Kit, drill tube, drill string and method of making or refinishing a drill tube of a drill string

Abstract

Installation kit for drill pipes (6) of a string of pipes, in particular of a drill string, having a first end (17) and a second end (18), which are connected to one another by means of at least one connecting line (13). One of the two ends (18) is arranged in a pin (3) of the drill pipe (6) and the other end (17) is arranged in a box (1) of the drill pipe (6). Arranged at the first end (17) and / or the second end (18) is a seal (23), which seals the first end (17) in relation to the second end (18) of an installation kit (7) which is to be connected, and arranged on the circumferential surface (11) of each end (17, 18) is a sealing element (20), which seals the respective end (17, 18) in relation to the pin (3) or the box (1).

Description

[0001] The invention relates to an installation kit for drill strings of a pipe string, in particular a drill string, a drill string of a pipe string, in particular a drill string, and a pipe string, in particular a drill string.

[0002] The invention further relates to a method for manufacturing or reworking a rod tube.

[0003] WO 92 / 04525 A1 discloses an installation kit as described in the preamble of claim 1.

[0004] A key element in modern drilling processes, particularly in oil, gas, and geothermal drilling, is data acquisition and the control of the various modules of the drill string during the drilling operation, as well as the power supply for electrical modules within the drill string. The same applies to the subsequent oil, gas, or hot water production, to which this invention also relates. The drilling industry therefore requires a system that enables electrical power transmission and / or electrical or optical data transmission during the drilling or production process.

[0005] Such a system should be as independent as possible from the structural design of the boom tubes, so that both new boom tubes and existing boom tubes can be equipped with it.

[0006] This problem is solved according to the invention with a mounting kit having the features of claim 1.

[0007] This problem is further solved with a drill string having the features of claim 12 and with a pipe string, in particular a drill string, having the features of claim 15.

[0008] The installation kit according to the invention has a first end and a second end, which are connected to each other by means of at least one connecting line. One of the two ends is arranged in a pin of the linkage tube and the other end in a box of the linkage tube. To seal one end of an installation kit in a linkage tube against the other end of an installation kit to be connected, a seal is arranged at the first end and / or at the second end. Finally, a sealing element is arranged on the circumferential surface of each end, sealing the respective end against the pin or the box. This makes it possible to equip or retrofit linkage tubes of virtually any design in such a way that an electrical, optical and / or hydraulic data and / or supply line can be installed that is largely independent of the actual linkage tube.that the linkage tubes and their connections with subsequent linkage tubes via a pin and a box do not need to be changed when they are fitted out or retrofitted with an installation kit according to the invention.

[0009] As claimed by the inventive method according to claim 18, it is only necessary to create a suitable receptacle within the pin and the box in a new or an existing, old linkage tube by machining the inner surface of the tube in this area so that the two ends of the installation kit can be reliably and tightly received.

[0010] All seals, sealing elements and gaskets are designed according to the invention in such a way that they comply with the safety regulations in connection with electric current on drilling rigs and therefore no further safety measures need to be taken.

[0011] Further preferred embodiments of the invention are the subject of the dependent claims.

[0012] According to the invention, the connecting line between the two ends could itself be a suitably protected electrical, optical, or hydraulic line, but is preferably a tube in which an electrical or optical line is or can be accommodated. Of course, empty conduit is also possible.

[0013] In a further preferred embodiment of the invention, the connecting line, and in particular the tube, is connected at both ends to a cable channel in each end. This allows the connecting line, or the electrical or optical line arranged in the connecting line, to be reliably guided to a connection point between the adjoining ends of the installation kits or rod tubes.

[0014] In particular, the invention prefers that one end of the installation kit has a socket and the other end a spigot end, and that a seal is arranged between the socket and the spigot end. The interlocking of the socket and spigot end ensures both a mechanically stable connection and a highly reliable seal between the two ends being joined.

[0015] In a preferred embodiment of the invention, the tip end can have a first and a second longitudinal section, wherein the first longitudinal section has a larger outer diameter than the second longitudinal section, wherein the at least one connecting line is connected to the conduit on the first longitudinal section, and wherein the conduit opens at a shoulder between the first and the second longitudinal section.

