EP2865810B1 - Improvements to devices for applying pressure to the wall of a well - Google Patents
Improvements to devices for applying pressure to the wall of a well Download PDFInfo
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- EP2865810B1 EP2865810B1 EP14290274.1A EP14290274A EP2865810B1 EP 2865810 B1 EP2865810 B1 EP 2865810B1 EP 14290274 A EP14290274 A EP 14290274A EP 2865810 B1 EP2865810 B1 EP 2865810B1
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- 238000003825 pressing Methods 0.000 title claims 2
- 239000012530 fluid Substances 0.000 claims description 23
- 230000001413 cellular effect Effects 0.000 claims description 3
- 239000000523 sample Substances 0.000 description 19
- 238000006073 displacement reaction Methods 0.000 description 6
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000013013 elastic material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
Definitions
- the present invention relates to an improvement to devices for pressurizing a portion of the wall of a well for carrying out load tests of a land in which the well is drilled.
- CPV Volume Pressure Controller
- Such a system essentially comprises a so-called "tri-cellular” probe consisting of a so-called “central” cell comprising a feed inlet, and two so-called “guard” cells each comprising a feed inlet, these guard cells bordering in contact with the central cell respectively substantially at its two opposite ends, a first incompressible fluid source with an output fluidically connected to the supply input of the central cell, and a second source of compressible fluid having an output fluidically connected to the inputs feeding respectively the two guard cells.
- This tri-cellular probe is also generally, but not necessarily, substantially annular in shape and is located on the wall of a borehole or inside a lantern tube placed inside a borehole. a cross section smaller than the cross section of the borehole.
- the drill pipe with the bare tri-cellular probe or in a lantern tube, positioned as defined above is lowered into the well so that the probe is at the part of the soil to be tested.
- the method for measuring the loads that a terrain can withstand with a device as briefly described above generally gives good results but it does not allow, if necessary, very precise measurements, or to vary so very easy, reliable and perfectly determined, the volume of incompressible fluid in the central cell of the tri-cellular probe.
- the object of the present invention is to carry out an improvement to the device described above, to enable it to apply very high pressures in order to obtain better results than those it allows to get.
- the present invention relates to a device for pressurizing a portion of the wall of a well having the characteristics set forth in appended claim 1.
- the present invention relates to a device for pressurizing a portion of the wall 1 of a well 2 for, in particular, performing static loading tests of the terrain 3 in which the well is made by means of a radially expandable probe introduced in the well.
- the device comprises, with reference to the single FIGURE, a probe which, in the illustrated embodiment, is a tri-cellular probe 10. But this probe could be of a single-cell type, well known in itself. which is deduced without any difficulty from this tri-cellular probe illustrated and described hereinafter by way of example.
- This tri-cellular probe consists essentially of a so-called "central” cell 11 comprising a feed inlet 16 and two so-called “guard” cells 12, 13 each comprising a feed inlet 17, 18, these two feed cells. guard bordering the central cell 11 in contact, that is to say with common wall portions, respectively substantially at its two opposite ends 14, 15.
- the three cells 11, 12, 13 of the tri-cellular probe 10 have walls of elastic material and some wall portions are common, as shown in the single figure, between the guard cells 12, 13 and the central cell 11 According to a preferred embodiment, this elastic material is rubber.
- the device further comprises a first incompressible fluid source 20 such as water or the like, with an outlet 21, first means 22 for fluidically connecting the outlet 21 of the first source 20 to the feed inlet 16 of the central cell 11, for example a rigid wall pipe and relatively undeformable at least under pressures of the order of those used for the implementation of the device.
- a first incompressible fluid source 20 such as water or the like
- first means 22 for fluidically connecting the outlet 21 of the first source 20 to the feed inlet 16 of the central cell 11, for example a rigid wall pipe and relatively undeformable at least under pressures of the order of those used for the implementation of the device.
- This first source 20 consists of a primary source 100 capable of delivering, at an outlet 43, an incompressible primary fluid under a pressure value Pp and a pressure amplifier 200 to bring the pressure value Pp to a value of Pto pressure greater than Pp, this pressure amplifier further comprising input means 201 fluidly connected to the output 43 of the primary source 100 and the output means 202, these output means 202 constituting in fact the output 21 of the first source of incompressible fluid 20.
