Through-cable high-pressure composite directional drill pipe

Abstract

The application discloses a through-cable high-pressure composite directional drill rod, and relates to the technical field of drill rods. The through-cable high-pressure composite directional drill rod comprises a drill rod, a rod sealing ring and a signal transmission device. The drill rod is provided with a rod outer thread part and a rod inner thread hole. The rod sealing ring is sleeved on the outer circumferential surface of the end of the rod outer thread part away from the rod inner thread hole. The signal transmission device comprises a center through-cable device and a mounting structure. The center through-cable device comprises a conductive cable, a conductive male connector and a conductive female connector. The conductive male connector comprises a conductive protruding column and a conductive elastic element arranged on the outer circumferential surface of the conductive protruding column. The conductive elastic element is provided with a plurality of elastic sheet parts extending along the axial direction of the drill rod. The conductive female connector is provided with a conductive jack. The elastic sheet parts can elastically deform along the radial direction of the drill rod relative to the conductive protruding column. The diameter of the maximum circumscribed circle of the plurality of elastic sheet parts is greater than the hole diameter of the conductive jack. The technical scheme provided by the application can improve the electrical connection reliability of the center through-cable device and the pressure-bearing capacity of the drill rod joint.

Description

Technical Field

[0001] This invention relates to the field of drill pipe technology, and in particular to a cable-connected high-voltage composite directional drill pipe. Background Technology

[0002] A directional drilling pipe, also known as a measurement-while-drilling (MSD) pipe, is an integrated drill pipe consisting of a signal transmission device and the drill pipe itself. It can transmit drilling measurement signals in real time and effectively transfer the power head load to the drill bit at the bottom of the hole. The signal transmission device includes a central cable guide, an insulation device, and a support device. The central cable guide includes a conductive connector, a conductive cable, and a reducing spring. When multiple directional drilling pipes are connected, the reducing spring of the current directional drilling pipe is connected between the conductive male connector of that directional drilling pipe and the conductive female connector of the previous directional drilling pipe.

[0003] The insulation device includes an insulated male terminal and an insulated female terminal. The insulated male terminal protects one end of the cable core and the conductive male connector, while the insulated female terminal protects the other end of the cable core and the conductive male connector. The function of the insulation device is to isolate the central cable-carrying device from mud or other pressure media, protect the communication safety of the central cable-carrying device, and prevent communication signal loss during transmission.

[0004] The function of the support device is to fix the central cable-passing device and the insulation device axially, prevent the central cable-passing device and the insulation device from moving during drill pipe connection, and ensure the reliability of signal transmission.

[0005] In related technologies, directional drill pipes, due to their flat-threaded connection structure, suffer from insufficient load-bearing capacity, poor sealing performance, and weak resistance to combined loads. The electrical connection reliability of the central cable-passing device is poor, and it is susceptible to corrosion. Furthermore, the signal transmission device also has certain technical defects, including but not limited to: insufficient pressure-bearing capacity at the drill pipe connection; poor electrical connection reliability and susceptibility to corrosion in the central cable-passing device; bulky cable sheath structure of the conductive cable, making installation difficult; insufficient waterproof and pressure-bearing capacity of the conductive cable; poor connection stability between the conductive cable and the insulation device; and large size of the insulating male terminal.

[0006] Therefore, how to solve the above-mentioned technical defects of cable-driven drill rods is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] The main objective of this invention is to propose a cable-connected high-voltage composite directional drill rod, which aims to solve at least one of the aforementioned technical problems.

[0008] To achieve the above objectives, the present invention proposes a cable-connected high-voltage composite directional drill rod, comprising:

[0009] The drill rod has a hollow channel inside. Both ends of the drill rod are respectively provided with an external threaded part and an internal threaded hole. The external threaded part can be screwed to the internal threaded hole of the adjacent section of the cable-connected high-voltage composite directional drill rod. A rod sealing ring is fitted onto the outer circumferential surface of the end of the rod's external thread portion away from the rod's internal thread hole, and can elastically abut against the wall surface of the internal thread hole of an adjacent section of the cable-connected high-voltage composite directional drill rod; and A signal transmission device includes a central cable-connecting device and an installation structure. The central cable-connecting device is installed within a hollow channel via the installation structure. The central cable-connecting device includes a conductive cable and a conductive connector connecting the conductive cable. The conductive connector includes a conductive male connector and a conductive female connector located at opposite ends of the conductive cable. The conductive male connector includes a conductive protrusion and a conductive elastic element located on the outer circumferential surface of the conductive protrusion. The end of the conductive protrusion away from the conductive cable has a guide surface. The conductive elastic element has multiple spring-loaded portions extending axially along the drill rod. The multiple spring-loaded portions are spaced apart circumferentially along the drill rod. The conductive female connector has a conductive insertion hole. The spring-loaded portions can elastically deform relative to the conductive protrusion along the radial direction of the drill rod. The diameter of the largest circumscribed circle of the multiple spring-loaded portions is larger than the diameter of the conductive insertion hole.

[0010] In one embodiment, the guide surface is configured as an arcuate surface that convexes in a direction away from the conductive cable.

[0011] In one embodiment, the conductive protrusion, the conductive elastic element, and the conductive female connector are configured as nickel-plated copper conductors.

[0012] In one embodiment, the conductive elastic element further includes two collar portions, which are sleeved on the conductive protrusion, and a plurality of spring portions are connected between the two collar portions, with the middle portion of each spring portion raised in a direction away from the conductive protrusion.

[0013] In one embodiment, the collar portion is provided with an installation break, the collar portion is elastically deformable to change the opening size of the installation break, and the installation break is connected to the gap between two adjacent spring portions.

[0014] In one embodiment, the outer peripheral surface of the conductive protrusion is provided with a mounting ring groove, the collar portion is sleeved on the bottom surface of the mounting ring groove and received within the mounting ring groove, and at least one of the collar portions has an axial gap with the adjacent groove sidewall of the mounting ring groove.

[0015] In one embodiment, the conductive cable includes a cable core and a cable sheath sleeved on the outer circumferential surface of the cable core. The mounting structure includes an insulation device and a support device. The insulation device includes two insulating members disposed at opposite ends of the drill rod. One of the insulating members is at least sealed at the connection between the cable core and the conductive male connector, and the other insulating member is at least sealed at the connection between the cable core and the conductive female connector. The support device includes two support rings, and one of the insulating members is axially fixedly installed in the hollow channel through one of the support rings.

