Drill pipe for producing a piped extrusion hole

Description

[0001] The invention relates to a drill pipe for the production of a cased drill hole. Such drill holes, in the broadest sense, form a protective casing system in which the drill string must be protected as an inner tube for driving a machine, a drill head, a tool, or the like. Since such an inner string is sometimes many times longer than the length of the individual drill pipe, considerable coupling and threading work is necessary during the production of the drill string to form the protective casing system.

[0002] DE 10 2007 002 399 A1, for example, discloses a method and a device for producing such a cased drilled hole. This document describes in particular the production of a horizontal filter well. To produce a cased drilled hole extending horizontally from a well shaft for the installation of a filter string, a starter drill pipe is driven horizontally through an opening in the wall of the well shaft into the surrounding rock by a press located in the well shaft.Once the drilling has progressed to the point where the starter drill pipe has completely emerged from the well shaft, another drill pipe must be placed on top of the starter drill pipe to form the string bore, so that this too can be pressed out of the well shaft and into the rock using the press, whereby the starter drill pipe is also driven further into the rock.

[0003] Once the drilling process has progressed to the point where the starter casing has completely emerged from the casing shaft, the drilling must be interrupted so that a new casing can be attached to it. For this, the supply and discharge lines of the drill head—that is, the entire internal string leading to the drill head—must be disconnected to attach the new casing or thread it through the internal string. Only after the previously disconnected lines have been reconnected can the drilling process continue and the newly inserted casing, together with the starter casing, be driven further into the rock. This process is repeated until the borehole reaches the desired length for the horizontal filter well.

[0004] A disadvantage of this method for creating a drill string is that, to attach or install a new drill pipe, the pipe connections or the inner string to the drill head must be repeatedly interrupted in order to position or thread new drill pipes over the pipe connections. This is associated with a high expenditure of time and energy, making continuous drilling without interrupting the pipe connections to the drill head impossible.

[0005] Drill pipes according to the preamble of claim 1 are known from CN 104532836 A and CN 204210210 U, but these are not suitable for producing a cased drill hole. Rather, they are used in traditional anchor cable construction technology. In this process, three anchor cables are already guided along with the drill string during drilling and left in the borehole after the desired drilling depth is reached, while the drill string or pipe is withdrawn from the borehole. However, such drill pipes cannot accommodate an inner tube for guiding a drill head, tool, machine, or the like, as is necessary when producing a cased drill hole, where the drill bit is always an integral part of the arrangement and cannot be removed.

[0006] The object of the invention is therefore to provide a drill pipe with which drilling for the production of a drill string requires less time and less energy than drill pipes known from the prior art.

[0007] This problem is solved by a drill pipe for the production of a cased string bore with all the features of claim 1. Advantageous embodiments of the invention are found in the dependent claims.

[0008] The drill pipe according to the invention for the production of a cased drill hole is characterized in that it consists of at least two longitudinal elements which are connected to each other to form the drill pipe, wherein the at least two longitudinal elements have different fixing means in order to fix the at least two longitudinal elements against each other by means of locking elements and to connect them to form the drill pipe.

[0009] The inventive design of the drill pipe for producing a cased drill hole eliminates significant coupling and threading work, resulting in enormous time and energy savings. The entire drill string forms a protective casing system in which an inner pipe (e.g., drill string, coil tubing, internal power supply, etc.) must be protected, for example, for driving a machine, tool, drill head, or the like. These elements to be protected are also referred to as the inner string. Since this inner string has a length that is sometimes many times greater than the length of the individual drill pipe for the planned length of the borehole, the inventive drill pipe eliminates the coupling and threading work known from the prior art, which is both time-consuming and energy-intensive, when producing a cased drill hole or such a protective casing system.In addition to saving time and energy, the use of drill pipes according to the invention in the production of a cased string bore also results in a considerable economic advantage, since the time and energy savings naturally also lead to significantly lower costs for the production of such a string bore.

