Hydrodynamic drill bit and device for flushing silt of underground water monitoring well

Abstract

Through hydrodynamic force driving and multifunctional structural design, the core problems that existing monitoring well sludge cleaning equipment depends on external power, the anti-jamming effect is poor, and the operation efficiency is low are solved. Due to the conical spiral blade fan, the inclined jet outlet, the sharp edge and the cambered surface notch structure of the hydrodynamic drill bit, integrated operation of drilling, impurity cutting, blocking prevention and flushing is achieved; the device adapts to various high-pressure fluids and can flexibly cope with different working conditions; the device is compact in structure, easy and convenient to operate and suitable for narrow spaces of various monitoring wells. The technical concept can be further expanded to the directions of design of drill bits with different sizes (adaptive to hoistways with different diameters), optimization of the number of jet outlets (improvement of rotation stability), increase of a fluid heating function (coping with iced sludge in a low-temperature environment) and the like, and has wide application prospects and popularization values.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of monitoring well cleaning equipment, in particular to a fluid power drill bit without external mechanical power, anti-blocking and efficient drilling, and a monitoring well sludge flushing device using the drill bit, which is suitable for sludge and debris cleaning operation of various underground closed or semi-closed shafts such as municipal sewer, industrial drainage well, underground cable well and gas pipeline well. BACKGROUND

[0002] As an important part of urban infrastructure, the monitoring well is prone to accumulate sludge, silt and stone blocks after long-term use, and often entangles with plastic bags, cable residues and other string-like debris, which leads to shaft blockage, poor drainage / ventilation, and even affects the maintenance and safety of underground pipelines.

[0003] The existing monitoring well sludge cleaning equipment has many defects: first, the traditional drill bit relies on external power such as motor and hydraulic motor for driving, which has complex structure and large size, and is difficult to adapt to the narrow operation space of the monitoring well, with poor installation and operation flexibility; second, the string-like debris mixed in the sludge is easy to entangle the drill bit, and the stone blocks are easy to block between the drill bit and the well wall, which leads to equipment stop and even damage; third, the drilling and flushing functions are separated, and the drilling mechanism and flushing mechanism need to be set up separately, which has low operation efficiency, and the resistance is large during drilling, making it difficult to advance; fourth, the driving mode is single, which is difficult to adapt to different conditions of sludge such as viscosity, consolidation and dryness, and the cleaning effect is not good.

[0004] In view of the above deficiencies of the prior art, there is an urgent need for a monitoring well sludge cleaning equipment with compact structure, strong power adaptability, good anti-blocking effect, and simultaneous realization of drilling, cutting and flushing functions, so as to improve the cleaning efficiency and operation stability. SUMMARY

[0005] The present application aims to overcome the defects of the existing monitoring well sludge cleaning equipment, and provides a fluid power driven drill bit and device, which does not need external power supply, realizes the rotation and advancement of the drill bit through high-pressure fluid, simultaneously completes the sludge drilling, string cutting, anti-blocking and flushing operation, adapts to different working conditions, and improves the cleaning efficiency and stability.

[0006] Specifically, the present invention is implemented as follows: a fluid dynamic drill bit for flushing sludge in groundwater monitoring wells, comprising a drill head and a connecting seat, wherein the drill head is a fluid dynamic drill bit, comprising a spiral drill bit (1) and a rotating rod (11), wherein the spiral drill bit (1) is composed of three spiral blades (12) equally divided along the axial direction, which are spirally interleaved in sequence, and the three spiral blades (12) are fixedly installed on the lower end of the rotating rod (11), and have an overall conical structure in which the width of the blades gradually narrows from the tail end to the head end; the tail end of the rotating rod (11) is a hollow rod and extends into the connecting seat (2) and communicates with the interior of the connecting seat (2); each of the three spiral blades (12) has a radially distributed through cavity (13) on the outer edge of its tail end, the through cavity (13) being... 3) The inner end is connected to the rod cavity of the hollow rod, and the injection outlet (14) at the other end is opened on the side wall of the spiral fan (12) and connected to the external space; the connecting seat (2) is rotatably connected to the rotating rod (1) and is used to dock with the fluid delivery pipe (4). The rotating rod (11) is inserted into the connecting seat (2) and prevented from falling out by the limiting part (18) set in the inner section of the rotating rod (11), so that the fluid power drill bit can rotate axially relative to the connecting seat (2) through the rotating rod, and the hollow rod inlet at the tail end of the rotating rod (11) is connected to the inside of the connecting seat (2); the high pressure fluid can be connected to the fluid delivery pipe (4) and enter from the inlet of the hollow rod, and spray out at high speed from the injection outlet (14) through the through cavity (13), forming a reverse thrust to drive the fluid power drill bit to rotate at high speed.

