An ultrahigh pressure water jet mechanical combined drilling rig and method

Abstract

The application provides a super-high pressure water jet mechanical combined drilling machine and method, the drilling machine comprises a drill rod, the front end of the drill rod is provided with a water jet mechanical combined drilling tool, a plurality of water jet pipelines are arranged in the water jet mechanical combined drilling tool, and cutting teeth are arranged on the front and back surfaces, the inside of the drill rod contains a high pressure water jet pipeline, one end of the high pressure water jet pipeline of the drill rod is connected to the water jet pipeline of the water jet mechanical combined drilling tool, and the other end is connected to a super-high pressure water jet pump group through a rotary joint; a plurality of slag discharge channels are also arranged in the inside of the drill rod, are connected to the water jet hole of the water jet mechanical combined drilling tool, and high pressure water jets or high pressure gases are introduced into the slag discharge channels through the reverse rotation of the water jet mechanical combined drilling tool, so that the blockage channels are discharged, and the hole collapse problem is relieved. The application can realize super-long distance drilling and rock breaking, and can realize real-time monitoring of rock strength and integrity, grasping of drilling position and drill tool offset condition and relieving of the hole collapse problem.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of drilling and rock breaking, and particularly relates to a super-high pressure water jet mechanical combined drilling machine and method. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] Advanced drilling technology is a method of exploring the foundation soil before the construction of a building foundation by drilling. This technology mainly relies on drilling equipment to explore the underground soil structure, lithology, and groundwater conditions in detail to obtain geological information. Through this method, engineers can evaluate the bearing capacity and stability of the foundation to provide important basis for subsequent engineering design and construction.

[0004] During actual drilling, the phenomenon of "hole collapse" is often seen. Hole collapse refers to the sudden rise of water (mud) in the well hole casing during drilling, followed by a sharp drop and the emergence of bubbles, a significant increase in slag output without footage, and a significant increase in drilling load.

[0005] Some researchers have proposed using a combined drilling machine to solve this problem. For example, the "super-high pressure rotary abrasive water jet drilling machine" with the authorization announcement number CN105239928B proposes a dynamic seal plus static seal to solve the problem of short service life of the rotary sealing device of the super-high pressure water jet drilling machine. The "high pressure water jet drilling-expanding-cutting multifunctional drilling tool and its use method" with the application publication number CN117167009A discloses a multifunctional drilling tool that uses a function conversion slide sleeve and elastic elements to achieve low-pressure water drilling and high-pressure water cutting. The "self-moving water jet drilling machine" with the application publication number CN105840100A discloses a water jet drilling machine with a tracked self-propelled mechanism. However, the above-mentioned technologies do not solve the problem of long-distance drilling and rock breaking, and cannot monitor rock strength and integrity. The practical application of super-high pressure water jet drilling machines in engineering is still hindered. SUMMARY

[0006] To solve the above problems, the present application proposes a super-high pressure water jet mechanical combined drilling machine and method. The present application can achieve long-distance drilling and rock breaking, and can monitor rock strength and integrity in real time, and can master the drilling position and drilling tool offset situation.

[0007] According to some embodiments, the present application adopts the following technical solutions:

[0008] A super-high pressure water jet mechanical combined drilling machine, comprising a drilling device, an adjusting device, a lifting device, a walking device, and a guiding device, wherein:

[0009] The lifting device is arranged on the walking device, and the lifting device comprises a stand column;

[0010] The guiding device comprises a feeding frame and a centralizer, and the feeding frame is arranged on the stand column and is adjustable in angle through an adjusting device;

[0011] The drilling device comprises a drill rod, a driving device and a water jet mechanical combined drilling tool, the drill rod is arranged on the feeding frame, the driving device is used for driving the drill rod to move, the front end of the drill rod is provided with the water jet mechanical combined drilling tool, the inside of the drill rod contains a high-pressure water jet pipeline, one end of the high-pressure water jet pipeline of the drill rod is connected to a water jet structure of the water jet mechanical combined drilling tool, and the other end is connected to an ultra-high-pressure water jet pump group through a rotary joint.

