EP2900895B1 - Device and method for laying a pipeline in a borehole - Google Patents

Description

The present invention relates to a device for laying a pipeline in a borehole and a corresponding method.

In the past, numerous methods and devices have been developed for laying pipelines in boreholes in the ground and thus traversing sensitive areas on the terrain surface for which laying in an open trench for technical, environmental, legal and / or economic reasons is not possible or is desired. Such a trenchless laying can be particularly useful where the surface in the laying area with heavy construction machinery can not be driven (eg bogs, waters) or where from an ecological point of view, no planning permission can be granted (eg in nature reserves) or where the use of conventional laying techniques expensive (eg crossing waterways or railway lines).

WO 2012/095472 relates to a system and method for radially expanding a tubular member. The method includes the steps of bending the tubular member radially outward and in an axially reverse direction to form a flared tubular portion that extends around an unexpanded tubular portion, wherein the bending occurs in a bending zone; Increasing the length of the flared tubular portion by advancing the unexpanded tube portion in the axial direction relative to the flared tubular portion; Operating a drill string extending through the unexpanded tubular portion and provided with a drill at a borehole end to drill a borehole; and operating a directional drilling apparatus connected to the drill string to control the borehole along a predetermined path.

DE 20 2012 004 882 U1 discloses a tube guide means for guiding a tube to be inserted into a substrate, comprising a main frame for holding the components of the tube guide means and at least two guide elements for engaging and guiding a tube, said at least two guide elements define a passage opening, wherein the passage opening has an axial axis has, corresponding to an axial direction of the tube, characterized in that the pipe guiding device further comprises an auxiliary frame, wherein the at least two guide elements are mounted on the auxiliary frame, wherein the auxiliary frame is attached to the main frame and wherein the auxiliary frame in relation to the main frame around a axial axis is rotatable.

At an in DE 39 02 868 C1 described method for creating a circumferentially stiffened, mainly horizontally oriented borehole in ground formations, the borehole is driven by means of a Richtbohrwerkzeugs and this tracked a jacket tube. In this case, the jacket tube is advanced simultaneously and uniformly with the directional drilling tool and aligned the front end of the jacket tube through the front part of the directional drilling tool.

Among the well-known trenchless piping techniques currently in use are Horizontal Directional Drilling (HDD) and controlled pipe jacking (Microtunneling, MT).

The HDD process is done in three steps. First, a controlled pilot hole is driven from the starting point to the target point of a hole. thereupon This pilot hole is widened in quasi "reverse" in one or more steps to such a large diameter that the pipe provided for laying in the last step can then be drawn into the expanded hole. The pull-in is usually also "backwards" from the destination to the starting point. Due to the process, large work surfaces are required both at the start and at the destination.

With the HDD process, pipelines from approx. 50 mm to approx. 1,400 mm in diameter and lengths of approx. 50 m to more than 3,000 m can be laid.

Disadvantages of the HDD method are the need for large work surfaces both at the start and at the destination and in the associated with the large number of steps time.

In contrast, the MT method allows the single-phase installation of a pipeline, since a borehole is created at the same time and the pipeline composed of individual pipes is successively laid therein.

A disadvantage of the MT method, however, is the low range with small pipe diameters. For the relevant diameter range of approx. 100 mm to approx. 500 mm, the achievable bore length for the MT process is only approx. 50 m to approx. 150 m. Among other things, this is due to the fact that the supply of primary energy according to the rules of the art is hydraulic. However, because of the small diameter no hydraulic units can be positioned in the drill head, the pressurized hydraulic oil must be supplied from outside via hose lines. The resulting power losses are immense and thus limit the achievable bore lengths.

Another disadvantage of the MT method is the fact that the specific type of control of MT drill heads requires at least one seal per control joint is. Due to their design, these are only designed for pressure ranges up to approx. 3.5 bar. Higher compressive strengths can be achieved only with great effort and then represent a potential starting point for accidents. This restriction can be particularly significant for landings, where the exit points can be 50 m and more below the water level.

The aim of the present invention is to avoid the disadvantages of the known approaches while maintaining a controlled and controlled installation, and in particular to provide a method and a device for laying a pipeline in a borehole in which large work surfaces are not required both at the start and at the destination are in which the number of operations compared to the HDD method is reduced and its performance over the MT method in the said diameter range is improved.

A first aspect of the invention relates to a device for laying a pipeline in a borehole, as defined in claim 1.

Another aspect of the invention relates to a method of laying a pipeline in a wellbore as defined in claim 15.

Features of advantageous embodiments are defined in particular in the subclaims. The particular embodiments or embodiments described for each aspect of the invention are also to be considered as embodiments or embodiments of other aspects of the invention.

