CN113748253A - Drill pole - Google Patents
Drill pole Download PDFInfo
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- CN113748253A CN113748253A CN202080032057.3A CN202080032057A CN113748253A CN 113748253 A CN113748253 A CN 113748253A CN 202080032057 A CN202080032057 A CN 202080032057A CN 113748253 A CN113748253 A CN 113748253A
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- drill string
- coupling
- bearing structure
- axis
- intermediate section
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- 230000008878 coupling Effects 0.000 claims abstract description 66
- 238000010168 coupling process Methods 0.000 claims abstract description 66
- 238000005859 coupling reaction Methods 0.000 claims abstract description 66
- 238000005553 drilling Methods 0.000 claims abstract description 26
- 238000009527 percussion Methods 0.000 claims abstract description 16
- 239000007769 metal material Substances 0.000 claims abstract description 5
- 230000007704 transition Effects 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 24
- 230000002093 peripheral effect Effects 0.000 claims description 19
- 229910045601 alloy Inorganic materials 0.000 claims description 9
- 239000000956 alloy Substances 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 238000011010 flushing procedure Methods 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 229910000531 Co alloy Inorganic materials 0.000 claims description 3
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 239000003870 refractory metal Substances 0.000 claims description 3
- 229910003470 tongbaite Inorganic materials 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 34
- 239000011435 rock Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000005555 metalworking Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
- E21B17/0426—Threaded with a threaded cylindrical portion, e.g. for percussion rods
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a drill string rod (10) for percussive drilling. The drill string stem comprises: an elongated intermediate section (11) extending along an axis A; a first coupling (12) intended to be connected to a corresponding coupling element on an adjacent drill string, drill bit or percussion tool, said first coupling being arranged at a first end of said intermediate section; and a second coupling (13) arranged at a second end of the intermediate section (11) intended for connection to a corresponding coupling element on an adjacent drill string, drill bit or percussion tool, the second coupling being arranged at the second end of the intermediate section, wherein the drill string shaft (10) is made of a metallic material and at least one area of the first outer circumferential surface (18) of the first load bearing structure and/or the second outer circumferential surface (23) of the second load bearing structure is covered by a stiff layer (30). The invention also relates to a drill string formed by two or more drill string rods according to the invention.
Description
Technical Field
The present invention generally relates to a drill string rod for percussive drilling.
Background
In the field of construction engineering and in the mining industry, percussion drilling is an established method for drilling long boreholes with an elongated drill string formed by a plurality of drill rods. During drilling, a hammering impact from a hydraulically driven piston acts on the drill string to apply the required force to break up the rock and create a borehole.
During drilling, as the depth of the borehole increases, the length of the drill string is increased by adding additional drill string rods. In order to provide a flexible system for the operator, the drill string rods are substantially identical and provided with a male coupling at one end of the rods and a female coupling at the opposite end, so that the drill string rods can be connected by fitting the male coupling to the female coupling of an adjacent drill string rod. Percussion drilling is usually carried out at a depth of up to about 50 meters, energy being transferred from one rod to the next by impulse action. EP 2845992 discloses an embodiment of the described drill string system.
During impact drilling, the drill string and drill string rod are subjected to considerable loads due to the hammering impact from the hydraulically driven piston and the harsh environment in the drilled borehole. In order to ensure the desired performance of the drill string, it is crucial that the drill string shank maintains its ability to withstand the loads generated during drilling, and there is a continuing need for improved technical solutions aimed at improving the performance of the drill string and extending the life of the drill string shank.
Disclosure of Invention
It would be advantageous to achieve a drill string rod that alleviates at least some of the above-mentioned disadvantages. To better address one or more of these issues, a drill string rod as defined in the independent claims is provided. Preferred embodiments are defined in the dependent claims.