[0007] Furthermore, the connecting seat (2) includes an end cap (21) and a connector (22) both having coaxial shaft holes. The connector (22) includes an internal threaded connection, an inner groove, and an outer groove. The inner groove and the outer groove are respectively used to accommodate the installation of the first bearing ring seat (23) and the second bearing ring seat (24). The depth and size of the inner groove and the outer groove are adapted to the thickness and size of the first bearing ring seat (23) and the second bearing ring seat (24). The axes of the inner groove and the outer groove are on the same axis and coaxial with the through hole. The hollow rod can pass through the shaft hole. The limiting part (18) is fixedly installed on the outer edge of the hollow rod. The diameter of the limiting part (18) is larger than the diameter of the shaft hole.

[0008] Furthermore, the end face of the connector (22) is provided with several screw holes, and the end cap (21) is provided with corresponding mounting holes, which can be installed in the screw holes by bolts passing through the mounting holes, so as to fix the first bearing ring seat (23) and the second bearing ring seat (24); after the end cap (21) and the connector (22) are installed, their outer surface edges are aligned with each other, and the whole has an arc end structure.

[0009] Furthermore, the jet outlet (14) of the auger drill bit (1) is located at the end or side of the auger blade (12). The outlet direction of the jet outlet (14) is perpendicular to the axial direction and is ejected horizontally to provide rotational power; or the outlet direction of the jet outlet (14) forms an upward angle with the horizontal plane, which can provide both tangential rotational power and downward propulsion force.

[0010] Furthermore, the edges of the spiral blade (12) are all gradually narrowed sharp blade edges (15) for spirally cutting off rope-like debris in the monitoring well.

[0011] Furthermore, the bottom edge of the tail end of the spiral blade fan (12) is an inclined edge that slopes upward toward the hollow rod, and the inclined edge is a blade-shaped structure (16).

[0012] Furthermore, the spiral blade fan (12) is integrally cast with the hollow rotating shaft, the through cavity (13) is a drilled structure and the hole is sealed at the opening, and an oblique drill hole is opened on the upper side, the oblique drill hole is connected to the through cavity (13) to serve as the jet outlet (14); the fluid is high-pressure water, high-pressure gas or high-pressure water-gas mixture.

[0013] Furthermore, the outer edge of the root of the spiral blade fan (12) is connected to the hollow rotating shaft in an arc-shaped structure (17); the end cap (21) is in the shape of an arc-shaped small head to reduce the probability of stones getting stuck; the side wall of the connector (22) is provided with mutually axially symmetrically distributed clamping grooves (25).

[0014] In another aspect of the present invention, an apparatus for flushing sludge in underground wells is provided, wherein a connecting seat (2) of a hydrodynamic drill bit is installed with a docking mechanism, the docking mechanism being a cylindrical docking mechanism (3), one end of which is fixedly connected to the connecting seat (2), and the other end of which is connected to a fluid delivery pipe (4), the other end of which is connected to a high-pressure fluid supply source.

[0015] Furthermore, the cylindrical docking mechanism (3) has its own counterweight, and the side wall is provided with mutually axisymmetrically distributed clamping grooves (25); the cylindrical docking mechanism (3) is connected to the fluid delivery pipe (4) through internal and external thread adaptation, so that the high-pressure fluid is transported to the fluid power drill bit through the fluid delivery pipe (4), and ejected from the rotating rod (11), the through cavity (13), and the jet outlet (14).

