| 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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| 09/18/2013 | EP2638231A1 Controlled hydrostatic pressure completion system |
| 09/18/2013 | CN203201525U Reinforcing pipe bridge type plugging pipe column for water injection well casing damage |
| 09/18/2013 | CN203201503U 钻井液滤清器 Drilling Fluid Filter |
| 09/18/2013 | CN103306621A Atomizing generator for gallery drilling |
| 09/18/2013 | CN103306620A Pressure-transmitting pin snapping and fracturing automatic grouting valve float valve |
| 09/18/2013 | CN103306619A Automatic separator of mud rock powder |
| 09/18/2013 | CN103306604A Multifunctional running casing grouting device for well drilling |
| 09/18/2013 | CN102182439B Balanced-pressure perforation/negative-pressure backflow process |
| 09/18/2013 | CN101737018B Real-time monitoring method and device of underbalanced drilling well bottom pressure |
| 09/17/2013 | US8534383 Viscosity reducer for water-based muds |
| 09/17/2013 | US8534382 Hydrocarbon recovery drill string apparatus, subterranean hydrocarbon recovery drilling methods, and subterranean hydrocarbon recovery methods |
| 09/17/2013 | US8534369 Drill string flow control valve and methods of use |
| 09/17/2013 | CA2704677C Automated electrical stability meter |
| 09/17/2013 | CA2632634C Adjustable angle drive connection for a down hole drilling motor |
| 09/17/2013 | CA2546364C Method and system for controlling power consumption during a rock drilling process and a rock drilling apparatus therefore |
| 09/12/2013 | WO2013133824A1 Thermally induced liquidizing downhole tool |
| 09/12/2013 | WO2013093389A8 Unequal load collet and method of use |
| 09/12/2013 | US20130233786 System and method for treating water |
| 09/12/2013 | US20130233623 Consolidation |
| 09/12/2013 | US20130233620 Stabilizer with Drilling Fluid Diverting Ports |
| 09/12/2013 | US20130233558 Methods for Servicing Subterranean Wells |
| 09/12/2013 | US20130233553 Methods for Servicing Subterranean Wells |
| 09/11/2013 | CN203188968U Cable-passing well-washable packer |
| 09/11/2013 | CN203188949U Safe sand draining manifold for gas drilling |
| 09/11/2013 | CN203188948U Working fluid filtering device |
| 09/11/2013 | CN203188947U Ground anti-dust device for air positive circulation drilling technology |
| 09/11/2013 | CN203188946U Wall body punching and dust receiving folding paper hopper |
| 09/11/2013 | CN203188945U Drilling fluid four-phase separator debris removal pipe anti-blocking structure |
| 09/11/2013 | CN203188944U Wash pipe axial sealing structure |
| 09/11/2013 | CN103299024A Method and apparatus for fluid treatment |
| 09/11/2013 | CN102102497B Blowout prevention and dust prevention device |
| 09/10/2013 | US8530393 Methods to characterize fracture plugging efficiency for drilling fluids |
| 09/10/2013 | US8528666 Method and apparatus for disposal of cuttings |
| 09/10/2013 | US8528665 Drilling waste management system |
| 09/10/2013 | US8528660 System and method for safe well control operations |
| 09/10/2013 | CA2723811C Wellbore fluids containing sized clay material and methods of use thereof |
| 09/10/2013 | CA2707263C Breaker fluids and methods of using the same |
| 09/06/2013 | WO2013130530A1 Apparatus including load driven by a motor coupled to an alternator |
| 09/06/2013 | WO2013126988A1 Quick assembly hinge mechanism for joining first and second panel members |
| 09/06/2013 | WO2012148807A3 Mechanically actuated casing drive system tool |
| 09/05/2013 | US20130228532 Shaker and degasser combination |
| 09/05/2013 | US20130228380 Clog free high volume drill cutting and waste processing offloading system |
| 09/05/2013 | US20130228376 Flow diverter ring for mud saver valves |
| 09/05/2013 | US20130228371 Rig with clog free high volume drill cutting and waste processing system |
| 09/05/2013 | US20130228336 Methods for Servicing Subterranean Wells |
| 09/04/2013 | CN203177540U Water source heat pump system and well self-cleaning device thereof |
| 09/04/2013 | CN203175458U Drilled hole anti-splash device |
| 09/04/2013 | CN203175442U Skid-mounted oil field drilling mud harmless treatment device preventing mud from falling to ground |
| 09/04/2013 | CN203175441U Mud system used for cable tunnel working well construction |
| 09/04/2013 | CN203175440U Cleaning and rapid connection device of wellhead pipelines |
| 09/04/2013 | CN203175439U Solid control disposing machine with multiple layers and multiple speeds |
| 09/04/2013 | CN203175438U Operating tool string clamping-resisting device for sand washing operation |