The drill stem for percussive drilling according to the present invention comprises:
an elongated intermediate section extending along an axis A,
a first coupling intended for connection to a corresponding coupling element on an adjacent drill string, drill bit or percussion tool, said first coupling being arranged at a first end of the intermediate section and comprising a first load-bearing structure extending beyond the extension of the intermediate section in the radial direction such that a first support surface is formed on that side of the first load-bearing structure which is facing away from the intermediate section, which first support surface is intended to bear against a corresponding support surface on an adjacent drill string, drill bit or percussion tool, said first load-bearing structure having a first outer circumferential surface and a first conical transition section which extends between the first outer circumferential surface and the intermediate section of the first load-bearing structure; and
a second coupling arranged at the second end of the intermediate section, intended to be connected to a corresponding coupling element on an adjacent drill string, drill bit or impact tool, said second coupling being arranged at the second end of the intermediate section and comprising a second load-bearing structure having substantially the same extension in the radial direction as the first load-bearing structure, said second load-bearing structure having a second outer circumferential surface and a second support surface intended to bear against a corresponding support surface on an adjacent drill string, drill bit or impact tool, said second coupling further comprising a second conical transition section extending between the second outer circumferential surface of said load-bearing structure and the intermediate section,
wherein the drill string rod is made of a metallic material and at least one area of the first outer circumferential surface of the first load bearing structure and/or the second outer circumferential surface of the second load bearing structure is covered by a hard layer.
The drill string shaft according to the invention ensures that the drill string shaft will work for a longer period of time than expected with known drill strings. A hard layer, i.e. a layer of a material harder and more wear resistant than the material of the drill string rod, may be applied on the surface area of the drill string rod where the load during drilling is high, in order to prevent the strength of the load-bearing structure from being affected by wear, which will eventually affect the load-bearing capacity of the drill string rod. The possibility of applying a hard layer on selected areas makes it possible to optimize the design of the drill string for maximum performance. By applying a hard layer the initial and desired outer diameter is not worn away as is the case in known drill rods. A well-defined diameter is very important in order to achieve drilling efficiency by a transition of the appropriate stress wave through the entire drill string. Furthermore, the overall life of the drill string rod is increased compared to currently used drill string rods.
In one embodiment of the drill string shaft, the hard layer is a layer of a material that is harder and more wear resistant than the material of the drill string shaft. The thickness of the layer in a direction perpendicular to the first peripheral surface and/or the second peripheral surface is in the range of 0.1-5 mm. The defined layer thickness range provides effective protection for the surface area of the drill string shaft that is highly loaded during drilling and is at risk of wear.
In one embodiment of the drill stem, the first and second peripheral surfaces are substantially parallel to the axis a. This configuration provides a smooth perimeter shape that is substantially parallel to the wide bore wall of the bore.
In one embodiment of the drill string shaft, the first conical transition section and/or the second conical transition section is/are covered by a hard layer. This embodiment is advantageous because it turns out that these parts of the drill string shaft are subjected to considerable wear during use.
In one embodiment of the drill string shaft, the area covered by the hard layer extends around the entire circumference of the drill string shaft about axis a. It is advantageous to have a layer of harder and more wear resistant material extending around the entire circumference of the drill string rod to protect the entire circumference of the drill bit rod.
In one embodiment of the drill string shaft, a portion of the first and/or second outer circumferential surface along the axis a is covered by the hard layer, and said portion of the first and/or second outer circumference is arranged adjacent to the respective first or second conical transition section, and a remaining portion of the first or second outer circumferential surface is uncovered such that the remaining portion has a smaller radius than the covered portion of the first and/or second outer circumference. This embodiment is advantageous in that the coating layer extending further from the longitudinal axis a than the first and second peripheries of the load bearing structure will protect the first and second support surfaces on the respective load bearing structure from damage during drilling, handling and transportation of the drill string rod, since the first and second peripheries and the first and second support surfaces are at least partially protected from contact with the ground, the surrounding structure and the interior of the drill hole.
In one embodiment of the drill stem, the hard layer is a layer of a material comprising an iron-based alloy, a cobalt-based alloy, a nickel-based alloy, a refractory metal, a cemented carbide, a metal-based composite, and/or a chromium carbide alloy. These different alternative materials provide a protective layer that can withstand wear and increase the interval between drill string rod replacements.
