Discharge device and discharge method for long distance directional drilling

Abstract

The present application relates to the technical field of coal mine drilling equipment, and particularly relates to a slag discharging device and method for long-distance directional drilling. The slag discharging device comprises: a shell provided with a channel, the channel extending along the length direction of the shell and penetrating through both ends of the shell; a water spraying structure arranged on the side wall of the shell, used for forming a local rotational flow or turbulent flow to improve the wrapping capacity of the water flow on the rock slag; and a pressure boosting part arranged in the channel, used for adjusting the water pressure of the water spraying structure. In the present application, the slag discharging device can adjust the degree of strayness of the water flow in the deep hole by optimizing the water spraying structure, form a rotational flow disturbance field at the bottom of the hole, and flush the rock slag settled at the bottom to reduce the rock slag settled at the bottom, thereby solving the problem of slag discharging in long-distance directional drilling construction.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine drilling equipment, and particularly to a slag discharging device and a slag discharging method for long-distance directional drilling. Background Art

[0002] At present, long-distance directional drilling construction underground has been widely used in construction operations such as gas drainage, hydraulic fracturing, and deep-hole blasting. During the drilling process, as the drilling depth increases, when the rock slag at the bottom of the hole returns, due to insufficient backwater impact force and decreased entrainment ability, the slag discharging will be不畅, and it is very easy to get the drill pipe stuck or crushed.

[0003] In the prior art, to solve the slag discharging problem in long-distance directional drilling construction, generally, relevant chemical substances are added to the driving medium of the water-driven motor to increase the liquid entrainment ability for facilitating slag discharging. At the same time, to prevent the rock slag from sinking to the bottom, the drainage flow rate and drainage pressure of the supporting mud pump truck are also increased to improve the slag discharging ability of the liquid.

[0004] However, adding chemical substances will pollute the underground geology, increase the viscosity of water, easily stick the soft rock on the hole wall and cause hole collapse, and also increase the suction resistance of the water supply pump set supporting the drill rig, reducing the service life of the water supply pump set; the method of improving the slag discharging effect by increasing the drainage flow rate and drainage pressure of the mud pump truck is only applicable to improving the slag discharging ability in a short time. Because the mud pump truck operates at a high load for a long time, it will cause rapid damage to the components, seriously reducing the service life of the equipment. Summary of the Invention

[0005] The present invention aims to solve the technical problems existing in the related art. For this purpose, the present invention provides a slag discharging device and a slag discharging method for long-distance directional drilling to solve the slag discharging problem in long-distance directional drilling construction.

[0006] In a first aspect, the present invention provides a slag discharging device for long-distance directional drilling, comprising: A housing provided with a hole passage, the hole passage extending along the length direction of the housing and penetrating through both ends of the housing; A water spraying structure provided on the side wall of the housing for forming local swirl or turbulence to improve the entrainment ability of water flow to the rock slag; A pressurizing part provided in the hole passage for adjusting the water outlet pressure of the water spraying structure.

[0007] According to the slag discharging device for long-distance directional drilling provided by the present invention, the pressurizing part comprises: A baffle, the baffle being inclinedly arranged in the hole passage for changing the water passing cross-sectional area of the hole passage to increase the pressure of the water flow in the area of the baffle.

[0008] According to the present invention, a slag removal device for long-distance directional drilling is provided, wherein the pressurization unit further includes: An adjustment knob, the first end of which extends out of the outer periphery of the housing, and the second end of which penetrates the side wall of the housing and is connected to the baffle for adjusting the tilt angle of the baffle.

[0009] According to the present invention, a slag removal device for long-distance directional drilling is provided, wherein the water spray structure includes: A first water spray hole extends radially along the channel and penetrates the sidewall of the housing; The second water spray hole extends radially along the channel and penetrates the side wall of the housing; The first and second water spray holes are respectively aligned with the two ends of the baffle along the length of the channel to form a multi-stage spray structure.

[0010] According to the present invention, a slag removal device for long-distance directional drilling is provided, wherein the cross-sectional areas of the first water spray hole and the second water spray hole on the side wall of the shell gradually decrease from the inside to the outside, so as to facilitate secondary pressurization.