[0012] As an alternative embodiment, the water jet mechanical combined drilling tool comprises cutting teeth and a drilling tool casing, a plurality of groups of cutting teeth are distributed on the front and rear of the drilling tool in a circumferential direction, forming two sets of drill tooth structures, and the two sets of drill tooth structures are distributed in an anticlockwise direction and a clockwise direction respectively.

[0013] As an alternative embodiment, an arc-shaped sensor is arranged at the edge of the drilling tool between adjacent two groups of drill tooth structures.

[0014] As an alternative embodiment, a plurality of water jet structures are arranged inside the water jet mechanical combined drilling tool, the water jet structures are arranged between adjacent two groups of drill tooth structures, and the water jet structures do not overlap or block the drill tooth structures.

[0015] As an alternative embodiment, the water jet structure comprises a water jet injection hole, a water jet nozzle is arranged in the water jet injection hole, the distance between each water jet structure and the center point of the drilling tool is different, and each water jet structure is distributed on a circle with a different radius.

[0016] A wireless control switch is arranged in the water jet injection hole, and the wireless control switch can be manually selected to be turned on or turned off according to actual working conditions.

[0017] As an alternative embodiment, the drill rod is multi-sectioned, the sections are connected through threads, and a tapered joint surface is arranged at the connection part.

[0018] As an alternative embodiment, the drill rod is a hollow structure or is internally provided with a plurality of slag discharge channels.

[0019] The driving device is a bidirectional driving mechanism.

[0020] When the hole collapse occurs, the water jet mechanical combined drilling tool reverses, the cutting teeth behind the water jet mechanical combined drilling tool loosens the stuck drilling tool, and the high-pressure water jet or high-pressure gas is introduced into the discharge channel, and is output from the water jet structure of the water jet mechanical combined drilling tool. Because the ultra-high pressure water jet has broken the rock before the hole collapse, the mechanical drilling tool further grinds and breaks the rock block to improve the liquidity, so that the blockage can be discharged from the gap between the outer surface of the drill pipe and the rock formation, and the hole collapse problem is alleviated.

[0021] As an alternative embodiment, the drill pipe and the swivel joint are connected by threads.

[0022] As an alternative embodiment, the swivel joint comprises a swivel joint front end, a bearing, a water pipe, a gasket, a seal and a swivel joint rear end, the swivel joint front end is connected with the swivel joint rear end by threads, the seal, the gasket, the water pipe and the bearing are sequentially arranged in the hole cavity between the swivel joint front end and the swivel joint rear end, the outer diameter of the water pipe has a protrusion, and the protrusion is matched with the gasket and the bearing.

[0023] As an alternative embodiment, the lifting device further comprises a lifting oil cylinder, which is used to drive the rotating mechanism and the feeding frame to move up and down along the column, so as to automatically adjust the height of the drill pipe / drilling tool according to the height of the drilling position;

[0024] The adjusting device is an angle adjusting device, which is installed on the column through a shaft sleeve.

[0025] As an alternative embodiment, the feeding frame comprises a frame mechanism, a moving slide and a sliding block movably arranged on the moving slide, the drilling device is arranged on the sliding block and used to drive the water jet mechanical combined drilling tool to feed forward and retreat backward along the feeding frame, and the centralizer is fixed at the front end of the feeding frame and used to clamp and centralize the water jet mechanical combined drilling tool.

[0026] As an alternative embodiment, the swivel joint is connected to the driving device, the driving device comprises a servo oil cylinder and an oil pressure sensor, the servo oil cylinder is used to drive the drilling tool to move, and the oil pressure sensor is used to measure the oil pressure in the two cavities of the servo oil cylinder.

