EP0197566B1 - Verfahren zur kontrollierten Rückziehung des Einführungspunktes in die Lagerstätte bei der Untertagevergasung von Kohle - Google Patents

Verfahren zur kontrollierten Rückziehung des Einführungspunktes in die Lagerstätte bei der Untertagevergasung von Kohle Download PDF

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Publication number
EP0197566B1
EP0197566B1 EP86200119A EP86200119A EP0197566B1 EP 0197566 B1 EP0197566 B1 EP 0197566B1 EP 86200119 A EP86200119 A EP 86200119A EP 86200119 A EP86200119 A EP 86200119A EP 0197566 B1 EP0197566 B1 EP 0197566B1
Authority
EP
European Patent Office
Prior art keywords
injection
point
coal
gasification
gasifying agents
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
EP86200119A
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English (en)
French (fr)
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EP0197566A1 (de
Inventor
Pierre Ledent
Claus Sonntag
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.)
Institution Pour Le Developpement de la Gazeification Souterraine
Original Assignee
Institution Pour Le Developpement de la Gazeification Souterraine
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Institution Pour Le Developpement de la Gazeification Souterraine filed Critical Institution Pour Le Developpement de la Gazeification Souterraine
Priority to AT86200119T priority Critical patent/ATE41471T1/de
Publication of EP0197566A1 publication Critical patent/EP0197566A1/de
Application granted granted Critical
Publication of EP0197566B1 publication Critical patent/EP0197566B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • E21B43/243—Combustion in situ
    • 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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
    • E21B33/138—Plastering the borehole wall; Injecting into the formation
    • 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
    • E21B34/00—Valve arrangements for boreholes or wells
    • E21B34/06—Valve arrangements for boreholes or wells in wells
    • 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
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • E21B43/243—Combustion in situ
    • E21B43/247—Combustion in situ in association with fracturing processes or crevice forming processes
    • 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

