FR2704899A1 - Method and device for injecting products into the soil - Google Patents

Abstract

The invention relates to a method for positioning an injection head inside a sleeved tube. Close to the sleeved tube (2), and preferably against its outer wall, there is placed at least one electronic tag (9) containing information; close to the injection head (5) there is placed a device (10) allowing information contained in the electronic tags (9) to be read; and the injection head (5) is positioned in the sleeved tube (2) on the basis of the information contained in the electronic tags (9) which are read by the reading device (10). The invention also relates to the implementation of such a method.

Description

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  The present invention relates to a method and a device

  to inject products into the soil.

  It is known, in particular to reinforce the solidity of the soil, to

  injecting products such as binders, for example cement-based.

  These injections are performed under relatively

  elevated in boreholes that are previously made.

  According to one of the known injection techniques, the borehole from which the injection is made is first made, then a device known under the term "cuff tube" is formed in this well. tube having in certain places openings, these openings being covered by portions of tube which are threaded on the tube to the right of the orifices and close these by

radial elasticity.

  To perform the injection, is introduced into the sleeve tube an injection head generally comprising two inflatable shutters separated by a certain distance, the two inflatable shutters are placed on either side of the orifices closed by a cuff, the shutters are inflated so that they bear tightly against the inner surface of the injection tube and the product to be injected is sent through a pipe which ends in the portion of tube between the two inflatable shutters where an overpressure is created which causes the separation of the sleeve, the release of the corresponding orifices of the tube, and the infiltration of the injection product into the

neighboring land.

  When the injection is complete, it is sufficient, to continue the injection of the product into the bore, to deflate the shutters and move the injection head to bring the inflatable shutters on either side of the closed openings with another headline and then repeat the operation. As is known, at the moment when the injection is interrupted, the sleeve retracts on the tube by closing the injection orifices and

  thus avoids the reflux of the product injected into the sleeve tube.

  This device, which is commonly used, has the drawback of sometimes raising difficulties, on the one hand for the identification of the borehole in which an injection must be made, and on the other hand for the correct positioning of the two inflatable obturators. the inside of the tube

with cuffs.

  The present invention relates to a method and a device which make it possible to solve this problem by automatically providing

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  the identification of the borehole and the positioning of the injection head at

the inside of the sleeve tube.

  The present invention relates to a method for positioning an injection head inside a sleeve tube, characterized in that it is placed in the vicinity of the sleeve tube and preferably against the outer wall of this tube. last, at least one electronic tag containing information and preferably capable of recording information; placing in the vicinity of the injection head, a device for reading and preferably writing information in the electronic tags; and positioning the injection head in the sleeve tube according to the information contained in the electronic tags that are read by the device

reading.

  According to a preferred embodiment of the invention applying for example to downward drilling, an electronic tag is placed above and at a predetermined distance from each cuff, while the device is placed in position. reading at a point of the injection head such that, when this device passes to the right of an electronic tag, the two inflatable shutters of the injection head are located on either side of the orifices closed by a cuff , and that the displacement of the injection head is stopped when the reading device is located at the right of the electronic tag which is placed above the sleeve through which the injection must be made. According to a preferred embodiment of the invention, the device for reading the contents of the labels, which is placed in the injection head, is connected to a central computer and preferably to a control terminal, which make it possible to centralize the information contained in the various labels, to ensure the positioning of the injection head, the swelling of the shutters and the control of the

  characteristics of the injection that is practiced.

  According to a preferred embodiment of the invention, there is also, in the vicinity of the entrance of the borehole, an electronic tag

  which contains information in the memory to identify the borehole.

  The reading of this label by the reading device makes it possible to recognize with certainty the borehole in which the injection head is introduced and possibly to interrupt the process if the operator has

  erred in the identification of the borehole.

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  The information that is contained in the labels

  electronic devices can be of various kinds.

  This information can for example identify a sleeve whose position is predetermined with respect to the injection tube, which is to say that this identification confirms that the injection head is

found at a known point in the borehole.

  Advantageously, electronic labels are used which are

  also able to record information.

  In this case, the reading device placed in the injection head is also able to send information to the

  labels, so that it constitutes a reading and writing device.

  The various labels can thus receive in their memory information concerning the history of the injections which concern them, for example their number, their date, their duration and the nature

of the injected product.

  Naturally, these various pieces of information are also advantageously stored in the central computer and displayed on the control terminal of the operator according to the needs of the latter. The electronic tags may be of the type known as a transponder, for example those which are marketed under

  the TIRIS brand by TEXAS INSTRUMENTS.

  These labels, which may for example be in the form of a glass tube approximately 4 mm in diameter and 30 mm long, comprise an antenna capable of receiving a radio-electric wave from which a capacitor can be charged. whose energy is used to transmit to the reading and writing device the information which is contained in the memory of the tag or to write in the memory of the tag information from the reading device and

writing.