[0027] Based on the working method of the ultra-high pressure water jet mechanical combined drilling rig, the method comprises the following steps:

[0028] The walking device is started, and the ultra-high pressure water jet mechanical combined drilling rig is moved to the front of the target drilling position;

[0029] The walking device is stopped, and the lifting device is moved, so that the water jet mechanical combined drilling tool is moved to the same height of the target drilling position;

[0030] Controlling the adjusting device to make the water jet mechanical combined drilling tool align the target drilling position at a set angle;

[0031] Adjusting the guiding device to fine-tune the distance between the water jet mechanical combined drilling tool and the target drilling position to be within a predetermined distance;

[0032] Starting the water jet mechanical combined drilling tool to make the drill bit mechanism and the water jet structure break rock individually or jointly.

[0033] When the drilling tool is deviated, the current drilling position and the deviation are detected by the arc-shaped sensor, the wireless control switch is controlled according to the current drilling position and the deviation, the water jet nozzle in the opposite direction of the deviation is opened, the hard rock environment is broken, and the drilling tool and the drill pipe are returned to the correct advancing direction by using the reaction force.

[0034] After the current length of the drill pipe is excavated, the drill pipe connection is unscrewed, the driving device is moved backward, the new drill pipe is loaded, the length of the whole drill pipe is extended, and the drill pipe quick connection is realized.

[0035] Further, according to the test data, a drilling speed data model is constructed:

[0036] H1=Vs λ1 *P λ2 *d λ3 *F λ4

[0037] Wherein, Vs is the speed of the drilling machine, P is the pump pressure of the pump group, d is the nozzle diameter, F is the drilling thrust, λi is the undetermined coefficient, and H1 is the drilling speed.

[0038] Compared with the prior art, the beneficial effects of the present application are:

[0039] 1. The water jet mechanical combined drilling tool is connected with the drill pipe, and the drill pipes can be detachably connected, so that the drill pipe and the drilling tool of different specifications can be quickly switched, the drill pipe can be continuously connected, long-distance and rapid drilling can be realized, and the engineering implementation efficiency is improved.

[0040] 2. The oil pressure sensor is used to detect the drilling tool torque, thrust and other data, the problem that the traditional force sensor is connected with the rotary drilling tool at the front end is solved, the sensor is prevented from being polluted by rock slag and scale, the safety and the convenience of maintenance of the construction are greatly improved, the drilling machine has the ability of sensing while drilling, the rock strength and integrity are monitored in real time, the drilling position and the deviation of the drilling tool are mastered, and the drilling precision is improved.

[0041] 3、The application can combine with the advanced detection technology, analyzes the rock stratum distribution in advance, adopts the ultra-high pressure water jet to form the crack network, and then adopts the ultra-high pressure water jet mechanical combined drilling, and relieves the hole collapse phenomenon through the residue discharge channel, greatly improves the reliability and efficiency of the engineering implementation.

[0042] In order to make the above-mentioned purpose, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0043] The drawings accompanying the specification of the present application form a part of the present application, the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application.

[0044] Figure 1 It is a perspective structural schematic diagram of the ultra-high pressure water jet mechanical combined drilling machine of an embodiment;

[0045] Figure 2 It is a front view of the ultra-high pressure water jet mechanical combined drilling machine of an embodiment;

[0046] Figure 3 It is an axial sectional view of the drilling device of an embodiment;

[0047] Figure 4 It is a schematic diagram of the water jet mechanical combined drilling tool of an embodiment;

[0048] Figure 5 It is a schematic diagram of the drill pipe structure of an embodiment;

[0049] Figure 6 It is an axial sectional view of the rotary joint of an embodiment;

[0050] 1, drilling device, 11, water jet mechanical combined drilling tool, 12, drill pipe, 13, rotary joint, 14, driving device, 111, cutting tooth, 112, drilling tool casing, 113, water jet structure, 121, high-pressure water jet pipeline, 122, residue discharge channel, 131, water pipe, 132, front end of rotary joint, 133, bearing, 134, gasket, 135, sealing element, 136, rear end of rotary joint;

[0051] 2, adjusting device, 21, rotating mechanism, 22, adjusting control mechanism;

[0052] 3, lifting device, 31, stand column, 32, lifting oil cylinder;

[0053] 4, traveling device;

[0054] 5, guiding device, 51, feeding frame, 52, centralizer, 53, support frame;

[0055] 6. The super-high pressure water jet pump set. DETAILED DESCRIPTION

[0056] The application will be further described below in connection with the drawings and examples.

