EP3696369A1 - Earth boring device for cable-guided drilling, method for cable-guided earth boring and use in cable-guided earth boring - Google Patents

Abstract

The invention relates to an earth drilling device for cable-guided drilling with a drive for connecting and / or moving rod sections of a drill rod along a drill rod axis, a cable supply for receiving a cable with a length of at least two rod sections and a contact device for electrically contacting one end of the cable of the cable supply are provided.

Description

The invention relates to an earth drilling device for cable-guided drilling with a drive for connecting and / or moving rod sections of a drill rod along a drill rod axis, a method for cable-guided earth drilling in which a rod section is part of a drill rod drilled in the ground and in which a cable is present, is connected to a further rod section and a use in cable-guided earth drilling, in which rod sections are used in which a cable is arranged, with cables of adjacent rod sections are connected to one another.

In order to be able to precisely control an earth drilling, the position of the drill head in the ground must be recorded as precisely as possible. There are essentially two different methods available for this.

The position of the drill head can be determined by a transmitter in the drill head by means of an electromagnetic field through the ground, for this purpose a method known as the walk-over method is used. The walk-over method enables quick location and uncomplicated handling. Above the ground, the boring head is localized with a reception strength measuring device (receiver), the maximum signal strength of the transmitter signal from the transmitter in the boring head being determined as a function of the position of the reception strength measuring device above the ground. The signal strength depends on the Transmitter depth in the ground, which also enables depth determination. With increasing drilling depths, however, the deviation tolerance increases.

For great depths, greater accuracy at shallower depths and / or under shielding or completely inaccessible obstacles, cable-guided drilling is used to locate the drill head. For this purpose, each section of the drill rod, in particular each rod section, is provided with an internal cable which is connected to the adjacent sections of the drill rod, in particular to further rod sections. At the end, the cable is led to the outside after each addition of a rod section and connected to a slip ring, on which data from a probe on the drill head or a position adjacent to the drill head can be picked up. The data can be displayed to an operator, in particular in a control cabin. To change the rods, it is necessary that the cable is connected to the cable of the adjacent rod section, which has already been drilled, or to another section of the drill rod, with the connection being protected manually in an electrically insulating manner and the free end of the cable of the newly added rod section through the drill rod to the outside and connected to the slip ring. The process used so far and the devices used so far are time-consuming and costly.

The object of the present invention is therefore to create an earth drilling device, a method and a use with which the effort in terms of time and / or costs can be reduced.

The object is achieved by the subjects of the independent claims. Advantageous embodiments are the subject matter of the respective subclaims and the following description.

The core idea of the invention is to provide a cable supply with a length of at least the length of two rod sections, in which one end of the cable supply is in constant contact with a contact device for electrically contacting the end of the cable in order to at least one of the electrical contacts not having to repeatedly disconnect and reconnect when adding a rod section or changing rods. The inventors have broken with the idea that for a newly added section of the drill rod, ie in particular a rod section, a cable section must be used which, for each newly added rod section, is connected at one end to the end of the cable in the drill rod that has already been drilled must be and on the other hand at the other end with the sliding contact provided on the earth auger to pick up the signals of the cable must be connected. When adding a rod section or when changing rods, the drive is released from the drill rod that has already been drilled and a drill rod is inserted into the drill rod axis and connected to the drive. The rod section connected to the drive is then connected to the drill rod that has already been bored in the ground, so that, according to previous considerations, the two ends of the rod section to be added also have to be re-contacted. So far, this consideration has been carried over to the newly added cable. It is to the merit of the inventors to have recognized that this idea has been broken.

The inventors have thus broken away from the notion that the cable must be introduced into the drill rod as well as the connection of the rod section to be inserted into the drill rod.

Although only one connection is made between the cable of the cable supply and the cable of the drill rod that has already been drilled, there is always the possibility, after only this one connection has been made, signals to the end of the cable supply along the drill rod axis to the other end of the cable in the front area of the drill rod to send or receive from this.

The invention provides an earth drilling device for cable-guided drilling with a drive for connecting and / or moving rod sections of a drill rod along a drill rod axis. A cable store for receiving a cable with a length of at least two rod sections and a contact device for electrically contacting one end of the cable of the cable store are provided. This creates the possibility of only providing a connection to the cable already in the drilled drill pipe in order to connect it to the cable of the cable store when the drill pipe that has already been drilled into the ground is extended by a further pipe section in which a cable must be arranged and electrically isolate.

For the purposes of the description, an "earth boring device" is any device that moves in particular a drill pipe having a rod section in an existing or to be created channel in the ground in order to create a bore, in particular a horizontal bore (HD), or to widen or pipe or other long Pulling bodies into the ground. The earth drilling device can in particular be an HD device. An earth boring device can thus be a device driving a drill pipe, which works in a soil-displacing manner and brings the drill pipe into the earth in a translatory and / or rotary manner in the longitudinal axial direction of the drill pipe. A borehole can be drilled into the ground by applying tension or pressure to the drill pipe.

