EP0002877B1 - Procédé d'extraction du méthane - Google Patents

Procédé d'extraction du méthane Download PDF

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Publication number
EP0002877B1
EP0002877B1 EP78200398A EP78200398A EP0002877B1 EP 0002877 B1 EP0002877 B1 EP 0002877B1 EP 78200398 A EP78200398 A EP 78200398A EP 78200398 A EP78200398 A EP 78200398A EP 0002877 B1 EP0002877 B1 EP 0002877B1
Authority
EP
European Patent Office
Prior art keywords
coal
pressure
cavities
borehole
process according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP78200398A
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German (de)
English (en)
Other versions
EP0002877A3 (en
EP0002877A2 (fr
Inventor
Johannes Wilhelmus Maria Steeman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stamicarbon BV
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Stamicarbon BV
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Publication date
Application filed by Stamicarbon BV filed Critical Stamicarbon BV
Publication of EP0002877A2 publication Critical patent/EP0002877A2/fr
Publication of EP0002877A3 publication Critical patent/EP0002877A3/xx
Application granted granted Critical
Publication of EP0002877B1 publication Critical patent/EP0002877B1/fr
Expired legal-status Critical Current

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    • 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
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • E21B43/2605—Methods for stimulating production by forming crevices or fractures using gas or liquefied gas
    • 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
    • E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
    • E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well

Definitions

  • the invention relates to a method for the production of methane simultaneously from a plurality of coal seams forming a seam bundle, in that a column system is formed in the rock layers lying between the seam layers above and below a specific seam lying within the seam bundle and from the specific seam with the aid of at least one at least one partially cased borehole methane is discharged.
  • the amount of methane that is released in this way and can be partially recovered is usually a multiple of the amount of methane that will come from the mined seam itself. This is possible because there are other seams and coal corrugations in the cracked rock package above and below, each of which releases a certain amount of methane via the column system. If the geological structure of the seam bundle is known, a number of parameters - mostly changing for each field - can be used to calculate exactly how much methane is expected to be released via the column system (see, among others, Geologie en Mijnbouw, 41, 1962, pp. 55 to 57 ).
  • An advantage of the recovery of methane present in seams is that it is released in almost pure form and can be recovered as such; this is in contrast to the gas that is generated when coal is burned in situ.
  • page 104-106 describes how to drill several holes in the seam plane to free the methane from the seam, which methods are useful for degassing a single seam, but if there are many seams, these methods are used the frequent repetition of the same procedure is very time-consuming.
  • the object of the present invention is to extract methane simultaneously from a plurality of seams and coal reefs which form a seam package, without the need for a conventional extraction method, in that the rock package in which they are located is based on one from the classic underground coal mining known manner forms a column system through which the seams can degas and the gas released finally discharges through at least one borehole.
  • this can be accomplished by drilling at least one well from above the surface into the previously determined seam, after which in the seam concerned by means of the borehole or the boreholes or with the aid of through the borehole or the boreholes into the seam introduced means for loosening the coal a number of cavities separated by coal peaks is generated until the coal piles remaining between the cavities and the hanging area suddenly collapse under the influence of the static rock pressure, after which from the cavities and crevices in which a pressure which is below the original methane pressure in the seams is maintained, the released methane is obtained through the borehole (s). “ suddenly” is understood to mean that the hanging part collapses within a few minutes to about a day.
  • the cavities are preferably under a pressure which forms a counterpressure to the static rock pressure, in such a way that the coal bursts do not collapse at a specific ratio of the cavity width and the coal pile width.
  • the pressure is reduced to such an extent that the coal piles collapse and the hanging part collapses.
  • the coal puffs remaining between the cavities are destroyed by means of explosives.
  • the cavities are caused by partial combustion of the coal, dissolution (see, for example, US Pat. No. 4,032,193) and the like. Like. Can form, these methods are less suitable because of the conditions to be met for it. So you need quite a lot of boreholes, and the required dimensions of the cavities and coal piles are less easy to control. It is preferable to work in such a way that the cavities are generated under hydraulic back pressure.
  • a mining device according to DE-A-2 434 408 or the corresponding US-A-3 961 824 or embodiments derived therefrom is very well suited for this.
  • the device consists of a scraper system with shots that are inserted into the borehole when stretched and arranged in a zigzag shape.
  • the shots arranged in this way are moved back and forth hydraulically or mechanically so that the scratches (or other means for releasing the coal) located on the joints of the shots can detach the wall of the borehole and thus the coal.
  • the coal thus released is discharged through the same borehole with the help of flushing liquid.
  • the length and width of the part of the room whose coal is mined in this way can be adjusted.
  • the lifting of the hydrostatic (counter) pressure can be done in a very simple manner by one or more of the chambers filled with the liquid with a gas, for. B. air, methane or nitrogen, emptied through a separate line through the borehole under pressure. It is necessary that the collapse area that forms is drained as well as possible so that the pressure is so low that the seams can release the adsorbed gas as completely as possible. Of course, it is also possible to pump out the existing water in a different way using means known from the oil industry, if necessary through a separate borehole. It is also necessary to keep the collapse area water-free continuously or discontinuously if it is connected to a natural water inflow.
  • a gas for. B. air, methane or nitrogen
  • the methane adsorbed in the seams and coal reefs will emerge with a slight overpressure and look for a way to the bottom of one or more of the boreholes via the crevice system and the collapse area, and it can then be obtained in almost pure form at the mouth .
  • the invention takes advantage of the fact that a large number of seams and coals corrugation can form methane through the formation of a column system, and essentially consists in suddenly forming such a column system by e.g. B. under (hydrostatic) pressure first forms a cavity system made up of chambers and pillars and this suddenly collapses when the pillars collapse.
  • a borehole 3 is drilled from the earth's surface 1 using a drilling rig 2. This borehole is deflected to a certain height above a seam 4 in such a way that a part 5a of the borehole 3 strikes the seam 4 at a small angle at a point 6a, after which drilling continues in the plane of the seam 4. The part that was drilled in the level of seam 4 becomes.
  • a chamber 7a using the system already described or another system.
  • the length of this chamber 7a of which the front surface shows a cross section in the drawing, can be several 100 m long.
  • a second borehole 5b is then drilled in a known manner from the borehole 3 and expanded into a chamber 7b in the plane of the seam 4.
  • a third part 5c is drilled in a deflected manner and a chamber 7c is created.
  • a lot of chambers can be formed around the borehole 3. All of this happens under possibly increased hydrostatic pressure to prevent premature collapse.
  • collars 8a and 8b there are collars 8a and 8b and possibly other collisions and chambers, not shown.
  • the width of the chambers and the width of the intermediate coal bursts 8a, 8b etc. are calculated in advance taking into account the factors already described, including the hydrostatic pressure used.
  • this collapse area which can have a length and a width of several 100 m, the column system already described forms, through which a seam 9 can release methane into the collapse area A, B, C, D, which from there on at least one of the holes 5a, 5b and 5c and can be extracted over the hole 3 for days.
  • the coal puffs can spontaneously decay even under the influence of the methane adsorbed in the coal and release the gas, in analogy to the sudden outbursts of firedamp (see Geologie en Mijnbouw, 41, 1962, p. 79 ff).
  • the borehole 3 can be arranged in such a way that, owing to the possible deflectability, it lies outside the fracture area of the cavity (s) formed and is not impaired thereby.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Piles And Underground Anchors (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Claims (13)