- the primary source 100 is constituted, as illustrated in the single figure, by a jack 40 comprising a cylinder chamber 41 defined along a longitudinal axis 42, this cylinder chamber comprising a supply outlet 43, this output of supply 43 being located substantially at a first 44 of the two ends 44, 45 of the cylinder chamber.
- the jack also comprises a piston 46 mounted to slide sealingly in the cylinder chamber 41 by delimiting therein two parts 47, 50 with variable volume as a function of the displacement of the piston 46, a first portion 47 able to be filled with an incompressible primary fluid. and which has the power output 43, and a second portion 50 which does not include this power output 43.
- the jack also comprises a control rod 48 and means for linking a first end 49 of the control rod to the piston 46 so that the control rod is located at least partially in the second portion 50 of the cylinder chamber 41.
- means for linking a first end 49 of the control rod 48 to the piston 46 may be of different types: welding, screwing, interlocking, etc.
- the device further comprises means 60 for controlling the translation of the control rod 48 substantially along the longitudinal axis 42 so as to slide the piston 46 into the chamber cylinder 41 of a predetermined quantity, which will be predetermined by the skilled person to perform the tests that he wishes to perform.
- the sliding of the piston 46 will consequently vary at least the volume of the portion 47 of the cylinder chamber 41, this volume variation being in fact proportional to the translation of the piston.
- the length of the latter is determined so that, whatever the position of the piston 46 in the cylinder chamber 41, the second end 51 of this rod emerges from the second end 45 of the cylinder chamber 41, which allows easy handling.
- the means 60 for controlling the translation of the control rod 48 in one direction or the other comprise motor means 61 comprising a shaft outlet 62 adapted to be rotated about an axis of rotation 63, and coupling means 64 of the output shaft 62 with the control rod portion 48 emerging from the cylinder chamber 41.
- These coupling means 64 have the function of transforming a rotation of the output shaft 62 into a translation of the control rod.
- these coupling means 64 consist of a ball screw 65 mounted in cooperation with the control rod, and a mechanical speed reducer, for example of the gear type 66 or the like, with two inputs, a first input being connected to the ball screw 65 the second input being linked to the output shaft 62.
- a ball screw is a mechanism for converting a rotational movement into a translational movement, usually a helical link. Such a ball screw is well known in itself and will not be more fully described here.
- the pressure amplifier 200 As for the pressure amplifier 200 defined above, it consists of a first cylinder 212, a second piston 211 slidably mounted in this first cylinder delimiting a first variable volume chamber 210 fluidly connected by the input means 201 to the supply outlet 43 of the primary source 100 described above, a second cylinder 222 having the output means 202, a third piston 221 slidably mounted in the second cylinder by delimiting a second variable volume chamber 220 filled with an incompressible fluid which may be of the same type as the primary fluid that fills the portion 47 of the first chamber 41 defined above, and means 230 for connecting the second and third pistons 211, 221 so that the displacement of the third piston 221 is a function of the displacement of the second piston 211.
- these means 230 for connecting the second and third pistons 211, 221 consist of a rigid and solid connection depending on the pressures that are required, so that the displacement of the third piston 221 is equal to the displacement of the second. piston 211.
- the rigid connection 230 consists of a rigid and solid rod whose two ends are respectively integral with the second and third pistons 211, 221.
- first and second cylinders 212, 222 are coaxial and integral with each other, as illustrated in the single figure attached.
- the device comprises, as in the prior art when the cellular probe is a tri-cellular probe such as that illustrated in the single figure, a second source of compressible fluid such as gas, generally air, having an outlet 31, and second means 32 for fluidically connecting the output 31 of the second source to the supply inputs 17, 18 respectively of the two guard cells 12, 13, these second fluid connection means 32 being of the same nature as the first means 22 defined above.
