Pipe-pushing 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-pushing type hydraulic cave-making and spray-eliminating drilling tool which comprises a pipe-planting drill bit, a pipe-pushing and spray-eliminating device, a pipe-pushing jet device, at least one pipe-pushing drill rod and a pipe-pushing hollow water braid which are connected in sequence. A flow supply channel flowing towards the pipe planting drill bit and an exhaust pipe planting channel with the flow direction opposite to that of the flow supply channel are arranged in the pipe planting drill bit, the pipe pushing spray eliminating device, the pipe pushing jet device, the pipe pushing drill rod and the pipe pushing hollow water braid. The hydraulic drilling machine has the beneficial effects that the mode of controlling axial flow supply of a drill bit and radial flow supply of a nozzle through water pressure of a pump is abandoned, switching between axial flow supply and radial flow supply is achieved through an oil pump of the hydraulic drilling machine and a hollow oil cylinder of a hollow water braid of a push pipe, and the hydraulic drilling machine is not affected by the water pressure, the drilling depth and the gas-water pressure in a loose hole gas pocket; radial cave forming can be achieved through water pressure of a clear water pump station, radial cave forming can be achieved through hydrostatic pressure if a soft outburst coal seam occurs, and accurate switching can be achieved.

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-pushing 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.

[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 scientifically 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: water coal slag or dry coal slag enters the rock hole section of the through-layer drilling under the action of its own weight to form an annular plug or cylindrical plug that delays gas leakage. There are two types of gas blocking plugs: drilled gas blocking plugs and undrilled 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. The meaning of eliminating blowouts during the entire process is twofold: 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 during and after 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 drill 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 split-type 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 self-cleaning and plugging integrated bottom hole extraction and blowout prevention drill tool" (application number CN202310830514.9) and the matching special drill rod "High-pressure sealing gas extraction drill rod for protruding coal seam through-layer drilling" (application number CN202310651841.8). The first three patents involve hydraulic cavitation jet control valve, air intake and exhaust blowout prevention unit and other issues. There are still defects in the process of testing and use. From the perspective of continuous technological progress and the formation of a patent protection system, the present invention intends to overcome the following defects that the applicant has applied for patents: 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 have flow direction switching problems. The failure of the sliding valve switching action under special circumstances is the second common defect of the aforementioned invention. Summary of the invention

[0006] The purpose of the present invention is to propose a push-tube hydraulic hole-making and blowout-eliminating drill for drilling holes through protruding coal seams. In view of the problems existing in the prior art, the sliding valve assembly relying on water pressure control is eliminated and replaced by a push-tube structure controlled by an oil cylinder. The flow direction switching of the axial drill bit flow supply and the radial nozzle flow supply is no longer restricted or 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 push-tube hydraulic hole-making and blowout-eliminating drilling tool for drilling through a protruding coal seam, comprising a pipe-planting drill bit, a push-tube blowout-eliminating device, a push-tube ejector, at least one push-tube drill rod and a push-tube hollow water braid connected in sequence; A flow supply channel for flowing toward the pipe planting drill bit and an exhaust pipe planting channel with a flow direction opposite to that of the flow supply channel are arranged inside the pipe planting drill bit, the pipe pushing spray eliminater, the pipe pushing ejector, the pipe pushing drill rod and the pipe pushing hollow water braid.

[0008] Further, the push-tube spray suppressor comprises a first outer tube body, a flushing and anti-blocking assembly is installed on the first outer tube body, and a first push-tube assembly and a short tube assembly are arranged in the first outer tube body; The side wall of the first outer tube body is provided with a flushing flow supply hole connected to the flow supply channel, the flushing flow supply hole is connected to the special-shaped groove through the buried pipe groove, and the side wall of the first outer tube body is also provided with a radial air inlet hole connected to the exhaust implant pipe channel; The flushing and anti-blocking component 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 installed on the radial air intake hole.