[0016] In a further preferred embodiment of the invention, the conduit opens at an end face of the socket, and the at least one connecting conduit is connected to the conduit at a side of the socket opposite the end face.

[0017] These two embodiments of the invention can be combined with each other, which offers the further possibility according to the invention that the front face of the sleeve and the shoulder are spaced apart from each other.

[0018] The space created between the spigot end, the socket, and a connecting rod tube can be used to accommodate at least one electrical, optical, hydraulic, or radio-technical device. In particular, electrical and / or optical devices, such as measuring instruments, as well as connections or couplings for linking the electrical and / or optical lines from one mounting kit to the next, can be installed in this space.

[0019] Further features and advantages of the invention will become apparent from the following description of a preferred embodiment of the invention, which does not limit the scope of protection, with reference to the accompanying drawings. These show: Fig. 1 a linkage tube, Fig. 2 an embodiment of an installation kit according to the invention, Fig. 3 the ends of the installation kit of Fig. 2 on an enlarged scale and in section, Fig. 4, into the linkage tube of Fig. 1 built-in installation kit according to Fig. 2 in a partial longitudinal section, Fig. 5 the built-in installation kit of Fig. 4 with further details, and Fig. 6 the connection area of ​​two drill string tubes of a drill string with an installation kit according to the invention in a partial section.

[0020] The drawings show an embodiment of an installation kit according to the invention, which is only exemplary and, apart from the features of the invention as defined in the claims, can also be designed differently with respect to many components within the scope of the present invention, without this needing to be mentioned in detail below.

[0021] In Fig. 1 Figure 6 shows a conventional embodiment of a linkage tube 6 with modifications according to the invention. It is understood that the linkage tube can also be constructed differently, unless specific features of the linkage tube 6 are indicated below as absolutely necessary.

[0022] In the illustrated embodiment, the drill string 6 has a tube body 2, at one end of which a pin 3 is arranged and at the other end a box 1. Preferably, but not necessarily, the box 1 and the pin 3 are welded to the tube body 2. An external thread or stud thread is provided on the pin 3 and an internal thread or socket thread is provided in the box 1, with both threads preferably being tapered threads. By screwing the stud thread on the pin 3 into the socket thread in the box 1, several drill strings 6 can be joined together to form a drill string, with this connection creating a sufficiently reliable seal between the inside and outside of the drill string.

[0023] The drill string 6 is open throughout its interior, so that when multiple drill strings 6 are screwed together, a channel 8 is formed through which, for example, drilling fluid can be conveyed from the drilling rig at the surface to the drill head. If the drill string 6 is not a drill string, but rather a pipeline for conveying, for example, oil, gas, or water, this substance can be conveyed upwards through the channel 8 inside the drill string 6.

[0024] In the illustrated embodiment, preferably cylindrical bores 4, 5 are located in the area of ​​the box 1 and the pin 3, into which a first end 17 and a second end 18 of an installation kit 7 according to the invention are inserted.

[0025] In the installation kit 7 according to the invention, as shown in the drawings, the two ends 17, 18 are connected by means of two connecting lines 13. Of course, more than two connecting lines or only a single connecting line may also be present. The connecting lines 13 are tightly connected, for example by means of a seal 37, to conduit channels 16 in the ends 17, 18.

[0026] On the side opposite the connecting lines 13, one end 17 has a socket 19 and the other end 18 has a spigot 20. The socket 19 and the spigot 20 are compatible and can be inserted into one another, thus creating a connection between two adjoining installation kits 7. To ensure a tight connection between the socket 19 and the spigot 20, the socket 19 has an inner wall section 21 and the spigot 20 has an outer wall section 22. The inner wall section 21 and the outer wall section 22 are preferably cylindrical, but can also be conical or concave / convex. A sealing ring 23 is arranged on the outer wall section 22 of the spigot 20. When the socket 19 and the spigot 20 are inserted together, a tight connection is created between one installation kit 7 and an adjoining installation kit 7 via the sealing ring 23.

