EP3754154A1 - Maschine zum aufbohren eines mit einer porösen schicht bedeckten bodens, und entsprechendes verfahren - Google Patents

Maschine zum aufbohren eines mit einer porösen schicht bedeckten bodens, und entsprechendes verfahren Download PDF

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Publication number
EP3754154A1
EP3754154A1 EP20179234.8A EP20179234A EP3754154A1 EP 3754154 A1 EP3754154 A1 EP 3754154A1 EP 20179234 A EP20179234 A EP 20179234A EP 3754154 A1 EP3754154 A1 EP 3754154A1
Authority
EP
European Patent Office
Prior art keywords
drilling
machine
protection tube
drill rod
porous layer
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.)
Granted
Application number
EP20179234.8A
Other languages
English (en)
French (fr)
Other versions
EP3754154B1 (de
Inventor
Bruno DEMARCQ
Christophe REYNA
Maxime SITERRE
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.)
Soletanche Freyssinet SA
Original Assignee
Soletanche Freyssinet SA
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 Soletanche Freyssinet SA filed Critical Soletanche Freyssinet SA
Publication of EP3754154A1 publication Critical patent/EP3754154A1/de
Application granted granted Critical
Publication of EP3754154B1 publication Critical patent/EP3754154B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes

Definitions

  • the present invention relates to the field of drilling techniques in the ground, and more particularly to the so-called small perforation drilling techniques under fluid circulation.
  • a reinforcement is then placed in the borehole, or else the tool is left in the borehole with its drive rod, before injecting a sealing grout therein.
  • One solution to protect a platform against infiltration is to recover the fluid at the drilling head. Such a solution is usually done by digging a pit in which a suction (pump) is immersed. Alternatively, there are also bins drilled to the right of the borehole and fitted with a suction mouth, which makes it possible to avoid the digging of the pit.
  • a suction pump
  • the present invention aims to solve the various technical problems mentioned above.
  • the present invention aims to provide a machine making it possible to limit the infiltration of drilling fluid and to preserve the upper layer of the drilled soil.
  • the present invention aims to provide a drilling machine which does not allow the platform to be destructured and which does not require the installation of a recovery tank.
  • a machine for drilling, under fluid circulation, a ground covered with a porous layer, for example a layer of ballast includes a drive head for rotating a drill pipe, and means for circulating a drilling fluid configured to inject a drilling fluid through the drill pipe.
  • the machine is also configured to insert, through the porous layer, a protective tube extending around the drill pipe and leaving an intermediate tubular space between the drill pipe and the protective pipe.
  • the machine also comprises first means for recovering the drilling fluid configured, during the insertion of the protection tube through the porous layer, to suck, from the upper end of the protection tube, the drilling fluid coming from the drill rod, present at the lower end of the protective tube and rising, preferably, via said intermediate tubular space.
  • the machine according to the present invention uses a protective casing, in addition to the drill rod, without using a double head, to maintain the integrity of the platform, and in particular of the porous layer, and ensures sealing by continuous suction at the top of the casing. It is then possible to have an autonomous use of the machine not requiring a previous step, such as that the establishment of a pit or drilled tanks, while limiting the infiltration of drilling fluid, in particular in the porous layer.
  • the machine also comprises second means for recovering the drilling fluid, the second recovery means being configured to evacuate the drilling fluid coming from the drill rod and coming out through the upper end of the protection tube, preferably via said intercalary tubular space, when the protective tube is positioned through the porous layer.
  • the protective tube remains in place, to continue to isolate the borehole, and in particular the circulation of drilling fluid, from the porous layer. Moreover, the protective tube is detached from the machine, and in particular from the drive head. At the same time, the drilling tool continues to dig, under the porous layer, with a circulation of fluid: the latter is then recovered through the tubular space interposed between the protection tube and the drilling rod.
  • the first and second recovery means comprise a common pump and a connecting means configured to connect the common pump to the first recovery means during the insertion of the protection tube through the porous layer, and to connect the common pump. to the second recovery means when the protective tube is positioned through the porous layer.
  • the drilling fluid is not recovered in the same way in the different stages of drilling, in particular because the protection tube is gradually inserted with the drill rod at first, then remains static in a second. time, when positioned through the drill bed.
  • the recovery means used are different according to the drilling stages, but can be connected to the same pumping means in order to limit the costs and the volume of the machine.
  • the second recovery means are configured to be positioned at the upper end of the protection tube when the protection tube is positioned through the porous layer, the second recovery means comprising a reservoir, preferably in the form of a crown, into which the drilling fluid coming out of the protection tube is poured, and a peripheral seal, preferably circular, creating a seal between the reservoir and the outer wall of the protection tube.
  • the upper end of the latter generally comes flush with the surface of the drilled soil.
  • the drilling fluid injected at the level of the drilling tool can go up alone, under the effect of the pressure and / or the flow, to said upper end of the protective tube. In order to recover this drilling fluid, it is then no longer sufficient to collect it in a reservoir situated at the upper end of the protection tube, and to suck it up with a pump.
  • the peripheral seal is an inflatable seal.
