EP0710319B1 - Method and device for detecting and/or measuring at least one geophysical parameter on a core sample - Google Patents

Abstract

Method and device for detecting and/or measuring at least one geophysical parameter on a core sample (1), particularly in the oil industry, comprising, during a core sampling operation with a core sampler (2), an assembly which is substantially fixed with respect to the sampler (2), a sensor (3) for the detection and/or measurement of said parameter, directly downstream of the outlet (5) of the sampler (2) with respect to the removal direction of the core sample (1), at the vicinity of the removal path of the core sample (1), detecting and/or measuring values of the parameter at least at one location of the core sample (1) while the latter is removed from and/or returned to the core sampler (2), and processing the detected and/or measured values of the parameter for storing them and/or using them immediately.

Description

The present invention relates to a method of detection and / or measurement of at least one geophysical parameter on a carrot, especially in the field tanker.

Interesting geophysical parameters for those skilled in the art in the study of wells tankers being drilled are for example radioactivity natural carrot, the absorption of a known radiation emitted by a known source willing to proximity of the carrot, and the value of saturation in carrot liquid (value measured by induction).

To date, measurements and / or detections of these kind of parameters are achieved by having substantially horizontally on the ground the carrot that it was removed from the well and moved by hand, the along the carrot, a cart equipped with the instrument (s) of measurement.

This way of acting has disadvantages important among which there is first the manipulation carrot. Although it is contained in an internal core barrel, to transport the carrot, for example to put it on the ground, detach the successive internal tubes from one another, break the carrot at the junctions of these tubes and cut off the carrot, and the inner tube that contains it, transportable sections of the order of one meter long about and you have to close the ends of these sections. This cutting and closing operations and transport changes the carrot layers, especially at the two ends of each section, and so distort the information that we could remove from measurements made along the sections and mainly at their ends.

The carriage being moved by hand, the speed, which is communicated to it is irregular and this may compromise the correct quality of the measurements.

Parameters of the above type are likely to be influenced by the environment of the carrot at the time of measurement or again, parameters alike from the environment are likely to add to the corresponding parameters of the carrot during the measurement made on it. So, when the carrot is arranged horizontally, one of its sides being closer to the ground than the other, this distance difference can change the result of the measure, or the soil can influence the instruments because of the proximity, especially since this proximity is asymmetrical with respect to the whole carrot mass. Ultimately, a lack of accessibility carrot does not optimize the measured.

The object of the present invention is to remedy to these problems by allowing detections to be made and / or measurements of geodetic parameters on a core who has undergone the least amount of manipulation possible, example because it has not yet been cut into sections, and which is located so as to suffer from the share of the environment as little influence as possible or the less asymmetrically possible, because it is by example still maintained, until the moment of detection and / or measurement, in a vertical position (therefore under a symmetrical influence of the ground) and sheltered in the tube external core barrel which is metallic and which forms this makes a screen to certain influences of the surrounding soil.

• un agencement, sensiblement fixe par rapport au carottier, d'un capteur de détection et/ou mesure dudit paramètre, directement en aval de l'orifice de sortie du carottier, par rapport au sens de retrait de la carotte, au voisinage du parcours de retrait de la carotte,
• une détection et/ou mesure de valeurs du paramètre en au moins un endroit de la carotte pendant que celle-ci est retirée du et/ou renvoyée dans le carottier, et
• un traitement de valeurs détectées et/ou mesurées du paramètre, pour leur mise en mémoire et/ou utilisation immédiate.

To solve the above problems according to the invention, the method comprises, during a coring operation with a corer:

• an arrangement, substantially fixed relative to the core barrel, of a sensor for detecting and / or measuring said parameter, directly downstream of the corer outlet orifice, relative to the direction of withdrawal of the core, in the vicinity of the course of carrot removal,
• detection and / or measurement of parameter values in at least one place in the core while it is removed from and / or returned to the core barrel, and
• a processing of detected and / or measured values of the parameter, for their storage and / or immediate use.

The present invention also relates to a device for detecting and / or measuring at least one geophysical parameter on a carrot, in particular in the petroleum field.