[0009] Furthermore, a fixed intercepting ring is provided on the inner wall of the first outer tube; The first push tube assembly includes a first push tube, which is provided with a first support ring supporting it in a first outer tube body, a first return spring pushing it to return to its original position, and a follow-up cut-off ring that can cooperate with a fixed cut-off ring to cut off the flow supply channel. A first sealing ring is also provided at one end of the first push tube.

[0010] Furthermore, the short tube assembly comprises a short tube, and a second supporting ring is provided on the short tube to support the short tube in the first outer tube body.

[0011] Further, the push-tube ejector comprises a second outer tube body, and a second push-tube assembly is arranged in the second outer tube body; A jet nozzle connected to the flow supply channel is opened on the side wall of the second outer tube body, a radial flow ring and a non-return limit ring are arranged inside the second outer tube body, and a radial flow hole connected to the jet nozzle is arranged on the radial flow ring.

[0012] Furthermore, the second push tube assembly includes a second push tube, on which a third support ring and a fourth support ring are provided for supporting the second push tube within the second outer tube body, the second push tube is also provided with a flow ring for sealing a radial flow hole, a non-return flow slide valve for contacting a non-return limit ring to cut off a flow supply channel, and a second return spring for pushing the second push tube to return, and a second sealing ring is also provided at one end of the second push tube.

[0013] Further, the push-tube drill rod comprises a third outer tube body, and a third push-tube assembly is arranged in the third outer tube body; The third push tube assembly includes a third push tube, on which a fifth support ring and a sixth support ring are provided to support the third push tube in a third outer tube body, and a third return spring is also provided on the third push tube to push the third push tube to return to its original position, and a third sealing ring is provided at one end of the third push tube.

[0014] Furthermore, the push tube hollow water braid includes a sleeve, and a hollow oil cylinder is arranged in the sleeve.

[0015] Furthermore, the sleeve is radially provided with a first oil pipe interface, a second oil pipe interface, a water inlet pipe interface and at least one graphite column, and the sleeve is also provided with a rotating sealing ring for isolating the internal media of the first oil pipe interface, the second oil pipe interface and the water inlet pipe interface.

[0016] Furthermore, the hollow oil cylinder comprises a multifunctional cylinder body, on which a first oil circuit connected to a first oil pipe interface, a second oil circuit connected to a second oil pipe interface, and a water inlet circuit connected to a water inlet pipe interface are arranged; A hollow push tube is arranged in the multifunctional cylinder body, and a piston for isolating the first oil circuit and the second oil circuit and a cylinder cover for sealing and limiting are arranged on the hollow push tube.

[0017] The beneficial effects of the present invention are: 1. Give up relying on pump water pressure to control the axial flow supply of the drill bit and the radial flow supply of the nozzle. Use the hydraulic drilling rig's own oil pump and rely on the hollow oil cylinder of the hollow water braid in the push tube to realize the switching of axial flow supply and radial flow supply. It is not affected by water pressure, drilling depth and gas-water pressure in the loose cave gas bag. The water pressure of the clean water pump station can be used to realize radial cavitation. In case of soft and protruding coal seams, hydrostatic pressure can also be used to realize radial cavitation, which can achieve precise switching.

[0018] 2. The first push tube, the second push tube and the third push tube are all provided with return springs. After the oil pump pushes the push tubes to move, when the oil pump is reset, the return springs can realize automatic reset of the first push tube, the second push tube and the third push tube.

