Patents
Sitemap › E21 - Earth or rock drilling; Mining › E21F - Safety devices, transport, filling-up, rescue, ventilation, or drainage in or of mines or tunnels › E21F 7 - Methods or devices for drawing-off gases with or without subsequent use of the gas for any purpose
Patents for E21F 7 - Methods or devices for drawing-off gases with or without subsequent use of the gas for any purpose (2,187)
05/2009
05/27/2009CN201246181Y Mining gas rapid hole packer
05/27/2009CN101440716A Special type hole packer
05/27/2009CN101440715A Projecting-proof pressure relief method of drivage face
05/27/2009CN101440714A Use method of special type hole packer
05/20/2009CN201241725Y Mining polyurethane hole packer
05/20/2009CN101435338A Coal mine low concentration mash gas methane destroying method and apparatus
05/20/2009CN100489273C Method for separating coal mine gas
05/06/2009CN100485163C Coal bed gas drainage method and device
04/2009
04/29/2009CN201228557Y Simulation test device for upwelling of periodic coming pressure goaf on comprehensive face
04/29/2009CN101418799A Downward moving water ring vacuum pump station for coal mine
04/29/2009CN101418702A Coal mine ventilation air methane oxidation device, mash gas adding system and security protection mechanism
04/29/2009CN101418701A Using method for internal horn hole packer
04/29/2009CN101418679A Method for pumping coalbed gas by heating coal bed
04/22/2009CN101413399A Drill hole spray safety protection system
04/22/2009CN101413398A Heating start-up system of mine ventilation air methane oxidized apparatus
04/15/2009CN201221313Y Mining outburst prevention fully-mechanized mining face light emulsifiable solution drill
04/15/2009CN101410588A Method of fracturing a coalbed gas reservoir
04/15/2009CN101408112A Low concentration gas thermal convection buoyancy lift collecting device
04/15/2009CN101408090A Indexing for coiled tubing drilling rig
04/08/2009CN101403314A Coal mine down-hole drilling hydraulic fracturing anti-reflection mash gas extraction technique
04/08/2009CN101403313A Use method for extending soft high-pressure rubber hose into drill hole sheath
04/02/2009WO2009039776A1 An exploitation system and method for displacing coal bed gas by mixed gas through a pumping drainage way which is under a well
04/02/2009DE102007046268A1 Fluid medium i.e. gas, filling and emptying method for storage cavern, involves monitoring maximum and minimum static pressure threshold values that respectively exceed and fall such that idle pressure does not exceed values
03/2009
03/18/2009CN201209461Y Multifunction mash gas pumping and discharging sensor
03/18/2009CN201209459Y Abnormal protrusion mine coal road digging anti- protrusion jumbo loader
03/11/2009CN201206471Y Sealing device for pumping borehole
03/11/2009CN101382073A 'Three-soft' low permeability high gas coal seam rapidly digging method
03/11/2009CN100467825C Assembly and disassembly of gas extraction, drainage and discharge driller and displacement auxiliary device thereof
03/04/2009CN201202491Y Pressure expanding seal hole gas extractor
03/04/2009CN201202411Y Low helical abrasion-proof drill rod for mash gas pumping drilling construction
02/2009
02/18/2009EP1573170B1 Method and system for circulating fluid in a well system
02/18/2009CN100462523C Gob-side entry retaining Y-type ventilation goaf top plate pressure relief gas pumping mining method
02/11/2009CN201193534Y Automatic control system for mash gas drill holes
02/11/2009CN201193533Y Secondary hole-sealing device for mash gas drill holes
01/2009
01/28/2009CN201187324Y Gas column hole packer
01/28/2009CN201187323Y Hole locking machine
01/21/2009CN201184213Y Automatic drain slag-discharging apparatus of coal mine down-hole gas pipeline
01/07/2009CN201177137Y Ventilating casing tube for extracting and discharging gas
01/07/2009CN201176849Y Quick high precision positioning device for perforation of boring machine
12/2008
12/31/2008CN201173133Y Coal mine gas explosive-proof suction device
12/31/2008CN201173132Y Automatic water draining apparatus and automatic drainage device for gas pumping pipeline
12/24/2008CN101328791A Method and system for accessing subterranean deposits from the surface
12/17/2008CN201165878Y Negative pressure pipeline automatic drainage device
12/17/2008CN201165877Y Double-float negative pressure automatic drainage device
12/10/2008EP1999340A1 Method of fracturing a coalbed gas reservoir
12/10/2008CN101319615A Goaf gas drainage method of stope working surface of coal mines
12/03/2008CN101315021A Automatic reducing borehole-enlarging drilling tool
11/2008
11/19/2008CN201152248Y Mobile degassing pump station locking device
11/19/2008CN101307695A Coal mine gas pre-draining borehole sealing method adopting aerated capsule as temporary hole bottom
11/12/2008CN201148879Y Mash gas pumping and draining pipeline automatic slag discharging drainage device
10/2008
10/29/2008CN101294500A Heavy pressure slip-casting hole-sealing method for large-diameter extraction borehole