• un corps creux présentant deux ouvertures, situées à l'opposé l'une de l'autre suivant un axe longitudinal du corps creux, et un passage libre s'étendant entre les deux ouvertures, ces dernières et le passage libre étant agencés pour qu'une carotte, enfermée dans un tube interne de carottier, puisse passer librement d'une ouverture à l'autre à travers le corps creux,
• des moyens de fixation pour fixer de façon démontable, éventuellement avec un jeu déterminé, le corps creux à un tube externe du carottier, à l'extrémité de celui-ci par laquelle une carotte enfermée dans un tube interne est sortie, de façon que le corps creux soit situé, au moins en majeure partie, dans le prolongement du tube externe, les axes longitudinaux du corps creux et du carottier étant sensiblement coaxiaux, et
• au moins un capteur de détection et/ou mesure d'un paramètre géophysique à évaluer sur une carotte à retirer du carottier, ce capteur de détection et/ou mesure étant fixé au corps creux de façon qu'il soit agencé en face de la carotte, enfermée dans ledit tube interne, lorsque celle-ci est dans le passage libre précité.

According to the invention, said device comprises:

• a hollow body having two openings, located opposite one another along a longitudinal axis of the hollow body, and a free passage extending between the two openings, the latter and the free passage being arranged so that a core, enclosed in an internal core barrel, can pass freely from one opening to the other through the hollow body,
• fixing means for detachably fixing, possibly with a certain clearance, the hollow body to an outer tube of the core barrel, at the end of which by which a core enclosed in an inner tube is taken out, so that the hollow body is located, at least for the most part, in the extension of the outer tube, the longitudinal axes of the hollow body and the core barrel being substantially coaxial, and
• at least one detection and / or measurement sensor for a geophysical parameter to be evaluated on a core to be removed from the core barrel, this detection and / or measurement sensor being fixed to the hollow body so that it is arranged opposite the core , enclosed in said internal tube, when the latter is in the aforementioned free passage.

Other details and peculiarities of the invention will emerge from the secondary claims and of the description of the drawings which are annexed to the present brief and which illustrate, by way of examples non-limiting the method and an embodiment particular of the device according to the invention.

Figure 1 shows an elevation view and with partial breaks of a device of the invention, for the implementation of the method of the invention, the device being installed on a core barrel and being in during use.

FIG. 2 is a view with cross section, according to line II-II of Figure 1 and according to associated arrows, showing the attachment of the device supra at the corer.

FIG. 3 is a view with cross section, according to line III-III of Figure 1 and according to associated arrows, showing device guidance aforementioned compared to an internal core barrel passed in the device.

In the different figures, the same reference notations designate identical elements or the like.

The process according to the invention is intended the detection and / or measurement of at least one parameter geophysics on a core 1 (Figure 1), for example in an oil core. A geophysical parameter of this kind can be a natural radioactivity of constituents of the carrot, absorption of radiation emitted by a known radiation source, etc.

According to the invention, the method comprises, during a coring operation with a corer 2, an arrangement, substantially fixed relative to the corer 2, a sensor 3 for detecting and / or measuring the parameter concerned, directly downstream, in 4, of the outlet hole 5 of the core barrel 2 relative to the direction removing core 1 in the immediate vicinity (known of the person skilled in the art) of the course of withdrawal of the carrot 1. For example the sensor 3 can be a crystal of NaI which detects the part of radiation, from a source known from cesium 137 of 1 millicurie and located in 6, which is not absorbed by the constituents of carrot 1, to determine the part of radiation absorbed by these latter. Detection and / or measurement of the value of parameter is therefore carried out by this sensor 3 in one or several places of carrot 1 while it is removed from the core barrel 2 by known means and / or is returned to it by them. This procedure may aim for example to do several times the same detection and / or measurement in several places along the length of carrot 1 which has just been completed and is still in its infancy first manipulations unlike the previous process, so without being cut and passed from a position practically vertical up to for example a position horizontal before detection and / or measurement takes place above. A first processing of the values coming from detection and / or measurement can then also take place directly at the location of the coring, for example in order to sort these values to put them in memory or to use them immediately as explained below.

Preferably, the method according to the invention additionally, simultaneously with the detection and / or measure mentioned in 3, a statement of the position of the location corresponding to this detection and / or measurement on core 1 and, after this reading, processing of this for its storage and / or use immediate, for example to determine sections of carrot 1 which present detection results and / or specific measures.

Advantageously, a selection of one step substantially constant between two detection locations can be done in such a way as to facilitate this mapping between each detection location and / or measurement and this detection and / or measurement or to be able to more easily observe an evolution thereof. In addition, a selection of speed substantially constant of displacement during removal of the carrot 1 from the corer 2 or its return therein can favor detections and / or measurements which are influenced by this speed of movement. Until present this results from a manual action during a displacement of the aforementioned carriage and it is therefore essentially irregular.

