Classifications

• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
  • E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
  • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
  • E21B43/006—Production of coal-bed methane

Definitions

• the invention relates to a method for mine gas extraction outside the usual limiting the sink trough influence or influence of mining activities over days and within a critical angle for mine gas circulation in the coal mountains and thus to avoid a greenhouse effect supporting gas release encountered in the wells in the mountain areas and then the mine gas is sucked off.
• gas and methane can be extracted from seams and secondary layers in the coal mountains.
• methods are known in which the mine gas is sucked out of the hanging ends and horizontal ends of the seam in quarrying by means of boreholes of different lengths.
• the extraction of the mine gas is mainly carried out in this area to effectively reduce the risk of gas explosions.
• By means of the vacuum present in the gas collecting lines it is possible to extract a gas-air mixture, which can often be used as an energy carrier in the area of the shaft systems themselves.
• the usual diameter of such gas wells is 95 mm.
• the average length is 50 to 60 m with a hole spacing of 15 to 30 m in the mining routes.
• the object is achieved according to the invention in that the boreholes are first pushed vertically into the mountains and then selectively deflected and oriented so that considered as a result of the degradation effects in this area or resulting gas circulation paths considered perpendicular to diagonal both in stroke and in the direction of incidence to be pierced.
• the invention makes it possible, through the orientation of the corresponding boreholes or boreholes, that it utilizes the fact that, although the usual influence or influence angle, which as a rule is between 50 gon and 100 gon, limits the damage to the surface for days, but that the degradation effects also act and asymptotically go to zero, which in particular relates to the gas pathway in the mountains or the resulting gas circulation paths.
• the subsidence detected or produced in the area of the influence or influence angle is of interest for the process in that it causes inclinations and curvatures and horizontal strains and compressions as well as vertical elongations and compressions.
• Essential for the circulation of the mine gas and the orientation of the wells for the extraction of the mine gas are mainly the horizontal strains and vertical stretches of the mountains, because they open the fractures and shearing and degradation conditional cracks and scroll the layer surfaces above the degradation advantageous.
• convex curvatures occur outside or to the side of the excavation, which are an occasion for gas circulation-relevant distortions of the mountains.
• Strains and strains can be artificially gas trails or Gaszirkulationswege arise that are exploited by the method according to the invention and used for mine gas production, especially between the critical angle for mining action days, ie in the region of the lowering trough and the critical angle for mine gas circulation due reduction or miner's activity.
• the invention further takes into account that initially above the degradation, gas-circulation-relevant delaminations and, in addition to the degradation, distortions occur.
• the mine gas is pressed with the fading of the exfoliation to the side in the local Zerrungs Scheme. This range goes far beyond the angle of exposure, which accounts for approximately 99% of subsidence. With this angle of action, 92% of the strains and compressions as well as the curvatures are detected, but they are relevant for the gas circulation paths, which also push the gas into the area outside the influence and influence angle of the degradation.
• the environmental impact is limited not only to the time during the mining of hard coal, but also to the time thereafter, because the fractures, shear surfaces and cracks remain open as long as there is no degradation below or in the vicinity, in which the circulation paths are pressed.
• a further advantage is that once the circulation paths for the mine gas widened once more occur more or less vertically and are not pressed by the overlay pressure. This makes it possible for the entire period, using the method according to the invention to suck the environment otherwise polluting mine gas and harness.
• the boreholes are oriented outside or within the critical angle for mine gas circulation and deflected as horizontally and above the level of degradation.
• the placement of the wells outside the action or angle of influence of the mining operations has the advantage that the wells can stand long enough to be available for mine gas production. Therefore, they are usually produced within the critical angle for the mine gas circulation, more rarely outside this critical angle. They are first introduced vertically into the ground, then selectively deflected towards degradation and thus reach the area of the gas circulation paths.
• the boreholes are oriented in horizontal target areas in the direction of excavation or in the opposite direction, the direction essentially depending on where the vertical borehole has been pushed. It is important that in this way the perpendicular and formed by the degradation gas circulation paths are approached and traversed. Accordingly, a further development provides that the drilled holes in
• Degradation in hard coal mining essentially affects the rock areas above the mining area, so that the invention makes sense to provide for the boreholes to be routed through the ongoing and / or planned mining to ensure that the gas flows in here.
