A high-pressure water jet drilling tool and drilling method

Abstract

This invention discloses a high-pressure water jet drilling tool and drilling method. The drilling tool includes a high-pressure water jet drill bit, a flexible drill rod, and a directional guide tube. Two high-pressure water drive nozzles and multiple high-pressure water jet nozzles are arranged on the cutterhead of the high-pressure water jet drill bit. The two high-pressure water drive nozzles are used to drive the drill bit to rotate through the water jet, which can save a significant amount of external driving force. The multiple high-pressure water jet nozzles are distributed at different positions on the cutterhead, and each high-pressure water jet nozzle is slightly tilted at a certain angle while facing directly forward. This allows the circular rock wall in front to be cut into a hollow shape during water jet cutting, and the width of the uncut annular rock root becomes smaller, resulting in poor stability. Further cutting with cutting teeth can accelerate the drilling progress. This non-contact drilling method of the present invention, combined with the directional constraint of the directional guide tube, can effectively ensure that the borehole advances in the set direction.

Description

Technical Field

[0001] This invention relates to the field of drilling technology, specifically to a high-pressure water jet drilling tool and drilling method. Background Technology

[0002] In underground coal mines, long boreholes are typically drilled to obtain information on distant gas storage or rock strata characteristics. Traditional drilling methods use carbide drill bits to rotate and cut through the rock strata, and drill by continuously connecting rigid drill rods. This method is inefficient, and because of the varying hardness of the rock strata, the drill bit will naturally deflect to one side when encountering hard rock, causing the drill hole to deviate from the intended direction. Summary of the Invention

[0003] In order to overcome the defects in the prior art, the present invention proposes a high-pressure water jet drilling tool and drilling method, which can greatly improve the drilling efficiency and hole quality, and also make the borehole travel in a set direction without deviation.

[0004] The technical solution adopted by this invention is as follows: Firstly, this invention proposes a high-pressure water jet drilling tool, characterized in that it includes…

[0005] A high-pressure water jet drill bit includes a cutterhead, a central connecting body, and a connector connected in sequence. At least two high-pressure water drive nozzles and multiple high-pressure water jet nozzles are provided on the cutterhead. The high-pressure water drive nozzles are installed at the edge of the cutterhead, and the jet direction is tangential to the cutterhead, and all nozzles are either clockwise or counterclockwise. The high-pressure water jet nozzles are distributed at different positions from the center point of the cutterhead surface, and the jet direction is in front of the cutterhead.

[0006] A flexible drill rod, used to provide high-pressure water to the high-pressure water jet drill bit, includes a high-pressure flexible tube and a connecting seat, wherein the front end of the connecting seat is inserted into the connecting head and the rear end is connected to the high-pressure flexible tube;

[0007] A directional guide cylinder is used to guide the high-pressure water jet drill bit during drilling. The directional guide cylinder is detachably connected to the outside of the connecting seat, and its front end is located behind the cutter head.

[0008] As a further improvement of the present invention, a plurality of cutting teeth are arranged on the cutter head, and the high-pressure water jet nozzle is arranged between the cutting teeth; the height of the high-pressure water drive nozzle and the high-pressure water jet nozzle are both less than the height of the cutting teeth.

[0009] As a further improvement of the present invention, a bearing mounting platform I and a bearing mounting platform II are provided on the connector head, and a high-pressure water drive inlet and a high-pressure water jet inlet are provided between the bearing mounting platform I and the bearing mounting platform II; a water flow channel from the high-pressure water drive inlet to the high-pressure water drive nozzle and a water flow channel from the high-pressure water jet inlet to the high-pressure water jet nozzle are provided in both the middle connector and the connector head.