Detections and / or measurements being made, according to the invention, directly at the drilling location, it is preferred, for example for their exploitation to transmit them remotely from the place above, where an operator can process them under cover and out of the way of the drilling or coring technicians well said.

The invention also relates to the device Cited above. In its simple form, this device 7 comprises a hollow body 10 having two openings 11 and 12 located opposite each other along an axis longitudinal 13 of the hollow body 10. Free passage 14 extends between openings 11 and 12 and is arranged by compared to these so that a carrot 1, enclosed in an internal tube 15 of the core barrel 2, can pass freely through the hollow body 10. The device 7 further comprises fixing means 16 for fixing removably the hollow body 10 to an external tube 17 of the core barrel 2, at the end 22 thereof through which a carrot 1 enclosed in the inner tube 15 came out of the core barrel 2. The hollow body 10 is then there fixed so as to be located, at least for the most part, in the extension of the outer tube 17, the axes longitudinal 13, hollow body 10, and 18 of the core barrel 2 being substantially coaxial. The hollow body 10 comprises at least one sensor 3 for detection and / or measurement a geophysical parameter to be evaluated on core 1 to remove from the core barrel 2. The sensor 3, an example of which is given above is fixed to the hollow body 10 to be arranged in front of the core 1 when it is in the free passage 14.

The aforementioned fastening means 16 can preferably constitute a detachable unit from the body hollow 10 and include (figure 3) two flange parts 20 and 21 adapted to the external diameter of the external tube 17 in order to be able to grip this tube 17 with force near its end 22 of the outlet of the core 1. Connection means 23 and clamping means 24 are arranged between the two flange parts 20 and 21. The means of link 23 are formed for example by a cross link 23 which links together, in an articulated manner, one end of a flange portion 20 at one end corresponding to the other flange part 21, so that these flange parts 20, 21 can be moved freely, for the embracing and for the liberation of the end 22, in a plane substantially perpendicular to the longitudinal axis 18. The two flange parts 20 and 21 can then be arranged to occupy one relative to the other two distinct positions, one first in which they enclose (Figures 1 and 3) securely the outer tube 17 when the device 7 is mounted on the latter, and a second position (not shown) in which the flange parts 20 and 21 are spaced apart from each other by a greater distance to the outer diameter of the outer tube 17, so that being able to mount the fastening means 16 and therefore the device 7 on the outer tube 17 or remove them therefrom.

In the example shown in Figure 3, the flange parts 20 and 21 and the cross member 23 have each an internal boss 25 including a peripheral surface internal is adapted to said external diameter of the tube external 17, the three internal bosses 25 being regularly distributed around the outer tube 17.

For the above clamping, the means of tightening 24 above are for example a screw 26 passing in a smooth hole 27 made in the free end of the flange part 21, and in a threaded hole 28 formed in the free end of the flange part 20. Advantageously the screw 26, the smooth 27 and threaded 28 holes have, in the assembled state, connecting means 23 and clamp 24 on the outer tube 17, a common axis which is parallel to the above-mentioned plane, perpendicular to the axis longitudinal 18, and which extends on the opposite side of the tube external 17 relative to the cross member 23, preferably parallel to the latter.

To connect the hollow body 10 properly said to the connecting means 23 and clamping 24, it is provided connection means 30 which may include projecting elements 31 and recesses 32 arranged on the hollow body 10 and for example on the flange parts 20 and 21 as shown in the figure 3. In this figure, a projection 31 is each time a overhanging spindle 31 fixed to the flange part 20 or 21 so that the two pins 31 are coaxial along a diameter of the outer tube 17, when the means fastening 16 enclose it in the assembled state of the device 7, and so that the free end of each pin 31 is turned towards the longitudinal axis 18. In the aforementioned mounted state, shown in FIGS. 1 and 3, pins 31 are passed through recesses or openings 32 made in corresponding ears 33, of the hollow body 10, fixed thereto at its end to be placed on the outer tube 17. Thus is formed by the shape of the hollow body 10 and the connection 23 and clamping means 24.

Preferably, play is provided between each pin 31 and the corresponding opening 32, for reasons explained below.

