Power drill rod for underground electrification

Abstract

The invention relates to the field of oil and gas well drilling, in particular to a power drill rod for underground electrification. Comprising a body, two ends of the body are respectively provided with a female joint and a male joint, and the body is circumferentially provided with a plurality of cable grooves or holes; the female joint and the male joint are respectively provided with a connecting channel matched with the cable groove or hole, and the cable groove or hole and the connecting channel form a cable channel; an electrified cable is placed in the cable channel; the end part of the connecting channel is provided with a cable end part placing groove. A conducting ring with an insulating ring is arranged in each cable end placing groove, and the two ends of the power-on cable are connected with the conducting rings to be powered on. The electrified cable is connected through the conducting ring, so that good contact, large contact area and small power loss are realized; and the electrified cable is arranged on the outer wall of the drill rod, and the electrified cable is not in contact with other objects irrelevant to power transmission, so that the stability of the electrified cable is improved.

Description

Technical Field

[0001] The invention relates to the field of oil and gas drilling, and in particular to a power drill rod for underground electrification. Background Art

[0002] During oil drilling operations, cables are used to transmit power to downhole motors and control components. For example, the invention patent application for downhole electric drilling drill pipe with application publication number CN107701120A discloses that the cable used in the prior art is placed in the cavity of the drill pipe, and the drilling fluid used to clean broken rocks is transported in the cavity of the drill pipe. The cable will be soaked in the drilling fluid for a long time, and the stability of the cable cannot be guaranteed; the cable will also affect the flow of the drilling fluid in the drill pipe.

[0003] Therefore, the present application is to invent a power drill pipe for underground power supply, which separates the integrated wires, reduces the diameter or thickness of the wires, places the wires inside the drill pipe wall, improves the stability of the cable, and ensures the strength of the drill pipe. Summary of the invention

[0004] The first object of the present invention is to provide a power drill pipe for underground power supply, which solves the problem of unstable conductivity of the power cable in the current power drill pipe.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is:

[0006] A power drill pipe for underground power supply comprises a body, wherein two ends of the body are respectively provided with a female joint and a male joint; a plurality of cable grooves are arranged on the body along the circumferential direction; the female joint and the male joint are respectively provided with connection channels adapted to the cable grooves, and the cable grooves and the connection channels form a cable channel; a powered cable is placed in the cable channel; a cable end placement groove is provided at the end of the connection channel; a conductive ring with an insulating ring is respectively arranged in each cable end placement groove, and the two ends of the powered cable are respectively connected to the conductive ring for power supply.

[0007] Furthermore, the outer diameters of the male connector and the female connector are larger than the outer diameter of the main body, the female connector arranged on the main body is threadedly connected to the male connector arranged on another main body, or the male connector arranged on the main body is threadedly connected to the female connector arranged on another main body, and the conductive ring on the female connector is adapted to the conductive ring on the male connector and is in contact with electricity.

[0008] Furthermore, the contact surface between the conductive ring of the female connector and the conductive ring of the male connector is a plane.

[0009] Furthermore, the contact surface between the conductive ring of the female connector and the conductive ring of the male connector is a wedge-shaped inclined surface.

[0010] Furthermore, the conductive ring of the female connector and the conductive ring of the male connector are respectively arranged on the cable end placement groove through elastic members, and the elastic members are provided with through holes, and the powered cables pass through the through holes to connect with the conductive rings for power supply.

[0011] Furthermore, the conductive ring is wedge-shaped, a buffer groove is provided on a side of the conductive ring with a larger thickness, and an elastic member is arranged in the buffer groove.

[0012] Furthermore, the cable troughs are evenly distributed along the circumference of each body, and each cable trough is slotted along the axial direction of the body.

[0013] Furthermore, the main body is cylindrical and hollow, and the cable slot is opened on the outer wall of the main body.

[0014] Furthermore, the cable troughs are respectively provided with arc-shaped guard plates, and each guard plate is respectively connected to the main body.

[0015] Furthermore, the depth of the cable trough is greater than or equal to the height of the powered cable, and the cable trough includes a cable placement trough and a groove, the groove is located on the outer wall of the body, the cable placement trough is located at the bottom of the groove, and the guard plate is adapted in the groove in an arc shape.