[0016] In one embodiment, one of the insulating components is configured as an insulating male end, which has a first mounting hole and an insulating insertion hole that are connected to each other. The conductive male connector also includes a mounting post connected to the end of the conductive protrusion near the conductive cable. One end of the cable core is connected to the mounting post in the first mounting hole. The conductive protrusion and the conductive elastic element are exposed in the insulating insertion hole and are spaced apart from the side wall of the insulating insertion hole to form an insertion space. The other insulating component is configured as an insulating female end, which includes an insulating protrusion corresponding to the insertion space. The insulating female end has a second mounting hole that penetrates the end face of the insulating protrusion away from the conductive cable. The conductive female connector is embedded in the second mounting hole, and the other end of the cable core is connected to the conductive female connector in the second mounting hole. When the insulating protrusion is inserted into the insertion space of an adjacent section of the high-voltage composite directional drill rod and is sealed with the side wall of the insulating insertion hole, the conductive insertion hole is inserted by the conductive protrusion of the adjacent section of the high-voltage composite directional drill rod.

[0017] In one embodiment, the cable sheath includes a main sheath and a reinforcing sheath. The main sheath includes a first layer and a second layer arranged sequentially from the inside to the outside. The first layer is configured as an elastic flexible tube, and the second layer is configured as a heat shrink tubing. One end of the reinforcing sheath is inserted into the first layer, and the other end of the reinforcing sheath extends into the insulation component.

[0018] In one embodiment, the first layer is made of polyurethane.

[0019] In one embodiment, the reinforcing sleeve is made of stainless steel; In one embodiment, the insulation device further includes two quick connectors and two locking nuts, with each quick connector and locking nut corresponding to an insulating component. The quick connector is threaded to the inner end of the insulating component, and the cable core and the reinforcing sheath pass through the quick connector and extend into the insulating component. The port edge of the main sheath surrounds the outer circumferential surface of the quick connector and is clamped by the quick connector and the locking nuts.

[0020] In one embodiment, the drill rod has an external threaded portion and an internal threaded hole at both ends, respectively. The external threaded portion can be threaded to the internal threaded hole of an adjacent section of the cable-connected high-voltage composite directional drill rod. Both the external threaded portion and the internal threaded hole are tapered threads, and the taper of the tapered thread ranges from 1:8 to 1:16.

[0021] In one embodiment, the outer circumferential surface of the external threaded portion of the rod is provided with a sealing ring groove, and the rod sealing ring is partially embedded in the sealing ring groove.

[0022] This invention, by incorporating conductive protrusions and multiple spring-loaded portions surrounding them, solves both the problems of unstable signal transmission and signal attenuation when the two drill pipes move axially and the problem of unstable signal transmission when the drill pipe and the conductive male connector are not coaxial. Compared to using a variable-diameter spring, this improves the electrical connection reliability of the central cable-carrying device. Furthermore, by adding a rod sealing ring to the drill pipe, the sealing performance at the connection point (i.e., the connection between the external thread and the internal thread hole) is improved, thereby reducing the risk of high-pressure drilling fluid leaking from the connection point. It can withstand a maximum pressure of 60 MPa of high-pressure drilling fluid, thus increasing the pressure-bearing capacity of the drill pipe connection. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a structural embodiment of the cable-connected high-voltage composite directional drill rod provided by the present invention; Figure 2 for Figure 1 The illustrated embodiment is a quarter-section view of the end where the conductive male connector is located. Figure 3 for Figure 1 The illustrated embodiment is a quarter-section view of the end where the conductive female connector is located. Figure 4 for Figure 1 Exploded view of the central cable-passing device inside the embodiment shown; Figure 5 for Figure 4 A magnified view of a section at point A in the middle; Figure 6 for Figure 4 A magnified view of a section at point B in the middle; Figure 7 for Figure 5 A schematic diagram of the structure of a conductive elastic element from another perspective; Figure 8 for Figure 1 The illustrated embodiment is shown in a partial cross-sectional view at the end where the conductive male connector is located. Figure 9 for Figure 1 The illustrated embodiment is shown in a partial cross-sectional view at the end where the conductive female connector is located.

[0025] Explanation of icon numbers: 100. Cable-connected high-voltage composite directional drill rod; 200. Drill rod; 201. Hollow channel; 202. External threaded part of the rod; 203. Internal threaded hole of the rod; 204. Third step; 205. Fourth step; 206. Positioning ring groove; 207. Sealing ring groove; 208. Rod sealing ring; 300. Signal transmission device; 400. Center cable guide device; 410. Conductive cable; 411. Cable core; 412. Cable sheath; 413. Main sheath; 414. Reinforcing sheath; 420. Conductive male connector; 421. Conductive protrusion; 422. Guide surface; 423. Mounting ring groove; 424. Conductive elastic element; 425. Spring part; 426. Loop part; 427. Mounting break; 428. Mounting post; 430. Conductive female connector; 431. Conductive socket; 500, Insulating device; 510, Insulating male terminal; 511, First mounting hole; 512, Insulating insertion hole; 513, Insertion space; 514, First step; 520, Insulating female terminal; 521, Insulating protrusion; 522, Second mounting hole; 523, Second step; 530, Quick connector; 540, Locking nut; 600, Support device; 610, Support ring; 611, Outer support ring; 612, Inner support ring; 613, Connecting column; 620, Mounting nut; 630, Elastic insert.

[0026] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0029] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0030] Cable-guided drill pipes, also known as directional drill pipes or measurement-while-drilling (MSWD) drill pipes, are integrated drill pipes consisting of a signal transmission device and the drill pipe itself. They can transmit borehole measurement signals in real time and effectively transfer the power head load to the drill bit at the bottom of the hole. Due to the harsh operating environment and complex geological conditions, cable-guided drill pipes require higher standards for signal transmission quality and drill pipe performance stability.

[0031] Composite directional drilling combines rotary drilling and directional drilling. Its significant difference from sliding directional drilling lies in the fact that the former involves both sliding and rotation, while the latter only involves sliding. Composite directional drilling combines these two drilling modes to form a composite directional trajectory control technology. For example, when the measured borehole trajectory deviates from the designed trajectory, the system switches to sliding mode to correct the deviation; when the borehole trajectory tends to be straight, it switches to rotary mode to improve efficiency. Through intelligent control, the two modes alternate, achieving the goal of "high efficiency and straightness maintenance."