The connection by the aforementioned form can be released, in the case of the example above, by unscrewing the screws 26 so that one of the the other the flange parts 20 and 21, to loosen their grip on the outer tube 17, until the pins 31 can be removed from the openings 32.

Advantageously, to be able to possibly mount or dismount the corer 2 the hollow body 10, this last present overall, in cross section at its axis 13, a U-shape. A longitudinal side 35 (Figures 1 and 2) of the hollow body 10 is indeed open over its entire dimension taken parallel to the axis longitudinal 13 and on its transverse dimension at less equal to the outer diameter of the core 1 or preferably, from the inner tube 15. Thus the device 7 can be brought to or removed from the core barrel 2 by a transverse displacement to the axis 13 or 18 so the core 1 or the inner tube 15 can partially out of the core barrel 2 thus easily reach the free passage 14 from outside the hollow body 10 or vice versa, when mounting the latter on the corer 2 or disassembly respectively.

In a preferred embodiment of the invention, shown in Figures 1 and 2, the device 7 further comprises guide means 36 of the hollow body 10 relative to the inner tube 15. These guide means 36, comprising rollers 37 of which the axis of rotation is each time in a perpendicular plane to the longitudinal axis 13, are arranged so to be supported on the external surface of the internal tube 15. aforementioned when it is placed in the body hollow 10, in measurement and / or detection position. By example, the axes of rotation of two rollers 37A can be fixed relative to the hollow body 10 and can be located in the same plane perpendicular to the longitudinal axis 13, preferably opposite the longitudinal side open 35, relative to the longitudinal axis 13. In the present example of construction, two other rollers 37B can be provided on a support 38 mounted on the hollow body 10 through, on the one hand, a hinge 39 and, on the other hand, a screw 40 and a compression spring 41, so that it can be closed or open by this support 38 and the rollers 37B the side longitudinal 35. The axes of rotation of the two rollers 37B are in planes perpendicular to the longitudinal axis 13 and located on either side of the perpendicular plane common axes of rollers 37A. The projections on this latter plane rollers 37A and 37B are distributed over 360 ° around the projection of the tube internal 15 on this same plane.

As shown in Figure 1, the rollers of guide 37 are located at the end of the hollow body 10 away from the core barrel 2 in the assembled state of the device 7 on the core barrel 2.

In one embodiment of the invention sensor 3 formed by a NaI crystal is connected to a photomultiplier 50 for detecting rays gamma emitted by carrot 1 or for the measurement of these rays absorbed by this carrot 1.

For the operation of detection and / or measurement, sensor 3 can be connected by photomultiplier 50 to 51 signal processing unit of sensor 3 and this processing unit 51 can be connected to a transmission transmitter 52, for example wireless VHF, which is arranged to transmit on a distance of 50 to 100 m the signals processed and which is incorporated in the device 7. The transmitter 52, via its 52A antenna is then tuned to a receiver wireless transmission (not shown) arranged for receive processed signals and transmit them to a user. Preferably the transmitter 52 and the aforementioned receiver are each a transceiver combined and are arranged to be able to further control from the receiver (not shown), via of the transmitter 52, the processing unit 51.

A radioactive source 6 can be arranged in the hollow body 10 to radiate towards the carrot 1. The aforementioned sensor can then be arranged to perform a measure of the absorption of radiation from the source 6 by the core 1. Another sensor 53 can be mounted in the hollow body 10 for measuring radiation natural from carrot 1. This sensor 53 is then also connected to the processing unit 51 which, in this case, is arranged to also process signals from this other sensor 53 and to transmit them as above for use away from the platform drilling where coring and use takes place of the device 7.

The device 7 preferably includes its own 55 batteries for power supply electronic measuring, detection, processing, transmission, etc. above.

For the use of device 7, the tube internal 17 of the core barrel 2 can for example be blocked, in the rotation table 60 (figure 1) of the platform drilling, by wedge wedges 61. The end upper 62 of inner tube 15 can be gripped by known means 63, for the purpose of removing this tube internal 15 and the core 1 of the drilled well. These means of seizure 63 are for example suspended from a cable of a winch (not shown).

The hollow body 10 can be brought transversely to axis 18, when support 38 is pivoted to release the open longitudinal side 35, and the body hollow 10 is placed on the upper end 22 of the tube external 17 to be fixed there by the fixing means 16. A damping washer 64 (figure 1) can be disposed between the hollow body 10 and the upper end 22 cited above. After making this fixation by inserting pins 31 into holes 32 corresponding and by tightening the screw 26, the support 38 is positioned to close the longitudinal side 35 and the screw 40 is tightened to press, via of the spring 41, the rollers 37B in contact with the surface outer of inner tube 15 which also comes into contact with rollers 37A.