In one embodiment of the drill stem, the passage for the flushing medium extends coaxially with the axis a within the drill stem. This configuration makes it possible to direct a flow of flushing medium through the drill string rod to the flushing medium outlet in the drill bit in order to remove residual material from the drill hole and improve the drilling performance.
In one embodiment of the drill stem, the intermediate section has a circular or hexagonal cross-sectional shape transverse to the axis a. The circular or hexagonal cross-sectional shape ensures that the drill string rod has the desired properties.
In one embodiment of the drill stem, the first and second tapered transition sections have a circular cross-sectional shape transverse to axis a, and a curved, straight, or progressively decreasing radius along axis a. These different configurations provide a drill stem that is able to withstand loads during use, as axial loads applied during use are transferred to the intermediate section through the load bearing structure.
In one embodiment of the drill string shaft, the first and second support surfaces are arranged in a plane substantially transverse to the axis a. This embodiment of the drill string rod is able to withstand high axial loads during drilling.
In one embodiment of the drill string stem, the first coupling is a male coupling comprising a plug portion extending substantially coaxially with the axis a from the first contact surface of the first load bearing structure, and the second coupling is a female coupling comprising a sleeve-shaped element extending coaxially with the axis a, and said sleeve-shaped element is terminated by said second contact surface. This embodiment of the drill string rod is advantageous in that two or more drill string rods can be easily connected to form an extended drill string without the need for additional connection elements or connectors.
The invention also relates to a drill string comprising two or more drill string rods according to the above definition, which drill string rods are fitted together by means of a first coupling and a second coupling such that the first contact surface and the second contact surface on adjacent drill string rods are in contact with each other.
Drawings
The invention will be better understood from the following illustrative and non-limiting detailed description of preferred embodiments, with reference to the attached drawings, in which:
FIG. 1 is a perspective view of a drill string stem and enlarged male and female couplers.
Figure 2 shows a perspective view of two drill string rods connected to form a drill string.
Fig. 3A and 3B show cross-sectional views along axis a of the male and female couplings of a drill string rod before and after being assembled to an adjacent drill string rod.
All the figures are schematic, not necessarily to scale, and generally show only parts which are necessary in order to elucidate the invention, wherein other parts may be omitted or merely suggested.
Detailed Description
In fig. 1, a drill string 10 according to the present invention is shown in perspective view.
The drill string rod 10 comprises an elongate intermediate section 11 extending along an axis a, and a first coupling 12 arranged at one end of the intermediate section and a second coupling 13 arranged at the opposite end of the intermediate section. The first and second couplings make it possible to connect the drill string rod to a drill bit (not shown), to a percussion drilling tool (not shown, i.e. a percussion drilling machine, which is arranged to provide the required power during drilling), or to another drill string rod to lengthen the drill string as the drilling depth increases. The drill bit is configured to act on the rock and form a borehole, and can be adjusted for a particular type of rock.
The first coupling 12 comprises a first load-bearing structure and the second coupling 13 comprises a second load-bearing structure, both designed to bear loads applied during drilling and to transfer loads between the drill bit, the drill string rod or rods and the percussion drilling machine. As long as the load-bearing capacity is ensured, the first coupling and the second coupling can be implemented in different ways.
The first bearing structure extends beyond the extension of the intermediate section 11 in the radial direction, so that a first support surface 17 is formed on that side of the first bearing structure which faces away from the intermediate section, which first support surface 17 is intended to bear against a corresponding support surface on an adjacent drill string, drill bit or percussion tool. The first load bearing structure also has a first outer peripheral surface 18 substantially parallel to the axis a and a first tapered transition section 20, the first tapered transition section 20 extending between the first outer peripheral surface 18 and the intermediate section 11 of the first load bearing structure to form a smooth transition between the load bearing structure and the intermediate section. The second load bearing structure has the same critical parts as the first load bearing structure and has substantially the same extension in the radial direction as the first load bearing structure. The second load bearing structure has a second outer circumferential surface 23 substantially parallel to the axis a and a second support surface 24 intended to bear against a corresponding support surface on an adjacent drill string, drill bit or percussion tool. The second coupling 13 further comprises a second conical transition section 25 extending between the second outer circumferential surface 23 of the second carrier structure 21 and the intermediate section 11. The first and second support surfaces are arranged in a plane transverse to the axis a.
