EP0131499A1 - Method for the oxidation of hydrocarbonaceous subterranean sedimentary formations - Google Patents

Method for the oxidation of hydrocarbonaceous subterranean sedimentary formations Download PDF

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Publication number
EP0131499A1
EP0131499A1 EP84401286A EP84401286A EP0131499A1 EP 0131499 A1 EP0131499 A1 EP 0131499A1 EP 84401286 A EP84401286 A EP 84401286A EP 84401286 A EP84401286 A EP 84401286A EP 0131499 A1 EP0131499 A1 EP 0131499A1
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Prior art keywords
tube
injected
annular space
central tube
gas
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EP84401286A
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German (de)
French (fr)
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EP0131499B1 (en
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Gérard Lefranc
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Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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    • 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
    • E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
    • E21B36/001—Cooling arrangements
    • 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

Definitions

  • the present invention relates to the oxidation of underground sedimentary layers containing hydrocarbon materials.
  • the method of oxidizing underground sedimentary layers containing hydrocarbon materials consists in injecting a gas containing oxygen in at least one injection well starting from the surface and opening into said underground layer so as to cause the partial or total oxidation of said hydrocarbon materials and the flow of said hydrocarbon materials in the state of fluids to at least one production well located at a distance from said injection well and also opening into said underground layer, said injection well consisting of a first central tube into which an oxygen-containing gas is injected, a second concentric tube to the first defining a first annular space into which reaction water is injected, and a concentric casing said second tube defining a second annular space and extending deeper into the underground layer than said first and second tubes, said first and second tubes opening into the lower part of said casing after passing through an annular seal called "packer", placed between the second tube and the casing.
  • a gas containing oxygen in at least one injection well starting from the surface and opening into said underground layer so as to cause the partial or total oxidation of said hydrocarbon materials and the flow
  • a circulation of cold water is established in the second annular space.
  • the central tube 4 is a coiled tube unwound from a coil 12 fixed on the surface on a appropriate device (not shown in the figure); the tube 4 can also be constituted by tubular elements screwed to each other. However, it is preferred to use an unwound coiled tube which has the advantage of being able to be installed and removed quickly.
  • This tube 4 is preferably made of stainless or refractory metal.
  • an inert or slightly oxidizing gas is injected into the tube 4 so as to purge the bottom of the well, which makes it possible, during the next step, to start the oxidation in an area where the risks of 'explosion are minimal.
  • the rate of injection of the oxidizing gas into the tube 4 can range from 1000 to 10,000 m 3 / h and that the rate of injection of the reaction water into space annular 7 can be 10 liters per m 3 of oxidizing gas injected into the tube 4.

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  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Processing Of Solid Wastes (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Fire-Extinguishing Compositions (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

1. A method for the oxidation of sedimentary subterranean formations (3), containing hydrocarbonaceous materials by injecting in a first step a gas inert or little oxidizing and in a second step a gas containing oxygen into at least one injection shaft (1) coming from the surface (2) and opening in said subterranean formation (3) to provoke the partial or total oxidation of said hydrocarbonaceous materials and the effluence thereof in the fluid state to at least one production shaft arranged in a distance from said injection shaft (1) and opening also in said subterranean formation, said injection shaft (1) consisting of a first central tube (4), a second tube (5) concentric with the first one and defining a first annular space (7) and a shaft tube (6) concentric with said second tube (5) and defining a second annular space (8) and extending deeper into the subterranean formation (3) than said first and second tubes, characterized in that the first and second tubes (4 and 5) open in the lower part of said shaft tube (6) after having crossed an annular sealing joint (9) arranged between the second tube (5) and the shaft tube (6), a circulation of cold water being established in the second annular space (8) during the step of injection of oxygen, that during the first step one injects the gas inert or little oxidizing in the first central tube (4), that during the second step one injects into said central tube (4) an oxidizing gas and increases progressively the concentration of oxygen of said oxidizing gas and injects into the first annular space (7) reaction water, the injected reaction fluids penetrating into the subterranean formation (3) through perforations (10) regularly distributed and arranged in the side wall of the lower part of the shaft tube (6), and that during the second step one controls the pressure where the reaction takes place within said sedimentary subterranean formations (3) to detect a danger of explosion, the injection of the reaction fluids being stopped immediately, when a variation of pressure corresponding to such a danger of explosion has been found, and in the annular space (7) a security fluid selected from the group hydrogen, carbon dioxide and flooding water is injected, the sequence of injection of fluids according to the two above steps being presumed after having controlled the incident.