The device 7 being thus installed, the detection and / or measurement, processing devices signals and transmission can be engaged for perform measurements and / or parameter detection, their processing, possibly their storage in a memory incorporated in the device 7 and / or their remote transmission. The above winch is put on to remove the inner tube 15 and the carrot 1 it carries. Measurements and / or detections are performed. If necessary, the inner tube 15 and carrot 1 are lowered into the outer tube 17 to be pulled out again so you can repeat the measurements and / or detections either at the descent or at the descent and the ascent, and this can be repeated as often as desired, at a desired speed, constant preference.

After the measurement (s) and / or detections on the carrot 1, the device 7 can be removed by reversing the order of the operations mentioned above and the carrot 1 can then be processed in the usual way, for other useful analyzes in the case of drilling genre described above.

It should be understood that the invention is not in no way limited to the embodiments described and that many modifications can be made to these last without departing from the scope of the present invention.

For example, a coding wheel system for displacement and / or distance traveled by the tube internal 15 can be used to correlate a measurement location and the corresponding measurement, this system can be connected to the winch or be directly in contact with the inner tube 15.

A screen can be provided to close the side longitudinal 35 and to avoid thereby an influence unbalanced device 7 and / or the environment on core 1 intended for detection and / or measurement.

Claims (12)

1. Method for detecting and/or measuring at least one geophysical parameter from a core sample (1), in particular in the oil sector, comprising, during an operation of core drilling with a sampler (2),

   arranging, substantially fixed relative to the sampler (2), a sensor (3) for detecting and/or measuring said parameter, directly downstream of the exit orifice (5) of the sampler (2) relative to the direction of withdrawal of the core sample (1), in the vicinity of the withdrawal path of the core sample (1),

   detecting and/or measuring values of the parameter at at least one location on the core sample (1) while the latter is being withdrawn from and/or moved back in the sampler (2), and

   processing of the detected and/or measured values of the parameter, in order to store them in memory and/or use them immediately.
2. Method according to claim 1, characterized in that it further comprises, simultaneously with the detection and/or measurement of the parameter, acquisition of the position of the location corresponding to this detection and/or measurement on the core sample (1) and processing of this acquisition in order to store it in memory and/or use it immediately.
3. Method according to either of claims 1 and 2, characterized in that it comprises selection of a constant spacing of the successive detection and/or measurement locations and/or a substantially constant speed of movement of the core sample (1) withdrawn from or moved back in the sampler (2) during the detection and/or measurement.
4. Method according to any one of claims 1 to 3, characterized in that it further includes remote transmission of the detected and/or measured values, and optionally of the acquisition of the position of the above-mentioned locations.
5. Device for detecting and/or measuring at least one geophysical parameter from a core sample (1), in particular in the oil sector, comprising:

   a hollow body (10) having two openings (11, 12) situated opposite one another along a longitudinal axis (13) of the hollow body (10), and a free passage (14) extending between the two openings (11, 12), the latter and the free passage (14) being arranged so that a core sample (1), enclosed in an inner tube (15) of the sampler (2), can pass freely from one opening to the other (11, 12) through the hollow body (10),

   fixing means (16) for releasably fixing, optionally with defined play, the hollow body (10) at an outer tube (17) of the sampler (2), at the end (22) of the latter through which a core sample (1) enclosed in an inner tube (15) is extracted, so that the hollow body (10) is, at least for the most part, situated in the extension of the outer tube (17), the longitudinal axes (13 and 18, respectively) of the hollow body (10) and of the sampler (2) being substantially coaxial, and

   at least one sensor (3, 53) for detecting and/or measuring a geophysical parameter to be evaluated from a core sample (1) to be withdrawn from the sampler (2), this detection and/or measuring sensor (3, 53) being fixed to the hollow body (10) in such a way that it is arranged facing the core sample (1) enclosed in said inner tube (15) when this core sample is in the aforementioned free passage (14).
6. Device according to claim 5, characterized in that the fixing means (16) form a detachable constituent assembly of the hollow body (10) and comprise:

   at least two clamp parts (20, 21) matched to the external diameter of said outer tube (17) in order to be able to grip the latter securely in the vicinity of its end (22) for taking the core sample (1) out,

