EP3940192B1 - Procédé de préparation ou de production un forage dans un sol - Google Patents

Procédé de préparation ou de production un forage dans un sol

Info

Publication number
EP3940192B1
EP3940192B1 EP21183182.1A EP21183182A EP3940192B1 EP 3940192 B1 EP3940192 B1 EP 3940192B1 EP 21183182 A EP21183182 A EP 21183182A EP 3940192 B1 EP3940192 B1 EP 3940192B1
Authority
EP
European Patent Office
Prior art keywords
pilot
ground
bore
injection tool
consolidating agent
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.)
Active
Application number
EP21183182.1A
Other languages
German (de)
English (en)
Other versions
EP3940192A1 (fr
EP3940192C0 (fr
Inventor
Christian Wild
Götz Tintelnot
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.)
Max Wild GmbH
Sika Technology AG
Original Assignee
Max Wild GmbH
TPH Bausysteme GmbH
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 Max Wild GmbH, TPH Bausysteme GmbH filed Critical Max Wild GmbH
Publication of EP3940192A1 publication Critical patent/EP3940192A1/fr
Application granted granted Critical
Publication of EP3940192B1 publication Critical patent/EP3940192B1/fr
Publication of EP3940192C0 publication Critical patent/EP3940192C0/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • E21B7/04—Directional drilling
    • E21B7/046—Directional drilling horizontal drilling
    • 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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
    • E21B33/138—Plastering the borehole wall; Injecting into the formation
    • 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
    • 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
    • E21B7/28—Enlarging drilled holes, e.g. by counterboring