  These labels can be used, either for read-only or for reading and writing, which is preferable according to a setting.

preferred embodiment of the invention.

  The device for reading and writing the labels emits a radio-electric wave, for example at a frequency of 100 to 150 kHz, so that when it passes close to a label, it activates it and can

  to exchange information with her.

  This information makes it possible, for example, for the reading and writing device, which is integral with the injection head, to control the

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  move the latter so that it is positioned relative to the label so that the injection can be made through the

headline concerned.

  The present invention also relates to a device for producing product injection into the ground, of the type in which an injection head is engaged inside a sleeve tube which is introduced into an injection borehole. , characterized in that electronic tags are placed at different locations of the sleeve tube, preferably outside the sleeve tube, and that the injection head comprises a reading device and preferably a device for writing information. stored in the electronic tags, this reading and writing device being automatically connected to a central computer and preferably also to a control terminal for storing the information from the labels and to control the positioning

  of the injection head and the control of the actual injection.

  The device according to the invention can advantageously use electronic tags which are fixed on the periphery of the tube

  injection outside the latter and in the vicinity of the cuffs.

  In a preferred embodiment, there is also at the inlet of the injection port, an electronic tag which contains

  in memory of the information identifying the drilling.

  According to the invention, the injection tube is made of a material that allows the electromagnetic waves to pass and thus allows the reading and writing device to communicate with the different labels. Thus, according to the invention, the injection tube can

be made for example of PVC.

  In order to better understand the invention, we will now describe by way of illustration and without any limiting character

  an embodiment taken as an example and shown in the drawing.

  The single figure of this drawing is a schematic sectional view

  of a device for implementing the invention.

  Diagrammatically shown in the drawing a borehole 1 inside which is introduced a sleeve tube 2 which has in two places injection orifices 3 covered in the known manner of

headlines 4.

  An injection head, generally designated by the reference numeral 5, comprises in the known manner two inflatable shutters 6 and 7 which are spaced a sufficient distance to be able to be placed on each side.

  other holes 3 covered by a sleeve 4.

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  In the single figure of the drawing, the two

  inflatable shutters 6 and 7, on either side of the upper ports 3.

  The injection head 5 is connected to the surface of the ground by an injection pipe 8a through which the product to be injected into the ground can be sent under pressure in the portion of the sleeve tube 2

  between the two inflatable shutters 6 and 7.

  The injection head 5 is also connected to a compressed fluid pipe 8b, for example compressed air or water underwater.

  pressure, which is used for the swelling of the shutters 6 or 7.

  According to this embodiment of the invention, labels 9 are attached to the outer wall of the sleeve tube. These labels 9 may be transponders marketed under the brand

  TIRIS by the company TEXAS INSTRUMENTS.

  In a first step, such tags collect, by an antenna, the energy of a wave emitted by a reading and writing device, which enables them to charge a capacitor which they are internally provided with, and then, in a second time, using the energy contained in this capacitor, they emit a radio wave which is received by the reading and writing device, said wave being frequency modulated so as to transmit the information contained therein

in the transponder memory.

  It is also possible for the reading and writing device

  to send information to a label that stores them in its memory.

  There is shown in the drawing a reading and writing device 10 which can cooperate with the tags to exchange with them.

informations.

  It is also schematically represented how the reading and writing device 10 is connected, by a cable 11, on the one hand to a central computer in the direction of the arrow 12, and on the other hand to a

  control terminal in the direction of the arrow 13.

  In the embodiment shown, it has also been arranged in a fixed position, at the drill head, and inside a protective tube of

  small diameter adjacent to the sleeve tube 2, another label 14.

  The information contained in the memory of the tag 14 serves to identify the borehole during the introduction into the latter of the reading and writing device 10 which thus passes in the vicinity of

the label 14.

  According to the invention, the injection tube 10 is made of

  a material permeable to electromagnetic waves, for example PVC.

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  It is not necessary to make any electrical supply connection between the labels, since the latter are passive components that need no other energy than that provided to them by the reading device and writing in the form of electromagnetic waves during the passage of the latter in the vicinity

of each label.

  To implement the invention, it is possible, for example, to operate as follows: As soon as the drilling 1 is made, the label 14 is placed at the top of the latter and it is recorded in the memory of this label. 14 the identification of the borehole. Advantageously, this tag 14 may also contain in a non-erasable manner a serial number and a

  code identifying the company making the injection.

  Before introducing the sleeve tube 2 into the borehole 1, the electronic labels 9 which are placed at its periphery are subjected to its periphery.

  a predetermined distance above the cuffs 4.

  The attached drawing shows only two injection points with cuffs, but it is clear that the cuff tube may have many more injection points, all of which have labels.

arranged in the same way.

  The sleeve tube is then introduced into the borehole 1.

