Drill string, connection system, earth drilling device and method to connect a drill string section

Abstract

A drill string section includes at least one plug-and-rotate seat (bayonet seat) for interacting with a (bayonet) catch, wherein the seat allows an additional plug-in step for fixing the catch in a connection secure against rotation in both directions of rotation about the longitudinal axis of the drill string section.

Claims

1. A drill string section having a longitudinal axis and a plug-and-rotate seat for interacting with a catch, and an additional plug-in step for fixing the catch in a connection secure against rotation in both directions of rotation about the longitudinal axis of the drill string section, wherein the plug-and-rotate seat is configured to permit axial and radial motion of the catch relative to the seat, and wherein the additional plug-in step is configured to permit axial motion of the catch relative to the step independent of the axial and radial motion permitted by the plug-and-rotate seat.

2. The drill string section according to claim 1, wherein the seat comprises an aligning section, a rotating section and a paddle section.

3. The drill string section according to claim 1, wherein the seat has at least one axial contact surface and at least one paddle surface for the catch.

4. The drill string section according to claim 3, wherein two paddle surfaces are formed which are arranged at an angle offset to the longitudinal axis of the drill string section.

5. The drill string section according to claim 2, wherein the aligning section is configured to align the drill string section with the catch along the longitudinal axis, which section has a projection in an angular range about the longitudinal axis of the drill string section relative to the rotating section in which the catch is rotatable about the longitudinal axis of the drill string section.

6. The drill string section according to claim 5, wherein the aligning section for aligning the drill string section along the longitudinal axis is configured to be symmetrical.

7. The drill string section according to claim 5, wherein a longitudinal axial extension of the rotating section in which the catch is rotatable about the longitudinal axis of the drill string section substantially corresponds with the longitudinal axial extension of an inner contour of the catch.

8. The drill string section according to claim 1, further comprising an earth drilling device coupled to the drill string section for driving the drill string section.

9. A drill string section having a longitudinal axis and a plug-and-rotate seat for interacting with a catch, and an additional plug-in step for fixing the catch in a connection secure against rotation in both directions of rotation about the longitudinal axis of the drill string section, wherein the plug-and-rotate seat is configured to permit axial and radial motion of the catch relative to the seat and comprises an aligning section, a rotating section and a paddle section, and wherein the rotating section in which the catch is rotatable about the longitudinal axis of the drill string section has a longitudinal movement stop surface and a rotating movement stop surface which are arranged such that the catch, when brought into contact with the rotating movement stop surface, is out of contact with the longitudinal movement stop surface, and the catch is pluggable relative to the paddle section, and wherein the additional plug-in step is configured to permit axial motion of the catch relative to the step independent of the axial and radial motion permitted by the plug-and-rotate seat.

10. The drill string section according to claim 9, wherein the seat has at least one axial contact surface and at least one paddle surface for the catch.

11. The drill string section according to claim 10, wherein two paddle surfaces are formed which are arranged at an angle offset to the longitudinal axis of the drill string section.

12. The drill string section according to claim 9, wherein the aligning section is configured to align the drill string section with the catch along the longitudinal axis, which section has a projection in an angular range about the longitudinal axis of the drill string section relative to the rotating section in which the catch is rotatable about the longitudinal axis of the drill string section.

13. The drill string section according to claim 12, wherein the aligning section for aligning the drill string section along the longitudinal axis is configured to be symmetrical.

14. The drill string section according to claim 12, wherein a longitudinal axial extension of the rotating section in which the catch is rotatable about the longitudinal axis of the drill string section substantially corresponds with the longitudinal axial extension of an inner contour of the catch.

15. A connection system of an earth drilling device for connecting a drill string section, the system comprising a catch and a drill string section having a longitudinal axis and a plug-and-rotate seat for interacting with the catch, and an additional plug-in step for fixing the catch in a connection secure against rotation in both directions of rotation about the longitudinal axis of the drill string section, wherein the plug-and-rotate seat is configured to permit axial and radial motion of the catch relative to the seat, and wherein the additional plug-in step is configured to permit axial motion of the catch relative to the step independent of the axial and radial motion permitted by the plug-and-rotate seat.

