DE102014004330A1 - Method and devices for creating a borehole in a ground and simultaneously laying a pipeline in the borehole - Google Patents

Abstract

The invention relates to a method and thereby usable devices for creating a borehole and simultaneously laying a pipeline in a borehole, the pipeline (3) by applying a force from the outside to the pipeline (3) in the axial direction and under hydraulic release of pending Bottom (2) is driven by using at least three nozzles (4) for drilling fluid (5) in a at the front end of the pipe (3) mounted drill head (6), the drilling fluid (5) the nozzles (4) via at least one Supply line (7) is passed through at least one of the nozzles (4) emerges and the dissolved with dissolved soil (2) mixing drilling fluid (5) through the interior of a pipe (3) located drill pipe (8) from the borehole (1) is discharged, a direction control of the propulsion by regulating the respective Bohrflüssigkeitsaustritts done by the nozzles (4) and after reaching a Zielpu (9) through the drill head (6) separating the drill head (6) from the pipe (3) and the drill pipe (8) and the supply lines (7) are pulled out of the pipe (3).

Description

The present invention relates to a method as well as usable devices for creating a borehole in a ground and for the simultaneous laying of a pipeline in the borehole.

Procedures that allow pipelines to be routed into wells are referred to as "trenchless construction." At the present time there are numerous trenchless construction methods such. B. the controlled horizontal drilling technology, the controlled pipe jacking, the Pressbohrverfahren, the pilot pipe method, etc.

A common distinction between the trenchless construction methods is made on the basis of the controllability of the method (controllable or not controllable). In this context, the term "controllability" is understood below to mean the achievement of a horizontally and / or vertically curved bore course (eg "banana-shaped" below a road). This property will also be referred to as "turnability" in the following.

Another distinguishing aspect of trenchless constructions is the handling of the soil in front of the drill bit. While this is displaced in some processes by a conical formation of the drill head in the surrounding soil around the hole (soil displacement), the soil is solved in most processes from the drill head and then transported out of the well (soil degradation).

Further classification options are the achievable geometrical dimensions (length and diameter of the drilled holes or of the pipelines to be laid) as well as the pipe materials (eg steel, concrete, polyethylene, etc.) which can be laid in the respective process.

Finally, a subdivision can be made according to the ground (ground) suitable for the respective method. Rocky ground can z. B. can be solved only by a combination of mechanical and hydraulic drilling activity, while some loosely rock formations (eg., Clay, silt, sand) can be overcome mainly by hydraulic release work (sometimes the corresponding methods are also referred to as "Spülbohrverfahren").

For the present invention, in particular those methods are relevant, which are controllable (curved), carry out the dissolved soil from the borehole, can create boreholes up to a length of about 300 m and a diameter of up to about 300 mm, for the Tubing made of steel and polyethylene come into question and solve the ground for the most part by hydraulic drilling activity.

The above-mentioned criteria are best represented in the state of the art by the "controllable horizontal flush drilling method", as described, for example, in the DVGW regulations "Technische Regel / GW Arbeitsblatt 321" ( ISSN 0176-3512 ) is treated. The workflow of the controllable horizontal Spülbohrverfahrens is usually divided into the three consecutive steps pilot hole, expansion bore (s) and Einziehvorgang.

During the pilot drilling, a drill string composed of individual pipes is successively pushed into the subsoil by a drill rig installed over the surface. By rotating the drill string, a drill bit located at the forward end of the drill string may be positioned with a predetermined working direction (realized, eg, by a control surface or a small bend) so that the drill head will, as a result, drill along a predetermined, e.g. B. banana-shaped drilling line created.

The information about the respective position of the drill head in the ground as well as about the respective orientation of the working direction of the drill head are determined by a measuring probe located immediately behind the drill head and transmitted to overground.

The soil in front of the drill head is, in the case of certain soils (eg clay, silt, sand), loosened mainly hydraulically from the drilling fluid pumped through the drill string to the drill head and then discharged through the annulus between drill string and borehole.

After the drill head has reached the target point of the drill line, it is disassembled from the drill string and instead a so-called reamer attached to the drill string. The reamer is a drilling tool that expands the pilot hole to a larger diameter. This is done by rotating the reamer in rotation and with hydraulic assistance from pumped drilling fluid from the drilling rig through the pilot hole. The soil is in turn degraded hydraulically or hydraulically-mechanically and conveyed through the annulus from the well.