[0019] 3. Inject oil into the hollow water braid in the push tube through the oil line to make the working process smooth; add water into the flow supply channel through the water inlet line to facilitate jet hole making or drilling flow supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 for Figure 1 This is the overall structural diagram of the hole-making and blowout-eliminating drilling tool; Figure 2 It is a structural schematic diagram of the flushing and anti-blocking component; Figure 3 is a schematic structural diagram of the first outer tube body; Figure 4 This is an assembly diagram of the flushing anti-blocking component and the first outer tube body; Figure 5 is a structural schematic diagram of a first push tube assembly; Figure 6 It is a structural schematic diagram of a short tube assembly; Figure 7 This is a schematic diagram of the assembly and workstations of the push-tube blowout suppressor; Figure 8 is a schematic diagram of the structure of the second outer tube; Fig. 9 is a three-dimensional structural diagram of the second push tube assembly; Fig.10 This is the assembly and work position diagram of the push tube ejector; Fig.11 This is a schematic diagram of the equipment and workstations for the push-tube drill pipe; Fig.12 It is a schematic diagram of the sealing method after the push pipe drill pipe is threadedly connected; Fig.13 It is the structural diagram of the sleeve; Fig.14 It is a structural schematic diagram of a hollow oil cylinder; Fig.15It is the schematic diagram of the general assembly and working condition of the push-tube hollow water braid; Fig.16 This is the linkage working diagram of the push-tube blowout suppressor and the push-tube ejector; Fig.17 It is the structure and working condition diagram of the integrated push-tube jet cavitation spray suppressor.

[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 push-tube hydraulic hole-making and blowout-eliminating drilling tool for drilling through the protruding coal seam of this embodiment comprises a planted pipe drill bit 1, a push-tube blowout eliminater 2, a push-tube ejector 3, a plurality of push-tube drill rods 4 and a push-tube hollow water braid 5 connected in sequence; in actual use, the number of push-tube drill rods 4 is determined by the drilling depth, the planted pipe drill bit 1 can be the same as the existing dual-channel planted pipe, and a dual-channel rotating opening and closing cover drill bit or a disappearing cover drill bit can be used, which will not be described in detail in this embodiment.

[0024] In this embodiment, the planting pipe drill bit 1, the push-pipe spray eliminater 2, the push-pipe ejector 3, the push-pipe drill rod 4 and the push-pipe hollow water braid 5 all include their own outer tube body and inner tube body. The outer tube bodies are connected to each other to form a flow supply channel 6 that flows to one side of the planting pipe drill bit 1. The inner tube bodies are connected to each other, and the center holes thereof form an exhaust planting pipe channel 7 that flows in the opposite direction to the flow supply channel 6.

[0025] When performing radial jet hole making, the inner tube bodies of the planting pipe drill bit 1, the pushing pipe spray eliminater 2, the pushing pipe ejector 3, the pushing pipe drill rod 4 and the pushing pipe hollow water braid 5 can be pushed forward by the oil pump, and the aforementioned inner tube bodies can automatically move backward and reset after the hole making is stopped.

[0026] like Figure 2 — Figure 6 As shown, the push-tube spray suppressor 2 includes a first outer tube body 22, a flushing and anti-blocking assembly 21 is installed on the first outer tube body 22, and a first push-tube assembly 23 and a short tube assembly 24 are arranged in the first outer tube body 22; The side wall of the first outer tube body 22 is provided with a flushing supply hole 221 connected to the supply channel 6, and the flushing supply hole 221 is connected to the special-shaped groove 223 through the buried pipe groove 222. The side wall of the first outer tube body 22 is also provided with four rows of radial air inlet holes 225 connected to the exhaust pipe channel 7, and each row has multiple radial air inlet holes 225; the first outer tube body 22 is also provided with four axial flow holes 226 and a central air inlet and exhaust hole 71, among which the axial flow holes 226 are the supply channel 6 of this section, and the central air inlet and exhaust hole 71 is the exhaust pipe channel 7 of this section.

[0027] The flushing and anti-blocking assembly 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 four sieve hole air intake plates 216 installed on four rows of radial air intake holes 225. The sieve hole air intake plate 216 can be fixed on the first outer tube body 22 by welding, and the pressing cover 215 can fix the check block 214 in the special-shaped groove 223. After the capillary tube 213 is installed in 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.

[0028] 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 flow supply channel 6, 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.

[0029] In this embodiment, the flushing and anti-blocking component 21 only performs flushing and anti-blocking on two of the four sieve hole air inlet plates 216. In other embodiments, 1 / 3 / 4 sieve hole air inlet plates 216 may also be cleared, which is also within the scope of protection of this patent.

