EP1171767A1 - Device for directing drill hole cores - Google Patents

Device for directing drill hole cores

Info

Publication number
EP1171767A1
EP1171767A1 EP00918965A EP00918965A EP1171767A1 EP 1171767 A1 EP1171767 A1 EP 1171767A1 EP 00918965 A EP00918965 A EP 00918965A EP 00918965 A EP00918965 A EP 00918965A EP 1171767 A1 EP1171767 A1 EP 1171767A1
Authority
EP
European Patent Office
Prior art keywords
bench
cradle
core
magnetic field
revolution
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00918965A
Other languages
German (de)
French (fr)
Inventor
Jean-Pierre Martin
Jean-Pierre Pozzi
Gérard CLERC
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1171767A1 publication Critical patent/EP1171767A1/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/24—Earth materials

Definitions

  • the present invention relates to devices making it possible to orient drill cores which have cylindrical shapes of revolution around an axis of revolution, when these cores have been taken from rocky or similar environments which have been subjected, during their formation , to a terrestrial magnetic field and which therefore have a remanent magnetization, and more particularly the devices which make it possible to orient cores taken from petroleum rocks.
  • the present invention thus aims to provide a device for orienting cores of cylindrical shape of revolution about an axis of revolution, when these cores were taken from a rocky environment or the like and when this environment was subjected during of its formation in a terrestrial magnetic field and that it therefore comprises a remanent magnetization, and more particularly a device which makes it possible to orient cores taken from petroleum rocks, which obviates the drawbacks of similar laboratory devices currently known, in particular by making it possible to carry out, in situ and almost completely automatically, orientation measurements in series on large quantities of carrots, even of relatively great length.
  • the subject of the present invention is a device making it possible to orient cores of cylindrical shape of revolution around an axis of revolution, these cores having been taken from a rocky or similar medium which was subjected, during its formation, to a terrestrial magnetic field and which therefore has a remanent magnetization, characterized in that it comprises:
  • measurement signal means for measuring the magnetic field prevailing at said measurement point, these measurement means being capable of delivering a signal called "measurement signal”, and
  • FIG. 1 represents the block diagram of an embodiment of the device according to the invention in its most complete configuration
  • FIGS. 2, 3 and 4 respectively represent an embodiment of three details of the structure of the device as illustrated diagrammatically in FIG. 1,
  • FIG. 5 represents two diagrams making it possible to explain the operation of the device and the results that can be obtained
  • FIG. 6 represents a core such that it can be extracted from the ground by a core drilling machine
  • FIG. 7 represents the block diagram of an improvement to the embodiment of the device according to FIGS. 1 to 4.
  • FIGS 1 to 4 and 7 show two embodiments of the device according to the invention.
  • the same references designate the same elements there regardless of the figure on which they appear and whatever the form of representation of these elements.
  • Figure 1 shows the block diagram of the device according to the invention in its most complete configuration.
  • the device according to the invention makes it possible to orient cores 1 which are of cylindrical shape of revolution around an axis of revolution 12, these cores having been taken from a rocky environment or the like which was subjected, during its formation, to a terrestrial magnetic field and which therefore has a residual transverse magnetization, FIG. 6, that is to say a magnetization which can be represented by a vector "V,” perpendicular to the axis of revolution 12 of the carrot .
  • the device comprises a bench 2 of oblong shape, a cradle 3, means 4 for associating the cradle 3 with the bench, means 7 for driving the core 1 in rotation substantially around its axis of revolution 12 relative to the cradle when the cradle is located on a first portion 5 of the bench 2, so that the side wall 9 of the core passes substantially through a point 10 called “measuring point”, means 8 for measuring the magnetic field prevailing at this measurement point 10, these measurement means being capable of delivering a signal called “measurement signal”, and means 11 to process this measurement signal.
  • the means 8 for measuring the magnetic field prevailing at the measurement point 10 are constituted by at least a first magnetometer 21 capable of delivering at output 22 a first signal representative of the value of the magnetic field measured at this point of measurement, this first signal constituting the measurement signal.
  • the Applicant has in particular obtained very good results with the magnetometer marketed by the Scintrex Company under the reference SMG4.
  • the means 8 for measuring the magnetic field prevailing at the measurement point 10 then further comprise a second magnetometer 23 associated with the first, FIG. 2, so that it is capable of measuring the prevailing magnetic field, not at the measurement point 10 , but in the vicinity of this measurement point, that is to say in a relatively close location, to avoid interference between these two magnetometers.
  • the first magnetometer 21 in the first Gauss position and the second magnetometer 23 in the second Gauss position. It is also preferable, when the device is suitable for use on Earth where a North-South magnetic field prevails, to place the measurement axis of the first magnetometer 21 at an angle ⁇ of about 25 ° relative to the horizontal of the measurement location, and the measurement axis of the second magnetometer 23 along the vertical of this location, FIG. 2.
  • the second magnetometer 23 is capable of delivering at its output 24 a second signal representative of the value of the magnetic field measured at in the vicinity of the measurement point 10, the combination of the two first and second signals then constituting the measurement signal.
  • the means 8 to measure the magnetic field prevailing at the point of measurement 10 further comprises means 25 for controlling the ambient magnetic field, for example the terrestrial magnetic field prevailing around at least the first magnetometer 21, and advantageously also around the second when it is present.
  • These means 25 for controlling the ambient magnetic field can be constituted, for example, by a combination of several coils as illustrated in FIGS. 1 and 2.
  • These coils of the Helmholtz type are in this case four in number, combined in two sets of two coils nested one inside the other as illustrated, a game having its axis horizontal (North coil and South coil) and the other having its vertical axis (upper coil and lower coil).
  • the device includes means 26 for measuring the variations of the ambient magnetic field in the space in which the orientation of the cores is determined.
  • These latter means 26 are for example constituted by a conventional type magnetometer and are capable of delivering at their output 27 a third signal representative of the variations of the ambient magnetic field, the combination of the three first, second and third signals constituting in this case the signal of measurement.
  • This third signal is, in known manner, used to carry out a feedback with the two first and second signals defined above, with the aim of eliminating as much as possible the parasitic signal generated by the variations of the ambient magnetic field which can be due to many factors well known to those skilled in the art.
  • the device can also comprise means 30 for carrying out, in successive stages, partial demagnetization of the core 1 for the magnetizations subsequent to its original magnetization, this partial demagnetization having to be carried out before determining the carrot orientation.
  • These means 30 for partially demagnetizing a core before determining its orientation include means 31 for producing a magnetically isolated space 32, this space being defined around a second portion 33 of the bench 2 different from the first portion 5, and coils 34 able to create a magnetic demagnetization field of a controlled value arranged in this magnetically isolated space 32.
  • the means 31 are for example made up of a plurality of coaxial tunnels mounted one inside the other and made of a magnetic material such as steel or the like and the two coils 34 are supplied with direct electric current undergoing periodic inversions.
  • the device further comprises means 40 for angularly indexing the core 1 relative to the bench 2.
  • These means 40 comprise at least one mark 41 located on the cylindrical side wall 9 of the core, for example a light and / or reflective strip or similar, and means 42 for determining the position of this reference 41 with respect to the bench 2 when the core 1 is positioned on the cradle 3.
  • These means 42 include means for driving the core 1 in rotation about its axis of revolution 12 when the cradle 3 is located in a third portion 43 of the bench, a cell 44 for detecting the mark 41 and means 45 for fixing the cell 44 in a predetermined position relative to the bench 2 so that the reference 41 passes opposite the cell when the core 1 is driven in a rotational movement.
  • the bench 2 has the shape of a rail and the cradle 3 that of a carriage.
  • the means 4 for associating the cradle 3 with the bench 2 include means 50 for mounting the carriage in translation on the rail and means 51 for controlling the translation of the carriage along the rail so that this carriage can be locate on the rail in at least three different positions, in this case the first 5, second 33 and third 43 positions defined above.
  • the means 51 for controlling the translation of the carriage along the rail consist of a first motor 52 and an endless chain 53.
  • the endless chain 53 is mounted along the rail and coupled to the first motor via gear means and at at least one point 54 of the carriage so that the controlled rotation of the motor 52 causes, in a manner known per se, via the endless chain 53, the displacement of the carriage along the rail, in a one way or the other.
  • the means 7 for driving the carrot in rotation substantially about its axis of revolution 12 when it is disposed on the cradle 3 are constituted by at least two rollers 61, 62 of cylindrical shape of revolution mounted in rotation by relative to the cradle 3, the axes of revolution of these two rollers being parallel to the direction of translation of the cradle 3 along the bench 2, the distance separating their two axes of revolution being at most equal to the sum of the radii of the two rollers and the diameter of the core 1 to be oriented, and means 63 for controlling the rotation of the two rollers in the same direction, the core then being simply placed between the two rollers, the friction forces between the lateral surface of the core and the surfaces side of the rollers, generated by the rotation of the rollers, allowing the carrot to be driven in the same rotational movement, Figure 4.
  • the means 63 for controlling the rotation of the two rollers 61, 62 in the same direction consist of a second motor 64, a transmission shaft 65 coupled to this second motor and mounted parallel to the direction of translation of the cradle 3 along the bench 2, and means 66 for coupling the transmission shaft 65 with the two rollers so that the rotation of this transmission shaft causes the rotation of the two rollers in the same direction, FIG. 4.