[0010] As a further improvement of the present invention, the connecting seat is provided with a drive nozzle water supply channel, a jet cutting nozzle water supply channel, and a cavity area. Within the cavity area, starting from the head of the connecting seat, there are sequentially arranged a bearing mounting area I, a drive nozzle water supply groove, a jet cutting nozzle water supply groove, and a bearing mounting area II. The drive nozzle water supply groove is connected to the drive nozzle water supply channel, and the jet cutting nozzle water supply groove is also connected to the jet cutting nozzle water supply channel. The bearing mounting area I and bearing mounting area II are used to mount bearings. When the high-pressure water jet drill bit is connected to the flexible drill rod, the connecting head of the high-pressure water jet drill bit is inserted into the cavity area of ​​the connecting seat of the flexible drill rod. The high-pressure water drive inlet is connected to the drive nozzle water supply groove, and the high-pressure water jet inlet is connected to the jet cutting nozzle water supply groove. Bearings are mounted in the bearing mounting area I and bearing mounting area II, and the high-pressure water jet drill bit rotates relative to the flexible drill rod through the two bearings.

[0011] As a further improvement of the present invention, there are four high-pressure water jet nozzles, which are sequentially named high-pressure water jet nozzle I, high-pressure water jet nozzle II, high-pressure water jet nozzle III, and high-pressure water jet nozzle IV from the edge of the cutter head towards the center. The jet direction of high-pressure water jet nozzle I is offset by a certain angle from the edge of the cutter head in the forward direction; the jet direction of high-pressure water jet nozzle II is offset by a certain angle from the front away from the jet direction of high-pressure water jet nozzle I; the jet direction of high-pressure water jet nozzle III is parallel to the jet direction of high-pressure water jet nozzle I; and the jet direction of high-pressure water jet nozzle IV is parallel to the jet direction of high-pressure water jet nozzle II.

[0012] As a further improvement of the present invention, the diameter of the high-pressure water driven nozzle is larger than the diameter of the high-pressure water jet nozzle.

[0013] As a further improvement of the present invention, the directional guide cylinder has a plurality of water guide grooves evenly distributed on its outer circumference, extending along the length of the cylinder.

[0014] As a further improvement of the present invention, both the high-pressure water jet nozzle and the high-pressure water drive nozzle spray out pure high-pressure water or high-pressure water abrasive.

[0015] Secondly, the present invention also proposes a high-pressure water jet drilling method, based on the high-pressure water jet drilling tool described above, comprising the following steps:

[0016] Step S1: Determine the direction of the hole to be drilled;

[0017] Step S2: Drill a guide hole of a certain length on the rock wall along the set drilling direction. The length of the guide hole is less than the length of the directional guide tube.

[0018] Step S3: Insert the high-pressure water jet drill bit into the guide hole so that the circular wall at the top of the guide hole does not contact the cutter head, and extend the directional guide drill cylinder into the guide hole together with the high-pressure water jet drill bit.

[0019] Step S4: Turn on the high-pressure pump. The high-pressure water abrasive is sprayed out from two high-pressure water drive nozzles and four high-pressure water jet nozzles through the high-pressure flexible pipe. The high-pressure water drive nozzles drive the high-pressure water jet drill bit to rotate, while the water jets from the four high-pressure water jet nozzles break the circular wall at the top of the guide hole.

[0020] Step S5: Advance the high-pressure water jet drill bit forward, and the cutting teeth break the wall surface cut by the water jet. The broken water debris flows out of the borehole from the water guide groove on the directional guide tube.

[0021] Step S6: Continuously feed the flexible drill rod into the cut hole. Through the cutting direction of the high-pressure water jet and the cooperation between the directional guide tube and the hole wall, the hole is continuously advanced in the set direction.

[0022] As a further improvement of the present invention, in step S6, when encountering hard rock and slowing down the drilling speed, the pressure of the high-pressure water abrasive is increased by a high-pressure pump, and the advance speed of the flexible drill rod is slowed down.

[0023] The beneficial effects of this invention are:

[0024] (1) The present invention provides two high-pressure water-driven nozzles on the cutter head of the high-pressure water jet drill bit, which are arranged on the edge of the cutter head and the water jet direction is clockwise or counterclockwise. With the help of the high-pressure water jets sprayed by them, the reaction force generated by the rock wall drives the drill bit and drill rod to generate self-rotation, eliminating the need for the rotation power provided by the drilling rig. Four high-pressure water jet nozzles are set on the cutter head, which are located at different positions on the cutter head. When cutting the rock wall in front, the wall can be cut into a hollow rock body with a certain depth. The hard rock wall is pre-crushed first, and then the hollow rock body is further crushed by the cutting teeth arranged on the cutter head, so that the rock wall can be easily cut.