In the embodiment of the drill string 10 shown in fig. 1 to 3, the first coupling 12 is embodied as a male coupling and the second coupling 13 is embodied as a female coupling.
The male and female configurations of the first and second couplings are such that two or more substantially identical drill string rods can be connected to a drill string 100 of a desired length by connecting the male coupling of one drill string to the female coupling of an adjacent drill string rod. During drilling, as the depth of the borehole increases, additional drill string rods 10 are connected to extend the length of the drill string 100.
As long as the required strength is ensured, the middle section 10 can be implemented in different ways, for example with a circular, rectangular, pentagonal or hexagonal cross-sectional shape. The intermediate section is solid or comprises a passage 26, the passage 26 extending through the drill string shank in the centre of the intermediate section to allow a flushing medium to flow through the drill string to a drill bit arranged at the front end of the drill string to remove particles and gravel cut from the rock during drilling. The flushing medium is for example air, water or a mixture of air and water.
The illustrated male coupling 12 includes a male plug portion 14, the male plug portion 14 extending from a first support surface 17 coaxially with the mid-section along an axis a. In the illustrated embodiment, the male plug portion 14 has substantially the same radius as the intermediate section 11, but the dimensions may be varied to adapt the plug portion and the intermediate section to different needs. The male plug portion 14 includes external threads 15, the external threads 15 extending along the entire length of the plug portion along axis a.
The first carrier structure 16 is arranged between the male plug portion 14 and the intermediate section 11. In the embodied male coupling, the carrier structure 16 is designed as a flange extending in a substantially radial direction from the axis and has an extension in the radial direction beyond the intermediate section and the male plug portion, so that a first support surface 17 is formed on that side of the flange which faces the plug portion. The support surface 17 is arranged substantially transversely to the axis a and has a uniform shape around the male plug portion. The first peripheral surface 18 extends around and along the flange and is arranged substantially parallel to the axis a. The radially flared extension of the first load bearing structure 16 makes shoulder contact with the adjacent drill pipe. The shoulder contact provides increased energy transfer efficiency. However, the first peripheral surface may also be angled relative to the axis a, and the length of the load bearing structure (i.e. the flange) along the axis a may be adjusted to the particular requirements of the drill rod. A first tapered transition section 20 is disposed between the first outer peripheral surface 18 and the intermediate section 11. The first tapered transition section 20 is intended to form a smooth connection between the outer peripheral surface 28 of the flange 16 and the intermediate section 11 to transmit loads through the drill string rod, and has a circular cross-sectional shape transverse to the axis a. The narrowed transition may be implemented in different ways, and examples of different embodiments may be a curved section, a straight angled section, or a section with a gradually decreasing radius along axis a.
The second coupling 13 is arranged in the opposite end. The second coupling is embodied as a female coupling permanently fitted to the intermediate section 11. The shape and dimensions of the female coupler 13 correspond to the dimensions of the male coupler (i.e. the male plug portion 14 and the support surface 17) so that identical drill string rods 10 can be connected to each other to form a drill string 100. The female coupling 13 comprises a sleeve-shaped element 21 extending coaxially with the intermediate section. The sleeve-shaped element 21 has an internal thread 22, which internal thread 22 corresponds to the external thread on the male plug part. The outer surface of the sleeve-shaped element constitutes a second peripheral surface 23 extending substantially parallel to the axis a. The sleeve-shaped element 21 has an inner radius corresponding to the radius of the female plug portion and an outer radius corresponding to the radius of the flange 16. The sleeve-shaped element 21 is terminated by a substantially flat second support surface 24, which second support surface 24 extends in a plane transverse to the axis a. The axial length of the male plug part and the sleeve-shaped element is chosen such that when two or more drill rods are fitted together, the second support surface 24 should be in contact with the first support surface 17 of the adjacent drill rod, so that the axial force during drilling is transmitted from one drill rod to the other via the bearing structure (i.e. the sleeve-shaped element 21, the second support surface 24 and the first support surface 17 on the first bearing structure 16), instead of transmitting the axial force via the threads. The second outer circumferential surface 21, i.e. the sleeve-shaped element, has substantially the same radius as the radius of the flange 16, so that the contact area between the contact surface and the support surface is as large as possible.