[0016] The working principle of this invention: This device is based on a composite principle that combines fluid reaction force drive, mechanical rotary cutting disturbance and air bubble sand lifting and sewage discharge. The core is to achieve dual functions through high-pressure fluid (high-pressure gas or high-pressure water-air mixture) injection: first, to generate a reverse thrust to drive the drill bit to rotate; second, to form a large number of air bubbles under the working condition of gas / water-air mixture, and to use the upward rushing action of air bubbles to disturb the silt and sand and transport and discharge it upward. Specifically, high-pressure fluid enters the connecting seat through the fluid delivery pipe, then is pressed into the hollow rod cavity of the rotating rod, and then is ejected at high speed from the injection outlet through the radial passage at the tail end of the spiral blade, driving the spiral drill bit to rotate at high speed. If the direction of the injection outlet is perpendicular to the axis, the reaction force is a tangential force, driving the drill bit to rotate at high speed; if the direction of the injection outlet is at an upward angle to the horizontal plane, the reaction force can be decomposed into a tangential rotational force and a downward propulsive force, so that the drill bit has both rotational power and downward capability. The spiral drill bit adopts three equally divided spiral staggered blades, with an overall conical structure. The edges of the blades are sharp cutting edges, and the bottom edge of the tail end is a cutting edge. When the drill bit rotates, its sharp edges can precisely cut through tangled wires and other debris inside the well, preventing the device from becoming entangled or jammed. Simultaneously, the conical structure and the rotating action of the spiral blades can initially drill, loosen, and agitate the hardened sludge downhole, and also push the sludge upwards with the spiral blades. Upon contact with the fluid at the jet outlet, the sludge is rapidly dispersed into small pieces of mud and sand, which then come into contact with air bubbles and are further agitated and carried upwards. When the high-pressure fluid is high-pressure gas or a water-air mixture, the high-pressure fluid ejected at high speed from the jet outlet will form a large number of dispersed air bubbles in the bottom area of ​​the well. As these bubbles rise, they continuously collide with and compress the surrounding sludge and sand particles, suspending the particles and significantly improving the fluidity of the sludge. The suspended mud and sand particles will adhere to the bubble surface through physical adsorption and surface adhesion. At the same time, the rising bubbles will create an upward airflow, propelling the attached mud and sand bubbles and the surrounding suspended mud and sand particles upwards together. Utilizing the dual effect of "bubble carrier + upwelling traction," sediment can be efficiently carried away from the bottom of the well and ultimately discharged outside the well with the fluid, completing the dredging operation. Even when using high-pressure water, the high-speed water flow can help suspend sediment, and combined with the spiral agitation, achieve initial discharge. The gas / water-gas mixture further enhances the sediment removal efficiency through the bubble effect. When the drill bit rotates, the sharp edges of the blade fan and the beveled edge at the tail end work simultaneously to precisely cut through tangled ropes, fibers, and other debris inside the well, preventing the device from jamming due to debris entanglement. At the same time, the arc-shaped connection structure between the root of the spiral blade fan and the hollow rod can reduce the obstruction and jamming of the drill bit by rocks and protrusions in the well, further improving the operational stability of the device.

[0017] Beneficial technical effects of the present invention:

[0018] (1) High dredging efficiency and stable synergistic effect: The combined effect of rotary cutting and jetting to provide power and fluid disturbance to discharge sludge achieves efficient crushing of sludge. Combined with air bubbles carrying sand and spiral assistance for upward discharge, the efficiency of sludge discharge is greatly improved without the need for electric drive. The spiral fan blade adopts a conical structure with three equally divided spiral staggered distributions. The significance of this design is to expand the contact range with sludge. When rotating, it forms a spiral upward airflow / water flow to help the sludge be discharged. Combined with the combined effect of "rotary cutting + air bubble disturbance", the sludge is efficiently separated and loosened. The sharp edge of the blade and the beveled edge of the tail end can accurately cut off rope-like debris in the well, prevent entanglement and jamming, further ensure the continuity of dredging, and ultimately greatly improve the efficiency of sludge discharge and shorten the operation time.

[0019] (2) Stable and reliable operation, and highly practical.