[0057] It should be noted that the following detailed description is illustrative only, and is intended to provide further description in order to provide a thorough understanding of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0058] It is also important to note that the terms "including", "comprising", and / or "having" as used herein are specifically intended to be open-ended and also to mean including, comprising, and / or having other components, in addition to the listed components.

[0059] The embodiments in the application and the features in the embodiments can be combined with each other without conflict.

[0060] A super-high pressure water jet mechanical combined drilling rig comprises a drilling device 1, an adjusting device 2, a lifting device 3, a walking device 4, a guiding device 5, and a super-high pressure water jet pump set 6.

[0061] In some embodiments of the application, as shown in Figure 3 the drilling device 1 comprises a water jet mechanical combined drilling tool 11, a drill pipe 12, a rotary joint 13, and a driving device 14, the water jet mechanical combined drilling tool 11 is arranged at the front end of the drill pipe 12, the rear end of the drill pipe 12 is threadedly connected to the rotary joint 13, and the rotary joint 13 is connected to the driving device 14.

[0062] In the embodiment, the water jet mechanical combined drilling tool 11 comprises cutting teeth 111 and a drilling tool casing 112, as shown in Figure 4 the front and rear of the water jet mechanical combined drilling tool 11 are circumferentially distributed with several groups of cutting teeth 111, forming two sets of drill tooth structures, and the two sets of drill tooth structures are distributed in an anticlockwise direction and a clockwise direction respectively, the water jet mechanical combined drilling tool 11 is a multi-wing PDC composite drilling tool structure, and the cutting teeth of each wing are in a streamlined tooth distribution form.

[0063] The water jet mechanical combined drilling tool 11 is internally provided with a plurality of water jet structures 113, which are arranged between two adjacent groups of drill tooth structures and do not overlap or block the drill tooth structures. The water jet structures are internally provided with nozzles, which are distributed on circles with different radii, and spray different trajectories, which are uniformly distributed in the circle of the diameter of the drilling tool. The water jet structures 113 have two functions. One is to output high-pressure water jet to break rocks. In the process of rotation of the drilling tool, the high-pressure water jet is sprayed outward at the same time, so that a network of cracks is formed on the surface of the rock, and the strength and integrity of the rock are reduced. The water jet spraying hole is internally provided with a wireless control switch, which can be manually selected to be turned on or turned off according to the actual working condition. The other is to output high-pressure water jet or high-pressure gas to clean rock debris and slurry.

[0064] In this embodiment, an arc-shaped sensor is arranged at the edge of the drilling tool between two adjacent groups of drill tooth structures, which is used to detect the current drilling position and bias of the drilling tool.

[0065] As shown in Figure 5 The drill pipe 12 is a quick connecting drill pipe, and each section of the drill pipe 12 is connected through a pipe thread. The front section of the drill pipe 12 and the rear section of the drill pipe 12 are sealed through a conical joint surface. The drill pipe 12 internally contains a high-pressure water jet pipeline 121. One end of the high-pressure water jet pipeline 121 is connected to the water jet structure 113 of the water jet mechanical combined drilling tool, and the other end is connected to a super-high-pressure water jet pump group through the rotary joint. A plurality of rock debris discharge channels 122 are also arranged in the drill pipe 12. In this embodiment, three 120° equidistributed fan-shaped rock debris discharge channels are arranged.

[0066] In some embodiments, the diameter of the drill pipe is smaller than the diameter of the drill bit. During the drilling process of the drilling machine, high-pressure water is input from the fan-shaped hollow position of the drill pipe 12, and high-pressure water jet is sprayed from the water jet structure 113 of the drilling tool, so that rock debris and the like are discharged from the gap between the outer side of the drill pipe and the rock formation.