   linkage (23) and tightening (24) means arranged between the two clamp parts (20, 21) so that the latter can occupy relative to one another two separate positions, namely a first position in which they securely grip said outer tube (17) when the device (7) is mounted on the latter, and a second position in which they are separated from one another for mounting or dismounting the device (7) on or from the outer tube (17), and

   detachable connection means (30) for connecting, optionally with defined play, the linkage (23) and tightening (24) means and the hollow body (10) , these connection means (30) preferably comprising projecting elements (31) and recesses (32) arranged on the hollow body (10) and on the clamp parts (20, 21) in order to form an interlock linkage which, on the one hand, fixes, optionally with defined play, the hollow body (10) on the outer tube (17) when the clamp parts (20, 21) securely grip the latter when the hollow body (10) is mounted on the outer tube (17) and which, on the other hand, is released when the clamp parts (20, 21) are in their second position, separated from one another for mounting or dismounting the hollow body (10) on or from the sampler (2).
7. Device according to either of claims 5 and 6, characterized in that the hollow body (10) has an overall U-shape in transverse section, one longitudinal side (35) of the hollow body (10) being open over its entire dimension parallel to the axis (13) over a dimension transverse to this axis (13) at least equal to the external diameter of the core sample (1) or of the aforementioned inner tube (15), so as to make it possible to pass the core sample (1) or, respectively, the inner tube (15), transversely to the longitudinal axis (13) from the aforementioned free massage (14), through the open longitudinal side (35), out of the hollow body (10).
8. Device according to any one of claims 5 to 7, characterized in that it further includes means (36) for guiding the hollow body (10) relative to the inner tube (15), which means are fixed to the hollow body (10) and designed so as to bear on the outer surface of the above-mentioned inner tube (15) arranged in the hollow body (10), the bearing taking place at at least three contact points which, seen in projection onto a plane perpendicular to the above-mentioned substantially coaxial longitudinal axes (13, 18), are distributed over 360° around the inner tube (15), these bearing points being preferably in the same plane and/or on either side of this plane.
9. Device according to claim 7, characterized in that it further includes means (36) for guiding the hollow body (10) relative to the inner tube (15), which means are designed to bear on the outer surface of the latter which is arranged in the free passage (14) of the hollow body (10), and in that :

   a guide means comprises at least one roller (37B) which can rotate about an axis of rotation transverse to the longitudinal axis (13) and which is mounted removably on the hollow body (10), on the open longitudinal side (35) of the latter, in order to bear on the inner tube (15) on the same side (35) of the hollow body (10) relative to the longitudinal axis (13), and

   at least two other guide means, each comprising at least one roller (37A) which can rotate about an axis of rotation transverse to the longitudinal axis (13) and which is mounted fixed on the hollow body (10),

   the axes of rotation of the three rollers (37) being arranged around the free passage (14) so that the bearing points of the three rollers (37), projected into a plane perpendicular to the longitudinal axis (13), are substantially regularly distributed about the latter,

   preferably, the aforementioned rollers (37) are arranged at the end of the hallow body (10) situated away from the sampler (2) when the device is mounted on the latter.
10. Device according to any one of claims 5 to 9, characterized in that, as sensor (3), it includes a crystal, preferably sodium iodide, connected to a photomultiplier (50) in order to detect gamma rays in a core sample (1).
11. Device according to any one of claims 5 to 10, characterized in that the sensor (3, 53) is connected to a unit (51) for processing the signals detected and/or measured by the sensor (3) and in that the processing unit (51) is connected to a radio transmitter (52) which is designed for remote transmission of said processed signals, which is mounted in said detection and/or measurement device (7) and which is connected to a radio receiver designed to receive said transmitted signals and to send them to a user, the transmitter (52) and the receiver preferably being each a combined transmitter/receiver and being designed to be capable of controlling, from said receiver, via said transmitter (52), the processing unit (51) mounted in said device (7).
12. Device according to any one of claims 5 to 11, characterized in that it further includes a radioactive source (6), designed to radiate toward a core sample (1), and a sensor (53), in the form of a crystal, designed to measure the absorption of the radiation from the radioactive source (6) by the core sample (1), if appropriate said sensor (53) being connected to the processing unit (51) designed to process its signals and to send them to the transmitter (52) designed to transmit them to said receiver that is designed to receive them and send them to a user.

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