  • these boreholes In order to resist ground pressure, these boreholes must be provided with solid coatings and these coatings must not simultaneously undergo the effect of high temperatures and the stresses resulting from the lithostatic pressure. This condition can be satisfied by the use of conventional metallic casings, if a retracting operating method is adopted in which, for the entire duration of their use, the probes are used to inject gasifying agents at low temperature.
  • the arrangements adopted must also ensure as intimate contact as. possible between gasifying agents and coal, this condition being essential for the production of good quality gas.
  • Patent GB-A-2004297 A describes a process for retreating operation, in which the intimate contact between the gasifying agents and the coal is obtained by the methodical backfilling of the zones already gasified, the backfill material being a granulated material transported pneumatically to through the boreholes used for the injection of gasifying agents.
  • Patent US-A-4 334 579 describes a process for retreating operation, in which intimate contact between the gasifying agents and the coal is obtained without the addition of fill, by periodically carrying out the controlled retraction of the point of injection of the agents gasifiers, in such a way that a sufficiently large quantity of virgin coal remains permanently present between the point of injection of the gasifying agents and the zones already gasified ...
  • the injection of the gasifying agents is carried out by long boreholes drilled in the thickness of the layer, the injection point being moved gradually from the end of the borehole to its point d Originally using a retractable or heat degradable injection tube for this purpose.
  • the present invention relates to a new method of retraction of the point of injection of the gasifying agents, injected into long vein probes.
  • the retraction of the injection point does not result from the destruction or the retraction of the tube used for the injection of the gasifying agents, but it is obtained by progressive obturation of the terminal part of this tube, by pneumatic injections of sand or other materials. inert granules, added with a thermosetting binder.
  • the method according to the invention can be applied according to two variants.
  • the progressive obturation of the end portion of the tube for injecting the gasifying agents is obtained by injecting into the current gasifying agents of sand or other inert granular materials added with a thermosetting binder, introduced in the gasifier and pneumatically transported supply line.
  • the progressive closure of the end portion of the gasifier injection tube is obtained by closing valves, arranged at regular intervals inside the gasifier injection tube, this closure being controlled by devices which react to the rise in temperature resulting from the progression of the gasification front.
  • layer 1 located in a virgin deposit more than 800 meters deep, is intersected by a deviated borehole with large radius 2, which is extended by a rectilinear section from 200 meters to 300 meters in length, drilled into the thickness of the layer.
  • a vertical borehole 3 intersects the same layer, near the end of borehole 2.
  • the two boreholes are coated with casings connected to the rocks by cementation.
  • the two boreholes are coated with perforated casings (liners) which allow the passage of gases, while opposing the creep of the coal.
  • the casing of borehole 2 is closed at its end (point 5).
  • Hole 2 is intended for the injection of gasifying agents and Hole 3 for the recovery of the gas produced.
  • the operation begins by igniting the coal, at the bottom of the borehole 3, using one of the known methods for this purpose: self-ignition of the coal by injection of hot air, by injection of air enriched with oxygen or through the use of auto-flammable chemicals such as silane or triethylborane.
  • the combustion of the coal is maintained around the well 3, alternating periods of air injection, at a pressure higher than the minimum fracturing pressure of the deposit, and periods of decompression of the well, to the evacuation of combustion gases.
  • This first operation has the result of creating, around the well 3, a scree zone 4, of great permeability, which corresponds to the vacuum produced by the combustion of the coal and filled by the abundance of coal located on the periphery and by the rock fall from the layer roof.
  • connection between boreholes 2 and 3 is carried out by backburning, by injecting through borehole 2 an oxygenating gasifying agent such as: air, oxygen mixture + water vapor or oxygen mixture + C0 2 .
  • an oxygenating gasifying agent such as: air, oxygen mixture + water vapor or oxygen mixture + C0 2 .
  • the pressures prevailing at the bottom of boreholes 2 and 3 are controlled by direct measurement or by a calculation taking into account the pressures measured at the surface, the flow rates in circulation and the pressure drops in the two wells.
  • the point of retraction is carried out injection of the gasifying agents by sealing the terminal part of the borehole 2.
  • a pressure silo 6 containing a reserve of granulated materials, and a cellular distributor 7, whose rotation makes it possible to inject these granulated materials into the flow of gasifying agents.
  • the reduction in the difference between the pressures measured at the bottom of boreholes 2 and 3 causes the alveolar distributor to move and the injection of a first quantity of granulated materials.
  • This first quantity injected reaches the bottom of the borehole a few tens of seconds later and a new movement of the alveolar distributor is triggered if, at this time, the difference between the two pressures has not yet reached its setpoint.
  • the circulation of the gasifying agents, between point 8 and the cavity 4, is done by filtration through the carbon, benefiting from the increase in permeability which results from the creep of the carbon, in the direction of the empty spaces.
  • the gasification front progresses from the cavity 4, moving against the flow direction of the gasifying agents. This mode of operation has the effect of ensuring the production of a high quality gas, thanks to the large development of gas-solid contact surfaces and to the very uniform dispersion of the flow of gasifying agents.
  • the operation of the granulated material dispenser can be made fully automatic by the use of a microprocessor whose program provides, at any time, the value of the difference between the pressures prevailing at the bottom of wells 2 and 3.
  • the granulated materials injected consist, for the most part, of inert materials such as: sand, corundum or glass powder.
  • inert materials such as: sand, corundum or glass powder.
  • a thermosetting material chosen from the range of epoxy resins or from any other range of chemicals with equivalent characteristics. This addition can be carried out by mixing inert grains and granules of resinous material or by coating the inert grains in a thin layer of resin.
  • the casing of the borehole, in the part drilled in the thickness of the layer is divided into elements a few meters in length.
  • Figure 3 shows a middle section through one of these elements.
  • the casing can be closed by the displacement of the valve head 9, which comes to rest on the valve seat 10.
  • the closing of the valve is caused by the pressure of the spring 11, which acts on the tail of valve 12.
  • valve In the absence of any rise in temperature, the valve is held, in the open position, by the rod 13, which slides inside the sheath 14 but whose displacement is prevented by the presence of the plug 15.
  • this plug In the center of this plug is a fusible cylinder, made of an alloy of lead and tin, the melting point of which is around 200 ° C to 300 ° C.
  • the rise in temperature causes the fusible cylinder to melt. Consequently, the rod 13 can slide freely in the sheath 14 and this releases the valve, which closes under the action of the spring 11.
  • the sheath 14 is held in the axis of the casing by one or more centralizers, such as 16.
  • Each element of the casing has a perforated part 17 and one or more packers such as 18, made up of flexible strips of metal or plastic, which can move apart under the effect of pressure and seal between the outer wall of the casing and the coal which constitutes the inner wall of the borehole.
  • FIG. 4 illustrates the use of the second variant of the method.
  • the operation begins by igniting the coal at the bottom of borehole 3 and by creating, around this borehole, a scree zone 4 of high permeability
  • connection between probes 2 and 3 is carried out by back-combustion, by injecting - through probe 2, an oxygen-based gasifying agent.
  • the gasifying agent is injected through the perforated part of the last casing element.
  • the heat released by the back-combustion operation causes a temperature rise in the coal located in the vicinity of the reaction zone and this temperature rise propagates, in front of the reaction front, progressing from well 3 towards well 2.
  • the fusible cylinder located at the end of the last casing element melts, which causes the valve 19 to close. , located at the upstream end of this element. From this moment the gasifying agent is injected into the vein through the perforated part of the fore-casing element.
  • the fusible cylinder located at the end of the Savant-last casing element in turn melts, which causes the valve 20 to close.
  • FIG. 5 illustrates the use of the method according to the invention for the exploitation of a very wide panel.
  • the underground gas generator is fired all along gallery 22.
  • the gasifying agents are injected simultaneously by all the boreholes 21, each of them being provided with an injection device for granulated materials or with a series of valves making it possible to ensure controlled retraction of the injection point.
  • the gasification causes the gradual widening of the gallery 22 and the displacement of the gasification front, counter-current to the direction of flow of the gasifying agents.
  • the pressure wave of the rocks which moves in front of the gasification front, causes the progressive crushing of the coal pillars which separate the holes 21, which leads to a progressive widening of the coal zones, through which s' performs the filtration of gasifying agents.
  • Curves 24 and 25 show two successive positions of the gasification front and the corresponding injection points.

