WO2007019594A1

WO2007019594A1 - Method and device for releasing a block on a bore-crown during a boring process

Info

Publication number: WO2007019594A1
Application number: PCT/AT2006/000338
Authority: WO
Inventors: Josef Mocivnik
Original assignee: Alwag Tunnelausbau Gesellschaft M.B.H.
Priority date: 2005-08-19
Filing date: 2006-08-11
Publication date: 2007-02-22
Also published as: US20090133934A1; AU2006281954A1; RU2391480C2; RU2008110501A; KR20080038341A; CA2619175C; CA2619175A1; AU2006281954B2; JP2009504950A; EP1915505B1; EP1915505B8; EP1915505A1; ZA200801213B; PL1915505T3

Abstract

The invention relates to a method and a device for releasing a block on a bore-crown (1) during a boring process, especially percussion boring or rotary percussion boring, for boring holes in the ground or rock, whereby a borehole is formed by a bore-crown (1) mounted on a boring rod (2) and connected thereto and acted upon by the boring rod to generate a rotational movement and optionally a percussive movement. According to the invention, when the bore-crown (1) is blocked, preventing the continuation of the boring process and especially another rotational movement of the bore-crown (1), the bore-crown (1) is subjected to a linear movement in the opposite direction to the boring direction by means of the boring rod (2), and to a rotational movement in a direction opposing the direction of the rotational displacement during the boring process by means of a corresponding connection (7, 9) between the end of the boring rod (2) facing the bore-crown (1), and the bore-crown (1), independently of a rotary drive for carrying out the boring process. As a result the borehole can be bored in a simple manner after releasing the block on the bore-crown (1).

Description

PROCESS IMD DEVICE FOR DISMISSING A BLOCKING OF A DRILLING CROWN WHILE DRILLING

The present invention relates to a method for overriding a blockage of a drill bit during drilling, in particular impact or rotary impact drilling, holes in soil or rock material, wherein by a mounted on a drill string and acted upon by the drill string to a rotational movement and optionally impact movement and a borehole is formed with this connected drill bit. The present invention further relates to a device for overriding a blockage of a drill bit during drilling, in particular impact or rotary impact drilling, holes in soil or rock material, a drill bit mounted on a drill string and through the drill string to a rotary motion and optionally impact movement to Training a borehole is acted upon.

In connection with the production of boreholes by impact or rotary impact drilling in soil or rock material, in particular in the case of soil or rock layers, which are displaceable or displaceable relative to one another, cases occur according to which, in particular due to forces introduced during drilling and vibration may result in jamming or seizing of the drill bit by shifting rock layer inside a wellbore. In such a case, usually the rotational drive of the drilling device for producing such a bore is not dimensioned sufficiently strong in order to be able to overcome forces occurring during a displacement of rock layers and thus prevent the blocked state of the drill bit. to cancel. In a favorable case succeeds in occurrence of such a blockage of the drill bit at least a separation of the drill string from the remaining unfinished drill hole drill bit, so that at least the drill pipe can be used to carry out a new drilling operation again. In unfavorable cases, the drill string must also remain in the unfinished wellbore, so that in addition to the fact that an increased time required to make a new well, which must be substantially adjacent to the unfinished well to achieve the required strength, is also a corresponding one Increased cost and material costs through the drill pipe remaining in the borehole and in each case left in the borehole drill bit occurs.

The present invention therefore seeks to provide a method and apparatus for overriding blockage of a drill bit during a drilling operation so that not only the additional time, cost and material required to make a new hole can be avoided, but that in a simple manner after lifting the blockage of the drill bit, the hole in the unfinished hole can be continued or completed.