  The reading and writing device 10 is then placed on the injection head, for example at a place such that, when the reading and writing device 10 is opposite a label 9, the inflatable shutters 6 and 7 are located on either side of the orifices 3

  closed by the sleeve 4 corresponding to the label 9.

  The injection head 5 is introduced into the sleeve tube by being conventionally suspended to the injection pipe 8a. The compressed air or pressurized water pipe 8b allows the

  swelling and deflation of the shutters 6 and 7.

  When the injection head 5 is lowered in the usual way into the sleeve tube 2, the reading and writing device 10 begins to record the information contained in the memory of the electronic tag 14, which allows the operator to check

  the identification of the borehole 1 in which the injection will be made.

  If this identification is correct, the injection head is gradually lowered into the sleeve tube 2, the reading and writing device 10 successively reading the identification of cuff

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  which is entered in the memory of each corresponding electronic tag. When the reading and writing device 10 arrives at the desired electronic label 9, the two shutters 6 and 7 are automatically positioned on either side of the orifices 3 which are

  covered by the cuff 4 concerned.

  The central computer then causes the valves 6 and 7 to swell and performs the injection under predetermined conditions, for example of duration or maximum pressure, which can be determined according to the information recorded in the label.

electronic 14.

  When the injection is completed, the writing and reading device 10 can, if necessary, introduce the information concerning the injection into the memory of the electronic tag concerned, this information can thus be stored in the central computer in connection with the identification of the borehole and the identification of the concerned sleeve. It can be seen that the invention makes it possible in a simple and efficient way to accurately perform injections by operating automatically

and avoiding all errors.

  In addition, the invention makes it possible to keep in memory, in the central computer, and / or in the different labels, the characteristics of the different injections, which makes it possible to reconstruct

easily the history of the field.

  It is understood that the embodiment which has been described

  has only been given as an example and is not limiting in nature.

  In particular, it is clear that the invention is not limited to downward vertical drilling and that it can be carried out in

  boreholes oriented in any direction.

  It is also clear that the invention is not limited by the nature of the information that is exchanged between the reading device and

  writing and the different labels.

  Similarly, the invention is not limited to the use of a cuff tube in the strict sense of the term, but applies to any tube

equivalent injection.

  Finally, the position of the different labels has not been given. as an example but it goes without saying that the labels could be

positioned differently.

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Claims (10)

  Method for positioning an injection head inside a sleeve tube, characterized in that, in the vicinity of the sleeve tube (2), and preferably against the outer wall thereof, it is placed last, at least one electronic tag (9) containing information; a device (10) for reading information in the electronic tags (9) is placed in the vicinity of the injection head (5); and positioning the injection head (5) in the sleeve tube (2) according to the information contained in the   electronic tags (9) which are read by the reading device (10).   2. Method according to claim 1, characterized in that labels are used capable of recording information such as those known as the transponder, and a reading device (10) also allowing the information writing   in the electronic tags (9).   3. Method according to any one of claims 1 and 2,   applied to downwardly directed drilling, characterized in that an electronic label (9) is placed above and at a predetermined distance from each sleeve (4), while the reading device is placed and possibly writing (10) at a point of the injection head (5) such that, when this device (10) passes to the right of an electronic tag (9), two inflatable shutters (6, 7) of the injection head (5) are located on either side of orifices (3) closed by a sleeve (4), and that the movement of the injection head (5) is stopped inside. of the sleeve tube (2) when the reading device and possibly the writing device (10) is located at the right of the electronic label (9) which is placed above the sleeve (4) through which must make the injection.   4. Method according to any one of claims 1 to 3,   characterized in that the reading device and possibly the writing device (10) is connected to a central computer and preferably to a control terminal.   5. Device according to any one of claims 1 to 4,   characterized in that in the vicinity of the borehole inlet (1) there is also an electronic tag (14) which contains   information to identify the drilling (1).   6. Process according to any one of claims 1 to 5,   characterized in that labels are stored in the memory - 9 - 2704899   (9) information concerning the history of the injections that concern them, such as their number, date, degree and nature of the product injected.   7. Device for producing the product injection into the soil by   implementation of the method according to any one of claims 1 to 6,   of the type in which an injection head is engaged inside a sleeve tube which is introduced into an injection borehole, characterized in that electronic tags (9) are placed at different locations of the tube cuffs (2), preferably outside the latter, and that the injection head (5) comprises a reading device   (10) information stored in the electronic tags (9).   8. Device according to claim 7, characterized in that the tags are capable of recording information and that the reading device (10) is able to send information to   labels (9) to write them there.   9. Device according to any one of claims 7 and 8,   characterized in that the reading device and possibly the writing device (10) is connected to a central computer and preferably   also at a control terminal.   10. Device according to any one of claims 7 to 9,   characterized in that the sleeve tube (2) is made of a material which allows electromagnetic waves, for example PVC, to pass through.