| 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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| 10/10/2012 | CN202483612U Polyvinyl chloride gas-drainage pipe for underground coal mine |
| 10/10/2012 | CN202483611U A gas-water separate type negative-pressure water discharge device for gas pipes |
| 10/10/2012 | CN102720528A Underground coal mine repeating pulsation hydrofracture strengthened gas extracting method |
| 10/10/2012 | CN102720527A Multi-bed type ventilation air methane regenerative thermal oxidation device |
| 10/10/2012 | CN102720526A Double-plug piping method of heavy-caliber gas exhaust hole working sleeve |
| 10/03/2012 | CN202467897U High-negative-pressure automatic water discharging device for gas drainage pipeline |
| 10/03/2012 | CN202467896U Hole sealing device adopting annular air bag |
| 10/03/2012 | CN202467895U Mining explosion-proof digital intelligent gas drainage pump |
| 10/03/2012 | CN202467894U Sampling pipe for borehole gas drainage |
| 10/03/2012 | CN202467893U Gas, water, slag separation integrated apparatus |
| 10/03/2012 | CN102704986A Pressure-controlled hole sealing method for gas drainage hole |
| 10/03/2012 | CN102704985A Automatic water draining device for coal mine gas extraction pipeline under negative pressure |
| 10/03/2012 | CN102704984A Borehole high-concentration gas extraction and drainage method and device thereof |
| 10/03/2012 | CN102704905A Segmental hydraulic fracturing coal seam pressure releasing device and method |
| 09/26/2012 | CN202451203U Mining gas drainage and coal-bed flooding integrated hole packer |
| 09/26/2012 | CN202451047U All-hydraulic double-pole soft coal drilling machine |
| 09/26/2012 | CN102691515A Coal mine underworkings-type coal-seam gas fracturing equipment |
| 09/19/2012 | CN202441418U Gas gathering device |
| 09/19/2012 | CN202441417U Coal mine gas extracting hole sealing device |
| 09/19/2012 | CN202441416U Gas drainage pipeline for coal mine |
| 09/19/2012 | CN202441381U Waterpower self-spinning type cutting spray nozzle having suck-back prevention function |
| 09/19/2012 | CN102681494A Intelligent control method for efficient extraction of coalbed methane in goafs |
| 09/19/2012 | CN102678167A Hydraulic-fracturing rock cross-cut coal uncovering method for short-distance coal beds |
| 09/19/2012 | CN102678166A Method for increasing gas extraction rate by permeability increasing of single thick coal seam |
| 09/19/2012 | CN102678165A Integral combining device for extraction pipeline |
| 09/19/2012 | CN102678164A Hole sealing device for multi-parameter testing of coal mine underground gas |
| 09/19/2012 | CN102678084A Cylindrical hole sealing bag |
| 09/19/2012 | CN102671503A Gas and residue separating device |
| 09/19/2012 | CN102671476A Gas and slag separation device used in gas drainage for underground coal mine |
| 09/19/2012 | CN102121395B Method for integrated comprehensive management of gas in low-permeability single coal bed |
| 09/12/2012 | CN202431295U Gas-slag separation integrated temporary pumping device for coal mine underground drilling |
| 09/12/2012 | CN102661167A Protected seam bottom plate upward comb-shaped drilled hole gas extraction method |
| 09/12/2012 | CN102661166A Method for purifying gas extracted by mine by using ionic liquid |
| 09/05/2012 | CN202417593U Elastic negative-pressure automatic slagging water discharge device |
| 09/05/2012 | CN202417577U Coal mine underground instantly-drawing gas extraction pipe |
| 09/05/2012 | CN202417576U Gas pumping and drainage connection device |
| 09/05/2012 | CN202417575U Automatic water drainage slag discharge device for mine gas drainage system |
| 09/05/2012 | CN202417403U Hole sealing device for gas extraction |
| 09/05/2012 | CN202417315U Coal mine gas extraction-hole drill bit |
| 09/05/2012 | CN102654061A Pipeline water storage and discharge device and gas extraction system |
| 09/05/2012 | CN102654049A Porous linear control hydraulic fracturing method |
| 09/05/2012 | CN102071961B Downward gas drainage drill hole and pressure testing drill hole sealing method |
| 09/05/2012 | CN101963043B Positive pressure jet spiral sampling drill |
| 08/29/2012 | CN102650203A Buoyant valve and self-balancing arrangement method for valve-contained operation sleeve for gas pumping hole |
| 08/22/2012 | CN202393443U Connecting tee joint for gas flow measurement |
| 08/22/2012 | CN202391461U Gas drainage tail-end system |
| 08/22/2012 | CN102644479A Automatic water drainage device for gas extraction |
| 08/22/2012 | CN102644477A Method for extracting gas of protected layer through wear layer drilling in protective layer airway high-position drilling field |
| 08/22/2012 | CN102644476A Method for pumping gas of protected layer by layer penetration and hole drilling on high-position drilling fields of protecting layer machinery tunnel |
| 08/22/2012 | CN102080526B Method for extracting gas from bedding level fractured well of ground coal seam roof |