[0067] When hole collapse occurs and blocks the spray hole or the drilling tool is stuck, the water jet mechanical combined drilling tool 11 is reversed, the cutting teeth 111 behind the water jet mechanical combined drilling tool 11 loosen the stuck drilling tool, and high-pressure water jet or high-pressure gas is input into the rock debris discharge channel. The output from the water jet structure 113 of the water jet mechanical combined drilling tool is because the super-high-pressure water jet has broken the rock before the hole collapse, the mechanical drilling tool further grinds and breaks the rock block to improve the flowability, so that the blockage can be discharged from the gap between the outer surface of the drill pipe 12 and the rock formation, and the problem of hole collapse is alleviated.

[0068] The rear end of the drill pipe 12 is connected to the rotary joint 13 through a thread, as shown in Figure 6As shown, the swivel joint 13 includes a swivel joint front end 132, a bearing 133, a water pipe 131, a gasket 134, a sealing element 135 and a swivel joint rear end 136, the swivel joint front end 132 is connected with the swivel joint rear end 136 through threads, and the sealing element 135, the gasket 134, the water pipe 131 and the bearing 133 are sequentially arranged in a hole cavity between the swivel joint front end 132 and the swivel joint rear end 136.

[0069] In this embodiment, the water pipe 131 has a protrusion on an outer diameter, the protrusion is combined with the gasket 134 and the bearing 133.

[0070] In some embodiments, the bearing 133 includes a thrust bearing and a deep groove ball bearing, the swivel joint 13 is connected to the driving device 14; the driving device 14 includes a servo oil cylinder and an oil pressure sensor, a displacement sensor, an arc sensor and the like.

[0071] The oil pressure sensor solves the problem of connecting the traditional force sensor with the rotary drilling tool at the front end, avoids the pollution of the sensor by rock slag and water scale, improves the drilling precision, monitors the advancing force in real time, thereby monitors the rock strength and integrity, and greatly improves the safety of construction and the convenience of maintenance.

[0072] In some embodiments, the adjusting device 2 is arranged to change the relative inclined position of the water jet mechanical combined drilling tool, and includes a rotating mechanism 21 and an adjusting control mechanism 22, the rotating mechanism 21 can rotate and move, the adjusting control mechanism 22 is used to control the rotating and moving and is fixed at a set angle.

[0073] The rotating mechanism 21 can be an existing mechanism capable of rotating at an angle, such as a flange, a rotating platform and the like, which will not be described here.

[0074] In some embodiments, the lifting device 3 is automatically adjusted according to the height of the drilling position, and includes a column 31 and a lifting oil cylinder 32, the column 31 is provided with a shaft sleeve to install the rotating mechanism 21, and the lifting oil cylinder 32 drives the rotating mechanism 21 to move along the column 31.

[0075] In some embodiments, the guide device 5 is limitedly matched with the water jet mechanical combined drilling tool 11, is installed on the rotating mechanism 21, and includes a feeding frame 51, a centralizer 52 and a support frame 53, the feeding frame 51 includes a frame mechanism, a moving slide rail and a sliding block, the sliding block can move along the moving slide rail, the support frame 53 is installed on the sliding block, and the drilling device 1 is installed on the support frame 53. The feeding frame 51 limits the trajectory of the water jet mechanical combined drilling tool 11 feeding forward and retreating backward along the feeding frame 51; the centralizer 52 is fixed at the front end of the feeding frame 51 and is used to clampingly support the water jet mechanical combined drilling tool 11.

[0076] In this embodiment, the guide device 5 can shorten the cantilever length of the water jet mechanical combined drilling tool 11, the cantilever length is positively correlated with the vibration amplitude, the vibration of the water jet mechanical combined drilling tool 11 in the drilling process is further reduced through the guide device 5, and the deviation of the drilling direction is weakened, the engineering construction precision is improved, and the construction speed and efficiency are improved.