- a second source of compressible fluid such as gas, generally air
- the device may further comprise a central core 70 having a cross section smaller than the cross section of the well 2 and the tri-cellular probe 10 then has a substantially annular shape and is situated on the outer wall 72 of this central core 70 to be in the well 2, in the space 71 between the outer wall of the central core and the wall 1 of the well 2.
- This central core 70 is generally fixedly positioned at one end of an operating rod which serves to lower the device in the well 2.
- the second source of compressible fluid 30 consists of a reserve of the compressible fluid, such as a cylinder of gas well known in itself, having an outlet and an adjustable pressure regulator connected to this outlet for adjusting the pressure of the gas to a desired value that the skilled person knows to determine.
- the device according to the invention has, compared to the previous devices, the following advantage: its structure allows it to be used with one or other of the two types of probe, single or triple for example, by delivering a pressure of 1000 bar for a single-cell probe, and a pressure of 500 bar for a tri-cellular probe.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
La présente invention concerne un perfectionnement aux dispositifs permettant de mettre en pression une partie de la paroi d'un puits pour la réalisation d'essais de chargement d'un terrain dans lequel est foré ce puits.The present invention relates to an improvement to devices for pressurizing a portion of the wall of a well for carrying out load tests of a land in which the well is drilled.
Pour construire quelque immeuble ou analogue que ce soit sur un terrain, il est préférable de vérifier au moins que ce terrain pourra supporter un tel immeuble, c'est-à-dire sa "charge". Pour ce faire, l'une des solutions possibles est de réaliser un puits dans le sol et de mesurer les charges qu'il peut supporter, en d'autres termes d'évaluer les déformations du sol quand il est soumis à des pressions données.To build any building or the like on a lot, it is better to check at least that this land will support such a building, that is to say its "load". To do this, one of the possible solutions is to make a well in the ground and to measure the loads that it can support, in other words to evaluate the deformations of the soil when it is subjected to given pressures.
C'est ainsi que l'on connaît un système qui est généralement désigné, par la Société GEOMATECH, sous le vocable CPV (Contrôleur Pression Volume).Thus we know a system that is generally designated by the GEOMATECH Company, under the term CPV (Volume Pressure Controller).
L'art antérieur dans ce domaine est illustré par le contenu du
Un tel système comporte essentiellement une sonde dite "tri-cellulaire" constituée d'une cellule dite "centrale" comprenant une entrée d'alimentation, et deux cellules dites de "garde" comprenant chacune une entrée d'alimentation, ces cellules de garde bordant au contact la cellule centrale respectivement sensiblement à ses deux extrémités opposées, une première source de fluide incompressible avec une sortie reliée fluidiquement à l'entrée d'alimentation de la cellule centrale, et une seconde source de fluide compressible comportant une sortie reliée fluidiquement aux entrées d'alimentation respectivement des deux cellules de garde.Such a system essentially comprises a so-called "tri-cellular" probe consisting of a so-called "central" cell comprising a feed inlet, and two so-called "guard" cells each comprising a feed inlet, these guard cells bordering in contact with the central cell respectively substantially at its two opposite ends, a first incompressible fluid source with an output fluidically connected to the supply input of the central cell, and a second source of compressible fluid having an output fluidically connected to the inputs feeding respectively the two guard cells.
Cette sonde tri-cellulaire est en outre généralement, mais pas nécessairement, de forme sensiblement annulaire et est située sur la paroi d'un forage ou à l'intérieur d'un tube lanterné placé à l'intérieur d'un forage, d'une section transversale inférieure à la section transversale du forage.This tri-cellular probe is also generally, but not necessarily, substantially annular in shape and is located on the wall of a borehole or inside a lantern tube placed inside a borehole. a cross section smaller than the cross section of the borehole.
Pour effectuer des essais de chargement du terrain dans lequel est foré le puits, la tige de forage avec la sonde tri-cellulaire nue ou dans un tube lanterné, positionnée comme défini ci-dessus, est descendue dans le puits de façon que la sonde se trouve au niveau de la partie du sol à tester.To perform loading tests of the land in which the well is drilled, the drill pipe with the bare tri-cellular probe or in a lantern tube, positioned as defined above, is lowered into the well so that the probe is at the part of the soil to be tested.
