Inverted drill pipe

Abstract

The utility model belongs to the technical field of drill pipe, specifically provide a reverse well drill pipe, the both ends of reverse well drill pipe are provided with male joint and female joint respectively, annular stress dispersion groove is arranged in the root of male joint, stress dispersion groove can reduce the stress concentration of male joint root position, prevent the root of male joint from breaking due to tension or torque, improve the overall structural strength of reverse well drill pipe. The outer wall of reverse well drill pipe is provided with square groove, and the number of square groove is four or six. The setting of square groove makes the cross section of reverse well drill pipe at this position be a regular quadrilateral or regular hexagon, and the construction personnel can clamp by using wrench, thereby tightening or disassembling reverse well drill pipe. The outer wall of reverse well drill pipe is provided with anti -skid line, anti -skid line extends along the axial direction of reverse well drill pipe, and anti -skid line helps to increase the friction force of holding of construction personnel, facilitates the manual installation and disassembly of reverse well drill pipe, and is convenient to use in narrow space, inconvenient operation underground environment.

Description

Technical Field

[0001] This application belongs to the field of drill pipe technology, specifically a reverse drilling pipe. Background Technology

[0002] Raise pipes are specialized drill pipes used on raise drilling rigs. Designed to adapt to the working conditions of raise drilling rigs, they are shorter and more compact than conventional drill pipes, facilitating operation and transportation in space-constrained underground environments. Raise pipes also experience greater tensile forces during the raise drilling process (reaming from bottom to top), unlike conventional drill pipes (drilling from top to bottom). The basic structure of a raise pipe is a hollow rod body with internal threads (female connector) and external threads (male connector) machined at both ends. Multiple drill pipes are connected to form a continuous drill string by tightening these threads.

[0003] The existing technology for raise pipes has the following shortcomings: 1. Both the internal and external threads of the raise pipe are machined by cutting. Stress concentration occurs at the root of the male connector's thread. Due to the small diameter of the raise pipe and the large tensile force during upward drilling, cracks or even breakage can easily occur at the root of the male connector's thread. 2. In confined underground environments (such as tunnels) where operation is inconvenient, manual connection and disassembly of the raise pipe is required when automatic drill pipe transport equipment cannot access the area. Because the drill pipe is machined using high-precision turning technology, its surface is relatively smooth, making it difficult for personnel to hold or for tools to jam. Utility Model Content

[0004] Based on the above-mentioned technical problems, this application provides a reverse drilling pipe to solve the technical problems of easy cracking at the root of the male connector and inconvenience for manual connection and disassembly in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: A raise-well drill pipe suitable for raise-well drilling rigs is provided. The raise-well drill pipe has a male connector and a female connector at both ends. The male connector has an external thread and an annular stress-dispersing groove is formed at the root of the male connector. The bottom diameter of the stress-dispersing groove is smaller than the outer diameter of the root of the male connector. The female connector has a threaded hole that matches the external thread. The raise-well drill pipe has an inner hole that extends through its own axial direction. The outer wall of the raise drill pipe has a square groove at one end near the male connector, and a plurality of square grooves are spaced apart along the circumferential direction of the raise drill pipe, and the number of square grooves is four or six. The outer wall of the raise boring bar has anti-slip grooves at one end near the female connector. The anti-slip grooves extend along the axial direction of the raise boring bar and are spaced out in multiple places along the circumferential direction of the raise boring bar.

[0006] In one possible implementation, the inner wall of the female connector is provided with an annular first sealing groove, which is used to accommodate a rubber sealing ring; when multiple haulage drill pipes are connected end to end, the male connector of the previous haulage drill pipe is threadedly engaged with the female connector of the next haulage drill pipe and abuts against the rubber sealing ring.

