WO1993001391A1 - Method and device for evaluating the production quality of a well, particularly an oil well - Google Patents
Method and device for evaluating the production quality of a well, particularly an oil well Download PDFInfo
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- WO1993001391A1 WO1993001391A1 PCT/FR1992/000622 FR9200622W WO9301391A1 WO 1993001391 A1 WO1993001391 A1 WO 1993001391A1 FR 9200622 W FR9200622 W FR 9200622W WO 9301391 A1 WO9301391 A1 WO 9301391A1
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- well
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- flow meter
- shutter
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
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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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/008—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by injection test; by analysing pressure variations in an injection or production test, e.g. for estimating the skin factor
Definitions
- the present invention relates to methods and devices which make it possible to evaluate the production quality of a well, in particular of oil, essentially in the portion of subsoil in which the well is made.
- oil is produced from wells that are made in oil fields, and that these oil fields are found in many different types of soil and subsoil which do not all have the same quality of production. This quality depends essentially on the quantity of oil available or recoverable, but also on the permeability of the ground in which it is trapped, that is to say the ease with which the oil can flow to the well to be then extracted according to techniques known in themselves.
- the present invention aims to overcome the drawbacks mentioned above and to implement a method for evaluating the production quality of an oil well or the like, which, while being easy to implement, allows obtain this assessment at all levels of the well, using measures that can be interpreted with a small percentage of errors or uncertainty.
- the present invention also aims to provide a device for implementing this method.
- the subject of the present invention is a method for determining a value representative of the production quality of an oil well or the like as a function of the permeability and clogging of the oil layers, said method being implemented by means of a flow meter, a pressure sensor and of a controllable shutter and being characterized in that it consists: in lowering into said well an assembly comprising said flowmeter, pressure sensor and controllable shutter, up to the level of the layers enclosing said oil, said assembly being lowered into said well so that said pressure sensor and flow meter are located below said controllable shutter, to periodically control said shutter so as to modulate the value of the section of said well in the vicinity of said oil layers, to measure the variations in flow of oil using said flow meter, to measure variations in oil pressure using the pressure sensor, and to deduce, from the comparison of the variations in oil flow and pressure, values respectively representative of the permeability and the clogging.
- the single figure represents, seen in schematic section, an oil well 1.
- This well is dug in a soil 2 up to the layers 3 enclosing the oil.
- these layers are formed of permeable sands or rocks which are located below impermeable layers. The oil is thus confined in these permeable layers and can be extracted provided that the well penetrates to them.
- the oil can flow to the well by decompression of the hydrocarbons and spout out of the head of the well, or be brought up to the surface by pumping. if the pressure is not sufficient.
- This controllable shutter can for example consist of a sleeve comprising fins which can be deployed by means of '' a motor controllable from a distant point. It can also be constituted by a plurality of walls arranged with one another to form a cone at variable angle, the sliding of the walls with respect to each other being able to be controlled by means of a towing cable.
- this controllable shutter can consist of an enclosure with a deformable wall, the interior of which can be supplied with fluid by means of a pump connecting it to a reserve of fluid. By controlling the pump in one direction or the other, the inflation or deflation of the enclosure can be controlled to obtain a modulation of the passage section of the duct in which it is arranged.
- a flow meter is known in itself and can be schematically constituted by a sleeve in which is arranged a measurer comprising a propeller and means for counting the number of turns of this propeller, with this sleeve possibly being associated with a deflector in order to capture all the oil flowing in the conduit 6 and force it to pass entirely through the sleeve.
- the flow meter 7 is arranged to deliver at its output 8 a signal representative of the flow of the fluid passing through it.
- a pressure sensor 9 well known in itself, for example with strain gauge or advantageously quartz, capable of delivering at its output 10 a signal representative of the pressure of the fluid measured.
- these three elements are assembled with each other so that they can be lowered from the wellhead 11 by any connecting means, for example a cable 12 or the like, to the level of the oil layers 3. They are also combined so that, when they are lowered into the well as shown in the single FIGURE, the flow meter 7 and the pressure sensor 9 are located below the controllable shutter 5.
- these three elements are connected by a bus line 13 which allows, from an organ 14, to control the shutter 5, possibly the start of the flow meter 7 and the pressure sensor 9, but also to receive and process the signals emitted by these last two elements.