[0025] (2) The four high-pressure water jet nozzles of the present invention have a nozzle direction that is slightly deviated from the front, which can further reduce the width of the root of the hollowed-out rock body, thereby reducing its stability, greatly reducing the cutting resistance of the cutting teeth, thereby improving the drilling efficiency, and allowing the drilling direction to advance in the predetermined direction.

[0026] (3) The present invention provides a directional guide tube on the drill bit. Since the directional guide tube moves forward together with the drill bit, a directional constraint is formed between the directional guide tube and the formed borehole wall, so that the borehole can only be drilled forward or in one direction. At the same time, combined with the non-contact cutting of the high-pressure water jet nozzle and the easy cutting of the cutting teeth, the resistance encountered in front is very small. Therefore, the two work together to effectively ensure that the borehole moves in the predetermined direction.

[0027] (4) The flexible drill rod of the present invention does not rotate during the drilling process, thus greatly reducing its friction with the borehole wall and ensuring its service life. At the same time, compared with the rigid drill rod with a fixed length of 1-2 meters, the flexible drill rod can be set to be longer, such as 50 meters or 100 meters, and does not need to be replaced frequently, which can greatly improve the efficiency of drilling construction. Attached Figure Description

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Figure 1 This is a schematic diagram of the overall structure of the high-pressure water jet drill of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of the water jet drill bit of the present invention;

[0031] Figure 3 This is a schematic diagram of the front end of a water jet drill bit;

[0032] Figure 4 This is a schematic diagram of the internal structure of the connector;

[0033] Figure 5 This is a schematic diagram of the flexible drill pipe structure;

[0034] Figure 6 This is a schematic diagram of the connecting seat structure for flexible drill pipes;

[0035] Figure 7 This is a schematic diagram of the directional guide tube.

[0036] In the diagram, 1-high-pressure water jet drill bit, 11-cutter head, 110-high-pressure water drive nozzle, 111-high-pressure water jet nozzle, 1110-high-pressure water jet nozzle I, 1111-high-pressure water jet nozzle II, 1112-high-pressure water jet nozzle III, 1113-high-pressure water jet nozzle IV, 112-cutting tooth, 12-middle connector, 13-connector, 131-bearing mounting platform I, 132-bearing mounting platform II, 133-high-pressure water drive inlet, 13 4-High-pressure water jet inlet; 2-Flexible drill rod; 21-High-pressure flexible pipe; 22-Connecting seat; 221-Drive nozzle water supply channel; 222-Jet cutting nozzle water supply channel; 223-Bearing installation area I; 224-Drive nozzle water supply groove; 225-Jet cutting nozzle water supply groove; 226-Bearing installation area II; 227-Sealing ring annular groove I; 228-Sealing ring annular groove II; 229-Sealing ring annular groove III; 3-Directional guide cylinder; 31-Water guide groove. Detailed Implementation

[0037] This invention proposes a high-pressure water jet drilling tool that can be widely used in multiple fields, such as coalbed methane development, mine drainage, oil well drilling, geological exploration, and tunnel and underground engineering.

