CN216922041U

CN216922041U - Drill rod for directional branch drilling

Info

Publication number: CN216922041U
Application number: CN202220725050.6U
Authority: CN
Inventors: 彭腊梅; 吕伟伟; 余飞; 白进辉; 陈斌; 张坚; 陈晨
Original assignee: Shaanxi Taihe Intelligent Drilling Co ltd
Current assignee: Shaanxi Taihe Intelligent Drilling Co ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2022-07-08
Anticipated expiration: 2032-03-31

Abstract

The utility model discloses a drill rod for directional branch drilling, which relates to the field of directional drilling and comprises a drill rod body, wherein the drill rod body comprises a pipe body and a cable, a male joint is arranged at one end of the pipe body, a female joint is arranged at the other end of the pipe body, internal threads are arranged on the inner peripheral wall of the female joint, external threads are arranged on the outer peripheral wall of the male joint, a butt joint table is arranged at the joint of the external threads of the male joint and the pipe body, reinforcing bulges are arranged on the periphery of the butt joint table, and a locking clamping assembly is arranged between the male joint and the female joint and comprises an embedded groove. It is protruding in setting up the enhancement, can further strengthen the intensity of butt joint platform and male joint external screw thread and body junction, strengthens protruding wearing and tearing at first of can carrying out, avoids the butt joint platform wearing and tearing excessive, and it sets up locking chucking subassembly, can be at drilling vibrations and rotatory fixed stable that maintains male joint and female joint, reduces the screw thread wearing and tearing, reduces the probability of fracture or deformation of male and female joint department, extension drilling rod life.

Description

Drill rod for directional branch drilling

Technical Field

The utility model relates to the field of directional drilling, in particular to the technical field of drill rods.

Background

In the 30's of the 20 th century, directional drilling was first used for oil drilling. The early 50 s began to be used for geological drilling. With the successful development of a novel continuous whipstock and a small-caliber screw drill (motor), the application of a diamond drill bit and a drilling inclinometer makes the development of controlled directional drilling become one of modern advanced drilling technologies.

The controlled directional drilling technology can provide accurate geological data, save drilling site field and drilling workload, and accelerate geological exploration, thereby being widely popularized and applied. With the development of the state of technology, the introduction of microcomputer and navigation technologies; small-bore hole bottom power machines (screw drills), measurement while drilling systems and the like have reached practical levels; the complete set of surface equipment has reached the high level of omnibearing 'controlled' directional drilling, especially the windrow of lateral horizontal drilling in the world, and the directional drilling technology enters an advanced stage.

The main functions of the directional drilling rod are that the directional drilling rod is an important component of directional drilling equipment, is a part with complex stress and bad working conditions in the directional drilling process, and has the main functions of 1) transmitting the axial pressure applied to a drill bit by a drilling machine during drilling and bearing the reaction torque of a hole bottom motor; 2) the push-pull force applied to the drilling tool by the drilling machine is transferred when the drilling tool is pulled down; 3) as a medium channel, the flushing liquid is conveyed to the bottom of the hole.

Directional drilling is a drilling method which utilizes the natural bending law of the drill hole or adopts a man-made whipstock to make the drill hole extend to a preset target according to the design requirement. It can also be interpreted as the process and science of deflecting the borehole in a particular direction in order to drill to a predetermined subsurface target. The directional drilling technology is one of the front-end drilling methods in the world at present, and the directional drilling technology is provided with a GDS guiding system which can drill to a specified position according to a pre-designed drilling track through monitoring of an off-hole computer. The method has incomparable advantages for gas drainage, coal gas layer development, emergency rescue, detection and discharge of accumulated water in a goaf, geological structure and the like. The cable-passing drill rod and the directional drilling machine are matched and applied in drilling engineering and widely used for borehole deviation correction, namely, a rock core is taken, accident hole invar or a complex hole section is discussed, and ground obstacles are avoided; exploring steep ore body, coal bed drainage or gas exploitation, checking hydrogeology and engineering geology in specific position area of vertical shaft of mine, and starting and controlling laying underground pipeline. However, in the case of coal mines, the application in the field of prevention and development is also multifaceted, such as the drainage of regional local coal seams.

