| 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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| 03/30/2011 | CN101995431A Mechanical system of magnetic leakage detector for wellhead drill stem of drilling machine |
| 03/30/2011 | CN101994503A Production increasing method of coalbed gas |
| 03/30/2011 | CN101994494A Split dynamic depressurization device for oil gas well |
| 03/30/2011 | CN101994493A Compound perforation dynamic depressurization device for oil gas well |
| 03/30/2011 | CN101994492A Annular space type foam drilling mechanical defoamer |
| 03/30/2011 | CN101994484A Wind-water dual-purpose inserted outburst-prevention drill rod |
| 03/30/2011 | CN101275458B Reverse circulation construction technique and apparatus of single rope impact drill |
| 03/30/2011 | CA2680895A1 Flow pulsing device for a drilling motor |
| 03/29/2011 | US7913776 Method and system to recover usable oil-based drilling muds from used and unacceptable oil-based drilling muds |
| 03/29/2011 | US7913763 Washing a cylindrical cavity |
| 03/24/2011 | WO2011035251A2 Open-hole mudcake cleanup |
| 03/24/2011 | WO2011034694A2 Fracturing and gravel packing tool with shifting ability between squeeze and circulate while supporting an inner string assembly in a single position |
| 03/24/2011 | WO2011033001A1 Method of drilling a subterranean borehole |
| 03/24/2011 | WO2010106124A3 Method and device for drilling shafts in ground layers consisting of rock, clay and/or related materials |
| 03/24/2011 | US20110067877 Open-hole mudcake cleanup |
| 03/24/2011 | CA2770934A1 Method of drilling a subterranean borehole |
| 03/23/2011 | EP2297428A1 Method of remediating bit balling using oxidizing agents |
| 03/23/2011 | EP2094933B1 Device for percussion drilling or rotary percussion drilling in rocky material |
| 03/23/2011 | CN201771453U Repetition positive well cleanout valve |
| 03/22/2011 | US7909585 Natural gas compressor and a system for operating the same |
| 03/22/2011 | US7909107 High capacity running tool and method of setting a packoff seal |
| 03/22/2011 | CA2645943C Silicate drilling fluid composition containing lubricating agents and uses thereof |
| 03/22/2011 | CA2597887C System and method for well intervention |
| 03/22/2011 | CA2564357C Apparatus and method for modified horizontal directional drilling assembly |
| 03/22/2011 | CA2508852C Drilling method |
| 03/17/2011 | WO2011031836A2 Systems and methods for circulating out a well bore influx in a dual gradient environment |
| 03/17/2011 | CA2773188A1 Systems and methods for circulating out a well bore influx in a dual gradient environment |
| 03/16/2011 | EP2295712A2 Rotating control device for drilling wells |
| 03/16/2011 | CN201763302U Auxiliary circulating and chip-returning device of discharge and mining vertical well used during radial hydraulic jetting of coal bed methane well |
| 03/16/2011 | CN201763285U Power hydrant |
| 03/16/2011 | CN201763284U Separated type drilling fluid double deck screen mesh |
| 03/16/2011 | CN101250984B Well-washing sand prevention integrated technique tubular pile |
| 03/15/2011 | US7906462 Mutual solvent system and method for improved oil and gas permeability in high temperature formations |
| 03/15/2011 | US7906461 Thermally stable compositions and use thereof in drilling fluids |
| 03/15/2011 | CA2609500C Transfer of finely ground weight material |
| 03/10/2011 | WO2011028562A2 Isolation valve for subterranean use |
| 03/10/2011 | US20110056749 Arrangement and a method for monitoring an air flow in a drill rig |
| 03/09/2011 | EP2292891A2 Method to inject a slurry into a subterranean formation |
| 03/09/2011 | EP2292716A1 Compositions for drilling fluids useful to provide flat temperature rheology to such fluids over a wide temperature range and drilling fluids containing such compositions |
| 03/09/2011 | EP1735520B1 Improvements in or relating to rock drilling equipment |
| 03/09/2011 | CN201756949U Multifunctional scraping and washing device for pumping well |
| 03/08/2011 | CA2499759C Reverse circulation directional and horizontal drilling using concentric drill string |
| 03/03/2011 | WO2010129888A3 Dual action jet bushing |
| 03/03/2011 | US20110048802 Method and Apparatus for Controlling Bottomhole Temperature in Deviated Wells |
| 03/03/2011 | DE10258963B4 Vorrichtung zum Spülbohren von Bohrlöchern in Böden Apparatus for directional drilling of wells in soils |
| 03/02/2011 | EP2290192A1 Apparatus and method for autofill equipment activation |
