EP3940192A1 - Procédé de préparation ou de production un forage dans un sol - Google Patents

Procédé de préparation ou de production un forage dans un sol Download PDF

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Publication number
EP3940192A1
EP3940192A1 EP21183182.1A EP21183182A EP3940192A1 EP 3940192 A1 EP3940192 A1 EP 3940192A1 EP 21183182 A EP21183182 A EP 21183182A EP 3940192 A1 EP3940192 A1 EP 3940192A1
Authority
EP
European Patent Office
Prior art keywords
pilot
bore
drill head
agent
soil
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.)
Pending
Application number
EP21183182.1A
Other languages
German (de)
English (en)
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
TPH Bausysteme GmbH
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
Pending legal-status Critical Current

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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
    • E21B7/04—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 bore in a ground according to the preamble of claim 1.
  • the method can be used as a preparation for laying a line in the bore.
  • Horizontal drilling methods are known for laying lines, for example pipelines, empty pipes or electrical lines in the ground, which, instead of a ditch, produce a substantially horizontal borehole for the passage of the lines in the ground.
  • the horizontal directional drilling method which is also known as "Horizontal Directional Drilling" (HDD), is used particularly frequently.
  • a first pilot bore is first made in the ground between a starting point and a target point.
  • a starting pit is made at a starting point and a pilot drilling head was inserted into the ground within this starting pit.
  • a target pit is provided at the intended target point, in which the pilot drilling head exits again.
  • the pilot drill head is preferably arranged on a drill rod which is lengthened in sections and is continuously fed into the borehole during drilling.
  • the course and direction of the pilot hole can be controlled by influencing the pilot drill head. After the pilot hole has been drilled, the pilot drill and drill rods are pulled out of the hole and back to the starting point.
  • the pilot bore can then be widened to a diameter that corresponds to the outside diameter of the line to be laid by clearing it out using a clearing drill.
  • the line to be laid is attached to the drill head and the line is pulled into the widened borehole as the reamer is pulled out.
  • the pilot drill head and/or the reaming drill is retracted that the borehole partially collapses or collapses, for example in the area of sandy or gravel-filled soil sections.
  • the pilot bore is no longer passable due to collapsed borehole sections, the subsequent clearing bore cannot be carried out and the line to be laid cannot be pulled in.
  • DE 198 08 478 C2 also uses the horizontal drilling technique to first create a pilot hole. Once this is completed, a special drilling machine is used, equipped with a scraping disc, cutter wheel or drill head, which can crush larger stones with the help of an integrated crushing tool. The drilling machine is used at the end point of the pilot hole and widens the pilot hole to the required diameter. At the same time, the pipeline to be laid is drawn into the borehole with the drilling machine. Here, too, there is a risk that when the pilot drill is pulled back, the ground will collapse at least in sections due to the geological conditions and the pipeline cannot be pulled in.
  • WO 2015 197 828 A1 is a method for creating a borehole in a ground and for laying a pipeline in the borehole, in which a combination of an outer tube and an inner tube is used, the outer tube and a with the Drill head coupled to the inner tube can be driven separately in order to achieve greater ranges due to better kink resistance.
  • the aim of the invention is to overcome the described disadvantages of the prior art and to create a method with which a bore can be stably drilled through the subsoil, so that in particular a pipeline to be laid can always be laid quickly and reliably in the ground.
  • the subject matter of the invention is also the use of a solidifying agent discharged into the surrounding soil of a pilot borehole produced by a horizontal drilling method for the purpose of solidifying a pilot borehole according to claim 14.
  • An embodiment is the subject matter of claim 15.
  • a method for producing a bore in a ground for laying a line in the bore is proposed, that the steps of arranging a drill pipe arranged on a pilot drill head at a starting point in the ground, driving and guiding the pilot drill head in the ground on a predefined path from the starting point to an ending point to produce a pilot hole, and retracting the drill string to the starting point.
  • the step of guiding an injection tool through the pilot bore, coupled with a movement of the pilot drill head or the drill rod is provided, which at least partially applies a consolidation agent to the adjoining soil for consolidation of the soil.
  • the solidifying agent can be pressed more or less deeply into the soil surrounding the borehole. Injection materials that harden after injection are used as solidifying agents.
  • 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. As an alternative or in addition to this, hitting the pilot drilling head is also conceivable.
  • Known sensors can be used to determine the current position of the pilot drill head and influence the corresponding control of the drilling mechanism in order to follow the predefined path to follow. Consequently, the method according to the invention begins with a controllable horizontal drilling method for producing 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 the drill rods. This means that when the drill rods of the pilot drill head are still in the pilot drill hole, the injection tool is guided in the pilot drill hole. It is initially irrelevant how the injection tool is coupled to the movement of the pilot drill head or the drill rods.
  • the injection tool can be attached to the drill string or pilot drill bit. As an alternative to this, it could also already be arranged on the drill string behind the pilot drill head. Due to the coupled guidance, the solidifying agent can be applied in situ immediately after the progressive production of the well.
  • an aqueous bentonite or cement suspension a reaction resin that hardens by polymerisation (chemically hardening adhesive) or a physically setting adhesive (e.g. solvent-based adhesives) is used as the strengthening agent.
  • Polymerization as a generic term here includes polyaddition, polycondensation and free-radical polymerization, i.e. a reaction resin that hardens by polyaddition, polycondensation or free-radical polymerization can be used as the reaction resin.
  • a reaction mass based on acrylate or silicate resin or a reaction mass based on polyurethane is preferably applied as a solidifying agent in the vicinity of the drilled hole.
  • the injection tool is coupled to the pilot drill head at the end point or, optionally after decoupling the pilot drill head, to the drill pipe and selectively discharges the solidifying agent when the drill pipe is pulled back to the starting point.
  • the pilot drill head is driven completely through the ground to the intended end point and then projects out of the second pit located there at the end point.
  • the injection tool can then subsequently be connected to the pilot drill head or, after decoupling the pilot drill head, can be connected directly to the drill string. It might be advisable to make a non-rotatable connection with the pilot drill head so that the injection tool does not twist.
  • the injection tool could be moved with the pilot drilling head when the pilot bore is being made, and the solidifying agent could be selectively discharged in the process.
  • the injection tool could also already be arranged behind the pilot drilling head and be guided through the already existing section of the pilot drilling directly when the pilot drilling is being made. It is conceivable that the injection tool will then already carry out a consolidation of the soil where necessary when creating the pilot bore.
  • the solidification agent is injected radially (with respect to the central axis of the bore) from the injection tool onto the surrounding soil.
  • the application can be distributed around the entire circumference so that a closed, tube-like shell of solidification agent is formed.
  • the application can be selective only in a desired area of the circumference, so that for example only a half-shell or another segment of a shell of consolidating agent is formed if only there the consolidation of the soil around the well is desired.