[0007] In one possible implementation, the male connector has a sealing boss at its end, the sealing boss being annular, and the male connector having an arc-shaped surface, an outer conical surface, and a cylindrical surface sequentially formed from its root to its end, wherein the outer conical surface has the external thread, the stress dispersion groove forms the arc-shaped surface, the minimum diameter of the arc-shaped surface is smaller than the major diameter of the outer conical surface, and the outer surface of the sealing boss forms the cylindrical surface, the diameter of the cylindrical surface being smaller than or equal to the minor diameter of the outer conical surface.

[0008] In one possible implementation, when multiple raise pipes are connected end to end, the cylindrical surface of the previous raise pipe abuts against the rubber sealing ring inside the subsequent raise pipe.

[0009] In one possible implementation, the inner wall of the threaded hole is provided with a limiting boss, the limiting boss is annular, and the first sealing groove is opened on the side of the limiting boss facing the opening of the threaded hole. When multiple raking drill pipes are connected end to end, the end face of the sealing boss of the previous raking drill pipe abuts against the rubber sealing ring inside the next raking drill pipe.

[0010] In one possible implementation, the threaded hole has an annular second sealing groove at a position near the end of the female connector, the second sealing groove being used to accommodate a rubber sealing ring.

[0011] In one possible implementation, the raise pipe includes a first connecting section and a second connecting section, which are connected by friction welding; the first connecting section is provided with the male connector and the square groove at the end away from the second connecting section; the second connecting section is provided with the female connector and the anti-slip texture at the end away from the first connecting section.

[0012] In one possible implementation, the outer diameter of the first connecting segment is the same as the outer diameter of the second connecting segment, and the inner diameter of the first connecting segment is smaller than the inner diameter of the second connecting segment.

[0013] In one possible implementation, the length of the riser drill pipe is 0.5-0.9m.

[0014] In one possible implementation, the tapers of the external thread and the internal thread in the threaded hole are 1:16.

[0015] Compared with the prior art, the beneficial effects of the riser drill pipe provided in this application are: The raised drilling pipe provided in this application has a male connector and a female connector at both ends. An annular stress-dispersing groove is provided at the root of the male connector. This groove reduces stress concentration at the root of the male connector, preventing breakage due to tension or torque, and improving the overall structural strength of the raised drilling pipe. Square grooves are formed on the outer wall of the raised drilling pipe, with four or six grooves in total. The square grooves make the cross-section of the raised drilling pipe at this location a regular square or regular hexagon, allowing operators to grip and tighten or loosen the pipe using a wrench. The outer wall of the raised drilling pipe has anti-slip textures extending along its axial direction. These textures increase the friction for gripping, facilitating manual installation and removal of the raised drilling pipe, and making it suitable for use in confined spaces and difficult-to-operate underground environments. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the riser drill pipe structure provided in Embodiment 1 of this application; Figure 2 This is a schematic diagram of the connection between two riser drill pipes provided in Embodiment 1 of this application; Figure 3 for Figure 2 Enlarged view of part A in the middle; Figure 4 This is a schematic diagram of the riser drill pipe structure provided in Embodiment 2 of this application; Figure 5 for Figure 4 Enlarged view of part B in the middle; Explanation of reference numerals in the attached figures: 1. Male connector; 2. Female connector; 3. Stress dispersion groove; 4. Square groove; 5. Anti-slip texture; 6. First sealing groove; 7. Rubber sealing ring; 8. Sealing boss; 9. Cylindrical surface; 10. Limiting boss; 11. First connecting section; 12. Second connecting section; 13. Conical surface. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0019] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0020] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0022] 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.

[0023] Please refer to the following: Figures 1 to 5 The following describes the reverse drilling pipe provided in the embodiments of this application.