[0011] According to the present invention, a slag removal device for long-distance directional drilling is provided, wherein the cross-sectional area of ​​the first water spray hole is smaller than that of the second water spray hole, so as to form water spray nozzles with different water flow rates.

[0012] According to the present invention, a slag removal device for long-distance directional drilling is provided, wherein the cross-sectional shape of the first water spray hole is set to be circular or rhomboid; The cross-sectional shape of the second water spray hole is set to be circular or rhomboid.

[0013] A slag removal device for long-distance directional drilling provided by the present invention further includes: A cable-through drill rod connector is provided in the middle of the borehole, and an annular water-passing area is formed between the cable-through drill rod connector and the side wall of the housing.

[0014] According to the present invention, a slag removal device for long-distance directional drilling is provided, wherein the two ends of the housing are provided with threaded structures for connecting drill rods.

[0015] Secondly, the present invention provides a method for removing slag in long-distance directional drilling, employing the slag removal device for long-distance directional drilling described in any one of the above-mentioned methods, the slag removal method comprising: Install the slag removal device near the drill bit end of the drill pipe; Insert the drill pipe into the borehole and start the mud pump to supply high-pressure drive water into the drill pipe; The cuttings removal device directs a portion of the driving water to the drill bit, while the other portion is sprayed into the annular area at the bottom of the hole to flush and lift the rock cuttings deposited there. This causes the rock cuttings to be resuspended in the return water flow, which then exits the borehole through the gap between the drill rod and the borehole wall.

[0016] The above-described one or more technical solutions of this invention have at least one of the following technical effects: By optimizing the water spray structure, the slag removal device can adjust the degree of dispersion of the water flow in deep boreholes, forming a swirling disturbance field at the bottom of the hole, which washes up the settled rock slag to reduce rock slag settling at the bottom, thereby solving the slag removal problem in long-distance directional drilling.

[0017] In addition to the technical problems solved by the present invention, the technical features of the technical solutions constituted by the present invention, and the advantages brought about by the technical features of these technical solutions as described above, other technical features of the present invention and the advantages brought about by these technical features will be further explained in conjunction with the accompanying drawings, or will be learned through the practice of the present invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the slag discharge device provided in an embodiment of the present invention.

[0020] Figure 2 This is a cross-sectional view of the slag discharge device provided in an embodiment of the present invention.

[0021] Figure 3 This is a structural diagram of the end face of the slag discharge device provided in an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the slag removal device provided in an embodiment of the present invention when installed on a drill pipe.

[0023] Figure label: 10. Shell; 11. Channel; 20. Water spray structure; 21. First water spray hole; 22. Second water spray hole; 30. Pressurization unit; 31. Baffle; 32. Adjustment knob; 40. Cable-connecting drill rod joint; 50. Drill rod. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0025] In an embodiment of the present invention, a slag removal device for long-distance directional drilling is described.

[0026] like Figures 1 to 3 As shown, the slag discharge device mainly includes a shell 10, a water spray structure 20, and a pressurization unit 30.

[0027] The housing 10 has a channel 11 extending along its length and passing through both ends of the housing 10. The channel 11 serves as the main channel for high-pressure water flow, allowing high-pressure driven water and the cable drill rod joint 40 to pass through.

[0028] The water spray structure 20 is installed on the side wall of the shell 10 to form a local swirling or turbulent flow in the annular area at the bottom of the borehole, which greatly enhances the water flow's ability to entrain and lift the sediment at the bottom of the borehole.

[0029] The pressurization unit 30 is installed in the channel 11 of the shell 10. By changing the cross-sectional area of ​​the channel 11, the water pressure and flow rate of the water spray structure 20 can be adjusted to meet the slag discharge operation requirements under different drilling depths and different geological rock conditions.

[0030] Specifically, the shell 10 is cylindrical and made of high-strength alloy steel, possessing high resistance to pressure and corrosion. It can withstand the impact of high-pressure water flow and the squeezing force of rock strata within the borehole, and is not easily deformed or damaged. It can adapt to complex long-distance directional drilling conditions such as underground gas extraction, hydraulic fracturing, and deep-hole blasting. The shell 10 has threaded structures at both ends, allowing it to be directly assembled with the drill pipe 50 without modifying the existing drilling equipment structure. It is convenient to disassemble and assemble on site and has extremely high versatility.

