Strengthened thread large-torque fluted line built-in cable-passing drill rod

Abstract

The invention provides a reinforced thread large-torque fluted line built-in through cable drill rod, and belongs to the technical field of drill rods. Comprising a drill rod, the two ends of the drill rod are provided with a strengthening head and an insulation coupling end respectively, and threads are machined on the outer wall of the drill rod; the core rod is coaxially arranged in the drill rod, and a conductor which is coaxially arranged is installed in the core rod in an embedded mode; an insulation sealing sleeve is arranged in the strengthening head, a buckle is fixed on the outer side of the insulation sealing sleeve in a surrounding mode, the insulation sealing sleeve is fixed in the strengthening head through the buckle, a spiral spring is arranged in the insulation sealing sleeve, and the spiral spring is connected with the conductor in the core rod through a connecting piece. The problems that in the prior art, a drill rod is insufficient in torque bearing, cables are prone to being damaged and signal transmission is unstable can be solved, and the use effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of drill rods, and in particular to a drill rod with reinforced thread, large torque groove and built-in cable. Background Art

[0002] In the field of directional drilling construction such as underground directional drilling construction in coal mines, ground and tunnel near-horizontal engineering drilling, the drill rod is a very critical equipment component. With the development of drilling engineering, the performance requirements for drill rods are increasing. For example, in the long-distance gas extraction drilling and water exploration drilling process, the drill rod needs to work under complex geological conditions and faces many challenges such as high torque, different temperature environments, and signal transmission stability.

[0003] At present, traditional drill pipes mostly adopt API standard thread and center cable design, which can meet the needs of conventional working conditions, but in deep wells, hard rock formations or complex trajectory directional drilling, there are generally problems such as insufficient torque bearing, easy cable damage and unstable signal transmission. For example, the thread design of traditional drill pipes has not been specially strengthened. In high-torque working environments, such as drilling in deep formations or encountering hard rock layers, the threads are prone to wear, and due to the lack of an effective stress dispersion structure, stress concentration is prone to occur at the root of the thread, which further reduces the torque bearing capacity of the drill pipe, making the drill pipe prone to damage when subjected to large torque, thereby affecting the progress of the entire drilling project.

[0004] Therefore, the present application provides a reinforced threaded high-torque grooved built-in cable drill rod to solve the above technical problems. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a reinforced threaded high-torque grooved built-in cable drill rod to solve the problems of insufficient torque bearing, easy cable damage and unstable signal transmission in the drill rod of the prior art.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A reinforced threaded high torque grooved internal cable drill rod, comprising:

[0008] A drill rod, wherein both ends of the drill rod are respectively provided with a reinforced head and an insulating coupling end, and the outer wall of the drill rod is processed with threads;

[0009] A core rod, the core rod is coaxially arranged inside the drill rod, and a coaxially arranged conductor is embedded and installed inside the core rod;

[0010] An insulating and sealing sleeve is arranged inside the strengthening head. A buckle is fixedly arranged around the outer side of the insulating and sealing sleeve and is fixed inside the strengthening head through the buckle. A spiral spring is arranged inside the insulating and sealing sleeve, and the spiral spring is connected with the conductor inside the core rod through a connecting piece.

[0011] As a further technical solution, the thread is processed by a double-gradient strengthening process, including: surface ion nitriding, with a nitrided layer depth of 0.3 - 0.5 mm and a surface hardness of not less than HRC60. A spiral stress diffusion groove is machined at the root of the thread, with a groove depth of 1.0 - 1.5 mm and a pitch of 6 - 10 mm.

[0012] As a further technical solution, the inclination angle of the thread is 30° - 60°, and the groove pattern spacing is 4 - 6 mm, which is used to enhance the torsional strength and mud flow efficiency.

[0013] As a further technical solution, the conductor inside the core rod includes a silver-plated copper core, and the conductivity is not less than 58 MS / m.

[0014] As a further technical solution, the insulating and sealing sleeve is made of polyether ether ketone, and the temperature resistance range is 40°C - 200°C.