  • the transmission shaft 65 has a polygonal section, in this case square, and it is slidably mounted in a complementary orifice 69 produced along the longitudinal axis of the roller 62. From this so, when the transmission shaft 65 is rotated by the second motor 64, it drives in its rotation the roller 62 and the roller 61 via the belt 67 by means of gears 68, for example.
  • the transmission shaft 65 does not prevent the carriage from moving along the rail, since it is slidably mounted in the orifice 69 produced in the roller 62. In this way, the cradle 3 can travel the entire length of the bench 2 and take on this bench, the three positions 5, 33 and 43 defined above and the rollers can be driven in rotation whatever the position of the cradle 3 on the bench 2.
  • the two motors 52 and 64 are arranged at the end 70 of the bench 2 furthest from the first portion 5 and are separated from these three portions 5, 33 and 43 by a magnetic screen 71, for example a plate made of a magnetic material.
  • the bench 2, the cradle 3, the means 4 for associating the cradle 3 with the bench and the means 7 for driving the carrot in rotation substantially about its axis of revolution 12, with the exception of the motors, are made of non-magnetic materials.
  • the means 11 for processing the measurement signal they are constituted by a computer or the like programmed to process the signals defined above and to give the result as explained below, the programming of such a computer presenting no difficulties. for a person skilled in the art knowing the structure of the device described above and its operation described below.
  • the two magnetometers 21 and 23 are arranged as mentioned before.
  • a reference 41 is placed thereon, for example a reflective strip, along a generator of its cylindrical wall of revolution 9.
  • the core is placed between the two rollers 61, 62 and the cradle 3 is brought to the third portion 43 of the bench 2.
  • the core is rotated around its axis of revolution 12 and, each time that the reference 41 passes opposite cell 44, the latter emits a signal 80.
  • the distance separating two consecutive signals 81, 82 represents a complete rotation of the core around its longitudinal axis, c that is to say an angular rotation of 360 °.
  • the cradle 3 carrying the carrot 1 can be brought directly to the level of the first portion 5 of the bench 2, opposite the two magnetometers 21, 23.
  • the carrot is then animated with a movement of rotation and, if it has only its remanent magnetization, the two signals delivered by the two magnetometers and conjugated in differential in the computer 1 1 give a signal of ideal sinusoidal shape, or approaching, for example as represented on the curve B , Figure 5.
  • the shape of the curve B and that of the curve A it is possible to define the position of the remanent magnetization vector V relative to the reference 41. In the case illustrated by the two curves A and B, this vector is located (FIGS. 5 and 6) either 135 ° or 315 ° from reference 41.
  • a controlled demagnetization of the carrot is carried out, followed by the orientation step as described above.
  • a plurality of successive partial demagnetizations can be carried out, followed by an orientation step.
  • the third signal emitted by the magnetometer 26 can be combined in feedback with the two first and second signals in the computer 11 to eliminate the influence of variations in the ambient magnetic field on the result of the orientation of the core 1 because the remanent magnetization of such a core is relatively weak and must in no way be parasitized.
  • the device described above makes it possible to define the orientation of the core using its transverse remanent magnetization V i. But still it is necessary to determine the top and the bottom of the carrot when it was in the ground before its sampling because, by neglecting the determination of this parameter, it is possible to make an error of up to one hundred and eighty degrees in determining the orientation of this core
  • Terrestrial rocks have a remanent magnetization which can be broken down into two vectors, the transverse remanent magnetization vector V, which was defined previously and a longitudinal remanent magnetization vector V / along the axis of revolution 12 of the core 1, figure 6
  • This embodiment of the device comprises, in addition to the means of the embodiment described above with reference to FIGS. 1 to 4, means 91 for measuring the longitudinal magnetization of the core 1
  • these means 91 comprise a chute 92 defining a housing 93 for receiving the carrot, this housing having a longitudinal axis 94, the axis of revolution 12 of the carrot being parallel to this longitudinal axis 94 when it is located in the housing
  • These means 91 further comprise means 95 for positioning the chute relative to the bench 2 so that the longitudinal axis 94 of the housing 93 is substantially perpendicular to the axis of revolution 12 of the carrot when the latter is driven in rotation relative to the cradle 3 when the cradle is located on the first portion 5 of the bench 2 as defined above
  • these means 95 comprise means 96 for mounting the rotating chute 92 relative to the bench 2 around substantially the measurement point 10 so as to be able to orient the longitudinal axis 94 of the housing 93 parallel to the Earth's magnetic field where the measurement is made, after orienting the bank 2 advantageously following the East-West direction as explained above
  • the device described above with reference to FIG. 7 makes it possible to determine, if it turns out to be necessary, the top and the bottom of the carrot, that is to say its original direction on the vertical of the er where it has been extracted, used and operated as follows
  • this first value corresponds substantially to the value of the magnetization due to the terrestrial magnetic field at the measuring point 10 to which is added or subtracted the value of the longitudinal remanent magnetization of the core 1
  • the core 1 is then returned to the housing 93 so as to interchange the location of its two ends is carried out a second measurement with the sensors 21 and 23 which deliver a further signal representing a second value of the magnetization along the axis carrot re ⁇ olut ⁇ on 12
  • the longitudinal remanent magnetization of the core has the same direction as the earth's magnetic field at the measuring point 10 if the first value is infé ⁇ eure per second, the longitudinal remanent magnetization of the core is in opposite directions has the Earth's magnetic field

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Abstract

The invention concerns devices for directing cylindrical cores (1) rotating about an axis of revolution (12) said cores having been sampled from a rocky environment or the like which has been subjected, during its formation, to an earth's magnetic field and which consequently has a remanent magnetisation. The inventive device is essentially characterised in that it comprises a bed (2), a cradle (3) and means for associating the cradle (3) with the bed, means for driving the core (1) in rotation substantially about its axis or revolution (12) relative to the cradle when the latter is located in a first portion (5) of the bed (2) and such that its side wall (9) passes substantially through a measuring point (10), means for measuring the magnetic field prevailing at the measuring point, said measuring means being capable of delivering a measuring signal, and means (11) for processing the measuring signal. The invention is particularly useful for directing cores derived from oilfields.

Description

Dispositif permettant d'orienter des carottes de forage Device for orienting drill cores
La présente invention concerne les dispositifs permettant d'orienter des carottes de forage qui ont des formes cylindriques de révolution autour d'un axe de révolution, lorsque ces carottes ont été prélevées dans des milieux rocheux ou analogues qui ont été soumis, lors de leur formation, à un champ magnétique terrestre et qui ont de ce fait une aimantation rémanente, et plus particulièrement les dispositifs qui permettent d'orienter des carottes prélevées dans des roches pétrolifères. II est connu que, notamment dans le cadre de recherches pétrolières, il est nécessaire d'analyser le sous-sol terrestre. Dans ce but, on réalise des puits ou forages et on prélève, dans le sous-sol à analyser, des morceaux de roches dénommés "carottes" au moyen d'outils spéciaux connus sous le nom de "carotteuses".The present invention relates to devices making it possible to orient drill cores which have cylindrical shapes of revolution around an axis of revolution, when these cores have been taken from rocky or similar environments which have been subjected, during their formation , to a terrestrial magnetic field and which therefore have a remanent magnetization, and more particularly the devices which make it possible to orient cores taken from petroleum rocks. It is known that, in particular in the context of petroleum research, it is necessary to analyze the earth's subsoil. For this purpose, wells or boreholes are made and samples of rock called "carrots" are removed from the subsoil to be analyzed using special tools known as "core drills".
Par l'analyse de ces carottes, il est possible de connaître la composition du sous-sol. Cependant, dans certains cas, notamment dans le cas d'une exploitation pétrolière, il est aussi nécessaire de connaître leur orientation exacte lorsqu'elles étaient dans le sol avant leur extraction.By analyzing these carrots, it is possible to know the composition of the subsoil. However, in certain cases, in particular in the case of an oil exploitation, it is also necessary to know their exact orientation when they were in the ground before their extraction.
Or, de telles carottes sont découpées dans le sous-sol à l'aide de carotteuses qui sont des outils animés de mouvements de rotation et il n'est donc pas possible, à leur sortie, de connaître leur orientation originelle. Il faut dont procéder à ce que les techniciens dénomment leur «orientation».However, such carrots are cut in the basement using corers which are tools animated by rotational movements and it is therefore not possible, at their exit, to know their original orientation. It is therefore necessary to proceed with what the technicians call their "orientation".
