Tubular retreating type hydraulic cave-making and spray-eliminating drilling tool for outburst coal seam crossing drilling

Abstract

The invention discloses an outburst coal seam crossing drilling pipe retreating type hydraulic cave forming and spray eliminating drilling tool. The drilling tool comprises a pipe retreating type anti-blocking drill bit, a pipe retreating type spray eliminating device, a pipe retreating type jet device and a double-channel drill rod which are connected in sequence. An annular flow supply channel flowing towards the pipe retreating type anti-blocking drill bit and an exhaust pipe planting channel with the flow direction opposite to that of the annular flow supply channel are arranged in the pipe retreating type anti-blocking drill bit, the pipe retreating type spray eliminating device, the pipe retreating type jet device and the double-channel drill rod. A radial gas inlet channel for external gas to enter the exhaust pipe planting channel is further formed in the pipe retreating type spraying eliminating device; the device has the beneficial effects that by utilizing the stress characteristics that drilling thrust exists during drilling and drilling thrust does not exist during hole making, a sliding drill bit and a plurality of linked retreating pipes are adopted to replace a flow control slide valve of which the switching action depends on water pressure control; switching of axial drill bit flow supply and radial hole forming flow supply is not interfered and limited by the water pressure, the drilling depth and the drilling inclination angle, and flow direction switching of drilling and hole forming is easier to achieve.

Description

Technical Field

[0001] The invention relates to the technical field of gas extraction drilling, permeability enhancement and blowout prevention in a protruding coal seam, and in particular to a through-layer drilling and pipe-retracting hydraulic hole-making and blowout prevention drilling tool for a protruding coal seam. Background Art

[0002] The through-layer drilling of the protruding coal seam is the main drilling hole for preventing coal seam outbursts in the protruding coal seam area. Through-layer drilling is used to construct through-layer drilling holes in the area to be excavated or mined in the protruding coal seam, and hydraulic punching and hole-making are implemented in the coal hole section of the through-layer drilling hole to increase permeability. This is a common permeability enhancement measure for gas extraction in the protruding coal seam. In order to prevent the gas from exceeding the limit in the through-layer drilling hole, the traditional practice is to install a blowout prevention hole system composed of a four-way, a hose, a box, an air bag, etc. at the hole mouth. Its function is to prevent the gas generated by the blowout hole from overflowing into the tunnel space as much as possible, so as to prevent the gas from exceeding the limit in the blowout hole. The existing off-hole blowout prevention system can cope with most blowout phenomena and avoid the occurrence of blowout gas exceeding the limit accidents. However, it is still difficult to avoid blowout gas exceeding the limit accidents in the gas abnormal zone. The blowout in the gas abnormal zone is violent. The severe blowout phenomenon will cause four-way leakage, hose detachment, hose thread drawing, box damage, airbag rupture and other destructive phenomena, which will lead to blowout gas exceeding the limit accidents. In addition, the existing off-hole blowout prevention system does not work for delayed blowout after drilling back, and the scale and harm of delayed blowout are greater. There are cases showing that delayed blowout can spray tens of tons or even hundreds of tons of coal slag and thousands of cubic meters or even tens of thousands of cubic meters of gas in a very short period of time. The same borehole may also have a second delayed blowout the next day.

[0003] Aiming at the problem of orifice blowout in oblique through-layer drilling in gas anomaly zones of protruding coal seams, the applicant has conducted a lot of theoretical exploration. In order to reveal the mechanism of orifice blowout in gas anomaly zones and reasonably explain the orifice blowout phenomenon, the applicant has proposed three new concepts, namely "loose hole gas bag", "restricted outburst" and "gas blocking plug", referred to as "loose hole gas bag outburst blocking hypothesis". "Loose hole gas bag" means: a quasi-filled cave containing gas storage space composed of loose fracture zones and cave zones formed by cavitation in coal hole section. "Restricted outburst" means: intermittent small-scale outbursts constrained by limited space occurring in "loose hole gas bag". "Gas blocking plug" means: annular plugs or cylindrical plugs formed by water coal slag or dry coal slag entering the rock hole section of through-layer drilling under the action of oblique self-weight, which delay gas leakage. There are two types of gas blocking plugs: drilled gas blocking plugs and non-drilled gas blocking plugs. Based on the "Songdong Gas Bag Sudden Blockage Hypothesis", two important inferences are drawn: First, if the gas blocking effect of the "gas blocking plug" in the rock hole section can be eliminated, the energy-gathering and pressure-increasing trend of the "Songdong Gas Bag" can be blocked, thereby eliminating the risk of excessive gas in the blowhole; second, the design and invention of dual-channel special drilling tools can eliminate the gas blocking effect of the "gas blocking plug" in the borehole throughout the entire process, and it is possible to eliminate blowouts during the entire process. The meaning of eliminating blowouts during the entire process has two levels: enabling the drilling tool to have the function of gas drainage while drilling, relying on the exhaust of the drill pipe to eliminate the gas blocking effect of the gas blocking plug, and eliminating the risk of blowouts during hydraulic punching and cavitation, referred to as "eliminating blowouts while drilling"; enabling the drilling tool to have the function of planting a pipe with the withdrawal of the drill before the withdrawal of the drill to implant a gas-guiding screen tube, relying on the exhaust of the planting pipe to eliminate the gas blocking effect of the gas blocking plug, and eliminating the risk of blowouts and delayed blowouts during the withdrawal of the drill, referred to as "planting pipe elimination of blowouts".

