| 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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| 03/06/2013 | CN102953752A Sealing method of water-containing drill hole for gas extraction |
| 03/06/2013 | CN102953751A Coal-mine vertical water coal rock powder treater |
| 03/06/2013 | CN102953750A Self-balancing water-sealed fire-retarding and explosion-venting device for gas pipeline transportation |
| 03/06/2013 | CN102953749A Pumping drill hole plugging device and pumping drill hole plugging method |
| 03/06/2013 | CN102061918B Coal mining method for co-mining gas in mine |
| 03/06/2013 | CN101956546B Method for improving crossing-hole gas extraction concentration |
| 03/06/2013 | CN101581232B Method for pre-pumping coal body gas by concussion fracture of high-pressure gas |
| 02/27/2013 | CN202756017U Water discharging machine with slag discharged automatically |
| 02/27/2013 | CN202756010U Methane drawing out device for deep hole fracture blasting control |
| 02/27/2013 | CN202756009U Mining drilling dust removal and gas drainage device |
| 02/27/2013 | CN202756008U Coal mine gas drainage gas-water separator pipeline |
| 02/27/2013 | CN202755893U Gas drainage drill bit capable of being embedded with exhaust pipe |
| 02/27/2013 | CN102943687A Pressure equalizing and hole sealing method for gas extraction drilling |
| 02/27/2013 | CN102155253B Ground pumping and mining coal seam gas well reformation method based on recurrence frequency impact waves |
| 02/20/2013 | CN202746799U Epoxy resin coat composite steel tube for underground coal mine |
| 02/20/2013 | CN202745936U Automatic water discharge device of gas extraction system |
| 02/20/2013 | CN202745934U Downward extraction borehole drainage device |
| 02/20/2013 | CN202745920U Gas coal dust separator |
| 02/20/2013 | CN202745919U Backward crossing shield type drainage system for mining face upper corner |
| 02/20/2013 | CN202745721U Gas drainage drill rod |
| 02/20/2013 | CN102937012A Cement buoyant valve in gas pumping hole working sleeve and manufacture method thereof |
| 02/20/2013 | CN102937011A Secondary grouting and plugging device and method of regional crack field of gas extraction and drilling group |
| 02/20/2013 | CN102094668B High-pressure hydraulic tunneling, pressure releasing and protrusion removing method for upper drainage roadway |
| 02/20/2013 | CN102080525B High-pressure gas injection hole-drilling pressure-releasing outburst prevention method |
| 02/20/2013 | CN101975023B Method and device for drilling deep and long gas drainage hole in soft coal seam along layers |
| 02/20/2013 | CN101824999B Technology for measuring gas pressure of coal bed by utilizing through beds hole |
| 02/19/2013 | US8376052 Method and system for surface production of gas from a subterranean zone |
| 02/13/2013 | CN202732012U Ventilation air methane oxidization power generation system |
| 02/13/2013 | CN202724949U Deslagging device for gas pipeline |
| 02/13/2013 | CN202724888U Gas pipeline coal cinder filter |
| 02/13/2013 | CN102926797A Drilling, dust discharging and permeability-increasing integrated device for high gas pressure, high geostress and high crushing (three-high) area of coal mine |
| 02/13/2013 | CN102926796A Deslagging method and deslagging device of gas pipeline |
| 02/13/2013 | CN102926795A Gas extraction method and gas extraction system |
| 02/13/2013 | CN102926697A Orifice plugging device, gas extraction system and orifice plugging method |
| 02/13/2013 | CN102921195A Gas and coal water separation device |
| 02/13/2013 | CN102536301B Protective layer exploitation and gas pumping-exhaust management system and using method thereof |
| 02/13/2013 | CN102230394B Secondary hole sealing system for improving coal bed gas extraction concentration |
| 02/13/2013 | CN102146794B Grouting, consolidating and gob-side tunneling process method |
| 02/13/2013 | CN102135009B Automatic water discharging device |
| 02/13/2013 | CN102128046B Automatic water discharge device |
| 02/13/2013 | CN102061919B Co-mining tunneling method of seam roadway gas |
| 02/12/2013 | US8371399 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 02/06/2013 | CN202718706U Separating device of mine ventilation air gas |
| 02/06/2013 | CN102913274A System for increasing yield of gas excavation borehole and method thereof |
| 02/06/2013 | CN102913273A Autonomous dynamic sealing and gas extraction intelligent system for coal mine |
| 02/06/2013 | CN102913272A Device and method for displacing methane gas with positive pressure air |
| 01/30/2013 | CN202709139U Combustion heat energy utilization device for mine windblown mine gas |
| 01/30/2013 | CN202707131U Gas-injection well body structure for gas-injection exploiting coal bed gas |
| 01/30/2013 | CN202706937U Gas drainage drill pipe |