[0010] In order to achieve a captive fixation of the locking elements to the drill pipe, it is provided according to the invention that the locking element is designed as a closing plate and has trapezoidal openings whose longitudinal edges are chamfered, wherein the locking element is movable from an opening position to a shooting position and wherein in a closed position the undercuts of the longitudinal edges of the pairs of fixing means of the longitudinal elements engage behind.

[0011] This embodiment of the invention allows the locking elements, designed as closure plates, to be applied particularly well and easily to the drill pipe according to the invention. The trapezoidal shape and the undercut create a clamping effect that positions and fixes the at least two longitudinal elements relative to each other and connects them to the drill pipe. The anti-rotation and anti-slide mechanism also prevents the locking elements, designed as closure plates, from being unintentionally detached when the drill pipes according to the invention are connected.

[0012] Furthermore, the multi-part drill pipe according to the invention enables the quick and safe encasing of the inner strand and the low-interruption or uninterrupted operation or installation of the inner strand without the need for threading. Using drill pipes according to the invention to manufacture such a protective pipe system also makes it possible to provide a flexible inner strand on a reel, which can be continuously advanced without interruption. Such drill pipes can be used for both horizontal and vertical drilling. Areas of application and use cases include all activities in which working and protective strands are required or offer advantages.

[0013] As already mentioned, the drill pipe according to the invention consists of at least two longitudinal elements. It is generally advantageous if it consists of exactly two longitudinal elements. This embodiment of the invention has the advantage that the drill pipe according to the invention consists of only two individual longitudinal elements, which can be fixed against each other and connected to form the drill pipe by means of fixing and securing elements. In this embodiment, it is advantageously possible to fix only two longitudinal elements against each other in order to then connect them. However, it is also possible for the drill pipe according to the invention to consist of more than two longitudinal elements, which are fixed against each other by means of fixing and securing elements and connected to form the drill pipe.However, with more than two longitudinal elements, the effort required to manufacture the drill pipe is significantly greater than with a drill pipe consisting of only two longitudinal elements.

[0014] According to a first advantageous embodiment of the invention, the at least two longitudinal elements have different positioning means for positioning them axially relative to each other before they are joined to form the drill pipe. It is advantageous for the positioning means of one longitudinal element to engage with a positioning means of the other longitudinal element, wherein the positioning means are designed such that the longitudinal elements can no longer be displaced relative to each other in the longitudinal direction of the drill pipe. Advantageously, the engagement of the positioning means of one longitudinal element is positive-locking and, in the longitudinal direction of the drill pipe, also frictionally locked with the positioning means of the other longitudinal element to prevent displacement of the longitudinal elements relative to each other.

[0015] Furthermore, it is advantageous if these positioning means, together with the fixing means and the securing elements, form a smooth surface when the at least two longitudinal elements are connected to each other to form the drill pipe. Such an embodiment of the invention is therefore advantageous because it creates a substantially circular surface along the entire longitudinal extent of the drill pipe, from which no part of the drill string protrudes in the radial direction. This is particularly advantageous when advancing the drill string in rock, since such radial protrusions create additional resistance in the rock and would thus require increased energy expenditure to advance the drill string through the rock.

[0016] According to a further advantageous embodiment of the invention, each of the at least two longitudinal elements has connecting elements at opposite axial ends for joining different drill pipes to form a drill string. These connecting elements are also advantageously designed such that two interconnected drill pipes form a flat cylindrical surface which has no radial projections but a constant cylindrical radius. This also prevents radial projections from occurring in the drill string during its advance through the rock, which would otherwise result in increased resistance.This is also particularly advantageous compared to the state of the art, where rods and pipe connectors often have a conical thread, resulting in a thickening that protrudes radially beyond the cylindrical surface of the drill string, thus causing increased resistance during drilling in the rock and significantly increasing the energy required to advance the drill string.