[0038] like Figure 1 As shown, the high-pressure water jet drilling tool includes a water jet drill bit 1, a flexible drill rod 2, and a directional guide tube 3. (As shown...) Figures 2-4 As shown, the water jet drill bit 1 includes a cutter head 11, a central connecting body 12, and a connecting head 13. The cutter head 11 is threadedly connected to the central connecting body 12, and the central connecting body 12 is threadedly connected to the connecting head 13. Two high-pressure water-driven nozzles 110, four high-pressure water jet nozzles 111, and four cutting teeth 112 are provided on the cutter head 11. The two high-pressure water-driven nozzles 110 are located on the edge of the cutter head 11, and their jetting direction is tangential to the outer periphery of the cutter head 11, with each tangential direction being either clockwise or counterclockwise. The four high-pressure water jet nozzles 111 are located on the inner surface of the cutter head 11, and their jetting direction is towards the front of the cutter head 11. The four high-pressure water jet nozzles 111 are distributed at different positions on the cutter head from the center point. The high-pressure water jet nozzles 111 are all located between the two cutting teeth 112, and their height is less than that of the cutting teeth 112, so that the high-pressure water jet nozzles 111 and the high-pressure water driven nozzles 110 can be protected during drilling.

[0039] The connector 13 is provided with two bearing mounting platforms, namely bearing mounting platform I131 and bearing mounting platform II132. Between the two bearing mounting platforms, there is a high-pressure water drive inlet 133 and a high-pressure water jet inlet 1134. Inside the connector 13 and inside the middle connecting body 12, there are water flow channels from the high-pressure water drive inlet 133 to the high-pressure water drive nozzle 110, and water flow channels from the high-pressure water jet inlet 134 to the high-pressure water jet nozzle 111.

[0040] like Figure 3 As shown, there are four high-pressure water jet nozzles 111, which are sequentially named high-pressure water jet nozzle I1110, high-pressure water jet nozzle II1111, high-pressure water jet nozzle III1112, and high-pressure water jet nozzle IV1113 from the edge of the cutter head 11 inwards. The jet direction of high-pressure water jet nozzle I1110 is offset by a certain angle from the edge of the cutter head 11 closest to the front, with an offset angle of 5-10 degrees. The jet direction of high-pressure water jet nozzle II1111 is offset by a certain angle from the front to the side away from the jet direction of high-pressure water jet nozzle I1110, with an offset angle of 5-10 degrees. The jet direction of high-pressure water jet nozzle III1112 is parallel to the direction of high-pressure water jet nozzle I1110, and the jet direction of high-pressure water jet nozzle IV1113 is parallel to the jet direction of high-pressure water jet nozzle II1111.

[0041] like Figure 5 and Figure 6 The diagram shows the structure of the flexible drill rod 2. The flexible drill rod 2 comprises two parts: a high-pressure flexible tube 21 and a connecting seat 22, which is used to connect with the connector 13. The high-pressure flexible tube 21 is a pressure-resistant rubber tube. The connecting seat 22 contains a drive nozzle water supply channel 221, a jet cutting nozzle water supply channel 222, and a cavity area. Within the cavity area, starting from the head of the connecting seat 22, there are sequentially arranged bearing mounting areas I223, drive nozzle water supply groove 224, jet cutting nozzle water supply groove 225, and bearing mounting areas II226. The drive nozzle water supply groove 224 is connected to the drive nozzle water supply channel 221, and the jet cutting nozzle water supply groove 225 is connected to the jet cutting nozzle water supply channel 222. Bearing mounting areas I223 and II226 are used to mount bearings. Specifically, both the drive nozzle water supply groove 224 and the jet cutting nozzle water supply groove 225 are annular grooves.

[0042] Within the cavity area, a sealing ring annular groove I227 is provided between the bearing mounting area I223 and the drive nozzle water supply groove 224; a sealing ring annular groove 228 is provided between the drive nozzle water supply groove 224 and the jet cutting nozzle water supply groove 225; and a sealing ring annular groove III 229 is provided between the jet cutting nozzle water supply groove 225 and the bearing mounting area II 226. Sealing rings are provided in sealing ring annular grooves I227, II 228, and III 229 to prevent water from entering the bearing mounting area I23 and II 26, and to isolate the drive nozzle water supply groove 224 from the jet cutting nozzle water supply groove, forming two independent water channels.

