A drilling and percussion integrated coal seam drilling device and system

Abstract

This utility model discloses an integrated drilling, punching, and protection coal seam drilling device and system. The device includes a drill rod, a drill bit, a base body, and a valve body. The drill rod has a first channel extending axially and open at both ends. The drill bit has a second channel extending axially and open at both ends. The base body includes a seat body with a straight third channel open at both ends. The two ends of the third channel are respectively connected to the outlet end of the first channel and the inlet end of the second channel. The beneficial effects of this utility model are: it integrates drilling, punching, and screen protection functions, eliminating the need to lift the drill after drilling to complete the punching operation. After punching, the screen can be directly lowered into the drill rod, effectively solving the problems of high risk of hole collapse and cumbersome operation caused by soft coal seams and operational fracturing. It significantly improves the continuity and stability of drilling operations in soft coal seams and increases the efficiency of punching and screen protection.

Description

Technical Field

[0001] This utility model relates to the field of drilling and permeability enhancement technology for underground gas extraction in coal seams, and in particular to an integrated drilling, flushing and protection coal seam drilling device and system. Background Technology

[0002] Soft coal seams face significant technical challenges in gas control and coalbed methane development. The core issues lie in the low strength of the coal seam itself, the development of joints and fractures, and the poor stability of the immediate roof and floor. This leads to frequent collapses and diameter reductions during drilling. Simultaneously, the insufficient natural permeability of the coal seam severely restricts gas extraction efficiency. The unique geological conditions of these coal seams make traditional gas extraction technologies difficult to adapt, making borehole stability maintenance and coal seam permeability improvement critical issues that urgently need to be addressed.

[0003] Hydraulic perforation technology exhibits distinct advantages and disadvantages when addressing the challenges of soft coal seams. Its advantages lie in the creation of cavities by impacting the coal seam with high-pressure water jets, effectively expanding the exposed area and inducing fracture network development, thereby improving permeability. Furthermore, the technology is simple in principle, easy to operate, has a significant permeability-enhancing effect, and low construction costs. Verified in multiple mining areas, it can multiply the effective drainage radius of gas boreholes, playing a positive role in improving gas drainage in soft, low-permeability coal seams. However, its disadvantages are equally prominent. Limited by the structural design of the drilling tools and hydraulic perforation equipment, current technology requires drilling to be completed and the drill string to be removed before perforation can be performed within the formed borehole. It cannot be implemented directly after drilling without removing the drill string. Additionally, after perforation, the perforation equipment must be removed before a screen is lowered into the borehole using an open-hole method. This operation not only increases the risk of borehole collapse but also reduces the efficiency of perforation and screen protection, hindering the full realization of the advantages of hydraulic perforation technology and negatively impacting gas drainage.

[0004] Given the challenges of managing soft coal seams and the limitations of existing technologies, there is a clear practical necessity to develop coal seam drilling equipment and supporting processes that enable integrated drilling, drilling, and protection operations. This type of technology can specifically address the inefficiencies and borehole collapse risks associated with current operations, such as drill bit lifting and equipment retrieval, thereby better adapting to the geological characteristics of soft coal seams and ensuring effective gas drainage. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose an integrated drilling, punching and protection coal seam drilling device and system. This solves the technical problems in the prior art where, after drilling in soft coal seams, the drill bit must be removed before punching, and after punching, the punching device must be removed before the screen pipe is lowered, which increases the risk of borehole collapse and reduces the efficiency of punching and screen pipe protection.

[0006] To achieve the above technical objectives, the present invention provides an integrated drilling, percussion, and support coal seam drilling device, comprising:

[0007] A drill pipe having a first channel extending along its axial direction and open at both ends;

[0008] A drill bit having a second channel extending along its axial direction and open at both ends;

[0009] A seat body includes a seat body having a straight third channel with openings at both ends. The two ends of the third channel are respectively connected to the outlet end of the first channel and the inlet end of the second channel. The seat body has a plurality of water spray nozzles that are all connected to the third channel and extend along the width direction of the third channel. The water spray nozzles are close to the first channel.

[0010] A valve body, disposed within the third channel and close to the second channel, includes a valve plate, a fastener, and a first elastic element. The fastener connects the seat body and one side of the valve plate. The fastener has a fixed state in which it is fastened to the seat body to allow the valve plate to cut off the third channel, and a rotational state in which it can rotate relative to the seat body to change the angle between the valve plate and the third channel. When the water flow pressure upstream of the valve plate is higher than a first preset value, the fastener is in a rotating state. The first elastic element connects the seat body and the valve plate so that the surface of the valve plate is in contact with the inner wall of the third channel.