  • the inflatable seal allows easy installation at the upper end of the protection tube, while ensuring a desired seal by controlling the pressure applied in the inflatable seal.
  • the drive head is configured to also drive the protection tube in rotation, preferably at the same time as the drill rod, during the insertion of the protection tube through the porous layer.
  • the rotational drive of the protective tube makes it easier to insert it into the ground, and in particular through the porous layer, at the same time as the drill rod.
  • Such a drive does not require double head equipment, but can be done simultaneously with the drill rod. Once the protection tube is positioned, it is then sufficient to detach it from the drive head to leave it in place, and to continue only with the drill rod.
  • the drive head comprises means for mounting the drill rod, having a first determined diameter, and means for mounting the protection tube, having a second determined diameter greater than the first determined diameter.
  • the drill rod and the protective tube are mounted on the head by mounting means which may differ only in their diameter. This facilitates the use of the machine, allowing installation and removal procedures which are similar for the protection tube and the drill pipe.
  • the first means for recovering the fluid are mounted on the drive head, for example above the means for mounting the protection tube.
  • Such a mounting of the first recovery means on the drive head makes it possible to keep the suction at the upper end of the protection tube throughout the duration of the insertion of said protection tube through the porous layer and the sub-layer. underlying.
  • a work train comprising a machine for drilling a ground covered with a porous layer as described above.
  • the drilling machine has been designed so as to allow the use of standard equipment, and not heavy equipment such as a double head or specific duplicate equipment for the protective tube on the one hand and for the drill rod on the other hand. It then becomes possible to install it on a railway vehicle, such as a work train, in order to be able to move it along the site, as the work progresses.
  • the work train comprises a drilling fluid reservoir connected to the drive head, means for sucking up the drilling fluid configured to be connected to the recovery means, and means for supplying a cement grout configured. to be connected to the drive head.
  • Such a work train can thus transport the various elements necessary for the operation of the machine for drilling and for carrying out the work.
  • the works train also comprises a sludge recovery system, for example a settling tank, mounted downstream of the recovery means.
  • a sludge recovery system for example a settling tank, mounted downstream of the recovery means.
  • the sludge recovery system can be configured to operate with the sludge from the first recovery means and sludge from the second recovery means.
  • the sludge recovery system makes it possible in particular to recover part of the drilling fluid directly on the work train for reuse in situ, and makes it possible to store the material removed during drilling in order to limit the impact of the work on the site.
  • a method for drilling under circulation of fluid, in a ground covered with a porous layer, for example a layer of ballast.
  • a drill pipe is rotated, and a drilling fluid is injected through the drill pipe, preferably during the rotation of the drill pipe.
  • a protective tube extending around the drill pipe and leaving a tubular space between the drill pipe and the protective pipe is inserted through the porous layer, and suction is carried out from there.
  • the upper end of the protection tube, the drilling fluid coming from the drill rod present at the lower end of the protection tube and rising, preferably, via said intermediate tubular space, during the insertion of the protection tube through the porous layer.
  • the protection tube is left in place and the drilling fluid coming from the drill rod and emerging through the upper end of the tube is evacuated. protection, preferably via said intermediate tubular space.
  • the protective tube is driven at the same time as a first part of the drill rod equipped, at its end, with a tool, then, during the second step, a second part of the rod is assembled. to the first drill pipe part and the two drill pipe parts are rotated while injecting a drilling fluid through and discharging the fluid exiting through the upper end of the protection tube, preferably via said intercalary tubular space.
  • the machine for drilling 1 thus comprises a support 2 on which a frame 4 is mounted.
  • the support 2 is intended to come, integrally, on a railway carrier (not shown), conventionally a railway car, making it possible to transport and route the machine for drilling 1 along the rails R of a railway track.
  • a railway carrier not shown
  • Such an embodiment is particularly advantageous when the drilling machine 1 is used to install catenary pylon micropiles along the railway track, through the ballast layer.
  • the frame 4 In order to deploy and store the machine for drilling 1 on the wagon, the frame 4 is rotatably mounted on the support 2, relative to a vertical axis: it is thus possible to position the drilling tool next to the rail carrier , or else above the rail carrier, depending on whether the drilling machine 1 must install a pylon micro-pile or else must be moved.
  • the drilling machine 1 also comprises a mast 6 extending in a longitudinal direction, and mounted to pivot on the frame 4, relative to a horizontal axis, for example via jacks 8.
  • the jacks 8 thus make it possible to position the mast 6 horizontally, in particular above the rail carrier, when the drilling machine 1 is to be moved, or else vertically, as illustrated in the figure figure 1 , when the machine for drilling 1 needs to install a pylon micro-pile.
  • the mast 6 In the drilling position, as shown in figure 1 , the mast 6 has a lower end 6a intended to come to rest on the surface to be drilled.
  • the drilling machine 1 further comprises a carriage 10 slidably mounted along the mast 6.
  • the carriage 10 can be moved along the mast 6 by means known elsewhere and not shown here.
  • the carriage 10 comprises in particular a rotation table 12 configured to drive in rotation a drive head 14 on which the drilling tool will be mounted.