- the method according to the invention for evaluating the permeability and the clogging of the oil layers 3, then consists in controlling the shutter 5 to vary the section of the duct 6 between two minimum and maximum values according to a determined periodic mathematical law, advantageously sinusoidal, the minimum value not being zero so as never to completely block the conduit 6 and to allow the oil to continue to flow during the entire measurement time.
- the flow meter 7 and the pressure sensor 9 are switched on for a few periods of the mathematical function of the shutter control. They deliver at their outputs signals respectively representative of the variations in flow and pressure in the oil flow occurring in the well below the shutter 5, but at the location of the two other elements.
- the curves of these variations are periodic functions of the same period as that of the control of the shutter 5, but out of phase with one another.
- the measurement of the phase shift between these two signals makes it possible to deduce a value which is representative of the permeability of the layers which are below the controllable shutter, at the level of the flow meter and of the pressure sensor, and the ratio of the amplitudes of these curves. allows to deduce a value which is representative of clogging.
- This process is interesting for two reasons because, in addition to assessing the permeability and clogging within the oil layers, and therefore eliminating many uncertainties inherent in the methods according to the prior art, it also makes it possible to assess this permeability and the clogging at all levels of an oil layer. It is specified that, by plugging, one understands as well the phenomenon which slows down the flow of oil as that which favors it as in particular the appearance of natural cracks, or not, which stimulate the productivity of the well.
- the device advantageously comprises coramandable means for securing the controllable shutter 5 with the wall of the well so as to keep it in place at the desired level.
- These controllable means can be of any kind, and in particular legs of small thickness whose deployment can be controlled by motor or cable so that they come to anchor in the wall of the well, at the desired level.
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
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- Analytical Chemistry (AREA)
- Examining Or Testing Airtightness (AREA)
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Abstract
Description
Procédé et dispositif pour évaluer la qualité de production d'un puits, notamment de pétrole Method and device for evaluating the production quality of a well, in particular of oil
La présente invention concerne les procédés et les dispositifs qui permettent d'évaluer la qualité de production d'un puits, notamment de pétrole, essentiellement dans la portion de sous-sol dans laquelle est réalisé le puits. On sait que le pétrole est produit à partir de puits qui sont réalisés dans les champs pétrolifères, et que ces champs pétrolifères se trouvent dans de nombreux différents types de sol et sous-sol qui n'ont pas tous la même qualité de production. Cette qualité dépend essentiellement de la quantité de pétrole disponible ou récupérable, mais aussi de la perméabilité du terrain dans lequel il se trouve emprisonné, c'est-à-dire la facilité avec laquelle le pétrole peut s'écouler jusqu'au puits pour être ensuite extrait selon des techniques connues en elle-mêmes.The present invention relates to methods and devices which make it possible to evaluate the production quality of a well, in particular of oil, essentially in the portion of subsoil in which the well is made. We know that oil is produced from wells that are made in oil fields, and that these oil fields are found in many different types of soil and subsoil which do not all have the same quality of production. This quality depends essentially on the quantity of oil available or recoverable, but also on the permeability of the ground in which it is trapped, that is to say the ease with which the oil can flow to the well to be then extracted according to techniques known in themselves.
Afin d'optimiser la production d'un puits, notamment de pétrole, il est donc utile de connaître la qualité de ce puits, notamment en déterminant la valeur de certains paramètres prédéfinis. Un paramètre important est la perméabilité des couches du sous-sol dans lequel le puits a été foré, car elle permet d'évaluer la facilité avec laquelle le pétrole s'écoule à travers ces couches. La connais- sance, au cours du temps, de cette perméabilité permet en outre de surveiller l'évolution de la qualité de production du puits et d'intervenir, notamment au fond de celui-ci, s'il se produit une variation de cette perméabilité au niveau de la paroi du puits située dans les couches pétrolifères, et plus particulièrement dans le cas d'une diminution qui semblerait anormale.In order to optimize the production of a well, in particular of oil, it is therefore useful to know the quality of this well, in particular by determining the value of certain predefined parameters. An important parameter is the permeability of the layers of the subsoil in which the well was drilled, because it allows to assess the ease with which the oil flows through these layers. Knowing, over time, this permeability also makes it possible to monitor the evolution of the production quality of the well and to intervene, particularly at the bottom of the latter, if there is a variation in this permeability at the level of the wall of the well located in the oil layers, and more particularly in the case of a reduction which would seem abnormal.
