EP0002877A2 - Procédé d'extraction du méthane - Google Patents

Procédé d'extraction du méthane Download PDF

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Publication number
EP0002877A2
EP0002877A2 EP78200398A EP78200398A EP0002877A2 EP 0002877 A2 EP0002877 A2 EP 0002877A2 EP 78200398 A EP78200398 A EP 78200398A EP 78200398 A EP78200398 A EP 78200398A EP 0002877 A2 EP0002877 A2 EP 0002877A2
Authority
EP
European Patent Office
Prior art keywords
coal
pressure
cavities
borehole
seam
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.)
Granted
Application number
EP78200398A
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German (de)
English (en)
Other versions
EP0002877B1 (fr
EP0002877A3 (en
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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Filing date
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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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
    • E21B43/25—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 producing methane simultaneously from a plurality of coal seams by forming a column system above and below a certain seam and by means of which at least one at least 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 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.
  • the present invention has for its object to simultaneously extract methane from several seams and coal reefs without the need for a conventional extraction process dig is by forming in the rock package in which they are located, in a manner known per se from the classic underground coal mining, a crevice system through which the seams can degas and then discharging the released gas through at least one borehole.
  • this can be accomplished by drilling at least one borehole from above into a previously determined seam, after which a number of holes can be passed through the borehole or the boreholes and / or with the aid of the borehole or the boreholes Cavities separated by coal peaks are created until the coal peaks remaining between the cavities and the hanging area suddenly collapse under the influence of the static rock pressure, after which the methane released is extracted from the spaces in which there is no high pressure via at least one borehole. " 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 collisions do not collapse at a specific ratio of cavity width and coal collision width. Finally, the pressure is reduced so far that the coal piles collapse and the hanging thing collapses. According to one embodiment of the invention, the intervening coal puffs are destroyed by means of explosives.
  • the remaining excess pressure is preferably below 0.1 MPa.
  • a mining device according to the American patent 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 on Shots arranged in this manner are moved back and forth 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.
  • No generally applicable values can be given for the width of the cavity to be used and the interstices of coal. These depend, among other things, on the composition and the mechanical-physical properties of the overburden up to a few 10 m above the cavity, on the mechanical-physical properties of the coal, on the natural crack formation and on the (hydrostatic) (counter) pressure used.
  • the properties of rock and coal can be determined from the cores of the hole concerned. Then one can, taking into account the depth and the associated static rock pressure and the (hydrostatic) (counter) Pressure to calculate the dimensions to be used. These values can also be determined or controlled empirically.
  • the release of the hydrostatic (counter) pressure can be done in a very simple manner by one or more of the chambers with a gas, for. B. air, methane or nitrogen, drained under pressure through a separate pipe through the borehole. 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 escape and use the crevice system and the collapse area to find a way to the bottom of one or more of the boreholes with a slight excess pressure, and it can then be extracted in almost pure form at the mouth become.
  • the invention takes advantage of the fact that a large number of seams and coal reefs can give off methane through the formation of a fissure system and essentially consists of suddenly forming such a fissure system by e.g. under (hydrostatic) pressure initially 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 with the aid of a drilling rig 2. This borehole is deflected at a certain height via a seam 4 such 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 which was drilled in the plane of the seam 4 is now expanded to a chamber 7a with the aid of 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 drilled deflected and a chamber 7c 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.
  • the width of the chambers and the width of the interposed coals 8a, 8b etc. are calculated in advance taking into account the factors already described, including the hydraulic 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 methane enters the collapse area A, B, C, D can deliver, which can be extracted from there via at least one of the holes 5a, 5b and 5c and the borehole 3 for days.
  • the coal bursts 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 such that it is outside the fracture area of the hollow (s) formed due to the possible deflectability room and is not affected by it.