[0032] During drilling, the downhole sensor at the bottom of the borehole needs to transmit data such as azimuth, dip, and geological parameters to the ground in real time. These signals are then transmitted back to the ground monitoring system in the form of electromagnetic signals through the metal cable core in the central cable-connecting device.

[0033] Drill pipes serve as the carrier for components such as the central cable guide device and are a primary condition for ensuring directional drilling operations; their performance directly determines the safety of the operation. In combined drilling operations, drill pipes not only bear enormous torque, tensile, and compressive loads but also frequent vibrations and impacts. This places extremely high demands on the threaded connection structure between adjacent drill pipes. Existing directional drill pipes often employ a flat-thread (parallel thread) design with a small taper (e.g., 1:30), which has the following technical drawbacks: (1) Insufficient load-bearing capacity: The stress distribution of flat thread is uneven, and stress concentration is easily generated at the root of the thread. Under high pressure torsion load and combined bending stress, it is easy to cause disengagement or shear failure of the thread teeth.

[0034] (2) Poor sealing performance: The small taper or flat thread design results in insufficient pressure on the mating surface of the thread pair. Under the action of high-pressure drilling fluid (above 30MPa, such as 50MPa or 60MPa), leakage channels are easily formed, leading to thread failure.

[0035] (3) Weak resistance to composite loads: Under the intense vibration and alternating loads generated by composite drilling, traditional threaded connection structures are prone to loosening, have short fatigue life, and are not suitable for long-cycle, high-intensity composite drilling operations.

[0036] Therefore, how to solve the problems of insufficient load-bearing capacity, poor sealing performance and weak resistance to combined loads caused by the use of flat thread and small taper thread connection structure in directional drill pipes is a problem that urgently needs to be solved by those skilled in the art.

[0037] The signal transmission device includes a central cable-passing device, an insulation device, and a support device. The central cable-passing device includes a conductive connector, a conductive cable, and a reducing spring (e.g., a conical compression spring). The conductive connector includes a conductive male connector and a conductive female connector. The conductive cable includes a cable core and a cable sheath. The cable core is connected between the conductive male and female connectors belonging to the same cable-passing drill pipe. When multiple cable-passing drill pipes are connected, the reducing spring of the current cable-passing drill pipe is connected between the conductive male connector of that drill pipe and the conductive female connector of the previous cable-passing drill pipe. This reducing spring can elastically deform along the axial direction of the drill pipe and is inserted into the socket of the conductive female connector in a compressed state. Therefore, if two adjacent cable-passing drill pipes experience axial movement, the reducing spring can maintain contact with the conductive female connector of the previous cable-passing drill pipe within its deformation stroke, thereby maintaining stable signal transmission. The function of the central cable-passing device is to transmit bidirectional communication signals between the bottom hole equipment (measuring while drilling) and the wellhead equipment (surface monitoring system). The annular space around the central cable-passing device is used as a flushing fluid channel. As the drill bit rotates, flushing fluid is forced into the flushing fluid channel to cool the drill bit and remove drill cuttings.

[0038] The insulation device includes an insulated male terminal and an insulated female terminal. The insulated male terminal protects one end of the cable core and the conductive male connector, while the insulated female terminal protects the other end of the cable core and the conductive male connector. The function of the insulation device is to isolate the central cable-carrying device from the mud or other pressurized media, protecting the communication safety of the central cable-carrying device and preventing signal loss during transmission. The function of the support device is to axially fix the central cable-carrying device and the insulation device, preventing movement of the central cable-carrying device and the insulation device during drill pipe connection, and ensuring the reliability of signal transmission.

[0039] Existing signal transmission devices have the following technical defects: (1) Poor electrical connection reliability and easy corrosion of the central cable-connecting device: Since the reducing spring is spirally formed along the axial direction of the drill rod, it will elastically deform along the axial direction when only subjected to axial force, and eccentrically bend when subjected to both axial and non-axial forces. Therefore, if the drill rod (the external threaded part) and the conductive male connector inside are not coaxial, during the connection and installation of the two drill rods, the reducing spring cannot be aligned coaxially with the conductive socket of the conductive female connector, and may be eccentrically bent due to the simultaneous application of axial and non-axial forces, for example, bending and deforming due to pressing against the outer edge of the conductive socket of the conductive female connector, thus preventing it from deforming and being inserted into place according to the preset trajectory. At this time, because the reducing spring will still undergo axial elastic deformation, the two drill rods are allowed to continue to be screwed into place, making it difficult for the user to discover that the reducing spring is not actually inserted into place. Thus, after the cable-connecting composite directional drill rod is connected and drilled downwards, when the two cable-connecting drill rods move axially, the reducing spring cannot maintain a stable connection with the conductive female connector, resulting in unstable signal transmission. Users only discover the signal transmission instability issue at this point, requiring the directional drill pipe to be pulled out for troubleshooting and replacement with a new one, significantly delaying drilling progress. In other words, the variable diameter spring can only address signal transmission instability and attenuation (or even interruption) when the two cable-carrying drill pipes move axially; it cannot resolve signal transmission instability when the drill pipe (its external thread) and the conductive male connector are not coaxial, resulting in poor electrical connection reliability of the central cable-carrying device. Furthermore, the variable diameter spring is prone to oxidation and electrochemical corrosion in humid or corrosive environments, leading to increased contact resistance, signal attenuation, and even open circuits, severely impacting the lifespan and electrical connection reliability of the central cable-carrying device.

[0040] (2) The cable sheath structure of conductive cables is bulky and difficult to install: As a support and protection structure for the cable core, the cable sheath is usually made of rubber material, which results in a large overall weight, large bending radius, and inconvenient installation, making it difficult to use in space-constrained situations.

[0041] (3) Insufficient waterproof and pressure-bearing capacity of conductive cables: Due to the relatively simple design of the cable sheath, the waterproof sealing performance of conductive cables is limited, and the pressure-bearing capacity can usually only reach about 10MPa, which cannot meet the needs of special industrial scenarios such as high-pressure oil fields and high-pressure water jets.

[0042] (4) Poor connection stability between conductive cable and insulation device: Under long-term vibration or external force, the connection between conductive cable and insulation device is prone to structural loosening, affecting the durability and stability of the connection.

[0043] (5) Large size of insulated male terminals: Existing insulated male terminals need to avoid large-diameter reducing springs, so the diameter of the insulated male terminal in this area is set to be large. At the same time, the insulated male terminal also completely wraps the end of the conductive cable (including the cable core and cable sheath), so the diameter of the insulated male terminal in this area is also set to be large. This is not conducive to the installation and wiring of insulated male terminals in narrow spaces.

