| 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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| 09/14/2011 | CN101696637B Coal and gas separation bin and method thereof |
| 09/07/2011 | CN201963342U 抽排煤矿井下瓦斯钻孔积水装置 Drainage water means coal mine gas drilling |
| 09/07/2011 | CN201963341U 煤矿瓦斯综合应用系统 Gas Comprehensive Application System |
| 09/07/2011 | CN102174899A Intelligent regulation and control system for safe coal bed gas gathering and transportation in coal mine area |
| 09/07/2011 | CN102174897A Flat-board type ultralow concentration gas heat gathering device |
| 08/31/2011 | CN201956883U 煤层气开采用控制柜 CBM using the control cabinet |
| 08/31/2011 | CN201953399U 矿用瓦斯抽放自动放水器 Mine gas drainage automatically turn on the water |
| 08/31/2011 | CN201953398U 煤层气开采用自动放空装置 CBM automatic venting device |
| 08/31/2011 | CN201953368U 煤矿井下压裂成套装置 Coal Mine fracturing sets of devices |
| 08/31/2011 | CN201953367U 井下钻孔钻压一体化分段压裂装置 Downhole drilling WOB staged fracturing device integration |
| 08/31/2011 | CN102168575A Loose blasting gas extraction technology of horizontal branch well of coal seam floor |
| 08/31/2011 | CN102168544A Method for surface modification and transmission increase of coal reservoirs by using chlorine dioxide |
| 08/31/2011 | CN101649740B Ground bored well body structure for gas extraction |
| 08/31/2011 | CN101569821B Gas absorbent for reducing gas concentration |
| 08/24/2011 | CN201943750U 自动放水装置 Automatic drainage device |
| 08/24/2011 | CN201943738U 一种用于连接抽放瓦斯水泥管的开口橡胶套 A cement pipe connecting the gas drainage opening rubber sleeve |
| 08/24/2011 | CN201943577U Longhole drill carriage angle adjusting mechanism for mines |
| 08/24/2011 | CN102162367A Arrangement method for gas drainage drill sites of highly-gassy fully-mechanized top-coal caving surface |
| 08/17/2011 | CN201934138U Gas extraction drainage device and gas extraction drainage system |
| 08/17/2011 | CN201934137U 一种用于煤矿瓦斯抽采管的自动放水器 A coal mine gas drainage tube automatically turn on the water |
| 08/17/2011 | CN201934126U Down-hole drilling gas drainage device |
| 08/17/2011 | CN201934125U Coal mine drainage borehole gas-water separation connecting structure |
| 08/17/2011 | CN201934051U 自成形挡板及其反应型泡沫封孔密封装置 Baffles and reactive self-forming foam sealing sealing device |
| 08/17/2011 | CN102155257A Benching drilling pressure releasing and outburst-prevention method |
| 08/17/2011 | CN102155256A Method for preventing gas extraction hole from collapsing |
| 08/17/2011 | CN102155255A Safety production power generation technology by unstable gas source |
| 08/17/2011 | CN102155254A Method for extracting gas in low air permeability coal layer by pulse fracture anti-reflection |
| 08/17/2011 | CN102155253A Ground pumping and mining coal seam gas well reformation method based on recurrence frequency impact waves |
| 08/17/2011 | CN101598034B Method for forecasting coal and gas outburst on site |
| 08/10/2011 | CN201924958U 矿用瓦斯自动封口器 Mine gas automatic sealing device |
| 08/10/2011 | CN201924897U 卸压煤层气地面抽采井的井身结构 Relief CBM drainage wells in the ground well structure |
| 08/10/2011 | CN201924890U 一种新型煤层气地面抽采装置 A new coal-bed methane extraction device ground |
| 08/10/2011 | CN201924876U 新型矿用注浆封孔器 The new mine grouting sealing device |
| 08/10/2011 | CN1776196B Method and system for accessing subterranean deposits from the surface |
| 08/10/2011 | CN102146803A Collection and utilization system outside coal mine gas well |
| 08/10/2011 | CN102146794A Grouting, consolidating and gob-side tunneling process method |
| 08/10/2011 | CN101975086B Full-automatic overflow device for gas extraction by drill holes in high-positioned drill site |
| 08/10/2011 | CN101839472B Method for reclaiming heat of ventilated gas oxidation device |
| 08/10/2011 | CN101705836B Jet control device and method |
| 08/10/2011 | CN101672196B Method for improving amount of drained, extracted and pressure released gas in surface well drilling |
| 08/10/2011 | CN101634231B Method for reinforcing and sealing coal mine and preventing gas |
| 08/03/2011 | CN201915999U 综采工作面前、后溜机尾护罩 Mechanized mining work before, after wandering the tail shield |
| 08/03/2011 | CN201915990U 一种瓦斯催化氧化装置的组合式氧化床 Combined oxidation bed catalytic oxidation of a gas device |
| 08/03/2011 | CN201915989U 矿井瓦斯抽排封孔器 Mine gas drainage sealing device |
| 08/03/2011 | CN201915984U 风流调控装置 Merry control devices |
| 08/03/2011 | CN201915893U 反应型泡沫封孔系统 Reactive foam sealing system |
| 08/03/2011 | CN201915891U Overflow prevention structure for underground drilling construction of coal mine |
| 07/27/2011 | CN201908676U Mine gas drilling-draining device |
| 07/27/2011 | CN102135014A Automatic draining device |
| 07/27/2011 | CN102135011A Device for pumping coal bed gas through underground radial drilling |
| 07/27/2011 | CN102135010A Fracturing detector under coal mine well |