Landscapes

  • 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)
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
NL7800005A NL7800005A (nl) 1978-01-02 1978-01-02 Werkwijze voor het in situ winnen van methaan uit zich op grote diepte bevindende koollagen.
NL7800005 1978-01-02

Publications (3)

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

Family

ID=19830073

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

Country Status (4)

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

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027678A1 (fr) * 1979-10-19 1981-04-29 Noval Technologies Ltd Procédé de récupération du méthane à partir de couches de charbon
EP0228891A2 (fr) * 1985-12-23 1987-07-15 Canadian Hunter Exploration Ltd. Procédé pour l'équipement d'un puits de production pour la récupération de gaz d'une couche de charbon
CN103046949A (zh) * 2013-01-15 2013-04-17 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
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
CN109630099A (zh) * 2018-10-29 2019-04-16 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
PL424889A1 (pl) * 2018-03-14 2019-09-23 Andrzej Czechowski Sposób odmetanowania górotworu, zwłaszcza w kopalniach węgla

Families Citing this family (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4452489A (en) * 1982-09-20 1984-06-05 Methane Drainage Ventures Multiple level methane drainage shaft method
US4544037A (en) * 1984-02-21 1985-10-01 In Situ Technology, Inc. Initiating production of methane from wet coal beds
US4665990A (en) * 1984-07-17 1987-05-19 William Perlman Multiple-stage coal seam fracing method
US4566539A (en) * 1984-07-17 1986-01-28 William Perlman Coal seam fracing method
US4651836A (en) * 1986-04-01 1987-03-24 Methane Drainage Ventures Process for recovering methane gas from subterranean coalseams
US4978172A (en) * 1989-10-26 1990-12-18 Resource Enterprises, Inc. Gob methane drainage system
US5411098A (en) * 1993-11-09 1995-05-02 Atlantic Richfield Company Method of stimulating gas-producing wells
US5419396A (en) * 1993-12-29 1995-05-30 Amoco Corporation Method for stimulating a coal seam to enhance the recovery of methane from the coal seam
US5417286A (en) * 1993-12-29 1995-05-23 Amoco Corporation Method for enhancing the recovery of methane from a solid carbonaceous subterranean formation
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
US5865248A (en) * 1996-01-31 1999-02-02 Vastar Resources, Inc. Chemically induced permeability enhancement of subterranean coal formation
US5964290A (en) * 1996-01-31 1999-10-12 Vastar Resources, Inc. Chemically induced stimulation of cleat formation in a subterranean coal formation
US5967233A (en) * 1996-01-31 1999-10-19 Vastar Resources, Inc. Chemically induced stimulation of subterranean carbonaceous formations with aqueous oxidizing solutions
US5669444A (en) * 1996-01-31 1997-09-23 Vastar Resources, Inc. Chemically induced stimulation of coal cleat formation
US5944104A (en) * 1996-01-31 1999-08-31 Vastar Resources, Inc. Chemically induced stimulation of subterranean carbonaceous formations with gaseous oxidants
PL365462A1 (en) * 2000-04-11 2005-01-10 Welldog, Inc. In-situ detection and analysis of methane in coal bed methane formations with spectrometers
US6412556B1 (en) 2000-08-03 2002-07-02 Cdx Gas, Inc. Cavity positioning tool and method
US6824224B1 (en) * 2002-06-19 2004-11-30 Cimarron Technology, Ltd. Coalbed methane extraction process
DE10242775A1 (de) * 2002-09-14 2004-04-08 Alstom (Switzerland) Ltd. Verfahren zum Betrieb einer Abgasreinigungsanlage sowie Vorrichtung zur Durchführung des Verfahrens
US7051809B2 (en) * 2003-09-05 2006-05-30 Conocophillips Company Burn assisted fracturing of underground coal bed
US7163063B2 (en) 2003-11-26 2007-01-16 Cdx Gas, Llc Method and system for extraction of resources from a subterranean well bore
US7419223B2 (en) * 2003-11-26 2008-09-02 Cdx Gas, Llc System and method for enhancing permeability of a subterranean zone at a horizontal well bore
US20060201715A1 (en) * 2003-11-26 2006-09-14 Seams Douglas P Drilling normally to sub-normally pressured formations
US20060201714A1 (en) * 2003-11-26 2006-09-14 Seams Douglas P Well bore cleaning
US7225872B2 (en) * 2004-12-21 2007-06-05 Cdx Gas, Llc Perforating tubulars
AU2005319151B2 (en) * 2004-12-21 2010-05-27 Cdx Gas, L.L.C. Enlarging well bores having tubing therein
US7182157B2 (en) * 2004-12-21 2007-02-27 Cdx Gas, Llc Enlarging well bores having tubing therein
US7353877B2 (en) * 2004-12-21 2008-04-08 Cdx Gas, Llc Accessing subterranean resources by formation collapse
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
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
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR964503A (fr) * 1950-08-18
US3814480A (en) * 1973-03-23 1974-06-04 Continental Oil Co Method of controlling gas accumulation in underground mines
DE2434408A1 (de) * 1973-07-17 1975-02-13 Eek Wouter Hugo Van Verfahren und vorrichtung zur gewinnung von mineralien
US3934649A (en) * 1974-07-25 1976-01-27 The United States Of America As Represented By The United States Energy Research And Development Administration Method for removal of methane from coalbeds
FR2338987A1 (fr) * 1976-01-22 1977-08-19 Exxon Research Engineering Co Procede de recuperation d'hydrocarbures a partir de charbon

