| 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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| 04/11/2013 | WO2013019523A3 Method and system for sampling multi-phase fluid at a production wellsite |
| 04/11/2013 | WO2013009694A3 Downhole polymer foam applications |
| 04/11/2013 | US20130087389 Fluid Partition Unit |
| 04/11/2013 | US20130087388 Wellbore influx detection with drill string distributed measurements |
| 04/11/2013 | US20130087338 Wellbore operations using controlled variable density fluid |
| 04/11/2013 | CA2851137A1 Fluid containment and management system |
| 04/10/2013 | EP2576958A1 Large bore auto-fill float equipment |
| 04/10/2013 | EP2576957A2 System and method for passing matter in a flow passage |
| 04/10/2013 | EP2576956A2 Method for circulating a fluid entry entry out of a subsurface wellbore without shutting in the wellbore |
| 04/10/2013 | CN202866740U Discharge type well flushing packer |
| 04/10/2013 | CN202866699U Vehicle-mounted well washing monitoring device |
| 04/10/2013 | CN202866698U Mechanical foam breaker for oil-gas well foam drilling |
| 04/10/2013 | CN202866697U Novel horizontal well mud cake washing device |
| 04/10/2013 | CN202866696U Block-clearing device |
| 04/10/2013 | CN202866695U Multifunctional inverse well-flushing device |
| 04/10/2013 | CN103038439A Method for in situ fluid assessment and optimization during wellbore displacement operations |
| 04/10/2013 | CN103032040A Continuous cycle short circuit suitable for air drilling |
| 04/10/2013 | CN103032039A Pre-filling sand prevention method of highly-deviated well casing pipe and dedicated sand-filter pipe thereof |
| 04/10/2013 | CN102305021B Experimental method for simulating dynamic mechanics characteristic of underground drilling rig of air well drilling |
| 04/10/2013 | CN101793131B Drilling and grinding tubular column structure of two-stage shunting screw drill |
| 04/09/2013 | US8413745 Water-based mud lubricant using fatty acid polyamine salts and fatty acid esters |
| 04/09/2013 | US8413721 Viscosified fluids for remediating subterranean damage |
| 04/09/2013 | CA2706006C Apparatus and method for processing solids laden fluid in the drilling and maintenance of oil and gas wells |
| 04/04/2013 | WO2013044349A1 Hydrophobic screens for enhanced drill fluid handling and methods of use |
| 04/04/2013 | WO2013015992A3 Selective hydraulic fracturing tool and method thereof |
| 04/04/2013 | WO2012166400A3 Wellbore junction completion with fluid loss control |
| 04/04/2013 | WO2012027276A3 Pump through circulating and or safety circulating valve |
| 04/03/2013 | CN202850930U Overflow automatic control device for drilling |
| 04/03/2013 | CN202850928U Mud spray-proof box |
| 04/03/2013 | CN202850904U Core drilling machine with dust discharge device |
| 04/03/2013 | CN202850903U Underground fluid controlling valve |
| 04/03/2013 | CN202850902U Underground turbine generator closed loop controlling system |
| 04/03/2013 | CN202850901U Conveying unit for mud of cluster well solid control system |
| 04/03/2013 | CN202850900U Downhole tool integrating operations of detection, washing and fishing of oil well |
| 04/03/2013 | CN202850899U Movable electrical heating well washing device |
| 04/03/2013 | CN103025993A 钻管 Drill pipe |
| 04/03/2013 | CN103016044A Comprehensive method of drilling, permeability increasing, repairing and gas-driven displacing of drill hole underground coal mine |
| 04/03/2013 | CN103015973A Simulation device for obtaining drilling parameter in pressure-controllable drilling |
| 04/03/2013 | CN103015967A Method of controlling direction of toolface of bottom hole assembly for slide drilling |
| 04/03/2013 | CN103015933A Sand washing and sand salving integrated tubular column and method for oil well |
| 04/03/2013 | CN103015927A Method for optimizing and recycling waste drilling fluid |
| 04/03/2013 | CN103015926A Impact drill with dust collector |
| 04/03/2013 | CN103015925A Intelligent drill rig solid control system |
| 04/03/2013 | CN103015924A Full-automatic drill cutting cleaning machine and cleaning method thereof |
| 04/03/2013 | CN103015923A Special vibrating sieve for oil drilling fluid |
| 04/03/2013 | CN103015891A Movable roof expansion bolt punching device |
| 04/03/2013 | CN102155196B Dynamic laser perforation device capable of penetrating into rock under petroleum well |
| 04/03/2013 | CN101949271B Low-temperature vehicle-mounted oil drilling fluid purifying system during drilling and repairing |
| 04/02/2013 | US8408337 Downhole blowout preventor |
| 04/02/2013 | US8408331 Downhole downlinking system employing a differential pressure transducer |