Ceci ayant été précisé, il est tout d'abord nécessaire de rappeler que, sur la Terre, règne un champ magnétique orienté vers un point dénommé "Nord" qui a actuellement une position bien déterminée par rapport au globe terrestre. Mais il faut aussi savoir qu'au cours des ères géologiques passées, la position du Nord magnétique n'a pas toujours été la même par rapport aux continents puisque ceux-ci ont dérivé à la surface du globe terrestre. Il est même connu que le sens du champ magnétique s'est inversé un grand nombre de fois. Tous ces changements sont bien connus et parfaitement répertoriés. On sait aussi que les roches terrestres possèdent une aimantation qui comprend deux composantes, l'une représentant l'aimantation induite par le champ magnétique actuel, que les techniciens dénomment "aimantation induite", l'autre représentant l'aimantation dite "aimantation rémanente" correspondant à l'aimantation induite par le champ magnétique terrestre qui régnait au moment de la formation de ces roches et dont elles ont mémorisé la direction et le sens. Connaissant, d'une part le sens et la direction de cette aimantation rémanente dans une carotte, et d'autre part l'époque de la formation de la couche rocheuse de laquelle a été extraite cette carotte et la position de cette couche rocheuse dans le sol, il est possible de déterminer l'orientation de la carotte par rapport à cette roche et donc par rapport au globe terrestre.This having been specified, it is first of all necessary to recall that, on the Earth, reigns a magnetic field directed towards a point called "North" which currently has a well determined position compared to the terrestrial globe. But you should also know that during past geological eras, the position of the magnetic North has not always been the same compared to the continents since they have drifted on the surface of the terrestrial globe. It is even known that the direction of the magnetic field has been reversed many times. All of these changes are well known and fully documented. We also know that terrestrial rocks have a magnetization which includes two components, one representing the magnetization induced by the current magnetic field, that the technicians call "induced magnetization", the other representing the magnetization called "remanent magnetization" corresponding to the magnetization induced by the terrestrial magnetic field which reigned at the time of the formation of these rocks and of which they memorized the direction and the direction. Knowing, on the one hand the meaning and the direction of this remanent magnetization in a carrot, and on the other hand the time of the formation of the rock layer from which this carrot was extracted and the position of this rock layer in the soil, it is possible to determine the orientation of the carrot in relation to this rock and therefore in relation to the terrestrial globe.
Des dispositifs permettant d'orienter des carottes prélevées dans des milieux rocheux à partir de leur aimantation rémanente sont déjà connus mais, de par leur structure, ils ne peuvent être utilisés qu'en laboratoire. Ils ne permettent pas d'effectuer des mesures sur le terrain et ne sont pas adaptés pour déterminer l'orientation de grandes quantités de carottes. La présente invention a ainsi pour but de réaliser un dispositif permettant d'orienter des carottes de forme cylindrique de révolution autour d'un axe de révolution, lorsque ces carottes ont été prélevées dans un milieu rocheux ou analogue et lorsque ce milieu a été soumis lors de sa formation à un champ magnétique terrestre et qu'il comprend de ce fait une aimantation rémanente, et plus particulièrement un dispositif qui permette d'orienter des carottes prélevées dans des roches pétrolifères, qui obvie aux inconvénients des dispositifs similaires de laboratoire actuellement connus, notamment en permettant d'effectuer in situ et de façon presque totalement automatique des mesures d'orientation en série sur de grandes quantités de carottes, même de relativement grande longueur.Devices for orienting cores taken from rocky environments from their remanent magnetization are already known but, by their structure, they can only be used in the laboratory. They do not allow measurements to be made in the field and are not suitable for determining the orientation of large quantities of carrots. The present invention thus aims to provide a device for orienting cores of cylindrical shape of revolution about an axis of revolution, when these cores were taken from a rocky environment or the like and when this environment was subjected during of its formation in a terrestrial magnetic field and that it therefore comprises a remanent magnetization, and more particularly a device which makes it possible to orient cores taken from petroleum rocks, which obviates the drawbacks of similar laboratory devices currently known, in particular by making it possible to carry out, in situ and almost completely automatically, orientation measurements in series on large quantities of carrots, even of relatively great length.
Plus précisément la présente invention a pour objet un dispositif permettant d'orienter des carottes de forme cylindrique de révolution autour d'un axe de révolution, ces carottes ayant été prélevées dans un milieu rocheux ou analogue qui a été soumis, lors de sa formation, à un champ magnétique terrestre et qui a de ce fait une aimantation rémanente, caractérisé par le fait qu'il comporte :More precisely, the subject of the present invention is a device making it possible to orient cores of cylindrical shape of revolution around an axis of revolution, these cores having been taken from a rocky or similar medium which was subjected, during its formation, to a terrestrial magnetic field and which therefore has a remanent magnetization, characterized in that it comprises:
- un banc, - un berceau,- a bench, - a cradle,
- des moyens pour associer le berceau avec le banc,- means for associating the cradle with the bench,
- des moyens pour entraîner la carotte en rotation sensiblement autour de son axe de révolution par rapport au berceau lorsque ledit berceau est situé sur une première portion du banc, de façon que la paroi latérale de ladite carotte passe sensiblement par un point dit "point de mesure",- Means for driving the carrot in rotation substantially about its axis of revolution relative to the cradle when said cradle is located on a first portion of the bench, so that the side wall of said carrot passes substantially through a point called "point of measured",
- des moyens pour mesurer le champ magnétique régnant audit point de mesure, ces moyens de mesure étant aptes à délivrer un signal dit "signal de mesure", etmeans for measuring the magnetic field prevailing at said measurement point, these measurement means being capable of delivering a signal called "measurement signal", and
- des moyens pour traiter le signal de mesure. D'autres caractéristiques et avantages de l'invention apparaîtront au cours de la description suivante donnée en regard des dessins annexés à titre illustratif mais nullement limitatif, dans lesquels :- means for processing the measurement signal. Other characteristics and advantages of the invention will appear during the following description given with reference to the drawings annexed by way of illustration but in no way limitative, in which:
La figure 1 représente le schéma de principe d'un mode de réalisation du dispositif selon l'invention dans sa configuration la plus complète,FIG. 1 represents the block diagram of an embodiment of the device according to the invention in its most complete configuration,
Les figures 2, 3 et 4 représentent respectivement un mode de réalisation de trois détails de la structure du dispositif tel qu'illustré schématiquement sur la figure 1,FIGS. 2, 3 and 4 respectively represent an embodiment of three details of the structure of the device as illustrated diagrammatically in FIG. 1,
La figure 5 représente deux diagrammes permettant d'expliciter le fonctionnement du dispositif et les résultats pouvant être obtenus, La figure 6 représente une carotte telle qu'elle peut être extraite du sol par une carotteuse, etFIG. 5 represents two diagrams making it possible to explain the operation of the device and the results that can be obtained, FIG. 6 represents a core such that it can be extracted from the ground by a core drilling machine, and
La figure 7 représente le schéma de principe d'un perfectionnement au mode de réalisation du dispositif selon les figures 1 à 4.FIG. 7 represents the block diagram of an improvement to the embodiment of the device according to FIGS. 1 to 4.
Les figures 1 à 4 et 7 représentent deux modes de réalisation du dispositif selon l'invention. Cependant, les mêmes références y désignent les mêmes éléments quelle que soit la figure sur laquelle elles apparaissent et quelle que soit la forme de représentation de ces éléments.Figures 1 to 4 and 7 show two embodiments of the device according to the invention. However, the same references designate the same elements there regardless of the figure on which they appear and whatever the form of representation of these elements.
La figure 1 représente le schéma de principe du dispositif selon l'invention dans sa configuration la plus complète. Le dispositif selon l'invention permet d'orienter des carottes 1 qui sont de forme cylindrique de révolution autour d'un axe de révolution 12, ces carottes ayant été prélevées dans un milieu rocheux ou analogue qui a été soumis, lors de sa formation, à un champ magnétique terrestre et qui a de ce fait une aimantation transversale rémanente, figure 6, c'est-à-dire une aimantation qui peut être représentée par un vecteur "V," perpendiculaire à l'axe de révolution 12 de la carotte.Figure 1 shows the block diagram of the device according to the invention in its most complete configuration. The device according to the invention makes it possible to orient cores 1 which are of cylindrical shape of revolution around an axis of revolution 12, these cores having been taken from a rocky environment or the like which was subjected, during its formation, to a terrestrial magnetic field and which therefore has a residual transverse magnetization, FIG. 6, that is to say a magnetization which can be represented by a vector "V," perpendicular to the axis of revolution 12 of the carrot .
Par référence plus particulièrement à la figure 1 , le dispositif comporte un banc 2 de forme oblongue, un berceau 3, des moyens 4 pour associer le berceau 3 avec le banc, des moyens 7 pour entraîner la carotte 1 en rotation sensiblement autour de son axe de révolution 12 par rapport au berceau lorsque le berceau est situé sur une première portion 5 du banc 2, de façon que la paroi latérale 9 de la carotte passe sensiblement par un point 10 dit "point de mesure", des moyens 8 pour mesurer le champ magnétique régnant en ce point de mesure 10, ces moyens de mesure étant aptes à délivrer un signal dit "signal de mesure", et des moyens 1 1 pour traiter ce signal de mesure. Dans une première réalisation possible, les moyens 8 pour mesurer le champ magnétique régnant au point de mesure 10 sont constitués par au moins un premier magnetomètre 21 apte à délivrer en sortie 22 un premier signal représentatif de la valeur du champ magnétique mesuré en ce point de mesure, ce premier signal constituant le signal de mesure. Le Demandeur a notamment obtenu de très bons résultats avec le magnetomètre commercialisé par la Société Scintrex sous la référence SMG4.With particular reference to FIG. 1, the device comprises a bench 2 of oblong shape, a cradle 3, means 4 for associating the cradle 3 with the bench, means 7 for driving the core 1 in rotation substantially around its axis of revolution 12 relative to the cradle when the cradle is located on a first portion 5 of the bench 2, so that the side wall 9 of the core passes substantially through a point 10 called "measuring point", means 8 for measuring the magnetic field prevailing at this measurement point 10, these measurement means being capable of delivering a signal called "measurement signal", and means 11 to process this measurement signal. In a first possible embodiment, the means 8 for measuring the magnetic field prevailing at the measurement point 10 are constituted by at least a first magnetometer 21 capable of delivering at output 22 a first signal representative of the value of the magnetic field measured at this point of measurement, this first signal constituting the measurement signal. The Applicant has in particular obtained very good results with the magnetometer marketed by the Scintrex Company under the reference SMG4.