Description

La présente invention concerne l'oxydation de couches sédimentaires souterraines contenant des matières hydrocarbonées.The present invention relates to the oxidation of underground sedimentary layers containing hydrocarbon materials.

Il existe différentes méthodes pour oxyder les couches sédimentaires souterraines contenant des matières hydrocarbonées parmi lesquelles les méthodes dites "thermiques" qui consistent à oxyder les couches souterraines à l'aide d'un gaz oxydant, d'air, d'air enrichi en oxygène ou d'oxygène pur. Selon ces méthodes, l'oxydation des couches hydrocarbonées est :

  • - soit partielle (gazéification du charbon) faisant intervenir des réactions du type :
    Figure imgb0001
    Figure imgb0002
    Figure imgb0003
  • - soit totale (récupération assistée du pétrole par combustion in situ).
There are different methods for oxidizing the underground sedimentary layers containing hydrocarbon materials, among which the so-called "thermal" methods which consist in oxidizing the underground layers using an oxidizing gas, air, oxygen-enriched air or pure oxygen. According to these methods, the oxidation of the hydrocarbon layers is:
  • - either partial (gasification of coal) involving reactions of the type:
    Figure imgb0001
    Figure imgb0002
    Figure imgb0003
  • - or total (enhanced oil recovery by in situ combustion).

La plupart des installations de mise en oeuvre des méthodes utilisées actuellement comportent un puits d'injection débouchant dans la couche souterraine hydrocarbonée et au moins un puits de production situé à une certaine distance du puits d'injection. Le puits d'injection comprend un tube central dit "tubing" dans lequel on injecte le gaz contenant de l'oxygène et un tube concentrique audit tubing dans lequel on injecte, par exemple, de l'eau dite eau de réaction. Ceci entraîne soit une modification de la viscosité des matières hydrocarbonées contenues dans la couche souterraine (cas du pétrole), soit leur oxydation partielle (cas du charbon), ce qui, dans les deux cas, favorise l'écoulement desdites matières hydrocarbonées vers le ou les puits de production.Most of the installations for implementing the methods currently used comprise an injection well opening into the underground hydrocarbon layer and at least one production well located at a certain distance from the injection well. The injection well comprises a central tube called "tubing" into which the oxygen-containing gas is injected and a tube concentric with said tubing into which is injected, for example, water called reaction water. This causes either a modification of the viscosity of the hydrocarbon materials contained in the underground layer (case of petroleum), or their partial oxidation (case of coal), which, in both cases, promotes the flow of said hydrocarbon materials towards or production wells.

L'un des problèmes essentiels rencontrés dans ces méthodes d'oxydation des couches souterraines de matières hydrocarbonées provient du fait que les pressions d'injection du gaz oxydant et de l'eau dans le puits d'injection sont le plus souvent très élevées du fait, soit de la valeur de la pression hydrostatique de fond, soit de la volonté de travailler à haute pression. Ainsi, les pressions d'injection des produits peuvent atteindre des valeurs telles que les cinétiques d'oxydation sont accélérées au point de pouvoir rendre les réactions explosives. C'est pourquoi, dans un but de sécurité, on cherche à limiter le plus possible ces risques d'explosion lors de la mise en oeuvre de ces procédés.One of the essential problems encountered in these methods of oxidizing underground layers of hydrocarbon materials stems from the fact that the injection pressures of the oxidizing gas and of the water in the injection well are most often very high because , either the value of the bottom hydrostatic pressure, or the desire to work at high pressure. Thus, the injection pressures of the products can reach values such that the oxidation kinetics are accelerated to the point of being able to make the reactions explosive. This is why, with a view to safety, it is sought to limit these risks of explosion as much as possible during the implementation of these methods.