[0004] In order to realize the above-mentioned anti-blowout hole method relying on the structural characteristics of the drilling tool, the applicant has applied for a number of related patents, mainly including "Through-layer drilling extraction drilling tool and anti-blowout hole gas extraction method while drilling" (application number CN2022102513533.3), "Through-layer drilling ring flow supply self-cleaning and plugging split bottom hole extraction and blowout prevention drilling tool" (application number CN202310838603.8), "Protruding coal seam through-layer drilling hydraulic hole making and active blowout prevention integrated drilling tool" (application number CN202410340447.7), "Through-layer drilling ring flow supply self-cleaning and plugging integrated The first four patents involve problems such as hydraulic cavitation jet control valve, air intake and exhaust blowout elimination unit, etc., and there are still defects in the process of testing and use. From the perspective of continuous technological progress, new technologies generated by new theories, and the formation of a patent protection system for similar new technologies, the present invention intends to overcome the following defects of the applicant's patent application: First, the actual water pressure of the sliding valve assembly in the aforementioned invention is affected by three major factors: water supply pressure, drilling depth (pipeline resistance) and drilling inclination. The radial flow hydraulic cavitation function of the sliding valve assembly can only be achieved by relying on a stable and relatively high water supply pressure from the pump station. It cannot rely on the variable hydrostatic pressure determined by the mining depth, and it cannot utilize a relatively low hydrostatic pressure to achieve radial hydraulic cavitation. This is one of the common defects of the aforementioned inventions.

[0005] Second, the opening and closing of the sliding valve assembly is ultimately determined by the pressure difference. The opening of the sliding valve assembly in the aforementioned invention is not only related to the water supply pressure of the pump station, but also related to the gas-water pressure in the "Songdong gas bag". When the gas-water pressure in the "Songdong gas bag" is high, the sliding valve assembly will not switch the flow direction properly, and the sliding valve switching action will fail under special circumstances. This is the second common defect of the aforementioned invention. Summary of the invention

[0006] The purpose of the present invention is to propose a hydraulic cavitation and blowout prevention drilling tool for drilling holes through protruding coal seams. In view of the problems existing in the prior art, the flow control sliding valve that relies on water pressure to control the axial-radial flow supply switching is eliminated, and the axial drill bit flow supply and radial cavitation jet are controlled by the presence or absence of drilling top thrust. The flow direction switching of the axial drill bit flow supply and the radial cavitation flow supply is no longer restricted and interfered by the water supply pressure, drilling depth and drilling angle.

[0007] To achieve the above object, the present invention adopts the following technical solutions: A pipe-retracting hydraulic hole-making and blowout-eliminating drilling tool for drilling through a protruding coal seam, comprising a pipe-retracting anti-blocking drill bit, a pipe-retracting blowout-eliminating device, a pipe-retracting ejector and a dual-channel drill pipe connected in sequence; The inner parts of the pipe-retracting anti-blocking drill bit, pipe-retracting spray suppressor, pipe-retracting ejector and dual-channel drill pipe are provided with a ring supply channel for flowing to the pipe-retracting anti-blocking drill bit and an exhaust pipe channel for flowing in the opposite direction to the ring supply channel; The retreat-pipe type spray suppressor is also provided with a radial air inlet passage for external gas to enter the exhaust pipe passage.

[0008] Furthermore, the pipe-retracting anti-blocking drill bit comprises a hollow drill bit, a blade wing is arranged at the front end of the hollow drill bit, a sliding drill bit is inserted at the blade wing end of the hollow drill bit, and a movable first pipe-retracting component is installed in the hollow drill bit; The hollow drill bit is provided with drill bit water supply holes corresponding to the blade wings one by one.

[0009] Furthermore, the first withdrawal pipe assembly includes a first withdrawal pipe abutting against the sliding drill bit, the first withdrawal pipe is provided with a first flow ring supporting it in the hollow drill bit, a follower flow ring that can seal the drill bit water supply hole and a first return spring for pushing it to return, and a first sealing ring is provided at one end of the first withdrawal pipe.

[0010] Furthermore, the retreat-type spray suppressor includes an outer spray suppressor tube body, a flushing and anti-blocking system is installed on the tube wall of the outer spray suppressor tube body, a stepped air inlet groove is also opened on the tube wall of the outer spray suppressor tube body, and a second retreat-tube assembly and a special-shaped porous tube cooperating with the stepped air inlet groove are arranged in the outer spray suppressor tube body.

[0011] Furthermore, a flushing flow supply hole connected to the ring flow supply channel is opened on the side wall of the spray gun outer tube body, and the flushing flow supply hole is connected to the special-shaped groove through the buried pipe groove; The flushing and anti-blocking system includes a filter mesh, a mesh threaded cover that presses the filter mesh into the flushing flow supply hole, a thin tube installed in the buried pipe groove, a check block installed in the special-shaped groove, and a sieve hole air intake plate pressed onto the outside of the step air intake groove.

[0012] Furthermore, a fixed shut-off ring is provided on the inner wall of the outer tube body of the blowout suppressor, and the second withdraw pipe assembly includes a second withdraw pipe, on which a second flow ring and a third flow ring are provided to support it in the outer tube body of the blowout suppressor, a follow-up shut-off ring that can cooperate with the fixed shut-off ring to cut off the ring flow supply channel, and a second reset spring for pushing it to reset, and a second sealing ring is provided at one end of the second withdraw pipe.