It is expected that the device according to the invention and the method according to the invention can be used advantageously in particular for laying pipelines which have a diameter of approximately 100 mm to 500 mm and have lengths of approximately 100 m to approximately 2,000 m ,

Fig. 1

eine schematische Darstellung eines Ausführungsbeispiels der erfindungsgemäßen Vorrichtung im Überblick,

Fig. 1a

eine schematische Darstellung eines ersten Details des Ausführungsbeispiels von Fig. 1,

Fig. 1b

eine schematische Darstellung eines zweiten Details des Ausführungsbeispiels von Fig. 1,

Fig. 1c

eine schematische Darstellung eines dritten Details des Ausführungsbeispiels von Fig. 1,

Fig. 1d

eine schematische Darstellung eines vierten Details des Ausführungsbeispiels von Fig. 1,

Fig. 2a-2c

schematische Illustrationen von Aspekten eines Bohr- und Verlegevorgangs,

Fig. 3a-3c

schematische Illustrationen eines Bohr- und Verlegevorgangs eines weiteren Ausführungsbeispiels,

Fig. 4a

eine schematische Detaildarstellung der Bohrlagers eines Ausführungsbeispiels,

Fig. 4b

eine schematische Detaildarstellung des Bohrlagers eines abgewandelten Ausführungsbeispiels, und

Fig. 5

ein schematisches Ablaufdiagramm eines Ausführungsbeispiels eines erfindungsgemäßen Verfahrens.

In the following, individual aspects and advantageous embodiments of the invention will be explained in more detail with reference to the accompanying drawings. Hereby shows:

Fig. 1

a schematic representation of an embodiment of the device according to the invention at a glance,

Fig. 1a

a schematic representation of a first detail of the embodiment of Fig. 1 .

Fig. 1b

a schematic representation of a second detail of the embodiment of Fig. 1 .

Fig. 1c

a schematic representation of a third detail of the embodiment of Fig. 1 .

Fig. 1d

a schematic representation of a fourth detail of the embodiment of Fig. 1 .

Fig. 2a-2c

schematic illustrations of aspects of a drilling and laying operation,

Fig. 3a-3c

schematic illustrations of a drilling and laying operation of a further embodiment,

Fig. 4a

a schematic detail of the Bohrlagers of an embodiment,

Fig. 4b

a schematic detail of the Bohrlagers a modified embodiment, and

Fig. 5

a schematic flow diagram of an embodiment of a method according to the invention.

Fig. 1 shows a schematic representation of an embodiment of the device according to the invention in an overview.

The illustrated embodiment includes the drill bearing 8 (see Fig. 1b ), which is partially disposed inside a pipe to be laid in the bottom 10 3 and coupled to a drill pipe 6 and connected to a control tube 18. The drill pipe 6 is connected to a surveying pipe 16 (see Fig. 1b ) as an example of a position determining unit and an angled drilling motor 7 with a drill head 2 (see Fig. 1a ) is provided by a feed device 5 with a rotary motor 9 (see Fig. 1d ) operated and advanced.

Fig. 1a shows a schematic representation of the detail A of the embodiment of Fig.1 ,

The working face 19 of the borehole 1 in the ground 10 lies opposite the boring head 2, which is fastened to the angled boring motor 7 and is driven by the boring motor 7. The parallel to the longitudinal axis of the drill string 7 (not angled) part of the drill motor 7 is guided by a centering 20, wherein the drill motor 7 of the head tube 18 is enclosed in such a way that extends at least the foremost part of the drill head 2 from the control tube 18, although it is ensured that the drill motor 7 and the drill head 2 does not strike the control tube 18 during rotation about the longitudinal axis of the drill string 6. The end of the control tube 18 facing the working face 19 preferably directly adjoins the drill head 2.

The control tube 18 corresponds in (in particular outer) diameter of the pipeline 3 to be laid (see Fig. 1b ). However, the control tube may also have a relative to the pipeline in a modification not shown here also have an enlarged in the millimeter or centimeter range outer diameter.

At the front end of the control tube 18, a control ring 24 is mounted in this embodiment. However, the control ring can also be omitted. The control ring 24 has, as exemplified here, each a wedge-shaped front and back and supports the desired direction changes. The respective wedge-shaped configuration of front and rear side can preferably be designed so that the control ring 24 has a triangular cross section, in which the base side of the triangle rests on the control tube 18 and the top of the triangle opposite the tip in a range of 60 to 90% the length of the base (starting from the top of the triangle 19 facing the working face) is located. However, it is also possible that the control ring has a cross section which is designed wedge-shaped only on the side facing the working face 19 (eg right triangle), although the wedge-shaped configuration on the front and back is advantageous in that both propulsion as well as a retraction of the control tube 18 wedging at an edge can be avoided. The maximum diameter of the control 24 is advantageously no larger than the inner diameter of a borehole resulting in straight propulsion.

