An inner slagging device and a slagging method thereof

Abstract

The present application provides a kind of inner slag discharging device and its slag discharging method, it includes high wear-resistant obturator, drill bit drill rod device, venturi water and drill slag dry-wet separator, the drill bit drill rod device is located in high wear-resistant obturator, drill slag dry-wet separator is connected with drill bit drill rod device by venturi water.The flow direction of drill slag can be changed by changing the running direction of slag discharging medium, so as to reduce the scouring, soaking and friction of slag discharging medium and drill slag on the hole wall, which is beneficial to the formation of drilling hole;It can achieve the purpose of point coring by achieving "falling and discharging simultaneously";Drilling cuttings can be well collected, which is beneficial to the civilized production of construction site and prevents dirtiness and disorder;If inert gas is used for slag discharging during construction, it can also achieve the purpose of inhibiting spontaneous combustion of coal seam.Through the above technical scheme analysis, the device is theoretically feasible and the operation is reliable, which provides good drilling quality for casing, greatly improves the success rate of drilling and casing and the extraction effect.

Description

Technical Field

[0001] This invention belongs to the field of coal mine gas extraction construction, and more specifically, it relates to an internal slag discharge device and its slag discharge method. Background Technology

[0002] Gas drainage drilling in coal mines often faces a series of key technical challenges that restrict the effectiveness of gas drainage, such as hole collapse due to soft coal and rock strata, gas blowout due to high pressure, difficulty in cleaning drill cuttings at negative angles, and difficulty in installing pipes after drilling is completed. These difficulties seriously restrict the safe development of mines and the efficient utilization of gas energy.

[0003] Analysis of traditional drilling techniques leads to the conclusion that the slag removal process during drilling is detrimental to borehole formation and may even damage the borehole. The traditional slag removal process involves the slag medium being pushed to the bottom of the hole under positive pressure through the holes in the drill rod and drill bit. After mixing with the drill cuttings, the slag is discharged through the gap between the drill rod and the borehole wall. This method of slag removal has several disadvantages: First, when the drill cuttings cut by the rotating drill bit are discharged under positive pressure, they rub against the borehole wall throughout the entire process, causing damage to the borehole wall. This is especially true when encountering soft sections of coal and rock, which exacerbates borehole wall detachment and makes borehole formation difficult. Second, most slag removal media rely on water. After prolonged immersion in water, the borehole wall becomes unstable and deformed. Especially during downhole drilling, the water pressure must overcome the weight of the drill cuttings to remove them. Higher water pressure further facilitates water intrusion into the coal and rock mass within the borehole wall. Third, the drill cuttings that rub against the borehole wall become viscous when exposed to water, increasing slag removal resistance. When the drill cuttings are not discharged smoothly and the gas pressure increases, blowouts may occur, causing further damage to the borehole wall. Fourth, during continuous drilling, water and gas that seep into the coal and rock mass are pumped into the extraction pipe, causing secondary sedimentation at the bottom of the borehole and clogging it. Fifth, while using gaseous slag removal can significantly reduce the impact of water on the borehole wall, it cannot solve the problem of drill cuttings damaging the borehole wall and increasing slag removal resistance due to friction between the drill rod and the borehole wall. Furthermore, when using gaseous slag removal, the flow direction of the gas changes due to resistance as it enters the space between the drill rod and the borehole wall, and the drill cuttings seep into the borehole wall gaps, further increasing slag removal resistance. Sixth, continuous discharge of drill cuttings makes it impossible to accurately determine core samples at each stage, hindering targeted coring. Coring with a coring drill rod is necessary, requiring repeated drilling and rod replacements, making the process cumbersome. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides an internal slag removal device and method. After sealing the borehole opening with a high-wear-resistant plug, a large amount of slag removal medium is injected into the borehole through the drill rod and the high-wear-resistant plug, increasing the pressure difference between the inside and outside of the borehole. This forces the slag removal medium to flow from the borehole opening through the bottom of the borehole and out through the end of the drill rod. A Venturi-type water braid at the end of the drill rod further increases the flow velocity of the slag removal medium, thus ensuring that drill cuttings are carried by the slag removal medium to the Venturi water braid for immediate discharge. Because the high-wear-resistant plug has a medium channel, it can carry away surrounding rock material that rubs off between the drill rod and the borehole wall into the drill rod, ensuring a smooth borehole wall at all times. This overcomes many drawbacks of traditional slag removal processes.

[0005] The purpose and effectiveness of the internal slag discharge device and slag discharge method of the present invention are achieved by the following specific technical means:

[0006] An internal slag discharge device includes a high wear-resistant plug, a drill bit and drill rod assembly, a Venturi water braid, and a slag dry-wet separator. The drill bit and drill rod assembly is located inside the high wear-resistant plug, and the slag dry-wet separator is connected to the drill bit and drill rod assembly via the Venturi water braid.