In the context of the description, the term “rod section” does not exclusively include rigid, individual force transmission elements that can be connected directly or indirectly to one another and that can be used in an earth boring device.

The term "HD" (horizontal drilling) in the context of the present description includes in particular an at least partially horizontally arranged bore or a horizontally arranged channel or pipeline.

The drill rod can have a drill head and an optionally present drill head tip at one end, in particular at the front. The drill string may have a front drilling tool.

The term “drive” in the sense of the description comprises a drive means which can be moved to and fro and which can be designed in particular for a connection to one end of a rod section that is to be newly drilled. The drive means can be connected to one end of the rod section, while the other end of the rod section can be connected to the drill rod that has already been drilled. An extension of the drill rod can thus be carried out by adding a rod section or changing the rod. The connection between the drive means and the rod section can be force-fit and / or form-fit. The drive means can be moved back and forth on a drill carriage, for example by means of a slide, in order to apply a tensile force or a pressure force to the drill rod connected to the drive means.

The term "drill rod axis" includes in particular the axis that can be formed by the longitudinal axes of the individual rod sections of the drill rod, with the longitudinal axes of the rod sections being considered that are present in the drill rod in the closer area of the earth boring device. In particular, the rod section that was drilled last or the rod section that is next to be drilled or connected to the drill rod can be considered. The drill rod axis is in particular the axis with which the drive picks up the rod section to be drilled and can thus correspond to the longitudinal axis of the rod section to be drilled. The drill pipe axis can essentially coincide with the longitudinal axis of the drive means of the auger.

The term “cable” in the sense of the description comprises a single-core or multi-core combination of lines sheathed with an insulating material, which is used in particular to transmit energy and / or information. Electrical signals can be transmitted via a cable. If the cable has several lines or wires, there is a parallel or simultaneous transmission of several signals possible. Cables can be connected by stripping one end of a cable with a further stripped end of a cable in that the cables are clamped together or otherwise mechanically and / or cohesively connected to one another. To protect the connection, the connection point can be insulated, in particular with a shrink tube.

The term “contact device” in the context of the description comprises a contact element with which one end of the cable of the cable supply is in electrically conductive contact. The contact device accordingly has an electrically conductive contact element. The contact element can be in constant contact with a display and / or a data processing unit, which can be designed as a computer and has a controller or the like. The signals can be displayed on the display, in particular in an operator's cabin, particularly preferably after processing by means of the controller.

If it is described that the cable supply has a length of at least twice the length of a rod section, this includes a preferred embodiment that ensures that a further rod section is first connected to the drill rod that has already been drilled and a cable is arranged in the rod section to be added can be. In a particularly preferred embodiment, the cable supply has a cable with a length which corresponds at least to the length of three, four or more rod sections. The cable supply can have a cable with a length of at least 50 m, preferably at least 60 m, preferably at least 70 m, preferably at least 80 m, preferably at least 90 m, preferably at least 100 m. Depending on the length of the drilling to be carried out, lengths of a cable of a cable store of more than 100 m are also possible.

In a preferred embodiment, the cable supply has a reel which is arranged on the auger. This brings the cable stock into a manageable, compact form and prevents the cable from becoming tangled or knotted. It is also possible to determine the length when the cable is reeled onto the reel and / or to determine the amount of cable used when the cable is unwound.

In a preferred embodiment, the reel is arranged around the drill pipe axis. This makes it possible to create a particularly simple structure and a particularly simple arrangement in which handling is simpler.

For the purposes of the description, the term "arranged around the drill pipe axis" is to be understood such that the central axis of the reel of the cable supply is concentric to the central axis of the connection, which coincides with the drill pipe axis, is aligned. The axis of rotation of the reel, ie the central axis, coincides with the axis of the drill pipe. A simple design with a simple construction is possible. In particular, the cable supply or the reel can be arranged on the outside and surround the drill rod axis. Such a supply from the outside can be preferred and enables a simple construction with little effort when replacing or refilling the reel with a supply of cables, since access from the outside facilitates handling. A space-saving structure is thus possible. Few components are required, which can simplify the construction and reduce costs. The mass of the parts / elements moving when the cable is fed in can be kept low. A complex hydraulic rotary feedthrough is not absolutely necessary.

In a preferred embodiment, there is a cable feed with at least one guide roller, which can be designed as a deflection roller, which is used for an orderly supply of the cable. This enables a supply in which the cable supply can be arranged independently of the drill rod axis and / or in which a flexible arrangement of the cable supply is possible.