Cependant, dans le but d'éliminer le plus possible de signaux parasites, il peut être préférable d'effectuer des mesures en différentielle. Les moyens 8 pour mesurer le champ magnétique régnant au point de mesure 10 comportent alors en outre un second magnetomètre 23 associé au premier, figure 2, de façon qu'il soit apte à mesurer le champ magnétique régnant, non pas au point de mesure 10, mais au voisinage de ce point de mesure, c'est-à-dire en un endroit relativement proche, pour éviter qu'il y ait interférence entre ces deux magnétomètres.However, in order to eliminate as many spurious signals as possible, it may be preferable to carry out differential measurements. The means 8 for measuring the magnetic field prevailing at the measurement point 10 then further comprise a second magnetometer 23 associated with the first, FIG. 2, so that it is capable of measuring the prevailing magnetic field, not at the measurement point 10 , but in the vicinity of this measurement point, that is to say in a relatively close location, to avoid interference between these two magnetometers.
De plus, il y a avantage à placer le premier magnetomètre 21 en première position de Gauss et le second magnetomètre 23 en seconde position de Gauss. Il est aussi préférable, quand le dispositif est apte à être utilisé sur la Terre où règne un champ magnétique Nord- Sud, de placer l'axe de mesure du premier magnetomètre 21 suivant un angle α d'environ 25° par rapport à l'horizontale du lieu de mesure, et l'axe de mesure du second magnetomètre 23 suivant la verticale de ce lieu, figure 2. Le second magnetomètre 23 est apte à délivrer à sa sortie 24 un deuxième signal représentatif de la valeur du champ magnétique mesuré au voisinage du point de mesure 10, la combinaison des deux premier et deuxième signaux constituant alors le signal de mesure.In addition, it is advantageous to place the first magnetometer 21 in the first Gauss position and the second magnetometer 23 in the second Gauss position. It is also preferable, when the device is suitable for use on Earth where a North-South magnetic field prevails, to place the measurement axis of the first magnetometer 21 at an angle α of about 25 ° relative to the horizontal of the measurement location, and the measurement axis of the second magnetometer 23 along the vertical of this location, FIG. 2. The second magnetometer 23 is capable of delivering at its output 24 a second signal representative of the value of the magnetic field measured at in the vicinity of the measurement point 10, the combination of the two first and second signals then constituting the measurement signal.
En outre, comme les magnétomètres définis ci-avant doivent être disposés dans un champ magnétique de préférence uniforme pour pouvoir fonctionner, par exemple le champ magnétique terrestre Nord-Sud, il est avantageux que les moyens 8 pour mesurer le champ magnétique régnant au point de mesure 10 comportent en outre des moyens 25 pour contrôler le champ magnétique ambiant, par exemple le champ magnétique terrestre régnant autour au moins du premier magnetomètre 21, et avantageusement autour également du second quand il est présent. Ces moyens 25 pour contrôler le champ magnétique ambiant peuvent être constitués, par exemple, par une combinaison de plusieurs bobines comme illustré sur les figures 1 et 2. Ces bobines du type Helmholtz sont dans ce cas au nombre de quatre, combinées en deux jeux de deux bobines imbriqués les uns dans les autres comme illustré, un jeu ayant son axe horizontal (bobine Nord et bobine Sud) et l'autre ayant son axe vertical (bobine supérieure et bobine inférieure).In addition, as the magnetometers defined above must be placed in a preferably uniform magnetic field in order to function, for example the North-South terrestrial magnetic field, it is advantageous for the means 8 to measure the magnetic field prevailing at the point of measurement 10 further comprises means 25 for controlling the ambient magnetic field, for example the terrestrial magnetic field prevailing around at least the first magnetometer 21, and advantageously also around the second when it is present. These means 25 for controlling the ambient magnetic field can be constituted, for example, by a combination of several coils as illustrated in FIGS. 1 and 2. These coils of the Helmholtz type are in this case four in number, combined in two sets of two coils nested one inside the other as illustrated, a game having its axis horizontal (North coil and South coil) and the other having its vertical axis (upper coil and lower coil).
Il est en outre avantageux que le dispositif comporte des moyens 26 pour mesurer les variations du champ magnétique ambiant dans l'espace dans lequel est effectuée la détermination de l'orientation des carottes. Ces derniers moyens 26 sont par exemple constitués par un magnetomètre de type classique et sont aptes à délivrer à leur sortie 27 un troisième signal représentatif des variations du champ magnétique ambiant, la combinaison des trois premier, deuxième et troisième signaux constituant dans ce cas le signal de mesure.It is also advantageous for the device to include means 26 for measuring the variations of the ambient magnetic field in the space in which the orientation of the cores is determined. These latter means 26 are for example constituted by a conventional type magnetometer and are capable of delivering at their output 27 a third signal representative of the variations of the ambient magnetic field, the combination of the three first, second and third signals constituting in this case the signal of measurement.
Ce troisième signal est, de façon connue, utilisé pour réaliser une contre-réaction avec les deux premier et deuxième signaux définis ci-avant, dans le but d'éliminer au maximum le signal parasite engendré par les variations du champ magnétique ambiant qui peuvent être dues à de nombreux facteurs bien connus des hommes du métier.This third signal is, in known manner, used to carry out a feedback with the two first and second signals defined above, with the aim of eliminating as much as possible the parasitic signal generated by the variations of the ambient magnetic field which can be due to many factors well known to those skilled in the art.
Il est aussi bien évident que les carottes 1 à orienter ont pu être soumises à des aimantations successives au cours du temps après leur première aimantation lors de la formation des roches dans lesquelles elles ont été prélevées.It is also quite obvious that the cores 1 to be oriented could have been subjected to successive magnetizations over time after their first magnetization during the formation of the rocks from which they were taken.
En conséquence, de façon avantageuse, le dispositif peut comporter en outre des moyens 30 pour effectuer, par étapes successives, une désaimantation partielle de la carotte 1 pour les aimantations postérieures à son aimantation originelle, cette désaimantation partielle devant être effectuée avant de déterminer l'orientation de la carotte. Ces moyens 30 pour désaimanter partiellement une carotte avant de déterminer son orientation comportent des moyens 31 pour réaliser un espace isolé magnétiquement 32, cet espace étant défini autour d'une deuxième portion 33 du banc 2 différente de la première portion 5, et des bobines 34 aptes à créer un champ magnétique de désaimantation d'une valeur contrôlée disposées dans cet espace isolé magnétiquement 32. Les moyens 31 sont par exemple constitués d'une pluralité de tunnels coaxiaux montés les uns dans les autres et réalisés en un matériau magnétique comme de l'acier ou analogue et les deux bobines 34 sont alimentées en courant électrique continu subissant des inversions périodiques.Consequently, advantageously, the device can also comprise means 30 for carrying out, in successive stages, partial demagnetization of the core 1 for the magnetizations subsequent to its original magnetization, this partial demagnetization having to be carried out before determining the carrot orientation. These means 30 for partially demagnetizing a core before determining its orientation include means 31 for producing a magnetically isolated space 32, this space being defined around a second portion 33 of the bench 2 different from the first portion 5, and coils 34 able to create a magnetic demagnetization field of a controlled value arranged in this magnetically isolated space 32. The means 31 are for example made up of a plurality of coaxial tunnels mounted one inside the other and made of a magnetic material such as steel or the like and the two coils 34 are supplied with direct electric current undergoing periodic inversions.
Le dispositif comporte en outre des moyens 40 pour indexer angulairement la carotte 1 par rapport au banc 2. Ces moyens 40 comportent au moins un repère 41 situé sur la paroi latérale cylindrique 9 de la carotte, par exemple une bande lumineuse et/ou réfléchissante ou analogue, et des moyens 42 pour déterminer la position de ce repère 41 par rapport au banc 2 quand la carotte 1 est positionnée sur le berceau 3. Ces moyens 42 comportent des moyens pour entraîner la carotte 1 en rotation autour de son axe de révolution 12 lorsque le berceau 3 est situé en une troisième portion 43 du banc, une cellule 44 de détection du repère 41 et des moyens 45 pour fixer la cellule 44 dans une position prédéterminée par rapport au banc 2 de façon que le repère 41 passe en regard de la cellule quand la carotte 1 est animée d'un mouvement de rotation.The device further comprises means 40 for angularly indexing the core 1 relative to the bench 2. These means 40 comprise at least one mark 41 located on the cylindrical side wall 9 of the core, for example a light and / or reflective strip or similar, and means 42 for determining the position of this reference 41 with respect to the bench 2 when the core 1 is positioned on the cradle 3. These means 42 include means for driving the core 1 in rotation about its axis of revolution 12 when the cradle 3 is located in a third portion 43 of the bench, a cell 44 for detecting the mark 41 and means 45 for fixing the cell 44 in a predetermined position relative to the bench 2 so that the reference 41 passes opposite the cell when the core 1 is driven in a rotational movement.