[0077] In some embodiments, the walking device 4 is a base of the drilling machine, and the lifting device 3 is installed on the base. The walking device 4 includes a base, wheels, and a wheel driving device, which can all be of existing technology.

[0078] Of course, in some embodiments, the walking device 4 can also use a universal wheel type moving mechanism or a track type walking mechanism. Details are not described here.

[0079] The position and angle of the water jet mechanical combined drilling tool 11 in space can be changed through the lifting device 3, the walking device 4, the guide device 5, and the adjusting device 2, full-range and multi-angle continuous drilling can be realized, the drilling state and posture of the drilling tool can be adjusted at any time according to the different hardness of different depth rock layers, and a depth of about 200 m can be reached.

[0080] In some embodiments of the present application, the super-high pressure water jet pump group 6 provides super-high pressure water for the water jet mechanical combined drilling machine, such as Figures 1 to 2 As shown in the figure, only the water outlet pipe of the super-high pressure water jet pump group is marked.

[0081] Embodiment two

[0082] A working method based on the super-high pressure water jet mechanical combined drilling machine provided in embodiment one, including the following steps:

[0083] Start the walking device, and move the super-high pressure water jet mechanical combined drilling machine to the front of the target drilling position;

[0084] Stop the walking device, and move the lifting device, so that the water jet mechanical combined drilling tool moves to the same height of the target drilling position;

[0085] Control the adjusting device, so that the water jet mechanical combined drilling tool is aligned with the target drilling position at a set angle;

[0086] Adjust the guide device, fine-tune the distance between the water jet mechanical combined drilling tool and the target drilling position, so that it is within a predetermined distance;

[0087] Start the water jet mechanical combined drilling tool, so that the drill bit mechanism and the water jet structure break rock alone or jointly.

[0088] When the drilling tool is offset, the current drilling position and offset condition detected by the arc-shaped sensor are used to open the water jet nozzle in the opposite direction of the offset condition to break hard rock environment, and the reaction force is used to return the drilling tool and drill pipe to the correct forward direction.

[0089] After the current length of the drill pipe is excavated, the drill pipe connection is unscrewed, the driving device is moved backward, the new drill pipe is loaded, the overall drill pipe length is extended, and the drill pipe rapid connection is realized.

[0090] Further, according to the test data, a drilling speed data model is constructed:

[0091] H1=Vs λ1 *P λ2 *d λ3 *F λ4

[0092] Wherein, Vs is the speed of the drilling machine, P is the pump pressure of the pump group, d is the nozzle diameter, F is the drilling thrust, λi is the undetermined coefficient, and H1 is the drilling speed.

[0093] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made by those skilled in the art without creative labor within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A working method of a super-high pressure water jet mechanical combined drilling rig, characterized in that, The method comprises the following steps: starting the walking device to move the super-high pressure water jet mechanical combined drilling rig to the front of the target drilling position; stopping the walking device and moving the lifting device to move the water jet mechanical combined drilling tool to the same height of the target drilling position; controlling the adjusting device to align the water jet mechanical combined drilling tool to the target drilling position at a set angle; adjusting the guiding device to fine-tune the distance between the water jet mechanical combined drilling tool and the target drilling position to within a predetermined distance; starting the water jet mechanical combined drilling tool to break rock with the tooth mechanism and the water jet structure alone or jointly; when the drilling tool is deviated, the current drilling position and the deviation are detected by the arc sensor, the water jet nozzle in the opposite direction of the deviation is opened, hard rock environment is broken, and the drilling tool and the drill pipe are returned to the correct advancing direction by using the reaction force; after the current length of the drill pipe is excavated, the drill pipe connection is unscrewed, the driving device is moved backward, a new drill pipe is loaded, the length of the overall drill pipe is extended, and the drill pipe is quickly connected. The super-high pressure water jet mechanical combined drilling rig comprises a drilling device, an adjusting device, a lifting device, a walking device and a guiding device.

