High-pressure water jet drilling tool and drilling method

Abstract

The invention discloses a high-pressure water jet drilling tool and a drilling method. The drilling tool comprises a high-pressure water jet drill bit, a flexible drill rod and a directional guide cylinder. Two high-pressure water driving nozzles and a plurality of high-pressure water jet nozzles are arranged on a cutter head of the high-pressure water jet drill bit, and the two high-pressure water driving nozzles are used for driving the drill bit to generate self-rotation through water jet, so that a large amount of external driving force can be saved. The multiple high-pressure water jet nozzles are distributed at different positions of the cutter head, and each high-pressure water jet nozzle slightly inclines by a certain angle on the basis of facing the right ahead, so that during water jet cutting, a front circular rock wall can be cut into a hollow shape, the width of the root of an uncut annular rock body becomes smaller, the stability becomes poor, and the cutting efficiency is improved. And the cutting teeth are used for further cutting, so that the drilling progress can be accelerated. The non-contact drilling mode is combined with directional constraint of the directional guide cylinder, and it can be effectively guaranteed that a drilled hole advances in the set direction.

Description

Technical Field

[0001] The invention relates to the technical field of drilling tools, and in particular to a high-pressure water jet drilling tool and a drilling method. Background Art

[0002] In coal mines, long boreholes are usually needed to obtain information about gas storage or the properties of rock formations in the distance. The traditional drilling method uses a carbide drill bit to cut the rock formation by rotation and drills by continuously connecting a rigid drill rod. The drilling efficiency is low. Due to the different hardness of the rock formation, the drill bit will naturally deviate to one side when encountering hard rock, causing the drilled hole to deviate from the predetermined 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 a drilling method, which can greatly improve the drilling construction efficiency and hole quality, and can also make the drilling proceed in a set direction without deviation.

[0004] The technical solution adopted by the present invention is: in the first aspect, the present invention proposes a high-pressure water jet drilling tool, which is characterized by comprising

[0005] A high-pressure water jet drill bit, comprising a cutter disc, a middle connector and a connector connected in sequence, wherein at least two high-pressure water drive nozzles and a plurality of high-pressure water jet nozzles are arranged on the cutter disc, wherein the high-pressure water drive nozzles are installed at the edge of the cutter disc, and the jet direction is the tangent direction of the cutter disc, and is all clockwise or counterclockwise; the high-pressure water jet nozzles are distributed at different positions from the center point of the cutter disc surface, and the jet direction is the front of the cutter disc;

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

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

[0008] As a further improvement of the present invention, a plurality of cutting teeth are arranged on the cutter disc, and the high-pressure water jet nozzle is arranged between the cutting teeth; the heights of the high-pressure water drive nozzle and the high-pressure water jet nozzle are both smaller 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 arranged on the connecting head, and a high-pressure water drive inlet and a high-pressure water jet inlet are arranged between the bearing mounting platform I and the bearing mounting platform II; in the middle connecting body and the connecting head, 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.

[0010] As a further improvement of the present invention, a driving nozzle water supply channel, a jet cutting nozzle water supply channel and a cavity area are provided in the connecting seat, and a bearing installation area I, a driving nozzle water supply groove, a jet cutting nozzle water supply groove and a bearing installation area II are provided in the cavity area starting from the head of the connecting seat in sequence, the driving nozzle water supply groove is connected to the driving nozzle water supply channel, and the jet cutting nozzle water supply groove is connected to the jet cutting nozzle water supply channel; the bearing installation area I and the bearing installation area II are used to install 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 driving inlet is connected to the driving nozzle water supply groove, and the high-pressure water jet inlet is connected to the jet cutting nozzle water supply groove; bearings are installed in the bearing installation area I and the bearing installation area II, and the high-pressure water jet drill bit generates relative rotation with the flexible drill rod through two bearings.