Parmi les procédés d'oxydation de couches souterraines selon lesquels on cherche à limiter les risques d'explosion, on peut citer le procédé décrit dans le brevet européen n° 82.400.150.7 selon lequel le tube central d'injection du gaz oxydant comporte à son extrémité inférieure un ajutage dont les dimensions sont calculées de façon à ce que la vitesse d'arrivée dudit gaz oxydant soit telle que, s'il se produit une explosion au fond du puits d'injection, il n'y ait pas retour de flamme. On peut également citer le procédé décrit dans la demande de brevet européen n° 82.401.680.2 qui consiste à injecter de l'oxygène dans un conduit séparé et éloigné d'une certaine distance du conduit d'injection d'air ou d'eau.Among the methods of oxidizing underground layers according to which it is sought to limit the risks of explosion, there may be mentioned the method described in European Patent No. 82,400,150.7 according to which the central tube for injecting the oxidizing gas comprises at its lower end a nozzle whose dimensions are calculated so that the speed of arrival of said oxidizing gas is such that, if an explosion occurs at the bottom of the injection well, there is no flashback . Mention may also be made of the process described in European patent application No. 82,401,680.2 which consists in injecting oxygen into a separate pipe and distant from a certain distance from the air or water injection pipe.

L'invention a pour objet un procédé d'oxydation de couches souterraines hydrocarbonées qui permet également de résoudre ce problème de sécurité et présente l'avantage d'être d'une mise en oeuvre simple.The subject of the invention is a process for the oxidation of underground hydrocarbon layers which also makes it possible to solve this safety problem and has the advantage of being simple to implement.

Le procédé d'oxydation de couches sédimentaires souterraines contenant des matières hydrocarbonées conforme à l'invention consiste à injecter un gaz contenant de l'oxygène dans au moins un puits d'injection partant de la surface et débouchant dans ladite couche souterraine de façon à provoquer l'oxydation partielle ou totale desdites matières hydrocarbonées et l'écoulement desdites matières hydrocarbonées à l'état de fluides vers au moins un puits de production situé à distance dudit puits d'injection et débouchant également dans ladite couche souterraine, ledit puits d'injection étant constitué d'un premier tube central dans lequel on injecte un gaz contenant de l'oxygène, d'un deuxième tube concentrique au premier définissant un premier espace annulaire dans lequel on injecte de l'eau de réaction, et d'un cuvelage concentrique audit deuxième tube définissant un deuxième espace annulaire et s'étendant plus en profondeur dans la couche souterraine que lesdits premier et deuxième tubes, lesdits premier et deuxième tubes débouchant dans la partie inférieure dudit cuvelage après avoir traversé un joint annulaire d'étanchéité dit "packer", placé entre le deuxième tube et le cuvelage. Ce procédé se caractérise en ce que, dans une première étape, on injecte dans le tube central un gaz de purge contenant pas ou peu d'oxygène, puis, dans une deuxième étape, on injecte dans ledit tube central un gaz oxydant et on augmente progressivement la concentration en oxygène dudit gaz oxydant, et, au cours de ladite deuxième étape, on contrôle la réaction en remplaçant, si nécessaire, l'eau injectée dans le premier espace annulaire par un fluide de sécurité, les fluides de réaction injectés pénétrant dans la couche souterraine par des perforations régulièrement réparties, ménagées dans la paroi latérale de la partie inférieure du cuvelage.The method of oxidizing underground sedimentary layers containing hydrocarbon materials according to the invention consists in injecting a gas containing oxygen in at least one injection well starting from the surface and opening into said underground layer so as to cause the partial or total oxidation of said hydrocarbon materials and the flow of said hydrocarbon materials in the state of fluids to at least one production well located at a distance from said injection well and also opening into said underground layer, said injection well consisting of a first central tube into which an oxygen-containing gas is injected, a second concentric tube to the first defining a first annular space into which reaction water is injected, and a concentric casing said second tube defining a second annular space and extending deeper into the underground layer than said first and second tubes, said first and second tubes opening into the lower part of said casing after passing through an annular seal called "packer", placed between the second tube and the casing. This process is characterized in that, in a first step, a purge gas containing little or no oxygen is injected into the central tube, then, in a second step, it is injected into said central tube an oxidizing gas and the oxygen concentration of said oxidizing gas is gradually increased, and, during said second step, the reaction is controlled by replacing, if necessary, the water injected into the first annular space with a safety, the injected reaction fluids entering the underground layer through regularly distributed perforations, formed in the side wall of the lower part of the casing.

