Directional drilling equipment

Abstract

The invention relates to a directional drilling tool, which is composed of an instrument delivery device and a directional drilling hydraulic tool, wherein: the instrument delivery device comprises a ball short circuit with one end connected to a measuring instrument or a core fishing tool and the other end connected to an instrument probe with a wire rope; the directional drilling hydraulic tool comprises a high-pressure water delivery tool, the high-pressure water delivery tool comprises a high-pressure water pipe, a fixed pipe, an inlet pipe and a hollow short circuit body, the hollow short circuit body is used to connect a drill rod, a rubber plug and a plurality of sealing elements are arranged in the inlet pipe, and pore channels are respectively opened on the plurality of sealing elements and the rubber plug; when directional drilling is performed, the ball short circuit is arranged inside the drill rod, the wire rope on the instrument probe is arranged in the pore channel, and the instrument delivery device can be efficiently delivered from the ground to a designated position at the bottom of a hole by using high-pressure water, and the instrument and the core can be fished back to the ground from the bottom of the hole.

Description

Technical Field

[0001] The invention relates to the field of directional drilling, and in particular to an instrument delivery device, a directional drilling hydraulic tool and a directional drilling equipment, which are particularly suitable for directional horizontal delivery of measuring instruments or core fishing tools in soft soil layers. Background Art

[0002] In the field of geological drilling, directional drilling mainly uses non-coring water flow to impact the bottom hole motor to rotate at high speed to drive the drill bit and drilling tools. The measurement while drilling instrument mainly uses a wireless drilling instrument. The wireless drilling instrument is installed in the drilling tool before drilling, and it is lowered to the bottom of the hole to carry out work when drilling. Among them, due to the structural reasons of the wireless drilling instrument and the drilling tool, this drilling tool cannot carry out directional coring drilling, but can only carry out directional coreless drilling. Moreover, the wireless drilling instrument for measurement while drilling must rely on a large water pump with a large flow rate (more than 1000L / n) and high water pressure (more than 10MPa) to work well. This large flow rate and high water pressure is fine when the rock at the bottom of the hole is relatively complete and hard, but it is very easy to crush the hole wall in a weak formation and cause a buried drilling accident. Moreover, the larger the flow rate and the higher the pressure, the larger the volume and the heavier the weight of the water pump, which brings many inconveniences to transportation under field conditions.

[0003] At present, there are also "wired downhole instruments" with relatively small flow and pump pressure, but the instrument must be connected to a thin steel wire cable from the bottom of the hole to the ground. When the inclinometer with a thin steel wire cable is placed from the ground to the bottom of the hole perpendicular to the ground, it mainly relies on gravity and water pressure. When the directional drilling reaches a long horizontal section, the instrument often cannot be delivered to the position, so the directional drilling cannot be carried out normally.

[0004] Therefore, how to successfully deliver the wired downhole instrument from the ground to the designated position at the bottom of the hole to carry out work in soft formations and long-distance horizontal coreless drilling; and how to solve the problem of delivering such instruments with steel cables or tools for salvaging cores with steel wire ropes from the ground to the designated position at the bottom of the hole and salvaging the instruments and cores from the bottom of the hole back to the ground for the newly emerged precision directional rope coring drilling in China, are urgent problems that need to be solved in the field of geological drilling, both coreless drilling and directional coring drilling. Summary of the invention

[0005] Based on the problems that wireless station instruments are difficult to deliver in a directional manner when conducting directional coreless drilling or horizontal drilling in soft soil strata, and that wired station instruments cannot be transported horizontally over long distances when conducting directional coring drilling, the present invention provides an instrument delivery device and a directional drilling hydraulic tool which are matched with the instrument delivery device, which are provided by arranging a ball short-circuit for assembling a coring tool or a measuring instrument in a drilling drill pipe, and utilizing high-pressure water to horizontally transport the ball short-circuit over long distances to deliver the instrument from the ground drill pipe to a designated position at the bottom of the hole and recover it to the ground.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: an instrument delivery device, including a ball short circuit, one end of the ball short circuit is threadedly connected to a measuring instrument or a core fishing tool, and the other end is threadedly connected to an instrument probe with a wire rope;

[0007] The ball short circuit includes a short circuit body and a bearing assembly; three installation grooves are circumferentially opened on the short circuit body; the bearing assembly includes a bearing seat, a ball bearing, a bearing washer and a small shaft, the bearing seat is opened with a bearing installation groove, the ball bearing is arranged in the bearing installation groove, the bearing washer is respectively arranged at both ends of the ball bearing, the small shaft is transversely arranged in the ball bearing and the two bearing washers, and the bearing seat is installed and fixed to the short circuit body by fastening screws arranged at both ends.

