| 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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| 02/03/2011 | WO2010137986A3 Method and system for transferring signals through a drill pipe system |
| 02/02/2011 | EP2279047A1 Vibratory separator motion |
| 02/02/2011 | EP1910642B1 Apparatus and method to monitor slurries for waste re-injection |
| 02/02/2011 | CN201730569U Under-compacted arrow-shaped check valve |
| 02/02/2011 | CN201730568U Precipitation cylinder |
| 02/02/2011 | CN201730567U Small-displacement screw pump well flushing snubbing unit |
| 02/02/2011 | CN101965437A 流体分配系统 A fluid distribution system |
| 02/02/2011 | CN101965436A Shaker deck adjustment apparatus |
| 02/02/2011 | CN101963049A Underground motor bypass valve |
| 01/27/2011 | WO2008087281A3 Measuring system and method for a horizontal shaft |
| 01/27/2011 | US20110017446 Downhole Fluid Injection Dispersion Device |
| 01/26/2011 | EP2278114A2 Apparatus and methods for drilling a wellbore using casing |
| 01/26/2011 | EP2278113A2 Apparatus and methods for drilling a wellbore using casing |
| 01/26/2011 | EP2278112A2 Apparatus and methods for drilling a wellbore using casing |
| 01/26/2011 | EP2278111A2 Apparatus and methods for drilling a wellbore using casing |
| 01/26/2011 | EP2276954A2 Pressure control system |
| 01/26/2011 | EP2276905A2 On-the-fly acid blender with sampling equipment |
| 01/26/2011 | CN201723188U Cylindrical cone bottom pot well drilling solid control system adopting hydraulic jet stirring |
| 01/26/2011 | CN201723187U Drill bit impurity filter |
| 01/26/2011 | CN201723186U Water well cleaning device without backwater flow |
| 01/26/2011 | CN101956547A Wellsite surface equipment system |
| 01/25/2011 | US7874381 Pneumatic line deicing system |
| 01/25/2011 | US7874361 Methods and devices for forming a wellbore with casing |
| 01/25/2011 | CA2614579C Apparatus for warming entrained gases from recovered wellbore fluid samples |
| 01/25/2011 | CA2400467C A screen assembly, a support structure, a method of making same and a vibratory shaker |
| 01/20/2011 | WO2011009145A2 Tension-activated fluid bypass device |
| 01/20/2011 | WO2010128292A3 Downhole material delivery |
| 01/20/2011 | WO2010128291A3 Downhole tool |
| 01/20/2011 | WO2010128287A3 Downhole tool |
| 01/20/2011 | WO2009093069A3 Method and apparatus for facilitating continuous circulation of drilling mud during construction and maintenance of a well |
| 01/20/2011 | US20110011594 Mud Pulse Telemetry System |
| 01/19/2011 | EP2153015B1 Downhole flow control tool and method |
| 01/19/2011 | CN101952545A Method and system for fracturing subsurface formations during the drilling thereof |
| 01/19/2011 | CN101949271A Low-temperature vehicle-mounted oil drilling fluid purifying system during drilling and repairing |
| 01/19/2011 | CN101949270A High-pressure hydrocyclone sand washing device |
| 01/19/2011 | CN101250983B Single tube all-directional drilling injection slip-casting drilling bit capable of fluid-control starting and stopping auxiliary slip-casting hole |
| 01/13/2011 | WO2010129132A3 Portable polymer hydration-conditioning system |
| 01/13/2011 | WO2010120466A3 Slickline conveyed bottom hole assembly with tractor |
| 01/13/2011 | WO2010114741A3 Adjustable flow control devices for use in hydrocarbon production |
| 01/13/2011 | WO2010102232A3 Wellbore strengthening material recovery |
| 01/13/2011 | WO2010088681A4 System and method of monitoring flow in a wellbore |
| 01/13/2011 | US20110005835 Unequal Error Protection for Embedded Coding of Borehole Images and Variable-Quality Telemetry Channels |
| 01/13/2011 | US20110005834 Method to control bit load |
| 01/13/2011 | US20110005742 Fluid distribution system |
| 01/13/2011 | CA2853398A1 Downhole apparatus, device, assembly and method |
| 01/13/2011 | CA2766729A1 Downhole apparatus, device, assembly and method |
| 01/12/2011 | EP2129859B1 Distance holder with helical slot |
| 01/12/2011 | EP2097612B1 Method and apparatus for vacuum collecting and gravity depositing drill cuttings |
| 01/12/2011 | EP2089606B1 Device for drilling into rock material |