[0027] Alternatively, in the invention it is also possible that the seal is not a separate part like a sealing ring, but is formed by two sealing surfaces arranged on the socket 19 and on the spigot end 20, which are in contact with each other under pressure, whereby the seal is produced by the sealing surfaces on the socket 19 and the spigot end 20.

[0028] In the sleeve 19, the conduit 16 leads from the connecting conduit 13 through the interior of the sleeve 19 to an end face 24, which is opposite the connecting conduit 13.

[0029] The tip 20 has a first longitudinal section 25 and a second longitudinal section 26, both of which are essentially cylindrical. The first longitudinal section 25 has a larger outer diameter than the second longitudinal section 26. A shoulder 27 is formed at the transition between the first longitudinal section 25 and the second longitudinal section 26. In the tip 20, the conduit 16 leads from the connecting conduit 13 through the interior of the tip 20 to the shoulder 27 and opens there.

[0030] The distance of the opening of the conduit 16 at the end face 24 of the socket 19 and the opening of the conduit 16 at the shoulder 27 of the tip end 20 from a longitudinal axis of the installation set 7 is preferably essentially the same, although different distances are of course also possible.

[0031] In the illustrated embodiment of the installation kit 7 according to the invention, the shoulder 27 of the spigot end 20 and the end face 24 of the socket 19 have a distance large enough to form a space 15 in which electrical and / or optical components can be arranged. These components can be, for example, sensors and electrical or electromagnetic connections or couplings through which electrical energy transfer and / or electrical or optical data transmission can take place when the socket 19 and the spigot end 20 are connected.

[0032] For example, the device for connecting electrical lines described in EP 2 440 737 B1 can be installed in room 15 in order to connect electrical lines led through the connecting lines 13 and the line channels 16 of adjoining rod tubes 6 or installation sets 7.

[0033] The ends 17, 18 are sealed to the rod tube 6 by means of sealing sleeves 9, 14, which are integrated into the socket 19 and the spigot end 20 or tightly connected to them. The sealing sleeves 9, 14 have a circumferential surface 11 with a cylindrical shape, on which a sealing element 28 is arranged.

[0034] To secure the ends 17, 18 in pin 3 and box 1, a clamping device 29 is provided, which essentially consists of two sleeves 10, 12 that are axially displaceable relative to each other. Each of the sleeves 10, 12 has a wedge surface 31, 32 on the side facing the other sleeve 10, 12. Wedges 33 are arranged regularly around the circumference between the two sleeves 10, 12, and these wedge surfaces correspond to the wedge surfaces 31, 32. The sleeves 10, 12 can be clamped against each other by means of screws 34, which displaces the wedges 33 radially outwards and clamps the clamping device 29 in pin 3 and box 1, respectively. The clamping devices 29, more precisely their sleeve 10 arranged on the side of the socket 19 or the spigot end 20, also have spring-loaded projections 35 which can engage in recesses 36 in the socket 19 or the spigot end 20.

[0035] The assembly of a mounting kit 7 according to the invention can be carried out, for example, by first inserting a clamping device 29 into the pin 3 and the box 1 of a linkage tube 6. The connecting lines 13 are then inserted into bores 38, 39, which are provided in the sleeves 10, 12, until they protrude beyond the sleeve 10. If necessary, the clamping devices 29 are then pulled slightly apart from each other to tension the connecting lines 13.

[0036] The screws 34 are then tightened, causing the sleeves 10, 12 to move towards each other and the wedges 33 to be pushed radially outwards until the clamping devices 29 are fixed in pin 3 and in box 1.

[0037] The electrical and / or optical cables can then be pushed through the connecting cables 13 and the cable channels 16 in the provided sleeve 19 and the spigot end 20. The sleeve 19 and the spigot end 20 are then inserted into the pin 3 and the sleeve 1 until the projections 35 engage in the recesses 36, thus firmly mounting the two ends 17, 18 in the rod tube 6.