Dans une réalisation avantageuse, le banc 2 a la forme d'un rail et le berceau 3 celle d'un chariot. Dans ce cas, les moyens 4 pour associer le berceau 3 avec le banc 2 comportent des moyens 50 pour monter le chariot en translation sur le rail et des moyens 51 pour commander la translation du chariot le long du rail de façon que ce chariot puisse se situer sur le rail en au moins trois positions différentes, en l'occurrence les première 5, deuxième 33 et troisième 43 positions définies ci-avant.In an advantageous embodiment, the bench 2 has the shape of a rail and the cradle 3 that of a carriage. In this case, the means 4 for associating the cradle 3 with the bench 2 include means 50 for mounting the carriage in translation on the rail and means 51 for controlling the translation of the carriage along the rail so that this carriage can be locate on the rail in at least three different positions, in this case the first 5, second 33 and third 43 positions defined above.
Dans une réalisation possible, les moyens 51 pour commander la translation du chariot le long du rail sont constitués par un premier moteur 52 et une chaîne sans fin 53. La chaîne sans fin 53 est montée le long du rail et couplée au premier moteur via des moyens d'engrenage et en au moins un point 54 du chariot de façon que la rotation commandée du moteur 52 entraîne, de façon connue en elle-même, via la chaîne sans fin 53, le déplacement du chariot le long du rail, dans un sens ou dans l'autre.In one possible embodiment, the means 51 for controlling the translation of the carriage along the rail consist of a first motor 52 and an endless chain 53. The endless chain 53 is mounted along the rail and coupled to the first motor via gear means and at at least one point 54 of the carriage so that the controlled rotation of the motor 52 causes, in a manner known per se, via the endless chain 53, the displacement of the carriage along the rail, in a one way or the other.
Dans une réalisation possible, les moyens 7 pour entraîner la carotte en rotation sensiblement autour de son axe de révolution 12 lorsqu'elle est disposée sur le berceau 3 sont constitués par au moins deux rouleaux 61, 62 de forme cylindrique de révolution montés en rotation par rapport au berceau 3, les axes de révolution de ces deux rouleaux étant parallèles à la direction de translation du berceau 3 le long du banc 2, la distance séparant leurs deux axes de révolution étant au plus égale à la somme des rayons des deux rouleaux et du diamètre de la carotte 1 à orienter, et des moyens 63 pour commander la rotation des deux rouleaux dans le même sens, la carotte étant alors simplement posée entre les deux rouleaux, les forces de friction entre la surface latérale de la carotte et les surfaces latérales des rouleaux, engendrées par la rotation des rouleaux, permettant d'entraîner la carotte dans le même mouvement de rotation, figure 4.In one possible embodiment, the means 7 for driving the carrot in rotation substantially about its axis of revolution 12 when it is disposed on the cradle 3 are constituted by at least two rollers 61, 62 of cylindrical shape of revolution mounted in rotation by relative to the cradle 3, the axes of revolution of these two rollers being parallel to the direction of translation of the cradle 3 along the bench 2, the distance separating their two axes of revolution being at most equal to the sum of the radii of the two rollers and the diameter of the core 1 to be oriented, and means 63 for controlling the rotation of the two rollers in the same direction, the core then being simply placed between the two rollers, the friction forces between the lateral surface of the core and the surfaces side of the rollers, generated by the rotation of the rollers, allowing the carrot to be driven in the same rotational movement, Figure 4.
Les moyens 63 pour commander la rotation des deux rouleaux 61, 62 dans le même sens sont constitués par un second moteur 64, un arbre de transmission 65 couplé à ce second moteur et monté parallèle à la direction de translation du berceau 3 le long du banc 2, et des moyens 66 pour coupler l'arbre de transmission 65 avec les deux rouleaux de façon que la rotation de cet arbre de transmission entraîne la rotation des deux rouleaux dans le même sens, figure 4. Dans ce but, comme représenté sur la figure 4, l'arbre de transmission 65 présente une section polygonale, en l'occurrence carrée, et il est monté coulissant dans un orifice complémentaire 69 réalisé suivant l'axe longitudinal du rouleau 62. De cette façon, quand l'arbre de transmission 65 est entraîné en rotation par le second moteur 64, il entraîne dans sa rotation le rouleau 62 et le rouleau 61 via la courroie 67 au moyen par exemple des engrenages 68.The means 63 for controlling the rotation of the two rollers 61, 62 in the same direction consist of a second motor 64, a transmission shaft 65 coupled to this second motor and mounted parallel to the direction of translation of the cradle 3 along the bench 2, and means 66 for coupling the transmission shaft 65 with the two rollers so that the rotation of this transmission shaft causes the rotation of the two rollers in the same direction, FIG. 4. For this purpose, as shown in FIG. 4, the transmission shaft 65 has a polygonal section, in this case square, and it is slidably mounted in a complementary orifice 69 produced along the longitudinal axis of the roller 62. From this so, when the transmission shaft 65 is rotated by the second motor 64, it drives in its rotation the roller 62 and the roller 61 via the belt 67 by means of gears 68, for example.
En revanche, il faut noter que l'arbre de transmission 65 n'empêche pas le chariot de se déplacer le long du rail, puisqu'il est monté coulissant dans l'orifice 69 réalisé dans le rouleau 62. De cette façon, le berceau 3 peut parcourir toute la longueur du banc 2 et prendre sur ce banc, les trois positions 5, 33 et 43 définies ci-avant et les rouleaux peuvent être entraînés en rotation quelle que soit la position du berceau 3 sur le banc 2.On the other hand, it should be noted that the transmission shaft 65 does not prevent the carriage from moving along the rail, since it is slidably mounted in the orifice 69 produced in the roller 62. In this way, the cradle 3 can travel the entire length of the bench 2 and take on this bench, the three positions 5, 33 and 43 defined above and the rollers can be driven in rotation whatever the position of the cradle 3 on the bench 2.
Dans une réalisation avantageuse, comme il est impossible de réaliser des moteurs avec uniquement des matériaux amagnétiques, les deux moteurs 52 et 64 sont disposés à l'extrémité 70 du banc 2 la plus éloignée de la première portion 5 et sont séparés de ces trois portions 5, 33 et 43 par un écran magnétique 71 par exemple une plaque en un matériau magnétique.In an advantageous embodiment, since it is impossible to produce motors with only non-magnetic materials, the two motors 52 and 64 are arranged at the end 70 of the bench 2 furthest from the first portion 5 and are separated from these three portions 5, 33 and 43 by a magnetic screen 71, for example a plate made of a magnetic material.
De même il est concevable que, pour éviter tout influence magnétique parasite, le banc 2, le berceau 3, les moyens 4 pour associer le berceau 3 avec le banc et les moyens 7 pour entraîner la carotte en rotation sensiblement autour de son axe de révolution 12, à l'exception des moteurs, sont réalisés dans des matériaux amagnétiques.Similarly, it is conceivable that, to avoid any parasitic magnetic influence, the bench 2, the cradle 3, the means 4 for associating the cradle 3 with the bench and the means 7 for driving the carrot in rotation substantially about its axis of revolution 12, with the exception of the motors, are made of non-magnetic materials.
Quant aux moyens 11 pour traiter le signal de mesure, ils sont constitués par un ordinateur ou analogue programmé pour traiter les signaux définis ci-dessus et donner le résultat comme explicité ci-dessous, la programmation d'un tel ordinateur ne présentant pas de difficultés pour un homme du métier connaissant la structure du dispositif décrite ci- dessus et son fonctionnement décrit ci-après.As for the means 11 for processing the measurement signal, they are constituted by a computer or the like programmed to process the signals defined above and to give the result as explained below, the programming of such a computer presenting no difficulties. for a person skilled in the art knowing the structure of the device described above and its operation described below.
Le dispositif décrit ci-dessus fonctionne et s'utilise de la façon suivante :The device described above works and is used in the following way:
On commence par orienter le banc de façon que son axe longitudinal, et donc la direction de déplacement du chariot le long du rail, soient parallèles à la direction magnétique Est-Ouest et de façon que les bobines Sud et Nord (figure 2) soient perpendiculaires au champ magnétique terrestre.We start by orienting the bench so that its longitudinal axis, and therefore the direction of movement of the carriage along the rail, are parallel to the magnetic direction East-West and so that the coils South and North (Figure 2) are perpendicular to the Earth's magnetic field.
Les deux magnétomètres 21 et 23 sont disposés comme mentionné auparavant.The two magnetometers 21 and 23 are arranged as mentioned before.
On effectue ensuite une indexation de la carotte, pour ce faire, on place sur celle-ci un repère 41, par exemple une bande réfléchissante, selon une génératrice de sa paroi cylindrique de révolution 9. La carotte est posée entre les deux rouleaux 61, 62 et le berceau 3 est amené sur la troisième portion 43 du banc 2. La carotte est animée d'un mouvement de rotation autour de son axe de révolution 12 et, chaque fois que le repère 41 passe en regard de la cellule 44, celle-ci émet un signal 80. Sur la représentation graphique A de la figure 5, la distance séparant deux signaux consécutifs 81, 82 représente une rotation complète de la carotte autour de son axe longitudinal, c'est-à-dire une rotation angulaire de 360°. Ces signaux sont mis en mémoire dans l'ordinateur 11 en attente de la suite des opérations pour l'orientation de la carotte.An carrot is then indexed, to do this, a reference 41 is placed thereon, for example a reflective strip, along a generator of its cylindrical wall of revolution 9. The core is placed between the two rollers 61, 62 and the cradle 3 is brought to the third portion 43 of the bench 2. The core is rotated around its axis of revolution 12 and, each time that the reference 41 passes opposite cell 44, the latter emits a signal 80. In the graphical representation A of FIG. 5, the distance separating two consecutive signals 81, 82 represents a complete rotation of the core around its longitudinal axis, c that is to say an angular rotation of 360 °. These signals are stored in the computer 11 awaiting the continuation of the operations for the orientation of the core.