[0031] The water jet direction of the water jet structure 20 forms a certain angle with the borehole axis to ensure that the jet water can accurately flush the low-lying sediment area at the bottom of the hole. The pressurization unit 30 is embedded in the middle section of the shell 10 and corresponds to the water jet structure 20 in the length direction of the shell 10.

[0032] In this embodiment, the slag discharge device, through the coordinated operation of the shell 10, the water spray structure 20 and the pressurization unit 30, can create an artificial wave flow area at the bottom of the hole without the need for external chemical agents, using only high-pressure water to fully flush and suspend the settled rock slag. This solves the problems of water flow impact force attenuation, rock slag accumulation at the bottom and poor slag discharge that occur with increasing hole depth in long-distance drilling.

[0033] Based on the above embodiments, the pressurization unit 30 is further defined.

[0034] The pressurization unit 30 includes a baffle 31 inclinedly disposed in the channel 11 to change the cross-sectional area of ​​the channel 11 for water flow, thereby increasing the pressure of the water flow in the area of ​​the baffle 31.

[0035] Specifically, the baffle 31 has a plate-like structure. The baffle 31 is fixed at an angle inside the channel 11 of the housing 10. The side of the baffle 31 is sealed and fitted to the inner wall of the channel 11, and the effective water passage cross-sectional area of ​​the channel 11 is changed by the inclined blocking method.

[0036] When the water flows through the baffle 31, the flow space is reduced, which increases the flow velocity and water pressure, thereby increasing the water pressure of the corresponding area of ​​the spray structure 20 and achieving passive pressure boosting control of the water pressure of the spray structure 20.

[0037] Preferably, the baffle 31 is made of hard alloy with good wear resistance. The surface of the baffle 31 is polished and rust-proofed, which can withstand the erosion of high-pressure water flow for a long time and prevent rust, deformation and failure. The tilt angle of the baffle 31 can be preset, and the conventional tilt angle is set to 30°~60°. This angle range can effectively reduce the cross-sectional area of ​​water flow to achieve pressurization, without excessively blocking the water flow of the main channel of the borehole 11, ensuring normal supply of cooling and slag removal water to the drill bit.

[0038] By setting the inclined baffle 31 structure, the overall structure of the pressurization unit 30 can be simplified and the failure rate of the pressurization unit 30 can be reduced. The water flow can be locally pressurized by changing the cross-sectional area of ​​the channel 11 by using the baffle 31, without the need for external pressurization equipment, which can reduce the equipment investment cost.

[0039] Furthermore, the pressurization unit 30 also includes an adjustment knob 32. The first end of the adjustment knob 32 extends out of the outer periphery of the housing 10, and the second end of the adjustment knob 32 passes through the side wall of the housing 10 and is kinetically connected to the baffle 31 for adjusting the tilt angle of the baffle 31.

[0040] Specifically, the first end of the adjustment knob 32 extends out of the side wall of the housing 10, which is convenient for on-site personnel to operate manually; the second end of the adjustment knob 32 passes through the side wall of the housing 10 and is connected to the baffle 31 in a transmission manner. By rotating the adjustment knob 32, the baffle 31 can be precisely driven to rotate around the hinge point, and the tilt angle of the baffle 31 in the channel 11 can be adjusted in real time.

[0041] Preferably, a sealing sleeve is provided between the adjusting knob 32 and the side wall of the housing 10, which can ensure the flexible rotation of the adjusting knob 32 and seal the high-pressure water flow in the channel 11 to prevent water overflow. The adjusting knob 32 and the baffle 31 can adopt a gear meshing or linkage transmission structure. Rotating the adjusting knob 32 by a certain angle can realize the quantitative adjustment of the tilt angle of the baffle 31, with precise transmission ratio, and can realize continuous stepless control of the water passage cross-sectional area of ​​the channel 11.

[0042] By adding a manually adjustable knob 32, the tilt angle of the baffle 31 can be adjusted on the construction site, thereby changing the water pressure and flow rate of the water spray structure 20 as needed to adapt to different construction conditions such as shallow holes, medium-deep holes, and kilometer-deep holes, thereby improving the efficiency of on-site slag removal operations.