[0007] The high wear-resistant plugging device has a conical structure, which includes a body, a medium channel on the body, a drill bit and drill rod channel in the middle of the body, and several fish-scale baffles on the inner axis of the drill bit and drill rod channel. The medium channel is located on the side wall of the body, and a slag discharge medium is connected to the outside of the medium channel through a pipe. The body and the fish-scale baffles are made of a highly wear-resistant and antistatic elastic material.

[0008] The outer wall of the main body is provided with several ring-shaped friction rings. The friction rings have a triangular cross-sectional shape and are fixedly connected to the outer wall of the main body. The height of the friction rings is 5-8mm.

[0009] The high-wear-resistant plug is conical in shape and made of a highly wear-resistant, antistatic, and elastic material. The smaller diameter end of the plug is inserted into the borehole opening and compacted. The drill bit and drill rod assembly is located within a fish-scale baffle installed on the drill bit and drill rod channel. A media pipe is connected to the media channel. Through the combined effects of the high-wear-resistant plug compacting at the borehole opening, the media pipe connecting the media channel, and the contact between the drill bit and drill rod assembly and the fish-scale baffle, the channels inside and outside the borehole are isolated, forming a sealed space. Slag-discharging media is injected through the media channel and the Venturi-type water braid, increasing the positive pressure inside the borehole and widening the pressure difference between the inside and outside of the borehole, thus continuously providing power for the flow of slag-discharging media.

[0010] After the high-wear-resistant plug is inserted into the borehole opening and compacted, it can be fixed to the support material near the opening with wire to resist strong internal and external pressure differences and solve the problem of borehole blowout. The fish-scale baffle is a hollow frustum shape, with the cavity slightly smaller than the diameter of the drill rod.

[0011] The drill bit and drill rod assembly includes a drill rod and a drill bit. The drill rod and the drill bit are connected by threads. The drill rod is located inside the main body and is wrapped by a fish-scale baffle inside the main body. The drill rod is a single section or a multi-section structure that is threaded together with each other.

[0012] The drill rod includes an outer tube and an inner tube. The inner tube is located inside the outer tube and is connected by a fixing device. The outer tube has a male head and a female head at both ends. The outer tube and the inner tube together form a double-layer ring structure. The drill rod is connected to the drill head or to the female head of another section of the drill rod through the male head.

[0013] The outer tube consists of a male and female connector and the main body of the drill rod. It is a smooth drill rod with an outer diameter of 73mm and a wall thickness of 9.5mm. The inner tube is a steel pipe with an inner diameter of 38mm and a wall thickness of 5mm. Both the male and female connectors use flat-threaded connections with a connection length of 80mm. The inner tube of the male connector is slightly longer than the outer tube by 50mm, and the inner tube of the female connector is slightly shorter than the outer tube by 50mm. This design ensures that the male connector is slightly longer than the outer tube, so that even if the threads are not fully tightened, the male and female connectors are already connected, thus maintaining the seal of the inner tube.

[0014] The male and female ends of the outer tube are all made of 40CrMo material to ensure a certain level of strength and hardness, while the inner tube and the rod body are made of ordinary steel. The outer and inner tubes of the male and female ends and the rod body are welded together using a fixing device and then connected into a whole using friction welding.

[0015] The drill bit includes a cutting blade and a drill body. The cutting blade is fixedly connected to the front end of the drill body. A female connector is provided at the rear end of the drill body and is movably connected to the male connector of the drill rod through the female connector. A cuttings inlet is provided on the front side wall of the drill body, and a cuttings discharge medium outlet is provided on the rear side wall of the drill body. A cuttings channel is provided in the middle of the drill body. The cuttings channel is connected to the cuttings inlet, the inner tube of the drill rod, and the cuttings dry-wet separator. The cuttings discharge medium outlet is connected to the interlayer between the outer tube and the inner tube of the drill rod.

[0016] The drill bit is a hollow cylindrical structure with an arc-shaped cutting blade and a cutting slag inlet at one end and a connecting head and a slag discharge medium outlet at the other end. The hollow cylindrical structure serves as a cutting slag channel.

[0017] The arc-shaped cutting blade forms a 13%-15% angle with the cutting post, providing both grinding and cutting functions during cutting. It is made of 40CrMo material to ensure a certain level of strength and hardness.