The arrows 29 represent the outlet direction of the drilling fluid 12 from the drill head, while the arrows 30 indicate the flow direction of the bottom 10 and possibly cuttings loaded drilling fluid 12.

In the vicinity of the centering 20, which achieves a seal against drilling fluid 12 by means of the seal 25, a plurality of passages 17 are provided in the wall of the control tube 18, which allows drilling fluid 12 to flow through the interior of the control tube 18 and in this way in the head tube 18 got ground or cuttings so that it does not lead to an accumulation of material inside the control tube 18, which would hinder operation of the drilling motor 7 or a rotation of the drilling motor 7 via the drill string.

In a further embodiment, the control tube 18 is designed as a flexible control tube. In particular, it is preferred that the head tube comprises or consists of high density polyethylene (HDPE). Crucial for the flexible head tube in this embodiment is that it is flexurally flexible and can accept the angling of the angled bore motor 7. As an alternative to an entire flexible control tube 18, in another embodiment short, rigid, articulated pieces may be used as the head tube 18. Directional drilling is possible with a flexible control tube 18 as described with respect to FIG FIGS. 3a-3c will be described.

In this embodiment, it is preferred that the control tube 18 approximately abuts the drill head 2. In a rotation of the drill string 6, the flexible control tube 18 follows in this case the direction and thus the angle of the angled drilling motor 7. In this embodiment, the control tube 18 on the drill head 2 and / or on the drill bearing 8 and / or any number of times over the length of Control tube 18 may be mounted on the drill motor 7. Thus, the control tube 18 is free and independent of rotation of the drill string 6 and / or the drill motor 7 movable. Alternatively, the control tube 18 may also be fixedly connected to the drill head 2. For a rotation of the control tube 18 together with the drill head 2 is possible. Alternatively, the control tube 18 can also be firmly connected to the drill bearing 8, whereby rotation of the control tube 18 is only possible together with the drill bearing 8. Of course, the control tube 18 can not be firmly connected to both the drill head 2 and the drill bearing 8, as this would prevent the operation of the entire system.

The drill head, which is adjoined by the control tube, preferably has an outer diameter that is greater in the millimeter or centimeter range than the outer diameter of the control tube. In this case, it is further preferred that the control tube again has an outer diameter, which is also increased in the millimeter or centimeter range in relation to the outer diameter of the pipeline.

All bearings of the flexible control tube 18 may be provided as a sealed bearing. This can be prevented that drilling fluid 12 and / or cuttings in the Head tube 18 penetrate. By the control tube 18 is not flooded in this case, that is filled with air, it has a significantly lower weight. In addition, the ability to drill upwards is hereby improved because such a control tube 18 offers increased buoyancy over its environment filled with drilling fluid 12. It is therefore possible in this embodiment, an easier drilling in the direction of overground. In this example, the control tube 18 on no passages 17.

In a further exemplary embodiment, the nozzle for discharging the drilling fluid 12 from the drill head is configured such that drilling fluid 12 does not exit the drill head in the direction of the working face 19 according to the arrows 29, but is additionally guided in the other direction into the interior of the control tube 18 becomes. This advantageously makes it possible for soil or cuttings that have entered the control tube 18 to be flushed out by the additional drilling fluid 12 introduced into the control tube. As a result, the removal of material from the interior of the control tube 18 is further optimized, so that the operation of the drilling motor 7 is not hindered.

Fig. 1b shows a schematic representation of the detail B of the embodiment of Fig.1 ,

On the face side is the inner part of the Bohrlagers 8 (see Fig. 3a, 3b ) is connected to the surveying pipe 16. A measuring probe 13, which transmits measured values with respect to a position of the surveying tube 16 (and thus ultimately with respect to the drilling motor 7 and the drill head 2) via cable 14 to the surface, is arranged in the surveying tube 16. The surveying pipe 16 in turn is firmly connected to the angled drilling motor 7 (see Fig. 1a ), so that the coincidence of position of the surveying pipe 16 and the drilling motor 7 results. Like the angled drill motor, the surveying tube is also centered in the control tube 18 by means of a centering 20. The control tube 18 is connected to the non-rotating, outer part of the Bohrlagers 8 at its side facing the working face. On the opposite side of the working face of the inner part of the Bohrlagers 8 is connected to the drill pipe 6, while the outer part of the Bohrlagers on the side facing away from the working face is connected to a first single pipe 4 to be laid pipe 3.

The drill bearing 8 is characterized in that it forwards the feed forces and torques introduced by the drill pipe 6 to the surveying pipe 16 (and thus to the components connected to the surveying pipe 16) to the control pipe 18 and the pipe 3 but only axial forces (forces acting in the longitudinal direction of the drill pipe) and no torque transfers.