[0013] Furthermore, the special-shaped porous tube has a central hole for the second retreat pipe to pass through and an arc-shaped convex rib abutting the inner wall of the step air inlet groove, the arc-shaped convex rib is provided with a through air inlet hole, and the side wall of the second retreat pipe is provided with an exhaust groove connected to the air inlet hole.

[0014] Furthermore, the withdrawn tube type ejector comprises a jet outer tube body and a third withdrawn tube assembly located inside the jet outer tube body, and a jet nozzle connected to the ring supply channel is provided on the side wall of the jet outer tube body; The third withdrawal tube assembly includes a third withdrawal tube, on which a fourth flow ring and a fifth flow ring are provided to support the third withdrawal tube in the jet outer tube body, and a third return spring is provided to push the third withdrawal tube to return. A third sealing ring is provided at one end of the third withdrawal tube.

[0015] Furthermore, a radial flow ring is installed on the inner wall of the jet outer tube, and a radial flow hole for supplying flow to the jet nozzle is opened on the radial flow ring; The third withdrawal pipe is provided with a follow-up limiting ring and a flow-through sliding ring cooperating with the radial flow-through ring, a slip ring reset spring is provided between the follow-up limiting ring and the flow-through sliding ring, and an oblique flow-through hole is opened on the flow-through sliding ring.

[0016] Furthermore, a two-way flow ring is installed on the inner wall of the jet outer tube, and a radial flow hole for supplying flow to the jet nozzle is opened on the two-way flow ring; The third withdrawal pipe is provided with a follow-up limiting ring and a non-flowing sliding ring matched with a bidirectional flow-through ring, and a sliding ring reset spring is provided between the follow-up limiting ring and the non-flowing sliding ring.

[0017] The beneficial effects of the present invention are: 1. Taking advantage of the drilling tool stress characteristics that there is drilling thrust during drilling and there is no drilling thrust during hole making, a sliding drill bit and multiple linked withdrawal pipes are used to replace the flow control slide valve whose switching action depends on water pressure control, so that the switching of axial drill bit flow supply and radial hole making flow supply is not affected or restricted by the water pressure, drilling depth and drilling inclination, and the flow direction switching of drilling and hole making is easier to achieve.

[0018] 2. The first, second and third retracting tubes are all provided with reset springs. During the drilling process, the sliding drill bit pushes the retracting tube to move. When the drilling stops, the reset springs can realize the automatic reset of the first, second and third retracting tubes.

[0019] 3. A radial flow ring or a bidirectional flow ring can be installed on the inner wall of the jet outer tube, and a flow sliding ring or a non-flow sliding ring matching with the radial flow ring can be arranged on the third retreat tube to improve the application range of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the overall structure diagram of the pipe-retracting hydraulic cavitation and blowout prevention drilling tool; Figure 2 This is a structural illustration of a tube-retracting anti-blocking drill bit; Figure 3 It is a three-dimensional composition diagram of the flushing and anti-blocking system; Figure 4 This is a structural diagram of the spray gun outer tube; Figure 5 It is the structural diagram of the special-shaped porous tube; Figure 6 It is a diagram of the assembly method of the second withdrawal tube assembly; Figure 7 This is a schematic diagram of the assembly and workstation of the retreat-type blowout suppressor; Figure 8 Schematic diagram of the structure of the jet outer tube in Example 1; Fig. 9 This is a diagram showing the assembly method of the third pipe withdrawal assembly in the first embodiment; Fig.10 The assembly diagram of the retreat-tube ejector and three workstation diagrams in Example 1; Fig.11 The assembly diagram of the pipe-retracting type hole-making and blowout-eliminating drilling tool and three workstation diagrams in Example 1; Fig.12 The assembly diagram of the pipe-retracting type hole-making and blowout-eliminating drilling tool and three workstation diagrams in the second embodiment; Fig.13Schematic diagram of the structure of the jet outer tube in Example 3; Fig.14 This is a diagram showing the assembly method of the third pipe withdrawal assembly in the third embodiment; Fig.15 The following is a diagram of the assembly and three working positions of the retreating tube ejector in the third embodiment.

[0021] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings.

[0023] Embodiment 1 like Figure 1 As shown, the present embodiment of the protruding coal seam through-layer drilling and retreating pipe type hydraulic cavitation and blowout prevention drilling tool comprises a retreating pipe type anti-blocking drill bit 1, a retreating pipe type blowout suppressor 2, a retreating pipe type ejector 3 and a dual-channel drill pipe 7 which are sequentially connected by threads; The pipe-retracting anti-blocking drill bit 1, the pipe-retracting spray suppressor 2, and the pipe-retracting ejector 3 all include different outer tube bodies and inner pipe-retracting tubes, each of which is connected to the outer tube body and the inner pipe-retracting tube. The space between the outer tube body and the inner pipe-retracting tube is a ring supply channel 4. The flow direction of the medium (generally water) in the ring supply channel 4 is to flow toward the pipe-retracting anti-blocking drill bit 1. The central hole of the inner pipe-retracting tube is an exhaust pipe channel 5. The flow direction of the medium (generally gas) in the exhaust pipe channel 5 is opposite to that of the medium in the ring supply channel 4. The retreat-pipe type blowout suppressor 2 is also provided with a radial air inlet passage 6 for external gas to enter the exhaust pipe passage 5.