  • the drilling tool of the present machine for drilling 1 comprises on the one hand a drilling rod and on the other hand a protective tube independent of the drilling rod and surrounding the latter at the level of the upper portion of the borehole.
  • the drive head 14 comprises in particular first mounting means 16, for example an internal thread, configured to allow the mounting of a drill rod 18, comprising a corresponding external thread, on the drive head 14.
  • the head drive 14 also comprises second mounting means 20, for example an external thread, configured to allow the mounting of a protection tube 22, comprising a corresponding thread, on the drive head 14.
  • the first mounting means 16 and the second mounting means 20 are arranged coaxially on the drive head 14, in order to obtain a mounting of the drill rod 18 parallel to the mounting of the protection tube 22. , and include different diameters corresponding to those of the drill rod 18 and the protection tube 22.
  • the drill rod 18 and the protection tube 22 are driven simultaneously, together, by the drive head 14 when ' they are mounted on the means 16 and 20 respectively.
  • the drilling machine 1 also comprises a circuit for circulating a drilling fluid.
  • the drilling fluid can for example be water, and is circulated by the drilling machine 1 in the drilling zone in order to extract the drilled material therefrom.
  • the drive head 14 thus comprises a supply channel 24 for drilling fluid connected to means for supplying and circulating under pressure a drilling fluid (not shown).
  • the drill pipe 18 also includes an axial channel 26 which comes into fluid communication with the supply channel 24 of the drive head 14 when the drill pipe 18 is mounted on the drive head 14. The drilling fluid is thus injected under pressure inside the drilling rod 18, in order to come out at the other end of the drilling rod 18 on which is mounted a cutting tool 28 (see figure 3 ).
  • the protection tube 22 is designed with an inner diameter greater than the outer diameter of the drill rod 18, so as to create, when the drill rod 18 and the protection tube 22 are mounted on the drive head 14, an intermediate tubular space 29 extending from the lower end of the protection tube 22 to the first and second mounting means 16, 20 of the drive head 14.
  • the drive head 14 is configured to extend the intercalary tubular space 29 beyond the first and second mounting means 16, 20, to the first means 30 for collecting drilling fluid.
  • the first recovery means 30 are mounted on the drive head 14, above the first and second mounting means 16, 20, and make it possible to recover, or to suck thanks to suction means not shown , the drilling fluid loaded with drilled material and rising from the bottom of the borehole via the intercalated tubular space 29.
  • This recovery, or suction, of the drilling fluid loaded with drilled material takes place as it goes, and throughout the descent of the drill rod 18 and of the protective tube 22 in the ground, and more particularly in the porous upper layer P of ballast.
  • the machine for drilling 1 also comprises second recovery means 32 mounted at the lower end 6a of the mast 6 and configured to recover, or suck, the drilling fluid loaded with drilled material leaving the tube protection 22 when the latter is positioned through the porous layer P of ballast and is detached from the drive head 14.
  • the machine for drilling 1 can comprise suction means (not shown), for example a single pump configured to be connected to the first recovery means 30 and / or to the second recovery means 32 according to the stage of the drilling process.
  • the suction means can comprise a connection means to come to be connected to the first recovery means 30 then to the second recovery means 32.
  • the second recovery means 32 may for example comprise a reservoir in the form of a ring mounted around the protection tube 22, and a circular seal, preferably inflatable, configured to create a seal between the outer wall of the protection tube 22 and the reservoir of the second recovery means 32.
  • the drilling fluid, loaded with drilled material, exiting through the upper end of the protection tube 22 then flows into the reservoir of the second recovery means 32 before being, for example , sucked towards a treatment means (not shown) such as a settling tank making it possible to separate the drilling fluid and the drilled material then to reuse the drilling fluid.
  • a cement grout can then be injected into the drill rod in order to seal the latter in the soil S and thus obtain a catenary pylon micro-pile.
  • a micropile is obtained formed on the one hand by a drill rod and on the other hand by a protective tube which reinforces the retention of the drill rod in the ground.
  • the protection tube is positioned in the ground, through a layer of ballast, without the latter or the surface of the zone to be drilled being impacted by the drilling carried out.
  • the drilling machine 1 is suitable for being installed on a railway wagon and for moving quickly, with significant bends.
  • a work train 34 part of which is illustrated on the figure 5 , comprising a machine for drilling 1 as described above, and making it possible to install the micro-piles of catenary pylons along the railway track on which it runs.
  • the work train 34 can thus comprise, in addition to the machine for drilling 1, means for supplying and circulating, under pressure, a drilling fluid (not shown), connected to the drive head, means Cement grout supplies (not shown) configured to connect to drive head 14 when sealing drill rod 18 in the borehole.
  • the work train 34 may also include suction means 36 for the drilling fluid loaded with drilled material, configured to be connected to the first or to the second recovery means 30, 32, as well as a settling tank 38 mounted downstream of the suction means 36 and allowing separation of the drilling fluid and the drilled material, in order to allow reuse of the drilling fluid.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
EP20179234.8A 2019-06-21 2020-06-10 Maschine zum aufbohren eines mit einer porösen schicht bedeckten bodens, und entsprechendes verfahren Active EP3754154B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1906753A FR3097588B1 (fr) 2019-06-21 2019-06-21 Machine pour forer un sol recouvert d’une couche poreuse, et procédé correspondant

