EP0229434B1 - Procédé concernant l'amélioration du conditionnement des agents gazéifiants utilisés dans les procédés de gazéification souterraine du charbon - Google Patents

Procédé concernant l'amélioration du conditionnement des agents gazéifiants utilisés dans les procédés de gazéification souterraine du charbon Download PDF

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Publication number
EP0229434B1
EP0229434B1 EP19860202396 EP86202396A EP0229434B1 EP 0229434 B1 EP0229434 B1 EP 0229434B1 EP 19860202396 EP19860202396 EP 19860202396 EP 86202396 A EP86202396 A EP 86202396A EP 0229434 B1 EP0229434 B1 EP 0229434B1
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EP
European Patent Office
Prior art keywords
gasification
water
injection
foam
coal
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 - Lifetime
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EP19860202396
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German (de)
English (en)
French (fr)
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EP0229434A1 (fr
Inventor
Pierre Ledent
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Individual
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Individual
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Publication of EP0229434A1 publication Critical patent/EP0229434A1/fr
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/14—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using liquids and gases, e.g. foams
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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

Definitions

  • the choice and packaging of the gasifying agent is an important element in the industrial development of underground gasification processes for coal.
  • the oxygen + water vapor mixture was successfully used in the U.S.A. in the first underground gasification trials carried out on a pilot scale, in coal deposits located at shallow depths.
  • the use of water vapor, in mixture with an oxygen-containing gas has many drawbacks for the industrial development of underground gasification of coal in large deposits located at medium or great depth.
  • gasifying agent preheated to a temperature of the order of 200 ° C to 250 ° C also has the effect of causing the auto-ignition of the coal as soon as the gasifying agent comes into contact with it. , which excludes any possibility of developing an underground gasification process in which the gasification front would move against the flow direction of the gasifying agent.
  • Patent AU-A-64329/80 proposes to use, as gasifying agent, air or oxygen at ambient temperature and to inject liquid water, continuously or intermittently, into the wells of injection of the gasifying agent to minimize the auto-ignition reactions of the carbon and control the position of the gasification zone.
  • the process which is the subject of the present invention uses the same technique for the conditioning of the gasifying agents used in the underground gasification processes of coal and which consist of a gas containing oxygen, with water at 1 liquid state and a low dose of foaming agent.
  • the production of foam is carried out at the bottom of the injection wells equipped with two concentric casings, the external casing, used for injecting the oxidizing gas, being completed. by one or more mesh filter screens of approximately one to two millimeters in diameter, and the inner tubing, used for injecting the mixture of water and foaming agent, being terminated by one or more sprayers or by a device perforated sheet ensuring the dispersion of water into fine droplets.
  • the foaming agent can be a proteinaceous substance, of the type which are used in the fight against fires and which are constituted by hydrolysed proteins obtained from natural substances such as: horns, hoofs of cattle, feathers, fish hair, scales ... It can also be a synthetic chemical, such as triethanolamine laurysulfate, sodium laury ether sulfate or any other surfactant, foam stabilizer, which helps maintain the homogeneity of the two-phase mixture for the duration of the underground journey of the gasifying agent and, in particular, one of the surfactant products cited in patent FR-A 1 192 395 and which are used by the petroleum industry for carrying out drilling at the foam.
  • a synthetic chemical such as triethanolamine laurysulfate, sodium laury ether sulfate or any other surfactant, foam stabilizer, which helps maintain the homogeneity of the two-phase mixture for the duration of the underground journey of the gasifying agent and, in particular, one of the surfactant products cited
  • each injection well is equipped with two concentric tubes: the external casing 1, used for the injection of the oxidizing gas, ends at a short distance from the vein to be gasified by one or more filter screens 2 with meshes of one to two millimeters in diameter.
  • a gasifying agent in the form of foam prepared from water added with a foaming agent and from a gas containing oxygen can be adapted to all underground coal gasification processes. .
  • FIG. 2 shows, in a section passing through a vertical plane, an underground gasification process by filtration without prior connection, at the level of the vein, in which the well 12 is used for the injection of a gasifying agent, under high pressure , and the well 13 for the recovery of the gas produced.
  • the gasification begins by igniting the coal at the bottom of the well 13 and it progresses against the flow direction of the gasifying agent.
  • the preconditioning of the gasifying agent in the form of foam ensures a uniform distribution of the water and the oxidizing gas, in the layer of carbon, and maintains on the surface of the carbon a film of water which inhibits the oxidation reactions. , which makes it possible to use a gasifying agent with a high oxygen content, without causing the auto-ignition of the coal in the vicinity of the injection well.
  • Figure 3 shows, in a section passing through a vertical plane, a gasification process in which the gasifying agent with high oxygen content is injected into a very long borehole 14, drilled in the thickness of the vein and coated with steel casing, the gas produced being evacuated by the well 15.
  • the gasification begins with the ignition of the coal, at a point located a short distance from the well 15.
  • the gasification operation involves alternating periods during which the point of injection of the gasifying agent remains fixed and periods during which the point of injection is retracted, by controlled combustion of the casing.
  • the preconditioning of the gasifying agent in the form of foam prevents back-combustion of the casing.
  • the retraction operations of the injection point of the gasifying agent are controlled by temporary interruptions of the water supply to the foam generator, going hand in hand with an adjustment of the gas flow rate to a value which allows the backburning of the casing. .
  • Figure 4 shows a section passing through the thickness of the layer an underground gasification process in which the gasification operation takes place between an injection borehole 16 and a recovery borehole 17, along a channel 18 , open in the thickness of the layer, and which is limited on one side by the coal being gasified and on the other side by rock scree from the caving of the roof, in the zone 19 already gasified.
  • the gasifying agent injected in the form of foam ensures the filling of the cracks and cavities which remain between the rocky scree of the blasted zone, which has the effect of channeling the flow of gases along the coal gasification front, in the area where the rise in temperature evaporates the bubbles that make up the foam.
EP19860202396 1986-01-16 1986-12-30 Procédé concernant l'amélioration du conditionnement des agents gazéifiants utilisés dans les procédés de gazéification souterraine du charbon Expired - Lifetime EP0229434B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE6048181 1986-01-16
BE6/48181A BE904055A (fr) 1986-01-16 1986-01-16 Procede concernant l'amelioration du conditionnement des agents gazeifiants utilises dans les procedes de gazeification souterraine du charbon.