Definitions

  • the invention relates to a method for preparing or producing a borehole in a ground according to the preamble of claim 1.
  • the method can be used as preparation for laying a line in the borehole.
  • Horizontal drilling methods are commonly used for laying cables, such as pipelines, conduits, or electrical lines, underground. Instead of digging a trench, they create a substantially horizontal borehole for the cables to pass through.
  • the horizontal directional drilling (HDD) method is particularly frequently used.
  • an initial pilot bore is first drilled between a starting point and a target point.
  • a starting pit is created at a starting point, and a pilot drill bit is inserted into the ground within this starting pit.
  • a target pit is provided at the designated target point, into which the pilot drill bit exits.
  • the pilot drill head is preferably mounted on a drill rod, which is extended in sections and continuously guided into the borehole during drilling.
  • the course and direction of the pilot hole can be controlled by influencing the pilot drill head. After drilling the pilot hole, the pilot drill and the drill rod are retracted from the borehole and returned to the starting point.
  • the pilot hole can then be widened to a diameter corresponding to the outer diameter of the pipe to be installed using a reamer.
  • the pipe to be installed is attached to the drill head, and the pipe is pulled into the widened hole as the reamer is withdrawn.
  • the borehole may partially collapse or collapse during retraction of the pilot drill head and/or the reamer, for example, in sandy or gravel-filled soil sections.
  • the pilot borehole is already blocked due to collapsed sections of the borehole, the subsequent reamer drilling cannot be carried out, and the pipeline to be laid cannot be pulled in.
  • DE 198 08 478 C2 also uses horizontal drilling technology to first create a pilot bore. Once this is completed, a special drilling machine is deployed. This machine is equipped with a cutting disc, a cutting wheel, or a drill head and can crush larger stones with the help of an integrated crushing tool. The drilling machine is inserted at the end point of the pilot bore and expands the pilot bore to the required diameter. At the same time, the drilling machine pulls the pipeline to be laid into the borehole. Here, too, there is a risk that when the pilot drill is withdrawn, the ground will collapse at least in part due to the geological conditions, preventing the pipeline from being pulled in.
  • US 2010/181110 A1 describes a process in which a consolidation fluid is introduced into a borehole.
  • EP 2 447 462 A1 describes a method for underground installation of a pipeline between a home page and a target page.
  • DE 197 29 809 C1 describes a drilling device with a pilot drill head that has outlet openings for a stiffening drilling suspension.
  • the aim of the invention is to overcome the described disadvantages of the prior art and to create a method with which a bore through the subsoil can be produced in a stable manner, so that in particular a pipeline to be laid can always be laid quickly and reliably in the ground.
  • a method for creating a borehole in the ground for laying a pipeline in the borehole comprising the steps of arranging a pilot drill head arranged on a drill rod at a starting point in the ground, driving and guiding the pilot drill head in the ground along a predefined path from the starting point to an end point to create a pilot borehole, and retracting the drill rod to the starting point.
  • the step of guiding an injection tool through the pilot borehole, coupled to a movement of the pilot drill head or the drill rod is provided. This injection tool applies a solidifying agent to the adjacent ground in certain regions to solidify the ground.
  • the pilot drill head is driven completely through the ground to the end point, and the injection tool is subsequently coupled to the pilot drill head or the drill rod at the end point, and upon retracting the drill rod to the starting point, the injection tool selectively applies the solidifying agent only to certain regions in the pilot borehole.
  • the consolidation agent can be pressed deeper or deeper into the soil surrounding the borehole.
  • Injection materials are used as consolidation agents, which harden after injection.
  • the starting point could be located in a first pit, as mentioned above.
  • the pilot drill head can be driven through the ground, in particular by a rotary drive. Alternatively or additionally, impacting the pilot drill head is also conceivable.
  • Known sensor technology can be used to determine the current position of the pilot drill head and influence the corresponding control of the drilling mechanism to follow the predefined path.
  • the method according to the invention therefore begins with a controllable horizontal drilling process for creating a continuous pilot bore between the starting point and the end point.
  • the pilot bore is stabilized by an injection tool that is guided through the pilot bore.
  • the injection tool is guided in conjunction with a movement of the pilot drill head or drill rod. This means that while the drill rod of the pilot drill head is still in the pilot bore, the injection tool is guided in the pilot bore.
  • an aqueous bentonite or cement suspension, a polymerization-curing reactive resin (chemically curing adhesive), or a physically curing adhesive (e.g., solvent-based adhesives) is used as the solidifying agent.
  • Polymerization as a generic term, encompasses polyaddition, polycondensation, and radical polymerization, i.e., a reactive resin that cures by polyaddition, polycondensation, or radical polymerization can be used as the solidifying agent.
  • a reaction compound based on acrylate or silicate resin, or a reaction compound based on polyurethane is applied to the area surrounding the drilled borehole.
  • the injection tool is intended to be coupled to the pilot drill head at the end point or, if necessary after detaching the pilot drill head, to the drill rod.
  • the injection tool selectively applies the stabilizing agent. Consequently, the pilot drill head is driven completely through the ground to the intended end point and then protrudes from the second pit located there.
  • the injection tool can then be connected to the pilot drill head or, after detaching the pilot drill head, directly to the drill rod. In this case, a non-rotational connection to the pilot drill head can be provided so that the injection tool does not twist.
  • the consolidation agent is sprayed radially (relative to the center axis of the borehole) from the injection tool onto the surrounding soil.
  • the application can be distributed around the entire circumference, forming a closed, tubular shell of consolidation agent.
  • the application can be selectively limited to a desired area of the circumference, e.g., forming only a half-shell or another segment of a shell of consolidation agent if consolidation of the soil around the borehole is desired only there.
  • the injection tool can thus comprise nozzles, openings, and/or slots distributed around the circumference of the injection tool, through which the consolidation agent is applied radially to the surrounding soil.
  • the drill string can provide the necessary conduits for the consolidation agent and other means.
  • the injection tool can be equipped with a line running close to or through the pilot drill bit, allowing the stabilizing agent to be injected into a zone located in front of the pilot drill bit in the direction of drilling.