Selon l'invention, le fluide de sécurité est constitué, par exemple, par de l'azote, de l'anhydride carbonique, ou de l'eau dite "eau de noyage", c'est-à-dire de l'eau injectée en très grande quantité.According to the invention, the safety fluid consists, for example, of nitrogen, carbon dioxide, or water called "flooding water", that is to say water injected in very large quantities.

Selon une caractéristique de l'invention, au cours de la deuxième étape, dans un premier stade, on augmente la concentration en oxygène du gaz injecté dans le tube central dans une proportion d'environ 1 % à environ 30 % d'oxygène, et dans un deuxième stade, on augmente la concentration en oxygène dudit gaz jusqu'à une proportion maximum comprise entre 75 % et 99,5 %.According to a characteristic of the invention, during the second stage, in a first stage, the oxygen concentration of the gas injected into the central tube is increased in a proportion of approximately 1% to approximately 30% of oxygen, and in a second stage, the oxygen concentration of said gas is increased to a maximum proportion of between 75% and 99.5%.

Selon une autre caractéristique du procédé de l'invention, on établit une circulation d'eau froide dans le deuxième espace annulaire.According to another characteristic of the process of the invention, a circulation of cold water is established in the second annular space.

Les avantages et caractéristiques de l'invention seront mieux compris à la lecture de la description qui suit en référence à la figure jointe qui représente un mode de réalisation d'un puits d'injection permettant la mise en oeuvre du procédé objet de l'invention.The advantages and characteristics of the invention will be better understood on reading the description which follows with reference to the attached figure which represents an embodiment of an injection well allowing the implementation of the process which is the subject of the invention .

Un puits d'injection 1 part de la surface libre 2 du terrain concerné et débouche dans la couche souterraine 3 contenant des matières hydrocarbonées. Le puits 1 comprend un tube central 4, un deuxième tube 5 concentrique au tube 4 et un cuvelage 6 concentrique au tube 5. Le tube 5 définit avec le tube 4 un premier espace annulaire 7, et le cuvelage 6 définit avec le tube 5 un deuxième espace annulaire 8. Le cuvelage 6 s'étend plus en profondeur dans la couche souterraine 3 que les tubes 4 et 5. Les tubes 4 et 5 débouchent dans l'extrémité inférieure du cuvelage 6 après avoir traversé un joint annulaire d'étanchéité 9 dit "packer". La paroi latérale de la partie inférieure du cuvelage 6 qui est dans la couche souterraine 3 est munie de perforations 10 régulièrement réparties. Des moyens d'injection, de régulation et de maintenance, dits "arbre de Noël", placés à la surface 2 sont symbolisés en 11. Le tube central 4 est un tube bobiné déroulé à partir d'une bobine 12 fixée en surface sur un dispositif approprié (non représenté sur la figure) ; le tube 4 peut également être constitué par des éléments tubulaires vissés les uns au autres. Toutefois, on préfère utiliser un tube bobiné déroulé qui présente l'avantage de pouvoir être -installé et retiré rapidement. Ce tube 4 est, de préférence, en métal inoxydable ou réfractaire.An injection well 1 starts from the free surface 2 of the land in question and opens into the underground layer 3 containing hydrocarbon materials. The well 1 comprises a central tube 4, a second tube 5 concentric with the tube 4 and a casing 6 concentric with the tube 5. The tube 5 defines with the tube 4 a first annular space 7, and the casing 6 defines with the tube 5 a second annular space 8. The casing 6 extends deeper into the underground layer 3 than the tubes 4 and 5. The tubes 4 and 5 open into the lower end of the casing 6 after passing through an annular seal 9 says "packer". The side wall of the lower part of the casing 6 which is in the underground layer 3 is provided with perforations 10 regularly distributed. Means of injection, regulation and maintenance, called "Christmas tree", placed on the surface 2 are symbolized at 11. The central tube 4 is a coiled tube unwound from a coil 12 fixed on the surface on a appropriate device (not shown in the figure); the tube 4 can also be constituted by tubular elements screwed to each other. However, it is preferred to use an unwound coiled tube which has the advantage of being able to be installed and removed quickly. This tube 4 is preferably made of stainless or refractory metal.

