Water jet combined drilling device and method thereof

Abstract

The invention provides a water jet combined drilling device and a method thereof.The device comprises a combined drilling tool, a drilling machine body, a pneumatic spiral sand supply system, a low-pressure water supply unit and a high-pressure jet water power unit, the drilling machine body is provided with the combined drilling tool and a pipeline for high-pressure water and abrasive materials to pass through inside a drilling rod, and the low-pressure water passes through the outer side of a drilling bit; the high-pressure water pipeline channel is connected with the high-pressure jet water power unit through a swivel joint; the low-pressure water channel is connected with a low-pressure water supply unit through a swivel joint; the mixed abrasive medium channel is connected with the pneumatic spiral sand supply system through a swivel joint; the pneumatic spiral sand supply system specifically comprises a pressurizing device, a sand tank and a spiral stirring device, the spiral stirring device is arranged in the sand tank, grinding materials in the pneumatic spiral sand supply system are evenly stirred through the spiral stirring device, then the airtight gas tank is pressurized, the grinding materials flow out through the bottom and flow to a jet flow nozzle through a pipeline to be jetted out, the pressure of a supply pipeline is increased, and the grinding materials are evenly stirred. And grinding materials are uniformly mixed, and the cutting effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of underground engineering, and in particular relates to a water jet combined drilling device and a method thereof. Background Art

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

[0003] Drilling equipment generally refers to an operating device that uses a drill bit to work in underground projects, uses mechanical drilling tools to break rocks or other media, and forms and deepens boreholes.

[0004] When encountering rocks with a hardness exceeding the set value, the drilling effect of a simple mechanical drill is significantly poor. Some researchers have proposed adding a jet drill bit to the drilling device to improve the rock breaking effect. However, in actual use, jet cutting still has problems such as limited drilling space, low pressure in the abrasive / jet supply pipeline, low cutting pressure, and uneven abrasive mixing. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes a water jet combined drilling device and method thereof. The abrasive in the present invention is made uniform by a spiral stirring device, and then pressurized in a closed gas tank so that the abrasive flows out through the bottom and flows to the jet nozzle through a pipeline to be ejected, thereby increasing the supply pipeline pressure and effectively ensuring uniform mixing of the abrasive.

[0006] According to some embodiments, the present invention adopts the following technical solutions:

[0007] A water jet combined drilling device comprises a combined drilling tool, a drilling rig body, a pneumatic screw sand supply system, a low-pressure water supply unit and a high-pressure jet water power unit, wherein:

[0008] The drilling rig body is provided with a combined drilling tool, and the drilling rig body is used to control the movement and operation of the combined drilling tool;

[0009] The combined drilling tool comprises a mechanical drill bit, a drill rod and a water jet nozzle, wherein the mechanical drill bit is connected to the drill rod, the water jet nozzle is arranged on the end face of the mechanical drill bit, and a plurality of high-pressure jet channels, abrasive mixing channels and low-pressure water outlet channels are arranged in the water jet nozzle; a high-pressure water pipeline channel, a mixed abrasive medium channel and a low-pressure water channel are correspondingly arranged in the drill rod, and the channels / passages are respectively connected correspondingly, and the abrasive mixing channel is connected to the high-pressure jet channel; a plurality of water jet outlets are arranged on the end face of the water jet nozzle, and a plurality of low-pressure water outlets are arranged on the side / edge of the drill bit, and the water jet outlets are connected to the corresponding high-pressure jet channels; the low-pressure water outlets are connected to the corresponding low-pressure water outlet channels;

[0010] The high-pressure water pipeline channel is connected to the high-pressure jet water power unit via a swivel joint;

[0011] The low-pressure water channel is connected to the low-pressure water supply unit via a swivel joint;

[0012] The mixed abrasive medium channel is connected to the pneumatic spiral sand supply system via a swivel joint;

[0013] The pneumatic spiral sand supply system includes a pressurizing device, a sand tank and a spiral stirring device. The spiral stirring device is arranged in the sand tank for uniformly mixing the abrasive in the sand tank. The pressurizing device is connected to the sand tank for providing pressure to the sand tank so that the abrasive is pressurized and sent out from the sand outlet pipeline to flow into the mixed abrasive medium channel.