To solve the above objects, a method of the type mentioned above is essentially characterized in that when a blockage of the drill bit, which prevents further drilling and in particular further rotation of the drill bit, the drill bit on the drill string of a linear movement against the Drilling direction and via a corresponding connection between the drill bit facing the end of the drill string and the drill bit and regardless of a rotary drive for performing the drilling operation is also subjected to a rotational movement in a direction opposite to the direction of rotational movement during the drilling operation. Characterized in that according to the invention in a blocking of the drill bit, the drill bit on the drill string not only a linear movement against the drilling direction, but also independent of a usually not sufficiently strong as mentioned above rotational drive in addition to a rotational movement in a direction opposite to the direction of rotation during is subjected to the drilling operation, can be solved by the at least partially retracting the drill bit against the drilling direction and achieving a simultaneous rotational movement, the jamming or seizing of the drill bit, so that after lifting the blockade or jamming of the drill bit subsequently By the blockage interrupted drilling process of unfinished borehole can be continued or completed. It is to be assumed here that the linear drive is strong enough to exert a sufficient extraction force on the drill string and thus subsequently on the drill bit against the drilling direction, so that it comes to a loosening of the drill bit in the linear direction of the borehole. In addition, by additionally providing the corresponding connection between the drill pipe and the drill bit, the drill bit is subjected to a rotational movement counter to the direction of rotation for carrying out the drilling operation, so that the drill bit can become detached from a wedged or blocked state, which can be caused, for example, by slight loading. caused by adjacent rock strata. By providing the rotational movement counter to the direction of rotation for carrying out the drilling operation, it is moreover ensured that no loosening of the drill bit from the drill string takes place and, after the blockage of the drill bit has been released, the drilling process can continue immediately.

For a particularly reliable and easy to produce connection for achieving the simultaneous rotational movement while exercising the extraction force on the drill string is proposed according to a preferred embodiment that the connection between the drill bit facing the end of the drill string and the drill bit via at least one helical or spiral Recess or flattening or elevation having adapter and a hiezu complementary profiling is performed on the drill bit, wherein the helical or spiral-like depression or flattening or elevation has a large inclination or slope to the longitudinal axis of the drill string. By providing a great slope or inclination to the longitudinal direction of the at least one helical or spiral connection or profiling, corresponding forces for achieving the rotational movement against the direction of rotation during the drilling process can be exerted against the drilling direction when a correspondingly high pull-out force is exerted on the drill pipe ,

In order to achieve correspondingly high forces for achieving the rotational movement for loosening or releasing the blockage of the drill bit and for a corresponding distribution over the outer circumference of the drill bit facing end of the drill string and / or adapter, which in a speaking complementary recess or a blind hole of the drill bit is proposed according to a further preferred embodiment that a plurality of helical or spiral-like compounds or profiles is provided, which are provided uniformly around the circumference of the drill bit facing the end.

In order to avoid excessive frictional forces in the region of the connection between the drill string and / or adapter and the drill bit, in particular during the movement process to cancel the blockage of the drill bit, it is proposed according to a further preferred embodiment that a merely pointwise engagement at several points in the region of the profilings is provided between the drill pipe or the adapter and the drill bit. Such a pointwise engagement in several places is sufficient for the transmission of necessary forces to achieve the simultaneous linear pull-out movement and the rotational movement against the rotational direction during drilling and allows, for example, in the region of the connection between the drill bit and the drill pipe or the adapter by excessive frictional forces the desired simultaneous linear pull-out movement and rotational movement can be achieved.

To solve the above-mentioned objects, a device of the type mentioned above is substantially characterized in that between the end facing the drill bit end of the drill string and the drill bit at least one spiral or helical connection is provided, which at a blocking of the drill bit in a Retracting the drill string opposite to the direction of drilling, the drill bit next to a linear movement ent against the drilling direction, the drill bit independently of a rotary drive for performing the drilling operation to a rotational movement in a direction opposite to the direction of rotation during the drilling process applied. As already stated above, it is thus possible in a simple and reliable manner to provide corresponding elements for exercising a simultaneously linear pull-out movement as well as a rotational movement counter to the direction of rotation when carrying out the drilling operation in order to eliminate blocking or jamming of the drill bit.

To achieve an easily manufacturable and precisely fitting embodiment, it is preferably proposed that the at least one spiral or helical connection is formed by a depression or elevation or flattening on an adapter interposed between the drill pipe and the drill bit and a complementary profiling on the drill bit.