[0020] The structural design of the spiral fan blade is the core of ensuring stable operation: First, the sharp edges and the beveled edge at the tail end can cut through debris and prevent entanglement, reducing the risk of jamming at the source; Second, the arc-shaped connection structure between the fan blade root and the hollow rod can reduce the jamming of foreign objects such as rocks in the well and improve smooth passage; Combined with the double bearing and limit design, rotational stability is ensured, making the overall structure robust, adaptable to complex downhole environments, and significantly reducing the probability of failure.

[0021] (3) Energy-saving and economical, with practical value

[0022] The fluid reverse propulsion system is self-driven and requires no additional power source, resulting in energy savings and reduced consumption. Its structural design offers significant advantages in ease of use: Firstly, the core components adopt a modular design, with the connecting seat assembled by bolts connecting the end cap and the connector. The fluid power drill bit, docking mechanism, and fluid delivery pipe are connected via threaded adapters, facilitating easy disassembly and assembly. Secondly, it eliminates the need for additional heavy power components such as motors and hydraulic motors, resulting in a compact and lightweight overall structure that is not bulky and easy to transport and carry. Thirdly, the well-diving operation relies on the counterweight assistance of the docking mechanism, requiring no complex controls and adapting to the confined space of monitoring wells, ensuring excellent usability. Simultaneously, it thoroughly cleans without damaging the well wall, ensuring the accuracy of subsequent testing and enhancing the utilization value of the monitoring well. Attached Figure Description

[0023] Figure 1 A three-dimensional view of a spiral drill bit structure for flushing sludge in groundwater monitoring wells using hydrodynamic drilling.

[0024] Figure 2 A three-dimensional view of a auger drill bit with a hydrodynamic drill bit installed, used for flushing sludge in underground wells;

[0025] Figure 3 A schematic diagram of a hydrodynamic drill bit used for flushing sludge in groundwater monitoring wells;

[0026] Figure 4 for Figure 3 Schematic diagram of the BB cross-sectional structure in the middle;

[0027] Figure 5 for Figure 3 A schematic diagram of the AA cross-sectional structure in the diagram;

[0028] Figure 6 An exploded view of the structure of a hydrodynamic drill bit used for flushing sludge in groundwater monitoring wells;

[0029] Figure 7 This is a schematic diagram illustrating the usage of a hydrodynamic drill bit for flushing sludge in groundwater monitoring wells.

[0030] Reference numerals: 1—auger bit, 11—rotating rod, 12—auger blade, 13—through cavity, 14—jet outlet, 15—sharp cutting edge, 16—cutting edge structure, 17—arc surface structure, 18—limiting part;

[0031] 2—Connecting seat, 21—End cap, 22—Matching joint, 23—First bearing ring seat, 24—Second bearing ring seat, 25—Clamping groove;

[0032] 3—Cylindrical docking mechanism;

[0033] 4—Fluid transport pipe. Detailed Implementation

[0034] This embodiment aims to detail the structural assembly process, operation steps, and daily maintenance points of the hydrodynamic drill bit used for sludge flushing in groundwater monitoring wells and the flushing equipment including the device, to ensure that operators can complete the standard operation according to the following instructions.

[0035] Example 1

[0036] First, the hydrodynamic drill bit is assembled. The first step is to assemble the hydrodynamic drill bit with the connecting seat 2. A matching rotating rod 11 and three spiral blades 12 are selected. Since the spiral blades 12 and rotating rod 11 are integrally cast, the sharp edges 15 of the spiral blades 12 and the cutting edge of the tail bevel must be checked before assembly. Simultaneously, the cavity 13 and injection outlet 14 of the hollow rod at the tail end of the rotating rod 11 are checked to ensure there are no obstructions. Preferably, the spiral blades 12 are fixedly connected to the rotating rod 11 by welding.