  • the injection direction is primarily radial, i.e. Solidification agent is pressed into the soil surrounding the borehole perpendicular to the drilling direction and circulating 360° around the axis of the drilling direction.
  • Solidification agent is pressed into the soil surrounding the borehole perpendicular to the drilling direction and circulating 360° around the axis of the drilling direction.
  • the borehole is stabilized by hardening solidification agent almost as soon as it is created.
  • solidification agent is pressed into the area in front of the pilot drill bit in the drilling direction, thus stabilizing the soil in the borehole area with hardened solidification agent even before the borehole is created.
  • such a procedure is recommended in very loose areas where a drilled borehole would otherwise be filled immediately or after a short time.
  • the injection tool can have lines or lances that are at least temporarily positioned so that they run close to or through the pilot drill bit and are directed with their injection opening towards the area in front of the pilot drill bit.
  • the chemical formulation of the hardening agent must be adapted to the movement of the injection tool through the borehole so that the injection tool has already left the area where the hardening agent has been injected before the hardening agent has completely hardened. This prevents the hardened hardening material from hardening on the injection tool and being pulled along with it.
  • the soil strength could be analyzed before or during the pilot borehole drilling. This analysis could be performed using probes inserted into the soil from outside. Alternatively, a sensor system could be installed directly inside the pilot borehole, allowing the soil to be examined during or immediately after the drilling.
  • the quality of the excavated material could be examined to analyze the soil's strength. Consequently, the soil's quality is continuously examined to assess its strength.
  • the injection tool could discharge the strengthening agent into areas of the pilot hole where the strength is below a desired minimum strength. Areas where the strength of the soil is not sufficient to ensure the stability of the pilot bore could, for example, be stored electronically so that they can then be consolidated one after the other under the control of a control unit.
  • At least one section, i.e., a lengthwise portion, of the pilot bore is separated from adjacent sections, and the stabilizing agent is discharged exclusively in the section intended to stabilize the soil. This allows the stabilizing agent to be discharged by means of overpressure in the corresponding section, so that individual sections can be efficiently stabilized and the stabilizing agent does not flow into adjacent sections of the pilot bore.
  • sections of the pilot bore are consolidated.
  • the sections could, for example, be adjacent to one another or spaced apart. It may be advisable to provide two opposing axial boundaries of a section at a constant distance, allowing larger sections to be consolidated, for example, by sequentially treating several smaller sections with fixed dimensions. This limits the size of the injection tool, and consistent flow conditions can be guaranteed in the defined sections.
  • sealing elements could be, for example, fluid-inflatable, ring-shaped, cushion-like devices that can be selectively expanded and contracted.
  • the use of a soft, elastic material allows for a good seal against the ground.
  • the section containing the strengthening agent could be radially compressed using the sealing elements. It might be advisable to partially compress the soil radially using these sealing elements to achieve particularly good consolidation.
  • pilot hole can be reamed and the pipe pulled in. This completes the installation of the pipe through the hole in the ground.
  • the invention further relates to the use of a consolidation agent discharged into the surrounding soil of a pilot borehole produced by a horizontal drilling method for consolidating a pilot borehole.
  • the hardening agent could be discharged in situ during the creation of the pilot hole or during the retraction of a pilot drill head.
  • FIG. 1 A schematic cross-section through an underground area is shown, through which a horizontal drilling machine 6 has created a pilot bore 8. This extends from a starting point 1 in front of the horizontal drilling machine 6 to an end point 5.
  • a pilot drill head 2 can be guided through the ground on a drill rod 3 along a desired path.
  • the pilot bore 8 leads, for example, through a ground area 10 with loosened soil.
  • the pilot drill head 2 protrudes from the ground at the end point 5.
  • the drill rod extends through the entire pilot bore 8 and prevents the adjacent soil from collapsing.
  • An injection tool 4 is then coupled to the pilot drill head 2; alternatively, the Pilot drill head 2 is to be disconnected from the drill string and as shown in Fig. 2 As shown, an injection tool 4 can be coupled directly to the drill rod 3.
  • the injection tool 4 is in Fig. 2 schematically depicted as a cylindrical body having an internal cavity communicating with a series of injection openings 9 on the surface of the injection tool 4.
  • the injection openings 9 are preferably arranged distributed around the circumference of the injection tool 4 and are designed to be able to deliver a solidifying agent.
  • the drill rod 3, with the injection tool 4 arranged thereon, is retracted through the pilot bore 8, with the solidifying agent being delivered in certain areas where it is needed during the retraction.
  • the solidifying agent is pressed under pressure into the injection tool 4 and thereby pressed out of its injection openings 9 into the surrounding soil.
  • Fig. 3 shown.
  • the injection openings 9 are distributed accordingly around the circumference of the injection tool 4, a closed, tubular shell of the solidifying agent is created.
  • the application of solidifying agent by the injection tool 4 can be stopped.
  • the pilot bore 8 is created. This can be expanded to create a bore of larger diameter, which is used for laying cables.
  • Fig. 4 shows, in block-based representation, the sequence of a method 11 according to the invention.
  • a pilot drill head 2 is arranged 12 on a drill rod 3 at a starting point 1 in the ground 7.
  • the pilot drill head 2 is guided and driven 13 in the ground 7 on a predefined path from the starting point 1 to an end point 5 to create a pilot bore 8.
  • the pilot drill head 2 or the drill rod 3 is coupled to an injection tool 4, and the injection tool 4 is guided through the pilot bore. This occurs when the drill rod 3 is retracted 15 to the starting point 1 .
  • a stabilizing agent is applied to the adjacent soil 7 in certain areas to stabilize the soil 7. Sealing elements could separate partial areas 18 into which the stabilizing agent is applied.
  • the strength of the soil can be analyzed before or during the creation of the pilot bore 17. This This could, for example, include examining the leached material. After the pilot bore 8 has been drilled, the pilot bore 8 can be cleared 19 to install a pipe.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (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)
  • Mechanical Engineering (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Claims (11)