[0008] Furthermore, the short-circuit body includes a first connecting section and a second connecting section, the first connecting section is provided with an external thread for connecting to the measuring instrument or the core salvage tool, the second connecting section is a cylinder, one end of the cylinder is provided with an internal thread matching the instrument probe, the three mounting grooves are arranged on the cylinder in a manner of equally dividing the circumference, and the outer diameter of the cylinder matches the inner diameter of the drill pipe for directional drilling.

[0009] The present invention also provides a directional drilling hydraulic tool for conveying the above-mentioned instrument delivery device, comprising a high-pressure water delivery tool, the high-pressure water delivery tool comprising a hollow fixed pipe, the fixed pipe body is provided with a high-pressure water pipe intersecting the fixed pipe, and the high-pressure water pipe is connected to a high-pressure water pump;

[0010] Wherein: one end of the fixed pipe is threadedly connected to the hollow inlet pipe, the end of the inlet pipe is provided with a rubber plug, a plurality of sealing elements are closely arranged inside the inlet pipe, one end of the plurality of sealing elements is in contact with the rubber plug, and the other end is in contact with the end of the fixed pipe; the plurality of sealing elements and the rubber plug are respectively provided with aperture channels for the steel wire rope provided on the instrument delivery device to pass through;

[0011] The other end of the fixed pipe is connected to a flexible pipe through an external thread, the flexible pipe is connected to a hollow short-circuit body through an internal thread, and the hollow short-circuit body is threadedly connected to the drill rod.

[0012] Further, the plurality of sealing elements include a first rubber pad, an open gasket, and a plurality of second rubber pads arranged between the first rubber pad and the open gasket, the first rubber pad is arranged in contact with the rubber plug, the bottom of the second rubber pad is provided with an annular groove structure identical to the bottom structure of the first rubber pad; the tops of the plurality of second rubber pads are provided with a conical structure matching the annular groove structure at the bottom of the first rubber pad, the first rubber pad and the second rubber pad, and the plurality of second rubber pads are closely arranged by means of the cooperation of the conical structure and the annular groove structure, and the open gasket is provided between the end of the fixed pipe and the inlet pipe.

[0013] Furthermore, the second rubber pad is in the shape of a combined truncated cone in terms of external structure, a truncated cone groove is arranged inside the upper truncated cone structure, and the cross section of the lower truncated cone is M-shaped.

[0014] Furthermore, the middle positions of the rubber plug, the first rubber pad and the plurality of second rubber pads are respectively provided with central through holes for the wire rope to pass through, and one side of the rubber plug, the first rubber pad and the plurality of second rubber pads are respectively provided with longitudinal incisions connected to the central through holes.

[0015] Preferably, the plurality of second rubber pads are assembled and fixed in a staggered installation manner.

[0016] Preferably, the high-pressure water pipe is welded to a fixed pipe, and a sealing coating is provided at a welding point between the fixed pipe and the high-pressure water pipe.

[0017] Preferably, a sealing gasket connected to the flexible pipe is provided between the hollow short-circuit body and the fixed pipe.

[0018] The present invention also provides a directional drilling device, which is composed of the above-mentioned instrument delivery device and a directional drilling hydraulic tool. When performing directional drilling, the instrument delivery device is placed inside the drill pipe through an inlet pipe, and the wire rope is arranged in the pore channel of the rubber plug and multiple sealing elements.