[0015] As a further technical solution, the spiral spring is a conical compression spring, and the spring wire diameter is 0.5 - 1.0 mm, and the free length is 20 - 30 mm, which is used to compensate the axial displacement during the rotation of the drill pipe and maintain the continuous transmission of signals.

[0016] As a further technical solution, the buckle is a stainless steel double-locking mechanism, and radial elastic claws are arranged on the buckle to limit the displacement of the buckle, and the maximum deflection angle is ±5°.

[0017] As a further technical solution, the connecting piece includes a double-sealing structure, namely a fluororubber sealing ring and a metal extrusion ring. The fluororubber sealing ring is the inner seal, and the pressure resistance performance is not less than 50 MPa. The metal extrusion ring is the outer seal of the sealing ring, and auxiliary sealing is realized through axial pre-tightening force.

[0018] As a further technical solution, an electromagnetic shielding layer is arranged inside the insulating coupling end, and the material is nickel-plated copper foil, with a thickness of 0.1 - 0.3 mm, and the shielding effectiveness is not less than 60 dB, and the frequency range is 1 MHz - 1 GHz.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] 1. In the above solution, the present invention processes the thread by adopting a double-gradient strengthening process, making the thread more wear-resistant and not easily damaged in a high-torque environment, improving the overall service life of the drill pipe. Moreover, in cooperation with the spiral stress diffusion groove machined at the root of the thread, it can effectively disperse stress and avoid thread damage caused by stress concentration, further enhancing the stability of the drill pipe during high-torque operation.

[0021] Meanwhile, with the design that the inclination angle of the thread is 30° - 60° and the groove pitch is 4 - 6 mm, it can effectively enhance the torsional strength, enabling the drill pipe to withstand a greater torque force during the drilling process. At the same time, it improves the mud flow efficiency, which is beneficial for chip removal and cooling during the drilling process.

[0022] 2. In the above solution, the present invention sets the core rod and the conductor, ensuring the high efficiency and stability of signal transmission through high conductivity and ensuring the two-way real-time communication quality between the downhole measurement probe and the surface explosion-proof computer.

[0023] Meanwhile, in cooperation with the insulating and sealing sleeve, it can maintain good performance within a wide temperature range, ensuring that it can still play a good insulating and sealing role in different working environments, especially in the case of large temperature changes that may exist downhole.

[0024] 3. In the above solution, the present invention adopts a conical compression spring, enabling the drill pipe to compensate for axial displacement during rotation, ensuring that even if the drill pipe has a small axial displacement during the drilling process, the signal can be continuously transmitted, improving the reliability of the entire drill pipe system.

[0025] Meanwhile, in cooperation with the setting of the buckle and the elastic claws arranged on the buckle, by restricting the displacement of the buckle, the insulating and sealing sleeve is fixed more firmly in the strengthening head, ensuring the stability of the internal structure and preventing the internal components from loosening or displacing during high-torque operation.

[0026] 4. In the above solution, by setting a connecting piece with a double-sealing structure for connection, it ensures good sealing performance in a high-pressure environment, preventing drilling fluid, etc. from entering the interior and affecting signal transmission and the normal operation of components.

[0027] Meanwhile, in cooperation with the electromagnetic shielding layer arranged in the insulating coupling end, it can effectively shield external electromagnetic interference, ensuring the accuracy and stability of internal signal transmission.

[0028] In summary, the present invention can solve the problems of insufficient torque bearing, easy damage of cables, and unstable signal transmission existing in the drill pipes of the prior art, and has good use effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present invention, and together with the specification are further used to explain the principles of the present invention and enable those skilled in the relevant art to implement and use the present invention.