La mise en oeuvre du procédé de l'invention est la suivante.The implementation of the method of the invention is as follows.

On injecte tout d'abord, dans le tube 4, un gaz inerte ou peu oxydant de façon à purger le fond du puits, ce qui permet, lors de l'étape suivante, de démarrer l'oxydation dans une zone où les risques d'explosion sont minimes.First of all, an inert or slightly oxidizing gas is injected into the tube 4 so as to purge the bottom of the well, which makes it possible, during the next step, to start the oxidation in an area where the risks of 'explosion are minimal.

Une fois cette première étape de purge terminée, on injecte dans le tube 4 un gaz contenant de l'oxygène et on augmente progressivement la concentration en oxygène dudit gaz jusqu'à une proportion maximum comprise entre 75 % et 99,5 X. Simultanément, on injecte de l'eau de réaction dans l'espace annulaire 7 ; par "eau de réaction", on entend de l'eau sous forme, soit de liquide, soit de vapeur, soit de mousse. De plus, on établit une circulation d'eau froide dans l'espace annulaire 8 de façon à éviter un échauffement trop important du "packer" 9 (en effet, le packer, qui est constitué d'éléments hydrocarbonés, type caoutchouc, ne supporte pas des températures trop élevées). Cette circulation d'eau de refroidissement peut de façon avantageuse être mise en place dans l'espace annulaire 8 grâce à un dispositif classique (non représenté sur la figure) du type "Coiled Tubing" (tube bobiné déroulé) ou "Snubbing" (éléments tubulaires vissés).Once this first purging step has been completed, an oxygen-containing gas is injected into the tube 4 and the oxygen concentration of said gas is gradually increased to a maximum proportion of between 75% and 99.5 X. Simultaneously, reaction water is injected into the annular space 7; "Reaction water" means water in the form of either liquid, vapor or foam. In addition, a cold water circulation is established in the annular space 8 so as to avoid excessive heating of the "packer" 9 (indeed, the packer, which is made up of hydrocarbon elements, rubber type, does not support not too high temperatures). This circulation of cooling water can advantageously be placed in the annular space 8 using a conventional device (not shown in the figure) of the "Coiled Tubing" or "Snubbing" type (elements tubular).

Grâce à un système de détection approprié (non représenté sur la figure) placé en surface, si l'on décèle une variation de pression correspondant à un danger d'explosion, on arrête immédiatement l'injection des fluides de réaction et on injecte à la place, dans l'espace annulaire 7, un fluide de sécurité tel que de l'azote, de l'anhydride carbonique ou de l'eau de noyage. Après contrôle de l'incident, on reprend la séquence d'injection à zéro.Thanks to an appropriate detection system (not shown in the figure) placed on the surface, if a pressure variation corresponding to a danger of explosion is detected, the injection of reaction fluids is immediately stopped and injected at the places, in the annular space 7, a safety fluid such as nitrogen, carbon dioxide or flooding water. After checking the incident, the injection sequence is resumed at zero.

A titre d'exemple, la première étape de purge dure environ quelques jours, le premier stade de la deuxième étape d'oxydation (concentration en oxygène du gaz injecté dans le tube 4 augmentant d'environ 1 % à environ 30 %) est d'environ 15 jours et la durée du deuxième stade de cette deuxième étape (augmentation de la concentration en oxygène du gaz injecté dans le tube 4 pouvant aller jusqu'à environ 99,5 %) est d'environ 350 jours à 700 jours. En cas d'incident, l'injection d'un fluide de sécurité dans l'espace annulaire 7 est d'environ 1 heure.For example, the first purging step lasts about a few days, the first stage of the second oxidation step (oxygen concentration of the gas injected into the tube 4 increasing from about 1% to about 30%) is d about 15 days and the duration of the second stage of this second stage (increase in the oxygen concentration of the gas injected into the tube 4 which can be up to approximately 99.5%) is approximately 350 days to 700 days. In the event of an incident, the injection of a safety fluid into the annular space 7 is approximately 1 hour.

