| 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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| 07/17/2013 | CN203067018U Offset gas-liquid two-phase jet flow slotting permeability-increasing device |
| 07/17/2013 | CN203067017U Device for preventing spraying of coal or gas in drilling and cutting |
| 07/17/2013 | CN203067016U Gas-liquid two-phase jet flow slotting system |
| 07/17/2013 | CN203067015U Deep-pumping shallow-protecting type gas extraction device |
| 07/17/2013 | CN203067014U Hole sealing device for improving gas extraction concentration |
| 07/17/2013 | CN203066884U Arc-shaped ribbed drill rod with central hole allowing gas release pipe to insert |
| 07/17/2013 | CN103206238A Method for preventing and controlling gas on low-permeability outburst coal seams |
| 07/17/2013 | CN103206190A Rapid inflation grouting hole-sealing method |
| 07/17/2013 | CN102392676B Integrated device for separating gas, water and slag |
| 07/17/2013 | CN102042027B Coal mine gas drilling drainage device |
| 07/10/2013 | CN203050778U High-negative-pressure automatic water drainage device of gas drainage pipeline |
| 07/10/2013 | CN203050764U One-way control device for pre-buried gas release pipe |
| 07/10/2013 | CN203050763U One-way control device for pre-buried gas release pipe |
| 07/10/2013 | CN203050762U Gas pipeline deslagging device |
| 07/10/2013 | CN203050543U Circular arc-shaped convex edge drill rod with center hole capable of allowing gas release pipe to insert |
| 07/10/2013 | CN203050508U Underground hydraulic punching device |
| 07/10/2013 | CN203050503U Super-deep-hole double-tube directional drilling machine |
| 07/10/2013 | CN103195988A Mineral methane gas drainage pipe and production method thereof |
| 07/10/2013 | CN103195472A Negative pressure stabilizing device for gas pumping under coal mine |
| 07/10/2013 | CN103195471A Method for preventing drilling collapse of downhole coal bed |
| 07/10/2013 | CN103195470A Gas discharge collecting device for drilling construction |
| 07/10/2013 | CN103195469A Pneumatic type gas and slag separation device and method |
| 07/10/2013 | CN103195468A System process for conducting efficient strengthened extraction in surrounding rock |
| 07/10/2013 | CN103195467A Hydraulic fracturing and grouting solidification combined rock cross-cut coal uncovering method |
| 07/10/2013 | CN103195466A Directional water pressure blasting method for improving coal bed gas permeability |
| 07/10/2013 | CN103195388A Two-plugging hole packer and plugging grouting method |
| 07/09/2013 | US8479812 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 07/03/2013 | CN203035094U Water jet flow kerf induced spraying device in drill hole |
| 07/03/2013 | CN203035089U Split type special drill for drawing out methane |
| 07/03/2013 | CN203035087U Liftable downhole hydraulic punching device |
| 07/03/2013 | CN203033175U Portable hole sealing bag for sealing gas drainage hole |
| 07/03/2013 | CN102199991B Drilling-fixing integrated device and method for yolk coal terrane |
| 06/26/2013 | CN203022804U Leakage-proof device for observation hole of gas extraction pipeline |
| 06/26/2013 | CN203022803U Wind-pressing-type fast hole sealing device for underground coal mine |
| 06/26/2013 | CN203022681U Drilling and hole sealing device |
| 06/26/2013 | CN103174453A Layered hydraulic fracturing method of underground coal mine multiple coal seams |
| 06/26/2013 | CN102022079B Outburst-prevention drilling machine on mining surface of gassy outburst coal mine and frequency conversion variable liquid-supplying self-walking pump station thereof |
| 06/25/2013 | US8469119 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 06/19/2013 | CN203008957U Synthetic polyurethane foaming bag for gas extraction hole sealing |
| 06/19/2013 | CN203008856U Cement buoyancy valve in gas pump drainage hole operating sleeve |
| 06/19/2013 | CN203008850U Separation type hole-sealing bag |
| 06/19/2013 | CN103161493A Gas-liquid-solid three-phase coupling blasting weakening rock burst and permeability increasing method |
| 06/19/2013 | CN103161492A Gas extraction well location method based on overlying rock fracture shell |
| 06/19/2013 | CN103161443A Detection and sealing integrated method and device for gas extraction drill hole |
| 06/19/2013 | CN102322287B Gas drainage, dilution and mixing demister |
| 06/19/2013 | CN102278135B Vortex type extracted gas dilution mixer for coal mine |
| 06/19/2013 | CN102230393B Gas intake, exhaust and flow guide device of coal mine ventilation air methane preheating catalytic oxidizer |
| 06/19/2013 | CN102200024B Gas extraction center divided-flow type grouting and hole sealing device and hole sealing method |
| 06/19/2013 | CN102071921B Underground drilling and fracturing-integrated staged fracturing device and gas drainage process |