[0030] The inner wall of the first outer tube body 22 is provided with a fixed intercepting ring 224; The first push tube assembly 23 includes a first push tube 233, on which are provided a first support ring 232 for supporting the first push tube 233 in the first outer tube body 22, a first return spring 234 for pushing the first push tube 233 to return to its original position, and a follower cut-off ring 235 that can cooperate with the fixed cut-off ring 224 to cut off the flow supply channel 6, and a first sealing ring 231 is also provided at one end of the first push tube 233. The follower cut-off ring 235 is fixed on the first push tube 233, and when the first push tube 233 moves rightward so that the follower cut-off ring 235 enters the fixed cut-off ring 224, the flow supply channel 6 is cut off, and water cannot continue to move forward to the drill bit over the follower cut-off ring 235, that is, the flow supply to the drill bit is stopped at this time. The first return spring 234 is a compression spring, the left end of which is fixed to the outer wall of the first push tube 233, and the right end is in contact with the inner wall of the first outer tube body 22. When there is no need for the follow-up shut-off ring 235 to cut off the flow supply channel 6, under the action of the first return spring 234, the first push tube 233 will drive the follow-up shut-off ring 235 to move left, so that the flow supply channel 6 resumes circulation.

[0031] The short tube assembly 24 includes a short tube 242 , and a second support ring 241 is provided on the short tube 242 to support the short tube 242 in the first outer tube body 22 .

[0032] like Figure 7 As shown, FIG. a shows an axial flow supply station (including drilling flow supply and stop drilling anti-backflow station), at which time the fixed interception ring 224 and the follower interception ring 235 are in a separated state, so that the flow channel is unobstructed, and flow can be supplied to the drill bit in the drilling condition to perform drilling operations; in the stop drilling condition, the work is stopped and no flow is supplied. FIG. b shows an axial flow interception station (i.e., radial jet cavitation station), and the follower interception ring 235 enters the fixed interception ring 224, and the two overlap to stop supplying flow to the drill bit.

[0033] like Figure 8 and Fig. 9 As shown, the push-tube ejector 3 comprises a second outer tube body 31, and a second push-tube assembly 32 is arranged in the second outer tube body 31; The side wall of the second outer tube 31 is provided with two jet nozzles 311 connected to the flow supply channel 6. A radial flow ring 312 and a non-return limit ring 313 are provided inside the second outer tube 31. The radial flow ring 312 is provided with a radial flow hole 3121 connected to the jet nozzle 311. When water flows forward along the flow supply channel 6, it can be jet-formed along the radial flow hole 3121 and the jet nozzle 311.

[0034] The second push tube assembly 32 includes a second push tube 323, on which a third support ring 322 and a fourth support ring 327 are provided to support the second push tube 323 in the second outer tube body 31, and a flow ring 324 that can block the radial flow hole 3121, a non-return flow slide valve 325 that can contact the non-return limit ring 313 to cut off the flow supply channel 6, and a second return spring 326 that pushes the second push tube 323 to return, and a second sealing ring 321 is also provided at one end of the second push tube 323. The flow ring 324 is fixed on the second push tube 323. The left end of the second return spring 326 is fixed to the outer wall of the second push tube 323, and the right end is limited by the fourth support ring 327.

[0035] In this embodiment, the second return spring 326 is a compression spring, and the non-return slide valve 325 is composed of a sliding ring and a universal sealing ring, a compression spring, a guide sleeve, a retaining ring and a retaining ring. When the implant drill bit has a non-return function, the non-return slide valve 325 can be cancelled. When the push-tube ejector is used in conjunction with the push-tube spray suppressor, the non-return slide valve 325 can also be cancelled. These changes are also within the scope of protection of this patent.