[0016] Furthermore, the depth of the cable trough is less than the height of the energized cable, and a cable limiting groove adapted to the cable trough is opened on the guard plate; the guard plate is integrally formed, including a connecting part and a reinforcing part, the connecting part is located on both sides of the reinforcing part, and the connecting part is connected to the main body.

[0017] Furthermore, a protective cover is disposed on the main body, and the protective cover is cylindrical and hollow.

[0018] Furthermore, the depth of the cable trough is greater than or equal to the height of the energized cable, and the inner wall of the sheath is in contact with the outer wall of the body.

[0019] Furthermore, the depth of the cable trough is smaller than the height of the energized cable, the inner wall of the sheath fits on the outer surface of the energized cable, and the sheath is connected to the body via reinforcing ribs.

[0020] Furthermore, the body is integrally formed, including a convex portion and a base portion, and the convex portions are evenly distributed along the circumference of the base portion; and the cable grooves are opened on the convex portions one by one.

[0021] Furthermore, a cable trough is opened on the outer wall of the convex part, and the cable trough includes a cable placing trough and a groove, the groove is located on the outer wall of the main body, the cable placing trough is located at the bottom of the groove, and the guard plate is adapted in the groove.

[0022] Furthermore, the female connector has a cavity with an internal thread; the outer side of the cavity is stepped, including a first step and a second step, the first step is adjacent to the cavity, and the second step is located outside the first step; the cable end placement groove on the female connector is located on the first step.

[0023] Furthermore, the male connector has a convex body with an external thread; the outer side of the convex body is stepped, including a third step and a fourth step, the third step is adjacent to the convex body, and the fourth step is located on the outer side of the third step; the cable end placement groove on the male connector is located on the third step.

[0024] Another object of the present invention is to provide a downhole power drill pipe for electrification, so that the electrification cable is placed inside the outer wall of the body.

[0025] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is:

[0026] A power drill pipe for underground power supply, comprising a body, with a female connector and a male connector respectively arranged at both ends of the body; a plurality of cable holes are arranged on the body along the circumference, and the female connector and the male connector are respectively provided with connection channels adapted to the cable holes, and the cable holes and the connection channels form a cable channel, and a powered cable is respectively placed in each of the cable channels; a cable end placement groove is respectively provided at the end of each of the connection channels; a conductive ring is respectively arranged in each of the cable end placement grooves through an insulating ring, and the two ends of the powered cable are respectively connected to the conductive ring for power supply; the body is integrally formed, and comprises a convex portion and a base portion, and the convex portions are evenly distributed along the circumference of the base portion;

[0027] The cable hole is opened in the convex part.

[0028] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0029] The present invention has three cable channels on each power drill pipe, and three power cables of three-phase electricity are placed in the cable channels respectively, and the two ends of each power cable are respectively contacted and connected with the conductive ring and energized. The female connector of the body is threadedly connected with the male connector of another body, and the conductive ring on the female connector is adapted to the conductive ring on the male connector, and contacts and conducts electricity. During field operation, the power cable transmits electricity to the conductive ring of the male connector of the body, and then the power cable in the body transmits electricity to the conductive ring of the female connector of the body, the conductive ring of the female connector of the body contacts and conducts electricity with the conductive ring on the male connector of another body, and then the power cable of another body transmits the power of the male connector of another body to the conductive ring on the female connector of another body, so as to form a connection between the cables, and then realize the connection of the power channel. The power cable of the present invention is connected through the conductive ring, which realizes good contact, large contact area and small power loss; the power cable is placed on the outer wall of the power drill pipe, and the power cable does not contact other objects irrelevant to power transmission, thereby improving the stability of the power cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a front view cutaway diagram of a power drill pipe for underground power supply.

[0031] Figure 2 A top view of a power drill pipe for underground power supply.

[0032] Figure 3 for Figure 2 Cross-section along AA.

[0033] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0034] Figure 5 Schematic diagram of placing slots for cable ends.

[0035] Figure 6 Schematic diagram of conductive ring contact with a flat contact surface.

[0036] Figure 7 Schematic diagram of conductive ring contact with an inclined contact surface.

[0037] Figure 8 Schematic diagram of the contact of a planar conductive ring with an elastic member.

[0038] Fig. 9 Schematic diagram of elastic member.