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  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Manufacturing Of Micro-Capsules (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Furnace Charging Or Discharging (AREA)

Claims (4)

1. Verfahren zur kontrollierten Rückziehung des Einführungspunktes von Vergasungsmitteln, die von einer oder mehreren in eine Kohlelagerstätte (1) eingebrachten und mit perforierten Röhren ausgekleideten Bohrungen (2) aus verteilt werden, wobei die Verschiebung des Einführungspunktes der Vergasungsmittel durch fortschreitendes Verschließen des Endes (5) der Röhren erfolgt, dadurch gekennzeichnet, daß das Verschließen durch fortschreitendes Auffüllen des Endes der Röhre erfolgt, ohne daß dadurch das Auffüllmittel in die äußeren Hohlräume hineinfließt, wobei zum Auffüllen ein inertes, granulatförmiges Material unter Zugabe von 20 bis 30 % eines bei Wärme aushärtenden Bindemittels pneumatisch injiziert wird, wie beispielsweise Sand, Korund oder Glasmehl, und wobei der Rhythmus dieser Injektionen dadurch geregelt wird, daß jederzeit zwischen dem Innern der Injektionsbohrungen (2) und der Vergasungszone eine Druckdifferenz aufrechterhalten wird, die hinreichend groß ist, damit die Vergasungsmittel auf eine Länge von einigen Metern in die Kohle eindringen können.
2. Verfahren nach Anspruch 1, wobei die Injektion des granulatförmigen Materials durch einen zellenförmigen Verteiler (7) reguliert wird, dadurch gekennzeichnet, daß die Bewegung des Verteilers (7) durch eine automatische Einrichtung gesteuert wird, die eine konstante Druckdifferenz zwischen dem Ende der Injektionsbohrung und dem Ende der Gewinnungsbohrung für das erzeugte Gas aufrechterhält.
3. Verfahren nach Anspruch 1, wobei das fortschreitende Verschließen des Endes (5) der Röhren durch Schließen von Ventilen (9) erfolgt, die in regelmäßigen Abständen im Innern der Röhren angeordnet sind, dadurch gekennzeichnet, daß das Schließen der Ventile automatisch durch Einrichtungen erfolgt, die auf eine aus dem Fortschreiten der Front der Vergasung resultierenden Temperaturerhöhung ansprechen.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß die Einrichtung zum Schließen der Ventile (9) jeweils eine metallische Stange (13) aufweist, die im Innern einer Hülse (14) um einige Meter längsverschiebbar ist, wobei das Ende dieser Hülse (14) mittels eines Stopfens (15) verschlossen ist, dessen Inneres durch eine Legierung gebildet ist, deren Schmelzpunkt im Bereich zwischen 200 und 300 °C liegt.
EP86200119A 1985-03-07 1986-01-29 Verfahren zur kontrollierten Rückziehung des Einführungspunktes in die Lagerstätte bei der Untertagevergasung von Kohle Expired EP0197566B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86200119T ATE41471T1 (de) 1985-03-07 1986-01-29 Verfahren zur kontrollierten rueckziehung des einfuehrungspunktes in die lagerstaette bei der untertagevergasung von kohle.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE0/214614A BE901892A (fr) 1985-03-07 1985-03-07 Nouveau procede de retraction controlee du point d'injection des agents gazeifiants dans les chantiers de gazeification souterraine du charbon.
BE214614 1985-03-07

Publications (2)

Publication Number Publication Date
EP0197566A1 EP0197566A1 (de) 1986-10-15
EP0197566B1 true EP0197566B1 (de) 1989-03-15

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EP86200119A Expired EP0197566B1 (de) 1985-03-07 1986-01-29 Verfahren zur kontrollierten Rückziehung des Einführungspunktes in die Lagerstätte bei der Untertagevergasung von Kohle

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US (2) US4705109A (de)
EP (1) EP0197566B1 (de)
AT (1) ATE41471T1 (de)
AU (1) AU585584B2 (de)
BE (1) BE901892A (de)
DE (1) DE3662418D1 (de)

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Also Published As

Publication number Publication date
US4754811A (en) 1988-07-05
AU585584B2 (en) 1989-06-22
BE901892A (fr) 1985-07-01
US4705109A (en) 1987-11-10
ATE41471T1 (de) 1989-04-15
DE3662418D1 (en) 1989-04-20
EP0197566A1 (de) 1986-10-15
AU5425986A (en) 1986-09-11

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