[0014] As an optional implementation, the sand outlet pipeline is arranged at the bottom of the sand tank, an air intake pipeline is arranged at the upper part of the sand tank, and the air intake pipeline and the pressurizing device are connected through an air supply pipeline.

[0015] As an optional embodiment, the drill rod includes a plurality of detachably connected drill rods, and both ends of each drill rod are respectively provided with a fixed male head and a fixed female head, and the fixed male heads and fixed female heads of adjacent drill rods are adapted to each other.

[0016] As a further embodiment, a plurality of sensors are arranged on the surface of the drill rod connected to the drill bit, and the sensors are used to monitor the temperature of the drilling space, detect the composition of the cave in front, monitor the pressure of the water in the cave, monitor the toxic and harmful gases in the current drilling space, and detect the torque and reaction force of the drilling rig motor.

[0017] As a further embodiment, a transition drill rod is provided at the drill rod near the swivel joint, one end of the transition drill rod is connected to the swivel joint, and the other end is connected to the drill rod. The transition drill rod includes a wear-resistant fixing part, a wear-resistant connecting sleeve and a connecting part which are connected in sequence, the wear-resistant fixing part and the swivel joint are detachably connected, and the connecting part and the drill rod are detachably connected.

[0018] As an optional embodiment, the high-pressure water pipeline channel and / or the mixed abrasive medium channel inside the drill pipe near the swivel joint is connected with a bypass valve to divide the corresponding channel into two or three for corresponding connection with corresponding channels / passages of other parts.

[0019] As an optional embodiment, the water jet nozzle is provided with two parallel high-pressure jet channels and two parallel abrasive mixing channels, and the abrasive mixing channels are respectively connected to a high-pressure jet channel through a transition pipeline;

[0020] Two high-pressure jet channels are symmetrically arranged in the water jet nozzle, and two abrasive mixing channels are symmetrically arranged in the water jet nozzle, and the abrasive mixing channels and the high-pressure jet channels are evenly distributed;

[0021] The transition pipeline is arranged obliquely with respect to the direction of the high-pressure jet channel / abrasive mixing channel.

[0022] As an optional embodiment, there are two low-pressure water outlets, which are symmetrically arranged on the sides of the drill bit. The low-pressure water outlet passages include two. The drill bit is provided with matching grooves. The low-pressure water outlet passages are accommodated in the corresponding grooves, and each low-pressure water outlet passage is connected to the corresponding low-pressure water outlet.

[0023] The present invention arranges pipelines for high-pressure water and abrasive inside the drill rod. After packaging, low-pressure water flows through the remaining space in the drill rod, thereby optimizing the space design and improving the space utilization rate.

[0024] As an optional embodiment, the swivel joint includes a rotating end and a fixed end, the rotating end is sleeved at the center of the fixed end, and the two are connected by a flange;

[0025] The fixed end is provided with a mixed abrasive transmission channel and a low-pressure water inlet channel, one end of the low-pressure water inlet channel is connected to the low-pressure water channel inside the drill rod of the combined drilling tool, and the other end is connected to the low-pressure water supply unit;

[0026] One end of the mixed abrasive transmission channel is connected to the pneumatic spiral sand supply system, a filter membrane is provided at the end of the mixed abrasive transmission channel, and the other end is connected to the mixed abrasive medium channel;

[0027] The rotating end is connected to the drill rod of the combined drilling tool, and a high-pressure water passage is provided inside. One end of the high-pressure water passage is connected to the high-pressure water pipeline channel, and the other end is connected to the high-pressure jet water power unit.