[0011] Furthermore, the seat body is provided with multiple flow passages, each of which extends along the length of the third channel. The two ends of each flow passage are located on the upstream and downstream sides of the valve body, respectively, and are connected to the third channel. When the water flow pressure on the upstream side of the valve plate is lower than the second preset value, the fastener is in a fixed state, the valve plate cuts off the third channel, and the water flow on the upstream side of the valve plate enters the downstream side of the valve plate along each of the flow passages and enters the second channel.

[0012] Furthermore, the seat body is provided with a plurality of flushing holes, each of which extends along the length of the third channel and is located on the downstream side of the valve plate. One end of each flushing hole is connected to each of the flow paths, and the other end of each flushing hole faces the valve plate and is connected to the third channel.

[0013] Furthermore, the fastener is a pin, with an external thread on the outer wall of one end of the pin. The seat has an installation channel that is orthogonal to and connected to the third channel. An internal thread is provided on the inner wall of one end of the installation channel. The pin passes through the installation channel, and the smooth section of the pin is rotatably connected to the smooth section of the installation channel. The external thread of the pin is screwed into the internal thread of the installation channel. When the water pressure upstream of the valve plate is higher than a first preset value, the water flow can push the valve plate to rotate downstream, so that the surface of the valve plate is against the inner wall of the third channel, and the external thread of the pin is separated from the internal thread of the installation channel.

[0014] Furthermore, the seat body is provided with a receiving groove, the opening of the receiving groove is connected to the third channel. When the water flow pressure on the upstream side of the valve plate is higher than the first preset value, the water flow can push the valve plate to rotate in the downstream direction so that the valve plate enters the receiving groove.

[0015] Furthermore, it also includes a converter, which is disposed in the third channel and close to the first channel. The converter includes a piston and a second elastic element. The piston is slidably connected to the inner wall of the third channel. The piston has a water flow path extending axially and open at both ends. The second elastic element connects the seat and the piston and is used to apply a force to the piston opposite to the direction of water flow, so that the piston blocks each of the spray nozzles. When the water flow pressure upstream of the piston is higher than a second preset value, the water flow can push the piston to move downstream, so that the piston moves away from each of the spray nozzles and blocks the inlet end of each of the flow paths.

[0016] Furthermore, a slope is formed on the upstream side of the piston, and the angle between the slope and the inner wall of the third channel is an acute angle.

[0017] Furthermore, the seat also includes a stop ring, which is fixed in the third channel and located between the valve plate and the inlet end of the flow passage. The stop ring is used to abut against the downstream side of the piston to limit the maximum distance the piston can move in the downstream direction.

[0018] Furthermore, the base also includes multiple nozzles, each nozzle being embedded in a corresponding water outlet, and the inlet end of each nozzle being connected to the third channel.

[0019] On the other hand, this utility model also provides an integrated drilling, flushing and protection coal seam drilling device, including the above-mentioned integrated drilling, flushing and protection coal seam drilling device, a support unit and a water supply unit. The support unit is connected to the drill rod and is used to support the drill rod. The water supply unit is connected to the inlet end of the first channel and is used to supply water into the first channel and monitor the pressure of the water flow.

[0020] Compared with the prior art, the beneficial effects of this utility model include: During use, the drill rod drives the base and drill bit to rotate for drilling. When cavity creation is required, water is supplied to the first channel, and the water pressure is lower than a first preset value. At this time, the fasteners are fixed, the valve plate cuts off the third channel, and water is sprayed out along each nozzle to create a cavity. After drilling and cavity creation are completed, the water pressure is increased to the first preset value. At this time, the fasteners are rotating, and the water flow pushes the valve plate to rotate downstream, causing the valve plate surface to press against the inner wall of the third channel. The third channel is then open, stopping the flow to the first channel. Water is supplied within the channel. The screen pipe assembly, consisting of the hanger and screen pipe connected in sequence, is lowered into the first channel. When the screen pipe assembly moves out of the second channel, the hanger opens and connects with the borehole wall, completing the positioning of the screen pipe. This integrated drilling, punching, and protection coal seam drilling device organically combines the base body with the drill rod and drill bit, integrating drilling, punching, and screen pipe protection functions. Punching operations can be completed without lifting the drill after drilling. After punching, the screen pipe can be directly lowered from the drill rod. This effectively solves the problems of high risk of borehole collapse and cumbersome operation caused by soft coal seams and operational fractures. It significantly improves the continuity and stability of drilling operations in soft coal seams and increases the efficiency of punching and screen pipe protection. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an integrated drilling, flushing, and protection coal seam drilling device provided by this utility model;

[0022] Figure 2 This is a schematic diagram of the integrated drilling, flushing, and protection coal seam drilling device provided by this utility model, omitting the drill rod and drill bit.