  1. Procédé (11) pour préparer ou réaliser un forage dans un sol (7) afin de poser une conduite dans le forage, comprenant les étapes suivantes :
    disposition (12) d'une tête de forage pilote (2) disposée sur une tige de forage (3) à un point de départ (1) dans le sol (7),
    entraînement et guidage (13) de la tête de forage pilote (2) dans le sol (7) sur une trajectoire prédéfinie allant du point de départ (1) à un point d'arrivée (5) afin de réaliser un forage pilote (8),
    rétraction (15) de la tige de forage (3) jusqu'au point de départ (1),
    et l'étape du guidage (14), couplé à un mouvement de la tête de forage pilote (2) ou de la tige de forage (3), d'un outil d'injection (4) à travers le forage pilote (8), lequel applique (16) par zones un agent de consolidation dans le sol adjacent (7) afin de consolider le sol (7),
    la tête de forage pilote (2) étant entraînée à travers le sol complètement jusqu'au point final (5) et l'outil d'injection (4) étant ensuite, au point final (5), couplé à la tête de forage pilote (2) ou à la tige de forage (3) et, lors de la rétraction de la tige de forage (3) vers le point de départ (1), appliquant (16) l'agent de consolidation de manière sélective uniquement dans certaines zones dans le forage pilote.
  2. Procédé (11) selon la revendication 1, caractérisé en ce que l'agent de consolidation utilisé est une suspension aqueuse de bentonite ou de ciment, une résine réactive durcissant par polymérisation ou un adhésif à prise physique ou des mélanges des composés précités, de préférence une résine réactive à base d'acrylate ou de silicate ou une résine réactive à base de polyuréthane.
  3. Procédé (11) selon l'une des revendications précédentes, caractérisé en ce que l'agent de consolidation est pulvérisé radialement à partir de l'outil d'injection (4) sur le sol environnant (7).
  4. Procédé (11) selon l'une des revendications précédentes, caractérisé en ce que la solidité du sol (7) est analysée (17) avant ou pendant la réalisation du forage pilote (8).
  5. Procédé (11) selon la revendication 4, caractérisé en ce que, lors de la réalisation du forage pilote (8), la nature du matériau dégorgé est examinée afin d'analyser (17) la solidité du sol (7).
  6. Procédé (11) selon la revendication 4 ou 5, caractérisé en ce que l'outil d'injection (4) évacue (16) l'agent de consolidation dans des zones (10) du forage pilote (8) dans lesquelles la solidité est inférieure à une solidité minimale souhaitée.
  7. Procédé (11) selon l'une des revendications précédentes, caractérisé en ce que, lors de l'évacuation de l'agent de consolidation, au moins une zone partielle du forage pilote (8) est séparée (18) des zones voisines et l'agent de consolidation est évacué (16) exclusivement dans cette zone partielle afin de consolider le sol (7).
  8. Procédé (11) selon la revendication 7, caractérisé en ce que plusieurs zones partielles du forage pilote (8) sont consolidées.
  9. Procédé (11) selon la revendication 7 ou 8, caractérisé en ce que deux éléments d'étanchéité espacés l'un de l'autre le long du forage pilote (8) sont expansés en vue séparer une zone partielle respective et sont contractés après évacuation de l'agent de consolidation.
  10. Procédé (11) selon la revendication 9, caractérisé en ce qu'après la contraction de la zone partielle comportant le moyen de consolidation, celle-ci est pressée radialement au moyen des éléments d'étanchéité.
  11. Procédé (11) selon l'une des revendications précédentes, caractérisé en ce qu'après la rétraction complète de la tête de forage pilote (2) et de la tige de forage (3), un déblaiement du forage pilote (8) et une insertion de la conduite sont effectués.
EP21183182.1A 2020-07-17 2021-07-01 Procédé de préparation ou de production un forage dans un sol Active EP3940192B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020119032.8A DE102020119032A1 (de) 2020-07-17 2020-07-17 Verfahren zum Vorbereiten oder Herstellen einer Bohrung in einem Boden