• the repeatedly mentioned lowering trough or the action or influence angle of the degradation effects is the starting point of the exfoliation, so it is useful if the holes are arranged perpendicular or diagonal to the direction of degradation or are deflected so that they get into this area exactly.
• the circulation paths are pierced more or less vertically to diagonally in both strike and incidence directions. This makes it possible to gain the mine gas also laterally of the mining areas between the usual influence angle for the requirements of mining damage processing, ie between the so-called sink trough and the critical angle for mine gas circulation.
• the individual seams are divided into mining strips. This takes into account the process insofar as the boreholes are oriented in such a way that the division of the excavation surface into several excavation operations / removal strips is taken into account.
• the boreholes are oriented such that the individual removal strips form a unit or that two or more removal strips form a unit.
• the invention provides that the exhausted mine gas is supplied to the power supply, which is also optimally possible because relatively pure mine gas can be recovered with high percentages and indeed with well over 50% methane in the methane-air mixture.
• the invention is characterized in particular by the fact that taking into account the existing conditions not only mine gas is recovered in the area of the mining itself, but also in the neighboring areas, which were previously completely disregarded for mine gas production.
• environmental pollution can be significantly reduced or even completely avoided, because it is also possible to gain in the areas of mine gas, into which the mine gas due to the degradation effects has been migrated and possibly stored for a long time, which was previously completely disregarded.
• These areas are up to about 18 gon. It is therefore a much larger area than the recognizable by the sink trough area.
• the mine gas production possible according to the method serves mercantile purposes but above all also environmental protection. Essential here is the economy achieved, which is achieved in particular by the fact that the holes or holes produced cut through the targeted gas circulation paths and thus allow a win-in of stored there large amounts of gas.
• Figure 1 shows a schematically reproduced mining operation with critical angles.
• the distortion range is well beyond that of the angle of impact, which accounts for 99% of the subsidence. With this angle of action 5, only 92% of the strains and compressions and the curvatures are detected. Added to this are 88% of the compressions and dilations.
• inventive orientation of the holes 9, 10 for mine gas production between the influence and influence angle 5 and the critical angle 6 for the mine gas circulation as a result of the mining activity is exploited by the invention of the fact that the mountain movements in the form of the degradation of the generally valid law of the lowest energy consumption. After that happens what makes the least amount of energy required.
• the orientation of the boreholes 9, 10 for mine gas production outside the usual influence angle 5 for the mining damage processing notes that curvatures in the mountains 1 lead to shifts of rock material towards mining. The same happens due to the trend that the mountains 1 migrate in the direction of degradation and indeed decreasing with increasing distance to the degradation, which then leads to strains as in the curvature.
• the strains are labeled 12, the strains 11.
• the fractured fractures, shearing surfaces and cracks, which are present between the angle of action 5 and the angle of action or limit angle 6, are used to migrate the CMM, distributed over large areas, into the atmosphere.
• the Kyoto Protocol comes into play, because this mine gas pollutes the environment, which now no longer occurs when using the method according to the invention, because it is obtained in good time and made usable.
• the environmental relief is not limited only to the time during the mining of hard coal, but extends to a large period thereafter.
• the strains within the range between angles 5 and 6 point toward disassembly. As a result, those fractures, cuttings and cracks that are perpendicular to this direction of strain are artificially opened and important for mine gas circulation and mine gas production.
• the corresponding orientation of the boreholes 9, 10 uses in the above context that due to the large spatial distance from the initiating degradation, the artificially widened circulation paths are more or less perpendicular. They are not affected by the overlay pressure, so they are fully available for the mine gas recovery steps that are important for economic and environmental protection. Conveniently, the deflected borehole 10 is guided against the degradation direction 8, so that the gas circulation paths are cut more or less perpendicularly to diagonally or pierced. All mentioned features, including those of the drawing to be taken alone, are considered to be essential to the invention alone and in combination.

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• Engineering & Computer Science (AREA)
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• Physics & Mathematics (AREA)
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• 2004
  • 2004-01-23 DE DE102004003486A patent/DE102004003486A1/de not_active Withdrawn
• 2005
  • 2005-01-21 EP EP05714885A patent/EP1711684B1/fr not_active Expired - Lifetime
  • 2005-01-21 PL PL05714885T patent/PL1711684T3/pl unknown
  • 2005-01-21 AT AT05714885T patent/ATE391226T1/de not_active IP Right Cessation
  • 2005-01-21 WO PCT/DE2005/000079 patent/WO2005071226A1/fr not_active Ceased
  • 2005-01-21 DE DE502005003556T patent/DE502005003556D1/de not_active Expired - Lifetime

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