Cette opération d'indexation de la carotte terminée, le berceau 3 portant la carotte 1 peut être directement amené au niveau de la première portion 5 du banc 2, en regard des deux magnétomètres 21, 23. La carotte est alors animée d'un mouvement de rotation et, si elle ne possède que son aimantation rémanente, les deux signaux délivrés par les deux magnétomètres et conjugués en différentielle dans l'ordinateur 1 1 donnent un signal de forme sinusoïdale idéale, ou approchante, par exemple comme représenté sur la courbe B, figure 5. En comparant, notamment dans l'ordinateur, la forme de la courbe B et celle de la courbe A, il est possible de définir la position du vecteur aimantation rémanente V par rapport au repère 41. Dans le cas illustré par les deux courbes A et B, ce vecteur est situé (figures 5 et 6) soit à 135° soit à 315° du repère 41.This indexing operation of the carrot completed, the cradle 3 carrying the carrot 1 can be brought directly to the level of the first portion 5 of the bench 2, opposite the two magnetometers 21, 23. The carrot is then animated with a movement of rotation and, if it has only its remanent magnetization, the two signals delivered by the two magnetometers and conjugated in differential in the computer 1 1 give a signal of ideal sinusoidal shape, or approaching, for example as represented on the curve B , Figure 5. By comparing, in particular in the computer, the shape of the curve B and that of the curve A, it is possible to define the position of the remanent magnetization vector V relative to the reference 41. In the case illustrated by the two curves A and B, this vector is located (FIGS. 5 and 6) either 135 ° or 315 ° from reference 41.
Cependant, il peut être décidé par l'opérateur de faire subir à la carotte une première désaimantation partielle avant d'effectuer l'opération d'orientation décrite ci-dessus. Pour cela, une fois l'opération d'indexation de la carotte étant terminée, le berceau 3 portant la carotte est amené au niveau de la deuxième portion 33 du banc 2, dans l'espace 32.However, it can be decided by the operator to subject the carrot to a first partial demagnetization before carrying out the orientation operation described above. To do this, once the carrot indexing operation has been completed, the cradle 3 carrying the carrot is brought to the level of the second portion 33 of the bench 2, in space 32.
Une désaimantation contrôlée de la carotte est effectuée, suivie de l'étape d'orientation comme décrit ci-avant. Selon le résultat obtenu, il peut être procédé à une pluralité de désaimantations partielles successives suivies d'une étape d'orientation.A controlled demagnetization of the carrot is carried out, followed by the orientation step as described above. Depending on the result obtained, a plurality of successive partial demagnetizations can be carried out, followed by an orientation step.
Bien entendu, lors de l'étape d'orientation, le troisième signal émis par le magnetomètre 26 peut être combiné en contre réaction avec les deux premier et deuxième signaux dans l'ordinateur 11 pour éliminer l'influence des variations du champ magnétique ambiant sur le résultat de l'orientation de la carotte 1 car l'aimantation rémanente d'une telle carotte est relativement faible et ne doit en aucune façon être parasitée.Of course, during the orientation step, the third signal emitted by the magnetometer 26 can be combined in feedback with the two first and second signals in the computer 11 to eliminate the influence of variations in the ambient magnetic field on the result of the orientation of the core 1 because the remanent magnetization of such a core is relatively weak and must in no way be parasitized.
Le dispositif décrit ci-dessus permet de définir l'orientation de la carotte en utilisant son aimantation rémanente transversale V,. Mais encore faut-il déterminer le haut et le bas de la carotte lorsqu'elle était dans le sol avant son prélèvement car, en négligeant la détermination de ce paramètre, il est possible de faire une erreur pouvant aller jusqu'à cent quatre-vingts degrés sur la détermination de l'orientation de cette carotteThe device described above makes it possible to define the orientation of the core using its transverse remanent magnetization V i. But still it is necessary to determine the top and the bottom of the carrot when it was in the ground before its sampling because, by neglecting the determination of this parameter, it is possible to make an error of up to one hundred and eighty degrees in determining the orientation of this core
Pour pouvoir valider le résultat de la mesure effectuée comme décrit ci-dessus, il est donc nécessaire de déterminer aussi, si cela n'a pas été fait auparavant, le haut et le bas de la carotte, c'est-à-dire laquelle de ses extrémités était la plus haute sur la verticale du heu d'extraction de la carotte lorsque la carotte était encore dans le solTo be able to validate the result of the measurement carried out as described above, it is therefore necessary to also determine, if this has not been done before, the top and bottom of the carrot, that is to say which of its ends was highest on the vertical of the er of the carrot extraction when the carrot was still in the ground
Les roches terrestres possèdent une aimantation rémanente qui peut se décomposer en deux vecteurs, le vecteur aimantation rémanente transversale V, qui a été défini auparavant et un vecteur aimantation rémanente longitudinale V/ suivant l'axe de révolution 12 de la carotte 1 , figure 6Terrestrial rocks have a remanent magnetization which can be broken down into two vectors, the transverse remanent magnetization vector V, which was defined previously and a longitudinal remanent magnetization vector V / along the axis of revolution 12 of the core 1, figure 6
Or, en connaissant, d'une part le sens du vecteur aimantation rémanente longitudinale, et d'autre part l'époque de la formation de la couche rocheuse de laquelle a ete extraite la carotte et la position de cette couche rocheuse dans le sol, il est possible de déterminer le bas et le haut de la carotte dans cette couche Le mode de réalisation du dispositif selon l'invention schematiquement illustre sur la figure 7, qui constitue un perfectionnement a celui illustre sur les figures 1 a 4, permet de déterminer le haut et le bas de la carotteHowever, by knowing, on the one hand the direction of the vector longitudinal remanent magnetization, and secondly the time of forming the layer of rock which has been extracted the core and the positioning of this layer of rock in the ground, it is possible to determine the bottom and the top of the core in this layer. The embodiment of the device according to the invention schematically illustrated in FIG. 7, which constitutes an improvement to that illustrated in FIGS. 1 to 4, makes it possible to determine the top and bottom of the carrot
Ce mode de réalisation du dispositif comporte, en plus des moyens du mode de réalisation décrits ci-dessus en regard des figures 1 à 4, des moyens 91 pour mesurer l'aimantation longitudinale de la carotte 1This embodiment of the device comprises, in addition to the means of the embodiment described above with reference to FIGS. 1 to 4, means 91 for measuring the longitudinal magnetization of the core 1
Dans une réalisation particulièrement avantageuse, ces moyens 91 comportent une goulotte 92 définissant un logement 93 de réception de la carotte, ce logement ayant un axe longitudinal 94, l'axe de révolution 12 de la carotte étant parallèle à cet axe longitudinal 94 quand elle est située dans le logement Ces moyens 91 comportent en outre des moyens 95 pour positionner la goulotte par rapport au banc 2 de façon que l'axe longitudinal 94 du logement 93 soit sensiblement perpendiculaire à l'axe de révolution 12 de la carotte quand cette dernière est entraînée en rotation par rapport au berceau 3 lorsque le berceau est situe sur la première portion 5 du banc 2 comme défini ci-avantIn a particularly advantageous embodiment, these means 91 comprise a chute 92 defining a housing 93 for receiving the carrot, this housing having a longitudinal axis 94, the axis of revolution 12 of the carrot being parallel to this longitudinal axis 94 when it is located in the housing These means 91 further comprise means 95 for positioning the chute relative to the bench 2 so that the longitudinal axis 94 of the housing 93 is substantially perpendicular to the axis of revolution 12 of the carrot when the latter is driven in rotation relative to the cradle 3 when the cradle is located on the first portion 5 of the bench 2 as defined above
De façon préférentielle, pour permettre aux capteurs définis ci-avant, comme les capteurs Scintrex. de pouvoir fonctionner de façon optimum en utilisant le champ magnétique terrestre, ces moyens 95 comportent des moyens 96 pour monter la goulotte 92 rotative par rapport au banc 2 autour sensiblement du point de mesure 10 de façon a pouvoir orienter l'axe longitudinal 94 du logement 93 parallèle au champ magnétique terrestre du lieu où est effectuée la mesure, après avoir orienté le banc 2 suivant avantageusement la direction Est-Ouest comme cela a été explicité auparavantPreferably, to allow the sensors defined above, such as the Scintrex sensors. to be able to function optimally using the earth's magnetic field, these means 95 comprise means 96 for mounting the rotating chute 92 relative to the bench 2 around substantially the measurement point 10 so as to be able to orient the longitudinal axis 94 of the housing 93 parallel to the Earth's magnetic field where the measurement is made, after orienting the bank 2 advantageously following the East-West direction as explained above
Le dispositif décrit ci-dessus en regard de la figure 7 permet de déterminer, si cela s'avérait nécessaire, le haut et le bas de la carotte, c'est-à-dire son sens originel sur la verticale du heu où elle a été extraite, s'utilise et fonctionne de la façon suivanteThe device described above with reference to FIG. 7 makes it possible to determine, if it turns out to be necessary, the top and the bottom of the carrot, that is to say its original direction on the vertical of the er where it has been extracted, used and operated as follows