For uniform introduction of force and possibly large forces is proposed according to a preferred embodiment, that a plurality of screw or spiral connections or profiles between the drill pipe and the adapter and the drill bit is provided, which are each uniformly spaced.

In order to enable a reliable transmission of the simultaneously acting extraction forces as well as the rotational movement of the drill pipe to the drill bit, is also provided that the at least one helical or spiral connection or profiling a relation to the longitudinal axis of the drill string great slope as corresponds to a further preferred embodiment of the device according to the invention.

As already indicated above, the introduction of excessive frictional forces between the drill pipe and / or adapter and the drill bit should be avoided if possible. In this connection, it is proposed according to a further preferred embodiment that a plurality of substantially point or hemispherical elevations in a blind hole of the drill bit for cooperation with the spiral or helical recess (s) or recess (s ) is provided on the end facing the drill bit of the adapter.

For uniform distribution of forces over the entire circumference of both the adapter or the drill string and the drill bit is proposed according to a further preferred embodiment that a plurality of adjacent, spiral flats on the outer circumference of the adapter or drill pipe and complementary flats in a blind hole the drill bit are provided, which have a polygonal, for example hexagonal, contour in cross section. Such a helical polygon can be easily formed while providing a reliable coupling available.

For a reliable cooling and / or flushing of the drill bit and / or the adapter during the drilling process is also proposed that in the interior of the drill string and / or the adapter, a passageway for supplying a cooling or flushing fluid to exit channels or holes of the Drill bit and / or the adapter is provided, which at the excavation surface of the drill bit and / or the Circumferential surface of the adapter open, as corresponds to a further preferred embodiment of the device according to the invention.

For a reliable removal of excavated material during the drilling process, whereby the chance of blocking or jamming of the drill bit during the execution of the drilling process are further reduced, is also preferably provided that in a conventional manner on the outer circumference of the drill bit depressions or Recesses and / or through holes are provided for the removal of degraded material via an annular space between the outer periphery of the drill pipe and the inner wall of the produced wellbore.

The present invention will be explained in more detail with reference to embodiments schematically illustrated in the accompanying drawings. 1 shows a plan view of a drill bit of the device according to the invention for carrying out the method according to the invention;

FIG. 2 is a rear view of the drill bit shown in FIG. 1; FIG.

Fig. 3 is a section along the line III-III of Fig. 1; Fig. 4 in a view similar to Figure 3 is a section along the line IV-IV of Fig. 1;

5 shows a side view of a first embodiment of an adapter used between the drill bit and the drill pipe according to FIGS. 1 to 4; FIG. 6 shows a side view of a modified embodiment of an adapter which is used between a drill bit and a drill rod in a representation similar to FIG. 5; FIG. and Fig. 7 is a section along the line VII-VII of Fig. 6 in a comparison with FIG. 6 enlarged scale.

From Fig. 1 to 4 it can be seen that an adapter 3 is provided between a generally designated 1 drill bit and a drill pipe generally designated 2, wherein the drill string 2 is connected via a schematically indicated with 4 screw with the adapter 3, wherein the Adapter 3 is shown separately in Fig. 5.

As can be seen in particular from FIG. 5, the adapter 3 at its end facing the drill bit 1 has at its outer circumference a plurality of helical or spiral depressions 7, which have a pitch which is marked by 8 in FIG Have inclination. The spiral or helical depressions or connections or profilings 7 on the outer circumference of the end 6 of the adapter 3 cooperate with punctiform or hemispherical elevations 9 of the drill bit, which are shown in more detail in FIGS. 3 and 4 and which provide reliable fixing the drill bit 1 on the adapter 3 and thus on the drill pipe 2 allows.