[0023] Figure 3 This is a schematic diagram of the structure of an integrated drilling, flushing, and protection system for hydraulic flushing and hole creation in coal seams provided by this utility model;

[0024] In the diagram: 100 - Drill rod, 110 - First channel, 200 - Drill bit, 210 - Second channel, 300 - Base, 310 - Base body, 311 - Third channel, 312 - Spray nozzle, 313 - Flow path, 314 - Flushing hole, 315 - Receiving groove, 316 - Slide groove, 317 - Placement groove, 320 - Stop ring, 330 - Nozzle, 400 - Valve body, 410 - Valve plate, 420 - Fastener, 430 - First Elastic component, 500-Converter, 510-Piston, 511-Water flow path, 512-Slope, 513-Plug, 514-Slider, 520-Second elastic component, 521-Compression sleeve, 522-Second spring, 600-Support unit, 610-Crawler-type lifting vehicle, 620-Strut, 700-Water supply unit, 710-Vehicle body, 720-Water tank, 730-Hose, 740-Water supply, 750-Pressure gauge. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0026] This utility model provides an integrated drilling, flushing, and protection coal seam drilling device, the structure of which is as follows: Figure 1 - Figure 2As shown, the system includes a drill rod 100, a drill bit 200, a seat body 300, and a valve body 400. The drill rod 100 has a first channel 110 extending axially and open at both ends. The drill bit 200 has a second channel 210 extending axially and open at both ends. The seat body 300 includes a seat body 310, which has a straight third channel 311 open at both ends. The two ends of the third channel 311 are respectively connected to the outlet end of the first channel 110 and the inlet end of the second channel 210. The seat body 310 has a plurality of water nozzles 312, each connected to the third channel 311 and extending along the width direction of the third channel 311. The water nozzles 312 are close to the first channel 110. The valve body 400 is disposed on... The third channel 311, located near the second channel 210, includes a valve plate 410, a fastener 420, and a first elastic member 430. The fastener 420 connects the seat 310 and one side of the valve plate 410. The fastener 420 has a fixed state that is fastened to the seat 310 to allow the valve plate 410 to cut off the third channel 311, and a rotational state that allows it to rotate relative to the seat 310 to change the angle between the valve plate 410 and the third channel 311. When the water flow pressure upstream of the valve plate 410 is higher than a first preset value, the fastener 420 is in a rotating state. The first elastic member 430 connects the seat 310 and the valve plate 410 so that the surface of the valve plate 410 abuts against the inner wall of the third channel 311.

[0027] In use, the drill rod 100 drives the base 300 and the drill bit 200 to rotate for drilling. When cavity creation is required, water is supplied to the first channel 110, and the water pressure is lower than a first preset value. At this time, the fastener 420 is in a fixed state, and the valve plate 410 cuts off the third channel 311. The water in the first channel 110 enters the third channel 311 and is sprayed out along each of the nozzles 312, allowing cavity creation. After drilling and cavity creation are completed, water is supplied to the first channel 110, and the water pressure is higher than the first preset value. At this time, the fastener 420 is in a rotating state, and the water flow can push the valve plate 410 to rotate downstream, so that the surface of the valve plate 410 is against the inner wall of the third channel 311, and the third channel 311 is in a conductive state. Then, the water supply to the first channel 110 is stopped. Under the action of the first elastic member 430, the valve plate 410... The screen assembly, consisting of the hanger and screen tube connected in sequence, is lowered into the first channel 110 while remaining abutted against the inner wall of the third channel 311. The screen assembly is then pushed along the first channel 110, sequentially entering the third channel 311 and the second channel 210. When the screen assembly moves out of the second channel 210, the hanger opens and connects to the borehole wall, completing the positioning of the screen tube. The entire device is then lifted out, leaving the screen tube inside the borehole, allowing for borehole sealing and gas extraction operations. This integrated drilling, punching, and protection coal seam drilling device organically combines the base 300 with the drill rod 100 and the drill bit 200, integrating drilling, punching, and screen pipe protection functions. It can complete the punching operation without lifting the drill after drilling, and the screen pipe can be directly lowered from the drill rod 100 after punching. It effectively solves the problems of high risk of hole collapse and cumbersome operation caused by soft coal seams and operation fractures, significantly improves the continuity and stability of drilling operations in soft coal seams, and improves the efficiency of punching and screen pipe protection.

[0028] As a preferred embodiment, the structure of the hanger and screen pipe can be referred to the integrated drilling, protection and measurement device for drilling in soft coal seams disclosed in application number 202122524059.9, and will not be elaborated in this solution.