[0039] Fig.10 Schematic diagram of the contact of the inclined conductive ring with an elastic member.

[0040] Fig.11 Schematic diagram of two wedge-shaped conductive rings about to touch.

[0041] Fig.12 Schematic diagram of the contact state of the wedge-shaped conductive ring.

[0042] Fig.13 This is a schematic diagram of a powered cable passing through a through hole of an elastic member and contacting a conductive ring.

[0043] Fig.14 This is a front view cutaway diagram of a power drill pipe with a curved cover plate.

[0044] Fig.15 For along Fig.14 Cross-section of the BB.

[0045] Fig.16 This is a schematic diagram of the cable trough.

[0046] Fig.17 It is a cross-sectional view of a cable trough with a curved cover and powered cables that are not completely buried.

[0047] Fig.18 For along Fig.17 Cross-section of CC.

[0048] Fig.19This is a front view cutaway of a power drill pipe with a cylindrical cover and powered cables completely buried in the cable trough.

[0049] Fig. 20 For along Fig.19 Cross-section of DD.

[0050] Fig.21 This is a front view cutaway of a power drill pipe with a cylindrical cover and powered cables not completely buried in the cable trough.

[0051] Fig. 22 For along Fig.21 Cross-section diagram of EE.

[0052] Fig.23 This is a front view cutaway diagram of the main body with a convex portion and the powered cable completely buried in the cable hole.

[0053] Fig.24 For along Fig.23 Cross-section of the FF.

[0054] Fig.25 A front view of the main body with a convex part and the powered cable not completely buried in the cable trough

[0055] Fig.26 For along Fig.25 Cross-section of GG. DETAILED DESCRIPTION

[0056] Example 1

[0057] like Figures 1 to 4 As shown, in order to improve the stability of the power cable, the present application proposes a solution of placing the power cable on the outer wall of the power drill pipe, so that the power cable does not need to contact objects irrelevant to power transmission, and the placement environment of the power cable is purified; specifically, a power drill pipe for underground power supply includes a body 1, and the two ends of the body 1 are respectively provided with a female connector 2 and a male connector 3; Figure 5As shown, three cable troughs 4 are arranged circumferentially on each body 1, and the cable troughs 4 are evenly distributed along the circumference of each body 1. The central angle between the center lines of adjacent cable troughs 4 is 120°, and each cable trough 4 is slotted axially along the body 1. The female connector 2 and the male connector 3 are respectively provided with connection channels 5 adapted to the cable troughs 4, and the connection channels 5 are specifically through holes. The cable troughs 4 and the connection channels 5 form a cable channel, and a powered cable is placed in each of the cable channels; a cable end placement groove 7 is provided at the end of each of the connection channels 5; the remaining amount of the powered cable is placed in the cable end placement groove 7 to prevent the two ends of the powered cable from having poor contact with the conductive ring 8. A conductive ring 8 is arranged in each cable end placement groove 7 through an insulating ring 9, and the insulating ring 9 and the conductive ring 8 are located above the remaining powered cable. The two ends of the powered cable are respectively connected to the conductive ring 8 for power supply, and the material of the conductive ring 8 is copper or other conductive materials with good conductivity. The female connector 2 has a cavity with an internal thread; the outer side of the cavity is stepped, including a first step 21 and a second step 22, the first step 21 is adjacent to the cavity, and the second step 22 is located outside the first step 21; the cable end placement groove 7 on the female connector 2 is located on the first step 21, and the second step 22 can provide protection for the conductive ring 8 on the female connector 2. The male connector 3 has a convex body with an external thread; the outer side of the convex body is stepped, including a third step 31 and a fourth step 32, the third step 31 is adjacent to the convex body, and the fourth step 32 is located outside the third step 31; the fourth step 32 can protect the conductive ring 8 on the male connector 3. The cable end placement groove 7 on the male connector 3 is located on the third step 31. The inner diameters of both ends of the body 1 become smaller, and when the drilling fluid in the body 1 is about to pass through the male connector 3 or the female connector 2, the inner diameter will gradually become smaller, forming a buffer slope 10, to prevent the drilling fluid from generating excessive force when passing through the male connector 3 or the female connector 2, affecting the coordination between the energized cable and the conductive ring 8.

