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EP0435727A1 - Method and device for stimulation of an underground formation by injection of a fluid coming from an adjacent zone being connected to the first one by a drain hole transversing a low-permeable intermediate layer - Google Patents

Method and device for stimulation of an underground formation by injection of a fluid coming from an adjacent zone being connected to the first one by a drain hole transversing a low-permeable intermediate layer Download PDF

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Publication number
EP0435727A1
EP0435727A1 EP90403557A EP90403557A EP0435727A1 EP 0435727 A1 EP0435727 A1 EP 0435727A1 EP 90403557 A EP90403557 A EP 90403557A EP 90403557 A EP90403557 A EP 90403557A EP 0435727 A1 EP0435727 A1 EP 0435727A1
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EP
European Patent Office
Prior art keywords
zone
drain
intermediate layer
underground
deviated
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Granted
Application number
EP90403557A
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German (de)
French (fr)
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EP0435727B1 (en
Inventor
Claude Gadelle
Jacques Lessi
Gérard Renard
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IFP Energies Nouvelles IFPEN
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IFP Energies Nouvelles IFPEN
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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
    • 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
    • E21B43/18—Repressuring or vacuum methods

Definitions

  • the present invention relates to a method for stimulating an underground zone by delayed injection of pressurized fluid from a neighboring zone which is connected to the first by means of a deflected drain passing through an intermediate layer which is very slightly permeable.
  • a deflected drain passing through an intermediate layer which is very slightly permeable.
  • the method according to the invention more particularly makes it possible to stimulate the production of an oil zone separated from an underlying zone containing a pressurized fluid, such as an aquiferous zone or possibly an oil zone.
  • Various techniques well known to specialists are used to stimulate the production of oil zones.
  • One of them essentially consists in injecting a pressurized fluid into the production formation, capable of draining the stagnant oil in the rocks because of its viscosity.
  • the fluid used is for example pressurized water injected by drains drilled through the formation. It can also be water existing deep in the production basin itself in the form of an underlying aquifer.
  • the aquifer lies beneath the oil zone and separated from it by a layer which is very slightly permeable due in particular to the presence of heavy and very viscous hydrocarbon products ("tarmat").
  • tarmat heavy and very viscous hydrocarbon products
  • the method according to the invention makes it possible to stimulate the production of an underground zone by delayed injection of a fluid coming from a neighboring zone separated from the first by an intermediate layer which is not very permeable, avoiding the drawbacks mentioned above.
  • It is characterized in that it comprises the drilling of at least one drain deflected through the underground zone, the intermediate layer and the neighboring zone, and the delayed communication via the drain, the neighboring area and the underground area so as to promote the drainage thereof by said pressurized fluid.
  • the method comprises for example the drilling of a deviated drain drilled through an oil zone of an intermediate zone and an aquifer zone.
  • the method also includes, for example, piercing a deflected drain through an oil zone with an intermediate layer and a second underlying oil zone.
  • the drain is pierced, for example, through an intermediate layer which is not very permeable. It can also be pierced through a non-oil-bearing intermediate layer.
  • the underground zone communicates with the surface by at least one vertical production well whose position relative to the deviated drain is chosen to optimize production.
  • the underground zone communicates with the surface by at least one deviated production well, the position of which is chosen relative to the deviated drain, in order to optimize production.
  • An advantageous start-up is obtained by closing said drain in its deviated part drilled through the underground zone, at least part of the drain constituting a production well.
  • the device according to the invention is characterized in that it comprises a pipe disposed in a deviated drain connecting the underground zone and the neighboring zone, said pipe being provided with openings respectively at each of said layers, a blocking block disposed in the pipe at the intermediate layer and a second sealing block for confining said pipe.
  • a pipe is used for example comprising in its part crossing the underground zone, another portion of length provided with openings, this other portion being laterally offset from the other portion in the underground area and a shutter block disposed in the pipe between the two length portions of the underground area.
  • the oil zone Z1 produces oil by at least one production well P1.
  • This well can be vertical as shown in FIG. 1 or alternatively, horizontal.
  • a layer with very little permeability L there is a neighboring zone containing a fluid under pressure.
  • the pressure of this fluid is greater than the pressure prevailing in the production zone Z1 because the neighboring zone is at a greater depth, but above all because of the partial exhaustion of the oil zone resulting from its exploitation.
  • This fluid can be water or even a fluid tanker.
  • the neighboring area is aquiferous, it is generally of the active type, ie it is supplied by external water supplies and the pressure which reigns there remains substantially constant.
  • the intermediate layer L can for example be an area made almost impermeable due to the presence of very heavy and viscous hydrocarbon products.
  • This layer L can also be of a non-oil type.
  • the method according to the invention comprises drilling from the surface S of a drain D deflected so as to cross the oil zone Z1 horizontally or at an angle slightly inclined with respect to the horizontal.
  • the direction of drilling is bent so that the drain crosses the poorly permeable layer L and enters the neighboring zone Z2.
  • the drain is drilled, it is provided with a casing or casing C over its entire length. Sealing means of a known type allow the annular space between the casing and the drain to be closed in leaktight manner at the level of the layer L for example.
  • the casing C is provided with lateral openings 01 putting the formations crossed into communication with the interior of the casing C. Casing C.
  • a shutter device BP of the type known to specialists under the name of "bridge plug” is lowered in the drain until in the intermediate layer L.
  • a second obturation block BO is also put in place in casing C in the vicinity of the surface for example, to confine this one and isolate it from the outside environment. From the surface installation, by means of a control device not shown, the first shutter block BP is actuated so as to close all communication between the two zones Z1 and Z2.
  • the drain can be drilled at any time, before the production of the oil zone Z1 or possibly during the production period.
  • the surface installation device triggers the opening of the obturation member BP so as to establish communication between the two zones Z1 and Z2.
  • the fluid in this case the water of zone Z2, being at a higher pressure and the drain being confined by the second obturation block BO, the water enters zone Z1 through the openings 01 of the casing C and expels the hydrocarbons accumulated in the formation.
  • the position of the vertical and / or horizontal production wells relative to the deflected drains or vice versa of the drains relative to the wells according to the order in which they will have been drilled, is chosen according to the rules of the art so as to optimize oil production .
  • the drain D is arranged so that it can be used as a production well.
  • the casing C is provided in its deviated part which crosses the production area, with another portion of length d3 provided with lateral orifices 03.
  • this other portion of casing d3 is more or less distant of the portion d1 through which the water coming from the zone Z2 can enter and laterally offset with respect thereto.
  • a shutter member B1 whose closure can be triggered from the surface installation in the same way as the shutter device BP.
  • the BP obturation device is opened and the organ B1 is closed so as to confine the drain D.
  • the water coming from the area under - adjacent Z2 enters the production area Z1 through the openings in part d1 and drives the oil out towards part d3 of the casing C open to the outside environment.
  • the method according to the invention thus makes it possible to best use the high pressure fluid available at depth for the purpose of stimulating oil production.