The cable-through type drill rod is a signal transmission device between a hole bottom inclination measuring unit and an orifice inclination measuring device, is an important matched drilling tool for ensuring smooth implementation of directional drilling, is mainly applied to dry coal mine and downward directional drilling, coal mine and downward rotary drilling and other geological controlled directional drilling working conditions, and the signal transmission mode of the conventional drill measuring system is divided into a wired mode (an electrical system) and a wireless mode. The cable-through drill rod can directly supply power to the hole bottom sensor as a wired (cable) transmission mode, and bidirectional communication between the bottom guide device and the orifice device is realized. The real-time good data transmission is high, and the cable-through type drilling rod solves the installation problem of the connection between the traditional product electric system and the drilling rod and the connection between the electric systems, and can ensure the transmission of signals of the measurement system of the driller on the wire (electric system).

In order to save investment, directional drilling equipment used by construction contractors is often not matched with actual requirements in construction, the tonnage of the directional drilling equipment is too small, maintenance is not timely, the fault rate is high, the drilling force of the directional drilling equipment is not uniform, meanwhile, construction stop and go causes poor hole forming quality and irregular holes, a drilling tool is easy to lock, meanwhile, the stress and the torsion of a drill rod are often easily concentrated on a male joint and a female joint, a dangerous area which is easy to break is formed at the joint thread, the pipe wall at the joint thread is thin, and meanwhile, high-strength vibration and rotation are caused, the drill rod is often broken or deformed at the male joint and the female joint after long-time high-strength use, and the threads of the male joint and the female joint are also often worn excessively.

SUMMERY OF THE UTILITY MODEL

The utility model aims to: in order to solve the technical problem, the utility model provides a drill rod for directional branch drilling.

The utility model specifically adopts the following technical scheme for realizing the purpose:

a drill rod for directional branch drilling comprises drill rod bodies connected with each other, wherein each drill rod body comprises a pipe body and a cable arranged in the pipe body, a male joint is arranged at one end of the pipe body, a female joint is arranged at the other end of the pipe body, the male joint and the female joint are connected with the pipe body through friction welding, inner peripheral walls of the female joint are provided with internal threads, external threads are arranged on the peripheral wall of the male joint, a butt joint platform is arranged at the joint of the male joint external threads and the pipe body, the end part of the female joint is abutted against the butt joint platform, reinforcing bulges with trapezoidal cross sections are encircled on the peripheral walls of the butt joint platform, a locking clamping assembly is arranged between the male joint and the female joint and comprises an embedded groove arranged at the end part of the male joint external threads, a support rod is arranged in the embedded groove, and locking bulges are arranged at the end part of the support rod, the female joint is internally provided with an embedded groove corresponding to the anti-loosening protrusion, the diameter of the internal thread is gradually reduced from the inside of the female joint to the end part, and the diameter of the external thread is gradually reduced from the external thread to the pipe end connecting end part.

By the scheme, the reinforcing bulges with trapezoidal cross sections are surrounded on the periphery of the butt joint platform, the strength of the butt joint platform and the joint of the male joint external thread and the pipe body can be further enhanced, the reinforcing bulges can be firstly worn to avoid excessive wear of the butt joint platform, meanwhile, the convex reinforcing bulges can clean sundries in a drill hole to avoid sundries from wearing the joint, the anti-loosening clamping assembly is arranged, when the anti-loosening clamping assembly is installed, the internal thread and the external thread are embedded and fixed, meanwhile, the diameter of the internal thread is gradually reduced from the inside of the female joint to the end part, the diameter of the external thread is gradually reduced from the part close to the pipe end connecting end part of the external thread, the anti-loosening bulges can conveniently pass through, meanwhile, when the male joint is connected with the female joint, the anti-loosening bulges are firstly abutted against the inside of the female joint to enable the support rod to be bent and embedded into the embedded groove, and then, under the reset action of the support rod, the anti-loosening bulges are embedded into the embedded groove, accomplish the preliminary locking of male joint and female joint, can be at drilling vibrations and rotatory the fixed stability that maintains male joint and female joint, reduce threaded wear, when dismantling, rotatory male and female joint makes locking arch break away from the embedded groove, accomplishes the device split to reduce the probability of male and female joint department fracture or deformation, also avoid male and female joint threaded wear excessive, extension drilling rod life.

Further, the diameters of the male connector and the female connector are less than 5mm of the pipe body.

Through the scheme, the diameter of the male connector and the diameter of the female connector are smaller than that of the pipe body, impurities can be preferentially rubbed with the pipe body with high strength in the drilling process, and therefore friction loss of the male connector and the female connector is reduced.