This expansion hole can be repeated with an even larger reamer, usually until the diameter of the hole reaches a value that is approximately 1.2 to 1.5 times larger is like the diameter of the pipeline to be recovered.

In the last step, the (usually in one piece prepared) pipeline is connected to the drill string and then pulled from the drilling rig into the well. For smaller bore dimensions, sometimes also the expansion step and the threading process are summarized, i. H. the pipeline is drawn in during the widening of the pilot hole.

The procedures described have some disadvantages in technical and economic terms. For example, basically two work surfaces are required, one at the entry point of the hole (where the rig will be placed) and one at the target point of the hole (where the tubing will be prepared and laid out). However, this is not possible in many locations or only with great restrictions, for example in urban areas (limited space) or in rural areas, where the access to a site is difficult or cumbersome (eg, if a river is to be drilled and the next bridge is far away).

Furthermore, the three working steps of pilot drilling, expansion bore (s) and retraction process require a relatively long total working time. However, since the stability of a well-borehole-only wellbore declines sharply over time (especially in unstable soils, eg, sand), this results in a relatively large construction risk, in addition to the costs associated with the long total labor time.

Another disadvantage is then to see that extensive equipment for the implementation of the bore are required. Especially for small holes and relatively simple soil are often used for lack of alternatives to large and heavy drilling rigs and drill strings.

In addition, for procedural reasons, there should always be a drill string in the borehole, i. H. it is necessary, for example, to connect another drill string at the target side to the drill string in the borehole during the auger hole (s) for each drill string remote from the rig. For this purpose, appropriate transports from the start to the landing page are required. The associated logistical efforts and costs burden the cost-effectiveness of the process.

The present invention is based on the object to provide a method and thereby usable devices with which a trenchless, curvy laying of pipes up to 300 mm diameter and up to 300 m length in hydraulically detachable floor (eg , Silt, sand) faster, safer and cheaper than can be done in the prior art.

The present invention provides a method of creating a wellbore and laying a pipeline in the wellbore at the same time, with propulsion of the tubing applying an external force to the tubing in the axial direction and hydraulically releasing subsurface soil using at least three nozzles for drilling fluid in a drill head attached to the forward end of the pipeline, wherein the drilling fluid is supplied to the nozzles via at least one supply line, exits through at least one of the nozzles and the dissolved soil mixed drilling fluid exits the wellbore through the interior of a drill pipe located in the conduit is discharged, wherein a direction control of the propulsion by regulating the respective Bohrflüssigkeitsaustritts done by the nozzles, after reaching a target point by the drill head separating the drill head from the pipeline and pulling out of the Bo and the supply lines from the pipeline.

In the method according to the invention, a drill head is first attached to the front end of a pipeline and a drill pipe located in the pipeline. There are supply lines between the pipeline and drill pipe, which are connected on one side (outside the borehole) with at least one pump and at least one regulating unit and on the other side with the drill head.

The drill bit with the connected tubing is then fed to a feed device near the planned entry point of the bore. The feed device then generates and transmits the forces required for the drilling and laying process from the outside to the pipeline.

The pending in front of the drill head soil is mainly solved hydraulically by drilling fluid at the drill head at high pressure escapes. The change in the working direction of the drill head is achieved by targeted opening and closing of nozzles in the drill head, so that the drill head z. B. can also follow a "banana-shaped" bore course.

The drilling fluid is supplied to the nozzles in each case by individual supply lines. These leads are located in the annulus bounded on one side by the outside of the drill pipe and on the other side by the inside of the pipe. The at the drill head before the Drilling fluid jet of the nozzles dissolved and mixed with drilling fluid soil is required by the inside of the drill pipe.

The amount and / or the pressure of the drilling fluid emerging at the individual nozzles can be controlled individually by means of a regulating unit located outside the pipeline and outside the drill pipe. As a result, a targeted change in direction of the drill head and thus a controlled approach even curved borehole sections possible.

To support the discharge of the drilling fluid through the interior of the drill pipe, the invention provides for optimizing this removal in a preferred embodiment by generating a negative pressure in the drill pipe. This can be z. B. by connecting a so-called suction carriage or vacuum car with the end of the drill pipe.

Such Saugwagen are z. B. known from agriculture (so-called "manure barrels"), where a suction pump is connected to a pressure-resistant tank. During operation of the pump, a negative pressure is generated in the tank. A suction hose is connected to the tank. If this suction hose is now held with its unconnected end in a liquid or a bulk material (eg., Sand, cereals) and then opened the slide between the tank and suction hose, then the negative pressure continues into the suction hose and the liquid or the bulk material is sucked in and transported into the tank.

In the method according to the invention can thus be achieved a "closed" circuit of the drilling fluid in which the drilling fluid is fed through the leads to the drill head, there exiting the nozzles, mixed with the upcoming soil and then immediately at the front end of the drill head of the sucked in the drill pipe prevailing vacuum and transported through the drill pipe in a waiting tank.

In order to keep the necessary for the drilling and laying process feed forces in difficult soil low, it is envisaged to wet in a preferred embodiment, the outside of the pipeline with a lubricant (liquid or foam).

For this purpose, at least one lubrication line through the annulus, which is bounded on one side by the outside of the drill pipe and on the other side of the inside of the pipe to the drill head. There, the lubrication line is provided with at least one lubrication opening through which the lubricant can enter into the annular gap between the pipeline and the borehole wall.

As the drilling and laying process progresses, the entire exterior of the pipeline is surrounded with a friction-reducing lubricant.

The drilling and laying process will usually be accomplished with pure water (ie without additives). As a result, a special drilling fluid (eg bentonite-water suspension) can be avoided, resulting in fewer environmental implications and economic benefits to achieve.

In the known drilling and laying method, the drilling fluid used is used not only to release the pending soil, but also to stabilize the surrounding soil and to discharge the dissolved soil.

In the method according to the invention, a hydraulic stabilization of the surrounding soil by drilling fluid is not required, since this support is carried out mechanically through the pipeline to be laid. As a result, ground fault in the drill pipe can be excluded.

In order to achieve an adequate drilling speed in the conventional methods, the amount of supplied drilling fluid must be relatively large, since the discharge capacity of each drilling fluid is limited. As a guideline, it can be assumed that approximately five to ten parts of drilling fluid are required to discharge one part of the soil.

In a preferred embodiment, the method according to the invention works with the assistance of a negative pressure in the delivery line (that is to say the drill pipe). As a result, the amount of drilling fluid can be significantly reduced, for example, to a ratio of one to two or one to three (parts of soil to parts drilling fluid).

The hydraulic release of soil in front of the drill head depends primarily on the pressure that can be used - the higher the pressure, the better the hydraulic dissolving capacity of the applied drilling fluid.

In the previous methods, a combination of relatively large amounts of drilling fluid (> 100 liters per minute) and relatively low pressures (<10 bar) is used for the bore dimensions considered here.

As shown above, the large amount is required for discharging the dissolved soil. Would you handle this large amount with high pressure (For example,> 20 bar), so it would come to involuntary so-called blowouts, ie, the drilling fluid would not take the previously intended way through the annulus between the borehole wall and pipeline, but tear the pending above the ground soil (" fracen ") and flow directly to the terrain surface. This would have a massive negative impact on the environment and significant economic disadvantages.

Another reason for limiting the pressure applied to the nozzles (in the previous methods) is the fact that the compressive strength of the pipes provided for the supply of drilling fluid is limited. In particular, when using PEHD pipes, the corresponding value is often below 10 bar.

Since the method according to the invention provides significantly higher pressures and at the same time low volume flow, supply lines of drilling fluid through high-strength hoses or pipes are required. Such hoses are known from other industries and come z. B. in so-called Kärcher devices used. The allowable pressure level is sometimes well above 150 bar and the usual volume is in the range of 10-20 liters / minute.

The present invention is limited in terms of the materials of the pipeline only in that the pipe must be able to transmit the necessary for propulsion or force in the axial direction of the propulsion device to the drill head without damaging the pipeline or deformed in an undesired or uncontrolled manner would.

The pipeline can be used for laying in one piece or in several pieces z. B. be designed on the terrain surface. This way is particularly suitable for steel pipelines. For bendable pipe materials (such as polyethylene), the pipe can also be held up in a special pipe container and then successively unwound during installation. This considerably reduces the working surface required at the start of the hole.

Because the wellbore is mechanically supported by the tubing itself at any point in the laying operation, the risk of borehole collapse, unlike the prior art, can be eliminated.

The invention also provides a wellhead for establishing a wellbore in a well and simultaneously laying a wellbore in the wellbore, the wellhead configured for attachment to the forward end of the well, and at least three fluid supply wells and at least three fluidity wells at least one measuring probe for determining the position, wherein the supply lines run within the wall of the drill head and the nozzles are designed for a hydraulic release of pending soil.