2. The method of operating a combined water jet and mechanical drill for drilling a well according to claim 1, wherein, The lifting device is arranged on the walking device, and the lifting device comprises a stand column and a support frame movably arranged on the stand column. The guiding device comprises a feeding frame, a centralizer and the support frame, and the feeding frame is arranged on the stand column and is angle-adjustable by the adjusting device. The drilling device comprises a drill pipe, a driving device and a water jet mechanical combined drilling tool, the drill pipe is arranged on the support frame, the centralizer is arranged at the front of the drill pipe and connected to the drill pipe and the feeding frame, the driving device is used to drive the drill pipe to move, the front end of the drill pipe is provided with the water jet mechanical combined drilling tool, the inside of the drill pipe contains a high-pressure water jet pipeline, one end of the high-pressure water jet pipeline is connected to a water jet structure of the water jet mechanical combined drilling tool, and the other end is connected to a super-high pressure water jet pump group through a swivel joint.

3. The method of operating a combined water jet and mechanical drill for drilling a well according to claim 1, wherein, The drill pipe is in a hollow structure or is provided with a plurality of slag discharge channels to pass in high-pressure water jet or high-pressure gas for slag discharge. The drill pipe is in multiple sections, the sections are connected through threads, and the connection part is provided with a tapered joint surface. The driving device is a bidirectional driving mechanism.

4. The method of operating a combined water jet and mechanical drill for drilling a well according to claim 1, wherein, The water jet mechanical combined drilling tool comprises a tooth and a tool casing, the front and rear surfaces of the tool casing are circumferentially provided with a plurality of groups of tooth structures, the tooth structures and the water jet structures are arranged at intervals, the inside of the tool casing is provided with a plurality of water jet structures, the water jet structures are arranged between adjacent two groups of tooth structures and do not overlap or block the tooth mechanism. Adjacent two groups of tooth structures are provided with an arc sensor at the edge of the tool casing.

5. The method of operating a combined water jet and mechanical drill for drilling a well according to claim 1, wherein, The water jet structure comprises a water jet injection hole, the water jet injection hole is provided with a water jet nozzle, the distances of the water jet structures from the center point of the tool casing are different, and the water jet structures are distributed on circles with different radii. The water jet injection hole is provided with a wireless control switch, which can be manually selected to be opened or closed according to actual working conditions.

6. The method of operating a combined mechanical and water jet drill for ultra-high pressure water jet drilling according to claim 2, wherein, The rotary joint is connected to the driving device; the driving device comprises a servo oil cylinder for driving the drilling tool to move and an oil pressure sensor for measuring the oil pressure in the two cavities of the servo oil cylinder.

7. The method of operating a combined water jet and mechanical drill for drilling a well according to claim 2, wherein, The rotary joint comprises a rotary joint front end, a bearing, a water pipe, a gasket, a sealing element and a rotary joint rear end, the rotary joint front end is threadedly connected to the rotary joint rear end, the sealing element, the gasket, the water pipe and the bearing are sequentially arranged in the hole cavity between the rotary joint front end and the rotary joint rear end, the outer diameter of the water pipe has a protrusion, and the protrusion is matched with the gasket and the bearing.

8. The method of operating a combined water jet and mechanical drill for drilling a well according to claim 1, wherein, The lifting device further comprises a lifting oil cylinder for driving the support frame to move up and down along the stand column to autonomously adjust the height of the drill rod / drilling tool according to the height of the drilling position. The adjusting device is an angle adjusting device and is mounted on the stand column through a shaft sleeve.

9. The method of operating a combined water jet and mechanical drill for drilling a well according to claim 2, wherein, The feeding frame comprises a frame mechanism, a moving slide and a sliding block movably arranged on the moving slide, the drilling device is arranged on the sliding block and is used to drive the water jet mechanical combined drilling tool to feed forward and retreat backward along the feeding frame, and the centralizer is fixed to the front end of the feeding frame and is used to clamp and centralize the water jet mechanical combined drilling tool.

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