| 03/02/2011 | EP2032795B1 Device for channeling solids and fluids within a reverse circulation drill |
| 03/02/2011 | CN201753589U Anti-backflow device used in aerated under-balanced drilling process |
| 03/01/2011 | US7896080 Method of improving hydrocarbon production from a gravel packed oil and gas well |
| 02/24/2011 | WO2011022324A2 Method for determining formation fluid control events in a borehole using a dynamic annular pressure control system |
| 02/24/2011 | WO2011022323A2 Self aligning mud saver valve seat |
| 02/24/2011 | WO2011022284A2 Sliding sleeve locking mechanisms |
| 02/24/2011 | WO2011022211A2 Alternating flow resistance increases and decreases for propagating pressure pulses in a subterranean well |
| 02/24/2011 | WO2011020979A1 Flow stop valve |
| 02/24/2011 | WO2011020978A1 Apparatus for downhole power generation |
| 02/24/2011 | WO2011020196A1 An apparatus and method for containing fluid or gas released from a pipe |
| 02/24/2011 | WO2010133304A3 System and method for facilitating well servicing operations |
| 02/24/2011 | WO2010112933A3 Drill pipe connector |
| 02/24/2011 | WO2009070519A3 Pressure compensation and rotary seal system for measurement while drilling instrument |
| 02/24/2011 | US20110042141 Remediation of Relative Permeability Blocking Using Electro-osmosis |
| 02/24/2011 | US20110042089 Openhole perforating |
| 02/24/2011 | DE112008003203T5 Druckkompensations- und Drehdichtungssystem für ein Instrument zur Messung während des Bohrens Druckkompensations- and rotary seal system for an instrument for measuring while drilling |
| 02/24/2011 | CA2771350A1 Self aligning mud saver valve seat |
| 02/24/2011 | CA2771095A1 Flow stop valve |
| 02/23/2011 | CN201751530U Drilling fluid vibrating screen |
| 02/23/2011 | CN101979827A Method for supporting horizontal section wellbore for coal bed gas horizontal well |
| 02/22/2011 | CA2513395C Improved downhole apparatus |
| 02/17/2011 | WO2011019645A2 Permanent magnet linear motor actuated safety valve and method |
| 02/17/2011 | WO2011019469A2 Systems and methods for running casing into wells drilled with dual-gradient mud systems |
| 02/17/2011 | US20110036785 Waste solid cleaning apparatus |
| 02/17/2011 | US20110036635 Hydrovac with Blower in Tank |
| 02/17/2011 | US20110036633 Method and Apparatus for Efficient Handling of Drill Cuttings |
| 02/17/2011 | DE20222014U1 Vorrichtung zum Spülbohren von Bohrlöchern in Böden Apparatus for directional drilling of wells in soils |
| 02/17/2011 | CA2768756A1 System and method for servicing a wellbore |
| 02/16/2011 | CN201747349U Digital controlling apparatus for water injection rate |
| 02/16/2011 | CN201747307U Automatic connecting drill rod slurry interceptor |
| 02/16/2011 | CN201747306U High temperature and high voltage slurry dehydration instrument |
| 02/16/2011 | CN201747305U Three-way mud manifold |
| 02/16/2011 | CN101978372A Method of estimating well disposal capacity |
| 02/16/2011 | CN101975041A Well cementing method around coal bed and device thereof |
| 02/16/2011 | CN101975037A Method and device for conversing direct and reverse circulations of workover fluid in oil well |
| 02/16/2011 | CN101975022A Post-positioned jumbolter of impact mechanism |
| 02/15/2011 | US7886850 Drilling fluid screening systems |
| 02/15/2011 | US7886848 Method and apparatus for disposal of cuttings |
| 02/10/2011 | WO2011017424A2 Tubular system with selectively engagable sleeves and method |
| 02/10/2011 | WO2011017105A2 Wellbore cleanout tool |
| 02/10/2011 | WO2010147919A3 Method and device for maintaining sub-cooled fluid to esp system |
| 02/10/2011 | CA2769479A1 Wellbore cleanout tool |
| 02/09/2011 | EP2281999A2 BOP and separator combination |
| 02/09/2011 | EP2281103A1 Systems and methods for subsea drilling |
| 02/09/2011 | CN201738848U Wellbore cleaning tool used in well drilling |
| 02/09/2011 | CN201738825U Coaxial head swinging mud pipe device |
| 02/09/2011 | CN201735242U Desanding machine |
| 02/09/2011 | CN101970793A Methods and systems of treating a wellbore |
| 02/09/2011 | CN101967962A Horizontal well sand washing device |
| 02/09/2011 | CN101220733B Foam pre-evolution liquid device |
| 02/08/2011 | US7882903 Cuttings bed removal tool |
| 02/08/2011 | CA2522035C Multi seam coal bed/methane dewatering and depressurizing production system |
| 02/03/2011 | WO2011011878A1 Drilling fluid additive comprising an oil and multiple guar compounds |
| 02/03/2011 | WO2011011817A1 Drill apparatus |