Furthermore, the joint of the pipe body and the male joint is provided with a reinforced friction pad which protrudes outwards and is distributed in an annular shape, the joint of the pipe body and the female joint is also provided with a reinforced friction pad, and the reinforced friction pad is in a gentle slope shape with a high middle part and low two ends.

Through above-mentioned scheme, set up and strengthen the friction pad, can strengthen the thickness of junction on the one hand, promote structural strength, the fungible junction carries out the friction loss on the one hand to extension fixture life, strengthen the friction pad and be the gentle slope form that the middle height both ends are low and be convenient for through debris, be convenient for debris along drilling discharge, reduce the sticking of a drill locking.

Furthermore, arc-shaped feeding edges are distributed on the reinforced friction pad, and feeding edges are also distributed on the periphery of the reinforced bulge.

Through above-mentioned scheme, set up the feeding arris and be convenient for debris along the drilling discharge, reduce the sticking of tool locking.

Furthermore, the periphery of the pipe body is provided with a triangular spiral.

Through the scheme, the triangular spiral is convenient for sundries to be discharged along the drilled hole, and the blocking of the drill is reduced.

Further, the anti-loosening bulge is any one of a sphere, a cake shape, a cylinder and a spindle shape.

Through the scheme, the anti-loosening bulge is any one of a sphere, a cake shape, a cylinder and a spindle shape, so that the anti-loosening bulge can be conveniently embedded into and separated from the embedded groove.

Furthermore, the anti-loosening bulge is screwed and fixed with the support rod through threads, and the anti-loosening bulge is provided with a dismounting hole.

Through the scheme, the anti-loosening protrusion is fixedly connected with the supporting rod through the threads in a screwed mode, the dismounting hole is formed, the anti-loosening protrusion is convenient to dismount and replace, and maintenance and replacement are convenient.

Furthermore, the locking protrusion and the tabling groove are provided with 2 groups in a matching way, and the two groups are symmetrically distributed on the male joint and the female joint.

Through above-mentioned scheme, the symmetric distribution, it fastens locking effectual.

Further, the periphery of the pipe body is provided with a discharging spiral, and the pitch of the discharging spiral is not less than 0.8 cm.

Further, the thread taper of the discharging spiral is 1: 30.

The utility model has the following beneficial effects:

1. the utility model has simple structure, the reinforcing bulges with trapezoidal cross sections are surrounded on the periphery of the butt joint platform, the strength of the butt joint platform and the joint of the male joint external thread and the pipe body can be further reinforced, the reinforcing bulges can be firstly worn to avoid excessive wear of the butt joint platform, meanwhile, the convex reinforcing bulges can clean up sundries in a drill hole to avoid sundries from wearing the joint, the anti-loosening clamping assembly is arranged, when the anti-loosening clamping assembly is installed, the internal thread and the external thread are embedded and fixed, the diameter of the internal thread is gradually reduced from the inside of the female joint to the end part, the diameter of the external thread is gradually reduced from the external thread to the pipe end connecting end part, the anti-loosening bulges can conveniently pass through, when the male joint is connected with the female joint, the anti-loosening bulges are firstly abutted against the inside of the female joint to promote the support rod to bend, the anti-loosening bulges to be embedded into the embedded groove, and then under the action of the reset of the support rod, the anti-loosening bulges are embedded into the embedded groove, the primary locking of the male joint and the female joint is completed, the male joint and the female joint can be kept fixed and stable during drilling vibration and rotation, thread abrasion is reduced, when the drill rod is disassembled, the male joint and the female joint are rotated, the anti-loosening protrusions are enabled to be separated from the embedded grooves, and the disassembly of the device is completed, so that the probability of fracture or deformation of the male joint and the female joint is reduced, excessive thread abrasion of the male joint and the female joint is avoided, and the service life of the drill rod is prolonged;

2. the reinforced friction pad is arranged, so that the thickness of the joint can be reinforced, the structural strength is improved, the friction loss can be performed on the joint instead of the joint, the service life of the device is prolonged, the reinforced friction pad is in a gentle slope shape with a high middle and low ends, so that sundries can be conveniently passed through, the sundries can be conveniently discharged along a drill hole, and the drill jamming and locking are reduced;

3. locking arch with the bracing piece connects fixedly soon through the screw to set up the dismantlement hole, conveniently dismantle and change locking arch, convenient maintenance and change.