In a particularly preferred embodiment, the cable feed, in particular in the form of a rotary leadthrough, is designed for an axial feed into the drill rod axis. For this purpose, several guide rollers can be present that deflect the cable into the desired orientation and / or position. While in the previous earth drilling device for cable-guided drilling a sliding contact is provided directly on the drive or the drive means, the supply of cables or the cable feed can also be present outside an axial axis, in particular an opening on the drive means for manual passage of a cable can be dispensed with . Flexibility in the arrangement of the cable supply and / or the position of the contact device is possible.

In a preferred embodiment, a seal is provided on the cable feed for sealing against flushing fluid that can be fed to the drill rod. In particular, a seal can be used which essentially permanently closes a feed opening for the cable from the cable store. In particular, the opening can be an opening arranged in a rotary leadthrough which is coaxial with the rod section to be drilled, which is connected to the drive means. There is the possibility of further simplifying handling steps in that the seal does not have to be repeatedly formed manually. The drive means can be supplied with rinsing liquid - even under pressure - which does not exit from the drive means.

A rotary feedthrough can be used that aligns the cable axially with the drill pipe axis. In particular, the cable can be guided through the rotary leadthrough in an essentially centered manner, in particular aligned essentially with the central axis of the drill rod. The rotary leadthrough can have an opening at one end for the cable coming from the cable store. On the other hand, the rotary leadthrough can have a connection that is connected to a rod section of the drill rod or a new rod section that is to be connected to the drill rod that has already been drilled. The connection can, in particular, rotate with the drill rod if a rotational movement is impressed on the drill rod. The connection can be connected directly or indirectly to the drill pipe. For example, the connection can be connected to a drive means, in particular in the form of a hollow shaft, which can be rotated externally by a drive; and the drive means can be connected on the other side to the drill string. The drill rod can in particular be the inner rod of a double pipe rod. The drill pipe can be a "simple" pipe in which there is no internal pipe. The connection to the rotary leadthrough can in particular be designed to form a form fit with the drill rod or the drive means or an adapter.

In a preferred embodiment, the cable supply is arranged at the end on a rotary leadthrough at a distance from the connection, which is indirectly or directly connected to a rod section. As a result, the cable of the cable supply can reach through the rotary leadthrough or the connection from behind or extend at least partially or completely through the rotary leadthrough. With the aforementioned preferred embodiment, the inventors are pursuing a previously absurd approach that the cable can extend completely through a rotary feedthrough, although the cable can be accessed continuously. In particular, access can be reduced to access only in the area of the end of the newly added or to be added rod section which is spaced apart from the drill head. For example, starting from the supply, the cable can extend through the rotary feedthrough and a drive means in the form of a hollow shaft, which is driven in rotation by a drive, without the need to separate or break the connection in and through the areas mentioned.

In a preferred embodiment, a traction means is present, which can in particular be designed in the form of a hydraulic motor. In an alternative or in an additional embodiment, the traction means can be configured as a hydraulic cylinder, electric motor, electric cylinder, motor or cylinder operated by compressed air. In an alternative or additional embodiment, the traction means can be designed as a spring or spring means or have a spring or a spring means, by means of which a spring preload is exerted on the cable in order to keep the cable under tension. The traction means is functionally connected to the cable supply and is designed to hold the cable under tension. In this way, it can be largely avoided that the cable is squeezed when connecting the rod sections. As a result of a possible, essentially concentric feed of the cable, the cable can be kept outside the area which is relevant for the mechanical connection of the rod sections or the sections of the drill rod. A concentric feed of the cable through the drive means with a tensile load on the cable of the cable supply, in particular connected with an essentially concentric arrangement of the cable in the drill rods that have already been drilled, can advantageously be used to keep the cable outside the elements provided for connecting the rod sections; Cable breaks and / or cable tears can be avoided.

The invention also provides a method for cable-guided earth drilling, the method comprising the step of connecting a pipe section, which is part of a drill pipe which is drilled in the ground and in which a cable is present, to a further pipe section. A cable with a length of at least two rod sections is provided. Furthermore, continuous electrical contact is established at one end of the cable with a length of at least twice the length of a rod section during the connection of rod sections. In this way, when connecting a new cable for a rod section to be added or when changing rods, the previous cable is disconnected and only one connection of the cable of the cable supply is necessary to drive the drill rod further.

The invention also provides use in cable-guided earth drilling, in which rod sections are used in which a cable is arranged, with cables of adjacent rod sections being connected to one another. A cable store for receiving a cable with a length of at least twice the length of a rod section and a contact device for constant electrical contact with one end of the cable of the cable store are used.

The invention has been described on the basis of three aspects relating to the earth drilling device, a method and a use. The statements on the individual aspects of the invention complement each other in this case. Explanations for one of the aspects apply equally to the other two aspects.