In the measuring tube 16 arranged in the measuring probe 13 is in this embodiment, based on the principle of the gyroscope probe, which also has accelerometer and an electric solder. Thus, a direction (azimuth) as well as inclination (inclination) of the surveying tube as well as the position of the buckling piece of the angled drilling motor 7 (which is relevant for the direction of drilling (see Fig. 2a-2c )). All measured values are transmitted via a cable 14 that leads in the interior of the drill pipe 6 to the surface. However, alternatives to a wired signal line may also be used, as long as the circumstances of the drilling and laying operation allow such alternatives. The basic technique of determining the position of the drilling motor and the drill head is known to those skilled in the HDD method, for example, so that no further details have to be discussed here.

In a further embodiment, the measuring probe 13 can not be arranged in the surveying pipe 16, ie on the face side of the drilling bearing 8, but on the opposite side of the drilling bearing, ie in the first single pipe 4. In another embodiment, a measuring probe 13 on both sides the Bohrlager 8 be arranged, or at any other position.

Furthermore, in one exemplary embodiment, a nozzle can additionally be provided on the face side of the drilling journal 8, which feeds the drilling fluid 12 in the direction of the working face 19 starting from the surroundings of the drilling bearing 8. Thus, a back pressure within the Vermessungsrohres 16 is generated, which counteracts the drilling pressure of the drilling fluid, which emerges from the drill head 2. Thereby, the relative pressure in the surveying tube 16 can be reduced, whereby a malfunction or malfunction of the drilling assembly can be avoided.

Fig. 1c shows a schematic representation of the detail C of the embodiment of Fig.1 ,

The drill string 6 extends through the pipe 3 and is guided by a centering 20 in the interior of the pipe 3. The diameter of the working face 19 is greater than the outer diameter of the pipe 3, so that between the ground 10 around the borehole and the pipe 3 results in an annular space 11 through which in particular bored with bored material drilling fluid 12 can flow.

The centering 20 is here provided with inner rollers 22, which allow a relative rotation of the drill pipe 6 and centering 20, without appreciable torques would be involved or would be involved. The axes of the inner rollers 22 extend parallel to the longitudinal axis of the drill string 6. The centering also has outer rollers 21 whose axes in the illustration shown extend perpendicular to the plane, so that a substantially free displacement of the centering 20 relative to the pipe 3 in the direction of the drill string 6 results.

To a fixation of the centering 20 against a displacement in the longitudinal direction of the drill string 6 relative to the drill pipe 6 retaining rings 31 are provided in front of and behind the centering on the drill pipe 6.

In a modification, not shown, at least one element (or part-element) of which the drill string is composed may be configured in the form of a screw tube and / or at least one centering may be in the form of a screw conveyor, these conveying means being designed such that During rotation of the drill pipe during drilling, a conveying action for drilling fluid (which is loaded with soil or cuttings) in the area between the pipeline and drill pipe leads in the direction of overground.

Fig. 1d shows a schematic representation of the detail D of the embodiment of Fig.1 ,

Shown is the überätige part of the entire arrangement with the feed device 5 and the rotary motor 9. When laying the pipe 3, the pipe itself is composed of individual tubes 4, which are successively introduced into the borehole 1. The respective last individual pipe 4 of the pipeline 3 is connected to the feeding device 5 in a pressure-resistant manner (possibly also with a tensile strength and / or torsion-proof) via a connecting device 15 which is adjustable in length. As a result, feed forces can be applied directly from the feed device 5 to the pipe 3. This can be useful, for example, if the friction in the borehole is very large and requires additional feed forces.

However, in the present embodiment, the "normal" feed forces for the drilling and laying operation are transmitted from the feed device 5 via the drill pipe 6 to the drill bearing 8. The drilling bearing 8 forwards the pressure forces introduced by the drill pipe 6 as pressure forces on the surveying pipe 16, the angled drilling motor 7 and the drill head 2 and on the control tube 18 and in the form of tensile forces on the pipeline 3.

The drill string 6 is connected to the rotary motor 9 of the feed device 5. In (continuous) rotation of the rotary motor 9 drill pipe 6, surveying pipe 16, angled drilling motor 7 and drill head 2 are also rotated (continuously). When the drive of the angled drilling motor 7 is added (which relates its drive energy in the manner known to those skilled in the art from the drilling fluid 12 flowing through it), the drill head 2 is additionally rotated in the form of a superimposed rotational movement. With simultaneous advance of the drill set a straight hole 1 is created in this way (see Fig. 2b ). The rotation of the drilling motor 7 with the drill head is illustrated by the dashed representation in another angular direction.