[0043] Based on the above embodiments, the water spray structure 20 is further defined.

[0044] The water spray structure 20 includes a first water spray hole 21 and a second water spray hole 22. The first water spray hole 21 extends radially along the channel 11 and penetrates the side wall of the housing 10. The second water spray hole 22 also extends radially along the channel 11 and penetrates the side wall of the housing 10.

[0045] The first water spray hole 21 and the second water spray hole 22 are aligned with the two ends of the baffle 31 along the length of the channel 11, forming a multi-stage spray structure with axially staggered distribution.

[0046] Specifically, the first water spray hole 21 and the second water spray hole 22 are arranged in a staggered manner, and the axial spacing is set according to the length of the housing 10 and the size of the baffle 31. After the baffle 31 separates the water flow in the channel 11, the high-pressure water flow will flow through the first water spray hole 21 and the second water spray hole 22 in sequence, forming two independent jet water flows.

[0047] The two water streams converge and impact each other in the annular area at the bottom of the borehole, forming a large-scale swirling turbulent flow field. The first water jet 21 is located at the end away from the drill bit, focusing on large-scale flushing of rock cuttings around the borehole wall; the second water jet 22 is located at the end closer to the drill bit, focusing on close-range and powerful impact on the sediment at the bottom of the borehole, forming a graded and zoned slag discharge pattern.

[0048] In this embodiment, the water spray structure 20 adopts a multi-stage spray layout with the first water spray hole 21, the second water spray hole 22 and the baffle 31 axially aligned. It can divert and spray the water flow in the channel 11 in stages. Compared with single-hole spray, it has a wider coverage and richer disturbance levels. The two-stage spray water flows collide and engulf each other, spontaneously forming an artificial wave disturbance zone at the bottom of the hole. This effectively compensates for the attenuation of the impact force of the water flow at the far end of the long-distance borehole. It can both impact and compact the deep rock cuttings bed and prevent the rock cuttings from settling and accumulating again. The staged spray structure has a clear division of labor, and the impact and scouring functions work together to significantly improve the cuttings removal efficiency.

[0049] Furthermore, the cross-sectional configuration of the water spray hole is optimized.

[0050] The first water spray hole 21 and the second water spray hole 22 are both set on the side wall of the shell 10 as conical holes with a gradually decreasing cross-sectional area from the inside to the outside, and the water flow is pressurized twice by using the gradually decreasing hole diameter structure.

[0051] Specifically, the first spray hole 21 and the second spray hole 22 have a large inlet diameter on the inner wall of the shell 10 and a small outlet diameter on the outer wall of the shell 10, forming a smooth conical transition. High-pressure water flows in from the large-diameter inlet, is accelerated and pressurized by the gradually narrowing channel, and is then ejected at high speed from the small-diameter outlet. The convergence angle of the conical hole structure is controlled between 5° and 15°, balancing the pressurization effect and the water flow rate, avoiding the problems of excessive angle causing hole blockage and insufficient pressurization effect due to insufficient angle.

[0052] In this embodiment, the water spray structure 20 can utilize the structural characteristics of the water spray holes gradually narrowing from the inside to the outside to achieve secondary pressurization of the water flow on the basis of the first pressurization by the baffle 31, thereby significantly increasing the outlet velocity and impact kinetic energy of the jet water flow; the high-speed water flow after secondary pressurization can penetrate the thick rock debris bed, completely flushing up and suspending the deep sedimentary rock debris, further improving the long-distance deep hole slag discharge capability.

[0053] Furthermore, the cross-sectional area of ​​the first spray hole 21 is smaller than that of the second spray hole 22, so as to form spray nozzles with different water flow rates.

[0054] Specifically, compared to the second water jet 22, the first water jet 21 is a small-diameter, high-pressure nozzle with a smaller diameter and flow cross-sectional area. After pressurization, the water pressure at the outlet is high, while the instantaneous flow rate is low, resulting in a focused and powerful impact. The second water jet 22 is a large-diameter, high-flow nozzle with a larger flow cross-sectional area, resulting in a sufficient water flow and relatively gentle water pressure, emphasizing large-area surface scouring. The diameter ratio of the first water jet 21 to the second water jet 22 is controlled between 1:1.5 and 1:2 to accommodate the discharge requirements of rock debris of different particle sizes.