  • the injection tool can consequently have nozzles, openings and/or slots which are distributed around the circumference of the injection tool and through which the consolidating agent is applied radially to the surrounding soil.
  • the drill string may provide the necessary tubing for the consolidant and others.
  • the injection tool can have a line running close to or through the pilot drill head, with which consolidating agent can be injected into a zone lying in the drilling direction in front of the pilot drill head.
  • injections of solidifying agent into the borehole environment which take place in relation to the production of the borehole after, in parallel or in advance.
  • the injection is referred to as trailing if the injection tool follows the pilot drill head at some distance or is only pulled through the drilled hole when the drill rod is pulled back;
  • Such a procedure can be used if the soil surrounding the bore has a certain basic strength, so that it can be assumed that the bore has at least one some time until the injection tool is fed through the hole is stable.
  • Simultaneous or parallel injection is considered to be injection made by an injection tool immediately following or a very short distance behind the tip of the pilot drill bit and injecting consolidating agent into the straight hole area being drilled.
  • the injection direction is primarily radial, ie the solidifying agent is pressed perpendicularly to the drilling direction and 360° around the axis of the drilling direction into the soil surrounding the drilling.
  • this is practically already stabilized by hardening solidifying agent when a longitudinal section of the bore is being produced.
  • consolidating agent is pressed into the area in front of the pilot drill head in the drilling direction, thereby stabilizing the soil in the area of the borehole with hardened consolidating agent even before it is drilled.
  • such a procedure is required in the case of very loose areas where a drilled hole would otherwise be buried again immediately or after a short time.
  • the injection tool may have lines or lances which are positioned at least temporarily so that they pass close to or through the pilot drill head and have their injection opening directed towards the area in front of the pilot drill head. It is also possible to combine several of the three injection methods described.
  • the course of hardening of the consolidating agent over time must be adapted to the movement of the injection tool through the bore through its chemical formulation in such a way that the injection tool has already left an area into which the consolidating agent has been injected before the consolidating agent has completely hardened is. This can prevent hardened hardening material from hardening on the injection tool and being pulled along with it.
  • the strength of the soil could be analyzed before or during the drilling of the pilot hole.
  • the analysis could be carried out by externally placed probes in the ground.
  • a sensor system could be provided which allows the soil to be examined directly inside the pilot borehole when the pilot borehole is being made or immediately thereafter.
  • the condition of the washed out material could be examined to analyze the strength of the soil. Consequently, the condition of the soil in particular is continuously examined to assess its strength.
  • the injection tool could discharge the consolidant in areas of the pilot hole where the strength is below a desired minimum strength.
  • the areas in which the strength of the soil is not sufficient to ensure the stability of the pilot bore could be stored electronically, for example, so that they can then be solidified one after the other, controlled by a control unit.
  • At least a partial area, i.e. a longitudinal section, of the pilot borehole is separated from adjacent areas and the consolidating agent is discharged exclusively in the partial area for consolidating the soil. This allows the solidifying agent to be discharged by means of an overpressure in the corresponding sub-area, so that individual sub-areas can be solidified efficiently and the solidifying agent does not flow into adjacent areas of the pilot bore.
  • partial areas of the pilot bore are solidified.
  • the partial areas could lie next to one another or be spaced apart from one another. It may be advisable to always provide two opposing axial boundaries of a sub-area with a constant distance in order to strengthen larger areas, for example by treating several small sub-areas with fixed dimensions in succession. This limits the size of the injection tool and constant flow conditions can always be guaranteed in the limited sub-areas.
  • sealing elements that are spaced apart from one another along the pilot bore to separate a respective partial region and to contract after the solidifying agent has been discharged.
  • the sealing elements could be, for example, fluid-inflatable annular cushion-like devices that can be selectively expanded and contracted. Using a soft, elastic material allows for a good seal against the ground.
  • the partial area containing the strengthening agent could be compressed radially by means of the sealing elements. It might be advisable to use these sealing elements to partially compress the soil radially in order to achieve particularly good consolidation.
  • the invention further relates to the use of a solidifying agent discharged into the surrounding soil of a pilot bore hole produced by a horizontal drilling method for solidifying a pilot bore hole.
  • the solidifying agent could be discharged in situ when the pilot bore is made or when a pilot drill head is withdrawn.
  • In 1 shows a schematic cross section through an underground area through which a horizontal drilling machine 6 has created a pilot hole 8 .
  • This extends from a starting point 1 in front of the horizontal boring machine 6 to an end point 5.
  • a pilot boring head 2 on a boring bar 3 can be guided through the ground on a desired path.
  • the pilot bore 8 leads, for example, through a soil area 10 with loosened soil.
  • the pilot drill head 2 protrudes at the end point 5 from the ground.
  • the drill string extends through the entire pilot hole 8, thereby preventing the collapse of the adjacent soil.
  • An injection tool 4 is now coupled to the pilot drilling head 2; alternatively, the pilot drill head 2 dated Drill string to be uncoupled and as in 2 shown an injection tool 4 are coupled directly to the drill string 3.
  • the injection tool 4 is in 2 shown schematically as a cylindrical body having an internal cavity communicating with a series of injection ports 9 on the surface of the injection tool 4.
  • the injection openings 9 are preferably distributed around the circumference of the injection tool 4 and are intended to be able to release a solidifying agent.
  • the drill rod 3 is pulled back through the pilot bore 8 with the injection tool 4 arranged thereon, with the solidifying agent being released at least in certain areas during the pulling back where it is needed.
  • the solidifying agent is pressed under pressure into the injection tool 4 and is thereby pressed out of its injection openings 9 into the surrounding soil. This will in 3 shown. If the injection openings 9 are correspondingly distributed around the circumference of the injection tool 4, a closed, tubular shell is thereby produced from the solidification agent. After the injection tool 4 has passed the loosened area 10, which is now stabilized by solidifying solidifying agent, the injection tool 4 can again stop dispensing solidifying agent. After the drill rod 3 has been completely pulled out with the injection tool 4, the pilot hole 8 is present. This can be reamed to create a larger diameter hole that is used to route cables.
  • a pilot drill head 2 is arranged on a drill rod 3 at a starting point 1 in the ground 7 12.
  • the pilot drill head 2 is then placed in the ground 7 on a predefined path from the starting point 1 to an end point 5 for producing a pilot hole 8 out and driven 13.
  • the pilot drill head 2 or the drill string 3 is coupled to an injection tool 4 and the injection tool 4 is guided through the pilot hole. This can be done when the drill string 3 is pulled back 15 to the starting point 1 .
  • a solidifying agent is applied 16 to the adjoining soil 7 to solidify the soil 7. In this case, sealing elements could separate 18 partial regions into which the solidifying agent is introduced.
  • the strength of the soil can be analyzed before or during the drilling of the pilot hole 17. This could, for example, be Investigate washed out material.
  • the pilot hole 8 can be broached 19 in order to pull in a line.