[0030] Figure 1 is a schematic structural diagram of the present invention;

[0031] Figure 2 is a schematic diagram of the disassembled structure of the present invention;

[0032] Figure 3 is a schematic structural diagram of the core rod of the present invention;

[0033] Figure 4 is a schematic diagram of the internal structure of the core rod of the present invention;

[0034] Figure 5 is a schematic diagram of the internal structure of the present invention;

[0035] Figure 6 is of the present invention Figure 5 is an enlarged schematic diagram of the structure at A in the present invention.

[0036] [Reference numerals]

[0037] 1, drill pipe; 101, thread; 2, reinforcement head; 3, insulating coupling end; 4, core rod; 401, conductor; 5, insulating sealing sleeve; 6, buckle; 7, helical spring; 8, connecting piece.

[0038] As shown in the figure, in order to clearly implement the structure of the embodiments of the present invention, specific structures and devices are marked in the figure, but this is only for schematic needs and is not intended to limit the present invention to this specific structure, device and environment. Those of ordinary skill in the art can adjust or modify these devices and environments according to specific needs. Detailed implementation manners

[0039] The following describes in detail a reinforced threaded large-torque grooved internal cable drill pipe provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also implement them in other alternative ways; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0040] It should be noted that in the specification, the mention of "an embodiment", "embodiments", "exemplary embodiments", "some embodiments", etc. indicates that the described embodiments may include specific features, structures or characteristics, but not necessarily every embodiment includes such specific features, structures or characteristics. Additionally, when combining embodiments to describe a specific feature, structure or characteristic, the implementation of such feature, structure or characteristic in combination with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the relevant art.

[0041] Generally, terms can be understood, at least in part, from their use in the context. For example, at least in part depending on the context, the term "one or more" as used herein can be used to describe any feature, structure or characteristic in a singular sense, or can be used to describe a combination of features, structures or characteristics in a plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey a set of exclusive factors, but rather can alternatively, at least in part depending on the context, allow for the existence of other factors that are not necessarily explicitly described.

[0042] It can be understood that the meanings of "on", "above" and "over" in the present invention should be interpreted in the broadest manner, such that "on" not only means "directly on" something, but also includes the meaning of being "on" something with intervening features or layers therebetween, and "above" or "over" not only means "above" or "over" something, but also can include the meaning of being "above" or "over" something with no intervening features or layers therebetween.

[0043] Furthermore, spatial relative terms such as "under", "below", "lower", "above", "upper", etc. are used herein for convenience of description to describe the relationship of one element or feature to another or other elements or features, as shown in the drawings. The spatial relative terms are intended to cover different orientations in the use or operation of the device in addition to the orientation depicted in the drawings. The device can be oriented in other ways, and the spatial relative descriptive terms used herein can be correspondingly interpreted similarly.

[0044] As Figures 1-6 shown, the embodiments of the present invention provide a reinforced threaded large-torque grooved internal power drill pipe, comprising:

[0045] Drill pipe 1, with a strengthening head 2 and an insulating coupling end 3 respectively provided at both ends of the drill pipe 1. An electromagnetic shielding layer is provided inside the insulating coupling end 3, made of nickel-plated copper foil, with a thickness of 0.1 - 0.3 mm, a shielding effectiveness of not less than 60 dB, and a frequency range of 1 MHz - 1 GHz. And the outer wall of the drill pipe 1 is processed with threads 101, and the threads 101 are treated with a double-gradient strengthening process, including surface ion nitriding, with a nitrided layer depth of 0.3 - 0.5 mm and a surface hardness of not less than HRC60. And a spiral stress diffusion groove is processed at the root of the threads 101, with a groove depth of 1.0 - 1.5 mm and a pitch of 6 - 10 mm. Specifically in implementation, the inclination angle of the threads 101 is 30° - 60°, and the groove pitch is 4 - 6 mm, which is used to enhance the torsional strength and the mud flow efficiency.

[0046] Core rod 4, the core rod 4 is coaxially arranged inside the drill pipe 1, and a coaxially arranged conductor 401 is embedded and installed inside the core rod 4. Among them, the conductor 401 inside the core rod 4 includes a silver-plated copper core, with a conductivity of not less than 58 MS / m.