[0058] During field operation, the female connector 2 provided on the main body 1 is threadedly connected with the male connector 3 provided on another main body 1, or the male connector 3 provided on the main body 1 is threadedly connected with the female connector 2 provided on another main body 1, and the conductive ring 8 on the female connector 2 is matched with the conductive ring 8 on the male connector 3, and the conductive ring 8 is in contact with the conductive ring 8 on the male connector 3. The conductive cable transmits power to the conductive ring 8 provided on the male connector 3 provided on the main body, and then the conductive cable in the main body transmits power to the conductive ring 8 provided on the female connector 2 provided on the main body 1, and the conductive ring 8 provided on the female connector 2 of the main body contacts and conducts electricity with the conductive ring 8 provided on the male connector 3 of another main body 1, and then the conductive cable of another main body 1 transmits power from the male connector 3 of another main body 1 to the conductive ring 8 provided on the female connector 2 of another main body 1, so that the cables are connected, and then the power channel is connected.

[0059] like Figure 6The contact surface of the conductive ring 8 of the female connector 2 and the conductive ring 8 of the male connector 3 can be a plane, and the contact surface of the conductive ring 8 is flush with the second step 22 or the fourth step 32. After the body is threadedly connected with another body, the female connector 2 on the body and the male connector 3 on the other body will contact and be energized. Or the male connector 3 on the body and the female connector 2 on the other body will contact and be energized.

[0060] like Figure 7 As shown, the contact surface between the conductive ring 8 of the female connector 2 and the conductive ring 8 of the male connector 3 can also be a wedge-shaped inclined surface. When the body 1 is threadedly connected with another body 1, the torque generated by the thread and the thrust generated by the wedge-shaped inclined conductive ring 8 opposite to the torque will make the conductive ring 8 directly fit more closely and the conductive stability higher.

[0061] Since the main body and the other body are connected by threads, during the rotation of the other body, the conductive ring 8 on the main body and the conductive ring 8 on the other body will be worn, and the contact area of ​​the conductive ring 8 may become smaller after long-term use. Since the conductive performance is related to the contact area of ​​the material, the smaller the contact area, the transmission of electricity will be affected. Therefore, after a period of use, the conductive ring 8 will be maintained by applying material on the surface of the conductive ring 8 to make the height of the conductive ring 8 the same as before, thereby improving the stability of the conduction.

[0062] Example 2

[0063] like Figure 8 and Fig. 9 As shown, this is a variation of a power drill pipe for underground power supply described in Example 1, specifically, the conductive ring 8 is made of copper, and the conductive ring 8 of the female connector 2 and the conductive ring 8 of the male connector 3 are respectively arranged on the cable end placement groove 7 through an elastic member 100, and the elastic member 100 is an insulating material; a through hole 101 is provided on the elastic member 100, and the power cable passes through the through hole 101 to connect with the conductive ring 8 for power supply. When the contact surface of the conductive ring 8 is a plane, the contact surface of the conductive ring 8 will be slightly higher than the second step 22 or the fourth step 32. When the main body is threadedly connected to another main body, pressure will be generated on the conductive ring 8. Under the action of pressure, the elastic member 100 will provide a supporting force for the conductive ring 8 in the opposite direction of the pressure, so that the conductive ring 8 located at the female connector 2 and the conductive ring 8 located at the male connector 3 are in closer contact and have better conductivity.

[0064] like Fig.10As shown, when the contact surface of the conductive ring 8 is a wedge-shaped inclined surface, the lower surface of the conductive ring 8 located at the male connector 3 of the body will be matched with the higher surface of the conductive ring 8 of the female connector 2 of the other body, and the higher surface of the conductive ring 8 of the male connector 3 of the body will be matched with the lower surface of the conductive ring 8 of the male connector 3 of the other body. Similarly, when the body is threadedly connected with another body, pressure will be generated on the conductive ring 8, and the elastic member 100 will provide a supporting force for the conductive ring 8 in the opposite direction of the pressure under the action of the pressure, so that the conductive ring 8 located at the female connector 2 and the conductive ring 8 located at the male connector 3 are in closer contact, and the conductive performance is better.