Publications (3)

Publication Number Publication Date
EP3940192A1 EP3940192A1 (fr) 2022-01-19
EP3940192B1 true EP3940192B1 (fr) 2025-09-03
EP3940192C0 EP3940192C0 (fr) 2025-09-03

Family

ID=76744722

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21183182.1A Active EP3940192B1 (fr) 2020-07-17 2021-07-01 Procédé de préparation ou de production un forage dans un sol

Country Status (2)

Country Link
EP (1) EP3940192B1 (fr)
DE (1) DE102020119032A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116291488A (zh) * 2023-04-04 2023-06-23 湖南大学 基于双机联动的曲线钻进全方位高压旋喷注浆系统及方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19729809C1 (de) 1997-07-11 1998-12-17 Flowtex Technologie Import Von Vorrichtung und Verfahren zum Herstellen von Bohrlochverzweigungen
DE19808478C2 (de) 1998-03-02 2000-10-26 Ruediger Koegler Verfahren zum grabenlosen Verlegen von Rohren
US20100181110A1 (en) 2009-01-20 2010-07-22 Harr Robert E Green directional drilling fluid composition
EP2447462A1 (fr) * 2010-10-29 2012-05-02 T.I.C. Technology Innovation Consulting AG Procédé d'introduction souterraine d'une conduite
DE102013111350A1 (de) 2013-10-15 2015-04-16 TERRA AG für Tiefbautechnik Aufweitwerkzeug und Vorrichtung zum Aufweiten einer im Erdreich vorhandenen Durchgangsöffnung
DE102014009630A1 (de) 2014-06-27 2015-12-31 Rüdiger Kögler Verfahren und Vorrichtung zur Erstellung eines Bohrlochs
CN108060908B (zh) * 2017-11-14 2020-04-07 北京中煤矿山工程有限公司 建筑群下富水砂层长距离水平定向钻孔注浆加固工艺

Also Published As

Publication number Publication date
EP3940192A1 (fr) 2022-01-19
DE102020119032A1 (de) 2022-01-20
EP3940192C0 (fr) 2025-09-03

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