[0047] An insulating sealing sleeve 5 is arranged inside the strengthening head 2. A buckle 6 is fixedly arranged around the outside of the insulating sealing sleeve 5 and is fixed inside the strengthening head 2 through the buckle 6. And a spiral spring 7 is arranged inside the insulating sealing sleeve 5, and the spiral spring 7 is connected to the conductor 401 inside the core rod 4 through a connecting member 8. Among them, the insulating sealing sleeve 5 is made of polyether ether ketone, with a temperature resistance range of 40°C - 200°C. And the spiral spring 7 is a conical compression spring, with a spring wire diameter of 0.5 - 1.0 mm and a free length of 20 - 30 mm, which can be used to compensate for the axial displacement during the rotation of the drill pipe and maintain continuous signal transmission.

[0048] In addition, in this embodiment, the buckle 6 is a stainless steel two-way locking mechanism. Radial elastic claws are arranged on the buckle 6 to limit the displacement of the buckle 6, and the maximum deflection angle is ±5°. And the connecting member 8 includes a double-sealing structure, namely a fluororubber sealing ring and a metal extrusion ring. The fluororubber sealing ring is the inner seal, with a pressure resistance performance of not less than 50 MPa, and the metal extrusion ring is the outer seal ring, and auxiliary sealing is achieved through an axial pre-tightening force.

[0049] The working principle provided by the present invention for this reinforced threaded large-torque grooved internal cable drill pipe requires prior assembly during use. First, the core rod 4 is coaxially installed inside the drill pipe 1 to ensure that the conductor 401 nested inside the core rod 4 is properly installed. Then, an insulating sealing sleeve 5 is installed inside the reinforcement head 2, and the buckle 6 fixed around the outer side of the insulating sealing sleeve 5 is fixedly connected to the inside of the reinforcement head 2, so that the insulating sealing sleeve 5 is firmly located inside the reinforcement head 2. At the same time, the helical spring 7 is connected to the conductor 401 inside the core rod 4 through the connector 8, and the fluororubber sealing ring and the metal extrusion ring inside the connector 8 should be installed in the correct order to ensure the sealing performance. Finally, an insulating coupling end 3 is installed at the other end of the drill pipe 1 to ensure that the electromagnetic shielding layer inside the insulating coupling end 3 is correctly installed.

[0050] During the actual use process, such as in directional drilling construction in coal mines, when the drill pipe 1 is used for drilling operations, under high-torque working conditions, due to the special design of the thread 101, the drill pipe 1 can stably transmit torque and will not have problems such as thread loosening or damage.

[0051] At the same time, during the drilling process, when the mud passes through the grooves of the thread 101, due to the reasonable design of the groove spacing and the inclination angle, the mud flow efficiency is high, which can effectively carry the drill cuttings out of the borehole and cool the drill pipe at the same time.

[0052] As the drill pipe rotates, the helical spring 7 plays a role in compensating for axial displacement. For example, when the drill pipe generates an axial displacement of ±3 mm (within the compensation range of the spring) due to formation changes or other reasons, the helical spring 7 can maintain a stable connection with the conductor 401 through its own compression or elongation, thereby ensuring continuous signal transmission, enabling the downhole measurement probe to accurately transmit various drilling parameters to the surface explosion-proof computer through the conductor 401.

[0053] During the entire operation process, the insulating sealing sleeve 5 can still maintain good insulation and sealing performance in different temperature environments, such as when the downhole temperature rises from 40 °C to 150 °C, due to its polyether ether ketone material, preventing external substances from entering and affecting the internal structure. And when there is electromagnetic interference downhole, the electromagnetic shielding layer inside the insulating coupling end 3 can effectively shield electromagnetic interference with a frequency of 500 kHz (within the range of 1 MHz - 1 GHz), ensuring the accuracy of signal transmission. At the same time, the double-sealing structure of the connector 8 can ensure the sealing of the internal structure under the high-pressure environment that may exist downhole, preventing drilling fluid from entering.