[0024] Please see Figure 1 and Figure 2 As an embodiment of this application, the raise pipe is made of seamless steel pipe, with a male connector 1 and a female connector 2 at each end. Multiple raise pipes are connected sequentially through the male connector 1 and the female connector 2. The male connector 1 has an external thread, and the female connector 2 has a threaded hole adapted to the external thread; the taper of the external thread and the internal thread in the threaded hole are 1:16 respectively. An annular stress dispersion groove 3 is formed at the root of the male connector 1. The bottom diameter of the stress dispersion groove 3 is smaller than the outer diameter of the root of the male connector 1, and the cross-section of the stress dispersion groove 3 is arc-shaped. The stress dispersion groove 3 is transitionally positioned at the connection point with the male connector 1. The raise pipe has an inner hole that extends through its own axis, and the inner hole is used to transport drilling fluid.

[0025] The male connector 1 has an approximate frustum-shaped shape, with a specially constructed external thread on its outer circumference. The thread profile is an optimized trapezoid, with smooth rounded transitions at both the crest and root. This design effectively disperses stress, significantly enhances the thread's fatigue resistance, and can easily handle frequent connection and disassembly operations. The thread pitch is slightly smaller than that of conventional drill pipes, ensuring a tighter and more secure connection and effectively preventing loosening under harsh conditions of high vibration and high torque.

[0026] The inner wall of the female connector 2 has an internal thread that precisely matches the external thread of the male connector 1. The surface of the internal thread is nitrided to form a hard nitrided layer, which greatly improves wear resistance and corrosion resistance.

[0027] To facilitate the use of wrenches by construction personnel to hold the raise drill pipe, a square groove 4 is provided on the outer wall of the raise drill pipe at one end near the male connector 1. The square groove 4 is square in shape, and multiple square grooves 4 are spaced apart along the circumference of the raise drill pipe. In order to match the shape of a conventional wrench, the number of square grooves 4 is four or six.

[0028] To prevent slippage when gripping the drill pipe, anti-slip grooves 5 are provided on the outer wall of the raise pipe at one end near the female connector 2. The anti-slip grooves 5 extend along the axial direction of the raise pipe, and multiple anti-slip grooves 5 are spaced apart along the circumference of the raise pipe. The anti-slip grooves 5 can be elongated, serrated, or other shapes. There are no specific restrictions on the number, depth, or other parameters of the anti-slip grooves 5, as long as they can increase the friction for the gripping personnel.

[0029] There are no specific restrictions on the outer diameter of the raise pipe. The length of the raise pipe is usually 0.5-0.9m, but other lengths are also possible.

[0030] Compared with the prior art, the beneficial effects of the raise pipe provided in Embodiment 1 of this application are: The raise pipe provided in Embodiment 1 of this application has a male connector 1 and a female connector 2 at both ends. An annular stress dispersion groove 3 is provided at the root of the male connector 1. The stress dispersion groove 3 reduces stress concentration at the root of the male connector 1, preventing breakage due to tension or torque, and improving the overall structural strength of the raise pipe. Square grooves 4 are formed on the outer wall of the raise pipe, with four or six grooves. The square grooves 4 make the cross-section of the raise pipe at this location a regular quadrilateral or regular hexagon, allowing operators to grip and tighten or loosen the raise pipe using a wrench. Anti-slip textures 5 are provided on the outer wall of the raise pipe, extending axially along the raise pipe. These textures increase the friction for operators, facilitating manual installation and removal of the raise pipe, and making it suitable for use in confined spaces and inconvenient underground environments.

[0031] Please see Figure 2 and Figure 3The inner wall of the female connector 2 is provided with an annular first sealing groove 6. The cross-section of the first sealing groove 6 is square or trapezoidal, and the groove is used to accommodate the O-ring rubber sealing ring 7. When multiple raking pipes are connected end to end, the male connector 1 of the previous raking pipe is threaded into the female connector 2 of the next raking pipe and abuts against the rubber sealing ring 7 to prevent drilling fluid leakage.