The probe of the drill head not only allows to determine the position of the drill bit in the ground, but also serves to determine the orientation of the drill bit. If, in use, the drill bit or pipe can twist or twist around the longitudinal axis (so-called "twisting"), it is necessary for proper control of the jacking and its direction if the actual orientation of the drill bit is known. Without knowledge of the orientation, it is not possible to control the direction of propulsion.

The ability to determine the position of the drill head with the aid of the probe allows a comparison between a planned drill line and the actual drill line. Known possibilities for determining the position (eg so-called "walk-over" systems) can be used here.

In one embodiment of the invention, the drill head has at least one further nozzle or nozzle arrangement, the Bohrflüssigkeitsaustritt is not provided for regulation and which is arranged on the front of the drill head and / or pointing inwards / are.

The drill head is characterized in that it has at least three (vorzugswese evenly) distributed on the front side of the drill head nozzles and these nozzles can be individually closed or opened.

The drill head is limited in terms of material design only the restriction that the forces occurring during operation do not lead to its (immediate) damage or failure. The drill head itself does not necessarily transmit forces directly to the working face since the actual excavation is done hydraulically by the drilling fluid and the drill head with the tubing attached thereto is advanced into the space cleared by flushing. Thus, the drill head itself may consist essentially of plastic materials (eg of polyethylene).

In one embodiment, the nozzles of the drill head (possibly with associated supply line and / or control) are exchangeable separately, since different wear situations can occur here.

It is preferred that the nozzles be provided with check valves which prevent entry of drilling fluid or a mixture of excavated soil and drilling fluid into the drill head.

The exit direction of the nozzles can be different. In one embodiment, the exit direction of all nozzles is parallel to the axial direction or longitudinal axis of the drill head. However, it is also possible for the nozzles (in total or else only one or more nozzles from the entirety of the nozzles) to have an outlet direction deviating from the longitudinal axis, in which case the respective outlet direction is preferably directed inwards relative to the longitudinal axis (ie the drilling fluid emerges from the nozzle with a directional portion inward).

In a preferred embodiment, the drill head has at least one lubrication line for the lubricant and at least one lubrication opening, wherein the supply line for the lubricant flows within the wall of the drill head. The lubricating medium exits through the lubricating opening and surrounds the outside of the drill head and the subsequent pipeline with a thin lubricating film.

In a preferred embodiment, the outer diameter of the drill head corresponds to the outer diameter of the pipeline. This ensures that only a minimum required hole volume is created and the retreat - in the case of disasters - as simple and safe as possible.

The supply lines for the transport of the drilling fluid and / or the lubricating medium extend in the region of the pipeline in an annular space bounded on one side by the interior of the pipeline and on the other side by the exterior of the drill pipe.

The control device for controlling the volume flow and / or the pressure of the drilling fluid is located outside the pipeline and outside the drill pipe on the terrain surface.

With the aid of the present invention, pipes up to about 300 mm in diameter and up to about 300 m in length can be trenchless and curved in a predominantly hydraulically detachable soil (eg clay, silt, sand) faster, safer and more cost-effectively than in the prior art be moved.

• – Innerhalb der Rohrleitung sind keine Kabel zur Steuerung der Düsen erforderlich, da die Regulierungsvorrichtung außerhalb der Rohrleitung angeordnet ist.
• – Durch die Kombination aus sehr hohem Druck, geringem Volumenstrom und Unterdruck im Förderrohr werden erheblich kleinere Mengen an Bohrflüssigkeit erforderlich.
• – Durch die rein mechanische Stützung des Bohrkanals kann mit reinem Wasser als Bohrflüssigkeit gearbeitet werden, d. h. es kann eine wirtschaftliche, völlig umweltverträgliche Bohrflüssigkeit eingesetzt werden.
• – Die für die Verlegung vorgesehene Rohrleitung kommt in ihrem Inneren nicht mit Bohrflüssigkeit und/oder gelöstem Boden in Berührung, bleibt somit vollständig sauber und kann damit auch als Wasser- und Gastransportleitung verwendet werden (nicht nur als Abwasserleitung bzw. als Kabelschutzrohr).
• – Da Bohrkopf und Rohrleitung einen sehr ähnlichen bzw. sogar identischen Außendurchmesser aufweisen, kann im Havariefall die Rohrleitung mitsamt Bohrkopf schnell und sicher aus dem Bohrloch zurückgezogen werden.
• – Im Falle einer Verstopfungen des Förderrohrs während des Bohr- und Verlegevorgangs kann diese durch einfache Reinigungsvorgänge (z. B. Spülen mit Wasserschlauch) von außen behoben werden.