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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)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Catching Or Destruction (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Abstract

The underground formation and the adjacent zone are for example an oil bearing stratum (Z1) and a subjacent aquifer (Z2) at a pressure greater than that in this layer (Z1). The method essentially consists in drilling at least one deviated drain hole (D) (preferably horizontal or almost horizontal) traversing the oil bearing layer, the adjacent zone and the intermediate layer (L) which is for example a zone made to have low permeability because of the presence of heavy and viscous hydrocarbon products. The drain hole is fitted with a pipe (C) pierced by orifices (01, 02) at the level of the two zones (Z1, Z2) and with stopping units (BP, BO). The delayed opening of the unit (BP) during production, allows the injection of water under pressure into the oil bearing layer and a better draining of the formation. <??>Application to the exploitation of oil bearing strata, for example. <IMAGE>

Description

La présente invention concerne une méthode pour stimuler une zone souterraine par injection différée de fluide sous pression provenant d'une zone voisine que l'on relie à la première au moyen d'un drain dévié traversant une couche intermédiaire très peu perméable. Dans toute la suite de ce texte, on désignera par drain dévié tout forage dont une partie au moins est horizontale ou relativement peu inclinée par rapport à l'horizontale.The present invention relates to a method for stimulating an underground zone by delayed injection of pressurized fluid from a neighboring zone which is connected to the first by means of a deflected drain passing through an intermediate layer which is very slightly permeable. Throughout the rest of this text, the term “diverted drain” will designate any borehole of which at least part is horizontal or relatively slightly inclined relative to the horizontal.

La méthode selon l'invention permet plus particulièrement de stimuler la production d'une zone pétrolifère séparée d'une zone sous-jacente contenant un fluide sous pression, telle qu'une zone aquifère ou éventuellement pétrolifère.The method according to the invention more particularly makes it possible to stimulate the production of an oil zone separated from an underlying zone containing a pressurized fluid, such as an aquiferous zone or possibly an oil zone.