Publications (2)

Publication Number Publication Date
EP0229434A1 EP0229434A1 (fr) 1987-07-22
EP0229434B1 true EP0229434B1 (fr) 1990-04-18

Family

ID=3874980

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860202396 Expired - Lifetime EP0229434B1 (fr) 1986-01-16 1986-12-30 Procédé concernant l'amélioration du conditionnement des agents gazéifiants utilisés dans les procédés de gazéification souterraine du charbon

Country Status (3)

Country Link
EP (1) EP0229434B1 (un)
BE (1) BE904055A (un)
DE (1) DE3670526D1 (un)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE906016A (fr) * 1986-12-22 1987-04-16 Ledent Pierre Nouveau procede de production de methane par gazeification souterraine du charbon.
BE1012151A3 (fr) * 1995-02-14 2000-06-06 Ledent Pierre Procede d'exploitation d'un gisement de charbon par gazeification souterraine du charbon.
US6725933B2 (en) 2001-09-28 2004-04-27 Halliburton Energy Services, Inc. Method and apparatus for acidizing a subterranean well formation for improving hydrocarbon production
US6719054B2 (en) 2001-09-28 2004-04-13 Halliburton Energy Services, Inc. Method for acid stimulating a subterranean well formation for improving hydrocarbon production
US6662874B2 (en) * 2001-09-28 2003-12-16 Halliburton Energy Services, Inc. System and method for fracturing a subterranean well formation for improving hydrocarbon production
GB0418295D0 (en) * 2004-08-17 2004-09-15 Dew Pitchmastic Plc Bioremediation foam and delivery method
CA2652144C (en) * 2006-05-17 2016-07-12 Green Earth Industries, Llc Increased microbial production of methane gas from subsurface hydrocarbon containing formations
WO2010026553A1 (en) * 2008-09-04 2010-03-11 Schlumberger Canada Limited Reversible peptide surfactants for oilfield applications
GB2518626A (en) 2013-09-25 2015-04-01 Venture Engineering Services Ltd Well apparatus and method for use in gas production
CN107401393B (zh) * 2017-07-31 2023-07-25 山西晋城无烟煤矿业集团有限责任公司 排水采气一体化采空区瓦斯抽采井井身结构及其施工方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1192395A (fr) 1957-01-09 1959-10-26 Jersey Prod Res Co Procédé de forage à la mousse
US3448807A (en) 1967-12-08 1969-06-10 Shell Oil Co Process for the thermal recovery of hydrocarbons from an underground formation
US3464491A (en) * 1967-12-18 1969-09-02 Pan American Petroleum Corp Oil recovery from formations containing channels
US3905553A (en) 1973-08-03 1975-09-16 Sun Oil Co Delaware Mist injection method and system
US4072191A (en) 1975-06-12 1978-02-07 Phillips Petroleum Company Fire floor process
US4121664A (en) * 1977-10-17 1978-10-24 Union Oil Company Of California Biodegradable foaming agent in drilling and workover operations
US4334579A (en) * 1980-08-29 1982-06-15 The United States Of America As Represented By The United States Department Of Energy Method for gasification of deep, thin coal seams
US4391327A (en) * 1981-05-11 1983-07-05 Conoco Inc. Solvent foam stimulation of coal degasification well
GB2099884B (en) * 1981-06-05 1985-04-03 Drill Aid Methods & Materials A method of boring holes
US4442018A (en) * 1982-11-01 1984-04-10 The United States Of America As Represented By The United States Department Of Energy Stabilized aqueous foam systems and concentrate and method for making them

Also Published As

Publication number Publication date
BE904055A (fr) 1986-05-15
DE3670526D1 (de) 1990-05-23
EP0229434A1 (fr) 1987-07-22

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