Toujours, à titre d'exemple, on signale que le débit d'injection du gaz oxydant dans le tube 4 peut aller de 1000 à 10000 m3/h et que le débit d'injection de l'eau de réaction dans l'espace annulaire 7 peut être de 10 litres par m3 de gaz oxydant injecté dans le tube 4.Still, by way of example, it is pointed out that the rate of injection of the oxidizing gas into the tube 4 can range from 1000 to 10,000 m 3 / h and that the rate of injection of the reaction water into space annular 7 can be 10 liters per m 3 of oxidizing gas injected into the tube 4.

Ainsi, le procédé conforme à l'invention permet d'éviter tout risque d'explosion lors de de l'oxydation de couches souterraines contenant des matières hydrocabonées, d'une part grâce à la première étape de purge, d'autre part grâce à la possibilité de contrôle des réaction par injection d'un fluide de sécurité en cas d'incident.Thus, the process according to the invention makes it possible to avoid any risk of explosion during the oxidation of underground layers containing hydrocarbon materials, on the one hand thanks to the first purging step, on the other hand thanks to the possibility of controlling reactions by injecting a safety fluid in the event of an incident.

Claims (11)

1. - Procédé d'oxydation de couches sédimentaires souterraines contenant des matières hydrocarbonées selon lequel on injecte un gaz contenant de l'oxygène dans au moins un puits d'injection partant de la surface et débouchant dans ladite couche souterraine de façon à provoquer l'oxydation partielle ou totale desdites matières hydrocarbonées et l'écoulement desdites matières hydrocarbonées à l'état de fluides vers au moins un puits de production situé à distance dudit puits d'injection et débouchant également dans ladite couche souterraine, ledit puits d'injection étant constitué d'un premier tube central dans lequel on injecte un gaz contenant de l'oxygène, d'un deuxième tube concentrique au premier définissant un premier espace annulaire dans lequel on injecte de l'eau dite eau de réaction, et d'un cuvelage concentrique audit deuxième tube définissant un deuxième espace annulaire et s'étendant plus en profondeur dans la couche souterraine que lesdits premier et deuxième tubes, lesdits premier et deuxième tubes débouchant dans la partie inférieure dudit cuvelage après avoir traversé un joint annulaire d'étanchéité dit "packer", placé entre le deuxième tube et le cuvelage, caractérisé en ce que, dans une première étape, on injecte dans le tube central un gaz de purge contenant pas ou peu d'oxygène, puis, dans une deuxième étape, on injecte dans ledit tube central un gaz oxydant et on augmente progressivement la concentration en oxygène dudit gaz oxydant, et, au cours de ladite deuxième étape, on contrôle la réaction en remplaçant, si nécessaire, l'eau injectée dans le premier espace annulaire par un fluide de sécurité, les fluides de réaction injectés pénétrant dans la couche souterraine par des perforations régulièrement réparties, ménagées dans la paroi latérale de la partie inférieure du cuvelage.1. - Process for the oxidation of underground sedimentary layers containing hydrocarbonaceous materials according to which a gas containing oxygen is injected into at least one injection well starting from the surface and opening into said underground layer so as to cause the partial or total oxidation of said hydrocarbon materials and the flow of said hydrocarbon materials in the state of fluids to at least one production well located at a distance from said injection well and also opening into said underground layer, said injection well being constituted a first central tube into which an oxygen-containing gas is injected, a second concentric tube to the first defining a first annular space into which water called reaction water is injected, and a concentric casing said second tube defining a second annular space and extending deeper into the underground layer than said first and second tubes, said first and second tubes opening into the lower part of said casing after having passed through an annular seal called "packer", placed between the second tube and the casing, characterized in that, in a first step, the central tube is injected a purge gas containing little or no oxygen, then, in a second step, an oxidizing gas is injected into said central tube and the oxygen concentration of said oxidizing gas is gradually increased, and, during said second step, controls the reaction by replacing, if necessary, the water injected into the first annular space by a safety fluid, the injected reaction fluids penetrating into the underground layer by regularly distributed perforations, formed in the side wall of the lower part of the casing. 