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

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

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

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

[0015] In a second aspect, the present invention further 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, determining the direction of the hole to be drilled;

[0017] Step S2, drilling a guide borehole of a certain length on the rock wall along a set drilling direction, wherein the length of the guide borehole is less than the length of the directional guide cylinder;

[0018] Step S3, inserting the high-pressure water jet drill bit into the pilot drill hole so that the circular wall surface at the top of the pilot drill hole does not contact the cutter head, and the directional guide drill barrel extends into the pilot drill hole together with the high-pressure water jet drill bit;

[0019] Step S4, turning on the high-pressure pump, the high-pressure water abrasive is ejected from two high-pressure water drive nozzles and four high-pressure water jet nozzles through the high-pressure flexible pipe at the same time, the high-pressure water drive nozzle drives the high-pressure water jet drill bit to rotate, and at the same time, the water jets of the four high-pressure water jet nozzles break the circular wall surface at the top of the guide drill hole;

[0020] Step S5, pushing the high-pressure water jet drilling tool forward, the picks crush the wall surface cut by the water jet, and the crushed water slag flows out of the drill hole from the water guide groove on the directional guide cylinder;

[0021] Step S6, continuously feeding the flexible drill rod into the cut borehole, and continuously advancing the borehole in the set direction through the cutting direction of the high-pressure water jet and the cooperation between the directional guide cylinder and the borehole wall.

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

[0023] Beneficial effects of the present invention:

[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 at the edge of the cutter head, and the water jet direction is clockwise or counterclockwise. With the help of the reaction force generated by the high-pressure water jet and the rock wall, the drill bit and the drill rod are driven to rotate by themselves, eliminating the need for the rotational power provided by the drilling vehicle; four high-pressure water jet nozzles are provided on the cutter head, which are located at different positions of the cutter head. When cutting the rock wall in front, the wall surface can be cut into a hollow rock mass with a certain depth, the hard rock wall is pre-crushed first, and then the hollow rock mass is re-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 slightly deviated from the forward direction by a certain angle, which can further reduce the width of the root of the hollowed-out rock mass, thereby reducing its stability, greatly reducing the cutting resistance of the pick, thereby improving the drilling efficiency, and making the drilling direction move in a predetermined direction;

[0026] (3) The present invention provides a directional guide cylinder on the drilling tool. Since the directional guide cylinder moves forward together with the drill bit, a directional constraint is formed between the directional guide cylinder 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 matching cutting teeth, the resistance encountered in the front is very small. Therefore, the cooperation of the two can effectively ensure that the drilling direction moves in the predetermined direction.

[0027] (4) Since the flexible drill rod of the present invention does not rotate during the drilling process, the friction between it and the borehole wall is greatly reduced, thereby ensuring its service life. At the same time, compared with the rigid drill rod with a fixed length of 1 meter to 2 meters, the flexible drill rod can be set to be longer, such as 50 meters or 100 meters, and there is no need to frequently replace the drill rod, which can greatly improve the efficiency of drilling construction. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

[0033] Figure 5 It is a schematic diagram of the structure of the flexible drill rod;

[0034] Figure 6 It is a schematic diagram of the connection seat structure of the flexible drill rod;

[0035] Figure 7 It is a structural schematic diagram of a directional guide cylinder;

[0036] In the figure, 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 teeth, 12-middle connector, 13-connecting head, 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-driving nozzle water supply channel, 222-jet cutting nozzle water supply channel, 223-bearing installation area I, 224-driving 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 DESCRIPTION

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

[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. Figure 2-Figure 4 As shown, the water jet drill bit 1 includes a cutter disc 11, a middle connector 12 and a connector 13. The cutter disc 11 is threadedly connected to the middle connector 12, and the middle connector 12 is threadedly connected to the connector 13. Two high-pressure water-driven nozzles 110, four high-pressure water jet nozzles 111 and four picks 112 are arranged on the cutter disc 11. The two high-pressure water-driven nozzles 110 are arranged at the edge of the cutter disc 11, and the jet directions thereof are the tangent directions of the outer periphery of the cutter disc 11, and each tangent direction is clockwise or counterclockwise. The four high-pressure water jet nozzles 111 are arranged on the disc surface on the inner side of the cutter disc 11, and the jet directions thereof are in front of the cutter disc 11. The four high-pressure water jet nozzles 111 are distributed at different positions on the cutter disc from the center point. The high-pressure water jet nozzles 111 are located between the two picks 112 , and their height is less than that of the picks 112 , so that the high-pressure water jet nozzles 111 and the high-pressure water drive nozzles 110 can be protected during drilling.

[0039] Two bearing mounting platforms, namely, bearing mounting platform I131 and bearing mounting platform II132, are arranged on the connector 13, and a high-pressure water drive inlet 133 and a high-pressure water jet inlet 1134 are arranged between the two bearing mounting platforms. A water flow channel from the high-pressure water drive inlet 133 to the high-pressure water drive nozzle 110, and a water flow channel from the high-pressure water jet inlet 134 to the high-pressure water jet nozzle 111 are arranged inside the connector 13 and inside the middle connector 12.

