| 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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| 12/04/2013 | EP2667979A2 Screen assembly and a method for making same |
| 12/04/2013 | CN203321425U Retractile packer capable of unpacking step by step |
| 12/04/2013 | CN203321424U Backwashing well water injection packer |
| 12/04/2013 | CN203321386U Well flushing paraffin valve utilizing hollow sucker rod |
| 12/04/2013 | CN203321385U Automatic separator for rock powder in mud |
| 12/04/2013 | CN203321384U Coiled tubing rotating sand washing mill nozzle |
| 12/04/2013 | CN203321383U Ejecting flow negative-pressure spraying dust collection device |
| 12/04/2013 | CN203321382U Backwashing sealing device |
| 12/04/2013 | CN203321381U Extensible type drilling fluid circulation tee |
| 12/04/2013 | CN203321327U Ice layer air rapid drilling reverse circulation continuous coring drill bit |
| 12/04/2013 | CN203321324U Underground coal mine seam drilling and cavitating device |
| 12/04/2013 | CN203321319U Drilling machine |
| 12/04/2013 | CN203315805U Mud and gas separator |
| 12/04/2013 | CN103422823A Cleaning fiber and method for using cleaning fiber for cleaning well |
| 12/04/2013 | CN103422814A Three-dimensional waterpower vibrator for petroleum drilling |
| 12/04/2013 | CN102162342B Communicating vessel-type qualitative monitoring method for well kick and lost circulation |
| 12/04/2013 | CA2817651A1 Drilling fluids useful for limiting tar sand accretion |
| 12/04/2013 | CA2779190A1 Drilling fluids useful for limiting tar sand accretion |
| 12/03/2013 | CA2737406C Method and apparatus for separating solids from solids laden drilling fluid |
| 11/29/2013 | CA2817322A1 Process for separation and recovery of cuttings, emulsion and slurry components |
| 11/28/2013 | WO2013176995A1 A method and apparatus for automatically testing high pressure and high temperature sedimentation of slurries |
| 11/27/2013 | EP2665894A2 Telemetry operated circulation sub |
| 11/27/2013 | CN203308409U Voltage-control type pump-passing forward-washing valve |
| 11/27/2013 | CN203308408U Backwashing system of wellhead sump oil and sewage collection re-injection device |
| 11/27/2013 | CN203308407U Solid and liquid admixture separation all-in-one machine |
| 11/27/2013 | CN203308406U Improved type oil well hollow rod well flushing device |
| 11/27/2013 | CN103415672A Method for continuous formation core sampling |
| 11/27/2013 | CN103410462A Hollow-rod well washing check valve |
| 11/27/2013 | CN103410461A Three-proof device in drilling process |
| 11/27/2013 | CN103410443A Well drilling method and device combining heat energy and mechanical energy |
| 11/26/2013 | US8594818 Production monitoring system and method |
| 11/26/2013 | US8590640 Apparatus and method to maintain constant fluid circulation during drilling |
| 11/26/2013 | US8590639 Articulated pre-skimmer mount |
| 11/26/2013 | CA2755939C Aerated degasser |
| 11/21/2013 | WO2013173785A1 Eccentric adjustment coupling for mud motors |
| 11/21/2013 | WO2013173268A1 System and method for identifying a ballooning zone |
| 11/21/2013 | US20130311096 Application of engineering principles in measurement of formation gases for the purpose of acquiring more consistent, standardized and authentic gas values for surface logging while drilling |
| 11/21/2013 | DE102012010199A1 Method for forming tubular borehole in ground, involves exhausting rising fluid from borehole through annular space and discharging exhausted rising fluid by ejection head, where annular space is formed between drill pipe and standpipe |
| 11/20/2013 | EP2663728A2 Gravity based fluid trap |
| 11/20/2013 | EP2205817B1 Anchored riserless mud return systems |
| 11/20/2013 | CN203296799U Whole-sealing-type dust removing and collecting integrated device used in drilling and deslagging achieved by wind in mine |
| 11/20/2013 | CN203296725U Through type DTH hammer reverse circulation drilling dust collecting device |
| 11/20/2013 | CN203296724U Well drilling slurry return tank with cleaning pipeline |
| 11/20/2013 | CN203296723U Gravity type slurry separation system |
| 11/20/2013 | CN203296676U Combined down-hole hammer drilling tool |
| 11/20/2013 | CN103403288A Method, system and rock drilling apparatus for installing a pipe in drilled holes in rock drilling |
| 11/20/2013 | CN103397860A Slurry distribution remote controller |
| 11/20/2013 | CN103397859A Integrated drilling and draining floor anchor driller |
| 11/20/2013 | CN103397858A Drainage and production combined sand washing machine for coal bed gas and method for applying drainage and production combined sand washing machine |