[0044] Therefore, how to solve the above-mentioned technical defects of signal transmission devices is a problem that urgently needs to be solved by those skilled in the art.

[0045] In view of this, the present invention proposes a cable-connected high-voltage composite directional drill rod, which aims to solve at least one of the above-mentioned technical problems.

[0046] Please see Figures 1 to 3 ,in, Figure 2 for Figure 1 The illustrated embodiment is a quarter-section view of the end where the conductive male connector 420 is located. Figure 3 for Figure 1 The illustrated embodiment is a quarter-section view of the end where the conductive female connector 430 is located. It should be noted that... Figure 2 and Figure 3 The two perpendicular cutting planes used for the quarter section are not strictly product symmetry planes, in order to avoid the cable core 411, conductive male connector 420 and conductive female connector 430 being basically not cut and to show them in their entirety.

[0047] Please see Figures 1 to 3 In one embodiment of the present invention, the cable-guided high-voltage composite directional drill rod 100 includes a drill rod 200 and a signal transmission device 300. The drill rod 200 has a hollow channel 201 inside, and the signal transmission device 300 includes a central cable-guided device 400 and a mounting structure. The central cable-guided device 400 is installed in the hollow channel 201 through the mounting structure.

[0048] Please refer to the following: Figure 8 and Figure 9Optionally, the central cable-connecting device 400 includes a conductive cable 410 and a conductive connector connecting the conductive cable 410. The conductive connector includes a conductive male connector 420 and a conductive female connector 430 respectively disposed at opposite ends of the conductive cable 410. The conductive male connector 420 includes a conductive protrusion 421 and a conductive elastic element 424 disposed on the outer peripheral surface of the conductive protrusion 421. The conductive protrusion 421 has a guide surface 422 at one end away from the conductive cable 410. The conductive elastic element 424 has a plurality of spring pieces 425 extending axially along the drill rod 200. The plurality of spring pieces 425 are distributed circumferentially along the drill rod 200. The conductive female connector 430 has a conductive insertion hole 431. The spring pieces 425 can elastically deform relative to the conductive protrusion 421 along the radial direction of the drill rod 200. The diameter of the largest outer circle of the plurality of spring pieces 425 is larger than the diameter of the conductive insertion hole 431.

[0049] It should be noted that the largest circumcircle of the multiple spring pieces 425 refers to the circle that intersects with the point on each spring piece 425 that is furthest from the axis of the conductive protrusion 421.

[0050] Generally speaking, in practical applications, multiple cable-operated high-voltage composite directional drill pipes 100 are sequentially connected end-to-end according to the drilling progress. Therefore, the conductive male connector 420 and conductive female connector 430 on the same cable-operated high-voltage composite directional drill pipe 100 are not installed together, but rather connected to the conductive male connector 420 and conductive female connector 430 of the adjacent cable-operated high-voltage composite directional drill pipe 100. Furthermore, the conductive male connector 420 of the first cable-operated high-voltage composite directional drill pipe 100 (located at the bottom of the hole) is connected to the measurement-while-drilling (MWD) instrument, while the conductive female connector 430 of the last cable-operated high-voltage composite directional drill pipe 100 (located at the borehole opening) is connected to the ground monitoring system. In this way, during drilling, the MWD instrument at the bottom of the borehole can transmit data such as azimuth, dip angle, and geological parameters in real time back to the ground monitoring system in the form of electromagnetic signals via the central cable-operated device 400 of the multiple cable-operated high-voltage composite directional drill pipes 100.

[0051] For ease of explanation, the following description will use the following example to illustrate the installation relationship: the conductive male connector 420 on the same cable-connected high-voltage composite directional drill rod 100 is connected to the conductive female connector 430 of the previous cable-connected high-voltage composite directional drill rod 100, and the conductive female connector 430 is connected to the conductive male connector 420 of the subsequent cable-connected high-voltage composite directional drill rod 100.

[0052] Based on this, since the diameter of the largest outer circle of the multiple spring pieces 425 is larger than the diameter of the conductive socket 431, when the two sections of the cable-connected high-voltage composite directional drill rod 100 are connected, the spring pieces 425 can elastically abut against the side wall of the conductive socket 431 of the previous section of the cable-connected high-voltage composite directional drill rod 100. That is, during the process of inserting the spring pieces 425 into the conductive socket 431 of the previous section of the cable-connected high-voltage composite directional drill rod 100, they undergo radial elastic deformation due to the reaction force from the edge of the conductive socket 431 until the diameter of the largest outer circle of the multiple spring pieces 425 shrinks to a state equal to the diameter of the conductive socket 431, thereby allowing the conductive elastic element 424 to be inserted into the conductive socket 431. After the conductive elastic element 424 is inserted into place, the spring pieces 425 maintain a certain elastic tension and can tightly abut against the side wall of the conductive socket 431.

[0053] It is understandable that the conductive protrusion 421 plays a crucial role in the process of inserting the conductive elastic element 424 into the conductive female connector 430.

[0054] If the drill rod 200 (its external threaded portion 202) and its internal conductive male connector 420 are not coaxial, during the connection and installation of the two drill rods 200, the conductive protrusion 421 (and the conductive elastic element 424) cannot be coaxially aligned with the conductive socket 431 of the conductive female connector 430. This misalignment can be further analyzed from two aspects: Firstly, if the misalignment between the conductive protrusion 421 and the conductive socket 431 is not significant, it can still be smoothly inserted into the conductive socket 431 under the guidance of the guide surface 422. During insertion, the multiple spring portions 425 of the conductive elastic element 424 undergo radial elastic deformation, and after insertion, the multiple spring portions 425 elastically abut against different circumferential positions on the hole wall of the conductive socket 431. That is, the multiple spring portions 425 can automatically adjust their radial shape during insertion, thereby compensating for the radial gap difference when the conductive protrusion 421 and the conductive socket 431 are not completely coaxial, ensuring a stable and reliable connection even when they are not completely aligned, thereby ensuring the stability of signal transmission.

[0055] Secondly, if the conductive protrusion 421 is significantly off-axis from the conductive socket 431, causing it to be completely blocked by the outer edge of the conductive socket 431 and unable to continue advancing, the conductive protrusion 421 is a rigid structure and cannot undergo axial elastic deformation. Therefore, it will prevent the two directional drill rods 200 from completing the screw connection. The user will find that at least one of the two currently connected directional drill rods 200 has a problem where the external thread 202 of the rod is not aligned with the conductive protrusion 421. The problematic directional drill rod 200 can be replaced in time to avoid discovering the problem only after the cable high-voltage composite directional drill rod 100 has been connected and drilling has begun. Then, the directional drill rod 200 can be pulled out and the drilling progress delayed due to the problem can be investigated.