[0038] When the two ends 17, 18 are fastened in the pin 3 and the box 1 as shown in the figures and described above, the space 15 is sealed to the environment (i.e., to the area outside the rod tubes 6 on the one hand and the channel 8 inside the rod tubes 6 on the other) by the seal 23 between the sleeve 19 and the spigot end 20, the sealing elements 28 between the circumferential surface 11 of each end 17, 18 and the pin 3 and the box 1, and the seal at the screw connection between the pin 3 and the box 1 of adjoining rod tubes 6, but remains open to the conduit channels 16. Since the conduit channels 16 are themselves well sealed against the connecting lines 13, there is no critical connection or leakage to the environment.

[0039] The installation kit according to the invention makes it possible to create a system solution that is largely independent of the geometry of the rod tubes 6, with which rod tubes 6 can be supplemented by the possibility of a tight and therefore safe way to lay electrical and optical cables.

[0040] The installation kit according to the invention can be used not only in the manufacture of new linkage tubes, but also for retrofitting older linkage tubes that have already been in operation for some time.

[0041] This only requires machining the inner surface of the tube in pin 3 and box 1 and creating cylindrical bores 4 and 5 into which the two ends 17 and 18 of the installation kit 7 fit precisely. Since this is a relatively simple machining step, it can be carried out not only in well-equipped workshops but also on-site using a drilling machine.

[0042] Furthermore, the installation kit 7 according to the invention makes it possible to rework the threads on pin 3 and in box 1, which is necessary at regular intervals due to wear or damage to the threads. In this case, it is only necessary to remove the installation kit 7 from a linkage tube 6, rework the threads, and reinsert the installation kit 7 into the linkage tube 6. Any necessary shortening of the connecting line 13 between the two ends 17, 18 due to a reduction in the length of the linkage tube 6 is also easily accomplished.

[0043] This means that the reworking of the threads of rod tubes 6 can also be carried out easily on site. Reference symbol list:

[0044] 1 Box 2 Tube body 3 Pin 4 Cylindrical bore 5 Cylindrical bore 6 Rod tube 7 Installation kit 8 Channel 9 Sealing sleeve 10 Sleeve 11 Circumferential area 12 Sleeve 13 Connecting line 14 Sealing sleeve 15 Space 16 Line channels 17 End 18 End 19 Socket 20 Spigot end 21 Inner wall area 22 Outer wall area 23 Sealing ring 24 Front face 25 First longitudinal section 26 Second longitudinal section 27 Shoulder 28 Sealing element 29 Clamping device 30-31 Wedge surface 32 Partial surface 33 Wedges 34 Screws 35 Projections 36 Recesses 37 Seal 38 Bore 39 Bore

Claims

1. Installation kit for hollow rods (6) of a pipe string, in particular a drill string, the installation kit having a first end (17) and a second end (18), which are connected to one another by means of at least one connecting line (13), wherein each end (17, 18) has a peripheral surface (11), wherein one of the two ends (18) can be arranged in a pin (3) of the hollow rod (6), and the other end (17) can be arranged in a box (1) of the hollow rod (6), wherein a seal (23) is arranged on the first end (17) and / or on the second end (18) sealing the first end (17) relative to the second end (18) of an installation kit (7) that is to be connected , and wherein a sealing element (28) that seals the respective end (17, 18) relative to the pin (3) or the box (1) is arranged on the peripheral surface (11) of each end (17, 18), characterized in that at least one end (17, 18), preferably both ends (17, 18), is / are fastened in the pin (3) or the box (1) by means of a clamping device (10, 12).

2. Installation kit according to claim 1, characterized in that the at least one connecting line (13) is connected to respectively one duct (16) in the ends (17, 18).

3. Installation kit according to claim 2, characterized in that the connecting line (13) is accommodated to move in the duct (16) in the longitudinal direction via a seal (37).

4. Installation kit according to one of claims 1 to 3, characterized in that one end (17) has a pipe coupling (19) and the other end (18) has a spigot end (20), and in that a seal (23) is arranged between the pipe coupling (19) and the spigot end (20).