10/29/2008CN101294499A Double-function vacuum apparatus for extracting mash gas and lifting groundwater for coal mine safety
10/22/2008CN201137504Y Negative-pressure pipeline automatic drainage device
10/15/2008CN101285396A Pressure expanded hole-sealing gas extractor
10/08/2008CN201129188Y Mash gas pumping and discharging seal apparatus
10/08/2008CN101280688A Projecting coal bed drift face edge top drilling greater circulation regional eliminating projection method
10/08/2008CN101280687A Projecting coal bed edge top drill construction technique and method for eliminating pumping blind zone
10/08/2008CN101280667A Low helical abrasion-proof drill rod for mash gas pumping drilling construction and machining process thereof
10/08/2008CN101280665A Mash gas pumping drilling orifice expanding bit as well as expanding method thereof
10/01/2008EP1975369A2 Method and system for accessing subterranean deposits from the surface
10/01/2008CN201125747Y Multipurpose type mash gas pumping and placing hole packer
10/01/2008CN101275469A Yolk coal rock formation downward hole pumping and mining pressure relief mash gas construction method
09/2008
09/10/2008CN101260812A Low permeability coal seam artificial resonance wave forepumping technology
08/2008
08/27/2008CN201106454Y Firedamp pipeline slagoff drainage device
08/27/2008CN101251030A Secondary hole sealing method capable of improving coal bed drilling firedamp sucking concentration
08/27/2008CN101251029A Secondary hole sealing device for firedamp taking-out discharging drilling
08/27/2008CN101251028A Method for taking out and picking high gassy seam group dislodging gob-side entry retaining Y type ventilated decompression firedamp
08/21/2008DE102004058983B4 Brandgasanalysesystem für den Einsatz bei Bränden in Steinkohlegruben Fire gas analysis system for use in fires in coal mines
08/20/2008CN201103411Y Helical enhancement type mining pumping wind pipe
08/20/2008CN201103410Y Low-concentration mash gas safety conveying circular stream device
08/20/2008CN201103409Y Low-concentration mash gas safety conveying column stream device
08/20/2008CN201103408Y Fire-proof pressure-relief water and slag discharging device
08/20/2008CN201103407Y Coal mine gas positive-pressure conveying and stable-pressure discharging device
08/20/2008CN201103404Y High-pressure water gas jet current secondary rotating ventilator
08/20/2008CN201103347Y Circular arc shaped rib gas-drawing drilling rod
08/20/2008CN101246364A Double-local fan fault diagnosis and automatic switching closedown integrated device
08/20/2008CN101245706A Three-dimensional simulated experiment bench for coal and mash gas co-extraction
08/13/2008CN201100137Y Tunnel gas disperser
08/13/2008CN101240716A Oxygen-containing mash gas concentration modifying device and uses thereof
08/13/2008CN101240715A One well three-purpose mash gas harnessing method for ground well drilling and ground well drilling
08/06/2008CN101234880A Rock body surface sealing agent for increasing engineering impervious capability and preparing method thereof
07/2008
07/23/2008CN201090239Y High pressure abradant shooting-flow drilling-skiving integration slit anti-projecting equipment
07/23/2008CN201090139Y Press control drill scalpel integration drilling bit
07/16/2008CN101220749A Method for controlling gas of mountain angle and worked-out section by one-in one-out and alternate tail lane ventilation mode
07/09/2008CN100400794C Method and system for accessing substerranean deposits from the surface
06/2008
06/25/2008CN101206027A Method for steady operation of low concentration firedamp gas switching catalytic reaction
06/11/2008CN101196122A Production of water drainage device of firedamp suction pipe
06/04/2008CN201069521Y Dual-power automatic switching intelligent gas control system for mine
05/2008
05/29/2008US20080121399 Method and system for accessing subterranean deposits from the surface
05/28/2008CN201065768Y Automatic slag-discharging water draining device
05/21/2008CN101182783A Method of combined mining caving face using false dipping after high drainage roadway treating gas in beginning mining
04/2008
04/30/2008CN101169042A Caving zone edge inclined drill hole bushing burying method for extracting and discharging gas for goaf and adjacent layer
04/23/2008CN201050382Y Portable friction type hole packer for water injection gas suction
04/23/2008CN201050381Y Spurting-proof device for safe tunneling of protrusive coal bed
04/09/2008EP1552103B1 Drill head steering
04/09/2008CN201045284Y Polygon conical surface matched splicing type auger stem
04/09/2008CN101158286A Coal mine light concentration mash gas safety conveying method and conveying system
04/09/2008CN101158267A Method and system for accessing subterranean deposits from the surface
04/02/2008EP1711684B1 Method for extracting a mine gas in areas which are not directly influenced by mining
03/2008
03/20/2008US20080066903 Method and system for accessing subterranean deposits from the surface and tools therefor
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