[0019] Among them, during the implementation of precise directional core drilling, the top angle and azimuth of the borehole will continue to change due to uneven hardness of the rock formation or changes in the rock formation and various objective conditions. This requires that the tool face angle and azimuth be adjusted continuously according to the measurement data during the drilling process in order to achieve the drilling design goal. If wireless measuring instruments are used to measure parameters such as the top angle and azimuth, the instrument must be retrieved from the drill pipe hole to the ground, and the data in the borehole can only be obtained after the data is downloaded (because the channel for salvaging the core must be kept unobstructed and the instrument cannot be left in the hole). If the tool face angle and azimuth in the hole are adjusted, real-time data cannot be displayed (because the instrument has been salvaged to the ground). In addition, as the borehole becomes longer, the twisting rate of the drill pipe increases, and the false values ​​of the ground adjustment parameters will increase. Therefore, large errors will occur, and the purpose of precise directional core drilling cannot be achieved. When a wired drilling instrument is used, because a thin steel cable is connected from the instrument at the bottom of the hole to the receiver on the ground, the technical parameters of the borehole can be understood in real time, and accurate field parameters can be displayed in time when the required drilling parameters are adjusted on the ground. Therefore, the directional drilling hydraulic tool and instrument delivery device provided by the present invention provide a practical guarantee for the implementation of precise directional coring drilling.

[0020] Compared with the prior art, the present invention has the following advantages and effects:

[0021] 1. The present invention realizes hydraulic long-distance horizontal transportation of an instrument delivery device arranged in a drill pipe by providing a high-pressure water delivery tool composed of a fixed pipe, a high-pressure water pipe, an inlet pipe, a flexible pipe, a hollow short-circuit body, a rubber plug and a sealing element; wherein, the rubber plug in the inlet pipe of the high-pressure water delivery tool and the coordinated arrangement of a plurality of special-structure sealing elements can, on the one hand, allow the steel wire rope arranged on the instrument delivery device to pass through; on the other hand, it can effectively solve the sealing problem of the fixed pipe section at the left end under the action of high-pressure water, thereby providing a guarantee for delivering the instrument delivery device with the steel wire rope from the ground drill pipe to the designated position at the bottom of the hole.

[0022] 2. The instrument delivery device of the present invention is achieved by setting the measuring instrument or the core salvage tool at one end of the ball short circuit, and setting the instrument probe of the wire rope at the other end of the ball short circuit; wherein the ball short circuit is equipped with three groups of bearing assemblies consisting of ball bearings, bearing washers, small shafts and bearing seats. When the ball short circuit drives the measuring instrument or the salvage tool to slide inside the drill pipe, the contact point with the inside of the drill pipe is small, the friction coefficient between them is small, and under the action of water pressure, the sliding distance is long and the sliding speed is fast.

[0023] 3. In the high-pressure water delivery tool described in the present invention, all parts are assembled and fixed by threaded connection, which has the characteristics of convenient assembly, easy disassembly, and convenient storage and transportation. It can be assembled and disassembled with the wellhead drill pipe flexibly and efficiently at the field production site.

[0024] 4. The directional drilling equipment provided by the present invention, which is composed of an instrument delivery device and a directional drilling hydraulic tool, is particularly suitable for directional drilling in soft formations, and can efficiently deliver an instrument with its own wire rope or a core salvage tool with its own wire rope from a ground drill pipe to a specified position at the bottom of the hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 It is a schematic diagram of the cross-sectional structure of the high-pressure water delivery tool described in an embodiment of the present invention.

[0027] Figure 2 It is a schematic diagram of the cross-sectional structure of the second rubber pad according to an embodiment of the present invention.

[0028] Figure 3 FIG. 4 is a top view of the second rubber pad according to an embodiment of the present invention.

[0029] Figure 4 It is a schematic diagram of the cross-sectional structure of the ball short circuit described in an embodiment of the present invention.

[0030] Figure 5 It is a schematic diagram of the short-circuit body structure described in an embodiment of the present invention.

[0031] Figure 6 It is a schematic diagram of the cross-sectional structure of the ball short circuit at AA according to an embodiment of the present invention.

[0032] Figure 7 It is a cross-sectional schematic diagram of the bearing seat described in an embodiment of the present invention.