The second coupling further comprises a second conical transition section 25 extending between the second outer circumferential surface 23 of the carrying structure 21 and the intermediate section 11. The second conical transition section 25 has the same properties as the first conical transition section 20, namely a circular cross-sectional shape transverse to the axis a and a curved, straight or gradually decreasing radius along the axis a.
The drill stem 10 is made of a metallic material and is made in different pieces that are permanently assembled together or in a single piece of material. To ensure that the drill string is able to function as intended for a long period of time, the surface of the critical part of the drill string is covered by a hard layer 30. The hard layer is a layer of a material that is harder and more wear resistant than the metallic material of the drill stem 10.
The hard layer 30 may be coated on different areas of the drill string shaft to reduce wear and to ensure that the load bearing structure of the drill string shaft has sufficient strength over an extended period of time. Preferably, the hard layer is applied on at least a region of the first outer circumferential surface 18 of the first bearing structure 16 and/or the second outer circumferential surface 23 of the second bearing structure 21, as these regions of the drill string are essential for ensuring that the drill string is able to bear axial loads on the support surfaces and the contact surfaces.
The thickness of the applied hard layer 30 in the direction perpendicular to the surface to be covered is in the range of 0.1-5 mm. The layer thickness is constant over the entire covered area or is adjusted such that a thicker layer is applied where the risk of wear is higher. The layer is applied on the surface of the drill string shaft (i.e., the surface of the first coupling and the second coupling) or within a recess formed in the surface of the first coupling and/or the second coupling.
Other different areas of the drill string may be covered by a hard layer. However, to achieve the desired effect, at least one region of the first peripheral surface of the first load bearing structure and/or the second peripheral surface of the second load bearing structure is covered by a hard layer.
To further increase the protective effect, the first conical transition section and the second conical transition section may be covered by a hard layer.
As the drill string shaft rotates during use, the area covered by the hard layer preferably extends around the entire circumference of the drill string shaft about axis a.
In the embodiment of the first coupling 12 shown in fig. 3A and 3B, a portion of the first outer peripheral surface disposed adjacent the first tapered transition section 20 is covered by a stiff layer 30. The remaining portion of the first outer peripheral surface is uncovered and has a smaller radius.
Fig. 3A and 3B also show an example of a second coupling 13, wherein a portion of a second outer circumferential surface of the load-bearing structure arranged adjacent to the second conical transition section is covered by a stiff layer 30. The remainder of the outer periphery is uncovered and has a smaller radius.
The hard layer is a layer made of a harder and more wear-resistant material and may be formed of different types of materials. Examples of materials are materials comprising iron-based alloys, cobalt-based alloys, nickel-based alloys, refractory metals, cemented carbides, metal-based composites, and/or chromium carbide alloys having desired properties. Additional materials are also possible.
The technique of applying a layer of harder and more wear resistant material is commonly referred to as "case hardening". Case hardening is a metal working process in which a harder or tougher material is applied to a base metal. The applied material is typically welded to the base material to ensure that the applied material is adhered to the base material. An alternative approach involves the use of powder metal alloys that are welded to the surface of the product where a protective hard layer is desired.