Publications (2)

Publication Number Publication Date
EP3754154A1 true EP3754154A1 (de) 2020-12-23
EP3754154B1 EP3754154B1 (de) 2022-08-10

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ID=67957118

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Application Number Title Priority Date Filing Date
EP20179234.8A Active EP3754154B1 (de) 2019-06-21 2020-06-10 Maschine zum aufbohren eines mit einer porösen schicht bedeckten bodens, und entsprechendes verfahren

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Country Link
EP (1) EP3754154B1 (de)
CA (1) CA3083445A1 (de)
FR (1) FR3097588B1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2869066A1 (fr) * 2004-04-16 2005-10-21 Technip France Sa Methode et ensemble de forage pour forer des trous de large diametre
FR2998593A1 (fr) * 2012-11-29 2014-05-30 Soletanche Freyssinet Procede de mise en place et de scellement d'un element tubulaire dans un sol sous charge d'eau
EP3002371A1 (de) * 2014-10-01 2016-04-06 Soletanche Freyssinet Maschine und verfahren zur erstellung von säulen in einem boden

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2869066A1 (fr) * 2004-04-16 2005-10-21 Technip France Sa Methode et ensemble de forage pour forer des trous de large diametre
FR2998593A1 (fr) * 2012-11-29 2014-05-30 Soletanche Freyssinet Procede de mise en place et de scellement d'un element tubulaire dans un sol sous charge d'eau
EP3002371A1 (de) * 2014-10-01 2016-04-06 Soletanche Freyssinet Maschine und verfahren zur erstellung von säulen in einem boden

Also Published As

Publication number Publication date
EP3754154B1 (de) 2022-08-10
FR3097588B1 (fr) 2022-03-18
FR3097588A1 (fr) 2020-12-25
CA3083445A1 (fr) 2020-12-21

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