Puis, au moyen d'une source de fluide incompressible, par exemple une bâche d'eau mise en pression par un gaz sous pression, la cellule centrale est elle-même mise en pression. L'étude des variations de pression dans la bâche, ou de niveau d'eau dans cette bâche, permet de façon connue de déterminer la valeur du chargement du terrain dans lequel se trouve la sonde tri-cellulaire. Ce procédé est bien connu depuis longtemps et, comme il n'entre pas dans le champ de protection de la présente invention, il ne sera pas plus amplement développé ici.Then, by means of a source of incompressible fluid, for example a sheet of water pressurized by a gas under pressure, the central cell is itself pressurized. The study of variations in pressure in the sheet, or water level in this sheet, allows in known manner to determine the value of the loading of the ground in which the tri-cellular probe is located. This method has been well known for a long time and, since it does not fall within the scope of the present invention, it will not be further developed here.
Le procédé pour mesurer les charges qu'un terrain peut supporter avec un dispositif tel que succinctement décrit ci-dessus donne en général de bons résultats mais il ne permet pas, si elles sont nécessaires, des mesures très précises, ni de faire varier de façon très aisée, fiable et parfaitement déterminée, le volume de fluide incompressible dans la cellule centrale de la sonde tri-cellulaire.The method for measuring the loads that a terrain can withstand with a device as briefly described above generally gives good results but it does not allow, if necessary, very precise measurements, or to vary so very easy, reliable and perfectly determined, the volume of incompressible fluid in the central cell of the tri-cellular probe.
Aussi, la présente invention a-t-elle pour but de réaliser un perfectionnement au dispositif décrit ci-dessus, pour lui permettre d'appliquer de très hautes pressions dans le but d'obtenir de meilleurs résultats que ceux qu'il permet d'obtenir.Also, the object of the present invention is to carry out an improvement to the device described above, to enable it to apply very high pressures in order to obtain better results than those it allows to get.
Plus précisément, la présente invention a pour objet un dispositif permettant de mettre en pression une partie de la paroi d'un puits ayant les caractéristiques énoncées dans la revendication 1 annexée.More specifically, the present invention relates to a device for pressurizing a portion of the wall of a well having the characteristics set forth in appended claim 1.
D'autres caractéristiques et avantages de la présente invention apparaîtront au cours de la description suivante donnée en regard du dessin annexé à titre illustratif mais nullement limitatif, dans lequel :
- La figure unique représente le schéma bloc d'un mode de réalisation du dispositif selon l'invention permettant de mettre en pression une partie de la paroi d'un puits pour la réalisation d'essais de chargement du terrain dans lequel est foré ce puits.
- The single figure shows the block diagram of an embodiment of the device according to the invention for pressurizing a portion of the wall of a well for carrying out load tests of the land in which is drilled this well.
Il est tout d'abord précisé que, dans la présente description, si l'adverbe "sensiblement" est associé à un qualificatif d'un moyen donné, ce qualificatif doit être compris au sens strict ou approché.It is first of all specified that, in the present description, if the adverb "substantially" is associated with a qualifier of a given means, this qualifier must be understood in the strict sense or approached.
La présente invention concerne un dispositif permettant de mettre en pression une partie de la paroi 1 d'un puits 2 pour, notamment, la réalisation d'essais de chargement statique du terrain 3 dans lequel est réalisé ce puits grâce à une sonde dilatable radialement introduite dans le puits.The present invention relates to a device for pressurizing a portion of the wall 1 of a
De tels essais permettent d'obtenir une courbe de variation des informations volumétriques du terrain en fonction de la contrainte appliquée, et de définir une relation contrainte-déformation du terrain pour en déduire trois paramètres images qui sont connus des hommes du métier, à savoir (i) un module de déformation du sol, (ii) une pression dite de fluage, et (iii) une pression limite.Such tests make it possible to obtain a curve of variation of the volumetric information of the terrain as a function of the applied stress, and to define a stress-strain relationship of the terrain to deduce three image parameters which are known to those skilled in the art, namely ( i) a modulus of deformation of the soil, (ii) a so-called creep pressure, and (iii) a limiting pressure.