[0037] The second step is to assemble the connecting seat 2 and install the bearings. First, place the first bearing ring seat 23 into the inner groove of the connector 22, and the second bearing ring seat 24 into the outer groove of the connector 22, ensuring that the two bearing ring seats fit tightly against the groove and that the shaft center is coaxial with the shaft hole of the connector 22. Then, align the hollow rod section at the tail end of the rotating rod 11 towards the connecting seat 2, so that the rotating rod 11 passes through the shaft hole of the end cap 21 of the connecting seat 2. Next, align the end cap 21 with the end face of the connector 22, ensuring that the mounting hole on the end cap 21 is precisely aligned with the screw hole on the end face of the connector 22. Select suitable bolts, pass them through the mounting holes of the end cap 21 and screw them into the screw holes of the connector 22, and gradually tighten the bolts until the outer surface edges of the end cap 21 and the connector 22 are completely aligned. At this point, the end cap 21 and the connector 22 form a complete arc-shaped end structure, completing the assembly of the connecting seat 2. After assembly, check the rotation status of the rotating rod 11 to ensure that the rotating rod 11 can rotate smoothly axially relative to the connecting seat 2. At the same time, the limiting part 18 installed on the end of the rotating rod 11 realizes the anti-disengagement function. The limiting part 18 is a ring design, which is fixedly connected to the rotating rod 11 and its diameter is larger than the diameter of the shaft hole, which can effectively prevent the rotating rod 11 from axially displacing and disengaging during rotation.

[0038] The third step is to assemble the fluid power drill bit and the overall flushing equipment. Connect the assembled fluid power drill bit's connecting seat 2 to the cylindrical docking mechanism 3. During docking, use a special tool pliers to tighten the connecting seat 22 using the groove 25 on its side wall. Then, connect one end of the cylindrical docking mechanism 3 to the connecting seat 2's connecting seat 2, ensuring a tight fit. Next, connect one end of the fluid delivery pipe 4 to the other end of the cylindrical docking mechanism 3, using the internal and external thread adaptation characteristics to tighten it, ensuring no fluid leakage risk at the connection. Finally, connect the other end of the fluid delivery pipe 4 to the high-pressure fluid supply source, completing the assembly of the entire flushing equipment. During assembly, check the unobstructed flow of all connections to ensure smooth delivery of high-pressure fluid. The fluid delivery pipe 4 can be a flexible hose.

[0039] After assembly, the pre-operation inspection phase begins. First, check the tightness of all connections, ensuring bolts are secure and threads are not stripped. Second, check the operation of the high-pressure fluid supply source to ensure a stable output of high-pressure fluid. High-pressure fluid can be high-pressure water, high-pressure gas, or a high-pressure water-gas mixture. Operators can select the appropriate fluid type based on the actual condition of the silt in the monitoring well. For viscous or severely compacted silt, a high-pressure water-gas mixture is preferred; for loose silt with high water content, high-pressure water can be used. Next, check the rotational flexibility of the hydrodynamic drill bit. Manually push the auger blade 12 to ensure it rotates smoothly relative to the connecting seat 2 without jamming. Simultaneously, check the orientation of the injection outlet 14. Determine the outlet direction based on operational requirements. If only rotational power is needed, select an outlet 14 with its outlet direction perpendicular to the axis. If both rotational power and downward propulsion are required, select an outlet 14 with its outlet direction at an upward angle to the horizontal plane.

[0040] During the operation phase, the assembled flushing equipment is first moved to the wellhead of the monitoring well. The equipment is then adjusted so that the hydrodynamic drill bit is facing directly below the wellhead. With the help of the counterweight of the cylindrical docking mechanism 3, the hydrodynamic drill bit is slowly lowered into the monitoring well. The lowering process is carried out at a constant speed to avoid violent collisions between the equipment and the well wall. The lowering is stopped once the hydrodynamic drill bit reaches a suitable position above the silt layer at the bottom of the well.

[0041] The high-pressure fluid supply source is activated, and the high-pressure fluid enters the connecting seat 2 through the fluid delivery pipe 4. It then enters the hollow rod cavity from the hollow rod inlet at the tail end of the rotating rod 11, flows along the through cavity 13 to the injection outlet 14, and is ejected at high speed. With the help of the reverse thrust generated by the fluid injection, the hydrodynamic drill bit is driven to rotate at high speed. If the water accumulation in the well is deep, the oblique injection outlet 14 can be selected. In this case, the drill bit simultaneously obtains tangential rotational power and downward propulsion force, slowly drilling into the silt layer.