[0033] Explanation of reference numerals: 1. High-pressure water delivery tool; 11. Rubber plug; 12. Inlet pipe; 13. First rubber pad; 14. Second rubber pad; 15. Opening gasket; 16. Fixed pipe; 17. High-pressure water pipe; 18. Flexible pipe; 19. Sealing gasket; 10. Hollow short-circuit; 2. Longitudinal incision; 3. Center through hole; 4. Ball short-circuit; 41. First connecting section; 42. Second connecting section; 43. Mounting groove; 44. Threaded connecting hole; 5. Bearing seat; 51. Screw mounting hole; 52. Bearing mounting groove; 6. Fastening screw; 7. Ball bearing; 8. Bearing gasket; 9. Small shaft. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with embodiments. The following embodiments are for explanation of the present invention but the present invention is not limited to the following embodiments.

[0035] Embodiment 1:

[0036] Since directional coring drilling requires frequent collection of instrument measurement data from the drill pipe and the recovery of instruments and salvage of drilled cores from the drill pipe, it is particularly important to be able to deliver instruments and core salvage tools to designated locations over long horizontal distances in order to carry out accurate directional coring drilling.

[0037] like Figures 1 to 7 As shown, this embodiment provides a directional drilling device, which is mainly composed of an instrument delivery device and a directional drilling hydraulic tool;

[0038] Among them: On the one hand: Figures 4 to 7 As shown, the instrument delivery device includes a ball short circuit 4, one end of which is threadedly connected to a measuring instrument or a core fishing tool, and the other end of which is threadedly connected to an instrument probe with a wire rope.

[0039] Specifically, the ball short circuit 4 includes a short circuit body and a bearing assembly; wherein: the short circuit body includes a first connecting section 41 and a second connecting section 42, the first connecting section 41 is provided with an external thread for connecting to a measuring instrument or a core fishing tool, the second connecting section 42 is a cylinder, one end of the cylinder is provided with an internal thread matching the instrument probe, and three mounting grooves 43 are milled on the cylinder at 120°, each of the mounting grooves 43 is provided with two threaded connection holes 44; further, the inner diameter of the cylinder matches the inner diameter of the drill pipe;

[0040] like Figure 6 , 7 As shown, the bearing assembly includes a bearing seat 5, a ball bearing 7, a bearing washer 8 and a small shaft 9. The bearing seat 5 is provided with a bearing mounting groove 52 and two screw mounting holes 51 matching the threaded connection holes. The ball bearing 7 is arranged in the bearing mounting groove 52, and the bearing washer 8 is respectively arranged at both ends of the ball bearing 7. The small shaft 9 is horizontally inserted in the ball bearing 7 and the two bearing washer rings 8. The bearing seat 5 is installed and fixed with the two threaded connection holes 44 of the short-circuit body by arranging fastening screws 6 in the screw mounting holes 51 at both ends.

[0041] On the other hand: Figures 1 to 3 As shown, the directional drilling hydraulic tool comprises a high-pressure water delivery tool 1, and the high-pressure water delivery tool 1 comprises a hollow fixed pipe 16, and a high-pressure water pipe 17 is provided on the fixed pipe 16 and connected thereto, and the high-pressure water pipe 17 is connected to a high-pressure water pump;

[0042] One end of the fixed pipe 16 is connected to the hollow inlet pipe 12 through an external thread, and a rubber plug 11 matching with the inlet pipe 12 is provided at the end thereof. A plurality of sealing elements are closely arranged inside the inlet pipe 12, and one end of the plurality of sealing elements is in contact with the rubber plug 11, and the other end is in contact with the end of the fixed pipe 16; the plurality of sealing elements and the rubber plug 11 are respectively provided with pore channels for the steel wire rope provided on the instrument probe to pass through;

[0043] The other end of the fixed pipe 16 is connected to the flexible pipe 18 through an external thread, and the flexible pipe 18 is connected to the hollow short-circuit body 10 through an internal thread, and the hollow short-circuit body 10 is threadedly connected to the drill pipe;

[0044] During directional drilling, the ball short circuit 4 equipped with a measuring instrument or a core fishing tool can be placed inside the drill pipe through the inlet pipe 12, and the wire rope on the instrument probe at the end of the ball short circuit 4 is set in the pore channel of the rubber plug 11 and multiple sealing elements.

[0045] Wherein, the measuring instrument may be a station-mounted instrument.