Les procédures permettant d'obtenir ces paramètres sont bien connues en elles-mêmes et ne seront pas plus amplement décrites ici, d'autant plus qu'elles n'entrent pas dans le champ de protection de l'invention qui concerne le dispositif pour les mettre en oeuvre.The procedures making it possible to obtain these parameters are well known in themselves and will not be further described here, especially since they do not fall within the scope of the invention which concerns the device for enforce.
Ceci ayant été exposé, le dispositif comporte, par référence à la figure unique, une sonde qui, dans le mode de réalisation illustré, est une sonde tri-cellulaire 10. Mais cette sonde pourrait être de type monocellulaire, bien connue en elle-même, qui se déduit sans aucune difficulté de cette sonde tri-cellulaire illustrée et décrite ci-après à titre d'exemple.Having said this, the device comprises, with reference to the single FIGURE, a probe which, in the illustrated embodiment, is a tri-cellular
Cette sonde tri-cellulaire est essentiellement constituée d'une cellule dite "centrale" 11 comprenant une entrée d'alimentation 16 et deux cellules dites "de garde" 12, 13 comprenant chacune une entrée d'alimentation 17, 18, ces deux cellules de garde bordant la cellule centrale 11 au contact, c'est-à-dire à parties de parois communes, respectivement sensiblement à ses deux extrémités opposées 14, 15.This tri-cellular probe consists essentially of a so-called "central"
Les trois cellules 11, 12, 13 de la sonde tri-cellulaire 10 ont des parois en un matériau élastique et certaines parties de parois sont communes, comme illustré sur la figure unique, entre les cellules de garde 12, 13 et la cellule centrale 11. Selon une réalisation préférentielle, ce matériau élastique est du caoutchouc.The three
Le dispositif comporte en outre une première source de fluide incompressible 20 comme de l'eau ou analogue, avec une sortie 21, des premiers moyens 22 pour relier fluidiquement la sortie 21 de la première source 20 à l'entrée d'alimentation 16 de la cellule centrale 11, par exemple une conduite à paroi rigide et relativement indéformable au moins sous des pressions de l'ordre de celles qui sont utilisées pour la mise en oeuvre du dispositif.The device further comprises a first
Cette première source 20 est constituée d'une source primaire 100 apte à délivrer, à une sortie 43, un fluide primaire incompressible sous une pression de valeur Pp et d'un amplificateur de pression 200 pour amener la valeur de pression Pp à une valeur de pression Pto supérieure à Pp, cet amplificateur de pression comportant en outre des moyens d'entrée 201 reliés fluidiquement à la sortie 43 de la source primaire 100 et des moyens de sortie 202, ces moyens de sortie 202 constituant en fait la sortie 21 de la première source de fluide incompressible 20.This
Selon une réalisation très préférentielle, la source primaire 100 est constituée, comme illustré sur la figure unique, par un vérin 40 comprenant une chambre cylindre 41 définie selon un axe longitudinal 42, cette chambre cylindre comprenant une sortie d'alimentation 43, cette sortie d'alimentation 43 étant située sensiblement à une première 44 des deux extrémités 44, 45 de la chambre cylindre.According to a very preferred embodiment, the
Le vérin comporte aussi un piston 46 monté coulissant de façon étanche dans la chambre cylindre 41 en y délimitant deux parties 47, 50 à volume variable en fonction du déplacement du piston 46, une première partie 47 apte à être remplie d'un fluide primaire incompressible et qui comporte la sortie d'alimentation 43, et une seconde partie 50 qui, elle, ne comprend pas cette sortie d'alimentation 43.The jack also comprises a
Le vérin comporte aussi une tige de commande 48 et des moyens pour lier une première extrémité 49 de la tige de commande au piston 46 de façon que la tige de commande soit située au moins partiellement dans la seconde partie 50 de la chambre cylindre 41. Ces moyens pour lier une première extrémité 49 de la tige de commande 48 au piston 46 peuvent être de différents types : soudure, vissage, emboîtement, etc...The jack also comprises a