| 08/22/2012 | CN102080518B Method for extracting gas from coal seam roof complex branched well |
| 08/22/2012 | CN102003186B Double-roadway tunneling construction process |
| 08/15/2012 | CN202381867U Gas drainage connecting hose |
| 08/15/2012 | CN102635395A Method for governing gas ultralimit during initial mining stage of coal mine working face |
| 08/15/2012 | CN102635394A Gas, water and coal separation device of coal-mine gas spray hole |
| 08/15/2012 | CN102635393A Combined hole sealing method for gas extracting and drilling delaying self-expansion capsule-paste |
| 08/15/2012 | CN102635392A Co-extraction method for pillar-less coal and gas of advanced entry-retaining construction extraction engineering |
| 08/15/2012 | CN102635391A Method for preventing and controlling gas outburst |
| 08/15/2012 | CN102635390A Method, device and simulation experiment system for simulating gas pressure propagation during process of drainage production of coal-bed gas well |
| 08/15/2012 | CN102635389A Method for gas drainage from high-position roadway coal seam containing shielded soft rock |
| 08/15/2012 | CN102635388A Interaction permeability-increasing method of pre-splitting blasting and hydraulic cracking of coal seam |
| 08/15/2012 | CN102635341A Circular and automatic water replenishing and drainage and production equipment for coal-bed gas well |
| 08/09/2012 | WO2012103591A1 Differential pressure energy generation |
| 08/08/2012 | CN202370440U Circular arc-shaped prismatic drill rod for pumping gas from coal bed |
| 08/08/2012 | CN202370431U Linear drilling device of mine gas drainage drill rod |
| 08/08/2012 | CN102628371A Water seal drill site gas extraction method of inclined coal seam groups |
| 08/08/2012 | CN102628370A Mobile natural ventilation and gas collecting device for underground mine |
| 08/08/2012 | CN102628352A Multi-section fixed point hydraulic fracturing method |
| 08/08/2012 | CN102628345A Sealing method of high sealing quasi-horizontal drilling hole |
| 08/01/2012 | CN202360131U Fireproof and corrosion resistant gas drainage tube |
| 08/01/2012 | CN202360130U Gas drainage collection box |
| 08/01/2012 | CN202360037U Anti-collapse porous blocking pipe |
| 08/01/2012 | CN202358437U Hole sealing bag for gas drainage hole |
| 08/01/2012 | CN102619553A Spiral catcher |
| 08/01/2012 | CN102619552A Directional hydraulic pressing penetration, permeability increase and outburst elimination method of guide groove |
| 08/01/2012 | CN102619488A Hole sealing method for gas drainage drill |
| 08/01/2012 | CN102619476A Pipe body structure of step type hole protecting pipe for gas extraction hole in soft coal bed |
| 08/01/2012 | CN102619475A Alveolate drill stem |
| 07/25/2012 | EP2477727A1 Process and apparatus for removal of volatile organic compounds from a gas stream |
| 07/25/2012 | CN202348323U Coal mine gas drainage drill combination hole-main pipe hole linkage structure |
| 07/25/2012 | CN202348252U Gas, coal and water separation device |
| 07/25/2012 | CN202348217U Syringe-type grout injector |
| 07/25/2012 | CN202348211U Complete equipment for preventing gas emission from drill hole |
| 07/25/2012 | CN202348210U Orifice blowout preventer for drilling |
| 07/25/2012 | CN202348181U Gas-proof nozzle orifice water-coal-gas separator |
| 07/25/2012 | CN202348133U Gas drainage anti-spraying drill rod |
| 07/25/2012 | CN102606191A Drilling, flow guiding, dust falling and gas blowout control device |
| 07/25/2012 | CN102606190A Method and device for using downward crossing hole to eliminate outburst in mining of coal mine |
| 07/25/2012 | CN102606130A Gas-water separation connecting method for coal mine extraction drilled hole and connecting structure |
| 07/25/2012 | CN102071958B Inverse Y-shaped ventilation method for coal mining working face |
| 07/25/2012 | CN102022133B Regional gas underground high-pressure jet hole digging, pressure relief and outburst prevention method |
| 07/25/2012 | CN101975285B Five-way plastic valve for drilling hole during gas extraction, and installation and use method thereof |
| 07/25/2012 | CN101975078B Gas extraction drilling coupling device and installation and use method thereof |
| 07/18/2012 | CN202338662U 防回气防回水泄爆装置 Anti-anti-return back to the gas venting device |
| 07/18/2012 | CN202338354U 一种岩石穿层孔防喷装置 One kind of rock layers through holes blowout preventer |
| 07/18/2012 | CN202338352U 煤矿通风系统 Mine ventilation systems |
| 07/18/2012 | CN202338322U 一种管道瓦斯传感器气水分离器 One kind of pipeline gas sensor gas-water separator |
| 07/18/2012 | CN102587962A Methods for arranging and supporting wall-expanded gas extraction drill sites |
| 07/18/2012 | CN102587961A Feeding method and device for hole protecting pipe for soft coal seam gas extraction hole |
| 07/18/2012 | CN102587960A Arrangement method of high gas coal seam extraction working face roadway |