If drill pipe 6, surveying pipe 16, angled drilling motor 7 and drill head 2 are rotated by the rotary motor 9 of the feed device 5 into a specific position detectable by the measuring probe 13, a curved borehole along the respective orientation of the angle piece in the angled drilling motor will be produced as the drilling process continues 7 created, but then the drill pipe 6 is no longer rotated and only the drill motor 7 drives the drill head 2.

Drilling fluid 12 used for the drilling process is pumped to the drill head 2 by the advancing device 5, the drill pipe 6, the drill bearing 8, the surveying pipe 16 and the angled drilling motor 7. There, the drilling fluid 12 enters the wellbore 1 (see arrows 29 in FIG Fig. 1a ) and mixes with the soil 10 or cuttings loosened by the drill head 2. The drilling fluid mixed with soil 10 and / or cuttings then flows through annular space 11 between pipeline 3 and borehole 1 to above ground (see arrows 30).

In the embodiment shown here, the centering 20 is formed with a seal 25, so that the drilling fluid 12 is prevented from penetrating into the interior between the drill motor 7 and control tube 18 or drill pipe 6 and pipe 3. An advantage of this design is that then, for example, air-filled Interior between the drill motor 7 and control tube 18 or drill pipe 6 and pipe 3 acts as a buoyant body against the filled with drilling fluid 12 annulus 11 and thereby the normal forces in the borehole 1 are significantly reduced. This in turn can result in significantly lower feed forces, so that such an approach is recommended, for example, especially in soft soils.

In an alternative embodiment (and not shown here), the drilling fluid 12, which is mixed with the bottom 10 and, if appropriate, cuttings, additionally flows through the interior of the pipeline 3 to above ground. For this purpose, the centerings 20 and the drill bearing 8 are to be formed with corresponding passages. It is to be regarded as advantageous in this design that thereby the pressure in the annular space 11 is reduced and thus outbreaks of the drilling fluid 12 to the surface of the day ("blower" gennant) can be better avoided. This variant appears advisable especially for clayey soils.

In a modification of the embodiment discussed here, as an alternative and / or in addition to the borehole provided in the borehole, a corresponding borehole is provided in the area of the advancing device, more precisely between the respectively last single pipe and the connecting device, so that also via this borehole a compressive force from the drill pipe can be introduced to the pipeline.

Fig. 2a-2c show schematic illustrations of aspects of a drilling and laying operation, in particular the direction control of the drilling and laying operation.

In Fig. 2a FIG. 5 illustrates how a downhole curved section in this example is created following a straight borehole section. To create the curved borehole section, the working direction of the boring head 2 is fixed in a specific position as described above. Upon continuation of the drilling operation (ie the drill head 2 is further rotated by the drill motor 7 about its axis) a curved borehole 1 is now created.

In Fig. 2b It is shown how the drilling and laying process takes place in a planned straight borehole section. For this purpose, the drill head 2 is not only rotated about its own axis, but also by rotation of the (not shown) drill pipe 6 with the associated components in addition to the axis of the drill pipe 6 and the Pipe 3. As a result, the working direction of the drill head 2 is permanently changed, whereby in the end a straight borehole section is created.

In Fig. 2c is basically the same process as in Fig. 2a shown, however, the borehole 1 is executed here with a curvature down.

Fig. 3a-3c show schematic illustrations of aspects of a drilling and laying operation, in particular the direction control of the drilling and laying operation according to the embodiment with flexible head tube 18th

In Fig. 3a is different from Fig. 2a to see that the control tube 18 rests against the drill head 2 and is connected thereto. This connection can be fixed, such that the control tube 18 rotates together with the drill head 2, or be stored, such that the drill head 2 can rotate independently of the control tube 18. As well as in Fig. 2a is in the embodiment of Fig. 3a the direction of the drill head 2 is fixed in one direction, in this case upwards, whereby directional drilling, in this case consequently in the direction of overground, is made possible. Accordingly, the borehole 1 in this case has a curvature upwards.

When straight ahead in Fig. 3b becomes as above with reference to Fig. 2b explained, in addition to the drive of the drill head 2 by the drill motor 7, the drill pipe 6 set in rotation, whereby the angled drill motor 7 per revolution of the drill string 6 passes through all inclination angles with respect to the axial direction. As a result, the working direction of the drill head 2 is permanently changed, whereby in the end a straight borehole section is created. In this case, the flexible control tube 18 follows the drill motor 7 or the drill head 2 by bending and / or rotating, depending on the storage or mounting with respect to the remaining components.

In Fig. 3c is basically the same process as in Fig. 2a shown, but the hole 1 is here, analogous to Fig. 2c , executed with a curvature down.

In the Fig. 3a-3c the device has a centering 20. It should be noted that the centering 20 may only connect the drill motor 7 firmly to the control tube 18 when the control tube 18 is mounted on the drill head 2, since otherwise independent of the drilling gear rotation of the drill head 2 is prevented. In the case in which the drill head 2 is fixedly connected to the control tube 18, the centering 20 must be used as a bearing be educated. In a further embodiment, the device has no centering 20, in yet another embodiment, two or more centerings 20 are provided.