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1559316A (fr) * 1967-07-10 1969-03-07
US3650564A (en) * 1970-06-15 1972-03-21 Jacobs Associates Mining method for methane drainage and rock conditioning
US3743353A (en) * 1971-12-20 1973-07-03 P Lupinsky Modified l furniture structure
US3961824A (en) * 1974-10-21 1976-06-08 Wouter Hugo Van Eek Method and system for winning minerals
US4089374A (en) * 1976-12-16 1978-05-16 In Situ Technology, Inc. Producing methane from coal in situ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR964503A (fr) * 1950-08-18
US3814480A (en) * 1973-03-23 1974-06-04 Continental Oil Co Method of controlling gas accumulation in underground mines
DE2434408A1 (de) * 1973-07-17 1975-02-13 Eek Wouter Hugo Van Verfahren und vorrichtung zur gewinnung von mineralien
US3934649A (en) * 1974-07-25 1976-01-27 The United States Of America As Represented By The United States Energy Research And Development Administration Method for removal of methane from coalbeds
FR2338987A1 (fr) * 1976-01-22 1977-08-19 Exxon Research Engineering Co Procede de recuperation d'hydrocarbures a partir de charbon

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
Mai 1975, Seiten 75-80 PERROTTE & QUINQUET. "Introduction du "Trackless" aux mines de Soumont". *
ZEITSCHRIFT "COAL AGE", Vol. 80, No. 8, Juli 1975 New York, U.S.A. MAURICE DEUL: "Speeding coal mining operations by recovering and utilising methane from coal beds", Seiten 104-106. *
ZEITSCHRIFT ANNALES DES MINES, Mai 1975, Zeilen 27-48 Paris E. TINCELIN. "Les mines de fer de Lorraine. Les resultats de l'experience et les perspectives d'avenir. * Seite 30, II.3.1. * *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027678A1 (fr) * 1979-10-19 1981-04-29 Noval Technologies Ltd Procédé de récupération du méthane à partir de couches de charbon
EP0228891A2 (fr) * 1985-12-23 1987-07-15 Canadian Hunter Exploration Ltd. Procédé pour l'équipement d'un puits de production pour la récupération de gaz d'une couche de charbon
EP0228891A3 (en) * 1985-12-23 1988-09-14 Canadian Hunter Exploration Ltd. Method of completing production wells for the recovery of gas from coal seams
CN103046949A (zh) * 2013-01-15 2013-04-17 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
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
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
PL424889A1 (pl) * 2018-03-14 2019-09-23 Andrzej Czechowski Sposób odmetanowania górotworu, zwłaszcza w kopalniach węgla
CN109630099A (zh) * 2018-10-29 2019-04-16 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
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

Also Published As

Publication number Publication date
DE2860925D1 (en) 1981-11-05
EP0002877B1 (fr) 1981-08-05
NL7800005A (nl) 1979-07-04
EP0002877A3 (en) 1979-08-08
US4245699A (en) 1981-01-20

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