[0028] The working method based on the above device comprises the following steps:

[0029] Transport the drilling device to the designated location where drilling is required and connect the various components;

[0030] Assemble the combined drilling tool and connect the drilling device and the combined drilling tool;

[0031] Turn on the pneumatic screw sand supply system to mix the abrasive;

[0032] Adjust the drilling device to make the combined drilling tool at a suitable drilling angle and start the combined drilling tool;

[0033] Provide high-pressure water jet, and according to the air flow disturbance when the high-pressure water jet is ejected, form negative pressure, suck in the mixed abrasive, and provide it to the combined drilling tool, forming a mixed cutting state of abrasive and water jet;

[0034] When the supply distance is greater than the set length, the motor of the pneumatic spiral sand supply system is started to release the mixed abrasive medium after stirring and mixing to the rotating transmission joint, so as to realize the active sand supply of the mixed abrasive at a long distance;

[0035] During the above operation, low-pressure water is provided to the low-pressure water channel of the combined drilling tool regularly or irregularly, flows into the low-pressure water outlet passage, and is discharged from the low-pressure water outlet to achieve slag removal.

[0036] As an optional implementation, the mathematical model of the relationship between the transmission distance and other parameters is: L = η*ρ*P*S;

[0037] Among them, L is the distance that the mixed medium needs to be transmitted, η is the unknown coefficient, ρ is the density of the medium, P is the pump pressure provided, and S is the cross-sectional area of ​​the pipeline.

[0038] As an optional implementation, during the drilling process, the strength of the rock is calculated based on the force of the drill rod rotating motor and the drilling thrust of the drilling rig thrust cylinder. The specific mathematical model of rock strength is: P = η*N*F; where η is the coefficient; N is the forward thrust of the cylinder; F is the motor torque;

[0039] Determine the integrity of the rock ahead based on the uniformity of the force.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] The spiral stirring device of the present invention makes the abrasive material uniform, and by pressurizing the closed gas tank, pure sand (abrasive material) flows out through the bottom, flows through the pipeline to the nozzle for ejection; the supply pipeline pressure is increased, and the abrasive material is effectively mixed uniformly, which helps to improve the cutting effect.

[0042] The present invention provides a quick-disassembly transition drill rod on the drill rod, which can facilitate the disassembly and assembly of the drill rod and prevent damage to the swivel joint caused by disassembly. The high-pressure water pipeline channel, the mixed abrasive medium channel and / or the low-pressure water channel inside the drill rod near the swivel joint are connected with a split valve to divide the corresponding channels into two, and the pipeline layout is reasonable, which is convenient for practical application.

[0043] The present invention provides a combined drilling tool, in which the water jet nozzle is installed in the hollow part inside the drill bit, and does not need to occupy the space of the original drill bit. The drill bit only needs to open the water outlet holes for high-pressure jet and low-pressure slag removal liquid, and the other structures are not changed, which does not affect the structural strength and structural stability of the drill bit. The slag removal port is set on the side, not in the center, and the rock slag is discharged from the side of the drill bit as the drill bit rotates.

[0044] The present invention cleverly utilizes the arrangement of three-dimensional space to achieve the integration of high-pressure water jets and mixed abrasive media in a small-diameter nozzle, and the integration of low-pressure and large-flow slag removal liquid. The water jet nozzle achieves efficient use of space based on the specific internal space of the drill bit, solving one of the integration difficulties of actual engineering water jet drilling rigs.

[0045] The present invention can realize the rapid connection of drill rods and the transmission of high and low pressure water in the hole; it can also realize the temperature monitoring of the deep drilling space, the component monitoring of the cave ahead, the pressure monitoring of the water in the current cave, and the monitoring of toxic and harmful gases in the current drilling space through the signal returned by the sensor on the drill rod.

[0046] The present invention obtains real-time data by monitoring the torque on the sensor and the reaction force on the drilling rig motor, and can monitor the rock integrity and rock strength. By analyzing the torque of the sensor and the thrust of the servo motor, if the force is uniform, it means that the rock integrity is high; if the force is uneven, it means that the rock integrity is poor.