[0017] To enable the connection of drill pipes according to the invention to prevent rotation, a further advantageous aspect of the invention provides that a locking device is detachably arranged on the drill pipe and is, in particular, fixed by the locking element. The locking device advantageously ensures that connected drill pipes cannot be twisted relative to each other or become detached from one another. Since this locking device is detachably arranged on the drill pipe when the two drill pipes are unconnected, it is advantageously fixed by the locking element when the two drill pipes are connected. This ensures that the locking device is permanently fixed to the drill pipe or the drill string.

[0018] According to a further advantageous embodiment of the invention, the locking device is designed to engage positively in a receptacle of another drill pipe or a locking element of another drill pipe. This positive engagement ensures that interconnected drill pipes are connected in a rotationally secure manner. It is advantageous if the engagement of the locking device in a receptacle of another drill pipe or a locking element of another drill pipe is not only positively engaged but also frictionally engaged in the radial direction. This frictionally engaged radial connection provides particularly effective protection against rotation and loosening between interconnected pipes.

[0019] To ensure that the locking elements of the at least two longitudinal elements permanently connect them, a further advantageous embodiment of the invention provides that an anti-displacement element for the locking element is arranged on at least one of the longitudinal elements. This anti-displacement element serves in particular to prevent the locking element from being displaced longitudinally along the drill pipe when the at least two longitudinal elements of the drill pipe according to the invention are connected and thus from detaching from the drill pipe. In a particular embodiment of the invention, the anti-displacement element is part of the anti-rotation element. This has the particular advantage that only one additional element is required to perform this dual function, acting as both an anti-rotation device for the drill pipe and an anti-displacement device for the locking element.

[0020] In a particularly advantageous embodiment of the invention, the fixing means of the at least two longitudinal elements form pairs that are trapezoidal in shape and have undercuts to the outer surface of the respective longitudinal element. Such longitudinal edges, in conjunction with the trapezoidal shape, are particularly well suited to permanently fixing the securing elements to the drill pipe.

[0021] It has proven advantageous that, in the closed position, the beveled longitudinal edges of the openings of the locking elements at least partially engage behind the undercuts of the longitudinal edges of the pairs of fixing means. This embodiment of the invention enables a particularly effective fixing of the locking elements to the drill tube according to the invention.

[0022] According to a further aspect of the invention, the longitudinal elements have milled recesses on their connecting sides in the area of ​​the fixing means, into which the securing element engages in such a way that the drill pipe has essentially the same radius over its entire longitudinal extent, with the particular absence of any radial projections in the area of ​​the securing elements. This embodiment of the invention also serves to prevent any radial projections from occurring in the drill string, which would entail a higher energy expenditure for advancing the drill string further into the rock.

[0023] According to a further aspect of the invention, two longitudinal elements to be joined can be connected along their longitudinal extent in their connection area by means of a tongue-and-groove joint. One longitudinal element has a groove into which a tongue of the other connecting element engages. The tongue and groove can be designed such that at least the groove or the tongue is provided with a sealing element, so that the connection of the two longitudinal elements is liquid-tight along its entire longitudinal extent.

[0024] Further objectives, advantages, features, and applications of the present invention will become apparent from the following description of exemplary embodiments with reference to the drawings. All features described and / or illustrated, individually or in any meaningful combination, constitute the subject matter of the present invention, even independently of their compilation in the claims or their cross-references.

[0025] They show: Figure 1: an embodiment of a drill pipe according to the invention, which is already connected to a starter drill pipe to form a drill string; Figures 2 to 10: chronological sequence for extending the drill string Figure 1 with a further drill pipe according to the invention Figure 1 Figure 11: a cross-sectional view of a drill pipe according to the invention Figures 1 to 10in the area of ​​fixing means and Figure 12: a cross-sectional view of an embodiment of a drill pipe according to the invention in the connection area of ​​two longitudinal elements.