[0054] In summary, the present invention can solve the problems of insufficient torque bearing, easy damage of cables, and unstable signal transmission existing in the drill pipes of the prior art, and has good use effects.

[0055] The present invention encompasses any alternatives, modifications, equivalent methods, and solutions made within the spirit and scope of the present invention. To enable the public to have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention. However, those skilled in the art can fully understand the present invention even without the description of these details. Additionally, well-known methods, processes, procedures, components, and circuits, etc. are not described in detail to avoid unnecessary confusion to the essence of the present invention.

[0056] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A reinforced threaded large-torque grooved internal cable drill pipe, characterized in that, Comprising: A drill pipe (1), with a strengthening head (2) and an insulating coupling end (3) respectively arranged at both ends of the drill pipe (1), and a thread (101) machined on the outer wall of the drill pipe (1); A core rod (4), the core rod (4) is coaxially arranged inside the drill pipe (1), and a conductor (401) arranged coaxially is embedded in the core rod (4); An insulating sealing sleeve (5) is arranged inside the strengthening head (2), a buckle (6) is fixedly arranged around the outer side of the insulating sealing sleeve (5), and is fixed inside the strengthening head (2) through the buckle (6), and a spiral spring (7) is arranged inside the insulating sealing sleeve (5), and the spiral spring (7) is connected to the conductor (401) inside the core rod (4) through a connecting piece (8).

2. The reinforced threaded high-torque grooved internal cable drill pipe according to claim 1, wherein, The thread (101) is processed by a double-gradient strengthening process, including: surface ion nitriding, the nitrided layer depth is 0.3 - 0.5 mm, the surface hardness is not less than HRC60, and a spiral stress diffusion groove is machined at the root of the thread (101), the groove depth is 1.0 - 1.5 mm, and the pitch is 6 - 10 mm.

3. The reinforced threaded large-torque grooved internal cable-drilling rod according to claim 2, characterized in that, The inclination angle of the thread (101) is 30° - 60°, and the groove pattern spacing is 4 - 6 mm, which is used to enhance the torsional strength and the mud flow efficiency.

4. The enhanced threaded large-torque grooved internal cable drill pipe according to claim 1, wherein The conductor (401) inside the core rod (4) includes a silver-plated copper core, and the conductivity is not less than 58 MS / m.

5. The reinforced threaded large-torque grooved internal cable drill pipe according to claim 1, characterized in that, The insulating sealing sleeve (5) is made of polyether ether ketone, and the temperature resistance range is 40°C - 200°C.

6. The reinforced threaded large-torque grooved internal cable drill pipe according to claim 1, wherein The spiral spring (7) is a conical compression spring, and the spring wire diameter is 0.5 - 1.0 mm, and the free length is 20 - 30 mm, which is used to compensate the axial displacement during the rotation of the drill pipe and maintain the continuous transmission of signals.

7. The reinforced threaded large-torque grooved internal cable drill pipe according to claim 1, wherein, The buckle (6) is a stainless steel double-locking mechanism, and radial elastic claws are arranged on the buckle (6) to limit the displacement of the buckle (6), and the maximum deflection angle is ±5°.

8. The enhanced threaded large-torque grooved internal cable-drilling pipe according to claim 1, characterized in that, The connecting piece (8) includes a double-sealing structure, which are respectively a fluororubber sealing ring and a metal extrusion ring, and the fluororubber sealing ring is the inner seal, and the pressure resistance performance is not less than 50 MPa, and the metal extrusion ring is the outer seal ring, and the auxiliary seal is realized through the axial pre-tightening force.

9. The reinforced threaded large-torque grooved internal cable drill pipe according to claim 1, characterized in that, An electromagnetic shielding layer is arranged inside the insulating coupling end (3), the material is nickel-plated copper foil, the thickness is 0.1 - 0.3 mm, the shielding effectiveness is not less than 60 dB, and the frequency range is 1 MHz - 1 GHz.

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