While the invention has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive; the invention is not limited to the disclosed embodiments. Those skilled in the art will appreciate that numerous modifications, variations and changes may be envisaged within the scope of the appended claims. For example, the drill string rods may be implemented with two male couplers or two female couplers such that the drill string rods of the two different embodiments are alternately arranged to form an elongated drill string.
Alternatively, only one drill string is sufficient to drill the intended borehole, and a configuration having a male or female coupling at both ends is suitable for connecting the intended drill bit at one end and a percussion tool at the other end.
Furthermore, variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Any reference signs in the claims shall not be construed as limiting the scope of the claims.
Claims (13)
1. Drill string (10) for percussive drilling, the drill string comprising:
an elongated intermediate section (11), said intermediate section (11) extending along an axis A,
a first coupling (12) intended to be connected to a corresponding coupling element on an adjacent drill string, drill bit or percussion tool, the first coupling is arranged at a first end of the intermediate section and comprises a first load-bearing structure (16), the first bearing structure (16) extends in the radial direction beyond the extension of the intermediate section (11), such that a first supporting surface (17) is formed on that side of the first carrier structure (16) which faces away from the intermediate section (11), which first support surface is intended to bear against a corresponding support surface on the adjacent drill string, drill bit or percussion tool, the first load-bearing structure (16) having a first outer peripheral surface (18) and a first tapered transition section (20), the first conical transition section (20) extending between the first outer peripheral surface (18) of the first load-bearing structure (16) and the intermediate section (11); and
a second coupling (13) arranged at a second end of the intermediate section (11) intended to be connected to a corresponding coupling element on an adjacent drill string, drill bit or percussion tool, the second coupling being arranged at a second end of the intermediate section (11) and comprising a second load-bearing structure (21), the extension of the second load-bearing structure (21) in the radial direction being substantially the same as the extension of the first load-bearing structure (16) in the radial direction, the second load-bearing structure (21) having a second outer circumferential surface (23) and a second support surface (24), the second support surface (24) being intended to bear against a corresponding support surface on the adjacent drill string, drill bit or percussion tool, the second coupling (13) further comprising a second conical transition section (25) extending between the second outer circumferential surface (23) of the load-bearing structure (21) and the intermediate section (11) ,
wherein the drill string shaft (10) is made of a metallic material and at least one area of the first outer circumferential surface (18) of the first load bearing structure (16) and/or the second outer circumferential surface (23) of the second load bearing structure (21) is covered by a hard layer (30).
2. The drill string (10) as claimed in claim 1, wherein the hard layer (30) is a layer of a material harder and more wear resistant than the material of the drill string, the layer having a thickness in a direction perpendicular to the first outer circumferential surface (18) and/or the second outer circumferential surface (23) in the range of 0.1-5 mm.
3. The drill string rod (10) according to claim 1 or 2, wherein the first outer circumferential surface (18) and the second outer circumferential surface (23) are substantially parallel to an axis a.
4. The drill string shaft (10) according to any one of the preceding claims, wherein the first conical transition section (20) and/or the second conical transition section (25) is/are covered by the hard layer (30).
5. The drill string (10) as claimed in any one of the preceding claims, wherein the area covered by the stiff layer (30) extends around the entire circumference of the drill string about axis A.
6. The drill string rod (10) according to any one of the preceding claims, wherein a portion of the first and/or second outer peripheral surface (18, 23) along axis a is covered by the stiff layer (30) and the portion of the first and/or second outer periphery is arranged adjacent the respective first or second conical transition section (20, 25) and a remaining portion of the first or second outer peripheral surface (18, 23) is uncovered such that the remaining portion of the first or second outer peripheral surface (18, 23) has a smaller radius than the covered portion of the first and/or second outer periphery (18, 23).
7. Drill string shaft (10) according to any one of the preceding claims, wherein the hard layer (30) is a layer of a material comprising an iron-based alloy, a cobalt-based alloy, a nickel-based alloy, a refractory metal, a cemented carbide, a metal-based composite material and/or a chromium carbide alloy.