En effet, on constate parfois une chute de la production. Ce phénomène peut avoir plusieurs raisons dont les plus courantes sont l'épuisement du gisement ou la modification de la perméabilité au voisinage de la paroi du puits. II est bien évident que, lorsque le gisement est épuisé, il n'y a pas de possibilité d'intervention. Par contre, lorsque cette chute de production est due à une modification de la porosité de la paroi du puits par suite de la formation d'une couche de colmatage, il est parfois possible d'intervenir.Indeed, there is sometimes a drop in production. This phenomenon can have several reasons, the most common of which are the exhaustion of the deposit or the modification of the permeability in the vicinity of the wall of the well. It is quite obvious that, when the deposit is exhausted, there is no possibility of intervention. On the other hand, when this drop in production is due to a change in the porosity of the wall of the well as a result of the formation of a sealing layer, it is sometimes possible to intervene.
Dans cette hypothèse, il est important de pouvoir discriminer la formation d'une couche de colmatage par rapport à un épuisement du gisement, afin d'intervenir le plus tôt possible de façon utile pour éliminer la couche de colmatage et continuer l'exploitation du puits.In this hypothesis, it is important to be able to discriminate the formation of a clogging layer compared to a depletion of the deposit, in order to intervene as soon as possible in a useful way to remove the clogging layer and continue operating the well. .
Pour effectuer la surveillance de la qualité de production d'un puits, il a été mis au point différents procédés. La plupart des anciens procédés sont fondés sur l'utilisation de relations empiriques ou statistiques entre différentes mesures qui peuvent être effectuées sur un tel puits de production. Un autre procédé donnant des résultats plus précis consiste à obturer complètement le puits à sa sortie et à étudier la montée en pression du pétrole dans le puits en fonction du temps de fermeture. En effet, de l'examen des courbes de variation de la pression, il est possible de déduire si le puits est en fin de production ou s'il est colmaté.To monitor the production quality of a well, various procedures have been developed. Most of the old methods are based on the use of empirical or statistical relationships between different measurements which can be carried out on such a production well. Another method giving more precise results consists in completely closing the well at its exit and in studying the increase in pressure of the oil in the well as a function of the closing time. Indeed, from the examination of the pressure variation curves, it is possible to deduce if the well is at the end of production or if it is clogged.
Ce procédé permet d'obtenir un bon résultat, mais présente l'inconvénient majeur d'être très long à être mis en oeuvre. Pour obtenir une courbe exploitable, il faut en effet attendre un temps non négligeable qui peut atteindre, pour certains puits, des heures sinon des jours, pendant lesquels le puits n'est pas exploité.This process makes it possible to obtain a good result, but has the major drawback of being very long to be implemented. To obtain an exploitable curve, it is indeed necessary to wait for a non-negligible time which can reach, for certain wells, hours if not days, during which the well is not exploited.
Pour pallier cet inconvénient, on a alors tenté de mettre au point un autre procédé qui consiste à moduler la fermeture du puits à sa sortie et à étudier la variation de pression du fluide en fonction de cette modulation. Ce procédé élimine l'inconvénient mentionné ci-dessus de la fermeture totale du puits, mais présente alors l'inconvénient de ne pas conduire à des mesures assez précises.To overcome this drawback, an attempt was then made to develop another method which consists in modulating the closing of the well at its outlet and in studying the variation in pressure of the fluid as a function of this modulation. This process eliminates the above-mentioned drawback of completely closing the well, but then has the drawback of not leading to fairly precise measurements.
La présente invention a pour but de pallier les inconvénients mentionnés ci-dessus et de mettre en oeuvre un procédé pour évaluer la qualité de production d'un puits de pétrole ou analogue, qui, tout en étant facile à mettre en oeuvre, permette d'obtenir cette évaluation à tous les niveaux du puits, à l'aide de mesures qui peuvent être interprétées avec un faible pourcentage d'erreurs ou d'incertitude.The present invention aims to overcome the drawbacks mentioned above and to implement a method for evaluating the production quality of an oil well or the like, which, while being easy to implement, allows obtain this assessment at all levels of the well, using measures that can be interpreted with a small percentage of errors or uncertainty.
La présente invention a aussi pour but de réaliser un dispositif permettant de mettre en oeuvre ce procédé.The present invention also aims to provide a device for implementing this method.