Le dispositif comporte en outre des moyens 60 pour commander la translation de la tige de commande 48 sensiblement suivant l'axe longitudinal 42 de façon à faire coulisser le piston 46 dans la chambre cylindre 41 d'une quantité déterminée, qui sera prédéterminée par l'homme du métier pour réaliser les essais qu'il souhaite effectuer. Le coulissement du piston 46 va faire varier en conséquence au moins le volume de la partie 47 de la chambre cylindre 41, cette variation de volume étant en fait proportionnelle à la translation du piston.The device further comprises means 60 for controlling the translation of the
Selon une réalisation avantageuse qui facilite la manoeuvre de la tige de commande 48, la longueur de cette dernière est déterminée de façon que, quelle que soit la position du piston 46 dans la chambre cylindre 41, la seconde extrémité 51 de cette tige émerge de la seconde extrémité 45 de la chambre cylindre 41, ce qui permet de la manipuler facilement.According to an advantageous embodiment which facilitates the operation of the
Cependant, selon une réalisation particulièrement avantageuse, les moyens 60 pour commander la translation la tige de commande 48 dans un sens ou dans l'autre (augmentation ou diminution du volume de la partie de chambre cylindre 47) comportent des moyens moteurs 61 comprenant un arbre de sortie 62 apte à être animé en rotation autour d'un axe de rotation 63, et des moyens de couplage 64 du l'arbre de sortie 62 avec la partie 52 de tige de commande 48 émergeant de la chambre cylindre 41.However, according to a particularly advantageous embodiment, the
Ces moyens de couplage 64 ont pour fonction de transformer une rotation de l'arbre de sortie 62 en une translation de la tige de commande.These coupling means 64 have the function of transforming a rotation of the
Dans une réalisation qui est très préférentielle et particulièrement avantageuse, tant sur le plan de la simplicité de sa mise en oeuvre que sur celui de la précision qui peut être obtenue pour le déplacement de la tige de commande 48, ces moyens de couplage 64 sont constitués d'une vis à billes 65 montée en coopération avec la tige de commande, et d'un réducteur mécanique de vitesse, par exemple du type à engrenage 66 ou analogue, à deux entrées, une première entrée étant liée à la vis à billes 65, la seconde entrée étant liée à l'arbre de sortie 62.In an embodiment that is very preferential and particularly advantageous, both in terms of the simplicity of its implementation and that of the precision that can be obtained for the displacement of the
Une vis à billes est un mécanisme assurant la conversion d'un mouvement de rotation en un mouvement de translation, généralement par liaison hélicoïdale. Une telle vis à billes est bien connue en elle-même et ne sera pas plus amplement décrite ici.A ball screw is a mechanism for converting a rotational movement into a translational movement, usually a helical link. Such a ball screw is well known in itself and will not be more fully described here.
Quant à l'amplificateur de pression 200 défini ci-avant, il est constitué d'un premier cylindre 212, d'un deuxième piston 211 monté coulissant dans ce premier cylindre en y délimitant une première chambre à volume variable 210 reliée fluidiquement par les moyens d'entrée 201 à la sortie d'alimentation 43 de la source primaire 100 décrite ci-avant, d'un second cylindre 222 comportant les moyens de sortie 202, d'un troisième piston 221 monté coulissant dans ce second cylindre en y délimitant une seconde chambre à volume variable 220 remplie d'un fluide incompressible qui peut être du même type que le fluide primaire qui remplit la partie 47 de la première chambre 41 définie ci-avant, et de moyens 230 pour relier les deuxième et troisième pistons 211, 221 de façon que le déplacement du troisième piston 221 soit fonction du déplacement du deuxième piston 211.As for the
Selon une réalisation préférée, ces moyens 230 pour relier les deuxième et troisième pistons 211, 221 sont constitués d'une liaison rigide et solide en fonction des pressions qui sont demandées, de façon que le déplacement du troisième piston 221 soit égal au déplacement du deuxième piston 211. Quant aux deuxième et troisième pistons eux-mêmes, ils sont réalisés de façon que les aires S2 et S3 de leurs surfaces respectivement soumises aux pressions de fluides Pp et Pto soient liées par la relation suivante :
De façon très avantageuse, la liaison rigide 230 est constituée d'une tige rigide et solide dont les deux extrémités sont respectivement solidaires des deuxième et troisième pistons 211, 221.Very advantageously, the