[0043] The flexible drill rod of this invention is made of pressure-resistant rubber tubing. Compared to existing technologies, its length can be made much longer, such as 50 meters or 100 meters, while traditional rigid drill rods are usually only 1-2 meters long. These require frequent drill rod replacements during drilling, and due to the numerous splicing points, leaks are prone to occur. The flexible drill rod of this invention significantly reduces the number of splicing points, thereby reducing leakage points. Furthermore, the flexible drill rod can be stored by winding it up, greatly reducing its space occupation.

[0044] like Figure 7 As shown, the directional guide cylinder 3 is cylindrical, with a length of 1-2 meters. One end is provided with an internal thread, and a water guide groove 31 extending along its length direction is provided on its exterior along the circumference.

[0045] When connecting the high-pressure water jet drill bit 1 and the flexible drill rod 2, the connector 13 is connected to the connector 22, bearings are installed on the bearing mounting area I223 and the bearing mounting area II226 respectively, the drive nozzle water supply tank 224 is connected to the high-pressure water drive inlet 133, and the high-pressure water jet water supply tank 225 is connected to the high-pressure water jet inlet 134.

[0046] The working principle of the high-pressure water jet drill of the present invention is as follows:

[0047] High-pressure water enters from the flexible drill rod 2 and is ejected from the high-pressure water drive nozzle 110. Since the two high-pressure water drive nozzles 110 are located on the edge of the cutter head 11 and the jet direction is the tangent direction of the outer circle of the cutter head 11, both directions are clockwise or counterclockwise. Therefore, when the two jets are ejected in the borehole, their point of action is the borehole wall. The reaction action can make the cutter head 11, together with the middle connecting body 12 and the connecting head 13, rotate continuously relative to the flexible drill rod 2.

[0048] Four high-pressure water jet nozzles are arranged on the cutterhead 11, with the jet direction facing forward. This forward direction refers to the circular wall surface of the borehole in front of the nozzle; the jet direction can only act on this circular wall surface. It can be directly in front or slightly angled forward, but the impact point of the water jet must be on the circular wedge surface. In this embodiment, the four high-pressure water jet nozzles are arranged on circular surfaces of different radii within the cutterhead 11, meaning each nozzle is at a different distance from the center point. This allows the four nozzles to cut four annular grooves when the cutterhead 11 rotates, dividing the wall surface of the circular borehole into annular grooves adjacent to the annular rock mass. The cutting teeth 112 on the cutterhead 11 then cut the rock mass, making it very easy to cut it off. In this embodiment, the four high-pressure water jet nozzles are slightly offset to both sides from the directly in front reference point. This allows the high-pressure water jet nozzles 110 to cut obliquely, thinning the root of the annular rock mass, thus making it easier for the cutting teeth 112 to cut.

[0049] When installing the directional guide tube 3, simply mate its threaded end with the external thread on the connecting seat 22. Multiple circumferentially arranged water guide grooves 31 are provided on its outer surface, allowing water slag to flow out from the water guide grooves 31 towards the borehole outlet during waterjet cutting.

[0050] In this embodiment, the water jet pressure of the high-pressure water-driven nozzle 110 is less than that of the high-pressure water jet nozzle 111, so that it only has the ability to drive the drill bit to rotate but not the cutting force. Its nozzle diameter can be set to be larger than the nozzle diameter of the high-pressure water jet nozzle 111.

[0051] This invention also discloses a high-pressure water jet drilling method, which specifically includes the following steps:

[0052] Step S1: Determine the direction of the borehole. Based on the strike, dip, and dip angle of the rock strata, determine the optimal direction for drilling.

[0053] Step S2: Drill a guide hole of a certain length on the rock wall along the set drilling direction. The length of the guide hole is less than the length of the directional guide cylinder 3.

[0054] Step S3: Insert the high-pressure water jet drill bit 1 into the guide hole so that the circular wall at the top of the guide hole does not contact the cutter head 11, and extend the directional guide drill cylinder 3 into the guide hole together with the high-pressure water jet drill bit 1.