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)
EP21183182.1A 2020-07-17 2021-07-01 Procédé de préparation ou de production un forage dans un sol Pending EP3940192A1 (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 (1)

Publication Number Publication Date
EP3940192A1 true EP3940192A1 (fr) 2022-01-19

Family

ID=76744722

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21183182.1A Pending EP3940192A1 (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) EP3940192A1 (fr)
DE (1) DE102020119032A1 (fr)

Citations (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
EP2863003A2 (fr) 2013-10-15 2015-04-22 TERRA AG für Tiefbautecknik Outil et dispositif d'agrandissement d'un passage existant dans le sol
WO2015197828A1 (fr) 2014-06-27 2015-12-30 Kögler Rüdiger Procédé et dispositif pour réaliser un trou de forage
CN108060908A (zh) * 2017-11-14 2018-05-22 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

Patent Citations (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
EP2863003A2 (fr) 2013-10-15 2015-04-22 TERRA AG für Tiefbautecknik Outil et dispositif d'agrandissement d'un passage existant dans le sol
WO2015197828A1 (fr) 2014-06-27 2015-12-30 Kögler Rüdiger Procédé et dispositif pour réaliser un trou de forage
CN108060908A (zh) * 2017-11-14 2018-05-22 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

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DE102020119032A1 (de) 2022-01-20

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