| 06/18/2013 | US8464784 Method and system for accessing subterranean deposits from the surface and tools therefor |
| 06/12/2013 | CN202991128U Automatic negative-pressure drainage device for coal mine gas drainage pipeline |
| 06/12/2013 | CN202991127U Automatic drain device for mining gas drainage pipeline |
| 06/12/2013 | CN202991109U Anti-explosion anti-backfire device |
| 06/12/2013 | CN202991004U Separating, delivering and classifying device for coal, gas and water drilled from coal bed |
| 06/12/2013 | CN202990948U Anti-spray orifice apparatus for gas control |
| 06/12/2013 | CN202983291U Gas and coal water separating device |
| 06/12/2013 | CN103147788A Positive pressure and negative pressure combined gas drainage process by pressurizing coal body of thick coal seam |
| 06/12/2013 | CN102337922B Method for inspecting burst-preventing effect of areas |
| 06/12/2013 | CN102031954B Coal and rock bore hydraulic fracture experimental apparatus |
| 06/05/2013 | CN202971914U Dynamic and static combined sealing structure |
| 06/05/2013 | CN202970767U Air bag plugging device |
| 06/05/2013 | CN202970766U Separating device of capsule hole packer and manual pump |
| 06/05/2013 | CN202970765U Intelligent autonomous dynamic hole sealing gas extraction system for coal mine |
| 06/05/2013 | CN202970764U Self-balancing water-seal fire-retardant explosion venting device for transporting methane gas by pipeline |
| 06/05/2013 | CN202970606U Recoverable hole sealer of gas drainage drill hole |
| 06/05/2013 | CN103134448A Test method of drill hole gas extraction effective radius |
| 06/05/2013 | CN103133028A Underground coal seam hydrofracture crack oriented developing method |
| 06/05/2013 | CN103132952A Gas mining machine |
| 06/05/2013 | CN103132909A Coal mine gas extraction hole drill |
| 06/05/2013 | CN102278133B Individual overflow water seal fire relief and explosion release device |
| 06/05/2013 | CN102226412B Underground dark mining drilling well gas extraction method |
| 06/05/2013 | CN102094611B Coal mine under-well fracturing complete equipment |
| 05/29/2013 | CN202954839U Gas electrical generation system |
| 05/29/2013 | CN102052087B Using polyurethane foaming bag to block gas drainage hole |
| 05/22/2013 | CN202946188U Gas extraction drilling hole multiphase medium plugging device |
| 05/22/2013 | CN202946099U Gas extraction drill hole group regional fracture field secondary grouting plugging device |
| 05/22/2013 | CN103114871A Extraction device and method utilizing microwave coal heating layer |
| 05/22/2013 | CN103114870A Multi-field coupling coal bed methane extraction physical simulation testing system |
| 05/22/2013 | CN103114827A Multi-field coupling coal bed methane extraction simulation testing method |
| 05/22/2013 | CN102155254B Method for extracting gas in low air permeability coal layer by pulse fracture anti-reflection |
| 05/22/2013 | CN102121393B Method and system for continuously pumping gas in coal uncovering process of vertical shaft |
| 05/22/2013 | CN101975077B High-outburst coal mine coal roadway drilling-loading-bolting integrated machine |
| 05/22/2013 | CN101787897B System and method for predicting coal and gas outburst risk of mine in real time |
| 05/22/2013 | CN101718212B Device for tracking and early warning outburst danger of mine coal and gas in real time |
| 05/22/2013 | CN101158267B Method and system for accessing subterranean deposits from the surface |
| 05/15/2013 | CN202937302U Automatic water drainage device of gas drainage pipeline |
| 05/15/2013 | CN202937298U Automatic drainage slag removal device of mine gas extraction pipe |
| 05/15/2013 | CN202937297U Gas drainage device |
| 05/15/2013 | CN202937296U Multifunctional coal bed gas exploitation process pipe string |
| 05/08/2013 | CN202926378U Pectination vinyon flange combined type extraction and discharge device |
| 05/08/2013 | CN202926275U Grouting capsule-type hole packer with multiple seal sections |
| 05/08/2013 | CN103089295A Coalbed methane gas drainage testing method during combined mining of multiple coalbeds |
| 05/08/2013 | CN103089294A Multi-well casing net-shaped device of coal bed gas exploration and coal underground gasification |
| 05/08/2013 | CN103089293A Slag removal unit |
| 05/08/2013 | CN102296982B Method for electrochemically strengthening desorption and seepage of coal gas |
| 05/07/2013 | US8434568 Method and system for circulating fluid in a well system |
| 05/01/2013 | CN202914134U Mine drainage device |
| 05/01/2013 | CN202914127U Whole sealing mine pneumatic methane accumulation drainage machine |
| 05/01/2013 | CN202914126U Support device for hydraulic fracturing hole-sealing capsule |
| 05/01/2013 | CN103075181A Bedding long drilling hole seam cutting and hole washing integral coal bed gas extraction method |