[0026] In the Figure 1 A drill string 100 is shown, consisting of a starter drill pipe 101 and a drill pipe 1 according to the invention connected thereto. The drill pipe 1 according to the invention essentially consists of two longitudinal elements 2 and 3 connected to each other. The longitudinal elements 2 and 3 have different fixing means 4, 5, 6, by means of which the two longitudinal elements are fixed against each other before being connected and are positioned exactly relative to each other by means of positioning means 8 and 9 and subsequently connected with a locking element 7 designed as a closing plate 17.

[0027] On the in the Figure 1On the side of the drill pipe 1 that is not visible, the two longitudinal elements 2 and 3 are connected accordingly.

[0028] At its ends 10 and 11, the drill pipe 1 is provided with connecting elements 12 and 13 for attaching a further drill pipe according to the invention or for connecting it to the starter drill pipe 101 to form the drill string. A locking element 14 is provided which prevents the connection between the drill pipe 1 and the starter drill pipe 101 from becoming detached. The locking element 14 engages in a receptacle of the starter drill pipe 101 in a form-fitting and force-fit manner and is secured against detachment by the locking element 7, which is designed as a sealing plate. This ensures that the locking element 14 is permanently secured between the drill pipe 1 and the starter drill pipe 101. The locking element 14 not only prevents the drill pipe 1 from becoming detached from the starter drill pipe 101, but also prevents them from twisting relative to each other.

[0029] The Figures 2 to 10The figures now show the chronological sequence for the extension of the drill string 100, wherein a further drill pipe 1 according to the invention is connected to the drill string 100. Figure 1 is connected.

[0030] This involves, as it is in Figure 3 As shown, a lower longitudinal element 2 is connected to an upper longitudinal element 3 before it is connected in a further step to the existing drill string 100, consisting of the starter drill pipe 101 and a drill pipe 1 according to the invention.

[0031] In the presentation of the Figure 3 The fixing elements 4 and 6 of the upper longitudinal element 3 and the fixing elements 5 and 6 of the lower longitudinal element 2 are clearly visible. The fixing elements 4 of the upper longitudinal element 3 have positioning elements 8 that can engage with corresponding positioning elements 9 of the fixing elements 5 of the lower longitudinal element 2.

[0032] Furthermore, in the Figure 3The connecting means 12 and 13 are visible on the additional drill pipes 1 to be connected to the existing drill string 100, with the help of which the drill pipes 1 can be connected to each other in a form-fitting manner and secured against axial displacement in a process step yet to be described.

[0033] Furthermore, the upper longitudinal element 3 has a displacement protection element 15 for the locking element 7, designed as a locking plate 17, of the drill pipe 1 already connected to the starter drill pipe 101. When the two drill pipes 1 are connected, this prevents the locking element 7, designed as a locking plate 17, of the drill pipe 1 already connected to the starter drill pipe 101 from coming loose. Furthermore, the illustration of the Figure 3 The recordings 18 at both ends 10 and 11 of the lower longitudinal element 2 are already visible, into which a locking device for protection against twisting and loosening of the two drill pipes 1 can be inserted.

[0034] In the presentation of the Figure 4 The two longitudinal elements 2 and 3 of the drill pipe 1, which is to be connected to the drill string 100, are now joined at their longitudinal edges, with the positioning means 8 of the fixing means 4 of the upper longitudinal element 3 engaging in the positioning means 9 of the fixing means 5 of the lower longitudinal element. The fixing means 4, 5 and 6, as well as the positioning means 8 and 9, now secure the two longitudinal elements 2 and 3 against axial displacement relative to each other.

[0035] The Figure 5 The drill pipe 1, which is to be connected to the drill string 100, is now shown. Figure 4how its connecting elements 12 and 13 at its end 11 engage with the corresponding connecting elements 13 and 12 of the drill pipe 1 already connected to the starter drill pipe 101. Here, the upper longitudinal element 3 and the lower longitudinal element 2 are already positioned relative to the drill pipe 1, but not yet fixed against each other. Also clearly visible in this illustration is the anti-displacement element 15 of the drill pipe 1 to be connected to the drill string 100, which prevents displacement and thus loosening of the locking element 7, designed as a sealing plate 17, of the drill pipe 1 already connected to the starter drill pipe 101.