On commence par placer la carotte 1 dans le logement 93 défini dans la goulotte 92 et, au moyen des capteurs 21 et 23 définis ci-avant qui délivrent un signal représentatif d'une première valeur de l'aimantation suivant l'axe de révolution 12 de la carotte 1 En fait, cette première valeur correspond sensiblement à la valeur de l'aimantation due au champ magnétique terrestre au point de mesure 10 a laquelle s'est ajoutée ou retranchée la valeur de l'aimantation rémanente longitudinale de la carotte 1We start by placing the core 1 in the housing 93 defined in the chute 92 and, by means of the sensors 21 and 23 defined above which deliver a signal representative of a first value of the magnetization along the axis of revolution 12 of the core 1 in fact, this first value corresponds substantially to the value of the magnetization due to the terrestrial magnetic field at the measuring point 10 to which is added or subtracted the value of the longitudinal remanent magnetization of the core 1
La carotte 1 est ensuite retournée dans le logement 93 de façon a intervertir l'emplacement de ses deux extrémités On effectue une deuxième mesure avec les capteurs 21 et 23 qui délivrent un autre signal qui représente une seconde valeur de l'aimantation suivant l'axe de re\olutιon 12 de la carotteThe core 1 is then returned to the housing 93 so as to interchange the location of its two ends is carried out a second measurement with the sensors 21 and 23 which deliver a further signal representing a second value of the magnetization along the axis carrot re \ olutιon 12
Si, par exemple, la première valeur d'aimantation est supérieure a la seconde valeur, il est certain que l'aimantation rémanente longitudinale de la carotte a le même sens que le champ magnétique terrestre au point de mesure 10 Si la première valeur est inféπeure à la seconde, l'aimantation rémanente longitudinale de la carotte est de sens contraire a ce champ magnétique terrestreIf, for example, the first value of magnetization is greater than the second value, it is certain that the longitudinal remanent magnetization of the core has the same direction as the earth's magnetic field at the measuring point 10 if the first value is inféπeure per second, the longitudinal remanent magnetization of the core is in opposite directions has the Earth's magnetic field
En comparant les valeurs des deux mesures, il est donc possible de connaître l'orientation de l'aimantation rémanente longitudinale de la carotte et donc, après comparaison avec l'orientation de l'aimantation rémanente de l'endroit du sol dont a été extraite la carotte, de déterminer avec certitude le haut, et donc le bas, de la carotte By comparing the values of two measurements, it is therefore possible to know the direction of the longitudinal remanent magnetization of the core and therefore after comparison with the orientation of the remanent magnetisation of the area of soil which was extracted the carrot, to determine with certainty the top, and therefore the bottom, of the carrot

Claims
REVENDICATIONS
1 Dispositif permettant d'orienter des carottes (1) de forme cylindrique de révolution autour d'un axe de révolution (12), ces carottes ayant été prélevées dans un milieu rocheux ou analogue qui a été soumis, lors de sa formation, a un champ magnétique terrestre et qui a de ce fait une aimantation rémanente, caractérisé par le fait qu'il comporte1 device making it possible to orient cores (1) of cylindrical shape of revolution around an axis of revolution (12), these cores having been taken from a rocky environment or the like which was subjected, during its formation, to a Earth's magnetic field and which therefore has a remanent magnetization, characterized in that it comprises
- un banc (2),- a bench (2),
- un berceau (3),- a cradle (3),
- des moyens (4) pour associer le berceau (3) avec le banc,- means (4) for associating the cradle (3) with the bench,
- des moyens (7) pour entraîner la carotte ( 1 ) en rotation sensiblement autour de son axe de révolution (12) par rapport au berceau lorsque ledit berceau est situe en une première portion (5) du banc (2) et de façon que sa paroi latérale (9) passe sensiblement par un point dit "point de mesure" (10),- Means (7) for driving the core (1) in rotation substantially about its axis of revolution (12) relative to the cradle when said cradle is located in a first portion (5) of the bench (2) and so that its side wall (9) passes substantially through a point called "measuring point" (10),
- des moyens (8) pour mesurer le champ magnétique régnant audit point de mesure, ces moyens de mesure étant aptes a délivrer un signal dit "signal de mesure", et - des moyens (1 1 ) pour traiter le signal de mesure- Means (8) for measuring the magnetic field prevailing at said measurement point, these measurement means being capable of delivering a signal called "measurement signal", and - means (1 1) for processing the measurement signal
2 Dispositif selon la revendication 1 , caractérise par le fait que les ovens (8) pour mesurer le champ magnétique régnant audit point de mesure comportent au moins un premier magnetomètre (21 ) apte à délivrer en sortie (22) un premier signal représentatif de la valeur du champ magnétique mesure au point de mesure, ce premier signal constituant le signal de mesure2 Device according to claim 1, characterized in that the ovens (8) for measuring the magnetic field prevailing at said measurement point comprise at least a first magnetometer (21) capable of delivering at output (22) a first signal representative of the value of the magnetic field measured at the measurement point, this first signal constituting the measurement signal
3 Dispositif selon la revendication 2, caractérisé par le fait que les moyens (8) pour mesurer le champ magnétique régnant audit point de mesure comportent en outre un second magnetomètre (23), ledit second magnetomètre étant associé au premier de façon qu'il soit apte à mesurer le champ magnétique régnant au voisinage du point de mesure, le premier magnetomètre étant positionne en première position de Gauss et le second en seconde position de Gauss, ledit second magnetomètre étant apte a délivrer en sortie (24) un deuxième signal représentatif de la valeur du champ magnétique mesure au voisinage du point de mesure, la combinaison des deux premier et deuxième signaux constituant le signal de mesure 4 Dispositif selon 1 une des revendications 2 et 3, caracteπse par le fait que les moyens (8) pour mesurer le champ magnétique régnant audit point de mesure comportent en outre des moyens (25) pour contrôler le champ magnétique ambiant autour au moins du premier magnetomètre (21 ) 3 Device according to claim 2, characterized in that the means (8) for measuring the magnetic field prevailing at said measurement point further comprises a second magnetometer (23), said second magnetometer being associated with the first so that it is suitable for measuring the magnetic field prevailing in the vicinity of the measurement point, the first magnetometer being positioned in the first Gauss position and the second in the second Gauss position, said second magnetometer being capable of outputting (24) a second signal representative of the value of the magnetic field measured in the vicinity of the measurement point, the combination of the two first and second signals constituting the measurement signal 4 Device according to 1 one of claims 2 and 3, characterized by the fact that the means (8) for measuring the the magnetic field prevailing at said measurement point further comprises means (25) for controlling the ambient magnetic field around at least the first ma gnetometer (21)
5 Dispositif selon l'une des revendications 2 à 4, caractérisé par le fait qu'il comporte en outre des moyens (26) pour mesurer les variations du champ magnétique ambiant, ces derniers moyens étant aptes à délivrer en sortie (27) un troisième signal représentatif de ces variations, la combinaison au moins des premier et troisième signaux constituant le signal de mesure 5 Device according to one of claims 2 to 4, characterized in that it further comprises means (26) for measuring the variations of the ambient magnetic field, the latter means being capable of delivering at output (27) a third signal representative of these variations, the combination of at least the first and third signals constituting the measurement signal
6 Dispositif selon l'une des revendications 1 à 5, caractérisé par le fait qu'il comporte en outre des moyens (30) pour effectuer une désaimantation partielle de la carotte ( 1 ) avant de déterminer son orientation6 Device according to one of claims 1 to 5, characterized in that it further comprises means (30) for carrying out partial demagnetization of the core (1) before determining its orientation
7 Dispositif selon la revendication 6, caractérisé par le fait que les moyens (30) pour désaimanter partiellement la carotte avant de déterminer son orientation comportent des moyens (31) pour réaliser un espace isolé magnétiquement (32), cet espace étant défini autour d'une deuxième portion (33) du banc (2) différente de la première portion (5 ), et des bobines (34) aptes à créer un champ magnétique de désaimantation d'une valeur contrôlée7 Device according to claim 6, characterized in that the means (30) for partially demagnetizing the core before determining its orientation comprises means (31) for producing a magnetically isolated space (32), this space being defined around a second portion (33) of bench (2) different from the first portion (5), and coils (34) capable of creating a demagnetization magnetic field of a monitored value
8 Dispositif selon Tune des revendications 1 a 7, caractérise par le fait qu'il comporte en outre des moyens (40) pour indexer angulairement la carotte ( 1 ) par rapport au banc (2)8 Apparatus according to one of claims 1 to 7, characterized in that it further comprises means (40) for angularly indexing the core (1) with respect to bench (2)
9 Dispositif selon la revendication 8. caractérisé par le fait que les moyens (40) pour indexer angulairement la carotte par rapport au banc comportent au moins un repère (41 ) situé sur la paroi latérale cylindrique (9) de la carotte (1 ) et des moyens (42) pour déterminer la position du repère (41 ) par rapport au banc (2) quand la carotte (1 ) est positionnée sur le berceau (3)9 Device according to claim 8. characterized in that the means (40) for angularly indexing the core relative to the bench comprise at least one mark (41) located on the cylindrical side wall (9) of the core (1) and means (42) for determining the position of the mark (41) relative to the bench (2) when the core (1) is positioned on the cradle (3)