[0029] As a preferred embodiment, please refer to Figure 1 The base 310 has a columnar structure, and the base 310 has a third channel 311 extending along its axial direction, which facilitates drilling operations.

[0030] In a preferred embodiment, the cross-section of the third channel 311 is a circular or regular polygonal structure, which can be adaptively selected according to actual needs.

[0031] In a preferred embodiment, each of the water nozzles 312 is distributed in a ring array structure to ensure the uniformity of the hole-making operation.

[0032] As a preferred embodiment, please refer to Figure 1 and Figure 2 The seat 310 is also provided with a plurality of flow passages 313, each of which extends along the length of the third channel 311. The two ends of each flow passage 313 are located on the upstream side and the downstream side of the valve body 400, respectively, and are connected to the third channel 311. When the water pressure on the upstream side of the valve plate 410 is lower than the second preset value, the fastener 420 is in a fixed state, the valve plate 410 cuts off the third channel 311, and the water flow on the upstream side of the valve plate 410 enters the downstream side of the valve plate 410 along each of the flow passages 313 and enters the second channel 210, thereby cooling the drill bit 200.

[0033] In a preferred embodiment, each of the flow paths 313 is distributed in a ring array structure to ensure uniform cooling.

[0034] As a preferred embodiment, please refer to Figure 2 The seat 310 is also provided with a plurality of flushing holes 314. Each flushing hole 314 extends along the length of the third channel 311 and is located on the downstream side of the valve plate 410. One end of each flushing hole 314 is connected to each of the flow passages 313, and the other end of each flushing hole 314 faces the valve plate 410 and is connected to the third channel 311. When the drill bit 200 drills, slag easily accumulates on the downstream side of the valve plate 410. The water flow from each flushing hole 314 can wash away the slag on the downstream side of the valve plate 410, preventing blockage on the downstream side of the valve plate 410. When the water pressure on the upstream side of the valve plate 410 exceeds a first preset value, the rotation of the valve to the downstream side is disturbed.

[0035] In a preferred embodiment, the fastener 420 is a pin. An external thread is provided on the outer wall of one end of the pin. The seat 310 has an installation channel orthogonal to and communicating with the third channel 311. An internal thread is provided on the inner wall of one end of the installation channel. The pin passes through the installation channel, and the smooth section of the pin is rotatably connected to the smooth section of the installation channel. The external thread of the pin is screwed into the internal thread of the installation channel. When the water pressure upstream of the valve plate 410 is higher than a first preset value, the water flow can push the valve plate 410 to rotate downstream, so that the surface of the valve plate 410 is against the inner wall of the third channel 311, and the external thread of the pin separates from the internal thread of the installation channel. When the water pressure upstream of the valve plate 410 is lower than the first preset value... The external thread of the pin is screwed into the internal thread of the mounting channel, providing resistance to the valve plate 410, causing the valve plate 410 to cut off the third channel 311. When the water pressure upstream of the valve plate 410 is higher than the first preset value, the water flow pushes the valve plate 410 to rotate downstream, so that the plate surface of the valve plate 410 is in contact with the inner wall of the third channel 311. At this time, the external thread of the pin separates from the internal thread of the mounting channel. Then, the water pressure is gradually reduced, and the water flow can repeatedly flush the drill bit 200. After that, the water supply to the first channel 110 is stopped. Under the action of the first elastic member 430, the plate surface of the valve plate 410 can remain in contact with the inner wall of the third channel 311, ensuring that the third channel 311 can remain in the conductive state when the lower screen tube assembly is assembled.

[0036] As a preferred embodiment, please refer to Figure 2 The seat 310 is provided with a receiving groove 315. The opening of the receiving groove 315 is connected to the third channel 311. When the water flow pressure on the upstream side of the valve plate 410 is higher than the first preset value, the water flow can push the valve plate 410 to rotate in the downstream direction so that the valve plate 410 enters the receiving groove 315. The receiving groove 315 can accommodate the valve plate 410, increase the cross-sectional area of ​​the third channel 311 when it is open, and facilitate the passage of the hanger and screen tube through the third channel 311.

[0037] In a preferred embodiment, the valve plate 410 includes at least one valve plate. When each valve plate 410 is perpendicular to the third channel 311, the valve plates 410 are spliced ​​together to form a whole to cut off the third channel 311. The number of fasteners 420 and the first elastic element 430 is the same as the number of valve plates 410. Each fastener 420 and each first elastic element 430 is connected to each valve plate 410 in a one-to-one correspondence. By setting multiple valve plates 410, the water flow is reasonably divided. A part of the water flow is sprayed out through the nozzle 312 to create a cavity, and another part of the water flow flows to the drill bit 200 to form a flushing water flow, which ensures the cooling and slag removal effect during the drilling stage. Under high pressure, energy is concentrated for cavity creation, which improves the utilization efficiency of water pressure energy.