[0018] The Venturi-type water braid includes an air amplifier, a water braid, and a media inlet. The air amplifier and the water braid are directly connected. The media inlet is a three-way structure and is connected to the sidewalls of both the air amplifier and the water braid. The slag discharge medium can enter the air amplifier and the water braid through the media inlet. A male thread is provided at the end of the water braid. The Venturi-type water braid is detachably connected to the female end of the drill pipe through the male thread. The water braid is a double-layer cylindrical structure. The outer layer is a male thread, and the inner layer is a round tube connected to the inner tube of the drill pipe. The other end of the round tube is connected to the air amplifier. The air amplifier is a Venturi structure. The media inlet is connected to the interlayer of both the air amplifier and the drill pipe.

[0019] The tee at the medium inlet can divert a portion of the slag discharge medium into the interlayer between the inner and outer tubes of the drill pipe, allowing it to flow along the drill pipe to the drill bit, while another portion is diverted into the air amplifier.

[0020] The drill cuttings dry-wet separator is a box structure, with support legs, a cuttings inlet pipe, and a water inlet on the box. The drill cuttings dry-wet separator is connected to the outlet of the air amplifier through the cuttings inlet pipe. The cuttings inlet pipe is located at the top of the drill cuttings dry-wet separator and is equipped with a cuttings separation port and a blowout preventer. The blowout preventer is connected to the gas extraction pipe through a pipe. Several dust removal nozzles are installed inside the box and are connected to the water inlet. An observation port is installed on the side wall of the box, and a dry-wet separation water tank is installed at the bottom of the box.

[0021] The bottom of the slag inlet pipe is equipped with a slag separation port, and a valve is installed on the slag inlet pipe. The slag channel can be changed by controlling the valve, and the slag can be separated into dry and wet parts by entering the slag inlet pipe. When the slag inlet pipe is closed, the core can be taken from a fixed point through the slag separation port.

[0022] The dry-wet separation tank includes a receiving trough, a filter device, and a pneumatic motor. The receiving trough is connected to the bottom of the drill cuttings dry-wet separator housing. The two ends of the receiving trough are connected to the filter device and the pneumatic motor respectively through flanges. Several spiral blades are set inside the receiving trough and the filter device. The spiral blades are connected to the pneumatic motor shaft through guide rods. Several filter holes are set at the bottom of the filter device. Several screws are set at the end of the filter device. Spring pressure plates are set on the screws. The bottom of the spring pressure plates is the slag outlet. The size of the slag outlet can be adjusted by the screws.

[0023] The spiral blades provide the pushing force, and the spring pressure plate provides the pressure. The two squeeze each other to squeeze out the water. As the pressure increases further, the drill cuttings move towards the spring pressure plate and eventually fall out through the cuttings outlet.

[0024] The drill cuttings dry-wet separator is connected to the housing through a cuttings inlet pipe, and the dust removal nozzle is connected to the water inlet through a pipe. The dry-wet separation water tank at the bottom can receive all the drill cuttings. It rotates under the drive of a pneumatic motor to carry out dry-wet separation operations, and the blowout preventer is connected to the extraction pipeline.

[0025] A method for removing slag using an internal slag removal device, comprising the following steps: 1. Before drilling, the borehole to be drilled is enlarged using a reaming drill bit, and a high-wear-resistant plug is placed in the reaming section of the borehole and pressed tightly against the borehole wall to form a reliable whole; 2. During drilling, slag removal medium is injected into the medium channel and the medium inlet respectively. The counterflow baffle can effectively prevent the slag removal medium from overflowing from the borehole opening, continuously delivering the slag removal medium into the borehole, forcing the pressure difference between the inside and outside of the borehole to increase, changing the flow direction of the slag removal medium, and ultimately forming slag removal in the inner layer of the double-layer drill rod, and slag removal medium entering between the outer layer of the double-layer drill rod and the borehole wall; 3. During the process of slag removal through the drill rod, when drilling stops and the drill bit is not cutting the coal and rock mass, no slag is discharged from the drill rod. When the drill rod rotates to cut the coal and rock mass, the cut slag can be carried out of the borehole in a timely manner. Internally, this method facilitates core sampling at a given point, accurately recording the precise location of drill cuttings. Drill cuttings are promptly discharged through the cuttings separator, allowing for analysis and research into the basic conditions of the coal and rock mass. Fourthly, when the drill cuttings discharged by the air amplifier and positive pressure medium detach from the drill rod, they enter the drill cuttings dry-wet separator. Opening the water inlet atomizes the dust removal nozzles, causing a large amount of water mist to capture dust and fall onto the dry-wet separation tank. A pneumatic motor installed on the dry-wet separation tank drives the spiral blades to rotate on the guide rod, gradually squeezing the dry and wet drill cuttings into the filter device. Under the combined pressure of the spring plates and the spiral blades, the water in the drill cuttings is discharged through the filter holes. As the pneumatic motor drives the spiral blades to continue rotating, the drill cuttings with squeezed-out water continue to move towards the end until they are discharged from the drill cuttings dry-wet separator through the cuttings outlet, achieving slag-water separation.