Plus précisément, la présente invention a pour objet un procédé pour déterminer une valeur représentative de la qualité de production d'un puits de pétrole ou analogue en fonction de la perméabilité et du colmatage des couches pétrolifères, ledit procédé étant mis en oeuvre au moyen d'un débitmètre, d'un capteur de pression et d'un obturateur commandable et étant caractérisé par le fait qu'il consiste : à descendre dans ledit puits un ensemble comportant lesdits débitmètre, capteur de pression et obturateur commandable, jusqu'au niveau des couches enfermant ledit pétrole, ledit ensemble étant descendu dans ledit puits de façon que lesdits capteur de pression et débitmètre soient situés au-dessous dudit obturateur commandable, à commander de façon périodique ledit obturateur de façon à moduler la valeur de la section dudit puits au voisinage desdites couches pétrolifères, à mesurer les variations de débit du pétrole au moyen dudit débitmètre, à mesurer les variations de pression du pétrole au moyen du capteur de pression, et à déduire, de la comparaison des variations de débit et de pression du pétrole, des valeurs respectivement représentatives de la perméabilité et du colmatage.More specifically, the subject of the present invention is a method for determining a value representative of the production quality of an oil well or the like as a function of the permeability and clogging of the oil layers, said method being implemented by means of a flow meter, a pressure sensor and of a controllable shutter and being characterized in that it consists: in lowering into said well an assembly comprising said flowmeter, pressure sensor and controllable shutter, up to the level of the layers enclosing said oil, said assembly being lowered into said well so that said pressure sensor and flow meter are located below said controllable shutter, to periodically control said shutter so as to modulate the value of the section of said well in the vicinity of said oil layers, to measure the variations in flow of oil using said flow meter, to measure variations in oil pressure using the pressure sensor, and to deduce, from the comparison of the variations in oil flow and pressure, values respectively representative of the permeability and the clogging.
D'autres caractéristiques et avantages de la présente invention apparaîtront au cours de la description suivante donnée en regard des dessins annexés à titre illustratif, mais nullement limitatif, dans lesquels la Figure unique représente, sous forme schématique, un mode de réalisation d'un dispositif permettant de mettre en oeuvre le procédé selon l'invention.Other characteristics and advantages of the present invention will become apparent during the following description given with reference to the drawings annexed by way of illustration, but in no way limiting, in which the single figure represents, in schematic form, an embodiment of a device. allowing the method according to the invention to be implemented.
La figure unique représente, vu en coupe schématique, un puits de pétrole 1. Ce puits est creusé dans un sol 2 jusqu'aux couches 3 enfermant le pétrole. D'une façon générale, ces couches sont formées de roches ou sables perméables qui se situent en dessous de couches imperméables. Le pétrole est ainsi confiné dans ces couches perméables et peut être extrait à condition que le puits pénètre jusqu'à elles.The single figure represents, seen in schematic section, an oil well 1. This well is dug in a soil 2 up to the layers 3 enclosing the oil. Generally, these layers are formed of permeable sands or rocks which are located below impermeable layers. The oil is thus confined in these permeable layers and can be extracted provided that the well penetrates to them.
Quand ces couches perméables sont atteintes, le pétrole peut s'écouler vers le puits par décompression des hydrocarbures et jaillir hors de la tête du puits, ou être remonté vers la surface par pompage si la pression n'est pas suffisante.When these permeable layers are reached, the oil can flow to the well by decompression of the hydrocarbons and spout out of the head of the well, or be brought up to the surface by pumping. if the pressure is not sufficient.