Diverses techniques bien connues des spécialistes sont utilisées pour stimuler la production des zones pétrolifères. L'une d'entre elles consiste essentiellement à injecter un fluide sous pression dans la formation en production, capable de draîner le pétrole stagnant dans les roches en raison de sa viscosité. Le fluide employé est par exemple de l'eau sous pression injectée par des drains forés au travers de la formation. Il peut s'agir aussi d'eau existant en profondeur, dans le bassin en production lui-même sous la forme d'une nappe aquifère sous-jacente.Various techniques well known to specialists are used to stimulate the production of oil zones. One of them essentially consists in injecting a pressurized fluid into the production formation, capable of draining the stagnant oil in the rocks because of its viscosity. The fluid used is for example pressurized water injected by drains drilled through the formation. It can also be water existing deep in the production basin itself in the form of an underlying aquifer.

Dans certains types de bassin, la nappe aquifère se trouve sous la zone pétrolifère et séparée d'elle par une couche très peu perméable en raison notamment de la présence de produits hydrocarbonés lourds et très visqueux ("tarmat"). On peut envisager d'utiliser cette eau sous-jacente pour stimuler la production d'une zone pétrolifère. La nappe d'eau étant localisée à une profondeur supérieure à celle de la zone pétrolifère, sa pression est supérieure. L'épuisement au moins partiel de la zone en production a pour effet d'accroître la surpression de l'eau dans la nappe sous-jacente par rapport aux fluides de la zone supérieure. L'injection éventuelle dans la formation pétrolière de cette eau en surpression doit permettre de drainer l'huile et de favoriser la production.In certain types of basin, the aquifer lies beneath the oil zone and separated from it by a layer which is very slightly permeable due in particular to the presence of heavy and very viscous hydrocarbon products ("tarmat"). We can consider using this underlying water to stimulate the production of an oil zone. The water table being located at a depth greater than that of the oil zone, its pressure is higher. Exhaustion at least partial of the area in production has the effect of increasing the overpressure of the water in the underlying tablecloth compared to the fluids of the upper area. The possible injection into the oil formation of this overpressure water must make it possible to drain the oil and to promote production.

Les tentatives de stimulation des zones de production surmontant des nappes aquifères n'ont pas donné jusqu'ici les résultats escomptés. Des puits ou des drains verticaux ont été percés au travers de la zone pétrolifère, de manière à mettre le gisement pétrolifère en communication avec la nappe d'eau. Mais on a constaté que ce type de puits produisait essentiellement de l'eau. On peut expliquer ce résultat négatif par le fait que l'eau de la nappe a tendance à s'échapper directement vers la surface par le puits ainsi créé au lieu de pénétrer dans la formation pétrolifère. Ce phénomène persiste si l'on descend dans le puits un organe d'obturation car l'eau de la nappe à tendance à le contourner au travers des formations environnantes. Une obturation éventuelle du puits en surface amène une certaine diffusion de l'eau dans la zone pétrolifère. Mais les résultats ne sont pas très significatifs car le volume du gisement pénétré par l'eau reste relativement faible.Attempts to stimulate production areas above aquifers have so far not produced the expected results. Vertical wells or drains were drilled through the oil zone, so as to put the oil deposit in communication with the water table. However, it has been found that this type of well mainly produces water. This negative result can be explained by the fact that the water in the aquifer tends to escape directly to the surface through the well thus created instead of entering the oil formation. This phenomenon persists if a shutter member is lowered into the well because the water in the aquifer tends to bypass it through the surrounding formations. A possible plugging of the surface well leads to a certain diffusion of water in the oil zone. But the results are not very significant because the volume of the deposit penetrated by the water remains relatively small.

La méthode selon l'invention permet de stimuler la production d'une zone souterraine par injection différée d'un fluide provenant d'une zone voisine séparée de la première par une couche intermédiaire peu perméable, en évitant les inconvénients ci-dessus mentionnés.The method according to the invention makes it possible to stimulate the production of an underground zone by delayed injection of a fluid coming from a neighboring zone separated from the first by an intermediate layer which is not very permeable, avoiding the drawbacks mentioned above.

Elle est caractérisée en ce qu'elle comporte le forage d'au moins un drain dévié au travers de la zone souterraine, de la couche intermédiaire et de la zone voisine, et la mise en communication différée par l'intermédiaire du drain, de la zone voisine et de la zone souterraine de manière à favoriser le drainage de celle-ci par ledit fluide sous pression.It is characterized in that it comprises the drilling of at least one drain deflected through the underground zone, the intermediate layer and the neighboring zone, and the delayed communication via the drain, the neighboring area and the underground area so as to promote the drainage thereof by said pressurized fluid.