[0038] In a preferred embodiment, when the cross-section of the third channel 311 is circular, the number of valve plates 410 can be one or more, and the downstream sidewall of the valve plate 410 is arc-shaped so that the surface of the valve plate 410 can abut against the inner wall of the third channel 311; when the cross-section of the third channel 311 is square, the number of valve plates 410 can be one, two, or four; when the cross-section of the third channel 311 is an equilateral triangle, a regular pentagon, a regular hexagon, or a regular heptagon, the number of valve plates 410 must be the same as the number of sides of the cross-section of the third channel 311.

[0039] In a preferred embodiment, the first elastic element 430 is a first spring.

[0040] As a preferred embodiment, please refer to Figure 1 and Figure 2The integrated drilling, percussion, and protection coal seam drilling device further includes a conversion body 500, which is disposed within the third channel 311 and close to the first channel 110. The conversion body 500 includes a piston 510 and a second elastic element 520. The piston 510 is slidably and sealingly connected to the inner wall of the third channel 311. A water flow path 511 extending axially and open at both ends is provided on the piston 510. The second elastic element 520 connects the seat 310 and the piston 510, and applies a force opposite to the direction of water flow to the piston 510, thereby causing the piston 510 to block various... When the water pressure upstream of the piston 510 is higher than a second preset value, the water flow can push the piston 510 to move downstream, causing the piston 510 to move away from each of the spray nozzles 312 and block the inlet of each of the flow passages 313. With the synergistic effect of the converter 500 and the second elastic element 520, the water pressure state can be flexibly switched according to operational needs. When the water pressure is lower than the second preset value (below 5 MPa), the fastener 420 is in a fixed state, and the valve plate 410 cuts off the third channel 311. The water flow upstream of the valve plate 410 enters the downstream side of the valve plate 410 along each of the flow paths 313 and enters the second channel 210, flowing towards the drill bit 200, thereby cooling the drill bit 200 to meet the requirements of drilling cooling and punching. When the water pressure is higher than the second preset value and lower than the first preset value (between 5-10 MPa), the fastener 420 is in a fixed state, the valve plate 410 cuts off the third channel 311, and the water flow can push the piston 510 to move downstream, causing the piston 510 to move away from each of the water nozzles 312, and so on. The piston 510 blocks the inlet end of each of the flow passages 313, and the water flow is sprayed out along each of the spray nozzles 312, which can be used for hole making. The two modes can be switched precisely to ensure that the drilling and hole making processes do not interfere with each other, thus improving the applicability of the technology. The integrated design eliminates the steps of lifting the drill, taking out the punching device, and secondary pipe laying in the traditional process, shortening the construction cycle. The screen pipe assembly can be directly lowered and quickly positioned through the drill rod 100, reducing the time of open hole operation, reducing the probability of borehole collapse, and thus reducing rework costs. At the same time, the device has a compact structure and does not require additional complex equipment, which is conducive to controlling equipment investment and maintenance costs.

[0041] As a preferred embodiment, please refer to Figure 2 A slope 512 is provided on the upstream side of the piston 510, and the angle between the slope 512 and the inner wall of the third channel 311 is an acute angle.

[0042] As a preferred embodiment, please refer to Figure 2The seat 310 has multiple grooves 316 extending along the length of the third channel 311. Each groove 316 communicates with the third channel 311. The piston 510 includes a piston 513 and multiple sliders 514. The piston 513 is slidably connected to the inner wall of the third channel 311. A slope 512 is provided on the upstream side of the piston 513. Each slider 514 is fixedly connected to the piston 513, and each slider 514 is slidably connected to each groove 316 in a one-to-one correspondence. Thus, the movement of the piston 513 can be guided by the cooperation of each slider 514 and the groove 316, so that the piston 513 can only move along the axial direction of the second channel 210, preventing the piston 513 from rotating in the third channel 311 during movement.

[0043] As a preferred embodiment, please refer to Figure 2 The seat 310 has a placement groove 317, which is a cylindrical ring structure and is connected to the downstream end of the third channel 311 and each of the sliding grooves 316. The second elastic element 520 includes a compression sleeve 521 and a second spring 522. The compression sleeve 521 is a cylindrical ring structure and is placed in the placement groove 317. The downstream end of the compression sleeve 521 abuts against the seat 310, and the upstream end of the compression sleeve 521 abuts against each of the sliders 514. The second spring 522 is coaxially disposed on the compression sleeve 521. The downstream end of the second spring 522 abuts against the compression sleeve 521, and the upstream end of the second spring 522 abuts against each of the sliders 514.