| 04/02/2013 | US8408307 Wellbore cleaning method and apparatus |
| 03/28/2013 | WO2013044038A1 System and method of clarifying drilling mud and hydrophilic liquid or solution for use in clarifying drilling mud |
| 03/28/2013 | WO2013043358A1 Self cleaning high pressure abrasive slurry/fluid check valve |
| 03/28/2013 | WO2013040678A1 Three-phase separation system for drilling fluids and drill cuttings |
| 03/28/2013 | WO2013019522A3 System and method for sampling multiphase fluid at a production wellsite |
| 03/28/2013 | WO2012170577A3 Method and apparatus for handling oil and gas well drilling fluids |
| 03/28/2013 | WO2012167170A3 Lubricated soil mixing systems and methods |
| 03/28/2013 | US20130075158 Methods and Apparatus to Determine Slowness of Drilling Fluid in an Annulus |
| 03/28/2013 | DE102011115174A1 Degassing apparatus useful for degassing liquid-gas-mixture extracted from subsoil, preferably rock layers, comprises degassing container, supply line, container outlet, discharge line, and feeding device arranged with discharge line |
| 03/28/2013 | CA2849727A1 System and method of clarifying drilling mud and a hydrophilic liquid or solution for use in clarifying drilling mud |
| 03/28/2013 | CA2847958A1 Three-phase separation system for drilling fluids and drill cuttings |
| 03/27/2013 | EP2572072A2 Method for drilling through nuisance hydrocarbon bearing formations |
| 03/27/2013 | CN202832436U Directional well separate zone water injection ball-and-seat |
| 03/27/2013 | CN202832418U Screen pipe completion system |
| 03/27/2013 | CN202832322U Circulatory sliding sleeve |
| 03/27/2013 | CN202832321U Hollow rod pillar one-way valve |
| 03/27/2013 | CN202832320U Stone powder pot exhausting purification device |
| 03/27/2013 | CN202832319U Drilling fluid solid control system |
| 03/27/2013 | CN202832318U Rock debris processing system used for well drilling |
| 03/27/2013 | CN202832317U Solid control system for petroleum drilling |
| 03/27/2013 | CN202832316U Cuttings bed remover |
| 03/27/2013 | CN202832315U Sand washing pump |
| 03/27/2013 | CN202832314U Novel well flushing device |
| 03/27/2013 | CN202832313U Novel oil pipe drill-through washing device |
| 03/27/2013 | CN202832312U Two-vehicle installing pressure unrelief well washing vehicle |
| 03/27/2013 | CN202832245U Triangular hollow steel pipe |
| 03/27/2013 | CN202832186U Auto-oscillation type hydraulic two-channel reverse circulation power head |
| 03/27/2013 | CN103003516A Method for drilling through nuisance hydrocarbon bearing formations |
| 03/27/2013 | CN102996160A Safety protection device and method for slotting to increase permeability by water jet |
| 03/27/2013 | CN102996088A Collector provided with dynamic and static combination sealing structure |
| 03/27/2013 | CN102996087A Dustproof device and electric hand drill |
| 03/27/2013 | CN102996086A Trailer slush pump unit device |
| 03/27/2013 | CN102996078A Dustproof rock drilling machine |
| 03/27/2013 | CN102996072A Multifunctional cutting drilling machine |
| 03/27/2013 | CN102230363B Device and method for drilling and forming hole in coal rock in structural belt |
| 03/27/2013 | CN101218041B Molded end cap for oilfield screens |
| 03/26/2013 | US8403078 Methods and apparatus for wellbore construction and completion |
| 03/26/2013 | US8403059 External jet pump for dual gradient drilling |
| 03/26/2013 | CA2674350C Method and apparatus for retrieving an assembly from a wellbore |
| 03/21/2013 | WO2013039721A1 Accumulator having operating fluid volume independent of external hydrostatic pressure |
| 03/21/2013 | WO2013039663A2 Magnetically coupled safety valve with satellite inner magnets |
| 03/21/2013 | WO2013039575A1 Methods and systems for circulating fluid within the annulus of a flexible pipe riser |
| 03/21/2013 | WO2012149004A3 Method of making and using a functionally gradient composite tool |
| 03/21/2013 | US20130068530 System and method of clarifying drilling mud and a hydrophilic liquid or solution for use in clarifying drilling mud |
| 03/21/2013 | US20130068477 Apparatus and method for facilitating the connection of tubulars using a top drive |
| 03/21/2013 | CA2848708A1 Methods and systems for circulating fluid within the annulus of a flexible pipe riser |
| 03/21/2013 | CA2848452A1 Methods, systems and apparatus for circulating fluid within the annulus of a flexible pipe riser |
| 03/20/2013 | CN202810776U High pressure expanding type well-flushing packer |
| 03/20/2013 | CN202810730U Down-hole drilling centralized control atomization airflow fireproofing dust-reduction device |
| 03/20/2013 | CN202810729U Multi-configuration instruction down-transmission device |