La méthode comporte par exemple le percement d'un drain dévié percé au travers d'une zone pétrolifère d'une zone intermédiaire et d'une zone aquifère.The method comprises for example the drilling of a deviated drain drilled through an oil zone of an intermediate zone and an aquifer zone.

La méthode comporte aussi par exemple le percement d'un drain dévié au travers d'une zone pétrolifère d'une couche intermédiaire et d'une seconde zone pétrolifère sous-jacente.The method also includes, for example, piercing a deflected drain through an oil zone with an intermediate layer and a second underlying oil zone.

Le drain est percé par exemple au travers d'une couche intermédiaire très peu perméable. Il peut encore être percé au travers d'une couche intermédiaire non pétrolifère.The drain is pierced, for example, through an intermediate layer which is not very permeable. It can also be pierced through a non-oil-bearing intermediate layer.

Suivant un exemple de mise en oeuvre la zone souterraine communique avec la surface par au moins un puits de production vertical dont la position relativement au drain dévié est choisie pour optimiser la production.According to an example of implementation, the underground zone communicates with the surface by at least one vertical production well whose position relative to the deviated drain is chosen to optimize production.

Suivant un autre exemple de mise en oeuvre la zone souterraine communique avec la surface par au moins un puits de production dévié dont la position est choisie relativement au drain dévié, pour optimiser la production.According to another example of implementation, the underground zone communicates with the surface by at least one deviated production well, the position of which is chosen relative to the deviated drain, in order to optimize production.

Une mise en production avantageuse est obtenue en obturant ledit drain dans sa partie déviée forée au travers de la zone souterraine, une partie au moins du drain constituant un puits de production.An advantageous start-up is obtained by closing said drain in its deviated part drilled through the underground zone, at least part of the drain constituting a production well.

Avec un seul drain on peut donc remplir deux fonctions, la mise en communication différée de la formation avec le fluide de stimulation et la collecte des effluents pétroliers libérés par la stimulation, au niveau où le drain traverse la formation.With a single drain, two functions can therefore be fulfilled, the delayed communication of the formation with the stimulation fluid and the collection of petroleum effluents released by the stimulation, at the level where the drain crosses the formation.

Le dispositif selon l'invention est caractérisé en ce qu'il comporte une conduite disposée dans un drain dévié reliant la zone souterraine et la zone voisine, ladite conduite étant pourvue d'ouvertures respectivement au niveau de chacune desdites couches, un bloc d'obturation disposé dans la conduite au niveau de la couche intermédiaire et un deuxième bloc d'obturation pour confiner ladite conduite.The device according to the invention is characterized in that it comprises a pipe disposed in a deviated drain connecting the underground zone and the neighboring zone, said pipe being provided with openings respectively at each of said layers, a blocking block disposed in the pipe at the intermediate layer and a second sealing block for confining said pipe.

Dans le mode de mise en oeuvre où le drain sert à collecter la production induite par la stimulation on utilise par exemple une conduite comportant dans sa partie traversant la zone souterraine, une autre portion de longueur pourvue d'ouvertures, cette autre portion étant latéralement décalée par rapport à l'autre portion dans la zone souterraine et un bloc d'obturation disposé dans la conduite entre les deux portions de longueur de la zone souterraine.In the embodiment where the drain is used to collect the production induced by the stimulation, a pipe is used for example comprising in its part crossing the underground zone, another portion of length provided with openings, this other portion being laterally offset from the other portion in the underground area and a shutter block disposed in the pipe between the two length portions of the underground area.

L'injection de fluide sous pression dans une zone souterraine telle qu'un gisement pétrolier dont la pression interne est affaiblie du fait de la production, par l'ouverture différée du drain incliné convenablement confiné pour empêcher le fluide de s'échapper vers la surface, a pour effet de pousser l'huile vers les puits producteurs. L'utilisation d'un drain dévié (horizontal ou faiblement incliné sur l'horizontale permet d'augmenter le volume de la zone envahie par le fluide injecté. Lorsque la zone voisine est une zone aquifère active c'est-à-dire réalimentée en permanence par des entrées d'eau, la pression d'injection ne subit aucune chute sensible durant toute la phase de drainage. L'effet obtenu est plus durable.The injection of pressurized fluid into an underground zone such as an oil field whose internal pressure is weakened due to production, by the delayed opening of the inclined drain suitably confined to prevent the fluid from escaping to the surface , has the effect of pushing the oil towards the producing wells. The use of a deviated drain (horizontal or slightly inclined on the horizontal makes it possible to increase the volume of the zone invaded by the injected fluid. When the neighboring zone is an active aquifer zone, that is to say replenished with permanently through water inlets, the injection pressure does not undergo any significant drop during the entire drainage phase.The effect obtained is more lasting.