[0065] Example 3

[0066] like Fig.11 and Fig.12 As shown, this is a variation of the downhole power drill pipe described in Example 1, specifically, the conductive ring 8 is wedge-shaped, and a buffer groove is provided on the thicker side of the conductive ring 8. The thicker side of the conductive ring 8 of the main body male connector 3 will be squeezed by the thinner side of the conductive ring 8 of the other main body female connector 2. At the same time, the thicker side of the conductive ring 8 of the other main body female connector 2 will be squeezed by the thicker side of the conductive ring 8 of the main body male connector 3. After squeezing, the contact surfaces of the conductive ring 8 of the female connector 2 and the conductive ring 8 of the male connector 3 are approximately flat, making the contact of the conductive ring 8 more firm and close, and the conductive stability is higher. An elastic member 100 is provided in the buffer groove, so that after the main body is separated from the other body, the elastic member 100 is in an extended state, so that the conductive ring 8 above the buffer groove is reset. Fig.13 As shown, the power cable passes through the through hole 101 on the elastic member 100 and contacts the conductive ring 8 to conduct electricity.

[0067] Example 4

[0068] like Fig.14 As shown, this embodiment is a variation of the embodiment 1, specifically: the body 1 is cylindrical and hollow, and the cable trough 4 is opened on the outer wall of the body 1. Each of the cable troughs 4 is respectively provided with an arc-shaped guard plate 41, and each guard plate 41 is respectively connected to the body 1. Fig.15 As shown, when the diameter of the powered cable is small, a cable groove 4 is directly opened on the outer wall of the body 1, and the depth of the cable groove 4 is greater than or equal to the height of the powered cable, and the powered cable is completely buried in the cable groove 4, as shown in FIG. Fig.16As shown, the cable trough 4 includes a wire-releasing trough 42 and a groove 43. The groove 43 is located on the outer wall of the body 1. The wire-releasing trough 42 is located at the bottom of the groove 43. The guard plate 41 is adapted in the groove 43 in an arc shape, and the outer surface of the guard plate 41 is adapted to the outer surface of the body 1. Opening the cable trough 4 on the outer wall of the body 1 will not affect the strength of the body 1 and ensure the stability of operation. Because the diameter of the powered cable is small, the area of ​​the cable trough 4 is very small relative to the body 1 and can be ignored, so it will not affect the strength of the outer wall of the body 1. If the cable trough 4 is opened on the inner and outer walls of the body 1, the powered cable will contact objects unrelated to power transmission, making the placement environment of the powered cable complicated and affecting the stability of the powered cable. If the cable trough 4 is opened inside the outer wall of the body 1, the cable trough 4 will have an impact on the strength of both the inner and outer sides of the outer wall of the body 1, which will reduce the strength of the body 1 and affect the stability.

[0069] like Fig.17 and Fig.18 As shown, if the diameter of the powered cable is large, in order to ensure the strength of the outer wall of the body 1, the cable trough 4 cannot be opened too deep, so the depth of the cable trough 4 is less than the height of the powered cable, and then a cable limit groove adapted to the cable trough 4 is opened on the guard plate 41, and the powered cable is placed between the cable limit groove and the cable trough 4; since the depth of the cable trough 4 on the body 1 is small, it will not affect the strength of the body 1 itself. The guard plate 41 is integrally formed, including a connecting part and a reinforcing part, the connecting part is located on both sides of the reinforcing part, the outermost side of the reinforcing part is in an arc shape, and the connecting part is connected to the body 1. And the outermost diameter of the guard plate 41 is smaller than the outermost diameter of the female connector 2 or the male connector 3, and the channel drilled by the drill bit can meet the passage of the female connector 2 or the male connector 3, so that even if the outer diameter of the guard plate 41 is larger than the outer diameter of the body 1, it will not increase the resistance of drilling, and effectively protect the powered cable.