5. Installation kit according to claims 2 and 4, characterized in that the spigot end (20) has a first longitudinal section (25) and a second longitudinal section (26), in that the first longitudinal section (25) has a larger outside diameter than the second longitudinal section (26), in that the at least one connecting line (13) is connected to the duct (16) on the first longitudinal section (25), and in that the duct (16) empties onto a shoulder (27) between the first longitudinal section (25) and the second longitudinal section (26).

6. Installation kit according to claims 2 and 4 or 5, characterized in that the duct (16) empties onto a front side (24) of the pipe coupling (19), and in that the at least one connecting line (13) is connected to the duct (16) on a side of the pipe coupling (19) that is opposite to the front side (24).

7. Installation kit according to claims 5 and 6, characterized in that the front side (24) of the pipe coupling (19) and the shoulder (27) are separated from one another.

8. Installation kit according to one of claims 1 to 7, characterized in that the peripheral surface (11) of at least one end (17, 18), preferably of both ends (17, 18), has a shape that is cylindrical at least in sections.

9. Installation kit according to claim 8, characterized in that the peripheral surface (11) on the spigot end (20) and / or on the pipe coupling (19) is arranged on a sealing sleeve (9, 14) that in each case surrounds the spigot end (20) and the pipe coupling (19), on which sleeve the sealing element (28) is arranged.

10. Installation kit according to one of claims 1 to 9, characterized in that the clamping device has two sleeves (10, 12) that can move in the axial direction and that can be screwed against one another, in that a wedge surface (31, 32) is arranged on at least one of the sleeves (10, 12), and in that wedges (33) that can move in the radial direction on the wedge surface (31, 32) are arranged between the sleeves (10, 12).

11. Installation kit according to one of claims 2 to 10, characterized in that at least one electrical, optical, or hydraulic line is arranged in the at least one connecting line (13) and the ducts (16), or in that the connecting line (13) is empty.

12. Hollow rod of a pipe string, in particular a drill string, with a pin (3) and a box (1) and a pipe body (2) arranged between the pin (3) and the box (1), characterized in that an installation kit (7) is arranged in the hollow rod (6) according to one of claims 1 to 11.

13. Hollow rod according to claim 12, characterized in that the pin (3) and the box (1) have cylindrical holes (4, 5), in which the ends (17, 18) of the installation kit (7) are accommodated.

14. Hollow rod according to claim 12 or 13, characterized in that at least one sealing ring, preferably two or more sealing rings, are arranged on at least one end (17, 18), preferably on two ends (17, 18), of the installation kit (7) as a sealing element (28).

15. Pipe string, in particular drill string, with at least two hollow rods (6) that are connected to one another with a pin (3) and a box (1) and a pipe body (2) arranged between the pin (3) and the box (1), wherein the pin (3) and the box (1) of interconnecting hollow rods (6) are connected tightly to one another, characterized in that the hollow rods (6) are designed according to one of claims 12 to 14.

16. Pipe string according to claim 15, characterized in that a space (15), preferably an annular space, is formed for accommodating at least one electrical, electronic, or optical system between the spigot end (20), the pipe coupling (19), and a hollow rod (6).

17. Pipe string according to claim 16, characterized in that the space (15) is sealed with respect to the environment, but remains open to the ducts (16), by the seal (23) between the first end (17) and the second end (18), the sealing elements (28) between the peripheral surface (11) of each end (17, 18), and the pin (3) and the box (1), as well as the packing between the pin (3) and the box (1) of interconnecting hollow rods (6).

18. Method for producing or reworking a hollow rod (6) of a pipe string, in particular a drill string, with a pin (3) and a box (1) and a pipe body (2) arranged between the pin (3) and the box (1), characterized in that an inside surface of a pipe is machined in the pin (3) and in the box (1), and in that then the installation kit (7) according to one of claims 1 to 11 is incorporated into the hollow rod (6).

19. Method according to claim 18, characterized in that the pin (3) and the box (1) have a thread, in that the thread is reworked, in that optionally the length of the connecting line (13) is adapted to the length of the hollow rod (6) that is shortened by the reworking, and in that then the installation kit (7) is incorporated into the hollow rod (6).

Images