[0056] It is understandable that if the conductive protrusion 421 is not provided, and only the conductive elastic element 424 is provided, then when the conductive male connector 420 and the conductive socket 431 are significantly misaligned, the conductive elastic element 424 will be completely pressed against the outer edge of the opening of the conductive socket 431, resulting in axial elastic deformation, and allowing the two directional drill rods 200 to continue to complete the screw connection. The user will then miss the opportunity to discover that the conductive elastic element 424 is not properly inserted, and will have to pull out the directional drill rod 200 to troubleshoot and replace the faulty directional drill rod 200 when unstable signal transmission is subsequently discovered. In other words, the same problem as with the variable diameter spring will be repeated.

[0057] It should be noted that since the contact point between the spring piece 425 and the wall of the conductive socket 431 is located in the middle region of the conductive socket 431 in the axial direction, the spring piece 425 can maintain an elastic contact with the wall of the conductive socket 431 when the two cable drill rods 200 move axially. Only the contact position will change. This can solve the problems of unstable signal transmission and signal attenuation when the two cable drill rods 200 move axially.

[0058] As can be seen, the technical solution of the present invention, by setting the conductive protrusion 421 and multiple spring pieces 425 surrounding the conductive protrusion 421, can solve the problems of unstable signal transmission and signal attenuation when the two cable-carrying drill rods 200 move axially, and can also avoid the problem of unstable signal transmission when the drill rod 200 and the conductive male connector 420 are not coaxial. Compared with the solution using a variable diameter spring, it can improve the electrical connection reliability of the central cable-carrying device 400.

[0059] Optionally, in some embodiments, the conductive protrusion 421, the conductive elastic element 424, and the conductive female connector 430 are made of nickel-plated copper conductors. The copper conductor can be pure copper or a copper alloy. Further, the copper alloy can be, but is not limited to, phosphor bronze, beryllium copper, etc., to combine good conductivity and elastic deformation properties. For example, the conductive elastic element 424 can be made of nickel-plated phosphor bronze or beryllium copper. Thus, the nickel plating layer on the outside of the copper conductor effectively isolates the copper conductor from contact with air and moisture, thereby solving the problem of electrochemical corrosion. The nickel plating layer also further enhances the surface hardness and durability of these components, thereby extending the service life of the central cable connection device 400 in harsh environments. Secondly, the excellent conductivity of the copper conductor itself ensures a low-resistance, low-loss electrical connection. Therefore, it can significantly improve the corrosion resistance and electrical connection reliability of adjacent central cable connection devices 400 at the joint.

[0060] Please see Figure 8 Optionally, in some embodiments, the guide surface 422 is configured as an arcuate surface that protrudes in a direction away from the conductive cable 410. This further enhances the guiding effect of the guide surface 422, allowing the conductive protrusion 421 to be inserted more smoothly into the conductive socket 431. Of course, in other embodiments, the guide surface 422 can also be a pyramidal surface.

[0061] Please see Figure 7 Optionally, in some embodiments, the conductive elastic element 424 further includes two collar portions 426, which are sleeved on the conductive protrusion 421. Multiple spring portions 425 are connected between the two collar portions 426, with the middle portion of each spring portion 425 protruding away from the conductive protrusion 421. In this embodiment, the largest circumcircle of the multiple spring portions 425 refers to the circle that intersects with the outermost point of the middle portion of each spring portion 425. Thus, the conductive elastic element 424 has a stable and reliable structure, and the radial elastic deformation capability of the spring portions 425 can be stably exerted. Furthermore, both ends of the spring portions 425 are close to the conductive protrusion 421, and the middle portion protrudes outward, which facilitates the insertion and removal operations of the conductive male connector 420 and the conductive plug.

[0062] Please refer to the following: Figure 5 and Figure 8Optionally, in some embodiments, the outer peripheral surface of the conductive protrusion 421 is provided with a mounting annular groove 423, and the collar portion 426 is sleeved on the bottom surface of the mounting annular groove 423 and received within the mounting annular groove 423. At least one set of collar portions 426 has an axial clearance with the adjacent groove sidewall of the mounting annular groove 423. In this way, receiving the collar portion 426 within the mounting annular groove 423 can prevent the conductive elastic element 424 from being accidentally subjected to axial external force, ensuring that the conductive elastic element 424 can be inserted into the conductive socket 431, and also preventing the conductive elastic element 424 from accidentally detaching from the conductive protrusion 421. Of course, in other embodiments, the mounting annular groove 423 may not be provided, and both collar portions 426 may be welded and fixed to the conductive protrusion 421.

[0063] Please see Figure 7 Optionally, in some embodiments, the collar portion 426 is provided with an installation break 427. The collar portion 426 can elastically deform to change the opening size of the installation break 427, and the installation break 427 communicates with the gap between two adjacent spring portions 425. In this way, the diameter of the collar portion 426 can be changed, so that the collar portion 426 can be more easily fitted into the conductive protrusion 421. For example, the collar portion 426 can first be coaxially aligned with the conductive protrusion 421, and then slide axially against the guide surface 422. During this sliding contact process, the opening size of the installation break 427 gradually increases until the collar portion 426 crosses the guide surface 422 and enters the mounting ring groove 423. At this time, the opening size of the installation break 427 returns to its original value or is slightly larger than the initial value. Of course, in other embodiments, the installation break 427 may not be provided.

[0064] Please see Figures 4 to 6 Optionally, in some embodiments, the conductive cable 410 includes a cable core 411 and a cable sheath 412 sleeved on the outer circumferential surface of the cable core 411. The installation structure includes an insulation device 500 and a support device 600. The insulation device 500 includes two insulating members disposed at opposite ends of the drill rod 200. One insulating member is at least sealed at the connection between the cable core 411 and the conductive male connector 420, and the other insulating member is at least sealed at the connection between the cable core 411 and the conductive female connector 430. The support device 600 includes two support rings 610, and an insulating member is axially fixedly installed in the hollow channel 201 through one of the support rings 610. Thus, the structure is simple and easy to implement. Of course, in other embodiments, the installation structure can also take other forms, as long as it can achieve the installation and fixation of the central cable-carrying device 400 in the drill rod 200. This application does not make specific limitations in this regard.