As essential advantages of the method according to the invention with the devices which can be used in this case are in particular:

• - No piping to control the nozzles is required inside the piping as the regulator is located outside the piping.
• - The combination of very high pressure, low volume flow and negative pressure in the production pipe requires considerably smaller amounts of drilling fluid.
• - Due to the purely mechanical support of the drilling channel can be used with pure water as a drilling fluid, ie it can be used an economical, completely environmentally friendly drilling fluid.
• - The intended for the installation pipeline does not come in their interior with drilling fluid and / or dissolved soil in contact, thus remains completely clean and can thus be used as a water and gas transport line (not only as a sewer or as a conduit).
• - Since the drill head and pipe have a very similar or even identical outer diameter, the pipeline can be quickly and safely withdrawn from the well in the event of an accident, the pipe together with the drill head.
• - In the case of clogging of the conveyor pipe during the drilling and laying process, this can be remedied from the outside by simple cleaning processes (eg rinsing with water hose).

The drill head according to the invention and the subsequent pipeline are illustrated by means of drawings and explained below, wherein the features shown there have exemplary character.

The drawings show:

1 : Drill Head and Piping - Overview (sections, front view).

2 : Pipeline Cut AA (detail).

3 : Pipe Section BB (detail).

4 : Drill Head and Pipeline Cut CC (detail).

5 : Drilling head section DD (detail).

6 : Drilling head cut EE (detail).

7 : Drilling Head Cut FF (detail).

8th : Drilling head front view (detail).

In 1 is the drill head according to the invention 6 and the subsequent pipeline 3 in a side cut overview as well as in six Cross sections AA to FF and a front view shown.

A pipeline to be laid 3 is with a drill head 6 connected. A drill pipe 8th is inside the pipeline 3 and the drill head 6 and reaches with its centric opening to the front of the drill head 6 ,

Between pipeline 3 and drill pipe 8th be the supply lines 7 from outside the borehole (not shown) to the drill head 6 guided. The supply lines are those for drilling fluid 5 (not shown) or lubricating medium 10 (not shown). The supply lines 7 for drilling fluid 5 (not shown) are with nozzles 4 at the front of the drill head 6 connected. The supply lines 7 for lubricating medium 10 (not shown) are with lubrication openings 11 in the drill head 6 connected.

In the drill head 6 is also a measuring probe 12 arranged, preferably in an externally accessible recess in the drill head 6 ,

In 2 becomes the cross section AA of the pipeline 3 shown in detail.

Around the drill pipe 8th around are leads 7 for drilling fluid 5 and supply lines 7 for lubricating medium 10 arranged. For fixing the supply lines 5 on the drill pipe 8th is a holder 14 intended.

The pipeline 3 completely encloses the components described above. The holder 14 for fixing the supply lines 7 is however only at certain intervals (eg every 2.5 m) on the drill pipe 8th intended.

In 3 becomes the cross section BB of the pipeline 3 shown in detail.

Unlike section AA is in this area of the pipeline 3 no holder 14 for fixing the supply lines 7 provided, ie in this area are the leads 7 "Loose" in the annulus between the pipeline 3 and the drill pipe 8th ,

In 4 becomes the section CC of the drill head 6 and the pipeline 3 shown in detail.

Shown is the connection area of pipeline 3 , Drill head 6 and drill pipe 8th , The supply lines 7 for drilling fluid 5 and the supply lines 7 for lubricating medium 10 are each through holes in the wall of the drill head 6 guided.

In 5 becomes the cross section DD of the drill bit 6 shown in detail.

Shown is the area in the lubrication openings 11 in the drill head 6 are provided. These lubrication openings 11 are with the supply lines 7 for lubricating medium 10 connected, so that through the supply lines 7 pumped lubricating medium 10 through the lubrication holes 11 leak out and around the outside of the pipeline 3 can distribute. Centrally in the middle is the drill pipe 8th arranged. In addition, the supply lines 7 for drilling fluid 5 shown.

In 6 becomes the cross section EE of the drill head 6 shown in detail.

Shown is the area in the drill head 6 in which is the measuring probe 12 in a recess of the wall of the drill head 6 located. This recess is through a cover 15 closed, leaving the probe 12 does not come into direct contact with the borehole. The supply lines 7 for drilling fluid 5 are located in holes in the wall of the drill head 6 , Centrally in the middle is the drill pipe 8th arranged.