In the event of blockage of the drill bit 1 during the drilling process, for example, caused by a displacement or shifting of rock strata in the region of the drill bit 1, which subsequently a continuation of the drilling process is not possible, the drill pipe 2 and thus the adapter 3 as Also, the drill bit 1 subjected to a linear pull-out movement according to the arrow 10, wherein the direction of movement of the usual drilling or advancing direction is opposite. Through an interaction of the spiral or screw-like depressions 7 on the adapter 3 or its end facing the drill bit 6 and the corresponding elevations 9 in the interior of the blind hole 11 of the drill bit for receiving the free end 6 of the adapter 3 is provided by the provision of the extension movement 10th simultaneously causes a rotational movement of the drill bit 1 along the spiral or screw-like connections or profiles 7, so that a loosening or canceling the blockage of the drill bit 1 can be achieved by the linear extraction movement and simultaneous rotational movement of the drill bit 1. After a loosening of the drill bit 1, the drilling process can be carried out directly by means of an appropriate loading of the drill pipe 2 and thus subsequently the drill bit 1 with the interposition of the adapter 3 by known drive means, which are known at a projecting end of the drill pipe 2 from the borehole Attack the way.

In order to achieve a corresponding cooling or rinsing effect, moreover, both the drill pipe 2 and the adapter 3 are provided with a passageway 12 and 13, which opens into corresponding outlet channels or holes 14 of the drill bit 1, which in turn at the mining area 15 of the drill bit 1 open. In addition, the adapter 3 is provided starting from the passageway 13 with outlet channels 16 to assist in the removal of degraded material.

For a removal of the mined material from the area of the excavation surface 15 of the drill bit 1 1 through openings 17 are also provided on the outer circumference of the drill bit. In addition, the drill bit 1 has corresponding recesses 18 on its outer circumference, which are flat. if a reliable removal of material from the area of the excavation surface 15 of the drill bit 1 allow.

Instead of the embodiment shown in Fig. 1 to 5 with a plurality of distributed over the circumference Verbindungsungs- elements in the form of recesses 7 and elevations 9 can be found with a single connection Auslangen, which counteracts the drilling direction of the exercise in a linear extension movement Drill bit 1 gives a corresponding rotational movement in a direction opposite to the direction of the rotational movement during the drilling process.

Instead of the provision of the adapter 3 or its end 6 with the spiral or helical depressions 7, the drill bit 1 or its blind hole 11 may be provided with corresponding recesses or grooves, which with corresponding profilings, in particular elevations on the circumference of the end 6 of the Interact adapter 3.

Instead of the adapter 3 shown in the drawing, the drill bit facing the end of the drill string 2 may be provided directly with the corresponding spiral or helical depressions or elevations, which cooperate with corresponding profiles of the drill bit 1, so that an additional manufacturing cost for the adapter. 3 can be avoided.

When using the adapter 3, however, with conventional designs, in particular of the drill pipe 2, the occurrence can be found so that non-specific embodiments of the drill pipe 2 are provided for achieving a simple removal of a blockage of a drill bit 1. have to. Thus, in cases where due to the nature of the soil or rock material to be drilled, blockages or jamming of the drill bit due to displacements have to be feared, using a conventional drill pipe 2 by providing the adapter 3 and a matched drill bit 1 directly a drilling operation are performed, so that in particular waives the production of special drill string elements and thus storage can be simplified.

In the illustrated in Fig. 6 and 7 embodiment of an in turn designated 3 adapter it is seen that this is again indicated at 6 designated, not shown drill bit end with a plurality of helical or flattened flats 19, which, as can be seen in particular from FIG. 7, a polygonal, in particular hexagonal, contour is formed in cross-section. By providing the helical or spiral flats 19 at the end 6 of the adapter 3 and a formation of a blind hole 11 of a drill bit not shown with correspondingly complementary, a polygonal contour forming flattening can be in turn with a withdrawal of the drill string and the adapter 3 a Rotary loading on the drill bit, not shown in FIGS. 6 and 7, in a direction opposite to the drilling direction in order to loosen a stuck drill bit 1, so that subsequently a completion of a borehole is possible.

Instead of the substantially hexagonal contour of the helical polygon illustrated in FIGS. 6 and 7, it is understood that correspondingly modified polygonal constructions can be used. such as four, five, seven or more surveys.

Furthermore, it is indicated in FIGS. 6 and 7 that the abutting flats 19 are each connected via rounded regions 20, which are defined by the outer circumference of the cylinder-like end 6 of the adapter 3.