[0047] The present invention adds a filter membrane beside the hole side of the rotating shaft for transmitting the mixed abrasive medium, which can block the abrasive in the mixed medium from passing through and reduce the damage caused by the abrasive particles in the mixed medium to the high-pressure sealing ring and the like.

[0048] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0050] Figure 1 is an overall schematic diagram of a water jet combined drilling device according to an embodiment;

[0051] Figure 2 is a schematic diagram of a pneumatic spiral sand supply system of an embodiment;

[0052] Figure 3 is a schematic diagram of a transition drill rod structure of an embodiment;

[0053] Figure 4 The present invention is a schematic diagram of the structure of a water jet water and sand transmission pipeline inside a drill pipe according to an embodiment;

[0054] Figure 5 is a schematic diagram of the structure of a water jet nozzle according to an embodiment;

[0055] Figure 6 The figure is a simulated entity diagram of a water jet nozzle structure of an embodiment.

[0056] Among them, 100, water jet nozzle, 200, drill rod, 300, pneumatic screw sand supply system, 400, high-pressure jet water power unit;

[0057] 101. Drill bit;

[0058] 201. high-pressure pipe, 202. branch valve, 203. high-pressure water pipe, 205. abrasive pipeline, 206. structure of abrasive pipeline after being divided into two, 211. wear-resistant fixing part, 212. wear-resistant connecting sleeve, 213. connecting part, 214. drill pipe;

[0059] 301. air supply pneumatic, 302. air inlet pipeline, 303. sand adding port, 304. sand tank, 305. spiral stirring device, 306. sand road outlet, 307. sand outlet pipeline. DETAILED DESCRIPTION

[0060] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0061] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0062] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0063] In the absence of conflict, the embodiments in this application and the features in the embodiments may be combined with each other.

[0064] Embodiment 1

[0065] A water jet combined drilling device, such as Figure 1 As shown, it includes a combined drilling tool, a drilling rig body, a pneumatic screw sand supply system 300, a low-pressure water supply unit and a high-pressure jet water power unit 400, wherein:

[0066] The drilling rig body is provided with a combined drilling tool, and the drilling rig body is used to control the movement and operation of the combined drilling tool;

[0067] The combined drilling tool, such as Figure 5As shown, it includes a mechanical drill bit, a drill rod 200 and a water jet nozzle 100, the mechanical drill bit is connected to the drill rod 200, the water jet nozzle 100 is arranged on the end face of the mechanical drill bit, and a plurality of high-pressure jet channels, abrasive mixing channels and low-pressure water outlet channels are arranged in the water jet nozzle 100; the drill rod 200 is correspondingly provided with a high-pressure water pipeline channel, a mixed abrasive medium channel and a low-pressure water channel, which are respectively connected to each channel / channel, and the abrasive mixing channel is connected to the high-pressure jet channel; a plurality of water jet outlets are arranged on the end face of the water jet nozzle 100, and a plurality of low-pressure water outlets are arranged on the outer side of the end face, and the water jet outlets are connected to the corresponding high-pressure jet channels; the low-pressure water outlets are connected to the corresponding low-pressure water outlet channels;

[0068] The high-pressure water pipeline channel is connected to the high-pressure jet water power unit 400 through a swivel joint;

[0069] The low-pressure water channel is connected to the low-pressure water supply unit via a swivel joint;

[0070] The mixed abrasive medium channel is connected to the pneumatic screw sand supply system 300 via a swivel joint;

[0071] The pneumatic screw sand supply system 300, as Figure 3 As shown, it includes a pressurizing device, a sand tank and a spiral stirring device. The spiral stirring device is arranged in the sand tank for uniformly mixing the abrasive in the sand tank. The pressurizing device is connected to the sand tank for providing pressure to the sand tank so that the abrasive is pressurized and sent out from the sand outlet pipeline to flow into the mixed abrasive medium channel.

