| 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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| 03/20/2013 | CN202810728U Rock debris negative pressure driving separating device |
| 03/20/2013 | CN202810727U Injecting dust-extraction unit with orifices connected in parallel |
| 03/20/2013 | CN202810726U Triangular drill rod dust extractor |
| 03/20/2013 | CN202810725U Pressing and expanding type multilateral well outer annulus scrap preventing device |
| 03/20/2013 | CN202810724U Shaft cuttings guard |
| 03/20/2013 | CN202810723U Drilling liquid solid-phase separation equipment |
| 03/20/2013 | CN202810722U Anti-dust device for hole drilling |
| 03/20/2013 | CN202810721U Drill machine water distinguishing device |
| 03/20/2013 | CN202810720U Cleaning instrument for cleaning high temperature oil base mud |
| 03/20/2013 | CN202810719U Drifting and sand washing device |
| 03/20/2013 | CN202810680U Well drilling combination device using double-wall drill pipe |
| 03/20/2013 | CN202810655U Casing pipe grouting tool |
| 03/20/2013 | CN202810644U Medium-wind pressure high-speed rock drill |
| 03/20/2013 | CN102979469A Secondary hole cleaning method for separating sediment of large-diameter ultra-deep punching pile by sucking slurry in inner air pipe |
| 03/20/2013 | CN102979468A Grouting system with metering device |
| 03/20/2013 | CN102979467A High density slurry |
| 03/20/2013 | CN102979466A Manufacturing method of dust exhaust hood |
| 03/20/2013 | CN101975041B Well cementing method for avoiding coal bed and device thereof |
| 03/20/2013 | CN101641491B Distance holder with helical slot |
| 03/19/2013 | CA2689719C Sand screw dryer |
| 03/19/2013 | CA2657513C A screen assembly for a vibratory separator |
| 03/14/2013 | WO2013036433A1 Drilling apparatus including a fluid bypass device and methods of using same |
| 03/14/2013 | WO2013036397A1 High temperature drilling with lower temperature rated tools |
| 03/14/2013 | WO2013009567A3 An apparatus, system and method for injecting a fluid into a formation downhole |
| 03/14/2013 | WO2012178041A3 Fluid migration shut-off |
| 03/14/2013 | US20130062122 High temperature drilling with lower temperature rated tools |
| 03/14/2013 | CA2847567A1 Auxiliary equipment for use with drilling apparatus |
| 03/13/2013 | CN202788830U Geological logging rock-debris collecting and cleaning device |
| 03/13/2013 | CN202788710U Integral drifting tool |
| 03/13/2013 | CN202788696U Tubular column nitrogen foam san washing flushing device |
| 03/13/2013 | CN202788695U Pressure and flow management system of shaft |
| 03/13/2013 | CN202788694U U-shaped pipe seawater cooling drilling fluid device |
| 03/13/2013 | CN202788693U Small junk ground capture device for circulation well flushing |
| 03/13/2013 | CN202788692U Drill dedusting device |
| 03/13/2013 | CN202788691U Drill cutting collecting device |
| 03/13/2013 | CN202788690U Operation solid-liquid separating recovering device |
| 03/13/2013 | CN202788689U Hermetic well flushing device of oil well |
| 03/13/2013 | CN202788688U Underground well leakage-proof sand washing device |
| 03/13/2013 | CN202788687U Recyclable washing device of oil well |
| 03/13/2013 | CN202788686U Tubular core modeled sand remover |
| 03/13/2013 | CN202788685U Oil well working fluid fast reversing device |
| 03/13/2013 | CN202788684U Oil-water well slush displacement device |
| 03/13/2013 | CN202788639U Detach-free manifold for normal or reverse circulation well flushing |
| 03/13/2013 | CN202788605U Driving shaft device of drilling machine rotary water supply |
| 03/13/2013 | CN102971482A Casing fill-up fluid management tool |
| 03/13/2013 | CN102966320A Extraction dust settling device of mine drilling machine |
| 03/13/2013 | CN102966304A Mud retaining wall and air down-the-hole hammer drilling tool and drilling technology |
| 03/12/2013 | US8393411 Method for controlling loss of drilling fluid |
| 03/12/2013 | US8393403 Drill string flow control valves and methods |
| 03/12/2013 | CA2670893C Enhanced oil-based foam drilling fluid compositions and method for making and using same |
| 03/07/2013 | WO2013033208A1 Trapped pressure compensator |