[0026] The present invention has at least the following beneficial effects:

[0027] After sealing the borehole with a high-wear-resistant plug, the pressure difference between the inside and outside of the borehole is increased by injecting a large amount of slag removal medium into the borehole and by using a Venturi amplification device at the end of the drill pipe. This forces the gas to change its flow direction, and the drill cuttings cut by the drill bit immediately enter the drill pipe and are discharged. The surrounding rock mass that falls off due to friction between the drill pipe and the borehole wall is also sucked into the drill pipe, ensuring that the borehole wall is always smooth. This solves many of the drawbacks of the traditional slag removal process. First, when encountering coal and rock masses with high gas content, the gas is directly sucked into the drill pipe and sent into the extraction pipe through the drill cuttings dry-wet separator at the end of the drill pipe, avoiding gas exceeding the limit. Second, it can ensure that there is no residual slag in the borehole at any time, enabling targeted coring. Third, if the entire slag removal process uses gas slag removal without the participation of water, even when encountering mudstone, there will be no waterlogging or borehole collapse. Fourth, the entire process achieves "no drill cuttings on the ground," enabling dry-wet separation of drill cuttings. Drill cuttings can directly enter the transportation system, and water enters the drainage system, resulting in a clean and tidy on-site production environment.

[0028] By changing the direction of the slag removal medium, the flow direction of the drill cuttings is altered, reducing the scouring and soaking damage to the borehole wall caused by the slag removal medium and drill cuttings. This change in flow direction allows for "discharge as it falls," reducing friction between the drill cuttings and the borehole wall, effectively clearing the slag removal channel and facilitating core sampling. During the retraction process after drilling is completed, the drill cuttings knocked off by the drill rod and drill bit are carried away again, achieving secondary borehole cleaning. Using inert gas for slag removal during construction doubles the effect. Based on the above technical analysis, this device is theoretically feasible and reliable in operation, providing excellent borehole quality for casing installation and significantly improving the success rate of casing installation and extraction efficiency. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the high wear-resistant plugging device of the present invention;

[0031] Figure 3 This is a cross-sectional view of the high wear-resistant plug of the present invention;

[0032] Figure 4 This is a side view of the high wear-resistant plug of the present invention;

[0033] Figure 5 This is a schematic diagram of the drill bit and drill rod device structure of the present invention;

[0034] Figure 6 This is a schematic diagram of the drill pipe structure of the present invention;

[0035] Figure 7 This is a side view of the drill pipe of the present invention;

[0036] Figure 8 This is a schematic diagram of the male and female connection of the drill pipe of the present invention;

[0037] Figure 9 This is a schematic diagram of the drill bit structure of the present invention;

[0038] Figure 10 This is a side view of the drill bit of the present invention;

[0039] Figure 11 This is a schematic diagram of the Venturi-type water braid structure of the present invention;

[0040] Figure 12 This is a schematic diagram of the drill cuttings dry-wet separator of the present invention;

[0041] Figure 13 This is a side view of the drill cuttings dry-wet separator of the present invention;

[0042] Figure 14This is a top view of the drill cuttings dry-wet separator of the present invention. Detailed Implementation

[0043] The embodiments of the present invention will be described in further detail below through examples. These examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0044] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "rotation," "inner diameter," and "outer diameter," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components; they can refer to a decrease in diameter or an increase in diameter. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] Example:

[0047] As attached Figure 1 To be continued Figure 14 As shown: This invention provides an internal slag discharge device, which includes a high-wear-resistant plug 1, a drill bit and drill rod assembly 2, a Venturi-type water braid 3, and a drill slag dry-wet separator 4. The drill bit and drill rod assembly 2 is located inside the high-wear-resistant plug 1, and the drill slag dry-wet separator 4 is connected to the drill bit and drill rod assembly 2 through the Venturi-type water braid 3. The high-wear-resistant plug is shaped like a frustum with different diameters at both ends and has two channels. The drill bit and drill rod assembly channels are equipped with fish-scale baffles.

[0048] Further details are attached. Figure 2-4As shown, the high wear-resistant plugging device 1 has a conical structure, which includes a body 11, a medium channel 12 on the body 11, a drill bit and drill rod channel 13 in the middle of the body 11, and several fish-scale baffles 14 on the inner axis of the drill bit and drill rod channel 13. The medium channel 12 is located on the side wall of the body 11, and the slag discharge medium is connected to the outside of the medium channel 12 through a pipe. The body 11 and the fish-scale baffles 14 are made of a highly wear-resistant and antistatic elastic material.

