| 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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| 05/08/2013 | CN202926265U Anti-pollution well-washing valve for wellbore of heavy oil well |
| 05/08/2013 | CN202926264U Drilling fluid flow sensor |
| 05/08/2013 | CN202926263U Settlement type sand removal box |
| 05/08/2013 | CN202926262U Coal powder dust catcher |
| 05/08/2013 | CN202926261U Dustproof cover of drilling hole in wall surface |
| 05/08/2013 | CN202926260U Simple cement discharging device for well drilling |
| 05/08/2013 | CN202926259U Annular pulsed water jet generator |
| 05/08/2013 | CN202926246U Long-tail-pipe casing-corrosion-preventing well flushing protection device |
| 05/08/2013 | CN202921085U Oilfield flooding well mouth filtering system |
| 05/08/2013 | CN103089223A Solar Plant For Enhanced Oil Recovery |
| 05/08/2013 | CN103089178A Torque-free drilling machine |
| 05/08/2013 | CN103089177A Drilling liquid fixing and control system and control technology thereof |
| 05/08/2013 | CN103089176A Drilling liquid fixing and control system |
| 05/08/2013 | CN103089148A Control system special for down-the-hole drill carriage |
| 05/08/2013 | CN103087691A Polyamine strong inhibitor for drilling fluid, and preparation method thereof |
| 05/08/2013 | CN101338652B Method and device for executing cleaning operation for well |
| 05/07/2013 | US8434569 Short mud saver for use with top drive or kelly |
| 05/02/2013 | WO2013063334A1 Method and apparatus for down hole fluid conditioning |
| 05/02/2013 | WO2013059971A1 Well bore pressure model prediction system control method |
| 05/02/2013 | WO2013059878A1 Reverse circulation hammer spline arrangement improvements |
| 05/02/2013 | WO2013036415A3 Use of nano-sized phyllosilicate minerals in viscoelastic surfactant fluids |
| 05/02/2013 | WO2013013993A3 Device for producing a bore in the ground, rotary drive device and rotary seal arrangement |
| 05/02/2013 | WO2011112869A9 Dual ball upper internal blow out preventer valve |
| 05/02/2013 | CA2852971A1 Reverse circulation hammer spline arrangement improvements |
| 05/01/2013 | EP2586962A1 System for evacuating sludge for a trench excavating machine |
| 05/01/2013 | EP2585672A2 Fluid partition unit |
| 05/01/2013 | EP2585671A2 Oilfield equipment and related apparatus and method |
| 05/01/2013 | EP2585228A2 Screening methods and apparatus |
| 05/01/2013 | CN202914070U Drilling and logging integrated comprehensive instrument system for supporting remote monitoring |
| 05/01/2013 | CN202913996U Residue discharging device |
| 05/01/2013 | CN202913995U Drilling well fluid steering switchover control system |
| 05/01/2013 | CN202913994U Drill-pulling circulation head |
| 05/01/2013 | CN202913993U Sand-settling preventing mud flow measurement groove |
| 05/01/2013 | CN202913992U Underground coal mine dry-type drilling three-stage dust removal device |
| 05/01/2013 | CN202913991U Down-hole high-frequency pressure pulse generation device |
| 05/01/2013 | CN202913990U Falling object protecting sand washing pen point |
| 05/01/2013 | CN103080467A Variable flow restrictor for use in a subterranean well |
| 05/01/2013 | CN103080461A Optimization of vacuum systems and methods for drying drill cuttings |
| 05/01/2013 | CN103075140A Device and method for realizing corrosion communication of thin salt layer |
| 05/01/2013 | CN103075122A Solid control processor with multilayer and multispeed functions |
| 05/01/2013 | CN103075101A Mining multi-logical protection loop and multi-linkage functional drill hydraulic system |
| 04/30/2013 | CA2717490C On-the-fly acid blender with sampling equipment |
| 04/30/2013 | CA2612348C Recycling of oil-based drilling muds |
| 04/25/2013 | WO2013058756A1 Protection of a safety valve in a subterranean well |
| 04/25/2013 | WO2012173972A3 Managing treatment of subterranean zones |
| 04/25/2013 | WO2012121896A3 Well treatment methods and systems |
| 04/24/2013 | CN202900171U Wellhead fine filter backwash device for water injection well |
| 04/24/2013 | CN202900159U Oil pipe underground constant pressure valve |
| 04/24/2013 | CN202900150U Well flushing type step-by-step deblocking packer |