[0042] During drilling, the sharp edges 15 of the spiral fan 12 will cut and shred rope-like debris in the well, preventing it from tangling around the drill bit. Simultaneously, the rotating conical spiral fan 12 agitates the silt, causing it to be transported upwards with the fan. Upon contact with the high-pressure fluid ejected from the injection outlet 14, the silt is further broken down into fine sand particles. If high-pressure gas or a high-pressure water-air mixture is used, the ejected fluid forms numerous bubbles at the bottom of the well. As these bubbles rise, they carry the surrounding fluid, creating an upward airflow that suspends the silt particles, causing them to move upwards with the bubbles and ultimately be discharged from the well with the fluid, completing the silt removal operation.

[0043] During the operation, the operator needs to observe the state of the fluid discharged from the wellhead in real time. If the mud and sand content in the discharged fluid is significantly reduced, it can be determined that the sludge at the bottom of the well has been basically cleared. At this time, the high-pressure fluid supply source should be shut off first. After the fluid power drill bit stops rotating, the entire flushing equipment should be slowly lifted out of the monitoring well. During the lifting process, the equipment should be kept stable to avoid collision with the well wall. In addition, due to the arc-shaped connection structure between the blade root and the hollow rod, the probability of jamming by foreign objects such as rocks in the well can be reduced, and the lifting process is smooth and stable. During the lifting process, if there are entangled debris on the side wall, the sharp edge 15 and the beveled edge at the tail end can cut off the debris and prevent entanglement under the action of the lifting force.

[0044] After the operation is completed, the subsequent processing stage begins. First, the flushing equipment is cleaned by rinsing the outer surfaces of the hydrodynamic drill bit, connector 2, docking mechanism, and fluid delivery pipe 4 with clean water to remove residual sludge and debris. Special attention is paid to cleaning the jet outlet 14 and the passage cavity 13 to ensure there are no blockages. Then, the wear and tear of each component is checked, including whether the cutting edge of the spiral fan 12 is worn, whether the bearing rotates smoothly, and whether the sealing of the connection is good. If any component is found to be damaged or severely worn, it should be replaced or repaired in a timely manner.

[0045] During routine maintenance, the hydrodynamic drill bit should be thoroughly inspected regularly, and the through cavity 13 and jet outlet 14 should be cleaned periodically to prevent debris accumulation. The lubrication status of the bearing ring should be checked regularly, and lubricant should be added as needed to ensure smooth rotation. Bolts and threaded connections should be checked regularly, and loose bolts should be tightened promptly to prevent parts from falling off during operation. When storing the equipment, all parts should be cleaned and dried before being placed in a dry, well-ventilated environment to prevent corrosion caused by moisture.

[0046] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A hydrodynamic drill bit for flushing sludge in groundwater monitoring wells, comprising a drill head and a connecting seat (2), characterized in that: The drill head is a hydrodynamic drill head, including a spiral drill bit (1) and a rotating rod (11). The spiral drill bit (1) consists of three spiral blades (12) that are equally divided along the axial direction and are spirally interleaved. The three spiral blades (12) are fixedly installed on the lower end of the rotating rod (11) and have an overall conical structure in which the width of the blades gradually narrows from the tail end to the end end. The tail end of the rotating rod (11) is a hollow rod and extends into the connecting seat (2) and communicates with the interior of the connecting seat (2). The outer edge region of the tail end of each of the three spiral blades (12) is provided with a radially distributed through cavity (13). The inner end of the through cavity (13) is connected to the rod cavity of the hollow rod, and the jet outlet (14) at the other end is opened on the side wall of the spiral blade (12) and communicates with the external space. The connecting seat (2) is rotatably connected to the rotating rod (1) and is used to dock with the fluid delivery pipe (4). The rotating rod (11) passes through the connecting seat (2) and is prevented from coming out by the limiting part (18) set in the inner section of the rotating rod (11). This allows the fluid power drill bit to rotate axially relative to the connecting seat (2) through the rotating rod. The hollow rod inlet at the tail end of the rotating rod (11) is connected to the inside of the connecting seat (2). High-pressure fluid can be connected to the fluid delivery pipe (4) and enter from the inlet of the hollow rod. It is then ejected at high speed from the jet outlet (14) through the through cavity (13), forming a reverse thrust force that drives the fluid power drill bit to rotate at high speed.