[0065] Please refer to the following: Figure 8 and Figure 9Optionally, in some embodiments, one insulating element is configured as an insulating male terminal 510, which has a communicating first mounting hole 511 and an insulating insertion hole 512. The conductive male connector 420 also includes a mounting post 428 connected to one end of the conductive protrusion 421 near the conductive cable 410. One end of the cable core 411 is connected to the mounting post 428 in the first mounting hole 511. The conductive protrusion 421 and the conductive elastic element 424 are exposed in the insulating insertion hole 512 and are spaced apart from the sidewall of the insulating insertion hole 512 to form an insertion space 513. The other insulating element is configured as an insulating female terminal 520, which includes a... An insulating protrusion 521 is provided in the insertion space 513. The insulating female end 520 is provided with a second mounting hole 522. The second mounting hole 522 penetrates the end face of the insulating protrusion 521 away from the conductive cable 410. The conductive female connector 430 is embedded in the second mounting hole 522. The other end of the cable core 411 is connected to the conductive female connector 430 in the second mounting hole 522. When the insulating protrusion 521 is inserted into the insertion space 513 of the adjacent section of the high-voltage composite directional drill rod 100 and is sealed with the side wall of the insulating insertion hole 512, the conductive insertion hole 431 is inserted by the conductive protrusion 421 of the adjacent section of the high-voltage composite directional drill rod 100.

[0066] Specifically, the insulating protrusion 521 on the same cable-carrying high-voltage composite directional drill rod 100 is inserted into the insertion space 513 of the preceding cable-carrying high-voltage composite directional drill rod 100, and its insertion space 513 is supported by the insulating protrusion 521 of the following cable-carrying high-voltage composite directional drill rod 100. Through the tight insertion and fit between the insulating protrusion 521 and the insulating socket 512, good protection and isolation can be provided for the conductive connectors and conductive cables 410 located within them. The structure is simple and easy to install and operate.

[0067] Please see Figure 8 and Figure 9 Optionally, in some embodiments, the cable sheath 412 includes a main sheath 413 and a reinforcing sheath 414. The main sheath 413 includes a first layer and a second layer arranged sequentially from the inside to the outside (the first layer and the second layer are not clearly marked in the figures). The first layer is configured as an elastic flexible tube, and the second layer is configured as a heat shrink tubing. One end of the reinforcing sheath 414 is inserted into the first layer, and the other end of the reinforcing sheath 414 extends into the insulation.

[0068] On the one hand, the composite protection structure of the cable core 411 is composed of elastic flexible tubing and heat shrink tubing. The elastic flexible tubing serves as the first sealing barrier, and the heat shrink tubing tightly wraps around the elastic flexible tubing and cable core 411 after being heated and shrunk, forming the second sealing barrier. Together, they form a dual waterproof system of "elastic body + tight wrapping", which can improve the protection effect of the main sheath 413 on the cable core 411 and reduce the risk of damage to the conductive cable 410.

[0069] On the other hand, the reinforced sheath 414 can reinforce the key parts of the conductive cable 410 and the conductive connector, so that the overall pressure resistance of the central cable device 400 is increased to more than 30MPa, far exceeding the market average of 10MPa. It can withstand extreme pressure environments and meet the needs of special industrial scenarios such as high-pressure oil fields and high-pressure water jets.

[0070] Optionally, the first layer is made of polyurethane (PU). That is, the first layer is a PU flexible tube. PU flexible tubes possess good elasticity and flexibility, providing dynamic cushioning and elastic support for the cable core 411. They are more adaptable to scenarios with small bending radii and easier to install, making them more suitable for use in space-constrained environments. Furthermore, the cable core 411 can use high-performance copper wire, whose good ductility further improves the ease of installation of the conductive cable 410. Secondly, using a polymer material (i.e., polyurethane) instead of rubber significantly reduces the overall weight of the conductive cable 410. Of course, in other embodiments, the first layer can also be made of other polymer materials with lower density and better elastic deformation capabilities; this application does not specifically limit this.

[0071] Optionally, in some embodiments, the reinforcing sleeve 414 is made of stainless steel. This provides both good structural strength and improved corrosion resistance. Of course, in other embodiments, the reinforcing sleeve 414 may be made of other metallic or non-metallic materials, and this application does not impose specific limitations on this.

[0072] Please see Figure 5 , Figure 6 , Figure 8 and Figure 9 Optionally, in some embodiments, the insulation device 500 further includes two quick connectors 530 and two locking nuts 540. The quick connectors 530 and locking nuts 540 are correspondingly provided with the insulating components. The quick connectors 530 are threaded to the inner end of the insulating components. The cable core 411 and the reinforcing sheath 414 pass through the quick connectors 530 and extend into the insulating components. The port edge of the main sheath 413 surrounds the outer circumferential surface of the quick connectors 530 and is clamped by both the quick connectors 530 and the locking nuts 540. The outer diameter of the main sheath 413 is larger than the diameter of the first mounting hole 511 and the outer diameter of the second mounting hole 522.

[0073] On the one hand, the insulating male terminal 510 does not need to completely wrap the end of the conductive cable 410 (including the cable core 411 and the cable sheath 412), but only wraps the cable core 411. Therefore, its diameter in this area can be set to be smaller, which helps to reduce the volume of the insulating male terminal 510. On the other hand, since the outer diameter of the conductive protrusion 421 and the conductive elastic element 424 is small, the diameter of the insulating male terminal 510 in this area is also set to be smaller, which helps to reduce the volume of the insulating male terminal 510.

[0074] It is understandable that the insulating female terminal 520, since it only wraps around the cable core 411, can have a smaller diameter in the corresponding area, thus reducing its size and weight. Both the insulating male terminal 510 and the insulating female terminal 520 of this application are designed with a compact structure. This facilitates the installation and wiring of the insulating male terminal 510 and the insulating female terminal 520 in confined spaces.

[0075] It is worth mentioning that both the insulated male terminal 510 and the insulated female terminal 520 integrate a quick connector 530 and a locking nut 540. The quick connector enables a "plug-and-play" function, facilitating the assembly of the conductive cable 410 with the insulated male terminal 510 and the insulated female terminal 520. Furthermore, the locking nut 540 provides secondary mechanical locking, effectively preventing loosening due to vibration and improving the connection stability between the conductive cable 410 and the insulated male terminal 510 and the insulated female terminal 520.