16. The connection system according to claim 15, wherein the catch is formed on a drive and/or on another drill string section.

17. A method to connect a drill string section to a catch, comprising: plugging in the drill string section relative to the catch in the longitudinal direction of the drill string section; rotating the drill string section relative to the catch about the longitudinal axis of the drill string section; and after rotating the drill string section relative to the catch, plugging in the drill string section relative to the catch in the longitudinal direction of the drill string section, wherein the catch is brought into contact with the drill string section such that a connection secure against rotation is formed in both directions of rotation relative to the longitudinal axis of the drill string section.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained in greater detail below based on an exemplary embodiment shown in the drawings:

(2) In the drawings:

(3) FIG. 1 shows an isometric representation of an end-side area of a drill string section and a catch;

(4) FIG. 2 shows the catch and the end-side area of the drill string section according to FIG. 1 in a mounted position in an isometric representation;

(5) FIG. 3 shows a front view of the catch mounted on the drill string section according to FIG. 2;

(6) FIG. 4 shows a side view according to FIG. 2 and a sectional view; and

(7) FIG. 5 shows a side view and sectional views of the catch and the drill string section after the formation of a connection secure against rotation.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

(8) FIG. 1 schematically portrays an end-side area of a drill string section 1 which has a seat 2 that comprises a plug-and-rotate seat 3. Furthermore, the seat 2 has a section 4 which permits an additional plug-in step for fixing a catch 5, wherein in the additional plug-in step, the catch 5 is positioned relative to the drill string section 1 and the seat 2 of the drill string section 1 such that the catch 5 lies against the drill string section 1 in a nonrotating manner in both directions of rotation.

(9) The end-side area of the drill string section 1 has a conical end 6 which abuts an aligning section 7. On the end 6, an outer thread can be formed which is designed to correspond with an inner thread of another drill string section. At a distance from the depicted end of the drill string section 1, a rotating section 8 is formed on which a paddle section 9 is formed at a still greater distance from the end of the drill string section 1.

(10) In FIG. 2, the catch 5 is shoved onto the seat 2 of the drill string section 1, and the aligning section 7 is positioned in an inner contour of the catch 5 such that there is a free passage for the aligning section 7 in the catch 5, and the catch 5 can be rotated relative to the drill string section 1 about the longitudinal axis of the drill string section 1. In the position of the catch 5 and drill string section 1 shown in FIG. 2, the drill string section 1 contacts the catch 5. A longitudinal movement stop surface 10 on the drill string section 1 limits the axial movement of the catch 5 while mounting, and serves as a contact when rotating. The rotation of the catch 5 relative to the drill string section 1 is limited by a rotational movement stop surface 14.

(11) FIG. 3 shows the drill string section 1 from the front with the catch 5 in the position from FIG. 2.

(12) FIG. 4 shows a side view of the catch 5 shoved on to the drill string section 1, as well as a sectional representation along plane A-A.

(13) FIG. 5 shows the catch 5 with the drill string section 1 after a rotation of the catch 5 relative to the drill string section 1 about the longitudinal axis of the drill string section 1, and an advancement of the catch 5 relative to the drill string section 1 in a side view and a sectional representation along the planes B-B, C-C and D-D indicated in the sectional representation. In the position of the drill string section 1 relative to the catch 5 shown in FIG. 5, the cutout in the catch 5 and the projections 11 formed on the aligning section 7 are no longer flush with each other so that, when the catch 5 is subject to tension relative to the drill string section 1, a tension-resistant connection exists. Under tension, the catch 5 contacts the projections 11 formed on the aligning section 7.

(14) Furthermore, in the position shown in FIG. 5, a connection secure against rotation in both directions is formed between the catch 5 and the drill string section 1. The drill string section 1 has two paddle surfaces 12 which are in contact with rotational movement catch surfaces 13 formed on the catch 5.