[0036] like Fig.10 As shown, Figure a is a drilling stop anti-backflow station, at this time, the flow ring 324 blocks the radial flow hole 3121, and the check valve 325 contacts the right end of the check limit ring 313, cutting off the flow supply channel 6 at this location; Figure b is a drilling flow supply station, the water in the flow supply channel 6 pushes the check valve 325 to move right, and the water can continue to flow forward along the flow supply channel 6 after passing through the check valve 325; Figure c is a radial jet hole making station, at this time, the second push tube 323 moves to the right, pushing the first push tube 233 to move right synchronously, the flow ring 324 moves right accordingly, the radial flow hole 3121 opens, the jet nozzle 311 performs jet hole making, and at the same time, the water in the flow supply channel 6 pushes the check valve 325 to move right, and the water can continue to flow forward along the flow supply channel 6 after passing through the check valve 325. At this time, the second reset spring 326 is under pressure, and under its action, the second push tube 323 can be moved left and reset to exit the station.

[0037] like Fig.11 As shown, the push-tube drill rod 4 includes a third outer tube body 41, and a third push-tube assembly 42 is arranged in the third outer tube body 41; The third push tube assembly 42 includes a third push tube 424, which is provided with a fifth support ring 422 and a sixth support ring 423 to support the third push tube 424 in the third outer tube body 41, and a third return spring 425 to push the third push tube 424 to return to its original position, and a third sealing ring 421 is provided at one end of the third push tube 424. The third push tube assembly 42 also includes a universal limit stop ring.

[0038] The third push tube 424 can slide forward and backward along the center holes of the fifth support ring 422 and the sixth support ring 423 under the action of thrust (similarly, the first push tube 233 can slide forward and backward along the center hole of the first support ring 232 under the action of thrust; the second push tube 323 can slide forward and backward along the center holes of the third support ring 322 and the fourth support ring 327 under the action of thrust). The third return spring 425 is a compression spring, the left end of which is fixed to the outer wall of the third push tube 424, and the right end is restricted by the sixth support ring 423.

[0039] Fig.11 As shown, Figure a is the stop drilling anti-backflow station and the drilling flow supply station, and Figure b is the radial jet hole making station. At this time, the third push tube 424 moves to the right, pushing the second push tube 323 and the first push tube 233 to move to the right synchronously. At this time, the third reset spring 425 is under pressure, and under its action, the third push tube 424 can be moved to the left and reset to exit the station.

[0040] Fig.12 It is a schematic diagram of the sealing method after two push-tube drill rods 4 are connected by threaded connection, wherein Figure a shows the situation of this embodiment, the first sealing ring 231, the second sealing ring 321, and the third sealing ring 421 are all special-shaped polyurethane sealing rings with the same structural dimensions, and the function of the sealing ring is to achieve high-pressure sealing between the inner tubes after the threaded connection. Its advantages are: small occupied flow channel size, reliable sealing, high sealing pressure, flexible plug-in between the inner tubes, and long service life of the sealing ring.

[0041] In certain embodiments, as shown in FIG. b, the sealing between the inner tubes can also be achieved by using a universal sealing ring, which is also within the protection scope of this patent.

[0042] like Fig.13 and Fig.14 As shown, the push-tube hollow water braid 5 includes a sleeve 51, and a hollow oil cylinder 52 is arranged in the sleeve 51. The sleeve 51 is a special-shaped graphite copper sleeve.

[0043] The sleeve 51 is radially provided with a first oil pipe interface 511, a second oil pipe interface 512, a water inlet pipe interface 513 and at least one graphite column 515. The sleeve 51 is also provided with a rotating seal ring 514 for isolating the internal medium of the first oil pipe interface 511, the second oil pipe interface 512 and the water inlet pipe interface 513. Under rotating conditions, the graphite column 515 rubs against the metal, and the graphite can play a lubricating role. Traditional rotating machinery uses ball bearings. In order to reduce the mass and volume of the water braid, this patent uses a new type of graphite copper sleeve bearing.