2. - Procédé selon la revendication 1, caractérisé en ce que le fluide de sécurité est constitué par de l'azote, de l'anhydride carbonique, de l'eau dite eau de noyage.2. - Method according to claim 1, characterized in that the safety fluid consists of nitrogen, carbon dioxide, water known as flooding water. 3. - Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que, au cours de la deuxième étape, dans un premier stade, on augmente la concentration en oxygène du gaz injecté dans le tube central dans une proportion d'environ 1 % à environ 30 %, et dans un deuxième stade, on augmente la concentration en oxygène dudit gaz jusqu'à une proportion maximum comprise entre 75 % et 99,5 %.3. - Method according to one of claims 1 or 2, characterized in that, during the second stage, in a first stage, the oxygen concentration of the gas injected into the central tube is increased in a proportion of approximately 1% to about 30%, and in a second stage, the oxygen concentration of said gas is increased to a maximum proportion of between 75% and 99.5%. 4. - Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'on établit une circulation d'eau froide dans le deuxième espace annulaire.4. - Method according to one of claims 1 to 3, characterized in that a circulation of cold water is established in the second annular space. 5. - Procédé selon l'une des revendications 1 à 4, caractérisé en ce qu'on injecte le gaz de purge, puis le gaz oxydant dans le tube central, ledit tube central étant amovible.5. - Method according to one of claims 1 to 4, characterized in that the purge gas is injected, then the oxidizing gas into the central tube, said central tube being removable. 6. - Procédé selon la revendication 5, caractérisé en ce que ledit tube central est constitué par un tube bobiné déroulé.6. - Method according to claim 5, characterized in that said central tube is constituted by an unwound coiled tube. 7. - Procédé selon la revendication 5, caractérisé en ce que ledit tube central est formé d'éléments tubulaires vissés les uns aux autres.7. - Method according to claim 5, characterized in that said central tube is formed of tubular elements screwed to each other. 8. - Procédé selon l'une des revendications 1 à 7, caractérisé en ce que la durée de la première étape est de quelques jours, la durée du premier stade de la deuxième étape est d'environ 15 jours et la durée du deuxième stade de ladite deuxième étape est d'environ 350 jours à 700 jours.8. - Method according to one of claims 1 to 7, characterized in that the duration of the first stage is a few days, the duration of the first stage of the second stage is approximately 15 days and the duration of the second stage of said second stage is from about 350 days to 700 days. 9. - Procédé selon la revendication 8, caractérisé en ce que la durée d'injection d'un fluide de sécurité dans le premier espace annulaire est d'environ une heure.9. - Method according to claim 8, characterized in that the duration of injection of a safety fluid into the first annular space is approximately one hour. 10. - Procédé selon l'une des revendications 1 à 9, caractérisé en ce qu'on injecte le gaz oxydant dans le tube central à un débit de 1000 à 10000 m3/heure.10. - Method according to one of claims 1 to 9, characterized in that the oxidizing gas is injected into the central tube at a rate of 1000 to 10000 m 3 / hour. 11. - Procédé selon l'une des revendications 1 à 10, caractérisé en ce qu'on injecte l'eau dans le premier espace annulaire à un débit de 10 litresim3 de gaz oxydant injecté dans le tube central.11. - Method according to one of claims 1 to 10, characterized in that water is injected into the first annular space at a rate of 10 litersim 3 of oxidizing gas injected into the central tube.
EP84401286A 1983-06-30 1984-06-21 Method for the oxidation of hydrocarbonaceous subterranean sedimentary formations Expired EP0131499B1 (en)

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AT84401286T ATE24226T1 (en) 1983-06-30 1984-06-21 METHODS OF OXIDATION OF UNDERGROUND HYDROCARBON SEDIMENTARY RESERVES.