[0076] Without loss of generality, please refer to Figure 5 , Figure 6 , Figure 8 and Figure 9 The support ring 610 includes an outer support ring 611, an inner support ring 612, and at least two connecting posts 613. The connecting posts 613 connect the outer support ring 611 and the inner support ring 612, and the at least two connecting posts 613 are distributed at intervals along the circumference of the drill pipe 200. The one of the two support rings 610 installed on the insulating male end 510 is defined as the male end support ring 610, and the one installed on the insulating female end 520 is defined as the female end support ring 610.

[0077] Furthermore, the insulating male end 510 is provided with a first step 514 corresponding to the inner support ring 612 of the male end support ring 610, and the drill rod 200 is provided with a third step 204 corresponding to the outer support ring 611 of the male end support ring 610. The end face of the outer support ring 611 of the male end support ring 610 away from the conductive elastic element 424 abuts against the third step 204, and the end face of the inner support ring 612 of the male end support ring 610 close to the conductive elastic element 424 abuts against the first step 514.

[0078] Furthermore, the insulating female end 520 is provided with a second step 523 corresponding to the inner support ring 612 of the female end support ring 610, and the drill rod 200 is provided with a fourth step 205 corresponding to the outer support ring 611 of the female end support ring 610. The end face of the outer support ring 611 of the female end support ring 610 away from the conductive socket 431 abuts against the fourth step 205, and the end face of the inner support ring 612 of the female end support ring 610 away from the conductive socket 431 abuts against the second step 523.

[0079] Furthermore, the support device 600 also includes two mounting nuts 620, one of which is threadedly connected to the insulated male end 510 and abuts against the end face of the inner support ring 612 of the male end support ring 610 away from the conductive elastic element 424. That is, the mounting nut 620 cooperates with the first step 514 to jointly clamp the inner support ring 612, thereby achieving axial fixation of the male end support ring 610 and the central cable-passing device 400.

[0080] Furthermore, another mounting nut 620 is threadedly connected to the insulating female end 520 and abuts against the end face of the inner support ring 612 of the female end support ring 610 near the conductive socket 431. That is, the mounting nut 620 cooperates with the second step 523 to jointly clamp the inner support ring 612, thereby achieving axial fixation of the female end support ring 610 and the central cable-passing device 400.

[0081] Furthermore, the support device 600 also includes an elastic insert 630 disposed on the outer periphery of the female end support ring 610. The outer diameter of the elastic insert 630 in its natural state is larger than the outer diameter of the female end support ring 610, and it can elastically deform in the radial direction. The inner wall surface of the hollow channel 201 of the drill rod 200 is provided with a positioning ring groove 206 corresponding to the elastic insert 630, and the elastic insert 630 can elastically engage with the positioning ring groove 206.

[0082] Specifically, when assembling the center cable guide device 400 into the drill pipe 200, a mounting nut 620 can be used to pre-lock and fix the male end support ring 610 onto the insulated male end 510. Then, the center cable guide device 400, equipped with the male end support ring 610, extends into the drill pipe 200 from the end of the drill pipe 200 where the external thread portion 202 is provided. At this time, the conductive female connector 430 of the center cable guide device 400 enters the drill pipe 200 first. The center cable guide device 400 is then further advanced so that the conductive female connector 430 moves along the hollow channel 201 to the end of the drill pipe 200 where the internal thread hole 203 is provided. Next, the end of the female end support ring 610 with the internal threaded hole 203 of the self-drilling rod 200 is inserted into the drill rod 200 until the outer support ring 611 of the female end support ring 610 abuts against the fourth step 205 and the inner support ring 612 abuts against the second step 523. During this process, the elastic insert 630 on the female end support ring 610 first elastically deforms to reduce its outer diameter, and then elastically deforms again to expand its outer diameter when it aligns with the positioning ring groove 206, thereby elastically locking into the positioning ring groove 206. It can be understood that the male end support ring 610, the female end support ring 610, and the elastic insert 630 work together to achieve axial fixation of the central cable-passing device 400 on the hollow channel 201.

[0083] Please see Figure 2 and Figure 3 Optionally, in some embodiments, the drill rod 200 has an external threaded portion 202 and an internal threaded hole 203 at both ends. The external threaded portion 202 can be threadedly connected to the internal threaded hole 203 of an adjacent section of cable-carrying high-voltage composite directional drill rod 100. Both the external threaded portion 202 and the internal threaded hole 203 are tapered threads, and the taper of the tapered thread ranges from 1:8 to 1:16. That is, in this embodiment, the threaded connection structure between two adjacent drill rods 200 adopts a large-tapered tapered thread form instead of a flat thread form.

[0084] On the one hand, the large taper design allows the load to be distributed more evenly across all thread teeth during tightening, significantly reducing stress concentration at the end of the thread teeth and thus improving overall fatigue strength and load-bearing capacity. Simultaneously, the large taper design generates extremely high and uniform contact stress across the entire tapered surface of the threaded pair after tightening, forming multiple metal-to-metal sealing barriers that effectively resist high-pressure drilling fluids exceeding 30 MPa. On the other hand, the tapered thread structure produces a significant "wedge-tightening effect," where the threaded pair tightens further under tensile loads, effectively preventing disengagement. The wedge-tightening effect and the large frictional torque ensure that the connection structure maintains preload even under severe vibration, preventing loosening. Furthermore, it significantly enhances resistance to torsion and combined bending moments, ensuring the structural integrity and reliability of the threaded connection during frequent switching between directional and rotary drilling modes.

[0085] Thus, by using tapered threads with a taper range of 1:8 to 1:16, the tensile, compressive, and torsional strengths and fatigue resistance of the threaded connection structure can be significantly improved, the sealing performance of the threaded connection can be enhanced, it can adapt to the high-pressure drilling fluid environment, optimize stress distribution, reduce stress concentration, and is particularly suitable for high-intensity composite drilling processes.

[0086] Please see Figure 2 and Figure 3 Optionally, in some embodiments, the cable-connected high-pressure composite directional drill pipe 100 further includes a rod sealing ring 208. The rod sealing ring 208 is sleeved on the outer peripheral surface of the end of the external threaded portion 202 away from the internal threaded hole 203, and can elastically abut against the hole wall surface of the internal threaded hole 203 of the adjacent cable-connected high-pressure composite directional drill pipe 100. In this way, by adding a rod sealing ring 208 to the drill pipe 200, the sealing performance of the two drill pipes 200 at the connection point (i.e., the position where the external threaded portion 202 and the internal threaded hole 203 are connected) can be improved, thereby reducing the risk of high-pressure drilling fluid flowing inside the drill pipe 200 leaking out from the connection point. It can withstand the pressure of high-pressure drilling fluid up to 60 MPa, that is, it can improve the pressure-bearing capacity of the drill pipe 200 connection point.