| 04/24/2013 | CN202900108U Water pipe nozzle |
| 04/24/2013 | CN202900107U Drilling tool deslagging device of drilling machine |
| 04/24/2013 | CN202900106U Oil-water well simple backwashing valve |
| 04/24/2013 | CN202900105U Flow sensor for oil field mud |
| 04/24/2013 | CN202900104U Sand collecting device with pressing drilling plug |
| 04/24/2013 | CN202900103U Double-layer movable module type platform |
| 04/24/2013 | CN202900102U Base seat for drilling fixing and controlling equipment |
| 04/24/2013 | CN202900101U Ring-shaped screen |
| 04/24/2013 | CN202900100U Horizontal well underground rotational flow sand wash tool |
| 04/24/2013 | CN202900099U Wellhead device of concentric double-skin tubular column reverse circulation continuous flushing coal powder system |
| 04/24/2013 | CN202900078U Horizontal well section cuttings bed cleaning tool |
| 04/24/2013 | CN202900042U Jet boring machine |
| 04/24/2013 | CN103069101A Method and system for controlling a compressor at a rock drilling apparatus and a rock drilling apparatus |
| 04/24/2013 | CN103069100A Method and system for determining a variation in a flushing medium flow and rock drilling apparatus |
| 04/24/2013 | CN103065446A Wireless remote control technology in well field solid control circuit |
| 04/24/2013 | CN103061699A Foam drilling experiment system |
| 04/24/2013 | CN103061698A Automatic throttling pipe converging system |
| 04/24/2013 | CN103061697A Mud separating and circulating device |
| 04/24/2013 | CN103061696A Device for collecting drilling cuttings |
| 04/24/2013 | CN102155194B Laser perforation device in oil well |
| 04/24/2013 | CN101994494B Split dynamic depressurization device for oil gas well |
| 04/24/2013 | CN101994492B Annular space type foam drilling mechanical defoamer |
| 04/23/2013 | US8424619 Drilling fluid |
| 04/23/2013 | US8424604 Methods and devices for forming a wellbore with casing |
| 04/21/2013 | CA2770899A1 Portable reservoir frame |
| 04/20/2013 | CA2793417A1 Working/control fluid for heavy and extra-heavy crude wells |
| 04/18/2013 | WO2013055706A1 Wellbore influx detection with drill string distributed measurements |
| 04/18/2013 | WO2013055389A1 Horizontal directional drilling system |
| 04/18/2013 | WO2013055351A1 Alignment of bop stack to facilitate use of a rotating control device |
| 04/18/2013 | WO2013055330A1 Independent dual actuated subsurface safety valve |
| 04/18/2013 | WO2013055226A1 Device and method for controlling return flow from a bore hole |
| 04/18/2013 | WO2012134302A3 Method and device for preventing a mud relief valve from incorrect opening |
| 04/18/2013 | US20130092637 Systems and Methods for Drying Drill Cuttings |
| 04/17/2013 | EP2581141A1 Plant for treating drilling muds |
| 04/17/2013 | CN202882814U Safe drilling pneumatic jet flow three-proofing device for outburst coal layer |
| 04/17/2013 | CN202882813U Bypass valve of screw drill |
| 04/17/2013 | CN202882812U Sand prevention well washing valve structure |
| 04/17/2013 | CN202882811U Formate waste drilling fluid recycle device |
| 04/17/2013 | CN202882810U Novel multifunctional dust falling device |
| 04/17/2013 | CN202882809U Dustproof slag discharge device of anchoring drilling machine |
| 04/17/2013 | CN202882808U Oil-water well washing double-way flow guide draining device |
| 04/17/2013 | CN202882807U Large-inclination directional well downhole single-direction sand-washing flood-relief sand-stopping device |
| 04/17/2013 | CN202882806U Drill column type debris bed eliminating tool |
| 04/17/2013 | CN202882805U Two-channel phase-changing watering and hot-washing device |
| 04/17/2013 | CN202882785U Inner inserting-pulling connecting tool on pipe wall |
| 04/17/2013 | CN103046948A Device and method for preventing coal drilling and cutting or gas emission |
| 04/17/2013 | CN103046883A Continuous cyclic drilling process applicable to air drilling |
| 04/17/2013 | CN103046863A Pneumatic hammer drill with grouting pipe |
| 04/17/2013 | CN101899969B Real-time on-site drilling full parameter optimization method |
| 04/13/2013 | CA2792639A1 Plant for treating drilling muds |
| 04/11/2013 | WO2013052133A1 Fluid containment and management system |