| 09/04/2013 | CN203175437U Vehicle-mounted mud pump unit device |
| 09/04/2013 | CN203175399U Underground full-displacement pressurizing device |
| 09/04/2013 | CN203175388U Roof suspension expansion screw puncher |
| 09/04/2013 | CN103277089A Well-drilling early overflow loss ground monitoring device |
| 09/04/2013 | CN103277059A Negative pressure combined-sand-washing and forced-sand-draining device |
| 09/04/2013 | CN103277037A Pipe pile leading-hole construction method under boulder cluster geological condition |
| 09/04/2013 | CN102235164B Double-flow automatic measurement and regulation instrument for water injection well |
| 09/04/2013 | CN101852076B Underground working condition simulation method for controlled pressure drilling experiment and test |
| 09/03/2013 | US8524638 Method to characterize fracture plugging efficiency for drilling fluids |
| 09/03/2013 | US8522898 Method for dispersing aqueous based drilling fluid for drilling subterranean boreholes |
| 09/03/2013 | CA2656632C Boring head with new protection hood |
| 09/03/2013 | CA2606415C Device for extracting at least one type of gas contained in a drilling mud, an analysis arrangement and a related extraction method |
| 09/03/2013 | CA2512437C Method of controlling a well |
| 08/29/2013 | WO2013126863A1 Mud pulse telemetry mechanism using power generation turbines |
| 08/29/2013 | WO2013126639A1 Hybrid aqueous-based suspensions for hydraulic fracturing operations |
| 08/29/2013 | WO2013126625A2 System and method for treating produced, desalted and flow back water |
| 08/29/2013 | WO2013126064A1 Well drilling systems and methods with pump drawing fluid from annulus |
| 08/29/2013 | WO2012175658A3 Tubular device with radiofrequency communication for well head |
| 08/29/2013 | WO2012095340A9 Gravity based fluid trap |
| 08/29/2013 | US20130220623 Actuator for dual drill string valve and rotary drill string valve configuration therefor |
| 08/29/2013 | US20130220622 Actuator for dual drill string valve and drill string valve configurations therefor |
| 08/29/2013 | US20130220610 Methods and multi-purpose apparatus for dispensing and circulating fluid in wellbore casing |
| 08/29/2013 | US20130220596 Wellbore cleaning method and apparatus |
| 08/28/2013 | EP2630325A2 Remotely controllable fluid flow control assembly |
| 08/28/2013 | CN203161184U Well-flushing anti-pollution acidification production tool |
| 08/28/2013 | CN203161140U Novel drilling water tap |
| 08/28/2013 | CN203161139U Washing valve and oil pumping well |
| 08/28/2013 | CN203161138U Grouting system provided with metering device |
| 08/28/2013 | CN203161137U Mud purification and recycling device for cut-off wall construction with percussion drill |
| 08/28/2013 | CN203161136U Scrap capture device for flow-back fluid during test |
| 08/28/2013 | CN203161135U Dust cover capable of weighing drillings |
| 08/28/2013 | CN203161134U Rock cutting pre-separating mechanism of drilling-liquid four-phase separator |
| 08/28/2013 | CN203161133U Fluid injecting pipeline used in drilling fluid preparing process |
| 08/28/2013 | CN203161132U Underwater sediment removing cylinder of rotary pile drilling machine |
| 08/28/2013 | CN203161082U Mining multi-logic protective loop and multi-linkage-function drilling machine hydraulic system |
| 08/28/2013 | CN203161076U Pile foundation drilling machine with ultra-large aperture |
| 08/28/2013 | CN103270242A Drilling method for drilling a subterranean borehole |
| 08/28/2013 | CN103266876A Fracturing working method of multilevel hydraulic spraying segmentation fracturing tubular column |
| 08/28/2013 | CN103266875A Fracturing operation method of multistage hydraulic jet staged fracturing tubular column |
| 08/28/2013 | CN103266863A Gravity type slurry-mud separating system and slurry-mud separating process |
| 08/28/2013 | CN103266862A Orifice dust collector for pneumatic downhole drills |
| 08/28/2013 | CN102943620B Pressure-controlled drilling method based on drilling annulus wellbore multi-phase flow computing |
| 08/28/2013 | CN102913130B Full-hydraulic rock-drilling excavator using hydraulic excavator for production |
| 08/28/2013 | CN101280671B Concentric tube jet flow negative pressure sand washing apparatus and using method thereoof |
| 08/28/2013 | CA2769935A1 Method and system for cleaning fracture ports |
| 08/27/2013 | US8517692 Pressure limiting controller |
| 08/27/2013 | US8517122 Air/water separator and methods of use thereof |
| 08/27/2013 | US8517111 Systems and methods for circulating out a well bore influx in a dual gradient environment |