[0087] Please see Figure 8 Optionally, in some embodiments, the outer peripheral surface of the external thread portion 202 of the rod is provided with a sealing ring groove 207, and the rod sealing ring 208 is partially embedded in the sealing ring groove 207. This facilitates the installation and positioning of the rod sealing ring 208, and the structure is simple and easy to implement. Of course, in other embodiments, the sealing ring groove 207 may not be provided.

[0088] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A cable-carrying high-voltage composite directional drill rod, characterized in that, include: The drill rod has a hollow channel inside. Both ends of the drill rod are respectively provided with an external threaded part and an internal threaded hole. The external threaded part can be screwed to the internal threaded hole of the adjacent section of the cable-connected high-voltage composite directional drill rod. A rod sealing ring is fitted onto the outer circumferential surface of the end of the rod's external thread portion away from the rod's internal thread hole, and can elastically abut against the wall surface of the internal thread hole of an adjacent section of the cable-connected high-voltage composite directional drill rod; and A signal transmission device includes a central cable-connecting device and an installation structure. The central cable-connecting device is installed within a hollow channel via the installation structure. The central cable-connecting device includes a conductive cable and a conductive connector connecting the conductive cable. The conductive connector includes a conductive male connector and a conductive female connector located at opposite ends of the conductive cable. The conductive male connector includes a conductive protrusion and a conductive elastic element located on the outer circumferential surface of the conductive protrusion. The end of the conductive protrusion away from the conductive cable has a guide surface. The conductive elastic element has multiple spring-loaded portions extending axially along the drill rod. The multiple spring-loaded portions are spaced apart circumferentially along the drill rod. The conductive female connector has a conductive insertion hole. The spring-loaded portions can elastically deform relative to the conductive protrusion along the radial direction of the drill rod. The diameter of the largest circumscribed circle of the multiple spring-loaded portions is larger than the diameter of the conductive insertion hole.

2. The cable-connected high-voltage composite directional drill rod as described in claim 1, characterized in that, The guide surface is configured as an arc surface that protrudes in a direction away from the conductive cable; And / or, the conductive protrusion, the conductive elastic element, and the conductive female connector are made of nickel-plated copper conductors.

3. The cable-connected high-voltage composite directional drill rod as described in claim 1, characterized in that, The conductive elastic element further includes two collar portions, which are sleeved on the conductive protrusions. A plurality of spring portions are connected between the two collar portions, and the middle part of the spring portion is raised in a direction away from the conductive protrusions.

4. The cable-connected high-voltage composite directional drill rod as described in claim 3, characterized in that, The collar portion is provided with an installation break, and the collar portion can elastically deform to change the opening size of the installation break. The installation break is connected to the gap between two adjacent spring portions.

5. The cable-connected high-voltage composite directional drill rod as described in claim 4, characterized in that, The outer peripheral surface of the conductive protrusion is provided with an mounting ring groove. The collar portion is sleeved on the bottom surface of the mounting ring groove and housed within the mounting ring groove. At least one of the collar portions has an axial gap with the adjacent sidewall of the mounting ring groove.

6. The cable-connected high-voltage composite directional drill rod as described in any one of claims 1 to 5, characterized in that, The conductive cable includes a cable core and a cable sheath sleeved on the outer circumference of the cable core. The mounting structure includes an insulation device and a support device. The insulation device includes two insulating components disposed at opposite ends of the drill rod. One of the insulating components is at least sealed at the connection between the cable core and the conductive male connector, and the other insulating component is at least sealed at the connection between the cable core and the conductive female connector. The support device includes two support rings, and one of the insulating components is axially fixedly installed in the hollow channel through one of the support rings.

7. The cable-connected high-voltage composite directional drill rod as described in claim 6, characterized in that, One of the insulating components is configured as an insulating male terminal, which has a first mounting hole and an insulating insertion hole that are connected to each other. The conductive male terminal also includes a mounting post connected to one end of the conductive protrusion near the conductive cable. One end of the cable core is connected to the mounting post in the first mounting hole. The conductive protrusion and the conductive elastic component are exposed in the insulating insertion hole and are spaced apart from the side wall of the insulating insertion hole to form an insertion space. Another insulating component is configured as an insulating female end, which includes an insulating protrusion corresponding to the insertion space. The insulating female end has a second mounting hole, which penetrates the end face of the insulating protrusion away from the conductive cable. The conductive female connector is embedded in the second mounting hole, and the other end of the cable core is connected to the conductive female connector in the second mounting hole. When the insulating protrusion is inserted into the insertion space of an adjacent section of the cable-carrying high-voltage composite directional drill rod and is sealed with the side wall of the insulating insertion hole, the conductive insertion hole is inserted by the conductive protrusion of the adjacent section of the cable-carrying high-voltage composite directional drill rod.

8. The cable-connected high-voltage composite directional drill rod as described in claim 6, characterized in that, The cable sheath includes a main sheath and a reinforcing sheath. The main sheath includes a first layer and a second layer arranged sequentially from the inside to the outside. The first layer is configured as an elastic flexible tube, and the second layer is configured as a heat shrink tubing. One end of the reinforcing sheath is inserted into the first layer, and the other end of the reinforcing sheath extends into the insulation component.

9. The cable-connected high-voltage composite directional drill rod as described in claim 8, characterized in that, The first layer is made of polyurethane; And / or, the reinforcing sleeve is made of stainless steel; And / or, the insulation device further includes two quick connectors and two locking nuts, the quick connectors and the locking nuts being provided one-to-one with the insulation components, the quick connectors being threaded to the inner end of the insulation components, the cable core and the reinforcing sheath passing through the quick connectors and extending into the insulation components, the port edge of the main sheath surrounding the outer peripheral surface of the quick connectors and being clamped by the quick connectors and the locking nuts.

10. The cable-connected high-voltage composite directional drill rod as described in any one of claims 1 to 5, characterized in that, Both the external threaded portion of the rod and the internal threaded hole of the rod are tapered threads, and the taper of the tapered thread ranges from 1:8 to 1:

16. And / or, the outer circumferential surface of the external threaded portion of the rod is provided with a sealing ring groove, and the rod sealing ring is partially embedded in the sealing ring groove.

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