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FR8310829 1983-06-30
FR8310829A FR2548207B1 (en) 1983-06-30 1983-06-30 PROCESS FOR THE OXIDATION OF UNDERGROUND SEDIMENTARY LAYERS CONTAINING HYDROCARBON MATERIALS

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EP0131499B1 EP0131499B1 (en) 1986-12-10

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Publication number Priority date Publication date Assignee Title
EP0303504A1 (en) * 1987-08-12 1989-02-15 Tohoku University Underground chemical reactor
WO1999063200A1 (en) * 1998-05-29 1999-12-09 Zhaoxi Chai A coal mine through which coal gas can be produced directly from coal seam and a coal gas production method through the mine
ITMI20101095A1 (en) * 2010-06-17 2011-12-18 Antonino Gambino PETROLEUM ARREST DEVICE FROM THE FIELD
CN108386171A (en) * 2018-02-22 2018-08-10 中海石油(中国)有限公司 Water injection intensity optimization method after deep water turbidite sandstone waterflooding reservoir oil well water breakthrough

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115163021B (en) * 2022-07-13 2023-11-03 中国矿业大学 Water injection and nitrogen injection gas extraction hole sealing device and drilling arrangement method

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US3473610A (en) * 1966-08-12 1969-10-21 Deutsche Erdoel Ag Process for obtaining bitumens from underground deposits
US3987852A (en) * 1974-09-30 1976-10-26 Terry Ruel C Method of and apparatus for in situ gasification of coal and the capture of resultant generated heat
DE2623318A1 (en) * 1975-06-02 1976-12-23 Inst Nat Des Ind Extractives I METHOD AND DEVICE FOR SMELTERING SOLID FUELS UNDERGROUND
US4042026A (en) * 1975-02-08 1977-08-16 Deutsche Texaco Aktiengesellschaft Method for initiating an in-situ recovery process by the introduction of oxygen
EP0057641A2 (en) * 1981-01-28 1982-08-11 Canadian Liquid Air Ltd Air Liquide Canada Ltee In situ combustion for oil recovery

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FR1080040A (en) * 1952-05-16 1954-12-06 Union Rheinische Braunkohlen Process for maintaining constant pressure in oil and natural gas fields
US3473610A (en) * 1966-08-12 1969-10-21 Deutsche Erdoel Ag Process for obtaining bitumens from underground deposits
US3987852A (en) * 1974-09-30 1976-10-26 Terry Ruel C Method of and apparatus for in situ gasification of coal and the capture of resultant generated heat
US4042026A (en) * 1975-02-08 1977-08-16 Deutsche Texaco Aktiengesellschaft Method for initiating an in-situ recovery process by the introduction of oxygen
DE2623318A1 (en) * 1975-06-02 1976-12-23 Inst Nat Des Ind Extractives I METHOD AND DEVICE FOR SMELTERING SOLID FUELS UNDERGROUND
EP0057641A2 (en) * 1981-01-28 1982-08-11 Canadian Liquid Air Ltd Air Liquide Canada Ltee In situ combustion for oil recovery

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0303504A1 (en) * 1987-08-12 1989-02-15 Tohoku University Underground chemical reactor
US4937052A (en) * 1987-08-12 1990-06-26 Tohoku University Underground chemical reactor
WO1999063200A1 (en) * 1998-05-29 1999-12-09 Zhaoxi Chai A coal mine through which coal gas can be produced directly from coal seam and a coal gas production method through the mine
ITMI20101095A1 (en) * 2010-06-17 2011-12-18 Antonino Gambino PETROLEUM ARREST DEVICE FROM THE FIELD
CN108386171A (en) * 2018-02-22 2018-08-10 中海石油(中国)有限公司 Water injection intensity optimization method after deep water turbidite sandstone waterflooding reservoir oil well water breakthrough
CN108386171B (en) * 2018-02-22 2020-02-14 中海石油(中国)有限公司 Method for optimizing water injection strength of oil well after water breakthrough in deep water turbid sandstone water injection development

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FR2548207A1 (en) 1985-01-04
EP0131499B1 (en) 1986-12-10
AU556316B2 (en) 1986-10-30
AU2999784A (en) 1985-01-03
DE3461669D1 (en) 1987-01-22
FR2548207B1 (en) 1987-06-05
BR8403250A (en) 1985-06-11
ATE24226T1 (en) 1986-12-15

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