Hollow drill pipe

Abstract

The utility model relates to a hollow drill rod. Hollow drill rod includes hollow rod body and reinforcing ring, above-mentioned hollow drill rod, weld a reinforcing ring with the strength more than the strength of hollow rod body through at the lower pipe orifice of hollow rod body, to increase the pipe orifice strength of hollow drill rod lower end. Further, the reinforcing ring and hollow rod body coaxial arrangement is established to avoid eccentric or radial runout when hollow drill rod rotates, thereby reducing additional stress and breakage, and make reinforcing ring and hollow drill rod at the circumferential profile of lower pipe orifice consistent, to ensure that hollow drill rod surface stress is even, reduce local stress concentration point, prevent fatigue crack initiation, so through optimizing coaxial degree and profile consistency, can reduce hollow drill rod fatigue failure risk. Therefore, the hollow drill rod has longer service life, lower maintenance frequency and maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of drilling tools, and in particular to a hollow drill pipe. Background Technology

[0002] Currently, hollow drill pipes are mainly used in geological exploration and engineering drilling. As an important component of the drill string, they connect the drill bit and transmit the power and torque of the drilling rig, ensuring the stability of drilling operations. They also transport mud or flushing fluid to the bottom of the borehole, cooling the drill bit and carrying away rock cuttings. However, the downhole casing of traditional hollow drill pipes is prone to cracking at the casing opening under prolonged use or high torque, leading to drill pipe damage. Furthermore, repairs are difficult and time-consuming. Utility Model Content

[0003] Therefore, it is necessary to provide a hollow drill pipe that can reduce the failure rate of bottom pipe cracking, extend the service life of drill pipe, and reduce maintenance frequency and cost.

[0004] A hollow drill pipe includes a hollow rod body with a lower opening and a reinforcing ring with a material strength greater than that of the hollow rod body; the reinforcing ring is welded to the lower opening and is coaxially arranged with the hollow rod body; the circumferential profile of the reinforcing ring is consistent with the circumferential profile of the hollow rod body at the lower opening.

[0005] In one embodiment, the lower nozzle has a welding area for welding with the reinforcing ring; at least the hollow rod corresponding to the welding area is doped with auxiliary ions to improve the welding performance of the hollow rod; the welding performance of the auxiliary ions is superior to the welding performance of corrosion-resistant ions in the material used to make the hollow rod.

[0006] In one embodiment, the reinforcing ring has a welding area for welding to the hollow rod; at least the reinforcing ring corresponding to the welding area is doped with auxiliary ions to improve the welding performance of the reinforcing ring; the welding performance of the auxiliary ions is superior to the welding performance of corrosion-resistant ions in the material used to make the reinforcing ring.

[0007] In one embodiment, the auxiliary ions are doped throughout the entire region of the reinforcing ring.

[0008] In one embodiment, the auxiliary ions are implanted into the welding area using an ion implantation process.

[0009] In one embodiment, the auxiliary ion is an iron-based ion and / or a nickel-based ion.

[0010] In one embodiment, at least one of the end where the lower pipe opening is located and the end of the reinforcing ring facing the hollow rod body is provided with a notch; the notch is chamfered so that the end face where the lower pipe opening is located overlaps with the end face of the reinforcing ring facing the hollow rod body to form a weld groove, and a weld is formed at the overlap; the weld groove is filled with solder; the inner wall of the weld groove is the welding area.

[0011] In one embodiment, the reinforcing ring is made of high-strength wear-resistant steel.

[0012] The aforementioned hollow drill pipe increases the strength of the lower end of the drill pipe by welding a reinforcing ring with a strength greater than that of the hollow pipe body to the lower pipe opening. Furthermore, the reinforcing ring is coaxially aligned with the hollow pipe body to prevent eccentricity or radial runout during rotation, thereby reducing additional stress and breakage. The circumferential contours of the reinforcing ring and the hollow drill pipe at the lower pipe opening are also aligned to ensure uniform stress distribution on the surface of the hollow drill pipe, reducing local stress concentration points and preventing fatigue crack initiation. By optimizing coaxiality and contour consistency, the risk of fatigue failure of the hollow drill pipe can be reduced. Therefore, the aforementioned hollow drill pipe offers a long service life, low maintenance frequency, and low maintenance costs. Attached Figure Description

[0013] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0014] Figure 1 This is a schematic diagram of the structure of a hollow drill rod in a preferred embodiment of the present invention;

[0015] Figure 2 for Figure 1 A magnified view of a portion of the hollow drill pipe shown.