[0049] Furthermore, several ring-shaped friction rings 15 are provided on the outer wall of the main body 11. The friction rings 15 have a triangular cross-sectional shape and are fixedly connected to the outer wall of the main body 11. The height of the friction rings 15 is 5-8mm.

[0050] Furthermore, the high-wear-resistant plug is cone-shaped and made of a highly wear-resistant, anti-static, and elastic material. The smaller diameter end of the high-wear-resistant plug is inserted into the borehole opening and compacted. The drill bit and drill rod assembly is located within a fish-scale baffle installed on the drill bit and drill rod channel. A media pipe is connected to the media channel. Through the combined effects of the high-wear-resistant plug compacting at the borehole opening, the media pipe connecting the media channel, and the contact between the drill bit and drill rod assembly and the fish-scale baffle, the channels inside and outside the borehole are isolated, forming a sealed space. Slag discharge medium is injected through the media channel and the Venturi-type water braid, increasing the positive pressure inside the borehole and widening the pressure difference between the inside and outside of the borehole, thus continuously providing power for the flow of slag discharge medium.

[0051] Furthermore, after the high-wear-resistant plug is inserted into the borehole opening and compacted, it can be fixed to the support material near the opening with wire to resist strong internal and external pressure differences and solve the problem of borehole blowout. The fish-scale baffle is a hollow frustum shape, with the cavity slightly smaller than the diameter of the drill rod.

[0052] Further details are attached. Figure 5-10 As shown, the drill bit and drill rod assembly 2 includes a drill rod 21 and a drill bit 22. The drill rod 21 and the drill bit 22 are connected by threads. The drill rod 21 is located inside the body 11 and is wrapped by a fish-scale baffle 14 inside the body 11. The drill rod 21 is a single section or a multi-section structure that is threaded together with each other.

[0053] Furthermore, the drill rod 21 includes an outer tube 211 and an inner tube 212. The inner tube 212 is located inside the outer tube 211 and is connected by a retainer 213. The outer tube 211 has a male head 214 and a female head 215 at both ends. The outer tube 211 and the inner tube 212 together form a double-layer ring structure. The drill rod 21 is connected to the drill bit 22 or to the female head 215 of another section of the drill rod 21 through the male head 214.

[0054] The outer tube consists of a male and female connector and the main body of the drill rod. It is a smooth drill rod with an outer diameter of 73mm and a wall thickness of 9.5mm. The inner tube is a steel pipe with an inner diameter of 38mm and a wall thickness of 5mm. Both the male and female connectors use flat-threaded connections with a connection length of 80mm. The inner tube of the male connector is slightly longer than the outer tube by 50mm, and the inner tube of the female connector is slightly shorter than the outer tube by 50mm. This design ensures that the male connector is slightly longer than the outer tube, so that even if the threads are not fully tightened, the male and female connectors are already connected, thus maintaining the seal of the inner tube.

[0055] Furthermore, the male and female connectors of the outer tube are all made of 40CrMo material to ensure a certain level of strength and hardness, while the inner tube and the rod body are made of ordinary steel. The outer and inner tubes of the male and female connectors and the rod body are welded together using a fixing device and then connected into a whole using friction welding.

[0056] Further details are attached. Figure 9 As shown, the drill bit 22 includes a cutting blade 221 and a drill body 226. The cutting blade 221 is fixedly connected to the front end of the drill body 226. The rear end of the drill body 226 is provided with a connecting female head 225 and is movably connected to the male head 214 of the drill rod 21 through the connecting female head 225. A cuttings inlet 223 is provided on the front side wall of the drill body 226, and a cuttings discharge medium outlet 222 is provided on the rear side wall of the drill body 226. A cuttings channel 224 is provided in the middle of the drill body 226. The cuttings channel 224 is connected to the cuttings inlet 223, the inner tube 212 of the drill rod 21, and the cuttings dry and wet separator 4. The cuttings discharge medium outlet 222 is connected to the interlayer between the outer tube 211 and the inner tube 212 of the drill rod 21.

[0057] Furthermore, the drill bit 22 is a hollow cylindrical structure with an arc-shaped cutting blade 221 and a cutting slag inlet 223 at the end, and a connecting head 225 and a slag discharge medium outlet 222 at the tail. The hollow cylindrical structure serves as a cutting slag channel.

[0058] Furthermore, the arc-shaped cutting blade 221 forms a 13%-15% angle with the cutting post, providing both grinding and cutting functions during cutting. It is made of 40CrMo material to ensure a certain level of strength and hardness.