1. Procédé d'extraction du méthane de plusieurs couches de charbon à la fois - lesquelles couches constituent un paquet - en réalisant au-dessus et au-dessous d'une couche déterminée, située à l'intérieur dudit paquet, un système de fentes dans les bancs de résistance situés entre les couches et en extrayant le méthane à partir d'une couche déterminée à l'aide d'un trou de forage au moins partiellement tubé, caractérisé en ce que, depuis le carreau de la mine jusque dans la couche (4) choisie au préalable à cet effet, on réalise au moins un trou de forage (3, 5), puis on forme dans la couche concernée (4), par le (les) trou(s) de forage (5) (5a, b, c) et à l'aide de moyens pour abattre le charbon - introduits dans le(s) trou(s) de forage - un certain nombre d'espaces vides (7a, b, c), séparés par des parois de charbon, jusqu'à ce que les parois de charbon et le toit s'écroulent brusquement sous l'influence de la pression du terrain, et ensuite on récupère par le(s) trou(s) de forage (3) le méthane dégagé des espaces vides et des fentes, dans lesquels on maintient une pression inférieure à la pression initiale du méthane dans les couches de charbon.
2. Procédé selon la revendication 1, caractérisé en ce que, dans les espaces vides formes, on maintient une pression qui constitue une contrepression par rapport à la pression statique de la roche de telle façon que les parois de charbon ne s'écroulent pas pour un rapport déterminé entre la largeur des espaces vides et la largeur des parois de charbon intermédiaires et, les espaces vides étant achevés, on abaisse la contrepression jusqu'à ce que les parois de charbon et le toit s'écroulent.
3. Procédé selon l'une des revendications 1 et 2, caracterisé en ce que la surpression dans les espaces vides est, après l'emboulement, inférieure à 0,1 MPa.
4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que la contrepression est une pression hydrostatique.
5. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que les espaces vides sont formés par une combustion partielle ou une dissolution du charbon.
6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que les espaces vides sont formés à l'aide de racloirs ou de scrapers introduits par le trou de forage et mis en mouvement par voie mécanique.
7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que la largeur des espaces vides et celle des parois de charbon, qui séparent ces espaces vides, sont déterminées à l'aide de la composition et des propriétés mécaniques-physiques du toit jusqu'à quelques dizaines de mètres au-dessus des espaces vides, ainsi que des propriétés mécaniques-physiques du charbon, de la fissuration naturelle et de la (contre)-pression appliquée.
8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que les propriétés de la roche et du charbon sont déterminées à l'aide des carottes de forage et que les dimensions à utiliser sont calculées en tenant compte de la profondeur et de la pression statique de la roche, qui en découle, ainsi que de la (contre)-pression à appliquer.
9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que la pression hydrostatique est remplacée d'abord, au moyen d'une conduite séparée à travers le trou de forage, par une pression de gaz, qui est ensuite abaissée.
10. Procédé selon l'une des revendications 1 à 9, caractérisé en ce que la région d'éboulement formée est drainée.
11. Procédé selon l'une des revendications 1 à 10, caractérisé en ce que l'on prévoit un trou de forage supplémentaire pour le drainage.
12. Procédé selon l'une des revendications 1 à 11, caractérisé en ce que l'on fait déboucher le même trou de forage dans plusieurs paquets de couches de charbon.
13. Procédé selon l'une des revendications 1 à 12, caractérisé en ce que les parois de charbon se trouvant entre les espaces vides sont abattues à l'aide d'explosifs.
EP78200398A 1978-01-02 1978-12-30 Procédé d'extraction du méthane Expired EP0002877B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7800005 1978-01-02
NL7800005A NL7800005A (nl) 1978-01-02 1978-01-02 Werkwijze voor het in situ winnen van methaan uit zich op grote diepte bevindende koollagen.

Publications (3)

Publication Number Publication Date
EP0002877A2 EP0002877A2 (fr) 1979-07-11
EP0002877A3 EP0002877A3 (en) 1979-08-08
EP0002877B1 true EP0002877B1 (fr) 1981-08-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP78200398A Expired EP0002877B1 (fr) 1978-01-02 1978-12-30 Procédé d'extraction du méthane

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US (1) US4245699A (fr)
EP (1) EP0002877B1 (fr)
DE (1) DE2860925D1 (fr)
NL (1) NL7800005A (fr)

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US5400856A (en) * 1994-05-03 1995-03-28 Atlantic Richfield Company Overpressured fracturing of deviated wells
US5474129A (en) * 1994-11-07 1995-12-12 Atlantic Richfield Company Cavity induced stimulation of coal degasification wells using foam
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US5944104A (en) * 1996-01-31 1999-08-31 Vastar Resources, Inc. Chemically induced stimulation of subterranean carbonaceous formations with gaseous oxidants
US5669444A (en) * 1996-01-31 1997-09-23 Vastar Resources, Inc. Chemically induced stimulation of coal cleat formation
US5964290A (en) * 1996-01-31 1999-10-12 Vastar Resources, Inc. Chemically induced stimulation of cleat formation in a subterranean coal formation
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CN103046949B (zh) * 2013-01-15 2014-11-19 中国矿业大学 一种偏置气液两相射流割缝增透装置及方法
CN103267984B (zh) * 2013-05-28 2015-11-25 山东科技大学 一种极近距离煤层/群的判别方法
CN106644732B (zh) * 2016-10-14 2023-12-05 宋世元 顶板垮落监测试验系统
CN106640020A (zh) * 2016-11-24 2017-05-10 安徽理工大学 高瓦斯低透气性煤层增加煤层透气性的方法
CN107083961B (zh) * 2017-05-10 2019-04-26 中国矿业大学 基于压裂圈的强地压巷道应力转移方法
PL424889A1 (pl) * 2018-03-14 2019-09-23 Andrzej Czechowski Sposób odmetanowania górotworu, zwłaszcza w kopalniach węgla
CN109630099B (zh) * 2018-10-29 2021-07-27 中国矿业大学 一种煤层气水平井塌孔造洞穴卸压开采模拟试验方法
CN112593911B (zh) * 2020-12-14 2022-05-17 山西晋城无烟煤矿业集团有限责任公司 一种煤矿地面水平井分段动力掏煤扩径方法
CN112593912B (zh) * 2020-12-14 2022-05-17 山西晋城无烟煤矿业集团有限责任公司 一种煤层气水平井动力扩径卸压增透抽采方法

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Also Published As

Publication number Publication date
EP0002877A3 (en) 1979-08-08
US4245699A (en) 1981-01-20
DE2860925D1 (en) 1981-11-05
NL7800005A (nl) 1979-07-04
EP0002877A2 (fr) 1979-07-11

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