[0055] Step S4: Turn on the high-pressure pump. The high-pressure water abrasive is ejected from two high-pressure water drive nozzles 110 and four high-pressure water jet nozzles 111 through the high-pressure flexible pipe 21. The high-pressure water drive nozzles 110 drive the high-pressure water jet drill bit 1 to rotate. At the same time, the water jets from the four high-pressure water jet nozzles 111 break the circular wall at the top of the guide hole.

[0056] Step S5: Advance the high-pressure water jet drill bit forward, and the cutting teeth 112 break the wall surface cut by the water jet. The broken water slag flows out of the borehole from the water guide groove 31 on the directional guide cylinder 3.

[0057] Step S6: Continuously feed the flexible drill rod 2 into the cut borehole. Through the cutting direction of the high-pressure water jet and the cooperation between the directional guide cylinder 3 and the borehole wall, the borehole is continuously advanced in the set direction. When encountering hard rock and slowing down the drilling speed, the pressure of the high-pressure water abrasive is increased by the high-pressure pump, and the advancing speed of the flexible drill rod 2 is reduced.

[0058] This invention achieves two objectives: firstly, it enables the drill bit to travel in a straight line, maintaining its direction even when encountering hard rock; secondly, it allows for rapid cutting of rock, increasing drilling speed. The principle behind its straight-line travel is twofold. Firstly, the abrasive water jet from the nozzle cuts the circular wall of the borehole without contact. When encountering hard rock, the direction of the water jet remains unchanged, only its speed decreases, without affecting the drilling direction. Therefore, there is no resistance that causes the drill bit to tilt to one side or change direction. Secondly, by incorporating a directional guide cylinder 3, which works in conjunction with the water jet drill bit 1, when the drilling direction becomes tilted, the guide cylinder 3, whose outer diameter is approximately equal to the borehole diameter, can correct the drilling direction through its interaction with the borehole.

[0059] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes that can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention are all within the protection scope of the claims of the present invention.

Claims

1. A high-pressure water jet drilling tool, characterized in that, include A high-pressure water jet drill bit (1) includes a cutter head (11), a central connecting body (12), and a connector (13) connected in sequence. At least two high-pressure water drive nozzles (110) and multiple high-pressure water jet nozzles (111) are provided on the cutter head (11). The high-pressure water drive nozzles (110) are installed at the edge of the cutter head (11), and the jet direction is the tangential direction of the cutter head (11), and all of them are either clockwise or counterclockwise. The high-pressure water jet nozzles (111) are distributed at different positions from the center point of the cutter head (11), and the jet direction is in front of the cutter head (11). The flexible drill rod (2) is used to provide high-pressure water to the high-pressure water jet drill bit (1), and includes a high-pressure flexible tube (21) and a connecting seat (22). The front end of the connecting seat (22) is inserted into the connecting head (13), and the rear end is connected to the high-pressure flexible tube (21). The directional guide cylinder (3) is used to guide the high-pressure water jet drill bit (1) during drilling. The directional guide cylinder (3) is detachably connected to the external of the connecting seat (22), and its front end is located behind the cutter head (11). Multiple cutting teeth (112) are also arranged on the cutter head (11), and the high-pressure water jet nozzle (111) is arranged between the cutting teeth (112); the height of the high-pressure water drive nozzle (110) and the high-pressure water jet nozzle (111) is smaller than the height of the cutting teeth (112); A bearing mounting platform I (131) and a bearing mounting platform II (132) are provided on the connector (13). A high-pressure water drive inlet (133) and a high-pressure water jet inlet (134) are provided between the bearing mounting platform I (131) and the bearing mounting platform II (132). In the middle connector (12) and the connector (13), there are water flow channels from the high-pressure water drive inlet (133) to the high-pressure water drive nozzle (110) and from the high-pressure water jet inlet (134) to the high-pressure water jet nozzle (111). The connecting seat (22) is provided with a drive nozzle water supply channel (221), a jet cutting nozzle water supply channel (222), and a cavity area. Within the cavity area, starting from the head of the connecting seat (22), there are sequentially arranged a bearing mounting area I (223), a drive nozzle water supply groove (224), a jet cutting nozzle water supply groove (225), and a bearing mounting area II (226). The drive nozzle water supply groove (224) is connected to the drive nozzle water supply channel (221), and the jet cutting nozzle water supply groove (225) is connected to the jet cutting nozzle water supply channel (222). The bearing mounting area I (223) and bearing mounting area II (226) are used to mount bearings. The high-pressure water jet drill bit ( 1) When connected to the flexible drill rod (2), the connector (13) of the high-pressure water jet drill bit (1) is inserted into the cavity of the connector seat (22) of the flexible drill rod (2). The high-pressure water drive inlet (133) is connected to the drive nozzle water supply groove (224), and the high-pressure water jet inlet (134) is connected to the jet cutting nozzle water supply groove (225). Bearings are installed in the bearing mounting area I (223) and the bearing mounting area II (226). The high-pressure water jet drill bit (1) rotates relative to the flexible drill rod (2) through the two bearings. Multiple water guide grooves (31) extending along the length of the cylinder are evenly distributed on the outer circumference of the directional guide cylinder (3).