The above statements, like the following description of an exemplary embodiment, do not represent a waiver of specific embodiments or features.

The invention is explained in more detail below using an exemplary embodiment shown in the figures.

Fig.1

zeigt in isometrischer Darstellung von einer Seite einen Abschnitt im Bereich eines Antriebs einer Erdbohrvorrichtung mit einer Haspel und einer Kabelzuführung und

Fig. 2

die Darstellung der Fig. 1 von einer anderen Seite.

In the drawings shows:

Fig.1

shows in an isometric representation from one side a section in the area of a drive of an earth drilling device with a reel and a cable feed and

Fig. 2

the representation of the Fig. 1 from another side.

Figures 1 and 2 show in isometric representation from two sides a section in the area of a rotary leadthrough 1 for drilling fluid of an earth drilling device. The rotary feedthrough 1 has a connection 2 which rotates with it and which can be brought into connection with a rod section to be drilled. The connection 2 can be connected to a rear end of a rod section to be drilled again and connect the rod section to the drill rod that has already been drilled. The connection 2 defines a drill pipe axis L, which is indicated by a dashed line in the Figure 1 is shown.

A cable 3 used for cable-guided drilling is available as a cable store 4. A contact device 5 is provided on the cable store 4, which has an electrical contact that is electrically connected to one end of the cable 3 of the cable store 4. The contact device 5 is also connected to an electrical connection which forms a connection to a display or a unit processing a signal that is present on the cable 3. The cable supply 4 is designed as a reel 6 which can accommodate a cable 3 with a length of at least two rod sections. One end of the cable 3 of the cable supply 4 is guided into the axis L of the connection 2 via a cable feed 7.

The cable feed 7 has guide rollers 8 designed as deflection rollers, by means of which the cable 3 can be fed to the connection 2 from behind. To this end, the reel 6 is arranged on the rotary feedthrough 1 or the connection 2. The central axis of the reel 6 is aligned concentrically to the central axis of the connection 2, which coincides with the drill rod axis L. In this way, the cable 3 is passed through the connection 2 and can protrude from the connection 2 at the other end in order to be connected to a cable of a drill rod that has already been drilled.

In the area of the guide roller 8, which aligns the cable essentially in the longitudinal axial direction of the connection 2, there is a seal 9 which can close an opening 10. For this purpose, a cylinder 15 connected to the seal 9 can be subjected to pressure.

A traction means 11 is provided, with which the cable supply 4 is functionally connected by means of two meshing gear wheels 12, 13. The traction means 11 is functionally connected to the cable store in such a way that it can hold the cable 3 of the cable store 4 under tension. The traction means 11 is designed as a hydraulic motor.

To supply rinsing liquid, in particular bentonite, a rinsing liquid feed 14 is provided on the rotary leadthrough 1.

Claims (10)

Earth drilling device for cable-guided drilling with a drive for connecting and / or moving rod sections of a drill rod along a drill rod axis (L), characterized by a cable supply (4) for receiving a cable (3) with a length of at least two rod sections and a contact device ( 5) for making electrical contact with one end of the cable (3) of the cable supply (4). Earth drilling device according to Claim 1, characterized in that the cable supply (4) has a reel (6). Earth drilling device according to Claim 2, characterized in that the reel (6) is arranged around the drill rod axis (L). Earth drilling device according to one of Claims 1 to 3, characterized in that there is a cable feed (7) with at least one guide roller (8). Earth drilling device according to Claim 4, characterized in that the cable feed (7) is designed for an axial feed into the drill rod axis (L). Earth drilling device according to Claim 4 or 5, characterized in that a seal (9) is provided on the cable feed (7) for sealing against flushing liquid which can be fed to the drill rod. Earth drilling device according to one of Claims 1 to 6, characterized in that the cable supply (4) is at a distance on the end of a rotary feedthrough (1) from the connection (2) coming into connection with the rod sections. Earth drilling device according to one of claims 1 to 7, characterized in that a traction means (11), in particular in the form of a hydraulic motor, is present, which is functionally connected to the cable supply (4) and is designed to keep the cable (3) under tension . A method for cable-guided earth drilling, comprising the step: connecting a rod section, which is part of a drill rod drilled in the ground and in which a cable (3) is present, with a further rod section, characterized by providing a cable (3) with a length of at least two rod sections and establishing a permanent electrical contact of one end of the cable (3) with a length of at least two rod sections while connecting rod sections. Use in cable-guided earth drilling, in which rod sections are used in which a cable (3) is arranged, cables (3) of adjacent rod sections are connected to one another, characterized in that a cable supply (4) for receiving a cable (3) with a Length of at least two rod sections and a contact device (5) for constant electrical contact with one end of the cable (3) of the cable supply (4) can be used.

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