8. The drill string rod (10) as claimed in any one of the preceding claims, wherein a channel (26) for flushing medium extends coaxially with the axis a within the drill string rod (10).
9. Drill string rod (10) according to any one of the preceding claims, wherein the intermediate section (11) has a circular or hexagonal cross-sectional shape transverse to the axis A.
10. The drill string rod (10) of any one of the preceding claims, wherein the first conical transition section (20) and the second conical transition section (25) have a circular cross-sectional shape transverse to the axis A, and a curved, straight or gradually decreasing radius along the axis A.
11. Drill string rod (10) according to any one of the preceding claims, wherein the first support surface (17) and the second support surface (24) are arranged in a plane substantially transverse to the axis A.
12. Drill string stem (10) according to any one of the preceding claims, wherein the first coupling (12) is a male coupling comprising a plug portion (14) extending substantially coaxially with the axis A from the first contact surface (17) of the first load bearing structure (16), and the second coupling (13) is a female coupling comprising a sleeve-shaped element (22) extending coaxially with the axis A, and which is terminated by the second contact surface (24).
13. Drill string (100) comprising two or more drill string rods (10) according to claim 1, the drill string rods (10) being fitted together by the first coupling (12) and the second coupling (13) such that the first and second contact surfaces (24) on adjacent drill string rods (10) are in contact with each other.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19176255.8 | 2019-05-23 | ||
| EP19176255.8A EP3741956A1 (en) | 2019-05-23 | 2019-05-23 | Drill string rod |
| PCT/EP2020/063877 WO2020234259A1 (en) | 2019-05-23 | 2020-05-19 | Drill string rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113748253A true CN113748253A (en) | 2021-12-03 |
Family
ID=66647149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080032057.3A Pending CN113748253A (en) | 2019-05-23 | 2020-05-19 | Drill pole |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP3741956A1 (en) |
| KR (1) | KR20220008825A (en) |
| CN (1) | CN113748253A (en) |
| PE (1) | PE20220109A1 (en) |
| WO (1) | WO2020234259A1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3067593A (en) * | 1960-08-29 | 1962-12-11 | American Iron & Machine Works | Integral tool joint drill pipe |
| US8678447B2 (en) * | 2009-06-04 | 2014-03-25 | National Oilwell Varco, L.P. | Drill pipe system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3537738A (en) * | 1968-04-15 | 1970-11-03 | Sandvikens Jernverks Ab | Drill rod for long hole drilling in the ground |
| SE516651C2 (en) * | 1999-11-26 | 2002-02-05 | Sandvik Ab | Threaded joints for striking drilling, a trade and a female part |
| PL2845992T3 (en) | 2013-09-09 | 2016-07-29 | Sandvik Intellectual Property | Drill string with bend resistant coupling |
| EP2845991B1 (en) * | 2013-09-09 | 2015-11-18 | Sandvik Intellectual Property AB | Drill string rod with strengthened spigot coupling |
-
2019
- 2019-05-23 EP EP19176255.8A patent/EP3741956A1/en active Pending
-
2020
- 2020-05-19 PE PE2021001648A patent/PE20220109A1/en unknown
- 2020-05-19 WO PCT/EP2020/063877 patent/WO2020234259A1/en active Application Filing
- 2020-05-19 CN CN202080032057.3A patent/CN113748253A/en active Pending
- 2020-05-19 KR KR1020217037295A patent/KR20220008825A/en not_active Application Discontinuation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3067593A (en) * | 1960-08-29 | 1962-12-11 | American Iron & Machine Works | Integral tool joint drill pipe |
| US8678447B2 (en) * | 2009-06-04 | 2014-03-25 | National Oilwell Varco, L.P. | Drill pipe system |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20220008825A (en) | 2022-01-21 |
| WO2020234259A1 (en) | 2020-11-26 |
| EP3741956A1 (en) | 2020-11-25 |
| PE20220109A1 (en) | 2022-01-26 |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20211203 |
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| WD01 | Invention patent application deemed withdrawn after publication |