[0024] In this embodiment, during the drilling process, the inner retractable tubes of the retractable anti-blocking drill bit 1, the retractable blowout suppressor 2, and the retractable ejector 3 can all move backward under the action of the drilling thrust, and can move forward and reset after the drilling is stopped; however, the inner tube of the dual-channel drill pipe 7 cannot move forward and backward.

[0025] like Figure 2 As shown, FIG. a is a schematic diagram of a hollow drill bit 11, and the tube-retracting anti-blocking drill bit 1 comprises a hollow drill bit 11, a blade wing is arranged at the front end of the hollow drill bit 11, a sliding drill bit 12 is inserted at the blade wing end of the hollow drill bit 11, and a movable first tube-retracting component 13 is installed in the hollow drill bit 11; The hollow drill bit 11 is provided with drill bit water supply holes 111 corresponding to the blade wings one by one. During the drilling process, the water in the ring flow channel 4 flows out along the drill bit water supply holes 111 to clean and cool the blade wings.

[0026] The sliding drill bit 12 is a disposable lost drill bit. After the drilling construction is completed, the drill is not withdrawn, and the screen pipe is directly inserted from the left end of the exhaust pipe channel 5. The screen pipe moves rightward to push the sliding drill bit 12 into the coal seam, so that it is lost in the coal seam.

[0027] Figure 2 -b is a schematic diagram of the first withdrawal tube assembly 13, which includes a first withdrawal tube 133 abutting against the sliding drill bit 12, and is provided with a first flow ring 132 supporting it in the hollow drill bit 11, a follower flow ring 135 that can block the drill bit water supply hole 111, and a first reset spring 134 for pushing it to reset, and a first sealing ring 131 is provided at the left end of the first withdrawal tube 133. In this embodiment, the first reset spring 134 is a compression spring, which is sleeved on the outside of the first withdrawal tube 133, and its two ends are respectively in contact with the first flow ring 132 and the follower flow ring 135, and the follower flow ring 135 is fixedly connected to the first withdrawal tube 133 and can move left and right along the inner wall of the hollow drill bit 11. The first flow ring 132 is clamped in the limiting step in the hollow drill bit 11, and the first withdrawal tube 133 can reciprocate in the first flow ring 132. When the first retreat pipe 133 moves to the left, pressure is applied to the first return spring 134 through the follower flow ring 135, so that the first return spring 134 is compressed and deformed.

[0028] like Figure 2 -c, during the drilling process, under the action of the drilling thrust, the sliding drill bit 12 retreats to the left about 10 mm, and the first retreat pipe 133 and the follow-up flow ring 135 move to the left accordingly. At this time, the follow-up flow ring 135 no longer blocks the drill bit water supply hole 111, and the water in the ring supply channel 4 can flow out along the drill bit water supply hole 111.

[0029] like Figure 2 -d, in the non-drilling process (including stop-drilling and hydraulic jetting), the drilling thrust disappears, the first return spring 134 pushes the first withdrawal pipe 133 and the follow-up flow ring 135 to move rightward, and the follow-up flow ring 135 blocks the drill bit water supply hole 111 to prevent coal slag from entering the ring flow channel 4. In this process, coal slag is allowed to enter the drill bit water supply hole 111, because experiments show that the coal slag in the drill bit water supply hole 111 is easy to flush, but the coal slag is not allowed to enter the ring flow channel 4, and the coal slag entering the ring flow channel 4 is easy to bridge and block the entrance of the drill bit water supply hole 111.

[0030] like Figure 3 — Figure 6 As shown, the retreat-type spray suppressor 2 includes an outer spray suppressor tube body 22, on the tube wall of which a flushing and anti-blocking system 21 is installed, on the tube wall of the outer spray suppressor tube body 22 a stepped air inlet groove 224 is also provided, and inside the outer spray suppressor tube body 22 a second retreat-tube assembly 24 and a special-shaped porous tube 23 cooperating with the stepped air inlet groove 224 are provided.

[0031] The side wall of the spray-out outer tube body 22 is provided with a flushing flow supply hole 221 connected to the ring flow supply channel 4, and the flushing flow supply hole 221 is connected to the special-shaped groove 223 through the buried pipe groove 222; The flushing and anti-blocking system 21 includes a filter mesh 211, a mesh thread cover 212 that presses the filter mesh 211 into the flushing flow hole 221, a capillary tube 213 installed in the buried pipe groove 222, a check block 214 installed in the special-shaped groove 223, and a sieve hole air intake plate 216 that is pressed onto the outside of the step air intake groove 224. The sieve hole air intake plate 216 can be fixed to the step air intake groove 224 by welding, and the check block 214 can be fixed to the special-shaped groove 223 by a pressing cover 215. After the capillary tube 213 is installed into the buried pipe groove 222, the exposed section of the capillary tube 213 is covered by surfacing and grinding, so that the surface of the first outer tube body 22 is smooth.

[0032] In this embodiment, the capillary 213 is made of stainless steel and the check block 214 is made of rubber and plastic. When water flows forward along the annular flow channel 4, it will flow out along the capillary 213 and the check block 214 to flush the surface of the sieve hole air inlet plate 216 to prevent blockage.