Drawings

FIG. 1 is a schematic structural view of the present application, wherein the female joint section is shown in cross-section;

FIG. 2 is an enlarged view of part A of FIG. 1;

figure 3 is a cross-sectional view of the tubular body of the present application.

Reference numerals: 11. a pipe body; 12. a cable; 13. a male connector; 14. a female joint; 15. an internal thread; 16. an external thread; 17. a docking station; 18. a reinforcing protrusion; 19. a groove is embedded; 20. a support bar; 21. anti-loosening bulges are arranged; 22. a fitting groove; 23. disassembling the hole; 24. reinforcing a friction pad; 25. a feeding edge; 26. discharging spirally; 27. a triangular spiral.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and are not limiting on the number of their objects.

Directional drilling is a drilling method which utilizes the natural bending law of the drill hole or adopts a man-made whipstock to make the drill hole extend to a preset target according to the design requirement. It can also be interpreted as the process and science of deflecting the borehole in a particular direction in order to drill to a predetermined subsurface target. The directional drilling technology is one of the front-end drilling methods in the world at present, and the directional drilling technology is provided with a GDS guiding system which can drill to a specified position according to a pre-designed drilling track through monitoring of an off-hole computer. The method has incomparable advantages for gas drainage, coal gas layer development, emergency rescue, detection and discharge of accumulated water in the goaf, geological structure and the like. The cable-passing drill rod and the directional drilling machine are matched and applied in drilling engineering and widely used for borehole deviation correction, namely, a rock core is taken, accident hole invar or a complex hole section is discussed, and ground obstacles are avoided; exploring steep ore body, coal bed drainage or gas exploitation, checking hydrogeology and engineering geology in specific position area of vertical shaft of mine, and starting and controlling laying underground pipeline. However, in the case of coal mines, the application in the field of prevention and development is also multifaceted, such as the drainage of regional local coal seams. In order to solve the problems that in the prior art, a drilling tool is easy to lock, meanwhile, the stress and the torsion of a drill rod are often easily concentrated on a male joint and a female joint, the joint thread is easy to break, the pipe wall of the joint thread is thin, meanwhile, the vibration and the rotation are high in strength, the drill rod is often broken or deformed at the male joint and the female joint due to long-time high-strength use, and the wear of the threads of the male joint and the female joint is excessive, the drill rod for directional branch drilling is disclosed.

Example 1

Referring to fig. 1 and 2, the present embodiment provides a drill rod for directional branch drilling, which includes a drill rod body connected to each other, the drill rod body includes a pipe body 11 and a cable 12 disposed in the pipe body 11, a male joint 13 is disposed at one end of the pipe body 11, a female joint 14 is disposed at the other end of the pipe body 11, the male joint 13 and the female joint 14 are connected to the pipe body 11 by friction welding, an internal thread 15 is disposed on an inner peripheral wall of the female joint 14, an external thread 16 is disposed on an outer peripheral wall of the male joint 13, a butt-joint table 17 is disposed at a connection position of the external thread 16 of the male joint 13 and the pipe body 11, an end of the female joint 14 abuts against the butt-joint table 17, a reinforcing protrusion 18 having a trapezoidal cross section is surrounded on an outer periphery of the butt-joint table 17, an anti-loosening clamping assembly is disposed between the male joint 13 and the female joint 14, the anti-loosening clamping assembly includes an embedded groove 19 disposed at an end of the external thread 16 of the male joint 13, a support rod 20 is disposed in the embedded groove 19, the end of the support rod 20 is provided with a locking protrusion 21, the female joint 14 is provided with a tabling groove 22 corresponding to the locking protrusion 21, the diameter of the internal thread 15 is gradually reduced from the inside of the female joint 14 to the end, and the diameter of the external thread 16 is gradually reduced from the external thread 16 close to the pipe end connecting end.