[0046] like Figure 1 As shown, in the directional drilling hydraulic tool described in the present embodiment 1, the plurality of sealing elements include a first rubber pad 13, an open gasket 15 and a plurality of second rubber pads 14 arranged between the first rubber pad 13 and the open gasket 15, the first rubber pad 13 is arranged in contact with the rubber plug 11, the bottom of the second rubber pad 14 is provided with an annular groove structure which is the same as the bottom structure of the first rubber pad 13; the tops of the plurality of second rubber pads 14 are provided with a conical structure which matches the annular groove structure at the bottom of the first rubber pad 13, the first rubber pad 13 and the second rubber pad 14, and the plurality of second rubber pads 14 are closely arranged by means of the cooperation of the conical structure and the annular groove structure, and the open gasket 15 is provided between the end of the fixed pipe 16 and the inlet pipe 12.

[0047] Specifically, Figure 2 , Figure 3As shown, in this embodiment 1, the second rubber pad 14 is in a combined truncated cone shape in appearance and structure, a truncated cone groove is arranged inside the upper truncated cone structure, and the cross section of the lower truncated cone is M-shaped. The middle positions of the rubber plug 11, the first rubber pad 13 and the plurality of second rubber pads 14 are respectively provided with a central through hole 3 for the steel wire to pass through, and the rubber plug 11, the first rubber pad 13 and the plurality of second rubber pads 14 are respectively provided with a longitudinal cut 2 connected to the central through hole 3 on one side, so as to facilitate the passage of the steel wire and the installation of the rubber pad; wherein, the plurality of second rubber pads 14 can be assembled and fixed by staggered installation to improve the assembly sealing between the plurality of rubber pads.

[0048] Example 2: Figure 1 As shown, in order to further improve the sealing performance of the directional drilling hydraulic tool described in Example 1 in a high-pressure water environment, the high-pressure water pipe 17 can be welded to the fixed pipe 16, and a sealing coating can be provided at the welding point between the fixed pipe 16 and the high-pressure water pipe 17.

[0049] Example 3: Figure 1 As shown, in order to further improve the sealing performance of the directional drilling hydraulic tool described in Example 1 or Example 2 in a high-pressure water environment, a sealing gasket 19 connected to the flexible pipe 18 can be provided between the hollow short-circuit body 10 and the fixed pipe 16.

[0050] The specific method of using the directional drilling equipment described in Examples 1 to 3 of the present invention is as follows:

[0051] When work is needed, first, the borehole drill rod is threadedly connected to the hollow short-circuit body 10 at the right end of the high-pressure water delivery tool 1; then the high-pressure water pump is connected and fixed through the leather hose and the high-pressure water pipe 17;

[0052] Secondly, the drilling instrument or core fishing device equipped with the ball short circuit 4 is placed into the drill pipe through the left end inlet pipe 12 of the high-pressure water delivery tool 1, and the open gasket 15, multiple second rubber pads 14 and the first rubber pad 13 are placed in the inlet pipe 12 in sequence; wherein, the first rubber pad 13 and the second rubber pad 14 both have a central hole of the same diameter for passing the wire rope, and the side is cut with a knife from the outer edge to the small hole in the center of the circle, so as to facilitate the installation of the rubber pad around the wire rope and the passing of the wire rope;

[0053] Finally, a rubber plug 11 is threadedly connected to the inlet pipe 12 on the left side of the first rubber pad 13 to press down the multiple rubber pads passing through the wire rope; at this time, the high-pressure water pump is turned on, and the high-pressure water flows into the fixed pipe 16 through the high-pressure water pipe 17. Since the multiple rubber pads on the left are tightly staggered, the high-pressure water flow on the left is blocked, but a small hole is left in the middle of the rubber pad for the wire cable to pass through; then, under the action of the high-pressure water flow and the bearing of the ball short circuit 4, the measuring instrument or core catching device with the wire rope is pushed to the right end, and reaches the specified position through a long horizontal section in the drill pipe, and directional coreless drilling or directional coring drilling is carried out.