| 01/30/2013 | CN102900465A Downward pumping and extracting hole drainage device |
| 01/30/2013 | CN102900460A Method for performing through-going seam cutting, pressure relief, permeability enhancement and quick tunneling on soft and high-outburst coal seam |
| 01/30/2013 | CN102900459A Self-balancing water-seal-type anti-explosion device |
| 01/30/2013 | CN102900417A Sand charging device used during fracturing or slotting under coal mine and sand charging control method |
| 01/30/2013 | CN102900396A Method for integrally sealing and separating gas extraction drilled hole in coal seam |
| 01/30/2013 | CN102155257B Benching drilling pressure releasing and outburst-prevention method |
| 01/30/2013 | CN101906988B Remote-control underground gas extraction drilling machine |
| 01/23/2013 | EP2547426A2 Method for minimizing nitrogen oxide gases in underground mining and tunnel construction |
| 01/23/2013 | CN202690130U Gas drainage automatic dewatering and deslagging device |
| 01/23/2013 | CN202690117U Ventilation air collecting and mixing system |
| 01/23/2013 | CN202690116U Permeability-increasing and outburst-removing device for coal seam |
| 01/23/2013 | CN202690115U Device for purifying gas extracted in mine by ionic liquid |
| 01/23/2013 | CN202690114U Sealant-injection hole sealing device for gas drilling hole of coal mine |
| 01/23/2013 | CN202690072U Mining roadway structure capable of preventing corner gas on coal mining work face from accumulating |
| 01/23/2013 | CN202690005U Expanded secondary quick pressure hole sealing device |
| 01/23/2013 | CN202689940U Gas drainage drill bit |
| 01/23/2013 | CN202689937U Drill bit for gas drainage hole of coal mine |
| 01/23/2013 | CN102889098A Water discharging device of gas extraction pipeline |
| 01/23/2013 | CN102889068A Hole sealing device and method |
| 01/23/2013 | CN102071955B Soft outburst coal seam tunneling reserved coal body reinforcement and outburst-proof method |
| 01/23/2013 | CN102071920B Gas extraction equipment and method for low permeability coal bed gas |
| 01/23/2013 | CN102003173B System and method for automatically measuring and recording gas pressure during coal seam hole sealing |
| 01/16/2013 | CN202673332U Gas collector capable of removing dust |
| 01/16/2013 | CN202673319U Movable natural ventilation and gas collector for underground mines |
| 01/16/2013 | CN202673167U Three-arris drill pipe special for coal mine underground gas drainage |
| 01/16/2013 | CN102877882A Method for plugging methane gas extraction hole |
| 01/16/2013 | CN102877881A Supporting device used for hydrofracture hole-sealing capsule |
| 01/16/2013 | CN102877880A Setback crossed shield extraction system on upper corner of working face and extraction method |
| 01/16/2013 | CN102877789A Drilling and cutting integrated drilling bit |
| 01/16/2013 | CN101975054B High-pressure hydraulic cutting machine for cutting coal seams |
| 01/09/2013 | CN202659273U Oil cylinder for ejector |
| 01/09/2013 | CN102865104A Downward extraction drilling drainage device |
| 01/09/2013 | CN102865096A Ventilation air methane (VAM) suction device |
| 01/09/2013 | CN102865095A Anti-spray dust removing device for bedding drilling |
| 01/09/2013 | CN102865092A U+U type laneway ventilating system of coalface |
| 01/09/2013 | CN102102530B Water drainage system and method based on downward drainage borehole |
| 01/08/2013 | CA2661725C Method and system for accessing subterranean deposits from the surface |
| 01/02/2013 | CN202646871U Electro-hydraulic linkage rapid closing stop valve for coal mine gas extraction pipeline |
| 01/02/2013 | CN202645919U Pneumatic hole-sealing pump |
| 01/02/2013 | CN202645621U Negative-pressure automatic water discharger |
| 01/02/2013 | CN202645620U Device automatically controlling coal mine gas explosion |
| 01/02/2013 | CN202645619U Colliery transfinite gas prevention system |
| 01/02/2013 | CN102852547A Drilling and cutting integrated outburst preventing and permeability improving system for mines |
| 01/02/2013 | CN102852546A Method for pre-pumping coal roadway stripe gas of single soft protruded coal seam of unexploited area |
| 01/02/2013 | CN102852506A High-pressure pneumatic blasting pressure relieving and transmission increasing method |
| 01/02/2013 | CN102852490A High gas suction and discharge process method for complex well |
| 01/02/2013 | CN102847397A Cleaner unit and gas extraction system |
| 01/02/2013 | CN102116170B Method for determining grid type layer-through drilling intervals of floor roadway |
| 01/02/2013 | CN102003201B Gas drainage method in gob of coal mine |
| 01/02/2013 | CN101985888B Method for draining gas of highly gassy coal mine |
| 12/27/2012 | CA2840118A1 Mining method for gassy and low permeability coal seams |