| Patents for E21F 7 - Methods or devices for drawing-off gases with or without subsequent use of the gas for any purpose (2,187) |
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| 01/22/2014 | CN203403904U Mine air conditioner device capable of recycling methane |
| 01/22/2014 | CN203403856U Outer-injection type gas drainage and coal seam water injection hole packer |
| 01/22/2014 | CN103527245A Drainage device used for gas pumping and releasing pipeline |
| 01/22/2014 | CN103527242A United under pressure gas drainage hole sealing method and applied double-layer expansion rubber pipes thereof |
| 01/22/2014 | CN103527241A Hole sealing device |
| 01/22/2014 | CN103527096A Mining drilling and cutting integrated drill bit |
| 01/22/2014 | CN102146803B Collection and utilization system outside coal mine gas well |
| 01/15/2014 | CN203394572U Liquid state and gas state pressurizing type gas hole packer |
| 01/15/2014 | CN203394571U Pneumatic negative-pressure automatic residue discharge and water drain machine |
| 01/15/2014 | CN203394430U Grouting hole packer |
| 01/15/2014 | CN203394426U Continuous pressurized hole drilling and hole sealing device |
| 01/15/2014 | CN103510979A Dry ice explosion and air-permeability-enhancing device and method for drawing out gas by using same |
| 01/15/2014 | CN103510978A Combined oxidation bed for coal mine ventilation air preheating catalytic oxidation device |
| 01/15/2014 | CN103510977A Combined type oxidation bed of coal mine ventilation air methane reversal flow catalytic oxidation device |
| 01/15/2014 | CN103510958A Gentle dip super-high seam rock cross-cut coal uncovering method |
| 01/15/2014 | CN103510936A Double-ejector type three-phase jet flow slotting system and method |
| 01/08/2014 | CN203384384U Gas pipeline system of drainage-mine old pond and control valve applied to gas pipeline system |
| 01/08/2014 | CN102434193B Gas-water-slag separator for gas drainage |
| 01/01/2014 | CN203374303U Negative pressure water releasing device |
| 01/01/2014 | CN103485821A Automatic water discharging device of coal-mine gas extraction pipeline |
| 01/01/2014 | CN103485773A Method for determining multi-branch horizontal well branch parameters |
| 01/01/2014 | CN103485747A Automatic pressure-adding borehole sealing device and method |
| 01/01/2014 | CN103485721A High-low-pressure hydraulic hole flushing switcher |
| 12/26/2013 | US20130340997 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 12/25/2013 | CN203362441U Associated gas recycling compressor |
| 12/25/2013 | CN203362215U Rapidly clamped type deslagging device |
| 12/25/2013 | CN203362135U Perforating device improving gas permeability of coal beds |
| 12/25/2013 | CN103470305A System and method for preventing and controlling potential hazards in gas extraction |
| 12/25/2013 | CN103470299A Dewatering device used for negative-pressure gas extraction pipeline |
| 12/25/2013 | CN103470298A Design method of hole-drilling and hole-forming process scheme for drainage of outburst coal seam |
| 12/25/2013 | CN103470297A Drilling, pumping and discharging integrated coal seam pressure relief and permeability improvement device and using method thereof |
| 12/25/2013 | CN103470186A Drill bit for coal-mine gas extraction hole |
| 12/25/2013 | CN103470182A Dual rotating seal of gas and water |
| 12/25/2013 | CN102587961B Feeding method for hole protecting pipe for soft coal seam gas extraction hole |
| 12/25/2013 | CN102287217B Hydraulic seam cutting porous slag discharge method |
| 12/25/2013 | CN102155256B Method for preventing gas extraction hole from collapsing |
| 12/18/2013 | CN203347834U Hole packer |
| 12/18/2013 | CN203347833U Gas drainage pipe negative pressure automatic slag-discharge water-drainage device |
| 12/18/2013 | CN203347685U Double-rotation and double-lifting airborne drilling machine |
| 12/18/2013 | CN103452580A Double-barrel anti-backfire device |
| 12/18/2013 | CN103452579A Negative pressure drainer and gas drainage pipeline |
| 12/18/2013 | CN103452525A Gas pumping fixing occluder and use method thereof |
| 12/18/2013 | CN103452522A Gas pumping sleeve-penetrating occluder and use method thereof |
| 12/18/2013 | CN103452519A Double-bag sealing device for gas drainage holes |
| 12/18/2013 | CN102635394B Gas, water and coal separation device of coal-mine gas spray hole |
| 12/18/2013 | CN102635390B Method, device and simulation experiment system for simulating gas pressure propagation during process of drainage production of coal-bed gas well |
| 12/12/2013 | WO2013181706A1 A mesh and method for making the mesh |
| 12/11/2013 | CN203336070U Bi-metal composite gas drainage pipeline with coating |
| 12/11/2013 | CN203335122U Internally-arranged drill rod temperature-control automatic air closing inflaming-retarding device |
| 12/11/2013 | CN203335017U Long-distance under-pressure hole sealing structure for gas extraction drill hole |