[0059] Further details are attached. Figure 11As shown, the Venturi-type water braid 3 includes an air amplifier 31, a water braid 32, and a medium inlet 33. The air amplifier 31 and the water braid 32 are directly connected. The medium inlet 33 is a three-way structure and is connected to the side walls of the air amplifier 31 and the water braid 32 respectively. The slag discharge medium can enter the air amplifier 31 and the water braid 32 respectively through the medium inlet 33. A male thread 34 is provided at the end of the water braid 32. The Venturi-type water braid 3 is detachably connected to the female head 215 of the drill rod 21 through the male thread 34. The water braid 32 is a double-layer cylindrical structure. The outer layer is a male thread 34, and the inner layer is a round tube 35 connected to the inner tube 212 of the drill rod 21. The other end of the round tube 35 is connected to the air amplifier 31. The air amplifier 31 is a Venturi structure. The medium inlet 33 is connected to the interlayer of the air amplifier 31 and the drill rod 21 respectively.

[0060] The tee at the medium inlet can divert a portion of the slag discharge medium into the interlayer between the inner and outer tubes of the drill pipe, allowing it to flow along the drill pipe to the drill bit, while another portion is diverted into the air amplifier.

[0061] Further details are attached. Figure 12-14 As shown, the drill cuttings dry-wet separator 4 is a box structure. Support legs 40, a cuttings inlet pipe 42, and a water inlet 44 are respectively provided on the box. The drill cuttings dry-wet separator 4 is connected to the outlet of the air amplifier 31 through the cuttings inlet pipe 42. The cuttings inlet pipe 42 is located at the top of the drill cuttings dry-wet separator 4 and is respectively provided with a cuttings separation port 41 and a blowout preventer 43. The blowout preventer 43 is connected to the gas extraction pipe through a pipe. Several dust removal nozzles 45 are respectively provided in the box and are connected to the water inlet 44. An observation port 46 is provided on the side wall of the box, and a dry-wet separation water tank 47 is provided at the bottom of the box.

[0062] Furthermore, a slag separation port 41 is provided at the bottom of the slag inlet pipe 42, and a valve is provided on the slag inlet pipe 42. The slag channel can be changed by controlling the valve, and the slag can enter the slag inlet pipe 42 for dry and wet separation of the slag. When the slag inlet pipe 42 is closed, the core can be taken from the slag separation port 41 at a fixed point.

[0063] Furthermore, the dry-wet separation tank 47 includes a receiving trough 471, a filter device 474, and a pneumatic motor 48. The receiving trough 471 is connected to the bottom of the drill cuttings dry-wet separator 4. The two ends of the receiving trough 471 are connected to the filter device 474 and the pneumatic motor 48 respectively through flanges 477. Several spiral blades 473 are arranged inside the receiving trough 471 and the filter device 474. The spiral blades 473 are connected to the shaft of the pneumatic motor 48 through guide rods 472. Several filter holes 478 are arranged at the bottom of the filter device 474. Several screws are arranged at the end of the filter device 474. Spring pressure plates 475 are arranged on the screws. The bottom of the spring pressure plates 475 is the slag outlet 476. The size of the slag outlet 476 can be adjusted by the screws.

[0064] The spiral blade 473 provides pushing force, and the spring pressure plate 475 provides pressure. The two squeeze each other to squeeze out the water. As the pressure increases further, the drill cuttings move towards the spring pressure plate 475 and finally fall out through the cuttings outlet 476.

[0065] Furthermore, the drill cuttings dry-wet separator is connected to the housing through the cuttings inlet pipe, the dust removal nozzle is connected to the water inlet through the pipe, and the dry-wet separation water tank set at the bottom can receive all the drill cuttings. Driven by the pneumatic motor, it rotates to carry out dry-wet separation operation, and the blowout preventer is connected to the extraction pipeline.