[0036] In a further step, which in Figure 5As shown, a securing device 14 is now inserted into the receptacle 18 in the connection area of ​​the two drill pipes 1. The securing device 14 engages with a portion of the securing element 7, designed as a sealing plate 17, of the drill pipe 1 already connected to the starter drill pipe 101. This is clearly visible in the illustration. Figure 5 also the anti-displacement element 15, which prevents the locking element 7 designed as a closing plate 17 of the drill pipe 1 already connected to the starter drill pipe 101 from being displaced and thus loosened.

[0037] In the Figure 6 and 7 The figure now shows how the safety device 14 is fully inserted into the receptacle 18 and is thereby in the final or closed position according to Figure 7 the locking element 7, designed as a closing plate 17, engages the underside of the drill pipe 1 connected to the starter drill pipe 101.

[0038] The safety device 14 is designed such that, in its final position as shown in Figure 7, it forms a flat surface with the outer surface of the two pipes, so that no radial protrusions occur in the area of ​​the safety device 14. Such radial protrusions would make it more difficult to advance the drill string 100 through the rock and would result in increased energy expenditure.

[0039] Figure 8 Figure 1 now shows the locking elements 7, designed as locking plates 17, with which the two longitudinal elements 2 and 3 are permanently connected to each other at their longitudinal edges. Trapezoidal openings 16 of the locking elements 7, designed as locking plates 17, are clearly visible, into which the pairs of fixing means 4, 5 and 6 of the longitudinal elements 2 and 3 subsequently engage, whereby the locking element 7 can be moved from an open position to a closed position.

[0040] The Figure 9The figure then shows the locking element 7, designed as a closure plate 17, arranged in an open position. As can be seen from this, the pairs of fixing means are also trapezoidal, with these trapezoids being smaller than the trapezoidal openings 16 of the locking element 7 designed as a closure plate 17.

[0041] The pairs of fixing means 4, 5 and 6 also have longitudinal edges 19 which have a chamfer towards the surface of the respective longitudinal element 2, 3 which is not visible here and will be described in more detail later.

[0042] In the Figure 10 The locking element designed as a locking plate 17 is now removed from the opening position of the Figure 9moved into the closed position. In this closed position, the locking element 7 now also engages the locking device 14, so that it is captive and fixed between the two connected drill tubes 1. In the closed position according to Figure 10 The trapezoidally shaped pairs of fixing means 4, 5 and 6 not only form a positive fit with the trapezoidal openings 16 of the closure element 7 designed as a closure plate 17, but also, through an undercut 21 of the longitudinal edges 19, which, through chamfered longitudinal edges 20 of the openings 16, also form a force fit in the radial direction of the drill pipe 1 now arranged on the drill string 100.

[0043] This undercut 21 is shown again in the illustration of the Figure 11Explicitly visible, which shows a cross-sectional view in the area of ​​the locking element 7, designed as a closing plate 17, and the fixing means 6 of the longitudinal elements 2 and 3 in a closed position of the locking element 7. This explicitly clarifies the radial form and force fit, so that the drill pipe 1, now connected to the drill string 100, is captive and connected to the drill pipe already connected to the starter drill pipe 101.

[0044] The two longitudinal elements 2 and 3 are fixed against each other by the fixing means 6, and the chamfered longitudinal edges 20 of the opening 16 of the securing element 7 engage behind the undercuts 21 of the longitudinal edges 19 of the fixing means 6. Because the securing element 7 is secured against displacement, as described above, the two longitudinal elements 2 and 3 of the drill pipe 1 are securely fixed against each other. An analogous securing mechanism also exists in the areas of the fixing means 4 and 5, which are not shown in cross-section here.