[0040] like Figure 3 As shown, there are four high-pressure water jet nozzles 111, which are recorded as 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 disc 11 inward, wherein the jet direction of the high-pressure water jet nozzle I1110 is offset by a certain angle from the edge direction of the cutter disc 11 adjacent to the front direction, and the offset angle is 5-10 degrees; the jet direction of the high-pressure water jet nozzle II1111 is offset by a certain angle from the front to the side away from the jet direction of the high-pressure water jet nozzle I1110, and the offset angle is 5-10 degrees; the jet direction of the high-pressure water jet nozzle III1112 is parallel to the direction of the high-pressure water jet nozzle I1110, and the jet direction of the high-pressure water jet nozzle IV1113 is parallel to the jet direction of the high-pressure water jet nozzle II1111.

[0041] like Figure 5 and Figure 6 As shown, it is a schematic diagram of the structure of the flexible drill rod 2. The flexible drill rod 2 includes two parts, one part is a high-pressure flexible tube 21, and the other part is a connecting seat 22. The connecting seat 2 is used to cooperate with the connecting head 13. The high-pressure flexible tube 21 is a pressure-resistant rubber tube. The connecting seat 22 is provided with a driving nozzle water supply channel 221, a jet cutting nozzle water supply channel 222 and a cavity area. The cavity area is provided with a bearing installation area I223, a driving nozzle water supply groove 224, a jet cutting nozzle water supply groove 225 and a bearing installation area II226 in sequence from the head of the connecting seat 22. The driving nozzle water supply groove 224 is connected to the driving 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 installation area I223 and the bearing installation area II226 are used to install bearings. Specifically, the driving nozzle water supply groove 224 and the jet cutting nozzle water supply groove 225 are both annular grooves.

[0042] In the cavity area, a sealing ring annular groove I227 is provided between the bearing mounting area I223 and the driving nozzle water supply groove 224, a sealing ring annular groove 228 is provided between the driving 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 225 jet cutting nozzle water supply groove and the bearing mounting area II 226. Sealing rings are provided in the sealing ring annular groove I227, the sealing ring annular groove II228, and the sealing ring annular groove III229 to prevent water from entering the bearing mounting area I23 and the bearing mounting area II26, and to isolate the driving nozzle water supply groove 224 from the jet cutting nozzle water supply groove to form two independent water channels.

[0043] The flexible drill rod of the present invention is made of a pressure-resistant rubber tube. Compared with the prior art, its length can be made very long, such as 50 meters or 100 meters, while the traditional rigid drill rod is usually 1-2 meters, and the drill rod needs to be frequently replaced during drilling, and due to the large number of connecting points, water leakage is prone to occur. The flexible drill rod of the present invention has greatly reduced connecting points, thereby reducing water leakage points. At the same time, the flexible drill rod can be stored by a reel, and the space occupied by it is greatly reduced.

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

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

[0046] The working principle of the high-pressure water jet drilling tool of the present invention is:

[0047] High-pressure water enters from the flexible drill pipe 2 and is sprayed out from the high-pressure water-driven nozzle 110. Since the two high-pressure water-driven nozzles 110 are arranged at 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 sprayed in the borehole, their action points are the wall of the borehole. The reaction can make the cutter head 11 together with the middle connector 12 and the connector 13 continuously rotate relative to the flexible drill pipe 2.

[0048] Four high-pressure water jet nozzles are arranged on the surface of the cutter disc 11, and the jet direction is forward, and the forward direction here is the circular wall surface of the borehole in front of it, that is, the jet direction can only act on this circular wall surface, that is, it can be directly forward, or it can be slightly inclined at a certain angle directly forward, but the impact point of the water jet must be on the circular splitting surface. In this embodiment, the four high-pressure water jet nozzles are arranged on the circular surfaces of different radii in the cutter disc 11, that is, each high-pressure water jet nozzle is at a different distance from the center point, and its function is that when the cutter disc 11 rotates, the four high-pressure water jet nozzles can cut four annular grooves, that is, the wall surface of the entire circular borehole is divided into annular grooves adjacent to the annular rock mass, and then the cutting teeth 112 on the cutter disc 11 are used for cutting, and it is very easy to cut the rock mass. In this embodiment, the four high-pressure water jet nozzles are slightly offset to both sides at a certain angle based on the directly forward direction, and the purpose is that the high-pressure water jet nozzle 110 can cut obliquely and cut the root of the annular rock mass into thin pieces, so that the cutting teeth 112 can cut more conveniently.