Fig. 4a shows a schematic detail of the drilling of an embodiment, while Fig. 4b a schematic detail of the drilling of a modified embodiment shows.

To recognize are in Fig. 4a the actual bearings 28, which separate the rotating during operation or rotated inner part of the Bohrlagers 8 from the non-rotating outer part of the Bohrlagers 8 and at the same time the transmission of large axial forces (about 500-2500 kN) from the inner to the outer part allow the Bohrlagers 8. To protect the bearing 28 corresponding seals 23 are provided.

The outer part of the drilling journal 8 is here connected by means of screw connections 27 (for example grub screws) to the control tube 18 and to the first individual tube 4 of the pipeline 3. Alternative connection types - e.g. by means of welded joints - are possible, but may have as in the case of welding disadvantages of heat on the drill bearing 8 during assembly and / or a more difficult disassembly compared to screw 27. In addition to the non-positive and positive threaded connection can also be a purely positive Connection can be achieved, for example by undercuts.

In Fig. 4b the use of doublings 26 is shown. These doublings 26 make it possible to use a drilling journal 8 for different diameters of control tubes 18 and pipelines 3. This has significant economic benefits since such doublings 26 (unlike the rest of the drilling journal 8) are very inexpensive to manufacture.

The connection of drilling bearing 8 with the Vermessungsrohr 16 and the drill pipe 6 via typical threads that are otherwise known and common in the drilling area, for example, for connecting individual elements of a drill pipe or a connection of a drilling motor. However, alternative connections are readily possible provided the relevant technical requirements are met.

Fig. 5 shows a schematic flow diagram of an embodiment of a method according to the invention in the case that a drill bearing between the drill motor and drill pipe is provided.

In step 101, a drill string is coupled to a drill bit angled or angled with respect to the longitudinal axis of the drill string, which coupling is an indirect coupling, by coupling the drill motor to a drill bearing and coupling the drill bearing to the drill string for transmission of a drill bit Torque and a compressive force and possibly a tensile force is created.

Alternatively, the drill pipe can be coupled to the drill motor without any intermediate connection, in which case the drill bearing is provided on the side of the drill pipe in the direction of a feed device. It is also possible to combine both alternatives.

In step 102, a control tube is provided which encloses the drill motor with the drill head, wherein the drill head extends in operation in the direction of the working face of the head tube.

In step 103, the drill bearing is connected to the pipeline to be laid and the head tube. In the case of this embodiment, in which the drill pipe and the drill motor are coupled indirectly with insertion of the drilling bearing, the control tube is connected to the local side of the Bohrlagers this, wherein the pipeline (more precisely, the first single pipe to be assembled and laid pipeline) with is connected to the drill bearing on the opposite side. In this case, provision is made in particular for the control tube and the pipe to abut each other in the area of the drilling journal and to be aligned with one another when the drilling journal is connected to the respective inner sides with the head tube and the pipeline. Other versions are also possible.

If the coupling of drill motor and drill string directly, so the Bohrlager in the field of feed device (and the rotary motor) is provided, the connection of the control tube and drill bearing results indirectly through the connection of drilling and pipe and a connection of pipe and head tube.

It should be noted that a "direct coupling" of the drill motor and drill pipe does not preclude the provision of a surveying pipe (as discussed above) between the drill motor and drill pipe, similarly, in the case of "indirect coupling", the drill motor may be provided with a surveying pipe. Advantageously, a surveying pipe as discussed or another position determining unit is provided on the drilling motor.

For straightforward routing of the tubing, in step 104, the method includes rotating the drill string to rotate the drill motor with the drill head and rotate the drill bit about its longitudinal axis with the drill motor independent of rotation of the drill string.

For a curved routing of the tubing, in step 105, the method includes rotating the drill string until a position determining unit of the drilling motor indicates a position at which the drilling motor is angled or angled in the direction of the curvature, and at step 106 rotating the drill head about its longitudinal axis with the angled drill motor.

During installation of the pipeline (ie during steps 104, 105 and 106, respectively), a pressure force acting in the direction of the longitudinal axis of the drill pipe is exerted on the drill bearing by the drill pipe as a tensile and / or tensile force acting through the drill bearing as a tensile force acting in a longitudinal direction of the pipeline. or compressive force on the pipeline and as a force acting in the longitudinal direction of the control tube pressure force is passed.

It should be noted that the order of steps 101, 102 and 103 may also be varied.