[0016] The reference numerals are as follows: 100, hollow drill pipe; 110, hollow rod body; 111, lower pipe opening; 120, reinforcing ring; 130, notch; 140, weld groove; 150, weld. Detailed Implementation

[0017] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] When describing positional relationships, unless otherwise specified, when an element is referred to as being "on" another element, it may be directly on the other element or there may be intermediate elements. It is also understood that when an element is referred to as being "between" two elements, it may be the only one between the two elements, or there may be one or more intermediate elements.

[0020] When using the terms “including,” “having,” and “comprising” as described herein, another component may be added unless explicitly qualifying terms such as “only,” “consisting of,” etc. are used. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0021] Appendix Figure 1 The diagram illustrates the structure of a hollow drill rod according to one embodiment of the present invention. For ease of explanation, the accompanying drawings only show structures relevant to embodiments of the present invention.

[0022] Please see Figure 1 In a preferred embodiment of this utility model, the hollow drill rod 100 includes a hollow rod body 110 and a reinforcing ring 120. The hollow rod body 110 has a lower opening 111. The reinforcing ring 120 has a material strength greater than that of the hollow rod body 110. The reinforcing ring 120 is welded to the lower opening 111 and is coaxially arranged with the hollow rod body 110. The circumferential profile of the reinforcing ring 120 is consistent with the circumferential profile of the hollow rod body 110 at the lower opening 111. Specifically, the reinforcing ring 120 is made of high-strength wear-resistant steel, such as NM500, NM550 / 600, high-strength alloy steel, Hardox 500 / 550 / 600, etc.

[0023] The hollow drill rod 100 described above increases the strength of the lower end of the drill rod 100 by welding a reinforcing ring 120, which has a higher strength than the hollow rod body 110, to the lower end of the drill rod 110. Furthermore, the reinforcing ring 120 is coaxially arranged with the hollow rod body 110 to prevent eccentricity or radial runout during rotation of the hollow drill rod 100, thereby reducing additional stress and breakage. The circumferential contours of the reinforcing ring 120 and the hollow drill rod 100 at the lower end of the drill rod 111 are also aligned to ensure uniform stress distribution on the surface of the hollow drill rod 100, reduce local stress concentration points, and prevent fatigue crack initiation. By optimizing coaxiality and contour consistency, the risk of fatigue failure of the hollow drill rod 100 can be reduced. Therefore, the hollow drill rod 100 described above offers a longer service life, lower maintenance frequency, and lower maintenance costs.

[0024] In some embodiments, the lower nozzle 111 has a welding area (not shown) for welding with the reinforcing ring 120. At least the hollow rod 110 corresponding to the welding area is doped with auxiliary ions to improve the welding performance of the hollow rod 110. The welding performance of the auxiliary ions is superior to that of corrosion-resistant ions in the material used to make the hollow rod 110. Because the auxiliary ions have better welding performance, doping them into the welding area at the lower nozzle 111 increases the content of these better-performing ions within the welding area, thereby improving the welding performance of the welding area, ensuring the welding effect between the hollow rod 110 and the reinforcing ring 120, and extending the service life of the hollow drill rod 100.

[0025] In some embodiments, the reinforcing ring 120 has a welding area (not shown) for welding to the hollow rod 110. At least the reinforcing ring 120 corresponding to the welding area is doped with auxiliary ions to improve the welding performance of the reinforcing ring 120. The welding performance of the auxiliary ions is superior to that of corrosion-resistant ions in the material used to make the reinforcing ring 120. Because the auxiliary ions have better welding performance, doping them into the welding area of ​​the reinforcing ring 120 increases the content of these better-performing ions within the welding area, thereby improving the welding performance of the welding area, ensuring the welding effect between the reinforcing ring 120 and the hollow rod 110, and extending the service life of the hollow drill rod 100.