2. The high-pressure water jet drilling tool according to claim 1, characterized in that, There are four high-pressure water jet nozzles (111), which are named in sequence from the edge to the center of the cutter head (11) as high-pressure water jet nozzle I (1110), high-pressure water jet nozzle II (1111), high-pressure water jet nozzle III (1112), and high-pressure water jet nozzle IV (1113). The jet direction of high-pressure water jet nozzle I (1110) is offset by a certain angle from the edge of the cutter head (11) in the forward direction; the jet direction of high-pressure water jet nozzle II (1111) is offset by a certain angle from the front away from the jet direction of high-pressure water jet nozzle I (1110); the jet direction of high-pressure water jet nozzle III (1112) is parallel to the jet direction of high-pressure water jet nozzle I (1110); and the jet direction of high-pressure water jet nozzle IV (1113) is parallel to the jet direction of high-pressure water jet nozzle II (1111).

3. The high-pressure water jet drilling tool according to claim 2, characterized in that, The diameter of the high-pressure water-driven nozzle (110) is larger than the diameter of the high-pressure water jet nozzle (111).

4. The high-pressure water jet drilling tool according to any one of claims 1-3, characterized in that, Both the high-pressure water jet nozzle (111) and the high-pressure water drive nozzle (110) spray out pure high-pressure water or high-pressure water abrasive.

5. A high-pressure water jet drilling method, based on the high-pressure water jet drilling tool according to any one of claims 1-3, characterized in that, Includes the following steps: Step S1: Determine the direction of the hole to be drilled; Step S2: Drill a guide hole of a certain length on the rock wall along the drilling direction. The length of the guide hole is less than the length of the directional guide cylinder (3). Step S3: Send the high-pressure water jet drill bit (1) into the guide hole so that the circular wall at the top of the guide hole does not contact the cutter head (11), and the directional guide drill cylinder (3) extends into the guide hole together with the high-pressure water jet drill bit (1). Step S4: Turn on the high pressure pump. The high pressure water abrasive is ejected from at least two high pressure water drive nozzles (110) and multiple high pressure water jet nozzles (111) through the high pressure flexible tube (21). The high pressure water drive nozzles (110) drive the high pressure water jet drill bit (1) to rotate. At the same time, the water jets from multiple high pressure water jet nozzles (111) break the circular wall at the top of the guide hole. Step S5: Advance the high-pressure water jet drill bit forward, and the cutting teeth (112) break the wall surface cut by the water jet. The broken water slag flows out of the borehole from the water guide groove (31) on the directional guide cylinder (3). Step S6: Continuously feed the flexible drill rod (2) into the cut hole. Through the cutting direction of the high-pressure water jet and the cooperation between the directional guide tube (3) and the hole wall, the hole is continuously advanced in the set direction.

6. The high-pressure water jet drilling method according to claim 5, characterized in that, In step S6, when encountering hard rock and slowing down the drilling speed, the pressure of the high-pressure water abrasive is increased by a high-pressure pump, and the advance speed of the flexible drill rod (2) is reduced.

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