[0033] The inner wall of the spray-extinguishing outer tube body 22 is provided with a fixed intercepting ring 225, and the second retreating tube assembly 24 includes a second retreating tube 243, on which are provided a second flow-through ring 242 and a third flow-through ring 246 supporting the second retreating tube 243 in the spray-extinguishing outer tube body 22, a follower intercepting ring 245 that can cooperate with the fixed intercepting ring 225 to intercept the ring supply flow channel 4, and a second return spring 244 for pushing it to return, and a second sealing ring 241 is provided at the left end of the second retreating tube 243. In this embodiment, the second return spring 244 is a compression spring, such as Figure 7 -a, it is sleeved on the outer side of the second retreat tube 243. When the second retreat tube 243 moves to the left, pressure is applied to the second return spring 244, causing it to be compressed and deformed.

[0034] The special-shaped porous tube 23 has a central hole 231 for the second retreat tube 243 to pass through, and an arc-surface convex rib 232 that abuts against the inner wall of the stepped air inlet groove 224. During installation, the stepped air inlet groove 224 and the arc-surface convex rib 232 are provided at two locations and correspond to each other. The special-shaped porous tube 23 and the spray gun outer tube body 22 are welded together by welding and sealing, so that the radial air inlet channel and the axial flow supply channel are isolated and sealed. Before welding, attention should be paid to the coaxial positioning problem to ensure that the central hole 231 for the tube is located at the axial center position. A through air inlet hole 233 is provided on the arc-surface convex rib 232, and an exhaust groove 2431 connected to the air inlet hole 233 is provided on the side wall of the second retreat tube 243. The air inlet hole 233 is Figure 1 The radial air inlet passage 6 in the.

[0035] The second retreat pipe 243 seals and slides in the central hole 231 of the pipe, and corresponding sealing rings, wear-reducing sleeves, slag prevention rings, etc. need to be provided to reduce friction resistance as much as possible while ensuring sealing. At the same time, it is also necessary to consider issues such as clearance fit based on the minimum air intake aperture of the sieve hole air intake plate 216. There are many variables here, so this embodiment will not be described in detail. Only two sealing rings are used in the drawings for simple replacement.

[0036] like Figure 7 -a is an assembly and drilling station diagram of the retreat pipe type blowout suppressor. Under the action of drilling thrust, the first retreat pipe 133 moves left and backward, thereby driving the second retreat pipe 243 to retreat, the follow-up intercepting ring 245 to move backward and separate from the fixed intercepting ring 225, and the second return spring 244 to be compressed. At this time, water flows along the ring supply channel 4 to supply flow to the drill bit axially.

[0037] like Figure 7 -b is a diagram of the assembly of the withdrawn-tube blowout suppressor and the hydraulic jet cavitation / stop-drilling workstation. After the drilling thrust disappears, the second return spring 244 and the first return spring 134 extend and return to their original positions, pushing the second withdrawn tube 243 and the first withdrawn tube 133 to move rightward, and the follower shut-off ring 245 moves forward into the fixed shut-off ring 225, stopping the axial flow supply to the drill bit.

[0038] like Figure 8 and Fig. 9 As shown, the ejector 3 includes an ejector outer tube body 31 and a third ejector assembly 32 located inside the ejector outer tube body 31. The side wall of the ejector outer tube body 31 is provided with two ejector nozzles 33 connected with the ring supply channel 4. The third withdrawal tube assembly 32 includes a third withdrawal tube 323, on which a fourth flow ring 322 and a fifth flow ring 328 are provided to support the third withdrawal tube 323 in the jet outer tube body 31, and a third return spring 324 is provided to push the third withdrawal tube 323 to return to its original position. A third sealing ring 321 is provided at the left end of the third withdrawal tube 323. The third return spring 324 is a compression spring, such as Fig. 9 As shown, it is sleeved on the outer side of the third retreat tube 323. When the third retreat tube 323 moves to the left, pressure is applied to the third return spring 324, causing it to be compressed and deformed.

[0039] The right end of the first withdrawal tube 133 abuts against the sliding drill bit 12, and the left end is connected to the right end of the second withdrawal tube 243 through the first sealing ring 131. The left end of the second withdrawal tube 243 is connected to the right end of the third withdrawal tube 323 through the second sealing ring 241. The left end of the third withdrawal tube 323 is connected to the inner tube of the dual-channel drill pipe 7 through the third sealing ring 321. Fig.12 -c, there is a certain gap at the connection between the dual-channel drill pipe 7 and the third sealing ring 321, and the length of the gap is greater than the leftward retreat distance of the first retreat pipe 133, the second retreat pipe 243, and the third retreat pipe 323.

[0040] A radial flow ring 311 is installed on the inner wall of the jet outer tube 31, and a radial flow hole for supplying flow to the jet nozzle 33 is opened on the radial flow ring 311; The third withdrawal pipe 323 is provided with a follow-up limit ring 327 and a flow-through sliding ring 325 cooperating with the radial flow-through ring 311 , a slip ring return spring 326 is provided between the follow-up limit ring 327 and the flow-through sliding ring 325 , and an oblique flow hole 3251 is opened on the flow-through sliding ring 325 .

[0041] like Fig.10 —a is an assembly and drilling station diagram of the withdrawn tube type ejector. Under the action of drilling thrust, the first withdrawn tube 133 and the second withdrawn tube 243 move left and backward, thereby driving the third withdrawn tube 323 to retract and the third return spring 324 to compress, and the through-flow sliding ring 325 moves left to close the flow supply channel of the jet nozzle 33. The medium water in the ring supply channel 4 is axially supplied to the withdrawn tube type ejector and the drill bit direction through the oblique through-flow holes 3251 on the through-flow sliding ring 325.