D'autres caractéristiques et avantages de la méthode selon l'invention apparaîtront mieux à la lecture de la description ci-après d'un mode de réalisation décrit à titre d'exemple non limitatif, en se référant aux dessins annexés où:

  • - la Fig.1 montre de façon schématique une coupe d'une zone de production pétrolière surmontant une zone contenant un fluide sous pression, telle qu'une zone aquifère. et un premier mode de réalisation de la méthode selon l'invention; et
  • - la Fig.2 montre schématiquement la même coupe avec un deuxième mode de réalisation de la méthode.
Other characteristics and advantages of the method according to the invention will appear more clearly on reading the description below of an embodiment described by way of nonlimiting example, with reference to the appended drawings where:
  • - Fig.1 shows schematically a section of an oil production area surmounting an area containing a pressurized fluid, such as an aquifer area. and a first embodiment of the method according to the invention; and
  • - Fig.2 shows schematically the same section with a second embodiment of the method.

La zone pétrolifère Z1 produit du pétrole par au moins un puits de production P1. Ce puits peut être vertical comme indiqué sur la Fig. 1 ou bien encore selon les cas, horizontal. Dans certains bassins, au-dessous de la zone pétrolifère Z1 et séparée d'elle par une couche très peu perméable L, se trouve une zone voisine renfermant un fluide sous pression. La pression de ce fluide est supérieure à la pression régnant dans la zone de production Z1 du fait que la zone voisine est à une profondeur plus grande, mais surtout du fait de l'épuisement partiel de la zone pétrolifère résultant de son exploitation. Ce fluide peut être de l'eau ou bien encore un fluide pétrolier. Quand la zone voisine est aquifère, elle est généralement du type actif i.e. elle est alimentée par des apports d'eau extérieurs et la pression qui y règne reste sensiblement constante. La couche intermédiaire L peut être par exemple une zone rendue presque imperméable en raison de la présence de produits hydrocarbonés très lourds et visqueux. Cette couche L peut aussi être d'un type non pétrolifère.The oil zone Z1 produces oil by at least one production well P1. This well can be vertical as shown in FIG. 1 or alternatively, horizontal. In certain basins, below the oil zone Z1 and separated from it by a layer with very little permeability L, there is a neighboring zone containing a fluid under pressure. The pressure of this fluid is greater than the pressure prevailing in the production zone Z1 because the neighboring zone is at a greater depth, but above all because of the partial exhaustion of the oil zone resulting from its exploitation. This fluid can be water or even a fluid tanker. When the neighboring area is aquiferous, it is generally of the active type, ie it is supplied by external water supplies and the pressure which reigns there remains substantially constant. The intermediate layer L can for example be an area made almost impermeable due to the presence of very heavy and viscous hydrocarbon products. This layer L can also be of a non-oil type.