[0070] Example 5

[0071] like Fig.19 and Fig. 20 As shown, this embodiment is an optimization based on embodiment 1, and the difference is that a sheath 44 is arranged on the main body 1, and the sheath 44 is cylindrical and hollow. When the diameter or thickness of the powered cable is small, the cable trough 4 is opened on the outer wall of the main body 1, and the depth of the cable trough 4 is greater than or equal to the height of the powered cable. The powered cable is completely immersed in the cable trough 4, and then the inner wall of the sheath 44 is attached to the outer wall of the main body 1. Because the diameter or thickness of the powered cable is small, it will not affect the strength of the inner wall of the main body 1 itself. Adding the sheath 44 to the outer wall of the main body 1 will further improve the strength of the main body 1, and protect the powered cable, thereby improving the operational stability. Fig.21 and Fig. 22As shown, if the diameter or thickness of the powered cable is large, a cable groove 4 is opened on the outer wall of the main body 1 while ensuring the strength of the main body 1, and the depth of the cable groove 4 is less than the height of the powered cable. Since the depth of the cable groove 4 outside the main body 1 is small, it does not affect the strength of the main body 1 itself. The inner wall of the sheath 44 fits on the outer surface of the powered cable, which can confine the powered cable in the cable groove 4 and prevent the position of the cable groove 4 from changing and affecting the contact effect and even the conductive efficiency; the sheath 44 is connected to the main body 1 through reinforcing ribs, and the reinforcing ribs also increase the strength of the main body 1.

[0072] Example 6

[0073] like Fig.25 and Fig.26 As shown, this embodiment is a variation of embodiment 1. The difference between this embodiment and embodiment 1 is that the body 1 is integrally formed, including a convex portion 101 and a base portion 102, and the convex portion 101 is evenly distributed along the circumference of the base portion 102; the cable trough 4 is opened on the outer wall of the convex portion 101, which is convenient for technicians to inspect and repair the energized cables and also convenient for the placement of the energized cables. After the energized cables are placed in the cable channel and checked, the guard plate 41 is configured on the cable trough 4 to ensure that the energized cables can run stably. The cable trough 4 includes a cable trough 4 and a groove 43. The groove 43 is located on the outer wall of the body 1, the cable trough 4 is located at the bottom of the groove 43, and the guard plate 41 is adapted in the groove 43.

[0074] Example 7

[0075] like Fig.23 and Fig.24 As shown, this embodiment is a variation of embodiment 1. The difference between this embodiment and embodiment 6 is that the body 1 is integrally formed. A power drill pipe for underground power supply comprises a body 1, and a female connector 2 and a male connector 3 are respectively arranged at both ends of the body 1; three cable holes 6 are arranged circumferentially on the body 1, and connecting channels 5 adapted to the cable holes 6 are respectively opened on the female connector 2 and the male connector 3, and the cable holes 6 and the connecting channels 5 form a cable channel, and a powered cable is placed in each of the cable channels; a cable end placement groove 7 is respectively provided at the end of each of the connecting channels 5; a conductive ring 8 is respectively arranged in each of the cable end placement grooves 7 through an insulating ring 9, and the two ends of the powered cable are respectively connected to the conductive ring 8 for power supply; the body is integrally formed, and comprises a convex portion 101 and a base portion 102, and the convex portions 101 are evenly distributed circumferentially along the base portion 102;

[0076] The cable hole 6 is opened in the convex part, and an insulator is provided outside the power-carrying cable to insulate the power-carrying cable from the body 1 .

[0077] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A power drill pipe for underground power supply, characterized in that: It includes a main body, with a female connector and a male connector respectively disposed at two ends of the main body; a plurality of cable grooves are arranged on the main body along the circumferential direction; the female connector and the male connector are respectively provided with connection channels adapted to the cable grooves, and the cable grooves and the connection channels form a cable channel; a powered cable is placed in the cable channel; a cable end placement groove is arranged at the end of the connection channel; a conductive ring with an insulating ring is respectively arranged in each cable end placement groove, and the two ends of the powered cable are respectively connected to the conductive rings for power supply.

2. A power drill pipe for underground power supply according to claim 1, characterized in that: The outer diameters of the male connector and the female connector are larger than the outer diameter of the body; the female connector arranged on the body is threadedly connected to the male connector arranged on another body, or the male connector arranged on the body is threadedly connected to the female connector arranged on another body; the conductive ring on the female connector is matched with the conductive ring on the male connector and is in contact with electricity.

3. The underground power drill pipe for power supply according to claim 2, characterized in that: The contact surface between the conductive ring of the female connector and the conductive ring of the male connector is a plane.

4. The underground power drill pipe for power supply according to claim 2, characterized in that: The contact surface between the conductive ring of the female connector and the conductive ring of the male connector is a wedge-shaped inclined surface.