[0026] Specifically, the auxiliary ions are nickel-based ions and / or iron-based ions. That is, the auxiliary ions used for doping can be iron-based ions, nickel-based ions, or a mixture of iron-based and nickel-based ions.

[0027] Furthermore, in some embodiments, auxiliary ions are doped throughout the reinforcing ring 120 to improve the overall weldability of the reinforcing ring 120.

[0028] Furthermore, in some embodiments, auxiliary ions are implanted into the welding area using an ion implantation process, so that the auxiliary ions combine with the atoms or molecules on the surface of the welding area to form a modified layer. There is no clear interface between the modified layer and the base material of the welding area, the bond is strong, and there is no phenomenon of detachment, which further improves the welding effect between the reinforcing ring 120 and the hollow rod 110.

[0029] Please refer to the following: Figure 2 In some embodiments, at least one of the ends of the lower pipe opening 111 and the end of the reinforcing ring 120 facing the hollow rod 110 is provided with a notch 130. That is, the notch 130 can be provided at the end of the lower pipe opening 111, or at the end of the reinforcing ring 120 facing the hollow rod 110, or even at both the end of the lower pipe opening 111 and the end of the reinforcing ring 120 facing the hollow rod 110. The notch 130 is chamfered so that the end face of the lower pipe opening 111 overlaps with the end face of the reinforcing ring 120 facing the hollow rod 110 to form a weld groove 140, and a weld 150 is formed at the overlap. The weld groove 140 is filled with solder. The inner wall of the weld groove 140 is the welding area.

[0030] By setting a weld groove 140 and filling the weld groove 140 with Korean material, it is beneficial to increase the welding area between the hollow rod 110 and the reinforcing ring 120, and to ensure that the molten welding material penetrates into the weld 150, thereby improving the strength of the weld between the reinforcing ring 120 and the hollow rod 110, and further improving the welding effect between the reinforcing ring 120 and the hollow rod 110.

[0031] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0032] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A hollow drill pipe, characterized in that, It includes a hollow rod with a lower opening and a reinforcing ring with a material strength greater than that of the hollow rod; the reinforcing ring is welded to the lower opening and is coaxially arranged with the hollow rod; the circumferential profile of the reinforcing ring is consistent with the circumferential profile of the hollow rod at the lower opening.

2. The hollow drill pipe according to claim 1, characterized in that, The lower nozzle has a welding area for welding with the reinforcing ring; at least the hollow rod corresponding to the welding area is doped with auxiliary ions to improve the welding performance of the hollow rod; the welding performance of the auxiliary ions is better than the welding performance of corrosion-resistant ions in the material used to make the hollow rod; the auxiliary ions are implanted into the welding area using an ion implantation process, so that the auxiliary ions combine with the atoms or molecules on the surface of the welding area to form a modified layer.

3. The hollow drill pipe according to claim 1, characterized in that, The reinforcing ring has a welding area for welding to the hollow rod; at least the reinforcing ring corresponding to the welding area is doped with auxiliary ions to improve the welding performance of the reinforcing ring; the welding performance of the auxiliary ions is better than the welding performance of corrosion-resistant ions in the material used to make the reinforcing ring; the auxiliary ions are implanted into the welding area using an ion implantation process, so that the auxiliary ions combine with the surface atoms or molecules of the welding area to form a modified layer.

4. The hollow drill pipe according to claim 3, characterized in that, The auxiliary ions are doped throughout the entire area of ​​the reinforcing ring.

5. The hollow drill pipe according to claim 2 or 3, characterized in that, The auxiliary ions are iron-based ions and / or nickel-based ions.

6. The hollow drill pipe according to claim 2 or 3, characterized in that, At least one of the ends where the lower pipe opening is located and the end of the reinforcing ring facing the hollow rod body is provided with a notch; the notch is chamfered so that the end face where the lower pipe opening is located overlaps with the end face of the reinforcing ring facing the hollow rod body to form a weld groove, and a weld is formed at the overlap; the weld groove is filled with welding material; the inner wall of the weld groove is the welding area.

7. The hollow drill pipe according to claim 1, characterized in that, The reinforcing ring is made of high-strength wear-resistant steel.

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