[0054] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different. Any equivalent or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. The technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A directional drilling equipment, characterized in that: Including instrument delivery devices and directional drilling hydraulic tools, The instrument delivery device comprises a ball short circuit, one end of which is threadedly connected to a measuring instrument or a core fishing tool, and the other end of which is threadedly connected to an instrument probe with a steel wire rope; The ball short circuit includes a short circuit body and a bearing assembly; three installation grooves are circumferentially provided on the short circuit body, and two threaded connection holes are respectively provided in each installation groove; the bearing assembly includes a bearing seat, a ball bearing, a bearing washer and a small shaft, the bearing seat is provided with a bearing installation groove, the ball bearing is arranged in the bearing installation groove, the bearing washer is respectively arranged at both ends of the ball bearing, the small shaft is transversely arranged in the ball bearing and the two bearing washer rings, the bearing seat is provided with two screw installation holes matching the threaded connection holes, and the bearing seat is respectively installed and fixed with the two threaded connection holes of the short circuit body by arranging fastening screws in the screw installation holes at both ends; The directional drilling hydraulic tool comprises a high-pressure water delivery tool, and the high-pressure water delivery tool is used to deliver the instrument delivery device; The high-pressure water delivery tool comprises a hollow fixed pipe, a high-pressure water pipe intersecting the fixed pipe is provided on the fixed pipe body, and the high-pressure water pipe is connected to a high-pressure water pump; Wherein: one end of the fixed pipe is threadedly connected to the hollow inlet pipe, the end of the inlet pipe is provided with a rubber plug, a plurality of sealing elements are closely arranged inside the inlet pipe, one end of the plurality of sealing elements is in contact with the rubber plug, and the other end is in contact with the end of the fixed pipe; the plurality of sealing elements and the rubber plug are respectively provided with aperture channels for the steel wire rope provided on the instrument delivery device to pass through; The other end of the fixed pipe is connected to a flexible pipe via an external thread, the flexible pipe is connected to a hollow short-circuit body via an internal thread, and the hollow short-circuit body is threadedly connected to the drill pipe; The plurality of sealing elements include a first rubber pad, an open gasket, and a plurality of second rubber pads disposed between the first rubber pad and the open gasket, the first rubber pad is disposed in contact with the rubber plug, the bottom of the second rubber pad is provided with an annular groove structure having the same structure as the bottom of the first rubber pad; the tops of the plurality of second rubber pads are provided with a conical structure matching the annular groove structure at the bottom of the first rubber pad, the first rubber pad and the second rubber pad, and the plurality of second rubber pads are closely arranged by means of the conical structure and the annular groove structure cooperating with each other, and the open gasket is disposed between the end of the fixed pipe and the inlet pipe; The second rubber pad is in the shape of a combined truncated cone in terms of appearance and structure, a truncated cone groove is arranged inside the upper truncated cone structure, and the cross section of the lower truncated cone is M-shaped; The plurality of second rubber pads are assembled and fixed by staggered installation; When directional drilling is performed, the instrument delivery device is placed inside the drill pipe through an inlet pipe, and the steel wire rope is arranged in the pore channels of the rubber plug and a plurality of sealing elements.

2. A directional drilling equipment according to claim 1, characterized in that: The short-circuit body includes a first connecting section and a second connecting section. The first connecting section is provided with an external thread for connecting to the measuring instrument or the core salvage tool. The second connecting section is a cylinder. One end of the cylinder is provided with an internal thread matching the instrument probe. The three mounting grooves are arranged on the cylinder in a manner of equally dividing the circumference. The outer diameter of the cylinder matches the inner diameter of the drill pipe for directional drilling.

3. A directional drilling equipment according to claim 1, characterized in that: The rubber plug, the first rubber pad and the second rubber pads are respectively provided with a central through hole in the middle for the wire rope to pass through, and the rubber plug, the first rubber pad and the second rubber pads are respectively provided with a longitudinal incision connected to the central through hole on one side.

4. A directional drilling equipment according to claim 1, characterized in that: The high-pressure water pipe is welded on the fixed pipe, and a sealing coating is provided at the welding point between the fixed pipe and the high-pressure water pipe.

5. A directional drilling equipment according to claim 1, characterized in that: A sealing gasket connected to the flexible pipe is arranged between the hollow short-circuit body and the fixed pipe.

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