| 01/12/2011 | CN201705322U Downhole working condition simulating device for pressure control drilling experiments and tests |
| 01/12/2011 | CN201705251U Drilling fluid shale shaker |
| 01/12/2011 | CN201705250U Drilling fluid vibration sieve box with closed upper part |
| 01/12/2011 | CN201705249U Continuous jet blockage-removing string for horizontal wells |
| 01/12/2011 | CN201705201U Novel dustproof drilling machine with diamond thin-wall drill |
| 01/12/2011 | CN101942977A Continuous cyclic drilling device |
| 01/12/2011 | CN101942962A Well drilling method of through tubing of gas lift under-balanced coiled tubing |
| 01/11/2011 | US7866391 Shoe for wellbore lining tubing |
| 01/11/2011 | CA2588730C Apparatus and method for guiding pipe |
| 01/06/2011 | WO2011002682A2 Remotely controllable manifold |
| 01/06/2011 | WO2011002615A2 Flow control device with one or more retrievable elements |
| 01/06/2011 | US20110000713 System and method for drilling using drilling fluids |
| 01/06/2011 | CA2767109A1 Flow control device with one or more retrievable elements |
| 01/05/2011 | EP2268894A2 Flow restrictor |
| 01/05/2011 | EP2268891A2 Methods and systems of treating a wellbore |
| 01/05/2011 | EP2268890A2 Method and apparatus for programmable pressure drilling and programmable gradient drilling, and completion |
| 01/05/2011 | EP2268889A2 A collection device and method of using same |
| 01/05/2011 | CN101936142A Aerated underbalanced drilling method for coal-bed gas |
| 01/05/2011 | CN101148972B Electric percussion drilling device based on accumulator power supply |
| 01/04/2011 | US7861804 Sleeve arrangement |
| 01/04/2011 | US7861803 Auxiliary equipment for use with drilling apparatus |
| 01/04/2011 | CA2420732C A screen for a shale shaker |
| 12/30/2010 | US20100332204 Method of estimating well disposal capacity |
| 12/29/2010 | WO2010151729A1 Method of making pure salt from frac-water/wastewater |
| 12/29/2010 | EP1611311B1 System and method for treating drilling mud in oil and gas well drilling applications |
| 12/29/2010 | CN201687420U Rotary injection tool applicable to borehole operation in oil and gas field |
| 12/29/2010 | CN201687419U Installation device of ultrasonic probe |
| 12/29/2010 | CN101929331A Overall process under-balance drilling pressure compensation system and method |
| 12/29/2010 | CN101929316A Foam liquid well flushing process |
| 12/29/2010 | CN101929315A Well cleanup detecting device used for oil wells |
| 12/29/2010 | CN101929309A Gas lift reverse circulation drilling process |
| 12/29/2010 | CA2764755A1 Method of making pure salt from frac-water/wastewater |
| 12/28/2010 | US7857077 Method and apparatus for processing and injecting drill cuttings |
| 12/28/2010 | US7857067 Downhole application for a backpressure valve |
| 12/28/2010 | US7857058 Downhole swivel joint assembly and method of using said swivel joint assembly |
| 12/23/2010 | WO2010147919A2 Method and device for maintaining sub-cooled fluid to esp system |
| 12/23/2010 | WO2010147482A1 A method for disposal of drilling waste, contaminated sediments and residual waste and a disposal facility for same |
| 12/23/2010 | WO2010145004A1 Method and apparatus for sealing and venting pressurized casings of gas wells |
| 12/23/2010 | WO2010127107A3 Drill string flow control valves and methods |
| 12/23/2010 | US20100320000 Arrangement for processing dust |
| 12/23/2010 | US20100319995 Self-circulating drill bit |
| 12/23/2010 | CA2765752A1 Method and device for maintaining sub-cooled fluid to esp system |
| 12/23/2010 | CA2765495A1 A method for disposal of drilling waste, contaminated sediments and residual waste and a disposal facility for same |
| 12/22/2010 | EP2264121A1 Additive for oil-based drilling fluids |
| 12/22/2010 | EP2264120A1 Additive for oil-based drilling fluids |
| 12/22/2010 | EP2263106A2 Automated mud slowness estimation |
| 12/22/2010 | EP2262976A2 Fluid distribution system |
| 12/22/2010 | EP2262975A2 Shaker deck adjustment apparatus |
| 12/22/2010 | CN201679466U Oil well direct flushing device |
| 12/22/2010 | CN201679441U Drilling water faucet |
| 12/22/2010 | CN101925719A Breaker fluids and methods of using the same |