[0044] In a preferred embodiment, the inner diameter of the compression sleeve 521 is slightly larger than that of the second spring 522, so that the second spring 522 can be placed inside the compression sleeve 521.

[0045] As a preferred embodiment, please refer to Figure 2 The seat 300 also includes a stop ring 320, which is fixed in the third channel 311 and located between the valve plate 410 and the inlet end of the flow passage 313. The stop ring 320 is used to abut against the downstream side of the piston 510 to limit the maximum distance that the piston 510 moves in the downstream direction, and to prevent the second spring 522 from being damaged due to excessive compression.

[0046] As a preferred embodiment, please refer to Figure 2 The stop ring 320 is used to abut against the downstream side of the plug 513.

[0047] As a preferred embodiment, please refer to Figure 2The seat 300 also includes a plurality of nozzles 330, each of which is embedded in a corresponding water outlet 312, and the inlet end of each of the nozzles 330 is connected to the third channel 311. The nozzles 330 are high-pressure nozzles, and water can be sprayed out from the nozzles 330 in a high-pressure form to improve the hole-forming effect.

[0048] Please refer to Figure 3 Based on the aforementioned integrated drilling, flushing, and protection coal seam drilling device, this utility model also provides an integrated drilling, flushing, and protection coal seam drilling device, including the aforementioned integrated drilling, flushing, and protection coal seam drilling device, a support unit 600, and a water supply unit 700. The support unit 600 is connected to the drill rod 100 and is used to support the drill rod 100. The water supply unit 700 is connected to the inlet end of the first channel 110 and is used to supply water into the first channel 110 and monitor the water flow pressure, thereby allowing for real-time adjustment of the water flow pressure.

[0049] As a preferred embodiment, please refer to Figure 3 The support unit 600 includes a tracked lifting vehicle 610 and a support rod 620. The bottom of the support rod 620 is fixedly connected to the tracked lifting vehicle 610, and the top of the support rod 620 is connected to the drill rod 100 to ensure the stability of the drill rod 100.

[0050] As a preferred embodiment, please refer to Figure 3The water supply unit 700 includes a vehicle body 710, a water tank 720, a hose 730, a water pump, a water drain 740, and a pressure gauge 750. The water tank 720 is mounted on the vehicle body 710. One end of the hose 730 is connected to the water tank 720, and the inlet of the water pump is connected to the other end of the hose 730. The outlet of the water pump is connected to the inlet of the water drain 740, and the outlet of the water drain 740 is detachably connected to the inlet of the first channel 110. The water pump supplies water to the first channel 110. The pressure gauge 750 monitors the water pressure. After all drilling and hole-making operations are completed, the water pump pressure is adjusted to above 10 MPa, and the water flow pushes the valve plate 410 downstream. The valve plate 410 is rotated laterally so that its surface is against the inner wall of the third channel 311. At this time, the external thread of the pin is separated from the internal thread of the mounting channel. Then, the water pressure is gradually reduced, and the water flow can repeatedly flush the drill bit 200. After that, the water supply to the first channel 110 is stopped. Under the action of the first elastic member 430, the surface of the valve plate 410 can remain against the inner wall of the third channel 311, ensuring that the third channel 311 can remain in the conductive state when the screen pipe assembly is lowered. The outlet end of the water outlet 740 is separated from the inlet end of the first channel 110, and the screen pipe assembly, which is composed of the hanger and the screen pipe connected in sequence, is lowered into the first channel 110 of the drill rod 100.

[0051] To better understand this utility model, the following is combined with... Figure 1 - Figure 3 The working principle of the technical solution of this utility model will be described in detail below:

[0052] In use, the drill rod 100 drives the base 300 and the drill bit 200 to rotate for drilling. The water pump pressure is adjusted to below 5 MPa, and water is supplied to the first channel 110 via the water pump. At this time, the external thread of the pin is screwed into the internal thread of the mounting channel, providing resistance to the valve plate 410, causing the valve plate 410 to cut off the third channel 311. Water flowing upstream of the valve plate 410 enters the downstream side of the valve plate 410 along each of the flow paths 313 and enters the second channel 210, flowing towards the drill bit 200. This cools the drill bit 200, meeting the requirements for drilling cooling and perforation. When cavity creation is required, the water pump pressure is adjusted... Adjusting the pressure to above 5MPa and below 10MPa, the external thread of the pin is screwed into the internal thread of the mounting channel, providing resistance to the valve plate 410. This causes the valve plate 410 to cut off the third channel 311, allowing the water flow to push the piston 510 downstream. The piston 510 then moves away from each of the spray nozzles 312 and blocks the inlet of each of the flow paths 313. Water flows out along each of the spray nozzles 312, enabling cavity creation. After cavity creation, the pump pressure is adjusted to below 5MPa, and the piston 510 resets under the action of the second elastic element 520. Water then flows back into the downstream side of the valve plate 410 along each of the flow paths 313. The water enters the second channel 210 and flows to the drill bit 200, cooperating with the drilling rig rotation to carry out the next stage of drilling and hole formation. When it is necessary to perform hole-making operation again, the second step can be repeated. After all drilling and hole-making operations are completed, the water pump pressure is adjusted to above 10MPa, and the water flow pushes the valve plate 410 to rotate in the downstream direction, so that the plate surface of the valve plate 410 is in contact with the inner wall of the third channel 311. At this time, the external thread of the pin is separated from the internal thread of the installation channel. Then, the water flow pressure is gradually reduced, and the water flow can repeatedly flush the drill bit 200. After that, the water supply to the first channel 110 is stopped. Under the action of the first elastic element 430, the plate surface of the valve plate 410... The device can remain close to the inner wall of the third channel 311, ensuring that the third channel 311 remains in a conductive state when the screen pipe assembly is lowered. The outlet end of the water outlet 740 is separated from the inlet end of the first channel 110. The screen pipe assembly, consisting of a hanger and a screen pipe connected in sequence, is lowered into the first channel 110 of the drill rod 100. The screen pipe assembly is pushed along the first channel 110, and then sequentially enters the third channel 311 and the second channel 210. When the screen pipe assembly moves out of the second channel 210, the hanger opens and connects to the borehole wall, completing the positioning of the screen pipe. Then, the entire device is lifted out, leaving the screen pipe inside the borehole, and then the borehole sealing and gas extraction operation can be carried out. This is an integrated drilling, flushing, and protection coal seam drilling device.The base 300 is organically combined with the drill rod 100 and the drill bit 200, integrating drilling, perforation, and screen pipe protection functions. Perforation can be completed without lifting the drill after drilling, and the screen pipe can be directly lowered into the drill rod 100 after perforation. This effectively solves the problems of high risk of hole collapse and cumbersome operation caused by soft coal seams and operational disruptions, significantly improving the continuity and stability of drilling operations in soft coal seams and increasing the efficiency of perforation and screen pipe protection.

[0053] The integrated drilling, flushing, and protection coal seam drilling device and system provided by this utility model has the following beneficial effects:

[0054] (1) The valve plate 410 is used to achieve reasonable water flow diversion. Part of the water flow is sprayed out through the nozzle 312 to create a cavity, and the other part of the water flow flows to the drill bit 200 to form a flushing water flow, which ensures the cooling and slag removal effect during the drilling stage. Under high pressure, energy is concentrated for creating a cavity, which improves the utilization efficiency of water pressure energy.

[0055] (2) With the synergistic effect of the converter 500 and the second elastic element 520, the water pressure state can be flexibly switched according to the operation requirements. When the water pressure is lower than the second preset value (≤5MPa), the fastener 420 is in a fixed state, the valve plate 410 cuts off the third channel 311, and the water flow on the upstream side of the valve plate 410 enters the downstream side of the valve plate 410 along each of the flow paths 313 and enters the second channel 210, flowing towards the drill bit 200, thereby cooling the drill bit 200 to meet the drilling cooling and punching requirements. When the water pressure is higher than the second preset value and lower than the first preset value (5-10MPa), the fastener 420 is in a fixed state, the valve plate 410 cuts off the third channel 311, and the water flow can push the piston 510 to move downstream, so that the piston 510 moves away from each of the water nozzles 312 and blocks the inlet end of each of the flow paths 313. The water flow sprays out along each of the water nozzles 312, which can be used for hole making. The two modes are switched accurately, ensuring that the drilling and hole making processes do not interfere with each other, thus improving the applicability of the technology.

[0056] (3) The base 300 is organically combined with the drill rod 100 and the drill bit 200 to integrate drilling, punching and hole making and screen pipe protection functions. The punching operation can be completed without lifting the drill after drilling. After punching, the screen pipe can be directly lowered from the drill rod 100. This effectively solves the problems of high risk of hole collapse and complicated operation caused by soft coal seam and operation. It significantly improves the continuity and stability of drilling operation in soft coal seam and improves the efficiency of punching and screen pipe protection.