An implementation of the invention provides a method for laying a pipeline in a borehole, wherein the borehole 1 is created by a controllable boring head 2 and the boring head 2 has a larger diameter than the pipeline 3 and the respective position of the boring head 2 in the ground 10 a arranged in a surveying pipe 16 measuring probe 13 is determined and transmitted via at least one cable 14 to overground, the drilling process to create the borehole 1 and the laying process for laying the pipe 3 in the borehole 1 take place simultaneously, the pipe 3 during the drilling and Laying process is successively composed of individual tubes 4, which required for the drilling and laying process Feed force is generated by a feed device 5 and transmitted via a drill pipe 6 to a drill bearing 8 and the drill bearing 8 both via the Vermessungsrohr 16 and the angled drill motor 7 on the drill head 2 and on the control tube 18 and the pipe 3, for the drilling process required torque is generated by the angled drill motor 7 and transmitted to the drill head 2, the control of the drill head 2 is made via a rotary motor 9 located on the feed device 5 and the rotational movements of the rotary motor 9 via the drill pipe 6, the surveying pipe 16 and the angled drilling motor. 7 be transferred to the drill head 2, the required drilling fluid for the drilling 12 through the drill pipe 6 and the drill motor 7 is pumped to the drill head 2 and the dissolved during the drilling process of the drill head 2 bottom 10 hydraulically from the drilling fluid 12 through the annulus 11 of the Borehole 1 is promoted, where, na Chdem the drill head 2 has reached the target point 17, the drill bearing 8, the control tube 18, the Vermessungsrohr 16, the angled drill motor 7 and the drill head 2 are separated from the pipe 3 and the drill pipe 6 is pulled out of the feed device 5 from the pipe 3 , <U> REFERENCE LIST </ u> 1 well 101 Coupling of drill string and drill motor 2 wellhead 102 Provide a head tube 3 pipeline 103 Connecting a Bohrlagers with piping and head tube 4 Single tube 104 Turning drill pipe and drill head 5 feed device 105 Position turning of the drill string 6 drill pipe 106 Turning the drill head 7 drill motor 8th Bohrlager 9 rotary engine 10 ground 11 annulus 12 drilling fluid 13 probe 14 electric wire 15 connecting device 16 surveying pipe 17 passage 18 head tube 19 working face 20 centering 21 outer roller 22 inner roller 23 poetry 24 control ring 25 poetry 26 doubling 27 screw 28 warehouse 29 Outflow of drilling fluid 30 Drainage of drilling fluid 31 retaining ring

Claims (15)