La méthode selon l'invention comporte le forage depuis la surface S d'un drain D dévié de manière à traverser la zone pétrolifère Z1 à l'horizontale ou suivant un angle faiblement incliné par rapport à l'horizontale. La direction de forage est infléchie de manière que le drain traverse la couche peu perméable L et pénètre dans la zone voisine Z2. Quand le drain est foré, il est pourvu d'un cuvelage ou casing C sur toute sa longueur. Des moyens d'obturation d'un type connu permettent de fermer de façon étanche l'espace annulaire entre le casing et le drain au niveau de la couche L par exemple. Sur au moins une portion 11 de sa longueur, là où il traverse la zone de production, le casing C est pourvu d'ouvertures latérales 01 mettant les formations traversées en communication avec l'intérieur du cuvelage ou casing C. De la même façon, au moins une portion d2 du cuvelage ou casing C dans sa partie forée au travers de la zone voisine Z2, est pourvue aussi d'ouvertures latérales 02. Une fois le cuvelage C en place, un dispositif d'obturation BP du type connu des spécialistes sous le nom de "bridge plug" est descendu dans le drain jusque dans la couche intermédiaire L. Un deuxième bloc d'obturation BO est également mis en place dans le casing C au voisinage de la surface par exemple, pour confiner celui-ci et l'isoler du milieu extérieur. Depuis l'installation de surface, au moyen d'un dispositif de commande non représenté, on actionne le premier bloc d'obturation BP de manière à fermer toute communication entre les deux zones Z1 et Z2.The method according to the invention comprises drilling from the surface S of a drain D deflected so as to cross the oil zone Z1 horizontally or at an angle slightly inclined with respect to the horizontal. The direction of drilling is bent so that the drain crosses the poorly permeable layer L and enters the neighboring zone Z2. When the drain is drilled, it is provided with a casing or casing C over its entire length. Sealing means of a known type allow the annular space between the casing and the drain to be closed in leaktight manner at the level of the layer L for example. Over at least a portion 11 of its length, where it crosses the production zone, the casing C is provided with lateral openings 01 putting the formations crossed into communication with the interior of the casing C. Casing C. In the same way, at least a portion d2 of the casing or casing C in its part drilled through the neighboring zone Z2, is also provided with lateral openings 02. Once the casing C is in place, a shutter device BP of the type known to specialists under the name of "bridge plug" is lowered in the drain until in the intermediate layer L. A second obturation block BO is also put in place in casing C in the vicinity of the surface for example, to confine this one and isolate it from the outside environment. From the surface installation, by means of a control device not shown, the first shutter block BP is actuated so as to close all communication between the two zones Z1 and Z2.

Le drain peut être foré à tout moment, avant la mise en production de la zone Z1 pétrolifère ou éventuellement au cours de la période de production.The drain can be drilled at any time, before the production of the oil zone Z1 or possibly during the production period.

Au cours de cette période de production, quand il s'avère que la zone Z1 nécessite une stimulation, on déclenche depuis l'installation de surface, l'ouverture de l'organe d'obturation BP de manière à établir une communication entre les deux zones Z1 et Z2. Le fluide, en l'occurrence l'eau de la zone Z2, se trouvant à une pression supérieure et le drain se trouvant confiné par le deuxième bloc d'obturation BO, l'eau pénètre dans la zone Z1 par les ouvertures 01 du casing C et chasse les hydrocarbures accumulés dans la formation.During this production period, when it turns out that zone Z1 requires stimulation, the surface installation device triggers the opening of the obturation member BP so as to establish communication between the two zones Z1 and Z2. The fluid, in this case the water of zone Z2, being at a higher pressure and the drain being confined by the second obturation block BO, the water enters zone Z1 through the openings 01 of the casing C and expels the hydrocarbons accumulated in the formation.

La position des puits de production verticaux et/ou horizontaux relativement aux drains déviés ou inversement des drains par rapport aux puits selon l'ordre dans lequel ils auront été forés, est choisie selon les règles de l'art de manière à optimiser la production pétrolière.The position of the vertical and / or horizontal production wells relative to the deflected drains or vice versa of the drains relative to the wells according to the order in which they will have been drilled, is chosen according to the rules of the art so as to optimize oil production .

Suivant le mode de réalisation de la Fig.2, le drain D est agencé de manière à pouvoir être utilisé comme puits de production. A cet effet, le cuvelage C est pourvu dans sa partie déviée qui traverse la zone de production, d'une autre portion de longueur d3 pourvue d'orifices latéraux 03. Selon les cas, cette autre portion de cuvelage d3 est plus ou moins distante de la portion d1 par où peut rentrer l'eau provenant de la zone Z2 et latéralement décalée par rapport à celle-ci. Entre les deux portions d1 et d3 ouvertes toutes les deux dans la zone Z1, est disposé un organe B1 d'obturation dont la fermeture peut être déclenchée depuis l'installation de surface de la même façon que le dispositif d'obturation BP.According to the embodiment of Fig.2, the drain D is arranged so that it can be used as a production well. For this purpose, the casing C is provided in its deviated part which crosses the production area, with another portion of length d3 provided with lateral orifices 03. Depending on the case, this other portion of casing d3 is more or less distant of the portion d1 through which the water coming from the zone Z2 can enter and laterally offset with respect thereto. Between the two portions d1 and d3, both open in the zone Z1, is disposed a shutter member B1 whose closure can be triggered from the surface installation in the same way as the shutter device BP.