Selon une réalisation industriellement préférentielle, les premier et second cylindres 212, 222 sont coaxiaux et solidaires l'un de l'autre, comme illustré sur la figure unique jointe.According to an industrially preferred embodiment, the first and
Le dispositif comporte, comme dans l'art antérieur quand la sonde cellulaire est une sonde tri-cellulaire comme celle illustrée sur la figure unique, une seconde source de fluide compressible 30 comme du gaz, généralement de l'air, comportant une sortie 31, et des seconds moyens 32 pour relier fluidiquement la sortie 31 de la seconde source aux entrées d'alimentation 17, 18 respectivement des deux cellules de garde 12, 13, ces seconds moyens de liaison fluidique 32 étant de même nature que les premiers moyens 22 définis ci-dessus.The device comprises, as in the prior art when the cellular probe is a tri-cellular probe such as that illustrated in the single figure, a second source of compressible fluid such as gas, generally air, having an
Dans une réalisation possible, le dispositif peut comporter en outre une âme centrale 70 d'une section transversale inférieure à la section transversale du puits 2 et la sonde tri-cellulaire 10 présente alors une forme sensiblement annulaire et est située sur la paroi extérieure 72 de cette âme centrale 70 pour se trouver dans le puits 2, dans l'espace 71 compris entre la paroi extérieure de l'âme centrale et la paroi 1 du puits 2.In one possible embodiment, the device may further comprise a
Cette âme centrale 70 est généralement positionnée fixement à une extrémité d'une tige de manoeuvre qui sert à descendre le dispositif dans le puits 2.This
Dans la pratique, comme illustré sur la figure jointe, la seconde source de fluide compressible 30 est constituée d'une réserve du fluide compressible, comme une bouteille de gaz bien connue en elle-même, comportant une sortie et un détendeur réglable relié à cette sortie pour ajuster la pression du gaz à une valeur voulue que l'homme du métier sait déterminer.In practice, as illustrated in the attached figure, the second source of
Le fonctionnement du dispositif selon l'invention se déduit du fonctionnement décrit dans le document antérieur référencé ci-dessus sans qu'il soit besoin de le décrire plus spécifiquement ici, dans l'unique souci de simplifier la présente description.The operation of the device according to the invention is deduced from the operation described in the prior document referenced above without the need to describe it more specifically here, for the sole purpose of simplifying the present description.
Il est cependant souligné que le dispositif selon l'invention présente, par rapport aux dispositifs antérieurs, l'avantage suivant : sa structure lui permet d'être utilisé avec l'un ou l'autre des deux types de sonde, monocellulaire ou tri-cellulaire, en délivrant par exemple une pression de 1000 bars pour une sonde monocellulaire, et une pression de 500 bars pour une sonde tri-cellulaire.It is however emphasized that the device according to the invention has, compared to the previous devices, the following advantage: its structure allows it to be used with one or other of the two types of probe, single or triple for example, by delivering a pressure of 1000 bar for a single-cell probe, and a pressure of 500 bar for a tri-cellular probe.
Claims (7)
- A device for applying pressure to a portion of the wall (1) of a borehole (2), the device comprising:• a cellular sonde (10) comprising at least one cell (11) having a feed inlet (16);• a source (20) suitable for delivering an incompressible fluid to an outlet (21) at a pressure of value Pto; and• means (22) for putting the outlet (21) of said source (20) into fluid flow connection with the feed inlet (16) of said cell (11);the device being characterized by the fact that said source (20) is constituted by:• a primary source (100) suitable for delivering an incompressible primary fluid to an outlet (43) at a pressure of value Pp less than the pressure value Pto; and• a pressure amplifier (200) for bringing the pressure value Pp up to the pressure value Pto, the pressure amplifier including inlet means (201) in fluid flow connection with the outlet (43) of the primary source (100) and outlet means (202), the outlet means (202) constituting the outlet (21) of the source (20).