Il est ainsi évident que l'un des paramètres définissant la qualité de production d'un puits est la valeur de la perméabilité des couches dans lesquelles se trouve confiné le pétrole. Pour évaluer la valeur de cette perméabilité, on utilise un ensemble de moyens qui sont :It is thus obvious that one of the parameters defining the production quality of a well is the value of the permeability of the layers in which the oil is confined. To assess the value of this permeability, a set of means is used which are:
- un obturateur commandable 5 permettant de moduler la valeur de la section de passage du conduit 6 que forme le puits au niveau des couches pétrolifères 3. Cet obturateur commandable peut par exemple être constitué par un manchon comportant des ailettes qui peuvent être déployées au moyen d'un moteur commandable à partir d'un point éloigné. Il peut aussi être constitué par une pluralité de parois agencées les unes avec les autres pour former un cône à angle variable, le coulissement des parois les unes par rapport aux autres pouvant être commandé au moyen d'un câble tracteur. Avantageusement, cet oburateur commandable peut être constitué par une enceinte à paroi déformable dont l'intérieur peut être alimenté en fluide au moyen d'une pompe le reliant à une réserve de fluide. En commandant la pompe dans un sens ou dans l'autre, on peut commander le gonflement ou le dégonflement de l'enceinte pour obtenir une modulation de la section de passage du conduit dans lequel elle est disposée.- a controllable shutter 5 making it possible to modulate the value of the passage cross section of the conduit 6 formed by the well at the level of the oil layers 3. This controllable shutter can for example consist of a sleeve comprising fins which can be deployed by means of '' a motor controllable from a distant point. It can also be constituted by a plurality of walls arranged with one another to form a cone at variable angle, the sliding of the walls with respect to each other being able to be controlled by means of a towing cable. Advantageously, this controllable shutter can consist of an enclosure with a deformable wall, the interior of which can be supplied with fluid by means of a pump connecting it to a reserve of fluid. By controlling the pump in one direction or the other, the inflation or deflation of the enclosure can be controlled to obtain a modulation of the passage section of the duct in which it is arranged.
- un débitmètre 7 de fluide comme le pétrole, pour mesurer le débit du pétrole qui s'écoule dans le conduit 6. Un tel débitmètre est connu en lui-même et peut être constitué schématiquement par un manchon dans lequel est disposé un mesureur comportant une hélice et des moyens pour comptabiliser le nombre de tours de cette hélice, à ce manchon pouvant être éventuellement associé un déflecteur afin de capter l'ensemble du pétrole s'écoulant dans le conduit 6 et le forcer à passer entièrement dans le manchon. Le débitmètre 7 est agencé pour délivrer à sa sortie 8 un signal représentatif du débit du fluide qui le traverse.- A flow meter 7 of fluid such as petroleum, for measuring the flow of petroleum flowing in the conduit 6. Such a flow meter is known in itself and can be schematically constituted by a sleeve in which is arranged a measurer comprising a propeller and means for counting the number of turns of this propeller, with this sleeve possibly being associated with a deflector in order to capture all the oil flowing in the conduit 6 and force it to pass entirely through the sleeve. The flow meter 7 is arranged to deliver at its output 8 a signal representative of the flow of the fluid passing through it.
- un capteur de pression 9 bien connu en lui-même, par exemple à jauge de contrainte ou avantageusement à quartz, apte à délivrer à sa sortie 10 un signal représentatif de la pression du fluide mesurée. Suivant le procédé selon la présente invention, ces trois éléments sont assemblés les uns avec les autres de façon qu'ils puissent être descendus à partir de la tête de puits 11 par tout moyen de liaison, par exemple un câble 12 ou analogue, jusqu'au niveau des couches pétrolifères 3. Ils sont en outre associés de façon que, lorsqu'ils sont descendus dans le puits comme représenté sur la Figure unique, le débitmètre 7 et le capteur de pression 9 soient situés en dessous de l'obturateur commandable 5. De plus, ces trois éléments sont reliés par une ligne bus 13 qui permet, à partir d'un organe de traitement 14, de commander l'obturateur 5, éventuellement la mise en marche du débitmètre 7 et du capteur de pression 9, mais aussi de recevoir et traiter les signaux émis par ces deux derniers éléments.- A pressure sensor 9 well known in itself, for example with strain gauge or advantageously quartz, capable of delivering at its output 10 a signal representative of the pressure of the fluid measured. According to the method according to the present invention, these three elements are assembled with each other so that they can be lowered from the wellhead 11 by any connecting means, for example a cable 12 or the like, to the level of the oil layers 3. They are also combined so that, when they are lowered into the well as shown in the single FIGURE, the flow meter 7 and the pressure sensor 9 are located below the controllable shutter 5. In addition, these three elements are connected by a bus line 13 which allows, from an organ 14, to control the shutter 5, possibly the start of the flow meter 7 and the pressure sensor 9, but also to receive and process the signals emitted by these last two elements.