[0049] When the directional guide cylinder 3 is installed, the threaded end thereof is matched with the external thread on the connecting seat 22. A plurality of circumferentially arranged water guide grooves 31 are provided on its surface, so that water slag can flow out from the water guide grooves 31 toward the direction of the drill hole outlet during water jet cutting.

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

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

[0052] Step S1, determine the direction of the hole to be drilled. Determine the best direction of the hole to be drilled according to the strike, inclination and inclination of the rock formation.

[0053] Step S2, first drill a guide borehole of a certain length on the rock wall along the set drilling direction, and the length of the guide borehole 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 pilot borehole so that the circular wall surface at the top of the pilot borehole does not contact the cutter head 11, and the directional guide drill barrel 3 extends into the pilot borehole together with the high-pressure water jet drill bit 1.

[0055] Step S4, turn on the high-pressure pump, and the high-pressure water abrasive is sprayed out from the two high-pressure water drive nozzles 110 and the four high-pressure water jet nozzles 111 through the high-pressure flexible tube 21 at the same time. The high-pressure water drive nozzle 110 drives the high-pressure water jet drill bit 1 to rotate, and at the same time, the water jets of the four high-pressure water jet nozzles 111 break the circular wall surface at the top of the guide drill hole.

[0056] Step S5, the high-pressure water jet drilling tool is pushed forward, and the pick 112 breaks the wall surface cut by the water jet, and the broken water slag flows out of the drill hole 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, and the borehole is continuously advanced in the set direction through the cutting direction of the high-pressure water jet and the cooperation between the directional guide cylinder 3 and the borehole wall. When encountering hard rock and the drilling speed slows down, the pressure of the high-pressure water abrasive is increased by the high-pressure pump, and the advancement speed of the flexible drill rod 2 is slowed down.

[0058] The present invention can achieve two purposes. One is that the drill bit can run in a straight line without changing direction when encountering hard rock. The other is that the rock mass can be cut quickly to increase the drilling speed. The principle of its ability to move in a straight line is that, on the one hand, the abrasive water material sprayed by the water jet nozzle can cut the front circular wall of the borehole without contact. When encountering hard rock, the direction of the water jet remains unchanged. At most, the speed slows down, which will not affect the direction of drilling. Therefore, there is no resistance to the drill bit leaning to one side or turning in the direction of its advance. On the other hand, by setting a directional guide cylinder 3 to cooperate with the water jet drill bit 1, when the drilling direction is tilted, since the outer diameter of the directional guide cylinder 3 is equivalent to the diameter of the borehole, the directional guide cylinder 3 can correct the drilling direction by cooperating with the borehole.

[0059] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Various changes that can be made within the knowledge scope of technicians in the relevant technical field 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), comprising a cutter disc (11), a middle connector (12) and a connector (13) connected in sequence, wherein at least two high-pressure water drive nozzles (110) and a plurality of high-pressure water jet nozzles (111) are arranged on the cutter disc (11), wherein the high-pressure water drive nozzles (110) are installed at the edge of the cutter disc (11), and the jet direction is the tangent direction of the cutter disc (11), and is either clockwise or counterclockwise; the high-pressure water jet nozzles (111) are distributed at different positions away from the center point of the cutter disc (11), and the jet direction is in front of the cutter disc (11); A flexible drill rod (2) is used to provide high-pressure water for the high-pressure water jet drill bit (1), comprising a high-pressure flexible tube (21) and a connecting seat (22), wherein the front end of the connecting seat (22) is plugged 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) when drilling a hole. The directional guide cylinder (3) is detachably connected to the outside of the connecting seat (22), and its front end is located behind the cutter disc (11).

2. The high-pressure water jet drilling tool according to claim 1, characterized in that: A plurality of cutting teeth (112) are also arranged on the cutter disc (11), and the high-pressure water jet nozzle (111) is arranged between the cutting teeth (112); the heights of the high-pressure water drive nozzle (110) and the high-pressure water jet nozzle (111) are both smaller than the height of the cutting teeth (112).