[0045] Figure 12Figure 1 shows a cross-sectional view of an embodiment of a drill pipe according to the invention in the connection area of ​​two longitudinal elements 2, 3 in the area of ​​fixing elements 6. The two longitudinal elements 2, 3 to be joined are connected to each other along their entire longitudinal extent in their connection area by a tongue-and-groove joint. One longitudinal element 3 has a groove 23 into which a spring 22 of the other connecting element 2 engages. The groove 23 and spring 22 can be designed such that at least the groove 23 or the spring 22 is provided with a sealing element, so that the connection of the two longitudinal elements 2, 3 is liquid-tight along its entire longitudinal extent. Also visible in this illustration are the locking elements 7, designed as closure plates 17, for the longitudinal elements 2, 3. Reference symbol list

[0046] 1 Drill pipe 2 Longitudinal element 3 Longitudinal element 4 Fixing element 5 Fixing element 6 Fixing element 7 Securing element 8 Positioning element 9 Positioning element 10 End 11 End 12 Connecting element 13 Connecting element 14 Securing element 15 Displacement protection element 16 Opening 17 Closing plate 18 Receptacle 19 Longitudinal edge 20 Longitudinal edge 21 Undercut 22 Spring 23 Groove 100 Drill string 101 Starter drill pipe

Claims

1. Drill pipe (1) for producing a drill string, comprising at least two longitudinal elements (2, 3) which are connected to one another to form the drill pipe (1), wherein the at least two longitudinal elements (2, 3) have different fixing means (4, 5, 6) in order to fix the at least two longitudinal elements (2, 3) against one another by means of securing elements (7) and to connect them to one another to form the drill pipe (1), characterized in that the securing elements (7) are designed as closure plates (17) and have trapezoidal openings (16) into which the pairs of fixing means (4, 5, 6) of the longitudinal elements (2, 3) engage, wherein the securing elements (7) are displaceable from an open position into a closed position.

2. Drill pipe (1) according to claim 1, characterized in that the at least two longitudinal elements (2, 3) have different positioning means (8, 9) in order to position the at least two longitudinal elements (2, 3) axially relative to one another before connecting them to the drill pipe (1).

3. Drill pipe (1) according to claim 1 or 2, characterized in that each of the at least two longitudinal elements (2, 3) have connecting elements (12, 13) at opposite axial ends (10, 11) in order to connect different drill pipes (1) to a drill string (100).

4. Drill pipe (1) according to one of the preceding claims, characterized in that a securing means (14) is detachably arranged on the drill pipe (1) and is advantageously fixed by one of the securing elements (7).

5. Drill pipe (1) according to claim 4, characterized in that the securing means (14) forms the rotation-locking element and is configured to engage in a receptacle of a further drill pipe (1) and / or in a securing element (7) of a further drill pipe (1) in a form-fitting manner.

6. Drill pipe (1) according to one of the preceding claims, characterized in that at least one of the longitudinal elements (2, 3) is provided with a displacement protection element (15) for the securing element (7).

7. Drill pipe (1) according to one of the preceding claims, characterized in that the fixing means (4, 5, 6) form pairs that are trapezoidal in shape and have longitudinal edges (19) which, towards the outer circumferential surface of the respective longitudinal element (2, 3), are formed with an undercut (21).

8. Drill pipe (1) according to claim 7, characterized in that, in the closed position, the longitudinal edges (19) of the pairs of fixing means (4, 5, 6), which are provided with an undercut (21), are at least partially engaged behind by the bevelled longitudinal edges (20) of the securing element (7).

9. Drill pipe (1) according to one of the preceding claims, characterized in that the longitudinal elements (2, 3) have milled recesses on their connecting sides in the region of the fixing means (4, 5, 6), into which the securing element (7) engages such that the drill pipe (1) has the same radius over its entire longitudinal extent.