[0042] like Fig.10 —b shows the assembly and hydraulic jet cavitation workstation diagram of the withdrawn tube type ejector. When the drilling thrust disappears, the third return spring 324 extends and pushes the third withdrawn tube 323 and the flow-through sliding ring 325 to move forward to the right. At the same time, the water pressure in the ring supply channel 4 overcomes the pressure of the sliding ring return spring 326, so that the supply channel of the jet nozzle 33 is opened and hydraulic jet cavitation is performed.

[0043] like Fig.10 —c is the assembly and stop-drilling position diagram of the withdrawn tube type ejector. The drilling thrust disappears, and there is no fluid supply in the ring supply channel 4. The slip ring reset spring 326 pushes the through-flow sliding ring 325 to move to the left, closing the flow channel of the jet nozzle 33 to prevent coal slag from entering the drill pipe through the jet nozzle 33. When the drilling inclination angle is large, the slip ring reset spring 326 can be cancelled, which is also within the protection scope of the present application. (When the inclination angle is large, even if there is no reset spring 326, the through-flow sliding ring 325 can close the jet nozzle 33 under the action of its own weight. The inclination angle is mainly determined by the mass material of the through-flow sliding ring 325 and the material of the third withdrawn tube 323. The through-flow sliding ring 325's own gravity is required to overcome the friction between it and the third withdrawn tube 323).

[0044] like Fig.11 —a is an assembly and drilling station diagram of the retreat-tube type hole-making and blowout-eliminating drill tool. Under the action of the drilling thrust, the sliding drill bit 12, the first retreat tube 133, the second retreat tube 243 and the third retreat tube 323 retreat in a linked manner; the follow-up flow ring 135 retreats to open the drill bit water supply hole 111, and the follow-up intercepting ring 245 separates from the fixed intercepting ring 225 to open the drill bit axial flow supply; the flow sliding ring 325 retreats to the limit position to close the jet nozzle 33.

[0045] Fig.11 -b is the assembly diagram of the retreat-tube type hole-making and blowout-eliminating drill tool and the hydraulic jet hole-making workstation diagram. When the drilling thrust disappears, the first return spring 134, the second return spring 244 and the third return spring 324 extend in conjunction and drive the first retreat tube 133, the second retreat tube 243 and the third retreat tube 323 to move forward in conjunction, the sliding drill bit 12 extends, the follow-up flow ring 135 moves forward to close the drill bit water supply hole 111, and the follow-up intercepting ring 245 overlaps with the fixed intercepting ring 225 to close the drill bit axial flow supply; the flow sliding ring 325 moves forward, and the jet nozzle 33 opens.

[0046] Fig.11 -c is the assembly and stop-and-retract drilling position diagram of the withdrawn-tube type hole-making and blowout-eliminating drill tool. When the drilling is stopped and withdrawn, the drilling thrust disappears and the water supply stops. The first return spring 134, the second return spring 244 and the third return spring 324 are extended in conjunction with each other and move forward with the first withdrawn tube 133, the second withdrawn tube 243 and the third withdrawn tube 323 in conjunction. The sliding drill bit 12 extends out, and the follow-up flow ring 135 moves forward to close the drill bit water supply hole 111. The follow-up intercepting ring 245 overlaps with the fixed intercepting ring 225. The flow sliding ring 325 moves backward under the action of the return spring 326 to close the jet nozzle 33, thereby preventing coal slag from entering the drill pipe through the jet nozzle 33. It should be noted here that in order to prevent the sieve hole air inlet plate 216 from being blocked by coal slag mud, the flushing and anti-blocking system 21 will always flush the sieve hole air inlet plate 216 to prevent blockage during drilling and hole making as long as there is fluid supply. Due to the presence of the check block 214, there is no need to worry about the backflow of water and coal slag during the period of stopping and retracting drilling.

[0047] Embodiment 2 In this embodiment, the retreat type spray suppressor 2 and the retreat type ejector 3 are processed into one piece. That is: the spray-extinguishing outer tube body 22 and the jet outer tube body 31 are processed as one piece, the second retreat pipe 243 and the third retreat pipe 323 are processed as one piece, and the various components thereon remain unchanged (the second sealing ring 241 and the second return spring 244 can be cancelled, and the specific number of the second flow ring 242, the third flow ring 246, the fourth flow ring 322, and the fifth flow ring 328 can be selected according to the length and weight of the rod body to ensure the normal operation of the equipment).

[0048] The other structures of this embodiment are consistent with those of the first embodiment.

[0049] like Fig.12 As shown in FIG. 1 , it is the assembly and drilling station diagram of the integrated pipe-retracting type hole-making and blowout-eliminating drilling tool. Fig.12 -b is the assembly diagram of the integrated pipe-retracting hole-making and blowout-eliminating drilling tool and the hydraulic jet hole-making workstation diagram, Fig.12-c is the assembly and stop-drilling workstation diagram of the integrated pipe-retracting type hole-making and blowout-eliminating drilling tool. The specific working process of each workstation is consistent with that of the first embodiment, and will not be described in detail in this embodiment.

[0050] Embodiment 3 In this embodiment, the structure of the retreating tube type ejector 3 is slightly adjusted, and other structures are consistent with those of the first embodiment.