[0066] A method for removing slag using an internal slag removal device comprises the following steps: 1. Before drilling, the borehole to be drilled is enlarged using a reaming drill bit. A high-wear-resistant plug 1 is placed in the reaming section of the borehole and pressed tightly against the borehole wall to form a reliable integral structure. 2. During drilling, slag removal medium is injected into the medium channel 12 and the medium inlet 33 respectively. The counterflow baffle 14 effectively prevents the slag removal medium from overflowing from the borehole opening, continuously supplying slag removal medium into the borehole, forcing a larger pressure difference between the inside and outside of the borehole, changing the flow direction of the slag removal medium, and ultimately forming slag removal in the inner layer of the double-layer drill rod and slag removal medium entering the outer layer of the double-layer drill rod and between the drill rod and the borehole wall. 3. During the slag removal process through the drill rod 21, when drilling stops and the drill bit 22 is not cutting the coal and rock mass, no slag is discharged from the drill rod 21. When the drill rod 21 rotates to cut the coal and rock mass, the cut slag can be carried out of the borehole in a timely manner, which facilitates core sampling at a given point. It can accurately record the precise location of drill cuttings and discharge them in a timely manner through the cuttings outlet 41, enabling analysis and research on the basic conditions of coal and rock masses; Fourth, when the drill cuttings discharged by the air amplifier 31 and the positive pressure medium detach from the drill rod 21, they enter the drill cuttings dry-wet separator 4. By opening the water inlet 44, the dust removal nozzle 45 is atomized, and a large amount of water mist captures the dust and falls onto the dry-wet separation tank 47. The pneumatic motor 48 installed on the dry-wet separation tank 47 drives the spiral blade 473 to rotate on the guide rod 472, gradually squeezing the dry and wet drill cuttings into the filter device 474. Under the joint squeezing of the spring pressure plate 475 and the spiral blade 473, the water in the drill cuttings is discharged through the filter hole 478. As the pneumatic motor 48 drives the spiral blade 473 to continue rotating, the drill cuttings with squeezed water continue to move towards the end until they are discharged from the drill cuttings dry-wet separator through the cuttings outlet 476, thus achieving the separation of cuttings and water.

[0067] Any aspects of this invention not described in detail are well-known to those skilled in the art.

[0068] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An internal slag discharge device, characterized in that: It includes a high wear-resistant plug (1), a drill bit and drill rod assembly (2), a Venturi water braid (3), and a drill cuttings dry and wet separator (4). The drill bit and drill rod assembly (2) is located inside the high wear-resistant plug (1), and the drill cuttings dry and wet separator (4) is connected to the drill bit and drill rod assembly (2) through the Venturi water braid (3). The high wear-resistant plug (1) has a conical structure. The high wear-resistant plug (1) includes a body (11), a medium channel (12) is provided on the body (11), a drill bit and drill rod channel (13) is in the middle of the body (11), and several fish scale baffles (14) are provided on the inner axis of the drill bit and drill rod channel (13). The medium channel (12) is located on the side wall of the body (11), and a slag discharge medium is connected to the outside of the medium channel (12) through a pipe. The materials of the body (11) and the fish scale baffles (14) are high wear-resistant and antistatic elastic materials. The drill bit and drill rod assembly (2) includes a drill rod (21) and a drill bit (22). The drill rod (21) and the drill bit (22) are connected by threads. The drill rod (21) is located inside the body (11) and is wrapped by a fish-scale baffle (14) inside the body (11). The drill rod (21) is a single section or a multi-section structure that is threaded together. The drill bit (22) includes a cutting blade (221) and a drill body (226). The cutting blade (221) is fixedly connected to the front end of the drill body (226). The rear end of the drill body (226) is provided with a connecting female head (225) and is movably connected to the male head (214) of the drill rod (21) through the connecting female head (225). A cuttings inlet (223) is provided on the front side wall of the drill body (226), and a cuttings discharge medium outlet (222) is provided on the rear side wall of the drill body (226). A cuttings channel (224) is provided in the middle of the drill body (226). The cuttings channel (224) is connected to the inner tube (212) through the cuttings inlet (223). The inner tube (212) is connected to the cuttings dry and wet separator (4). The cuttings discharge medium outlet (222) is connected to the interlayer between the outer tube (211) and the inner tube (212). The Venturi-type water braid (3) includes an air amplifier (31), a water braid (32), and a medium inlet (33). The air amplifier (31) and the water braid (32) are directly connected. The medium inlet (33) is a three-way structure and is connected to the side walls of the air amplifier (31) and the water braid (32) respectively. The slag discharge medium can enter the air amplifier (31) and the water braid (32) respectively through the medium inlet (33). A male thread (34) is provided at the end of the water braid (32). The Venturi-type water braid (3) is detachably connected to the female end (215) of the drill pipe (21) via a male thread (34). The water braid (32) is a double-layer cylindrical structure. The outer layer is a male thread (34), and the inner layer is a round tube (35) connected to the inner tube (212) of the drill pipe (21). The other end of the round tube (35) is connected to the air amplifier (31). The air amplifier (31) is a Venturi structure. The medium inlet (33) is connected to the interlayer of the air amplifier (31) and the drill pipe (21) respectively.