10 Dispositif selon la revendication 9, caractérise par le fait que les moyens (42) pour déterminer la position du repère (41 ) par rapport au banc (2) quand la carotte (1 ) est positionnée sur le berceau (3) comportent des moyens pour entraîner la carotte en rotation autour de son axe de révolution lorsque le berceau (3) est situé en une troisième portion (43) du banc, au moins une cellule (44) de détection du repère (41 ) et des moyens (45) pour fixer la cellule (44) dans une position prédéterminée par rapport au banc (2) et en regard de la carotte ( 1 ) quand cette dernière est située sur le berceau (3) et que ce berceau se trouve sur la troisième portion (43) du banc (2)10 Device according to claim 9, characterized in that the means (42) for determining the position of the mark (41) relative to the bench (2) when the core (1) is positioned on the cradle (3) comprise means to drive the carrot in rotation about its axis of revolution when the cradle (3) is located in a third portion (43) of the bench, at least one cell (44) for detecting the mark (41) and means (45) to fix the cell (44) in a predetermined position relative to the bench (2) and facing the core (1) when the latter is located on the cradle (3) and this cradle is on the third portion (43 ) of the bench (2)
1 1 Dispositif selon la revendication 10, caractérise par le fait que le banc (2) a la forme d'un rail, le berceau (3) celle d'un chariot, et que les moyens (4) pour associer le berceau (3) avec le banc (2) comportent des moyens (50) pour monter le chariot en translation sur le rail et des moyens (51 ) pour commander la translation du chariot le long du rail January 1 Apparatus according to Claim 10, characterized in that the bench (2) has the shape of a rail, the cradle (3) that of a carriage, and that the means (4) for associating the cradle (3 ) with the bench (2) comprise means (50) for mounting the carriage in translation on the rail and means (51) for controlling the translation of the carriage along the rail
12 Dispositif selon la revendication 1 1, caractérisé par le fait que les moyens (51 ) pour commander la translation du chariot le long du rail sont constitués par un premier moteur (52) et une chaîne sans fin (53) couplée au premier moteur via des moyens d'engrenage et à au moins un point (54) du chariot, de façon que la rotation commandée du premier moteur (52) entraîne le déplacement du chariot le long du rail dans un sens ou dans l'autre 12 Device according to claim 1 1, characterized in that the means (51) for controlling the translation of the carriage along the rail are constituted by a first motor (52) and an endless chain (53) coupled to the first motor via gear means and at least one point (54) of the carriage, so that the controlled rotation of the first motor (52) drives the movement of the carriage along the rail in one direction or the other
13 Dispositif selon l'une des revendications 1 1 et 12, caractéπsé par le fait que les moyens (7) pour entraîner la carotte en rotation sensiblement autour de son axe de révolution sont constitués par au moins deux rouleaux (61, 62) de forme cylindrique de révolution montés en rotation par rapport au berceau (3), les axes de révolution de ces deux rouleaux étant parallèles à la direction de translation du berceau (3) le long du banc (2). la distance séparant les deux axes de ces deux rouleaux étant au plus égale à la somme des rayons des deux rouleaux et du diamètre de la carotte ( 1) à orienter, et des moyens (63) pour commander la rotation des deux rouleaux dans le même sens 14 Dispositif selon la revendication 13, caractérise par le fait que les moyens (63) pour commander la rotation des deux rouleaux (61 , 62) dans le même sens sont constitues par un second moteur (64), un arbre de transmission (65) couple a ce second moteur et monte parallèle a la direction de translation du berceau (3) le long du banc (2), et des moyens (66) pour coupler l'arbre de transmission (65) avec les deux rouleaux de façon que la rotation de cet arbre de transmission entraîne la rotation des deux rouleaux dans le même sens13 Device according to one of claims 1 1 and 12, caractéπsé in that the means (7) for driving the core in rotation substantially about its axis of revolution are constituted by at least two rollers (61, 62) form cylindrical of revolution mounted in rotation relative to the cradle (3), the axes of revolution of these two rollers being parallel to the direction of translation of the cradle (3) along the bench (2). the distance separating the two axes of these two rollers being at most equal to the sum of the radii of the two rollers and the diameter of the core (1) to be oriented, and means (63) for controlling the rotation of the two rollers in the same direction 14 Device according to claim 13, characterized in that the means (63) for controlling the rotation of the two rollers (61, 62) in the same direction are constituted by a second motor (64), a transmission shaft (65 ) couple to this second motor and ascends parallel to the direction of translation of the cradle (3) along the bench (2), and means (66) for coupling the drive shaft (65) with the two rollers so that the rotation of this drive shaft causes the rotation of the two rollers in the same direction
15 Dispositif selon les revendications 12 à 14, caractérisé par le fait que les deux premier (52) et second (64) moteurs sont situes a l'extrémité (70) du banc la plus eioignee de la première portion (5) du banc et sont séparés de ce banc (2) par un écran magnétique (71 )15 Apparatus according to claims 12 to 14, characterized in that both first (52) and second (64) motors are situated has the end (70) most eioignee the bed of the first portion (5) of the bench and are separated from this bench (2) by a magnetic screen (71)
16 Dispositif selon l'une des revendications précédentes, caractéπsé par le fait qu'au moins le banc (2), le berceau (3), les moyens (4) pour associer le berceau (3) avec le banc et les moyens (7) pour entraîner la carotte en rotation sensiblement autour de son axe de révolution ^ 12^ sont réalisés dans des matériaux amarrnétιnuεs16 Device according to one of the preceding claims, caractéπsé in that at least the bench (2), the cradle (3), the means (4) for associating the cradle (3) with the bench and the means (7 ) to cause the carrot to rotate substantially around its axis of revolution ^ 12 ^ are made of ama rr nétι n uεs materials
17 Dispositif selon l'une des revendications 3 a 16. apte a être utilise sur Terre ou règne un champ magnétique Nord-Sud, caractéπsé par le fait que l'axe de mesure du premier magnetomètre (2 l ) est dispose suivant un angle α d'environ 25 par rapport a l'horizontale tandis nue l'axe ^ mesure du second mafτneî metre ^23^ est sensiblement vertical17 Device according to one of claims 3 to 16 adapted for use on Earth or reign a North-South magnetic field, caractéπsé in that the measurement axis of the first magnetometer (2 l) is next has an angle α about 25 relative al horizontally while the axis n ue ^ extent my second fτ nei meter ^ 23 ^ is substantially vertical
18 Dispositif selon l'une des revendications précédentes, caractérise par le fait qu'il comporte en outre des moyens (91 ) pour mesurer l'aimantation longitudinale de la carotte 18 Device according to one of the preceding claims, characterized in that it further comprises means (91) for measuring the longitudinal magnetization of the core
19. Dispositif selon les revendications 2 et 18, caractérisé par le fait que les moyens (91) pour mesurer F aimantation longitudinale de la carotte ( I ) comportent :19. Device according to Claims 2 and 18, characterized in that the means (91) for measuring the longitudinal magnetization of the core (I) comprise:
- une goulotte (92), ladite goulotte définissant un logement (93) de réception de la carotte, ce logement ayant un axe longitudinal (94), l'axe de révolution (12) de la carotte étant parallèle à cet axe longitudinal (94) quand elle est située dans le logement, et- A chute (92), said chute defining a housing (93) for receiving the carrot, this housing having a longitudinal axis (94), the axis of revolution (12) of the carrot being parallel to this longitudinal axis (94 ) when it is located in the accommodation, and
- des moyens (95) pour positionner ia goulotte par rapport au banc (2) de façon que Taxe longitudinal (94) du logement (93) soit sensiblement perpendiculaire à l'axe de révolution (12) de la carotte quand cette dernière est entraînée en rotation par rapport au berceau lorsque le berceau est situé sur la première portion (5) du banc (2). - Means (95) for positioning the chute with respect to the bench (2) so that the longitudinal axis (94) of the housing (93) is substantially perpendicular to the axis of revolution (12) of the carrot when the latter is driven in rotation relative to the cradle when the cradle is located on the first portion (5) of the bench (2).
20. Dispositif selon la revendication 19, caractérisé par ie fait que les moyens (95) pour positionner la goulotte (92) par rapport au banc (2) comportent des moyens (96) pour monter la goulotte rotative par rapport au banc (2) sensiblement autour dudit point de mesure (10) de façon à pouvoir orienter l'axe longitudinal (94) du logement (93). 20. Device according to claim 19, characterized by the fact that the means (95) for positioning the chute (92) relative to the bench (2) comprise means (96) for mounting the rotary chute relative to the bench (2) substantially around said measurement point (10) so as to be able to orient the longitudinal axis (94) of the housing (93).
EP00918965A 1999-04-19 2000-04-13 Device for directing drill hole cores Withdrawn EP1171767A1 (en)

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FR9904869 1999-04-19
FR9904869A FR2792420B1 (en) 1999-04-19 1999-04-19 DEVICE FOR ORIENTATION OF DRILL CORES
PCT/FR2000/000952 WO2000063688A1 (en) 1999-04-19 2000-04-13 Device for directing drill hole cores

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