1. A device for laying a pipeline (3) in a borehole (1), having
   a drill motor (7) angled or able to be angled relative to the longitudinal axis of a drill pipe (6) for a drill head (2) provided for a drive of the drill head (2) independently of a rotation of the drill pipe (6),
   a position determination unit (16) for determining and transmitting a rotational position of the angled drill motor (7), and
   a head tube (18) at least partially enclosing the drill motor (7), the drill head (2) extending from the head tube (18) in the direction of a working face (19) during operation,
   characterized by
   a drill bearing (8) for coupling to the drill pipe (6) for receiving a compressive force acting in the direction of a longitudinal axis of the drill pipe (6) and for connecting to the pipeline (3) for transferring the compressive force as a tensile and/or compressive force acting in the longitudinal direction of the pipeline (3).
2. The device according to claim 1,
   wherein the head tube (18) is reversibly deformable, wherein the head tube (18) in particular comprises or consists of a flexible material, in particular high-density polyethylene (HDPE) and/or the head tube (18) comprises a plurality of articulated elements connected to each other.
3. The device according to claim 2,
   having a one- or multi-part centring device for directly or indirectly coupling the head tube (18) to the drill motor (7), said motor drill being disposed so that the head tube (18) is deformed according to the rotational position of the drill motor (7), wherein the centring device in particular is designed for tightly closing off the drill head (2) or the drill motor (7), preferably for a tightly closing off the passage of air and/or drilling fluid.
4. The device according to claim 1,
   wherein the head tube (18) is provided with a control ring (24) in a region of its outer side facing the working face (19) for supporting following of a curvature of the borehole (1) through the head tube (18), in particular having a control ring (24) having a cross-section in the form of a triangle, the base side thereof resting against the outer side of the head tube (18), wherein preferably the tip of the triangle is disposed above a half of the base side of the triangle facing away from the working face (19).
5. The device according to claim 1,
   wherein the head tube (18) is provided with a seal opposite the working face (19), the drill head (2) or the drill motor (7) extending through said seals, wherein the seal is provided with an eccentric opening for drill head (2) or drill motor (7) and is designed for rotating relative to the head tube (18) and/or wherein the seal is designed to be deformable for receiving the movement of the drill head (2) or drill motor (7) during operation.
6. The device according to claim 5,
   wherein the device is designed for pressurizing the interior of the head tube (18), in particular by a liquid.
7. The device according to any one of the preceding claims,
   further having a rinsing element for discharging drilled material that has entered into the head tube (18), wherein the rinsing element is designed in particular for using drilling fluid (12), wherein the flushing element is preferably disposed in the region of a termination of the head tube (24) facing away from the working face (19) and acts in the direction of the working face (19) and/or the rinsing element is disposed in the region of the drill head (2) and acts away from the working face (19), wherein the head tube (18) comprises discharge openings (17) at a rinsing element acting away from the working face (19) particularly preferably in a region facing away from the working face (19).
8. The device according to any one of the preceding claims,
   wherein the drill bearing (6) comprises one or more false edges (26) for adjusting the outer diameter of the drill bearing (6) to a diameter of the pipeline (3).
9. The device according to any one of the preceding claims,
   wherein the device is designed for draining drilling fluid (12) laden with bored material through a space (11) between the borehole (1) and an outer side of the pipeline (3) and/or through a space between the drill pipe (6) and an inside of the pipeline (3).
10. The device according to any one of the preceding claims,
    having one or more centring devices (20) for the drill motor (7), the position determination unit (16) and/or one or more elements of the drill pipe (6) in the head tube (18) and/or in the pipeline (3), wherein the maximum outer diameter of the one or more centring devices (20) is preferably smaller by 1 to 10 mm than the respective minimum inner diameter of the head tube (18) or the pipeline (3).
11. The device according to claim 10,
    further having the drill pipe (6), wherein the drill pipe (6) is provided with at least two retaining rings (31) for positioning a centring device (20) on the drill pipe (6).
12. The device according to any one of the claims 10 to 11,
    wherein at least one centring device (20) is designed for rotating the centring device (20) about a longitudinal axis of the drill pipe (6) relative to the drill motor (7), the position determination unit (16) or the drill pipe (6) and for shifting the centring device (20) along the longitudinal axis of the drill pipe (6) relative to the pipeline (3), wherein the centring device (20) preferably comprises rollers (22) on the inner side thereof, the axes thereof being aligned parallel to the longitudinal axis of the drill pipe (6), and rollers (21) on the outer side thereof, the axes thereof being aligned in a plane perpendicular to the longitudinal axis of the drill pipe (6).
13. The device according to any one of the preceding claims,
    further having the drill pipe (6), wherein the device is designed for discharging drilling fluid (12) laden with drilled material through a space between drill pipe (6) and an inner side of the pipeline (3), wherein the drill pipe (6) is designed at least partially as a screw tube and/or the device is provided with a centring device (20) designed as a screw conveyor.
14. The device according to any one of the preceding claims,
    wherein the drilling bearing (6) is provided during operation as a connecting element for the head tube (18) and the pipeline (3) in the region of a beginning of a drill string and/or as a thrust element for already laid pipeline elements (4) between one end of the last laid pipeline element (4) and a feed device (5).
15. A method for laying a pipeline (3) in a borehole (1), having the steps:

    coupling (101) a drill pipe (6) to a drill motor (7) angled or able to be angled relative to the longitudinal axis of the drill pipe (6) for a drill head (2), the coupling (101) being an indirect coupling via a drill bearing (8) and/or a coupling without the interposition of a drill bearing (8),

    providing (102) a head tube (18) at least partially enclosing the drill motor (7), the drill head (2) extending from the head tube (18) in the direction of the working face (19) during operation,

    connecting (103) the drill bearing (8) to the pipeline (3) to be laid and the head tube (18), the head tube (18) and the pipeline (3) being connected thereto on sides of the drill bearing (8) opposite each other in the case of only indirect coupling (101) of drill pipe (6) and drill motor (7) and otherwise the head tube (18) being connected indirectly to the drill bearing (8) via the pipeline (3),

    wherein the method for laying the pipeline (3) straight according to the plan comprises:

    turning (104) the drill pipe (6) for rotating the drill motor (7) with the drill head (2) and turning (104) the drill head (2) about longitudinal axis thereof with the drill motor (7) independently of a rotation of the drill pipe (6), and

    wherein the method for curved laying of the pipeline (3) comprises:

    turning (105) the drill pipe (6) until a position determination unit (16) of the drill motor (7) indicates a position at which the drill motor (7) is angled or can be angled in the direction of the curvature,

    turning (106) the drill head (2) about the longitudinal axis thereof with the angled drill motor (7),

    wherein during the laying of the pipeline (3) by the drill pipe (6), a compressive force acting in the direction of the longitudinal axis of the drill pipe (6) is exerted on the drill bearing (8) and transfers through the drill bearing (8) as a tensile and/or compressive force on the pipeline (3) acting in a longitudinal direction of the pipeline (3) and as a compressive force acting in the longitudinal direction of the head tube (18).

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