2. The internal slag discharge device according to claim 1, characterized in that: The drill rod (21) includes an outer tube (211) and an inner tube (212). The inner tube (212) is located inside the outer tube (211) and connected by a retainer (213). The outer tube (211) has a male head (214) and a female head (215) at both ends. The outer tube (211) and the inner tube (212) together form a double-layer ring structure. The drill rod (21) is connected to the drill bit (22) or to the female head (215) of another section of the drill rod (21) through the male head (214).

3. The internal slag discharge device according to claim 1, characterized in that: The drill cuttings dry and wet separator (4) is a box structure. Support legs (40), a slag inlet pipe (42) and a water inlet (44) are respectively provided on the drill cuttings dry and wet separator (4). The drill cuttings dry and wet separator (4) is connected to the outlet of the air amplifier (31) through the slag inlet pipe (42). The slag inlet pipe (42) is located at the top of the drill cuttings dry and wet separator (4) and is respectively provided with a slag separation port (41) and a blowout preventer (43). The blowout preventer (43) is connected to the gas extraction pipe through a pipe. Several dust removal nozzles (45) are respectively provided in the drill cuttings dry and wet separator (4) and are connected to the water inlet (44). An observation port (46) is provided on the side wall of the drill cuttings dry and wet separator (4). A dry and wet separation water tank (47) is provided at the bottom of the box.

4. The internal slag discharge device according to claim 3, characterized in that: The bottom of the slag inlet pipe (42) is provided with a slag separation port (41). A valve is provided on the slag inlet pipe (42). The slag channel is changed by controlling the valve. The slag enters the slag inlet pipe (42) for dry and wet separation. The slag inlet pipe (42) is closed and the core is taken from the slag separation port (41) at a fixed point.

5. The internal slag discharge device according to claim 3, characterized in that: The dry-wet separation tank (47) includes a receiving tank (471), a filter device (474), and a pneumatic motor (48). The receiving tank (471) is connected to the bottom of the drill cuttings dry-wet separator (4). The two ends of the receiving tank (471) are connected to the filter device (474) and the pneumatic motor (48) respectively through flanges (477). Several spiral blades (473) are set inside the receiving tank (471) and the filter device (474). The spiral blades (473) are connected to the shaft of the pneumatic motor (48) through guide rods (472). Several filter holes (478) are set at the bottom of the filter device (474). Several screws are set at the end of the filter device (474). Spring pressure plates (475) are set on the screws. The bottom of the spring pressure plates (475) is the slag outlet (476). The size of the slag outlet (476) can be adjusted by the screws.

6. The slag discharge method of the internal slag discharge device according to any one of claims 1-5, characterized in that: The steps of the method are as follows: First, before drilling, use a reaming drill bit to enlarge the borehole to be drilled, and put the high wear-resistant plug (1) into the borehole enlargement section and press it against the borehole wall to form a reliable whole; Second, during drilling, inject the slag discharge medium into the medium channel (12) and the medium inlet (33) respectively. The fish scale baffle (14) can effectively block the slag discharge medium from overflowing from the borehole opening and continuously deliver the slag discharge medium into the borehole, forcing the pressure difference between the inside and outside of the hole to increase and changing the flow direction of the slag discharge medium. Ultimately, slag is discharged from the inner layer of the double-layer drill rod, and slag discharge medium enters the medium channel (12) of the high wear-resistant plug (1), and slag discharge medium enters between the drill rod and the drill rod channel; Third, during the process of slag being discharged through the drill rod (21), when the drilling bit (22) stops cutting the coal and rock, no slag is discharged from the drill rod (21). When the drill rod (21) rotates to cut the coal and rock, the cut slag can be carried out of the hole in time, which facilitates core sampling at a given point and allows for accurate recording. The accurate location of the drill cuttings, and timely discharge of the drill cuttings through the cuttings outlet (41), allows for analysis and research of the coal and rock mass. Fourth, when the drill cuttings discharged by the air amplifier (31) and positive pressure medium detach from the drill rod (21), they enter the drill cuttings dry-wet separator (4). By opening the water inlet (44), the dust removal nozzle (45) is atomized, and a large amount of water mist captures the dust and falls onto the dry-wet separation tank (47). The pneumatic motor (48) installed on the dry-wet separation tank (47) drives the screw... The rotary blade (473) rotates on the guide rod (472), gradually squeezing the dry and wet drill cuttings into the filter device (474). Under the joint squeezing of the spring pressure plate (475) and the rotary blade (473), the water in the drill cuttings is discharged through the filter hole (478). As the pneumatic motor (48) drives the rotary blade (473) to rotate continuously, the drill cuttings that have been squeezed out of water continue to move towards the end until they are discharged from the drill cuttings dry and wet separator through the slag outlet (476), thus achieving slag-water separation.

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