Therefore, the reinforcing bulge 18 with the trapezoidal section is surrounded on the periphery of the butt joint platform 17, the strength of the joint of the butt joint platform 17 and the external thread 16 of the male joint 13 and the pipe body 11 can be further enhanced, the reinforcing bulge 18 can be firstly worn to avoid excessive wear of the butt joint platform 17, meanwhile, the convex reinforcing bulge 18 can clean up sundries in a drill hole to avoid sundry wear joint, the anti-loosening clamping component is arranged, when the butt joint platform is installed, the internal thread 15 is embedded and fixed with the external thread 16, the diameter of the internal thread 15 is gradually reduced from the inside of the female joint 14 to the end part, the diameter of the external thread 16 is gradually reduced from the near pipe end connecting end part of the external thread 16 to facilitate the passing of the anti-loosening bulge 21, when the male joint 13 is connected with the female joint 14, the anti-loosening bulge 21 is firstly abutted against the inside of the female joint 14 to enable the bending anti-loosening bulge 21 of the support rod 20 to be embedded into the embedded groove 19, and then under the action of resetting of the support rod 20, locking arch 21 embedding embedded groove 19 is in, accomplish the preliminary locking of male joint 13 and female joint 14, can be at the drilling vibrations and rotatory fixed stable that maintains male joint 13 and female joint 14, reduce the screw thread wearing and tearing, when dismantling, rotatory male and female joint 14 makes locking arch 21 break away from embedded groove 19, accomplishes the device split to reduce the probability of male and female joint 14 department fracture or deformation, also avoid male and female joint 14 screw thread wearing and tearing excessively, extension drilling rod life.

Referring to fig. 1 and 2, in order to reduce the influence of vibration and rotation of the pipe body 11 on the male connector 13 and the female connector 14, the anti-loose protrusion 21 is any one of spherical, pie-shaped, cylindrical and spindle-shaped, the anti-loose protrusion 21 is screwed and fixed with the support rod 20 through threads, the anti-loose protrusion 21 is provided with a dismounting hole 23, the anti-loose protrusion 21 is screwed and fixed with the support rod 20 through threads, and the dismounting hole 23 is arranged, so that the anti-loose protrusion 21 is conveniently dismounted and replaced, and the maintenance and the replacement are convenient. The anti-loosening protrusions 21 and the embedding grooves 22 are provided with 2 groups in a matched mode, are symmetrically distributed on the male connector 13 and the female connector 14, and are good in fastening and anti-loosening effects.

Referring to fig. 1 and 2, to reduce wear on the male and

female connectors

13 and 14 and the connection with the pipe body 11, the male and

female connectors

13 and 14 are smaller in diameter than the pipe body 115 mm. The male and

female connectors

13 and 14 have a smaller diameter than the pipe body 11, and impurities are preferentially rubbed with the high-strength pipe body 11 during drilling, thereby reducing frictional loss of the male and

female connectors

13 and 14. The pipe body 11 is provided with a reinforced friction pad 24 which is convexly distributed in an annular shape at the joint with the male joint 13, the pipe body 11 is also provided with a reinforced friction pad 24 at the joint with the female joint 14, the reinforced friction pad 24 is in a slope shape with a high middle part and low two ends, an arc-shaped feeding edge 25 is distributed on the reinforced friction pad 24, and a feeding edge 25 is also distributed on the periphery of the reinforced bulge 18. Set up and strengthen friction pad 24, can strengthen the thickness of junction on the one hand, promote structural strength, the fungible junction carries out the friction loss on the one hand to extension fixture life, strengthen friction pad 24 and be the gentle slope form that high both ends are low in the middle of being convenient for through debris, be convenient for debris along drilling discharge, reduce the sticking of drill locking, set up feeding arris 25 and be convenient for debris along drilling discharge, reduce the sticking of drill locking. Meanwhile, the periphery of the pipe body 11 is provided with the triangular spiral 27, and the triangular spiral 27 is convenient for sundries to be discharged along the drilled hole, so that the blocking of the drill is reduced.

Example 2

The structure of the embodiment 2 is basically the same as that of the embodiment 1, and referring to fig. 3, the difference is that a discharging screw 26 is arranged on the periphery of the pipe body 11, the pitch of the discharging screw 26 is not less than 0.8cm, and the thread taper of the discharging screw 26 is 1: 30.