[0072] In this embodiment, the sand outlet pipeline is arranged at the bottom of the sand tank, an air intake pipeline is arranged at the upper part of the sand tank, and the air intake pipeline and the pressurizing device are connected through an air supply pipeline.

[0073] In this embodiment, the drill rod 200 includes a plurality of detachably connected drill rods 200 , and both ends of each drill rod 200 are respectively provided with a fixed male head and a fixed female head, and the fixed male heads and fixed female heads of adjacent drill rods 200 are adapted to each other.

[0074] In some implementations, drill rods are quickly connected to each other in two ways. First, when connecting drill rods, the male and female heads for positioning and providing torque inside the drill rod are connected relative to each other. There is an ultra-high pressure hard steel pipe line and a mixed medium abrasive pipe inside to seal the overpressure water and abrasive medium; the remaining space in the drill rod is filled with low pressure water.

[0075] Through the above method, the transmission of high-pressure water in the hole is realized. The internal high-pressure pipeline and abrasive pipeline are integrated on the drill rod. When the drill rod is positioned and the male and female heads that provide torque resistance are connected, the internal pipelines are also connected; secondly, after the connection is completed, the high-strength fixing buckle at the connection of the drill rod is clamped to clamp the drill rod for fast connection. The above scheme can realize the fast connection between drill rods and internal high and low pressure pipelines, and realize ultra-long and ultra-fast drilling.

[0076] In some embodiments, a plurality of sensors are provided on the surface of the drill rod 200 connected to the drill bit, and the sensors are used to monitor the temperature of the drilling space, detect the composition of the cave ahead, monitor the water pressure in the cave, monitor the toxic and harmful gases in the current drilling space, and detect the torque and reaction force of the drilling rig motor.

[0077] like Figure 3 As shown, a transition drill rod is provided at the drill rod 200 near the swivel joint, one end of the transition drill rod is connected to the swivel joint, and the other end is connected to the drill rod. The transition drill rod includes a wear-resistant fixing member 211, a wear-resistant connecting sleeve 212 and a connecting member 213 which are connected in sequence. The wear-resistant fixing member 211 and the swivel joint are detachably connected, and the connecting member 213 and the drill rod are detachably connected. Since the possibility of being easily damaged by disassembling the rotating center back and forth during the pipeline connection may occur, a wear-resistant sleeve is added. The wear-resistant sleeve can quickly disassemble and assemble the drill rod. The connecting member of the internal pipeline of the drill rod is also there, which can facilitate the rapid loading and unloading and later maintenance of the high-pressure water and abrasive pipelines inside the drill rod.

[0078] In this embodiment, the high-pressure water pipeline channel and / or the mixed abrasive medium channel provided at the drill rod near the swivel joint is connected with a diverter valve to divide the corresponding channel into two or three.

[0079] like Figure 4 As shown, the high-pressure pipe 201 (i.e., the abbreviation of the high-pressure water pipeline channel) can be divided into two or three channels through a split valve 202 to form at least two high-pressure water pipes 203. The abrasive pipeline 205 (the abbreviation of the mixed abrasive medium channel) can also be divided into two pipelines through a split valve to form a structure 206 after the abrasive pipeline is divided into two, so as to be connected to the corresponding channels / passages of other parts. The pipeline is highly integrated, the pipeline is divided into multiple parts, and the pipeline is cleverly arranged according to needs.

[0080] Of course, in other embodiments, the branch valve can be replaced by other devices, such as a three-way valve.

[0081] In this embodiment, a cavity is provided inside the drill bit, a water jet nozzle 100 is provided in the cavity, a plurality of through holes are provided at the center of the end face of the drill bit to match the water jet nozzle 100, two parallel high-pressure jet channels and two parallel abrasive mixing channels are provided inside the water jet nozzle 100, and the abrasive mixing channels are respectively connected to a high-pressure jet channel through a transition pipeline;

[0082] Two high-pressure jet channels are symmetrically arranged in the water jet nozzle 100, and two abrasive mixing channels are symmetrically arranged in the water jet nozzle 100, and the abrasive mixing channel and the high-pressure jet channel are 90 degrees apart;

[0083] The transition pipeline is arranged obliquely with respect to the direction of the high-pressure jet channel / abrasive mixing channel.