- A device according to claim 1, characterized by the fact that the primary source (100) is constituted by:• an actuator (40) comprising a cylinder chamber (41) defined about a longitudinal axis (42), the cylinder chamber having a feed outlet (43), said feed outlet (43) being situated substantially at a first end (44) of first and second ends (44, 45) of said cylinder chamber, a first piston (46) slidably mounted in leaktight manner in said cylinder chamber (41) so as to define therein two portions (47, 50) of volume that is variable as a function of movement of said first piston (46), a first portion (47) being suitable for being filled with an incompressible primary fluid and including said, feed outlet (43), and a second portion (50) not including said feed outlet, a control rod (48), means for connecting a first end (49) of said control rod to said first piston (46) in such a manner that the control rod is situated at least in part in the second portion (50) of the cylinder chamber (41); and• means (60) for controlling movement in translation of said control rod (48) substantially along said longitudinal axis (42) so as to cause said first piston (46) to slide in the cylinder chamber (41) by a predetermined quantity.
- A device according to claim 1 or claim 2, characterized by the fact that the pressure amplifier (200) is constituted by:• a first cylinder (212);• a second piston (211) slidably mounted in said first cylinder and defining therein a first chamber (210) of variable volume, this first chamber being in fluid flow connection by the inlet means (201) to the feed outlet (43) of the primary source (100);• a second cylinder (222); and• a third piston (221) slidably mounted in said second cylinder and defining therein a second variable volume chamber (220), the second chamber being filled with an incompressible fluid and including the outlet means (202); and• means (230) for connecting the second and third pistons (211, 221) in such a manner that the movement of the third piston (221) is a function of the movement of the second piston (211).
- A device according to claim 3, characterized by the fact that the means for connecting the second and third pistons (211, 221) are constituted by a rigid connection (230) so that the movement of the third piston (221) is equal to the movement of the second piston (211), the areas S2 and S3 of the respective surfaces of the second and third pistons (211, 221) that are subjected to the fluid pressures of respective values Pp and Pto being related by the following relationship:
- A device according to claim 4, characterized by the fact that the rigid connection (230) is constituted by a rigid rod having its two ends secured respectively to the second and third pistons (211, 221).
- A device according to any one of claims 3 to 5, characterized by the fact that the first and second cylinders of the first and second variable volume chambers (212, 222) respectively are on a common axis and secured to each other.
- A device according to any preceding claim, characterized by the fact that said cellular sonde (10) is one of the following sondes: a single-cell sonde, a three-cell sonde.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1302322A FR3011562B1 (en) | 2013-10-07 | 2013-10-07 | IMPROVEMENT TO DEVICES FOR PRESSURIZING THE WALL OF A WELL |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2865810A1 EP2865810A1 (en) | 2015-04-29 |
EP2865810B1 true EP2865810B1 (en) | 2016-05-11 |
Family
ID=49713111
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14290274.1A Active EP2865810B1 (en) | 2013-10-07 | 2014-09-12 | Improvements to devices for applying pressure to the wall of a well |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2865810B1 (en) |
ES (1) | ES2585738T3 (en) |
FR (1) | FR3011562B1 (en) |
PL (1) | PL2865810T3 (en) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2941975B1 (en) * | 2009-02-12 | 2011-02-04 | Gerard Arsonnet | DEVICE FOR PRESSURIZING A PART OF THE WALL OF A WELL |
-
2013
- 2013-10-07 FR FR1302322A patent/FR3011562B1/en active Active
-
2014
- 2014-09-12 PL PL14290274.1T patent/PL2865810T3/en unknown
- 2014-09-12 EP EP14290274.1A patent/EP2865810B1/en active Active
- 2014-09-12 ES ES14290274.1T patent/ES2585738T3/en active Active
Also Published As
Publication number | Publication date |
---|---|
ES2585738T3 (en) | 2016-10-07 |
EP2865810A1 (en) | 2015-04-29 |
PL2865810T3 (en) | 2016-12-30 |
FR3011562B1 (en) | 2015-11-06 |
FR3011562A1 (en) | 2015-04-10 |
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