Au cours de la période de production, quand une stimulation de la production est néccessaire, on ouvre le dispositif d'obturation BP et l'on ferme l'organe B1 de manière à confiner le drain D. L'eau issue de la zone sous-jacente Z2, pénètre dans la zone de production Z1 par les ouvertures de la partie d1 et chasse l'huile vers la partie d3 du cuvelage C ouverte sur le milieu extérieur.During the production period, when production stimulation is necessary, the BP obturation device is opened and the organ B1 is closed so as to confine the drain D. The water coming from the area under - adjacent Z2, enters the production area Z1 through the openings in part d1 and drives the oil out towards part d3 of the casing C open to the outside environment.

La méthode selon l'invention permet ainsi d'utiliser au mieux le fluide à haute pression disponible en profondeur à des fins de stimulation de production pétrolière.The method according to the invention thus makes it possible to best use the high pressure fluid available at depth for the purpose of stimulating oil production.

Claims (10)

Méthode pour stimuler la production d'une zone souterraine (Z1) séparée d'une zone voisine (Z2) contenant un fluide sous pression par une couche intermédiaire (L), caractérisée en ce qu'elle comporte - le forage d'au moins un drain dévié (D) au travers de la zone souterraine, de la couche intermédiaire et de la zone voisine la portion du drain traversant ladite zone souterraine étant très fortement déviée par rapport à la verticale sur une partie au moins de sa longueur; et, - la mise en communication différée par l'intermédiaire du drain, de la zone voisine (Z2) et de la zone souterraine (Z1) de manière à favoriser le drainage de celle-ci par ledit fluide sous pression. Method for stimulating the production of an underground zone (Z1) separated from a neighboring zone (Z2) containing a pressurized fluid by an intermediate layer (L), characterized in that it comprises - the drilling of at least one deviated drain (D) through the underground zone, the intermediate layer and the neighboring zone, the portion of the drain crossing said underground zone being very strongly deviated with respect to the vertical on a part at less than its length; and, - the delayed communication via the drain, the neighboring zone (Z2) and the underground zone (Z1) so as to promote the drainage of the latter by said pressurized fluid. Méthode selon la revendication 1, caractérisée en ce que le drain dévié est percé au travers d'une zone pétrolifère, d'une couche intermédiaire et d'une zone aquifère.Method according to claim 1, characterized in that the deflected drain is pierced through an oil zone, an intermediate layer and an aquifer zone. Méthode selon la revendication 1, caractérisée en ce que le drain dévié (D) est percé au travers d'une zone pétrolifère, d'une couche intermédiaire et d'une deuxième zone pétrolifère sous-jacente.Method according to claim 1, characterized in that the deviated drain (D) is pierced through an oil zone, an intermediate layer and a second underlying oil zone. Méthode selon l'une des revendications précédentes, caractérisée en ce que le drain est percé au travers d'une couche intermédiaire très peu perméable.Method according to one of the preceding claims, characterized in that the drain is pierced through an intermediate layer which is not very permeable. Méthode selon la revendication 4, caractérisée en ce que le drain dévié est percé au travers d'une couche intermédiaire non pétrolifère.Method according to claim 4, characterized in that the deflected drain is pierced through a non-oil-bearing intermediate layer. Méthode selon l'une des revendications précédentes, caractérisée en ce que la zone souterraine (Z1) communique avec la surface par au moins un puits de production vertical dont la position relativement au drain dévié est choisie pour optimiser la production.Method according to one of the preceding claims, characterized in that the underground zone (Z1) communicates with the surface by at least one vertical production well whose position relative to the deviated drain is chosen to optimize production. Méthode selon la revendication 4 ou 5, caractérisée en ce que la zone souterraine communique avec la surface par au moins un puits de production dévié dont la position est choisie relativement au drain dévié, pour optimiser la production.Method according to claim 4 or 5, characterized in that the underground zone communicates with the surface by at least one deviated production well, the position of which is chosen relative to the deviated drain, in order to optimize production. Méthode selon l'une des revendications précédentes, caractérisée en ce que l'on obture ledit drain dans sa partie déviée forée au travers de la zone souterraine (Z1), une partie au moins du drain constituant un puits de production.Method according to one of the preceding claims, characterized in that the said drain is closed in its deviated part drilled through the underground zone (Z1), at least part of the drain constituting a production well. Dispositif pour stimuler la production d'une zone souterraine (Z1) séparée d'une zone adjacente (Z2) contenant du fluide à une pression supérieure à celle de la zone pétrolifère, par une couche (L) très peu perméable, caractérisé en ce qu'il comporte une conduite (C) disposée dans un drain dévié (D) reliant la zone souterraine et la zone adjacente, ladite conduite (C) comportant des portions de longueur (d1, d2) pourvues d'ouvertures (01, 02) respectivement au niveau de chacune desdites zones, un bloc d'obturation (BP) disposé dans la conduite au niveau de la couche intermédiaire et un deuxième bloc d'obturation (BO) pour confiner une partie au moins de ladite conduite (C).Device for stimulating the production of an underground zone (Z1) separated from an adjacent zone (Z2) containing fluid at a pressure higher than that of the oil zone, by a layer (L) which is very slightly permeable, characterized in that '' it comprises a pipe (C) arranged in a deviated drain (D) connecting the underground zone and the adjacent zone, said pipe (C) comprising length portions (d1, d2) provided with openings (01, 02) respectively at each of said zones, a sealing block (BP) disposed in the pipe at the level of the intermediate layer and a second sealing block (BO) for confining at least part of said pipe (C). Dispositif selon la revendication 9, caractérisé en ce que la conduite (C) comporte dans sa partie traversant la zone souterraine (Z1), une autre portion de longueur (d3) pourvue d'ouvertures (03), cette autre portion étant latéralement décalée par rapport à l'autre portion (d2) dans la zone souterraine et un bloc d'obturation (B1) disposé dans la conduite (C) entre les deux portions de longueur (d1, d3) de la zone souterraine (Z1).Device according to claim 9, characterized in that the pipe (C) comprises, in its part crossing the underground zone (Z1), another portion of length (d3) provided with openings (03), this other portion being laterally offset by relative to the other portion (d2) in the underground zone and a shutter block (B1) disposed in the pipe (C) between the two length portions (d1, d3) of the underground zone (Z1).
EP90403557A 1989-12-29 1990-12-12 Method and device for stimulation of an underground formation by injection of a fluid coming from an adjacent zone being connected to the first one by a drain hole transversing a low-permeable intermediate layer Expired - Lifetime EP0435727B1 (en)