[0084] In this embodiment, two injection ports are provided on the end surface of the water jet nozzle 100, and the injection ports are respectively connected to a high-pressure jet channel; a plurality of low-pressure water outlets are provided on the side of the drill bit, which are respectively provided on different sides, such as Figure 6 As shown, the red part in the figure is the low-pressure water outlet, which is not set at the center but at the side.

[0085] Two low-pressure water outlet passages are also provided on the drill bit or in the drill rod 200, arranged side by side, and each low-pressure water outlet passage is connected to a corresponding low-pressure water outlet. Figure 5 As shown, a groove may be provided on the drill bit, and the low-pressure pipeline is provided in the groove.

[0086] like Figure 2 As shown, the sand tank 304 of the pneumatic spiral sand supply system 300 of this embodiment is provided with a sand adding port 303 at the top, and the upper part is connected to the air supply pneumatic 301 through the air inlet pipeline 302. A spiral stirring device 305 is also provided inside the sand tank 304. A sand path outlet 306 is provided at the bottom of the sand tank 304, and the sand path outlet 306 is connected to the sand outlet pipeline 307. When working, the abrasive is first added from the sand adding port 303, and then the sand tank is sealed and pressurized inward, and air is added from the top. The air pressure of the entire sealed gas tank rises, and the abrasive is pressed out from the bottom. However, due to the unevenness of the sand output, the spiral stirring device 305 is added, and its purpose is to evenly mix the abrasive in the gas tank, and then pressurize and evenly send it out.

[0087] The swivel joint of this embodiment includes a rotating end and a fixed end, wherein the rotating end is sleeved at the center of the fixed end, and the two are connected by a flange;

[0088] The fixed end is provided with a mixed abrasive transmission channel and a low-pressure water inlet channel, one end of the low-pressure water inlet channel is connected to the low-pressure water channel inside the drill rod 200 of the combined drilling tool, and the other end is connected to the low-pressure water supply unit;

[0089] One end of the mixed abrasive transmission channel is connected to the pneumatic spiral sand supply system 300, a filter membrane is provided at the end of the mixed abrasive transmission channel, and the other end is connected to the mixed abrasive medium channel;

[0090] The rotating end is connected to the drill rod of the combined drilling tool, and a high-pressure water passage is opened inside. One end of the high-pressure water passage is connected to the high-pressure water pipeline channel, and the other end is connected to the high-pressure jet water power unit 400.

[0091] Embodiment 2

[0092] The working method of the drilling device according to the first embodiment includes the following steps:

[0093] Transport the drilling device to the designated location where drilling is required and connect the various components;

[0094] Assemble the combined drilling tool and connect the drilling device and the combined drilling tool;

[0095] Turn on the pneumatic screw sand supply system to mix the abrasive;

[0096] Adjust the drilling device to make the combined drilling tool at a suitable drilling angle and start the combined drilling tool;

[0097] Provide high-pressure water jet, and according to the air flow disturbance when the high-pressure water jet is ejected, form negative pressure, suck in the mixed abrasive, and provide it to the combined drilling tool, forming a mixed cutting state of abrasive and water jet;

[0098] When the supply distance is greater than the set length, the motor of the pneumatic spiral sand supply system is started to release the mixed abrasive medium after stirring and mixing to the rotating transmission joint, so as to realize the active sand supply of the mixed abrasive at a long distance;

[0099] During the above operation, low-pressure water is provided to the low-pressure water channel of the combined drilling tool regularly or irregularly, flows into the low-pressure water outlet passage, and is discharged from the low-pressure water outlet to achieve slag removal.