[0032] Please see Figure 2 and Figure 3 The male connector 1 is provided with a sealing boss 8 at its end. The sealing boss 8 is annular. The male connector 1 has an arc-shaped surface, an outer conical surface and a cylindrical surface 9 in sequence from its root to its end. The outer conical surface has an external thread. The stress dispersion groove 3 is formed into an arc-shaped surface. The minimum diameter of the arc-shaped surface is smaller than the major diameter of the outer conical surface. The outer surface of the sealing boss 8 forms a cylindrical surface 9. The diameter of the cylindrical surface 9 is smaller than or equal to the minor diameter of the outer conical surface.

[0033] The sealing boss 8 serves two purposes: firstly, it guides the connection of multiple raiseshare drill pipes, allowing the male connector 1 to quickly and accurately engage with the female connector 2 during the connection process; secondly, after the sealing boss 8 is installed in place, it applies pressure to the rubber sealing ring 7 to achieve a seal.

[0034] Please see Figure 2 and Figure 3 When multiple raking pipes are connected end to end, the cylindrical surface 9 of the previous raking pipe abuts against the rubber sealing ring 7 inside the next raking pipe.

[0035] Please see Figure 4 and Figure 5 As a second embodiment of this application, the difference from the first embodiment is that the first sealing groove 6 is set in a different position. In the second embodiment, the inner wall of the threaded hole is provided with a limiting boss 10. The limiting boss 10 is annular. The first sealing groove 6 is opened on the side of the limiting boss 10 facing the opening of the threaded hole. When multiple raking drill pipes are connected end to end, the end face of the sealing boss 8 of the previous raking drill pipe abuts against the rubber sealing ring 7 in the next raking drill pipe.

[0036] Compared with the above embodiment 1, this application sets the first sealing groove 6 on the limiting boss 10 and uses the axial clamping force of two adjacent riser drill pipes for sealing, which has a better sealing effect and a lower risk of leakage.

[0037] Please see Figure 5As a second embodiment of this application, an annular second sealing groove is provided in the threaded hole near the end of the female connector 2. The second sealing groove is used to accommodate the rubber sealing ring 7. The first sealing groove 6 and the second sealing groove are distributed at intervals along the axial direction of the raise drill pipe. Both the first sealing groove 6 and the second sealing groove are provided with rubber sealing rings 7. The two rubber sealing rings 7 work together to provide a better sealing effect and prevent drilling fluid leakage.

[0038] The raise pipe can be made from a single steel pipe through cutting, or the raise pipe includes a first connecting section 11 and a second connecting section 12, which are connected by friction welding. The first connecting section 11 is provided with a male connector 1 and a square groove 4 at the end away from the second connecting section 12. The second connecting section 12 is provided with a female connector 2 and anti-slip texture 5 at the end away from the first connecting section 11.

[0039] The outer diameter of the first connecting section 11 is the same as the outer diameter of the second connecting section 12, while the inner diameter of the first connecting section 11 is smaller than the inner diameter of the second connecting section 12. During manufacturing, two steel pipes with different wall thicknesses are selected. The steel pipe with the larger wall thickness is used to machine the first connecting section 11 on a lathe, and the steel pipe with the smaller wall thickness is used to machine the second connecting section 12 on a lathe. Finally, the first connecting section 11 and the second connecting section 12 are joined together using friction welding. Friction welding is an existing technology, and its specific principles will not be elaborated upon.

[0040] In actual use, the first connecting section 11 with male connector 1 is more prone to damage. In order to improve the structural strength of the first connecting section 11, the wall thickness of the first connecting section 11 is designed to be greater than the wall thickness of the second connecting section 12. The first connecting section 11 has higher tensile, bending and torsional strength.

[0041] The first connecting section 11 and the second connecting section 12 are made of steel pipes with different wall thicknesses. The first connecting section 11 has a thicker wall and sufficient strength, while the second connecting section 12 has a thinner wall and is lighter in weight. This combination of structural strength and lightweight design helps to improve the overall performance of the product.