2. The hydrodynamic drill bit according to claim 1, characterized in that, The connecting seat (2) includes an end cap (21) and a connector (22) both having coaxial shaft holes. The connector (22) includes an internal threaded connection, an inner groove, and an outer groove. The inner groove and the outer groove are respectively used to accommodate the installation of the first bearing ring seat (23) and the second bearing ring seat (24). The depth and size of the inner groove and the outer groove are adapted to the thickness and size of the first bearing ring seat (23) and the second bearing ring seat (24). The axes of the inner groove and the outer groove are on the same axis and coaxial with the through hole. The hollow rod can pass through the shaft hole. The limiting part (18) is fixedly installed on the outer edge of the hollow rod, and the diameter of the limiting part (18) is larger than the diameter of the shaft hole.

3. The hydrodynamic drill bit according to claim 2, characterized in that, The end face of the connector (22) is provided with several screw holes, and the end cap (21) is provided with corresponding mounting holes. The bolts can be passed through the mounting holes and installed in the screw holes to fix the first bearing ring seat (23) and the second bearing ring seat (24). After installation, the outer surface edges of the end cap (21) and the connector (22) are aligned with each other, and the whole has an arc-shaped end structure.

4. The hydrodynamic drill bit according to claim 1, characterized in that, The jet outlet (14) of the auger drill bit (1) is located at the end or side of the auger blade (12). The outlet direction of the jet outlet (14) is perpendicular to the axial direction and is ejected horizontally to provide rotational power. The outlet direction of the jet outlet (14) forms an upward angle with the horizontal plane, which can provide both tangential rotational power and downward propulsion force.

5. The hydrodynamic drill bit according to claim 1, characterized in that, The edges of the spiral blades (12) are all sharp, gradually narrowing edges (15), used to spin and cut off rope-like debris in the monitoring well.

6. The hydrodynamic drill bit according to claim 1 or 5, characterized in that, The bottom edge of the spiral blade fan (12) is an inclined edge that slopes upward toward the hollow rod, and the inclined edge is a blade-shaped structure (16).

7. The hydrodynamic drill bit according to claim 1, characterized in that, The spiral blade fan (12) is integrally cast with the hollow rotating shaft. The through cavity (13) is a drilled structure with the hole sealed at the opening. An oblique drill hole is opened on the upper side and the oblique drill hole connects to the through cavity (13) to serve as a jet outlet (14). The fluid is high-pressure water, high-pressure gas, or a high-pressure water-gas mixture.

8. The hydrodynamic drill bit according to claim 2, characterized in that, The outer edge of the root of the spiral blade (12) is connected to the hollow rotating shaft in an arc-shaped structure (17); the end cap (21) is in the shape of an arc-shaped small head to reduce the probability of the stone getting stuck. The sidewall of the connector (22) is provided with mutually axisymmetrically distributed clamping grooves (25).

9. A device for flushing sludge from underground wells, characterized in that... The fluid power drill bit as described in any one of claims 1-8 is used to install the connecting seat (2) of the fluid power drill bit with a docking mechanism. The docking mechanism is a cylindrical docking mechanism (3), one end of which is fixedly connected to the connecting seat (2), and the other end of which is connected to the fluid delivery pipe (4). The other end of the fluid delivery pipe (4) is connected to a high-pressure fluid supply source.

10. The device for flushing sludge in underground wells according to claim 9, characterized in that, The cylindrical docking mechanism (3) has its own counterweight and has mutually axisymmetrically distributed clamping grooves (25) on its side wall; the cylindrical docking mechanism (3) and the fluid conveying pipe (4) are connected by internal and external threads, so that the high pressure fluid is conveyed to the fluid power drill bit through the fluid conveying pipe (4) and ejected from the rotating rod (11), the through cavity (13) and the jet outlet (14).

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