| 07/27/2011 | CN102135009A Automatic water discharging device |
| 07/27/2011 | CN102134965A Long positioned drill hole drilling tool for extracting gas from coal seam roof and construction method thereof |
| 07/27/2011 | CN101482027B Fast pressure-releasing coal sample room of coal and gas burst test |
| 07/27/2011 | CN101246364B Double-local fan fault diagnosis and automatic switching closedown integrated device |
| 07/20/2011 | CN201902237U Portable metal support |
| 07/20/2011 | CN201902234U Automatic negative pressure drainage device |
| 07/20/2011 | CN201902228U Automatic regulation and control early warning system for underground gas extraction pipeline concentration |
| 07/20/2011 | CN201902227U Dust removal and gas exhaust device for gas drilling construction |
| 07/20/2011 | CN102128048A Crossheading gas draining, fixing and connecting system for highly gassy mine |
| 07/20/2011 | CN102128047A Gas-slag separation and recovering system for drilling construction |
| 07/20/2011 | CN102128046A Automatic water discharge device |
| 07/20/2011 | CN102128045A Negative-pressure automatic water-draining device |
| 07/20/2011 | CN102128044A Dust-removing device and dust-removing system |
| 07/13/2011 | CN201896632U Drilling well for gas drainage |
| 07/13/2011 | CN201896631U Orifice safety device for gas extraction well |
| 07/13/2011 | CN201896630U Coal-mine digital outburst prevention mining on-line monitoring system |
| 07/13/2011 | CN201896613U Gas pressure measuring device |
| 07/13/2011 | CN102121395A Method for integrated comprehensive management of gas in low-permeability single coal bed |
| 07/13/2011 | CN102121394A Method for uncovering outburst coal seam by using pseudo lithosphere on laneway |
| 07/13/2011 | CN102121393A Method and system for continuously pumping gas in coal uncovering process of vertical shaft |
| 07/13/2011 | CN102121364A Well structure of pressure-releasing coal bed gas ground extraction well and arrangement method thereof |
| 07/13/2011 | CN101275469B Yolk coal rock formation downward hole pumping and mining pressure relief mash gas construction method |
| 07/06/2011 | CN1727636B Method and system for accessing subterranean deposits from the surface |
| 07/06/2011 | CN102116171A Method for rapid discharge of gas in tunnel |
| 07/06/2011 | CN102116170A Method for determining grid type layer-through drilling intervals of floor roadway |
| 07/06/2011 | CN102116169A Drainage method for pressure-relief gas baseboard stonehead of protected seam |
| 07/06/2011 | CN102116168A Gas drainage system and method for hyposmosis soft coal seams |
| 07/06/2011 | CN102116167A Ground and underground three-dimensional extraction system of coal seam gas |
| 07/06/2011 | CN101614134B Drilling-explosion-pumping triadic pressure-relief outburst-prevention method |
| 07/06/2011 | CN101614133B High pressure jet drilling and slotting integration pressure-release anti-burst method |
| 06/29/2011 | CN201884050U Flow rate gap bridge device for gas drainage pipeline |
| 06/29/2011 | CN201884049U Gas drainage and outburst prevention system for high-pressure water jet cutting and drilling interlocking coal seams with ultra-long drilled holes |
| 06/29/2011 | CN201883962U Plasma-clad wear-resistant spiral drill stem |
| 06/22/2011 | CN201874605U Remote control underground gas drainage drilling machine |
| 06/22/2011 | CN201874603U High-pressure and small-jet device for preventing and controlling outburst of coal and gas |
| 06/22/2011 | CN201874550U Auxiliary illuminating and monitoring control device for gas drainage drilling machine |
| 06/22/2011 | CN102102532A Automatic drainage device for mine gas extraction pipe |
| 06/22/2011 | CN102102530A Water drainage system and method based on downward drainage borehole |
| 06/22/2011 | CN101915086B Coal mine underground gas borehole fracturing method |
| 06/22/2011 | CN101915083B Method for extracting coalbed gases from coal mines by upper and lower combination |
| 06/15/2011 | CN201865687U Fixed connecting device for gas drainage |
| 06/15/2011 | CN201865621U Gas pressure type hole packer |
| 06/15/2011 | CN201865573U Crawler drill for belt-span drilling |
| 06/15/2011 | CN201865566U Spindle flexing type floating power head of coal-bed gas drill |
| 06/15/2011 | CN102094671A Three-dimensional gas extraction method for coal seams with low-permeability and low possibility of gas extraction |
| 06/15/2011 | CN102094670A Method for replacing mine goaf gas with carbon dioxide |
| 06/15/2011 | CN102094669A Three-dimensional source separated pressure-releasing gas treatment method |
| 06/15/2011 | CN102094668A High-pressure hydraulic drilling, pressure releasing and protrusion removing method for upper drainage roadway |
| 06/15/2011 | CN102094611A Coal mine under-well fracturing complete equipment |