| 12/11/2013 | CN203335015U Gas drainage coal seam water injection air-bag type hole sealing device |
| 12/11/2013 | CN103438284A Reinforced gas drainage pipe |
| 12/11/2013 | CN103437811A Purifying and deslagging device and gas drainage pipeline |
| 12/11/2013 | CN103437810A Method for preparing liquid utilizing liquid nitrogen to dissolve gas and using method |
| 12/11/2013 | CN103437809A Method for preparing coal mine gas eliminating liquid and method for using coal mine gas eliminating liquid |
| 12/11/2013 | CN103437808A Method for preparing coal mine gas instant eliminating liquid and method for using coal mine gas instant eliminating liquid |
| 12/11/2013 | CN103437807A Gas eliminating liquid preparing method and use method |
| 12/11/2013 | CN103437806A Preparation method and using method of coal mine gas dissolving agent |
| 12/11/2013 | CN103437805A Method for preparing liquid utilizing methane-oxidizing bacteria to dissolve gas and using method |
| 12/11/2013 | CN103437804A Method for preparing liquid utilizing methane-oxidizing bacteria to dissolve gas and using method |
| 12/11/2013 | CN103437803A Structure and method for gas drainage of drill holes of high-drainage drill field of coal mine |
| 12/11/2013 | CN103437705A Directional and quick hole-forming device for mining-coal bed gas extraction multi-branch holes |
| 12/11/2013 | CN102562133B Device and method for sealing and drilling holes of gas drainage |
| 12/04/2013 | CN203321584U Gas separating device |
| 12/04/2013 | CN203321571U Gas extraction tube |
| 12/04/2013 | CN103422847A Gas extraction method based on mining-induced fracture circular rectangular half-space zone |
| 12/04/2013 | CN102587828B Gas extraction and drilling cooperative drilling and protecting integrated system for soft coal seams and process |
| 12/04/2013 | CN102345469B Test analog device for studying gas migration in mined-out area under different ventilation conditions |
| 11/27/2013 | CN203308507U Active deslagging and drainage device |
| 11/27/2013 | CN203308506U Mine lot distribution type coal mine gas mining combined cooling heating and power energy system |
| 11/27/2013 | CN203308448U Coal nozzle hole protection device |
| 11/27/2013 | CN103410557A Single and low-air-permeability coal bed gas control method |
| 11/27/2013 | CN103410495A Gas-water separator with automatic cooling function |
| 11/27/2013 | CN103410467A Hole drilling and sealing device and method with continuous belt pressure |
| 11/27/2013 | CN103410461A Three-proof device in drilling process |
| 11/27/2013 | CN102022093B Reactive type foamy hole sealing system |
| 11/20/2013 | CN203296804U Gas extraction safety hazard monitoring system |
| 11/20/2013 | CN203296803U High-pressure extraction hole blowout preventer |
| 11/20/2013 | CN203296802U Gas electromagnetism exciting device |
| 11/20/2013 | CN103397900A Porous collaborative fracturing and extracting integrated gas extraction method |
| 11/20/2013 | CN103397882A Coal mining method and mine structure capable of preventing underground coal mine gas explosion and combustion |
| 11/20/2013 | CN102383828B Refection reducing and outburst eliminating method for deep-hole hydraulic fracture driving gas shallow hole extraction |
| 11/20/2013 | CN102383826B Hole sealer and hole sealing process realized by using same |
| 11/20/2013 | CN102350150B Filter pipe for suction and discharge of biogas-containing stratum gas |
| 11/20/2013 | CN102261241B Device and method for measuring signal hole in mine gas extraction system |
| 11/20/2013 | CN102230395B Multifunctional hole packer capable of plugging and injecting |
| 11/20/2013 | CN102128047B Gas-slag separation and recovering system for drilling construction |
| 11/13/2013 | CN203286154U Spiral reinforcing rib compound pipe |
| 11/13/2013 | CN203285480U Blowout-preventing device used for assisting high-pressure water jet slotting |
| 11/13/2013 | CN203285479U Underground movable gas drainage pump for coal mine |
| 11/13/2013 | CN103388487A Recovery device for methane in mine discharged air and application thereof |
| 11/06/2013 | CN203271799U Mine lot distributing type coal mine gas near-zero emission poly-generation energy supply system |
| 11/06/2013 | CN203271780U Coal mine coal mining working surface upper corner gas extraction device and hydraulic support |
| 11/06/2013 | CN203271665U Umbrella-type hole sealing device |
| 11/06/2013 | CN102410040B Gas control method for return airflow corner of coalmine coal working face |
| 11/06/2013 | CN102392640B Close-range thin coal layer simultaneous mining and parallel transporting method |
| 10/31/2013 | WO2013159716A1 Gas outburst prevention and control method |
| 10/30/2013 | CN203259208U Coal mine drilling gas extraction metering device |
| 10/30/2013 | CN203257455U Mixed utilizing device for windblown mine gas |
| 10/30/2013 | CN102226413B Gas extraction method of cross hole drilling area of gas discharge laneway |