Le procédé selon l'invention pour évaluer la perméabilité et le colmatage des couches pétrolifères 3, consiste ensuite à commander l'obturateur 5 pour faire varier la section du conduit 6 entre deux valeurs minimale et maximale suivant une loi mathématique périodique déterminée, avantageusement sinusoïdale, la valeur minimale n'étant pas nulle afin de ne jamais obturer complètement le conduit 6 et de permettre au pétrole de continuer à s'écouler pendant tout le temps des mesures.The method according to the invention for evaluating the permeability and the clogging of the oil layers 3, then consists in controlling the shutter 5 to vary the section of the duct 6 between two minimum and maximum values according to a determined periodic mathematical law, advantageously sinusoidal, the minimum value not being zero so as never to completely block the conduit 6 and to allow the oil to continue to flow during the entire measurement time.
Dans le cas où le débitmètre 7 et le capteur de pression 9 ne sont pas en état de marche permanent, ils sont mis en marche pendant quelques périodes de la fonction mathématique de la commande de l'obturateur. Ils délivrent à leurs sorties des signaux respectivement représentatifs des variations de débit et de pression dans le flux de pétrole se produisant dans le puits en dessous de l'obturateur 5, mais au niveau de l'emplacement des deux autres éléments.In the case where the flow meter 7 and the pressure sensor 9 are not in permanent operating state, they are switched on for a few periods of the mathematical function of the shutter control. They deliver at their outputs signals respectively representative of the variations in flow and pressure in the oil flow occurring in the well below the shutter 5, but at the location of the two other elements.
On constate que les courbes de ces variations sont des fonctions périodiques de même période que celle de la commande de l'obturateur 5, mais déphasées l'une par rapport à l'autre. La mesure du déphasage entre ces deux signaux permet de déduire une valeur qui est représentative de la perméabilité des couches qui se trouvent en dessous de l'obturateur commandable, au niveau du débitmètre et du capteur de pression, et le rapport des amplitudes de ces courbes permet de déduire une valeur qui est représentative du colmatage.It can be seen that the curves of these variations are periodic functions of the same period as that of the control of the shutter 5, but out of phase with one another. The measurement of the phase shift between these two signals makes it possible to deduce a value which is representative of the permeability of the layers which are below the controllable shutter, at the level of the flow meter and of the pressure sensor, and the ratio of the amplitudes of these curves. allows to deduce a value which is representative of clogging.
Ce procédé est intéressant à double titre car, outre qu'il permet d'évaluer la perméabilité et le colmatage au sein même des couches pétrolifères, et donc d'éliminer nombre d'incertitudes inhérentes aux procédés selon l'art antérieur, il permet en plus d'évaluer cette perméabilité et le colmatage à tous les niveaux d'une couche pétrolifère. Il est précisé que, par colmatage, on entend aussi bien le phénomène qui freine l'écoulement du pétrole que celui qui le favorise comme notamment l'apparition de fissures naturelles, ou pas, qui stimulent la productivité du puits.This process is interesting for two reasons because, in addition to assessing the permeability and clogging within the oil layers, and therefore eliminating many uncertainties inherent in the methods according to the prior art, it also makes it possible to assess this permeability and the clogging at all levels of an oil layer. It is specified that, by plugging, one understands as well the phenomenon which slows down the flow of oil as that which favors it as in particular the appearance of natural cracks, or not, which stimulate the productivity of the well.
Pour cela, on peut descendre l'ensemble des éléments au plus profond du puits, effectuer une évaluation de la perméabilité et du colmatage au niveau le plus bas de l'ensemble des couches pétro- li ères, puis remonter par paliers et effectuer à chaque fois de nouvelles mesures. On obtient ainsi une bonne image de la perméabilité et du colmatage des couches pétrolifères suivant toute leur épaisseur. Le procédé décrit ci-dessus est très facile à mettre en oeuvre et permet d'évaluer la perméabilité et le colmatage sans arrêter la production du puits. Il peut donc être régulièrement mis en oeuvre, ce qui permet de suivre l'évolution de la qualité de production du puits tout au long de son exploitation.To do this, we can lower all the elements to the deepest part of the well, carry out an assessment of permeability and clogging at the lowest level of all the oil layers, then go back up in stages and perform each times new measurements. This gives a good picture of the permeability and clogging of the oil layers along their entire thickness. The process described above is very easy to implement and makes it possible to evaluate the permeability and the clogging without stopping the production of the well. It can therefore be regularly implemented, which makes it possible to follow the development of the production quality of the well throughout its exploitation.