[0055] Setting the first water jet 21 and the second water jet 22 as water jets of different specifications can achieve the coordination of high and low pressure and large and small flow rates, taking into account both fixed-point slag breaking and whole-area slag carrying, avoiding the drawbacks of insufficient impact or limited coverage of a single-specification water jet; it can be adapted to different types of drill cuttings such as coarse-grained rock cuttings and fine-powdered rock cuttings, thereby further expanding the application range of the slag discharge device.

[0056] Preferably, the cross-sectional shape of the first water spray hole 21 can be circular or rhomboid. Correspondingly, the cross-sectional shape of the second water spray hole 22 can also be circular or rhomboid. In practical applications, the shapes can be freely combined according to the slag discharge requirements, and combinations of double circular, double rhomboid, or one circular and one rhomboid shape can be used.

[0057] Circular water jets have a simple manufacturing process, produce uniform water flow, and are less prone to stress concentration, making them suitable for ordinary slag removal operations in conventional homogeneous rock formations. Rhomboid water jets have excellent flow guiding effect at their angular edges, resulting in a wider diffusion range after water jetting and making it easier to form swirling turbulence, making them suitable for complex working conditions such as broken rock formations and rock slag with uneven particle size.

[0058] Based on the above embodiments, a cable-connecting drill rod joint 40 is added to the slag discharge device.

[0059] like Figure 3 and Figure 4 As shown, the cable drill pipe joint 40 is fixedly installed at the center of the hole 11 in the housing 10. The outer wall of the cable drill pipe joint 40 and the inner wall of the housing 10 form an annular water passage area, and high-pressure driving water can flow smoothly along this annular water passage area.

[0060] Specifically, the cable-through drill pipe joint 40 features a hollow tubular structure. The central through-hole of the cable-through drill pipe joint 40 allows communication cables and signal lines to pass through, meeting the construction requirements for directional drilling measurement while drilling and signal transmission. The cable-through drill pipe joint 40 is fixedly connected to the inner wall of the housing 10 via a bracket. The circumferential width of the surrounding annular water-passing area is uniform, ensuring consistent circumferential flow velocity and balanced pressure distribution. The annular water-passing area is precisely matched to the positions of the baffle 31 and the two-stage water jet holes, ensuring that the water flow diversion, pressurization, and jetting processes are not interfered with by the cable-through structure.

[0061] In this embodiment, the slag discharge device, through the integrated cable drill rod connector 40, can have dual functions of water discharge and cable signal transmission. This can avoid pressure loss caused by the cable component blocking the annular water passage area, ensuring that the pressurization and jetting effects are not affected, which meets the development needs of intelligent drilling operations.

[0062] Furthermore, such as Figure 4 As shown, the two ends of the housing 10 are provided with threaded structures for connecting the drill rod 50.

[0063] By setting threaded structures at both ends of the housing 10, the slag discharge device can be directly and quickly connected to the existing conventional drill rod 50 and drill bit threads without the need to modify existing equipment or use special adapters. On-site installation and disassembly are simple and quick, and the device has strong construction adaptability.

[0064] Furthermore, in another embodiment of the present invention, a method for removing slag in long-distance directional drilling is described. The slag removal method employs the slag removal device described in any of the above embodiments.

[0065] Slag removal methods include: Install the slag removal device near the drill bit end of the drill rod 50 as an intermediate connecting component between the drill bit and the drill rod 50. During installation, ensure that the water spray hole faces the annular area at the bottom of the borehole and that the assembly is firm without loosening or leakage.

[0066] Insert drill pipe 50 into the borehole and start the mud pump to supply high-pressure driving water into drill pipe 50. Lower drill pipe 50, equipped with the slag removal device, to the designated construction position at the bottom of the directional borehole and calibrate the coaxiality of the borehole axis with that of drill pipe 50. Start the on-site mud pump unit to continuously supply high-pressure driving water into the borehole through the internal channels of drill pipe 50.