In 7 becomes the section FF of the drill bit 6 shown in detail.

Shown is the foremost area in the drill head 6 , in which only the supply lines 7 for drilling fluid 5 each in holes in the wall of the drill head 6 are located. Centrally in the middle is the drill pipe 8th arranged.

In 8th becomes the front view of the drill head 6 shown in detail.

You can see it inside the drill bit 6 Centric drill pipe 8th , At the front of the drill head 6 there are nozzles 4 ,

LIST OF REFERENCE NUMBERS

1

well

2

ground

3

pipeline

4

jet

5

drilling fluid

6

wellhead

7

supply

8th

drill pipe

9

not forgiven

10

lubricating medium

11

lubrication hole

12

probe

13

regulating device

14

bracket

15

cover

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• ISSN 0176-3512 [0008]

Claims (10)

Method for creating a borehole ( 1 ) in a soil ( 2 ) and for the simultaneous laying of a pipeline ( 3 ) in the borehole ( 1 ), with: driving the pipeline ( 3 ) applying an external force to the pipeline ( 3 ) in the axial direction and under hydraulic release of pending soil ( 2 ) using at least three nozzles ( 4 ) for drilling fluid ( 5 ) in one at the front end of the pipeline ( 3 ) mounted drill head ( 6 ), whereby the drilling fluid ( 5 ) the nozzles ( 4 ) in each case via at least one supply line ( 7 ) is supplied through at least one of the nozzles ( 4 ) and those with dissolved soil ( 2 ) mixed drilling fluid ( 5 ) through the interior of one in the pipeline ( 3 ) located drill pipe ( 8th ) from the borehole ( 1 ), wherein a direction control of the propulsion by a regulation of the respective Bohrflüssigkeitsaustritts by the nozzles ( 4 ), after reaching a target point through the drill head ( 6 ) Disconnecting the drill head ( 6 ) from the pipeline ( 3 ) and pulling out the drill pipe ( 8th ) and the supply lines ( 7 ) from the pipeline ( 3 ). The method of claim 1, wherein the regulation of the drilling fluid exit from the nozzles ( 4 ) through at least one, outside the pipeline ( 3 ) ( 13 ) is made. Method according to claim 1 and 2, wherein during the drilling process a negative pressure in the drill pipe ( 8th ) is produced. Method according to claims 1 and 2, wherein a lubricating medium ( 10 ) via at least one supply line ( 7 ) at least one lubricating opening ( 11 ) in the drill head ( 6 ) is supplied. Method according to claims 1 and 2, wherein the drilling fluid ( 5 ) under high pressure (> 10 bar) and low flow rate (<20 liters / minute per nozzle) of at least one nozzle ( 4 ) is supplied. Boring head ( 6 ) for creating a borehole ( 1 ) in a soil ( 2 ) and for the simultaneous laying of a pipeline ( 3 ) in the borehole ( 1 ), wherein the drill head ( 6 ) for attachment to the front end of the pipeline ( 3 ) and at least three supply lines ( 7 ) for drilling fluid ( 5 ) and at least three nozzles ( 4 ) for drilling fluid ( 5 ) and at least one measuring probe ( 12 ) for determining the position, wherein the supply lines ( 7 ) within the wall of the drill head ( 6 ) and the nozzles ( 4 ) to a hydraulic release of pending soil ( 2 ) are configured. Boring head ( 6 ) according to claim 6, wherein the drill head ( 6 ) at least one supply line ( 5 ) for lubricating medium ( 10 ) and at least one lubricating opening ( 11 ) for lubricating medium ( 10 ), wherein the supply line ( 7 ) for the lubricating medium ( 10 ) within the wall of the drill head ( 6 ) runs. Boring head ( 6 ) according to claim 6 and 7, wherein the drill head ( 6 ) has an axially and centrally disposed cavity. Supply lines ( 7 ) according to claims 1 and 6, wherein the supply lines ( 5 ) behind the drill head ( 6 ) are located in an annular space running on one side through the interior of the pipeline ( 3 ) and on the other side through the exterior of the drill pipe ( 8th ) is defined. Regulating device ( 13 ) according to claims 1 and 2, wherein the regulating device ( 13 ) both the flow rate and the pressure of the drilling fluid ( 5 ), whereby the regulation device ( 13 ) outside the pipeline ( 1 ) and the drill pipe ( 8th ) is located on the terrain surface.

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