[0100] The mathematical model of the relationship between transmission distance and other parameters is: L = η*ρ*P*S;

[0101] Among them, L is the distance that the mixed medium needs to be transmitted, η is the unknown coefficient, ρ is the density of the medium, P is the pump pressure provided, and S is the cross-sectional area of ​​the pipeline.

[0102] During the drilling process, the strength of the rock is calculated based on the force of the drill rod rotating motor and the drilling thrust of the drilling rig thrust cylinder. The specific mathematical model of rock strength is: P = η*N*F; where η is the coefficient; N is the forward thrust of the cylinder; F is the motor torque;

[0103] Determine the integrity of the rock ahead based on the uniformity of the force.

[0104] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principle of the present invention without creative labor shall be included in the protection scope of the present invention.

Claims

1. A water jet combined drilling device, characterized in that: It includes a combined drilling tool, a drilling rig body, a pneumatic screw sand supply system, a low-pressure water supply unit and a high-pressure jet water power unit, wherein: The drilling rig body is provided with a combined drilling tool, and the drilling rig body is used to control the movement and operation of the combined drilling tool; The combined drilling tool comprises a mechanical drill bit, a drill rod and a water jet nozzle, wherein the mechanical drill bit is connected to the drill rod, the water jet nozzle is arranged on the end face of the mechanical drill bit, and a plurality of high-pressure jet channels, abrasive mixing channels and low-pressure water outlet channels are arranged in the water jet nozzle; a high-pressure water pipeline channel, a mixed abrasive medium channel and a low-pressure water channel are correspondingly arranged in the drill rod, and the channels / passages are respectively connected correspondingly, and the abrasive mixing channel is connected to the high-pressure jet channel; a plurality of water jet outlets are arranged on the end face of the water jet nozzle, and a plurality of low-pressure water outlets are arranged on the side face of the drill bit, and the water jet outlets are connected to the corresponding high-pressure jet channels; the low-pressure water outlets are connected to the corresponding low-pressure water outlet channels; The high-pressure water pipeline channel is connected to the high-pressure jet water power unit via a swivel joint; The low-pressure water channel is connected to the low-pressure water supply unit via a swivel joint; The mixed abrasive medium channel is connected to the pneumatic spiral sand supply system via a swivel joint; The pneumatic spiral sand supply system includes a pressurizing device, a sand tank and a spiral stirring device. The spiral stirring device is arranged in the sand tank for uniformly mixing the abrasive in the sand tank. The pressurizing device is connected to the sand tank for providing pressure to the sand tank so that the abrasive is pressurized and sent out from the sand outlet pipeline to flow into the mixed abrasive medium channel.

2. A water jet combined drilling device as claimed in claim 1, characterized in that: The sand outlet pipeline is arranged at the bottom of the sand tank, an air intake pipeline is arranged at the upper part of the sand tank, and the air intake pipeline and the pressurizing device are connected through an air supply pipeline.

3. A water jet combined drilling device as claimed in claim 1, characterized in that: The drill rod comprises a plurality of detachably connected drill rods, and a fixed male head and a fixed female head are respectively arranged at both ends of each drill rod, and the fixed male heads and fixed female heads of adjacent drill rods are adapted to each other.

4. A water jet combined drilling device as claimed in claim 2, characterized in that, The surface of the drill rod connected to the drill bit is provided with a plurality of sensors, which are used to monitor the temperature of the drilling space, detect the composition of the cave ahead, monitor the pressure of the water in the cave, monitor the toxic and harmful gases in the current drilling space, and detect the torque and reaction force of the drilling rig motor.

5. The water jet combined drilling device according to claim 1, characterized in that: A transition drill rod is provided near the drill rod of the swivel joint, one end of the transition drill rod is connected to the swivel joint, and the other end is connected to the drill rod, the transition drill rod comprises a wear-resistant fixing part, a wear-resistant connecting sleeve and a connecting part which are connected in sequence, the wear-resistant fixing part and the swivel joint are detachably connected, and the connecting part and the drill rod are detachably connected; Alternatively, the high-pressure water pipeline channel and / or the mixed abrasive medium channel inside the drill pipe near the swivel joint is connected with a split valve to divide the corresponding channel into two or three for corresponding connection with the corresponding channels / passages of other parts.