[0067] After the high-pressure driven water enters the shell 10 of the slag discharge device, part of the water flow is directly guided to the drill bit along the main channel of the channel 11 and the central passage of the cable drill rod joint 40 to provide cooling and rock breaking water supply for the drill bit; the other part of the water flow is intercepted by the baffle 31 of the pressurization section 30 and is sprayed to the annular area at the bottom of the hole through the first water spray hole 21 and the second water spray hole 22. The high-pressure spray water flow forms local swirling and turbulent flow, which powerfully washes and lifts the rock cuttings bed deposited at the bottom of the hole, so that the settled rock cuttings are resuspended evenly in the water flow.

[0068] The return water carrying rock cuttings flows naturally back from the bottom of the hole to the opening along the annular space between the outer wall of the drill rod 50 and the borehole wall, eventually carrying all the rock cuttings out of the borehole smoothly, and continuously circulating to complete the entire cuttings removal operation of long-distance directional drilling.

[0069] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0070] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0071] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0072] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms are not limited to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A debris removal device for long distance directional drilling, characterized by, include: The housing (10) is provided with a channel (11) which extends along the length of the housing (10) and passes through both ends of the housing (10); A water spray structure (20) is provided on the side wall of the shell (10) to form a local swirling or turbulent flow to improve the water flow's ability to entrain rock debris; A pressurization unit (30) is provided inside the channel (11) for adjusting the water pressure at the outlet of the water spray structure (20).

2. The slag removal device for long-distance directional drilling according to claim 1, characterized in that, The pressurization unit (30) includes: A baffle (31) is inclinedly disposed in the channel (11) to change the cross-sectional area of ​​the channel (11) for water flow, thereby increasing the pressure of the water flow in the area of ​​the baffle (31).

3. The slag removal device for long-distance directional drilling according to claim 2, characterized in that, The pressurization unit (30) also includes: An adjustment knob (32) has its first end suspended on the outer periphery of the housing (10), and its second end penetrates the side wall of the housing (10) and is connected to the baffle (31) for adjusting the tilt angle of the baffle (31).

4. The slag removal device for long-distance directional drilling according to claim 2 or 3, characterized in that, The water spray structure (20) includes: The first water spray hole (21) extends radially along the channel (11) and penetrates the side wall of the housing (10); The second water spray hole (22) extends radially along the channel (11) and penetrates the side wall of the housing (10); The first water spray hole (21) and the second water spray hole (22) are respectively aligned with the two ends of the baffle (31) along the length of the channel (11) to form a multi-stage spray structure.

5. The slag removal device for long-distance directional drilling according to claim 4, characterized in that, The cross-sectional area of ​​the first water spray hole (21) and the second water spray hole (22) on the side wall of the housing (10) gradually decreases from the inside to the outside, so as to facilitate secondary pressurization.

6. The slag removal device for long-distance directional drilling according to claim 4, characterized in that, The cross-sectional area of ​​the first water spray hole (21) is smaller than that of the second water spray hole (22) to form water spray nozzles with different water flow rates.

7. The slag removal device for long-distance directional drilling according to claim 6, characterized in that, The cross-sectional shape of the first water spray hole (21) is set to be circular or rhomboid; The cross-sectional shape of the second water spray hole (22) is set to be circular or rhomboid.

8. The slag removal device for long-distance directional drilling according to claim 7, characterized in that, Also includes: Cable-through drill rod connector (40) is located in the middle of the channel (11), and an annular water-passing area is formed between the cable-through drill rod connector (40) and the side wall of the housing (10).

9. The slag removal device for long-distance directional drilling according to claim 8, characterized in that, The housing (10) has threaded structures at both ends for connecting the drill rod (50).

10. A method for removing slag in long-distance directional drilling, characterized in that, The slag removal device for long-distance directional drilling as described in any one of claims 1 to 9, wherein the slag removal method includes: Install the slag removal device on the drill rod (50) near the drill bit end; Insert the drill pipe (50) into the borehole, start the mud pump, and supply high-pressure drive water into the drill pipe (50); A portion of the driving water is directed to the drill bit through the slag removal device, while another portion of the driving water is sprayed into the annular area at the bottom of the hole to flush and lift the rock cuttings deposited at the bottom of the hole, so that the rock cuttings are resuspended in the return water flow. The return water flow is discharged from the borehole along the gap between the drill rod (50) and the hole wall.

Images