[0044] The rotating seal ring 514 is provided at multiple locations. The sleeve 51 is equivalent to a collection of a bearing and a bearing outer sleeve. However, if a combination of multiple bearings and bearing outer tubes is used to replace the sleeve 51 of the present application, it will cause problems of heavy weight and complex structure. In some embodiments, even if a bearing and a bearing outer sleeve are used, it is also within the protection scope of this patent.

[0045] The hollow oil cylinder 52 includes a multifunctional cylinder body 521, on which a first oil path 5211 communicating with the first oil pipe interface 511, a second oil path 5212 communicating with the second oil pipe interface 512, and a water inlet path 5213 communicating with the water inlet pipe interface 513 are provided; A hollow push tube 522 is arranged in the multifunctional cylinder body 521 , and a piston 523 for isolating the first oil circuit 5211 and the second oil circuit 5212 and a cylinder cover 524 for sealing and limiting are arranged on the hollow push tube 522 .

[0046] The hollow oil cylinder 52 also includes a universal sealing ring, a guide sleeve, a dust ring, screws, etc. A male buckle connected to the push pipe drill rod 4 is provided at the right end of the hollow oil cylinder 52. The annular space between the inner hole of the male buckle and the hollow push pipe 522 is the flow supply channel 6 of this section, and the central hole of the hollow push pipe 522 is the exhaust pipe channel 7 of this section. The first oil circuit 5211 is formed by corresponding annular grooves and multiple radial holes in the annular grooves, and the second oil circuit 5212 and the water inlet circuit 5213 are formed by corresponding annular grooves and multiple axial holes.

[0047] The first oil pipe interface 511 and the second oil pipe interface 512 are respectively connected to their own high-pressure oil pipes, and the high-pressure oil pipe is connected to the oil pump of the hydraulic drilling rig, that is, the pipe pushing power comes from the oil pump of the hydraulic drilling rig; the water inlet pipe interface 513 is connected to the high-pressure water pipe, and the high-pressure water of the special clean water pump station or the static pressure water formed by the mining depth can be used. No matter whether the high-pressure water of the pump station or the static pressure water formed by the mining depth is used, it will not affect the flow direction switching of the axial flow supply and the radial jet.

[0048] In this embodiment, when the high-pressure oil pipe connected to the first oil pipe interface 511 is filled with oil into the first oil pipe interface 511 and the first oil circuit 5211, the hollow push tube 522 is pushed to the right under the action of the oil pressure; when the high-pressure oil pipe connected to the second oil pipe interface 512 is filled with oil into the second oil pipe interface 512 and the second oil circuit 5212, the hollow push tube 522 is pushed to the left under the action of the oil pressure.

[0049] In this embodiment, the hollow oil cylinder 52 is installed in the inner cavity of the sleeve 51 and rotates synchronously with the push-tube drill rod 4, while the sleeve 51 does not rotate.

[0050] In some embodiments, the characteristics of different power heads of different drilling rigs can also be used to integrate the push-tube hollow water braid 5 with the power head of the drilling rig, so as to automate the process of loading and unloading the water braid and reduce the labor intensity of workers. At this time, a hollow connector is also required to be set between the push-tube hollow water braid 5 and the push-tube drill rod 4 (after the push-tube hollow water braid 5 is integrated with the power head, its position is behind the power head, and the drill rod is also installed from the rear in the normal installation process of the drill rod, so after the integration, the drill rod needs to be installed between the drilling rig power head and the clamp. At this time, the newly installed drill rod cannot be directly inserted into the power head, and a hollow connector slightly longer than the power head needs to be set in the power head to connect with the newly installed drill rod). This structure is also within the protection scope of this patent.

[0051] like Fig.15 As shown, Figure a is a radial jet cavitation station. Under the thrust of the oil pump, the hollow push tube 522 is pushed to the right, driving the third push tube 424, the second push tube 323, and the first push tube 233 to move right synchronously, so that the jet nozzle 311 is opened. At this time, the follower cut-off ring 235 enters the fixed cut-off ring 224, and the axial drill bit flow supply is closed; