | WO2013104069A1 Fluid or slurry pulsing casing/liner shoe |
| 07/18/2013 | WO2013034998A3 Auxiliary equipment for use with drilling apparatus |
| 07/18/2013 | WO2012041996A3 Rotating control device |
| 07/18/2013 | CA2860908A1 Nested dual drill pipe |
| 07/18/2013 | CA2832959A1 Esp thrust module with enhanced lubrication and temperature dissipation |
| 07/17/2013 | EP2615239A1 Device and method for drilling shafts in a ground consisting of rock, clay and/or related materials |
| 07/17/2013 | EP2614212A2 Shank adapter with corrosion protection |
| 07/17/2013 | EP2614210A2 Offshore thermal treatment of drill cuttings fed from a bulk transfer system |
| 07/17/2013 | CN203067017U Device for preventing spraying of coal or gas in drilling and cutting |
| 07/17/2013 | CN203066914U Cleaner for small-diameter holes |
| 07/17/2013 | CN203066913U Hole drilling construction equipment of reverse circulation drill |
| 07/17/2013 | CN203066912U Waste drilling mud ground-touch free receiving and screening device |
| 07/17/2013 | CN203066911U Blowout control and dustfall device for drilling engineering |
| 07/17/2013 | CN203066910U Negative-pressure drilling system |
| 07/17/2013 | CN203061285U Three-phase separation system of mud, debris and metal particles |
| 07/17/2013 | CN103206180A System and method for controlling dropping speed of bottom-hole pressure of coal-bed gas well |
| 07/17/2013 | CN103206179A Skid-mounted landing-free harmless treatment device for drilling mud of oil field |
| 07/17/2013 | CN103206178A Eccentric rotary guide horizontal well mud cake cleaning device |
| 07/17/2013 | CN102392676B Integrated device for separating gas, water and slag |
| 07/17/2013 | CN101965436B Shaker deck adjustment apparatus |
| 07/17/2013 | CN101757874B Viscoelastic surfactant fluids and related methods of use |
| 07/16/2013 | CA2723591C Methods and aqueous based wellbore fluids for reducing wellbore fluid loss and filtrate loss |
| 07/11/2013 | WO2013103907A1 Pressure activated flow switch for a downhole tool |
| 07/11/2013 | WO2013103677A1 In-riser hydraulic power recharging |
| 07/11/2013 | WO2013032687A3 Injection of fluid into selected ones of multiple zones with well tools selectively responsive to magnetic patterns |
| 07/11/2013 | WO2013028335A3 Downhole fluid flow control system having a fluidic module with a bridge network and method for use of same |
| 07/11/2013 | US20130175043 Downhole swivel apparatus and method |
| 07/10/2013 | CN203050647U Rotational flow type sand prevention anchor |
| 07/10/2013 | CN203050623U Pressure balance check valve for coiled tubing separate-layer fracturing |
| 07/10/2013 | CN203050577U Bidirectional suspension type cavitation jet device |
| 07/10/2013 | CN203050576U Foam drilling experiment system |
| 07/10/2013 | CN203050575U Multifunctional well logging tank |
| 07/10/2013 | CN203050574U Coiled tubing drilling cutting gathering device |
| 07/10/2013 | CN203050573U Sand discharge device for cyclones |
| 07/10/2013 | CN203050572U Drilling orifice dust collector |
| 07/10/2013 | CN203050571U High-pressure cyclone blockage-removing process string of horizontal well |
| 07/10/2013 | CN203050525U Rotary grout-jetting nozzle with forced grout-returning function |
| 07/10/2013 | CN203050495U Water faucet |
| 07/10/2013 | CN203043712U Filter cartridge for continuous tubing drilling cutting trapping device |
| 07/10/2013 | CN103195382A Sediment processing method of bottom of pile with deterrents |
| 07/10/2013 | CN103195381A Mud system for construction of working well of cable tunnel |
| 07/10/2013 | CN103195380A Hole sealing device |
| 07/10/2013 | CN103195379A Drilling machine wet type powder exhaust device and application thereof |
| 07/10/2013 | CN103195378A Negative-pressure jet spraying dust suppression device |
| 07/10/2013 | CN103195372A Spiral drill bit, foam drilling device and foam drilling process |
| 07/10/2013 | CN102155163B Deepwater multifunctional water pump drilling system and installation method thereof |
| 07/10/2013 | CN101424169B Ocean petroleum filling well drilling safety valve |
| 07/09/2013 | US8479817 Method and composition for curing lost circulation |
| 07/09/2013 | US8479812 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 07/04/2013 | WO2013101260A1 Drilling fluid diverting sub |
| 07/04/2013 | WO2013101254A1 System and method for treating a contaminated substrate |
| 07/04/2013 | WO2012172332A3 Process for utilising waste drill cuttings in plastics |
| 07/04/2013 | US20130168100 Apparatuses and Methods for Determining Wellbore Influx Condition Using Qualitative Indications |
| 07/04/2013 | US20130167627 Method and system for determining a variation in a flushing medium flow and rock drilling apparatus |
| 07/03/2013 | EP2610427A1 Apparatuses and methods for determining wellbore influx condition using qualitative indications |
| 07/03/2013 | EP2609286A1 Variable flow restrictor for use in a subterranean well |
| 07/03/2013 | EP2609283A2 Pump through circulating and or safety circulating valve |
| 07/03/2013 | EP2609282A1 System and method for managed pressure drilling |
| 07/03/2013 | EP2609281A1 Method and system for controlling a compressor at a rock drilling apparatus and a rock drilling apparatus |
| 07/03/2013 | EP2609280A1 Method and system for determining a variation in a flushing medium flow and rock drilling apparatus |
| 07/03/2013 | EP2609169A1 Drilling fluid and method for drilling in coal-containing formations |
| 07/03/2013 | CN203035151U Well head device for water hole sand washing |
| 07/03/2013 | CN203035136U Ground sand control device used for natural gas well |
| 07/03/2013 | CN203035135U Mud purification device provided with heating coil |
| 07/03/2013 | CN203035134U Forward and reverse washing well oil-well pump |
| 07/03/2013 | CN203035072U Power system of drilling machine |
| 07/03/2013 | CN103184841A Apparatuses and methods for determining wellbore influx condition using qualitative indications |
| 07/03/2013 | CN101160446B Pumping system |
| 07/02/2013 | US8474551 Hydrocarbon recovery drill string apparatus, subterranean hydrocarbon recovery drilling methods, and subterranean hydrocarbon recovery methods |
| 06/27/2013 | WO2013095939A1 Method and control devices for production of consistent water quality from membrane-based water treatment for use in improved hydrocarbon recovery operations |
| 06/27/2013 | WO2013095801A1 Method for the removal or suppression of interfering metal ions using environmentally friendly competitive binders |