Il arrive cependant que le débit de production du pétrole dans un puits soit assez élevé pour qu'il se produise une différence de pression de part et d'autre de l'obturateur commandable telle que cet obturateur ait tendance à être entraîné dans le même mouvement d'ascension que le pétrole. Ce phénomène est un inconvénient pour la précision et la fiabilité des mesures. Pour éliminer ce risque, le dispositif comporte avantageusement des moyens coramandables pour solidariser l'obturateur commandable 5 avec la paroi du puits de façon à le maintenir en place au niveau souhaité. Ces moyens commandables peuvent être de toute nature, et notamment des pattes de faible épaisseur dont le déploiement peut être commandé par moteur ou câble pour qu'elles viennent s'ancrer dans la paroi du puits, au niveau souhaité. However, it happens that the oil production rate in a well is high enough for there to be a pressure difference on either side of the controllable shutter such that this shutter tends to be driven in the same movement of ascent as oil. This phenomenon is a drawback for the precision and reliability of the measurements. To eliminate this risk, the device advantageously comprises coramandable means for securing the controllable shutter 5 with the wall of the well so as to keep it in place at the desired level. These controllable means can be of any kind, and in particular legs of small thickness whose deployment can be controlled by motor or cable so that they come to anchor in the wall of the well, at the desired level.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9108435A FR2678679B1 (en) | 1991-07-05 | 1991-07-05 | METHOD AND DEVICE FOR ASSESSING THE PRODUCTION QUALITY OF A WELL, ESPECIALLY OIL. |
| FR91/08435 | 1991-07-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1993001391A1 true WO1993001391A1 (en) | 1993-01-21 |
Family
ID=9414749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR1992/000622 Ceased WO1993001391A1 (en) | 1991-07-05 | 1992-07-02 | Method and device for evaluating the production quality of a well, particularly an oil well |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0546157A1 (en) |
| JP (1) | JPH06501075A (en) |
| FR (1) | FR2678679B1 (en) |
| WO (1) | WO1993001391A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5351533A (en) * | 1993-06-29 | 1994-10-04 | Halliburton Company | Coiled tubing system used for the evaluation of stimulation candidate wells |
| US7257491B2 (en) | 2002-05-22 | 2007-08-14 | Sondex Plc | Method of determining the per strata reserve quality of an oil well |
| US9551214B2 (en) | 2011-06-10 | 2017-01-24 | Damien Despax | Method for determining the complex response of a permeable stratum |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2817587B1 (en) * | 2000-12-04 | 2003-02-07 | Innov Pro | METHOD AND DEVICE FOR DETERMINING THE RESERVE QUALITY OF AN OIL WELL |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3559476A (en) * | 1969-04-28 | 1971-02-02 | Shell Oil Co | Method for testing a well |
| EP0176410A1 (en) * | 1984-09-07 | 1986-04-02 | Schlumberger Limited | Method for uniquely estimating permeability and skin factor for at least two layers of a reservoir |
| EP0297962A1 (en) * | 1987-07-01 | 1989-01-04 | Schlumberger Limited | Flow restricting logging tool and method |
-
1991
- 1991-07-05 FR FR9108435A patent/FR2678679B1/en not_active Expired - Fee Related
-
1992
- 1992-07-02 EP EP92914680A patent/EP0546157A1/en not_active Withdrawn
- 1992-07-02 JP JP5502014A patent/JPH06501075A/en active Pending
- 1992-07-02 WO PCT/FR1992/000622 patent/WO1993001391A1/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3559476A (en) * | 1969-04-28 | 1971-02-02 | Shell Oil Co | Method for testing a well |
| EP0176410A1 (en) * | 1984-09-07 | 1986-04-02 | Schlumberger Limited | Method for uniquely estimating permeability and skin factor for at least two layers of a reservoir |
| EP0297962A1 (en) * | 1987-07-01 | 1989-01-04 | Schlumberger Limited | Flow restricting logging tool and method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5351533A (en) * | 1993-06-29 | 1994-10-04 | Halliburton Company | Coiled tubing system used for the evaluation of stimulation candidate wells |
| US7257491B2 (en) | 2002-05-22 | 2007-08-14 | Sondex Plc | Method of determining the per strata reserve quality of an oil well |
| US9551214B2 (en) | 2011-06-10 | 2017-01-24 | Damien Despax | Method for determining the complex response of a permeable stratum |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2678679A1 (en) | 1993-01-08 |
| FR2678679B1 (en) | 1993-10-29 |
| JPH06501075A (en) | 1994-01-27 |
| EP0546157A1 (en) | 1993-06-16 |
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