5. The underground power drill pipe for power supply according to claim 2, characterized in that: The conductive ring of the female connector and the conductive ring of the male connector are respectively arranged on the cable end placement groove through elastic members, and the elastic members are provided with through holes, and the powered cables pass through the through holes and are connected to the conductive rings for power supply.

6. The underground power drill pipe for power supply according to claim 2, characterized in that: The conductive ring is wedge-shaped, a buffer groove is provided on a side of the conductive ring with a larger thickness, and an elastic member is arranged in the buffer groove.

7. The underground power drill pipe for power supply according to claim 1, characterized in that: The cable troughs are evenly distributed along the circumference of the body, and each cable trough is slotted along the axial direction of the body.

8. The underground power drill pipe for power supply according to claim 1, characterized in that: The main body is cylindrical and hollow, and the cable trough is opened on the outer wall of the main body.

9. The underground power drill pipe for power supply according to claim 8, characterized in that: The cable troughs are respectively provided with arc-shaped guard plates, and each guard plate is respectively connected to the body.

10. The underground power drill pipe for power supply according to claim 9, characterized in that: The depth of the cable trough is greater than or equal to the height of the energized cable. The cable trough includes a wire laying trough and a groove. The groove is located on the outer wall of the body, the wire laying trough is located at the bottom of the groove, and the guard plate is adapted in the groove in an arc shape.

11. The underground power drill pipe for power supply according to claim 9, characterized in that: The depth of the cable trough is less than the height of the energized cable, and a cable limiting groove adapted to the cable trough is opened on the guard plate; the guard plate is integrally formed, including a connecting part and a reinforcing part, the connecting part is located on both sides of the reinforcing part, and the connecting part is connected to the main body.

12. The underground power drill pipe for power supply according to claim 8, characterized in that: The main body is provided with a sheath which is cylindrical and hollow.

13. The underground power drill pipe for power supply according to claim 12, characterized in that: The depth of the cable trough is greater than or equal to the height of the energized cable, and the inner wall of the sheath is in contact with the outer wall of the body.

14. The underground power drill pipe for power supply according to claim 12, characterized in that: The depth of the cable trough is less than the height of the energized cable, the inner wall of the sheath is fitted on the outer surface of the energized cable, and the sheath is connected to the body through reinforcing ribs.

15. The underground power drill pipe for power supply according to claim 1, characterized in that: The body is integrally formed and comprises a convex portion and a base portion, wherein the convex portions are evenly distributed along the circumference of the base portion; and the cable grooves are opened on the convex portions one by one.

16. A downhole power drill pipe for power supply according to claim 15, characterized in that: The cable trough is opened on the outer wall of the convex part, and comprises a wire laying trough and a groove. The groove is located on the outer wall of the main body, the wire laying trough is located at the bottom of the groove, and the guard plate is adapted in the groove.

17. The underground power drill pipe for power supply according to claim 1, characterized in that: The female connector has a cavity with an internal thread; the outer side of the cavity is stepped, including a first step and a second step, the first step is adjacent to the cavity, and the second step is located outside the first step; the cable end placement groove on the female connector is located on the first step.

18. The underground power drill pipe for power supply according to claim 1, characterized in that: The male connector has a convex body with an external thread; the outer side of the convex body is stepped, including a third step and a fourth step, the third step is adjacent to the convex body, and the fourth step is located outside the third step; the cable end placement groove on the male connector is located on the third step.

19. A power drill pipe for underground power supply, characterized in that: The utility model comprises a main body, wherein two ends of the main body are respectively provided with a female connector and a male connector; a plurality of cable holes are arranged on the main body along the circumferential direction, and the female connector and the male connector are respectively provided with connection channels adapted to the cable holes, and the cable holes and the connection channels form a cable channel, and a powered cable is respectively placed in each of the cable channels; a cable end placement groove is respectively provided at the end of each of the connection channels; a conductive ring is respectively arranged in each of the cable end placement grooves through an insulating ring, and the two ends of the powered cable are respectively connected to the conductive ring for power supply; The body is integrally formed and comprises a convex portion and a base portion, wherein the convex portion is evenly distributed along the circumference of the base portion; and the cable hole is opened in the convex portion.

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