| 03/07/2013 | WO2013032687A2 Injection of fluid into selected ones of multiple zones with well tools selectively responsive to magnetic patterns |
| 03/07/2013 | WO2013032529A1 Controlled pressure pulser for coiled tubing applications |
| 03/07/2013 | WO2013032433A1 Downhole fluid flow control system and method having dynamic response to local well conditions |
| 03/07/2013 | WO2013030667A1 Vibratory screening apparatus |
| 03/07/2013 | WO2013029685A1 Arrangement for sand collection |
| 03/07/2013 | WO2012177460A3 Production system and method of varying restrictions to flow along the same |
| 03/07/2013 | WO2012173852A3 Tubular valving system, body and method of opening |
| 03/07/2013 | WO2012154336A3 Heat removal in drilling and production operations |
| 03/07/2013 | WO2012149345A9 Drilling waste treatment |
| 03/07/2013 | WO2012148578A4 Centrifugal subterranean debris collector |
| 03/07/2013 | WO2012127028A3 System and method for controlling the pressure in a hydrocarbon well |
| 03/07/2013 | CA2844960A1 Injection of fluid into selected ones of multiple zones with well tools selectively responsive to magnetic patterns |
| 03/07/2013 | CA2838164A1 Downhole fluid flow control system and method having dynamic response to local well conditions |
| 03/06/2013 | EP2564018A1 Liner hanger fluid diverter tool and related methods |
| 03/06/2013 | EP2564016A1 Wellbore pressure control with segregated fluid columns |
| 03/06/2013 | EP2563550A1 Device for a hydraulic hammer |
| 03/06/2013 | CN202768056U Safety interlock device for ensuring water supply operation of drill bit |
| 03/06/2013 | CN202767921U Novel screw rod drill bypass valve |
| 03/06/2013 | CN202767920U Mud return pipeline automatic control device for well drilling |
| 03/06/2013 | CN202767919U Mining drilling drainage and dust removal device |
| 03/06/2013 | CN202767918U Secondary hole-cleaning device of cast-in-place pile |
| 03/06/2013 | CN102953708A Bypass short joint capable of being activated and circulated repeatedly |
| 03/06/2013 | CN102953706A Washable well packer for realizing underground secondary setting |
| 03/06/2013 | CN102953697A Filtrate separator |
| 03/06/2013 | CN102953696A Downhole supercharging device |
| 03/06/2013 | CN102953676A Drill power system |
| 03/06/2013 | CN102031934B Drill rod water feeder |
| 03/06/2013 | CN101291746B Shale shaker |
| 03/06/2013 | CN101109276B Rock bolt |
| 03/05/2013 | US8387723 Drilling fluid and method for drilling in coal-containing formations |
| 02/28/2013 | WO2013028335A2 Downhole fluid flow control system having a fluidic module with a bridge network and method for use of same |
| 02/28/2013 | WO2013026256A1 Downhole pressurization device |
| 02/28/2013 | US20130048385 Dust Binding Device and Method |
| 02/28/2013 | US20130048379 Controlled Full Flow Pressure Pulser for Measurement While Drilling (MWD) Device |
| 02/28/2013 | US20130048276 Frac water blending system |
| 02/28/2013 | CA2844246A1 Downhole fluid flow control system having a fluidic module with a bridge network and method for use of same |
| 02/27/2013 | EP2562349A2 Methods and systems for drilling |
| 02/27/2013 | EP2562310A1 Submarine drilling assembly and method for producing a borehole in a sea floor |
| 02/27/2013 | EP2561174A1 Method and composition for treating fluids before injection into subterranean zones |
| 02/27/2013 | CN202756009U Mining drilling dust removal and gas drainage device |
| 02/27/2013 | CN202755929U Shock rotation reverse circulation drilling machine faucet |
| 02/27/2013 | CN202755928U Valve core special for positive displacement motor bypass-valve |
| 02/27/2013 | CN202755927U Well drilling device using flow monitoring to control bottom hole pressure |
| 02/27/2013 | CN202755926U Spin-drying and processing device for oily drilling cuttings |
| 02/27/2013 | CN202755925U Mud blending system with mud performance parameters intelligent detection function |
| 02/27/2013 | CN202755924U Drilling fluid filling device |
| 02/27/2013 | CN202755890U Walking type double circling downhole drill |
| 02/27/2013 | CN102947541A Method and apparatus for increasing the yield of a deposit |
| 02/27/2013 | CN102943640A Defoaming device and defoaming method for removing foam of drilling fluid by means of linkage of negative pressure and thermal radiation |