[0042] It is understood that the parts in the above embodiments can be freely combined or deleted to form different combined embodiments. The specific contents of each combined embodiment will not be repeated here. After this description, it can be considered that the present utility model specification has recorded each combined embodiment and can support different combined embodiments.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A raise boring pipe, characterized in that, The two ends of the raise drill pipe are respectively provided with a male connector (1) and a female connector (2). The male connector (1) has an external thread, and an annular stress dispersion groove (3) is opened at the root of the male connector (1). The bottom diameter of the stress dispersion groove (3) is smaller than the outer diameter of the root of the male connector (1). The female connector (2) has a threaded hole that matches the external thread. The raise drill pipe has an inner hole that penetrates its own axial direction. The outer wall of the reverse drilling rod has a square groove (4) at one end near the male connector (1), and a plurality of square grooves (4) are spaced apart along the circumferential direction of the reverse drilling rod. The number of square grooves (4) is four or six. The outer wall of the raise drill pipe is provided with anti-slip grooves (5) at one end near the female connector (2). The anti-slip grooves (5) extend along the axial direction of the raise drill pipe, and multiple anti-slip grooves (5) are spaced apart along the circumferential direction of the raise drill pipe.

2. The raise boring pipe according to claim 1, characterized in that, The inner wall of the female connector (2) is provided with an annular first sealing groove (6), which is used to accommodate the rubber sealing ring (7); when multiple raking drill pipes are connected end to end, the male connector (1) of the previous raking drill pipe is threadedly engaged with the female connector (2) of the next raking drill pipe and abuts against the rubber sealing ring (7).

3. The raise boring pipe according to claim 2, characterized in that, The male connector (1) is provided with a sealing boss (8) at its end. The sealing boss (8) is annular. The male connector (1) is provided with an arc-shaped surface, an outer conical surface and a cylindrical surface (9) in sequence from its root to its end. The outer conical surface has the external thread. The stress dispersion groove (3) forms the arc-shaped surface. The minimum diameter of the arc-shaped surface is smaller than the major diameter of the outer conical surface. The outer surface of the sealing boss (8) forms the cylindrical surface (9). The diameter of the cylindrical surface (9) is smaller than or equal to the minor diameter of the outer conical surface.

4. The raise boring pipe according to claim 3, characterized in that, When multiple riser pipes are connected end to end, the cylindrical surface (9) of the previous riser pipe abuts against the rubber sealing ring (7) inside the next riser pipe.

5. The raise boring pipe according to claim 3, characterized in that, The inner wall of the threaded hole is provided with a limiting boss (10), the limiting boss (10) is annular, and the first sealing groove (6) is opened on the side of the limiting boss (10) facing the opening of the threaded hole. When multiple raking drill pipes are connected end to end, the end face of the sealing boss (8) of the previous raking drill pipe abuts against the rubber sealing ring (7) inside the next raking drill pipe.

6. The raise boring pipe according to claim 5, characterized in that, The threaded hole has an annular second sealing groove at a position near the end of the female connector (2), and the second sealing groove is used to accommodate the rubber sealing ring (7).

7. The raise boring pipe according to claim 1, characterized in that, The riser drill pipe includes a first connecting section (11) and a second connecting section (12), which are connected by friction welding. The first connecting section (11) is provided with the male connector (1) and the square groove (4) at one end away from the second connecting section (12). The second connecting section (12) is provided with the female connector (2) and the anti-slip texture (5) at one end away from the first connecting section (11).

8. The raise boring pipe according to claim 7, characterized in that, The outer diameter of the first connecting segment (11) is the same as the outer diameter of the second connecting segment (12), and the inner diameter of the first connecting segment (11) is smaller than the inner diameter of the second connecting segment (12).

9. The raise boring pipe according to claim 1, characterized in that, The length of the riser drill pipe is 0.5-0.9m.

10. The raise boring pipe according to claim 1, characterized in that, The taper of the external thread and the internal thread in the threaded hole are 1:16.

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