[0051] like Fig.13 and Fig.14 As shown, a two-way flow ring 312 is installed on the inner wall of the jet outer tube 31. The two-way flow means that both axial and radial flow are possible. The two-way flow ring 312 is provided with radial flow holes for supplying flow to the jet nozzle 33. The third withdrawal pipe 323 is provided with a follow-up limiting ring 327 and a non-flowing sliding ring 329 cooperating with the two-way flow-through ring 312 , and a sliding ring return spring 326 is provided between the follow-up limiting ring 327 and the non-flowing sliding ring 329 .

[0052] The non-flow-through sliding ring 329 is used in conjunction with the aforementioned bidirectional flow-through ring 312. Compared with the structure in the first embodiment, both have advantages and disadvantages: The advantage of this embodiment is that the flow area is large, but the disadvantage is that due to the water quality problem in the coal mine, the slide valve may become stuck and fail to open or reset; The advantage of the first embodiment is that the inclined surface contacts and the sliding valve will not get stuck and cannot be opened or reset; the disadvantage is that the flow area is not as large as that of the present embodiment.

[0053] like Fig.15 —a shows the assembly and drilling station diagram of the withdrawn-tube type hole-making and blowout elimination drill tool. Under the action of drilling thrust, the first withdrawn tube 133 and the second withdrawn tube 243 move left and backward, thereby driving the third withdrawn tube 323 to retract and the third return spring 324 to compress, and the non-flow sliding ring 329 moves left to close the flow supply channel of the jet nozzle 33. The medium water in the annular flow supply channel 4 is axially supplied to the withdrawn-tube type blowout elimination device and the drill bit direction through the four annular gaps formed by the two-way flow ring 312 and the jet outer tube body 31.

[0054] like Fig.15 —b shows the assembly of the withdrawn-tube type cavitation and blowout elimination drill and the hydraulic jet cavitation workstation diagram. When the drilling thrust disappears, the third return spring 324 extends and pushes the third withdrawn tube 323 and the non-flow sliding ring 329 to move forward to the right. At the same time, the water pressure in the ring supply channel 4 overcomes the pressure of the sliding ring return spring 326, so that the supply channel of the jet nozzle 33 is opened and hydraulic jet cavitation is carried out.

[0055] like Fig.15—c shows the assembly and stop-and-retract drilling position diagram of the withdrawn-tube type hole-making and blowout-eliminating drill tool. The drilling thrust disappears, and there is no fluid supply in the ring flow channel 4. The slip ring reset spring 326 pushes the non-flow slip ring 329 to move to the left, closing the flow channel of the jet nozzle 33 to prevent coal slag from entering the drill pipe through the jet nozzle 33.

[0056] Embodiment 4 This embodiment is based on the fine-tuned retreat type ejector 3 in the third embodiment, and the retreat type spray suppressor 2 and the retreat type ejector 3 are processed into one body.

[0057] That is: the spray-extinguishing outer tube body 22 and the jet outer tube body 31 are processed as one piece, the second retreat pipe 243 and the third retreat pipe 323 are processed as one piece, and the various components thereon remain unchanged (the second sealing ring 241 and the second return spring 244 can be cancelled, and the specific number of the second flow ring 242, the third flow ring 246, the fourth flow ring 322, and the fifth flow ring 328 can be selected according to the length and weight of the rod body to ensure the normal operation of the equipment).

[0058] The other structures of this embodiment are consistent with those of the third embodiment.

[0059] In this embodiment, the integrated withdrawable-tube-type hole-making and blowout-eliminating drill tool also has three working stations. The specific stations and their working principles and working processes are consistent with those in the third embodiment and will not be described in detail in this embodiment.

[0060] The above embodiments do not impose any formal limitations on the shape, material, structure, etc. of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the protection scope of the technical solution of the present invention.

[0061] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection content of the present invention.

[0062] If the words "first", "second", etc. are used in this document to limit components, those skilled in the art should know that the use of "first" and "second" is only to facilitate the description of the present invention and simplify the description. Unless otherwise stated, the above words have no special meaning.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic hole-making and blowout-eliminating drilling tool for drilling holes through protruding coal seams, characterized by: It comprises a pipe-retracting anti-blocking drill bit (1), a pipe-retracting blowout suppressor (2), a pipe-retracting ejector (3) and a dual-channel drill pipe (7) which are connected in sequence; The said anti-blocking drill bit (1), the anti-blocking spray suppressor (2), the anti-blocking ejector (3) and the dual-channel drill rod (7) are provided with a ring supply channel (4) for flowing toward the anti-blocking drill bit (1) and an exhaust pipe channel (5) for flowing in the opposite direction to the ring supply channel (4); The retreat-type blowout suppressor (2) is also provided with a radial air inlet passage (6) for allowing external gas to enter the exhaust pipe passage (5).

2. The protruding coal seam through-drilling and pipe-retracting hydraulic hole-making and blowout-eliminating drilling tool according to claim 1 is characterized in that: The tube-retracting anti-blocking drill bit (1) comprises a hollow drill bit (11), a blade wing is arranged at the front end of the hollow drill bit (11), a sliding drill bit (12) is inserted into the blade wing end of the hollow drill bit (11), and a movable first tube-retracting component (13) is installed in the hollow drill bit (11); The hollow drill bit (11) is provided with drill bit water supply holes (111) corresponding one to one with the blade wings.