6. The water jet combined drilling device according to claim 1, characterized in that: The water jet nozzle is provided with two parallel high-pressure jet channels and two parallel abrasive mixing channels, and each of the abrasive mixing channels is connected to a high-pressure jet channel through a transition pipeline; Two high-pressure jet channels are symmetrically arranged in the water jet nozzle, and two abrasive mixing channels are symmetrically arranged in the water jet nozzle, and the abrasive mixing channel and the high-pressure jet channel are symmetrically arranged in the water jet nozzle, and the difference between the abrasive mixing channel and the high-pressure jet channel is 90 degrees; The transition pipeline is arranged obliquely with respect to the direction of the high-pressure jet channel / abrasive mixing channel.

7. The water jet combined drilling device according to claim 1, characterized in that: There are two low-pressure water outlets, which are arranged on the side / edge of the drill bit. The low-pressure water outlet passages include two. The drill bit is provided with matching grooves. The low-pressure water outlet passages are accommodated in the corresponding grooves. Each low-pressure water outlet passage is connected to the corresponding low-pressure water outlet.

8. The water jet combined drilling device according to claim 1, characterized in that: The swivel joint comprises a rotating end and a fixed end, the rotating end is sleeved at the center of the fixed end, and the two are connected by a flange; The fixed end is provided with a mixed abrasive transmission channel and a low-pressure water inlet channel, one end of the low-pressure water inlet channel is connected to the low-pressure water channel inside the drill rod of the combined drilling tool, and the other end is connected to the low-pressure water supply unit; One end of the mixed abrasive transmission channel is connected to the pneumatic spiral sand supply system, a filter membrane is provided at the end of the mixed abrasive transmission channel, and the other end is connected to the mixed abrasive medium channel; The rotating end is connected to the drill rod of the combined drilling tool, and a high-pressure water passage is provided inside. One end of the high-pressure water passage is connected to the high-pressure water pipeline channel, and the other end is connected to the high-pressure jet water power unit.

9. A working method based on the device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Transport the drilling device to the designated location where drilling is required and connect the various components; Assemble the combined drilling tool and connect the drilling device and the combined drilling tool; Turn on the pneumatic screw sand supply system to mix the abrasive; Adjust the drilling device to make the combined drilling tool at a suitable drilling angle and start the combined drilling tool; Provide high-pressure water jet, and according to the air flow disturbance when the high-pressure water jet is ejected, form negative pressure, suck in the mixed abrasive, and provide it to the combined drilling tool, forming a mixed cutting state of abrasive and water jet; When the supply distance is greater than the set length, the motor of the pneumatic spiral sand supply system is started to release the mixed abrasive medium after stirring and mixing to the rotating transmission joint, so as to realize the active sand supply of the mixed abrasive at a long distance; During the above operation, low-pressure water is provided to the low-pressure water channel of the combined drilling tool regularly or irregularly, flows into the low-pressure water outlet passage, and is discharged from the low-pressure water outlet to achieve slag removal.

10. The working method according to claim 9, characterized in that: The mathematical model of the relationship between transmission distance and other parameters is: L = η*ρ*P*S; Where L is the distance that the mixed medium needs to be transmitted, η is the coefficient to be determined, ρ is the density of the medium, P is the pump pressure provided, and S is the cross-sectional area of ​​the pipeline; Or, during the drilling process, the strength of the rock is calculated based on the force of the drill rod rotating motor and the drilling thrust of the drilling rig thrust cylinder. The specific mathematical model of rock strength is: P = η*N*F; where η is the coefficient; N is the forward thrust of the cylinder; F is the motor torque; Determine the integrity of the rock ahead based on the uniformity of the force.

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