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FR8917481A FR2656650B1 (en) 1989-12-29 1989-12-29 METHOD AND DEVICE FOR STIMULATING A SUBTERRANEAN ZONE BY CONTROLLED INJECTION OF FLUID FROM A NEIGHBORING AREA WHICH IS CONNECTED TO THE FIRST BY A DRAIN THROUGH A LITTLE PERMEABLE LAYER.
FR8917481 1989-12-29

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EP0435727B1 EP0435727B1 (en) 1995-05-24

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US (1) US5133411A (en)
EP (1) EP0435727B1 (en)
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CN102900402A (en) * 2012-11-01 2013-01-30 中国海洋石油总公司 Development method of offshore small-scale gas reservoir
CN102913203A (en) * 2012-11-01 2013-02-06 中国海洋石油总公司 Method for developing low-permeability gas reservoir
CN102926719A (en) * 2012-11-01 2013-02-13 中国海洋石油总公司 Method for exploiting abnormally high-pressure gas deposit
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CN102900402A (en) * 2012-11-01 2013-01-30 中国海洋石油总公司 Development method of offshore small-scale gas reservoir
CN102913203A (en) * 2012-11-01 2013-02-06 中国海洋石油总公司 Method for developing low-permeability gas reservoir
CN102926719A (en) * 2012-11-01 2013-02-13 中国海洋石油总公司 Method for exploiting abnormally high-pressure gas deposit
CN102943654A (en) * 2012-11-01 2013-02-27 中国海洋石油总公司 Method for improving recovery efficiency of high-hydrocarbon-content gas deposit by high-CO2-content gas deposit
CN102913203B (en) * 2012-11-01 2014-05-07 中国海洋石油总公司 Method for developing low-permeability gas reservoir
CN102900402B (en) * 2012-11-01 2014-05-07 中国海洋石油总公司 Development method of offshore small-scale gas reservoir
US10890059B2 (en) 2018-02-07 2021-01-12 Petrochina Company Limited Layered water injection system and layered water injection method

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NO905593D0 (en) 1990-12-27
DE69019709T2 (en) 1995-09-21
NO905593L (en) 1991-07-01
EP0435727B1 (en) 1995-05-24
DK0435727T3 (en) 1995-08-07
US5133411A (en) 1992-07-28
NO301090B1 (en) 1997-09-08
CA2033357C (en) 2001-09-11
FR2656650A1 (en) 1991-07-05
CA2033357A1 (en) 1991-06-30
FR2656650B1 (en) 1995-09-01
DE69019709D1 (en) 1995-06-29

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