| 11/20/2013 | CN103397847A Rapid ice layer air drilling reverse-circulation continuous coring drill bit |
| 11/20/2013 | CN102128047B Gas-slag separation and recovering system for drilling construction |
| 11/19/2013 | CA2742623C Pressure and flow control in drilling operations |
| 11/19/2013 | CA2701730C Screen clamp |
| 11/14/2013 | WO2013170166A1 Variable geometry fracture sealing tester |
| 11/14/2013 | WO2013170137A2 Control panel, and digital display units and sensors therefor |
| 11/14/2013 | WO2013169256A1 Prediction and diagnosis of lost circulation in wells |
| 11/14/2013 | WO2013169234A1 Downhole fluid flow control system and method having autonomous closure |
| 11/14/2013 | WO2012120259A3 Plug and pump system for routing pressurized fluid |
| 11/14/2013 | US20130300568 Control panel, and digital display units and sensors therefor |
| 11/14/2013 | US20130299240 Drilling apparatus |
| 11/14/2013 | US20130299191 Long thin structures for generating an entangled flow restricting structure |
| 11/14/2013 | US20130299175 Downhole vacuum sub |
| 11/14/2013 | US20130299164 Systems and Methods For Advanced Well Access to Subterranean Formations |
| 11/13/2013 | CN203285377U Spring tube gas-dust-removal hole sealing device |
| 11/13/2013 | CN203285371U Drilling fluid circulation system for nitrogen foam drilling |
| 11/13/2013 | CN203285370U Single-section throttling channel pressure control drilling device adapted to large flow variation |
| 11/13/2013 | CN203285369U Collecting groove for petroleum drilling and production device |
| 11/13/2013 | CN203285368U Wellhead return pressure control system for managed pressure drilling |
| 11/13/2013 | CN103388466A Concentric pipe hydraulic jet coal dust washing downhole device |
| 11/13/2013 | CN103388465A Downhole device using hydraulic jets of parallel tubes to flush pulverized coal |
| 11/13/2013 | CN103388464A Concentric double pipe column reverse circulation continuous coal dust washing system well head device |
| 11/13/2013 | CN101238272B Apparatus and methods for creation of down hole annular barrier |
| 11/12/2013 | CA2731840C System and method for blending a dry material with a fluid in a closed environment |
| 11/08/2013 | CA2815042A1 Electro-separation of oil-based drilling fluids |
| 11/07/2013 | WO2013166392A1 Method and apparatus to control water migration into electrical submersible pump motors |
| 11/07/2013 | WO2013165745A1 Adjustable pressure hydrostatic setting module |
| 11/07/2013 | WO2013164478A2 Method of drilling a subterranean borehole |
| 11/07/2013 | WO2013134037A3 A method and apparatus for mixing, transporting, storing, and transferring thixotropic fluids in one container |
| 11/07/2013 | WO2012140446A3 Drilling apparatus and method |
| 11/06/2013 | EP2660420A1 Improved equipment adapted for dissolution of polymer in fracturing operations |
| 11/06/2013 | CN203271701U Tubular column pressing no oil layer during well washing |
| 11/06/2013 | CN203271698U Pump powered strong magnetic cyclone self-power-generating hot washing truck |
| 11/06/2013 | CN203271681U Three-axis drilling machine |
| 11/06/2013 | CN203271644U Negative pressure drilling system for preventing transfinite gas |
| 11/06/2013 | CN203271643U Pile bottom cleaning machine |
| 11/06/2013 | CN203271642U Underground coal mine drill hole opening dust catching device |
| 11/06/2013 | CN203271641U Guide dust-eliminating device for drill hole |
| 11/06/2013 | CN203271640U Intelligent drilling machine solid control system |
| 11/06/2013 | CN203271639U Gas content spot sampling device |
| 11/06/2013 | CN103382824A Auxiliary pressurizing device for drainage of kilometer drill rig |
| 11/06/2013 | CN103382823A Drilling head separating floor anchoring drill |
| 11/06/2013 | CN103382822A Small-pipe-diameter grouting device capable of accurately metering displacement |
| 11/06/2013 | CN102561947B Vibroflotation lead hole construction method based on pneumatic drill slag stirring |
| 11/06/2013 | CN102322232B Borehole sand-washing string and sand-washing method |
| 11/06/2013 | CN102168545B Coiled tubing supercritical CO2 jet fracturing method |
| 11/06/2013 | CN101978372B Method of estimating well disposal capacity |
| 11/06/2013 | CN101718178B Method for continuously washing coal ash under coal bed methane well in bride type without causing pollution |
| 10/31/2013 | WO2013163642A1 Wellbore annular pressure control system and method using gas lift in drilling fluid return line |
| 10/31/2013 | WO2013163191A1 Continuous gravity feed system for feeding additives to a drilling mud system |
| 10/31/2013 | WO2013162558A1 Downhole circulating valve having a seal plug and method for operating same |