3. The high-pressure water jet drilling tool according to claim 2, characterized in that: A bearing mounting platform I (131) and a bearing mounting platform II (132) are arranged on the connecting head (13), and a high-pressure water drive inlet (133) and a high-pressure water jet inlet (134) are arranged between the bearing mounting platform I (131) and the bearing mounting platform II (132); a water flow channel from the high-pressure water drive inlet (133) to the high-pressure water drive nozzle (110), and a water flow channel from the high-pressure water jet inlet (134) to the high-pressure water jet nozzle (111) are arranged in the middle connecting body (12) and the connecting head (13).

4. The high-pressure water jet drilling tool according to claim 3, characterized in that: The connection seat (22) is provided with a driving nozzle water supply channel (221), a jet cutting nozzle water supply channel (222) and a cavity area. The cavity area is provided with a bearing installation area I (223), a driving nozzle water supply groove (224), a jet cutting nozzle water supply groove (225) and a bearing installation area II (226) in sequence from the head of the connection seat (22). The driving nozzle water supply groove (224) is connected to the driving 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 installation area I (223) and the bearing installation area II (226) are connected to each other. ) is used to install bearings; when the high-pressure water jet drill bit (1) is connected to the flexible drill rod (2), the connecting head (13) of the high-pressure water jet drill bit (1) is inserted into the cavity area of ​​the connecting 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 installation area I (223) and the bearing installation area II (226), and the high-pressure water jet drill bit (1) generates relative rotation with the flexible drill rod (2) through two bearings.

5. The high-pressure water jet drilling tool according to claim 4, characterized in that: There are four high-pressure water jet nozzles (111), which are denoted 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) from the edge of the cutter disc (11) to the center of the circle, wherein the jet direction of the high-pressure water jet nozzle I (1110) is offset by a certain angle from the edge direction of the cutter disc (11) adjacent to the front direction; the jet direction of the high-pressure water jet nozzle II (1111) is offset by a certain angle from the front direction to the jet direction away from the high-pressure water jet nozzle I (1110); the jet direction of the high-pressure water jet nozzle III (1112) is parallel to the jet direction of the high-pressure water jet nozzle I (1110), and the jet direction of the high-pressure water jet nozzle IV (1113) is parallel to the jet direction of the high-pressure water jet nozzle II (1111).

6. The high-pressure water jet drilling tool according to claim 5, characterized in that: The caliber of the high-pressure water driving nozzle (110) is larger than the caliber of the high-pressure water jet nozzle (111).

7. The high-pressure water jet drilling tool according to claim 1, characterized in that: The directional guide cylinder (3) has a plurality of water guide grooves (31) uniformly distributed in the circumferential direction of the outer portion thereof and extending in the length direction of the cylinder body.

8. The high-pressure water jet drilling tool according to any one of claims 1 to 7, characterized in that: The high-pressure water jet nozzle (111) and the high-pressure water drive nozzle (110) both spray pure high-pressure water or high-pressure water abrasive.

9. A high-pressure water jet drilling method, based on the high-pressure water jet drilling tool according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1, determining the direction of the hole to be drilled; Step S2, first drilling a guide borehole of a certain length on the rock wall along the set drilling direction, wherein the length of the guide borehole is less than the length of the directional guide cylinder (3); Step S3, inserting the high-pressure water jet drill bit (1) into the pilot drill hole so that the circular wall surface at the top of the pilot drill hole does not contact the cutter head (11), and the directional guide drill tube (3) extends into the pilot drill hole together with the high-pressure water jet drill bit (1); Step S4, turning 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 nozzle (110) drives the high-pressure water jet drill bit (1) to rotate, and at the same time, the water jets of the four high-pressure water jet nozzles (111) crush the circular wall surface at the top of the guide drill hole; Step S5, the high-pressure water jet drilling tool is pushed forward, and the cutting teeth (112) crush the wall surface cut by the water jet, and the crushed water slag flows out of the drill hole from the water guide groove (31) on the directional guide cylinder (3); Step S6, continuously feeding the flexible drill rod (2) into the cut borehole, and continuously advancing the borehole in the set direction through the cutting direction of the high-pressure water jet and the cooperation between the directional guide cylinder (3) and the borehole wall.

10. The high-pressure water jet drilling method according to claim 9, characterized in that: In step S6, when encountering hard rock and causing the drilling speed to slow down, the pressure of the high-pressure water abrasive is increased by the high-pressure pump and the advancement speed of the flexible drill rod (2) is slowed down.

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