The implementation principle is as follows: the reinforcing bulge 18 with a trapezoidal section is surrounded on the periphery of the butt joint platform 17, the strength of the joint of the butt joint platform 17 and the external thread 16 of the male joint 13 and the pipe body 11 can be further enhanced, the reinforcing bulge 18 can be firstly worn to avoid excessive wear of the butt joint platform 17, meanwhile, the convex reinforcing bulge 18 can clean up sundries in a drill hole to avoid sundry wear joint, the reinforcing bulge is provided with a locking clamping component, when the butt joint platform is installed, the internal thread 15 is embedded and fixed with the external thread 16, the diameter of the internal thread 15 is gradually reduced from the inside of the female joint 14 to the end part, the diameter of the external thread 16 is gradually reduced from the pipe end connecting end part close to the external thread 16, so that the locking bulge 21 can conveniently pass through, when the male joint 13 is connected with the female joint 14, the locking bulge 21 is firstly abutted against the inside of the female joint 14 to enable the bending locking bulge 21 of the support rod 20 to be embedded into the embedded groove 19, and then under the action of resetting of the support rod 20, locking arch 21 embedding embedded groove 19 is in, accomplish the preliminary locking of male joint 13 and female joint 14, can be at the drilling vibrations and rotatory fixed stable that maintains male joint 13 and female joint 14, reduce the screw thread wearing and tearing, when dismantling, rotatory male and female joint 14 makes locking arch 21 break away from embedded groove 19, accomplishes the device split to reduce the probability of male and female joint 14 department fracture or deformation, also avoid male and female joint 14 screw thread wearing and tearing excessively, extension drilling rod life.

Claims

1. A drill rod for directional branch drilling comprises drill rod bodies connected with each other, wherein each drill rod body comprises a pipe body (11) and a cable (12) arranged in the pipe body (11), a male joint (13) is arranged at one end of the pipe body (11), a female joint (14) is arranged at the other end of the pipe body (11), the drill rod is characterized in that the male joint (13) and the female joint (14) are connected with the pipe body (11) through friction welding, internal threads (15) are arranged on the inner peripheral wall of the female joint (14), external threads (16) are arranged on the outer peripheral wall of the male joint (13), a butt joint table (17) is arranged at the joint of the external threads (16) of the male joint (13) and the pipe body (11), the end of the female joint (14) is abutted to the butt joint table (17), reinforcing bulges (18) with trapezoidal cross sections are encircled on the outer periphery of the butt joint table (17), and a locking assembly is arranged between the male joint (13) and the female joint (14), locking chucking subassembly is including locating embedded groove (19) of external screw thread (16) tip on male joint (13), be equipped with bracing piece (20) in embedded groove (19), bracing piece (20) tip is equipped with locking arch (21), be equipped with in female joint (14) with gomphosis groove (22) that locking arch (21) correspond, internal thread (15) certainly female joint (14) are inside to the tip diameter reduces gradually, external screw thread (16) reduce gradually from the nearly tubular product end connection tip diameter of external screw thread (16).

2. Drill rod for directional branch drilling according to claim 1, characterized in that the male (13) and female (14) joints are less than 5mm in diameter than the tubular body (11).

3. The drill rod for directional branch drilling according to claim 2, characterized in that the pipe body (11) is provided with a convex annular reinforced friction pad (24) at the joint with the male joint (13), the pipe body (11) is also provided with a reinforced friction pad (24) at the joint with the female joint (14), and the reinforced friction pad (24) is in a gentle slope shape with a high middle part and low two ends.

4. The drill rod for directional branch drilling according to claim 3, characterized in that the friction-enhancing pads (24) are distributed with arc-shaped feeding ribs (25), and the reinforcing protrusions (18) are also distributed with feeding ribs (25) on the periphery.

5. A drill rod for directional branch drilling according to claim 1, characterized in that the tube body (11) is provided with a triangular spiral (27) at its periphery.

6. A drill rod for directional branch drilling according to claim 1, characterized in that the anti-loosening projections (21) are any one of spherical, pie-shaped, cylindrical, spindle-shaped.

7. The drill rod for directional branch drilling according to claim 1, characterized in that the anti-loose bulge (21) is screwed and fixed with the support rod (20), and the anti-loose bulge (21) is provided with a dismounting hole (23).

8. A drill rod for directional branch drilling according to claim 1, characterized in that the anti-loosening projections (21) and the fitting grooves (22) are provided in 2 sets in a matching manner, symmetrically distributed on the male joint (13) and the female joint (14).

9. A drill rod for directional branch drilling according to claim 3, characterized in that the outer circumference of the pipe body (11) is provided with a discharging screw (26), and the pitch of the discharging screw (26) is not less than 0.8 cm.

10. Drill rod for directional branch drilling according to claim 9, characterized in that the thread taper of the tapping screw (26) is 1: 30.