[0057] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A drilling and flushing integrated coal seam drilling device, characterized in that, include: A drill pipe having a first channel extending along its axial direction and open at both ends; A drill bit having a second channel extending along its axial direction and open at both ends; A seat body includes a seat body having a straight third channel with openings at both ends. The two ends of the third channel are respectively connected to the outlet end of the first channel and the inlet end of the second channel. The seat body has a plurality of water spray nozzles that are all connected to the third channel and extend along the width direction of the third channel. The water spray nozzles are close to the first channel. A valve body, disposed within the third channel and close to the second channel, includes a valve plate, a fastener, and a first elastic element. The fastener connects the seat body and one side of the valve plate. The fastener has a fixed state in which it is fastened to the seat body to allow the valve plate to cut off the third channel, and a rotational state in which it can rotate relative to the seat body to change the angle between the valve plate and the third channel. When the water flow pressure upstream of the valve plate is higher than a first preset value, the fastener is in a rotating state. The first elastic element connects the seat body and the valve plate so that the surface of the valve plate is in contact with the inner wall of the third channel.

2. The drilling and flushing integrated coal seam drilling device according to claim 1, characterized in that, The seat body is also provided with multiple flow passages, each of which extends along the length of the third channel. The two ends of each flow passage are located on the upstream and downstream sides of the valve body, respectively, and are connected to the third channel. When the water flow pressure on the upstream side of the valve plate is lower than the second preset value, the fastener is in a fixed state, the valve plate cuts off the third channel, and the water flow on the upstream side of the valve plate enters the downstream side of the valve plate along each of the flow passages and enters the second channel.

3. The drilling and flushing integrated coal seam drilling device according to claim 2, characterized in that, The seat body is also provided with a plurality of flushing holes, each of which extends along the length of the third channel and is located on the downstream side of the valve plate. One end of each flushing hole is connected to each of the flow paths, and the other end of each flushing hole faces the valve plate and is connected to the third channel.

4. The drilling and flushing integrated coal seam drilling device according to claim 1, characterized in that, The fastener is a pin, with an external thread on the outer wall of one end. The seat has an installation channel that is orthogonal to and connected to the third channel. An internal thread is provided on the inner wall of one end of the installation channel. The pin passes through the installation channel, and the smooth section of the pin is rotatably connected to the smooth section of the installation channel. The external thread of the pin is screwed into the internal thread of the installation channel. When the water pressure upstream of the valve plate is higher than a first preset value, the water flow can push the valve plate to rotate downstream, so that the surface of the valve plate is against the inner wall of the third channel, and the external thread of the pin is separated from the internal thread of the installation channel.

5. The drilling and flushing integrated coal seam drilling device according to claim 1, characterized in that, The seat body is provided with a receiving groove, and the opening of the receiving groove is connected to the third channel. When the water flow pressure on the upstream side of the valve plate is higher than the first preset value, the water flow can push the valve plate to rotate in the downstream direction so that the valve plate enters the receiving groove.

6. The drilling and flushing integrated coal seam drilling device according to claim 2, characterized in that, It also includes a converter, which is disposed in the third channel and close to the first channel. The converter includes a piston and a second elastic element. The piston is slidably connected to the inner wall of the third channel. A water flow path is opened on the piston, extending axially and open at both ends. The second elastic element connects the seat and the piston and applies a force to the piston opposite to the direction of water flow, so that the piston blocks each of the spray nozzles. When the water pressure upstream of the piston is higher than a second preset value, the water flow can push the piston to move downstream, so that the piston moves away from each of the spray nozzles and blocks the inlet end of each of the flow paths.

7. The integrated drilling, flushing, and protection coal seam drilling device according to claim 6, characterized in that, A slope is formed on the upstream side of the piston, and the angle between the slope and the inner wall of the third channel is an acute angle.

8. The drilling and flushing integrated coal seam drilling device according to claim 6, characterized in that, The seat also includes a stop ring, which is fixed in the third channel and located between the valve plate and the inlet end of the flow passage. The stop ring is used to abut against the downstream side of the piston to limit the maximum distance the piston can move in the downstream direction. 9.The drilling and flushing integrated coal seam drilling device according to claim 1, characterized in that, The base also includes multiple nozzles, each nozzle being embedded in a corresponding water outlet, and the inlet end of each nozzle being connected to the third channel.

10. A drilling and flushing integrated coal seam drilling system, characterized in that, The device includes the integrated drilling, flushing, and support coal seam drilling apparatus as described in claims 1-9, a support unit, and a water supply unit. The support unit is connected to the drill rod and is used to support the drill rod. The water supply unit is connected to the inlet end of the first channel and is used to supply water into the first channel and monitor the pressure of the water flow.

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