Claims

Patent claims

A method for removing a blockage of a drill bit (1) during drilling, in particular impact or rotary impact drilling, of holes in soil or rock material, wherein by a drill rod (2) mounted and through the drill string (2) to a rotational movement and optionally impacted and associated with this drill bit (1) a borehole is formed, characterized in that in a blocking of the drill bit (1), which further drilling operation and in particular a further rotation of the drill bit (1) prevents the drill bit (1) via the drill string (2) of a linear movement counter to the drilling direction and via a corresponding connection (7, 9) between the drill bit (1) facing the end of the drill string (2) and the drill bit (1) and independently of a rotary drive for performing the Drilling further to a rotational movement in a direction opposite to the direction of the Rotationsbew Sung during the drilling process is subjected.

2. The method according to claim 1, characterized in that the connection between the drill bit (1) facing the end of the drill string (2) and the drill bit (1) via a screw or spiral depression or flattening (19) or at least Collection (7) having adapter

(3) and a profiling complementary thereto (9) on the drill bit (1) is made, wherein the helical or flattening (19) or elevation

(7) has a large inclination or slope to the longitudinal axis of the drill string (2).

3. The method according to claim 2, characterized in that a plurality of helical or spiral-like profilings (7, 9, 19) is provided which are provided uniformly around the circumference of the drill bit (1) facing the end.

4. The method according to claim 1, 2 or 3, characterized in that a merely pointwise engagement at several points in the region of the profilings (7, 9, 19) between the drill string (2) or the adapter (3) and the drill bit (1 ) is provided.

5. A device for lifting a blockage of a drill bit (1) during drilling, in particular impact or rotary impact drilling, holes in soil or rock material, wherein a drill bit (1) mounted on a drill string (2) and through the drill string (2) a rotational movement and optionally impact movement for forming a borehole is acted upon, characterized in that between the drill bit facing the end of the drill string (2) and the drill bit (1) at least one spiral or screw-like connection (7) is provided, which at a blockage the drill bit (1) during a retraction of the drill string (2) against the drilling direction, the drill bit next to a linear movement against the drilling direction, the drill bit (1) irrespective of a rotary drive for performing the drilling operation to a rotational movement in a direction opposite to the direction of rotation during the Drilling process applied.

6. Apparatus according to claim 5, characterized in that the at least one spiral or helical connection by a depression or elevation (7) or flattening (19) on an intermediate between the drill string (2) and the drill bit (1) adapter (3) and a complementary profiling (9) on the drill bit (1) is formed.

7. Apparatus according to claim 5 or 6, characterized in that a plurality of helical or spiral-like profilings (7, 9, 19) between the drill string (2) and the adapter (3) and the drill bit (1) is provided , which are each equally spaced.

8. Apparatus according to claim 5, 6 or 7, characterized in that the at least one helical or spiral-like connection or profiling (7, 19) has a relative to the longitudinal axis of the drill string great slope or inclination.

9. Device according to one of claims 5 to 8, characterized in that a plurality of substantially point or hemispherical elevations (9) in a blind hole (11) of the drill bit (1) for cooperation with the (the) spiral or helical recess (s) or

Recess (s) (7) on the end facing the drill bit (6) of the adapter (3) is provided.

10. Device according to one of claims 5 to 8, characterized in that a plurality of contiguous, helical flats (19) on the outer circumference of the adapter (3) or drill pipe (2) and complementary flats in a blind hole (11) of the drill bit (1) are provided, which have a polygonal, for example hexagonal, contour in cross section.

11. Device according to one of claims 5 to 10, characterized in that in the interior of the drill string (2) and / or the adapter (3) has a passage channel (12, 13) for supplying a cooling or flushing fluid to exit channels or Holes (14, 16) of the drill bit (1) and / or the adapter (3) is provided, which at the excavation surface (15) of the

Drill bit (1) and / or the surface of the adapter (3) open.

12. Device according to one of claims 5 to 11, characterized in that in a conventional manner on the outer circumference of the drill bit (1) recesses or recesses (18) and / or Durchtrittslδcher (17) for the removal of degraded material via an annular space between the outer circumference of the drill string (2) and the inner wall of the produced borehole are provided.