3. The protruding coal seam through-drilling and pipe-retracting hydraulic hole-making and blowout-eliminating drilling tool according to claim 2 is characterized in that: The first withdrawal tube assembly (13) comprises a first withdrawal tube (133) abutting against the sliding drill bit (12); the first withdrawal tube (133) is provided with a first flow ring (132) for supporting the first withdrawal tube in the hollow drill bit (11), a follower flow ring (135) capable of sealing the drill bit water supply hole (111), and a first return spring (134) for pushing the first withdrawal tube (133) to return; and a first sealing ring (131) is provided at one end of the first withdrawal tube (133).

4. The protruding coal seam through-drilling and pipe-retracting hydraulic hole-making and blowout-eliminating drilling tool according to claim 1 is characterized in that: The retreat-type spray suppressor (2) comprises a spray suppressor outer pipe body (22), a flushing and anti-blocking system (21) is installed on the pipe wall of the spray suppressor outer pipe body (22), a stepped air inlet groove (224) is also opened on the pipe wall of the spray suppressor outer pipe body (22), and a second retreat-pipe assembly (24) and a special-shaped porous pipe (23) matched with the stepped air inlet groove (224) are arranged in the spray suppressor outer pipe body (22).

5. The protruding coal seam through-drilling and pipe-retracting hydraulic hole-making and blowout-eliminating drilling tool according to claim 4 is characterized in that: The side wall of the spray-extinguishing outer tube body (22) is provided with a flushing flow supply hole (221) connected to the ring flow supply channel (4); the flushing flow supply hole (221) is connected to the special-shaped groove (223) through the buried pipe groove (222); The flushing and anti-blocking system (21) comprises a filter mesh (211), a mesh thread cover (212) crimping the filter mesh (211) into a flushing flow supply hole (221), a thin tube (213) installed in a buried pipe groove (222), a check block (214) installed in the special-shaped groove (223), and a sieve hole air intake plate (216) crimped onto the outside of the step air intake groove (224).

6. The protruding coal seam through-drilling and pipe-retracting hydraulic hole-making and blowout-eliminating drilling tool according to claim 5 is characterized in that: The inner wall of the blowout suppressor outer tube body (22) is provided with a fixed shutoff ring (225), the second withdrawing tube assembly (24) comprises a second withdrawing tube (243), the second withdrawing tube (243) is provided with a second flow-through ring (242) and a third flow-through ring (246) for supporting the second withdrawing tube (243) in the blowout suppressor outer tube body (22), a follower shutoff ring (245) that can cooperate with the fixed shutoff ring (225) to shut off the ring flow supply channel (4), and a second return spring (244) for pushing the second withdrawing tube (243) to return, and a second sealing ring (241) is provided at one end of the second withdrawing tube (243).

7. The protruding coal seam through-drilling and pipe-retracting hydraulic hole-making and blowout-eliminating drilling tool according to claim 6 is characterized in that: The irregular multi-hole tube (23) comprises a central through-tube hole (231) for the second retreat tube (243) to pass through, and an arc-surface convex rib (232) abutting against the inner wall of the stepped air inlet groove (224); a through air inlet hole (233) is formed on the arc-surface convex rib (232); and an exhaust groove (2431) communicating with the air inlet hole (233) is formed on the side wall of the second retreat tube (243).

8. The protruding coal seam through-drilling and pipe-retracting hydraulic hole-making and blowout-eliminating drilling tool according to claim 1 is characterized in that: The withdrawing tube type ejector (3) comprises an ejection outer tube body (31) and a third withdrawing tube assembly (32) located inside the ejection outer tube body (31); a ejection nozzle (33) communicating with the ring flow supply channel (4) is provided on a side wall of the ejection outer tube body (31); The third withdrawal tube assembly (32) comprises a third withdrawal tube (323), on which are provided a fourth flow ring (322) and a fifth flow ring (328) for supporting the third withdrawal tube (323) in the jet outer tube body (31), and a third return spring (324) for pushing the third withdrawal tube (323) to return to its original position, and a third sealing ring (321) is provided at one end of the third withdrawal tube (323).

9. The protruding coal seam through-drilling and pipe-retracting hydraulic hole-making and blowout-eliminating drilling tool according to claim 8 is characterized in that: A radial flow ring (311) is installed on the inner wall of the jet outer tube (31), and a radial flow hole for supplying flow to the jet nozzle (33) is provided on the radial flow ring (311); The third withdrawal pipe (323) is provided with a follow-up limit ring (327) and a flow-through sliding ring (325) cooperating with the radial flow-through ring (311); a slip ring return spring (326) is provided between the follow-up limit ring (327) and the flow-through sliding ring (325); and an oblique flow-through hole (3251) is provided on the flow-through sliding ring (325).

10. The protruding coal seam through-drilling and pipe-retracting hydraulic hole-making and blowout-eliminating drilling tool according to claim 8, characterized in that: A two-way flow ring (312) is installed on the inner wall of the jet outer tube (31), and a radial flow hole for supplying flow to the jet nozzle (33) is opened on the two-way flow ring (312); The third withdrawal tube (323) is provided with a follow-up limiting ring (327) and a non-flow-through sliding ring (329) that cooperates with the bidirectional flow-through ring (312), and a sliding ring return spring (326) is provided between the follow-up limiting ring (327) and the non-flow-through sliding ring (329).

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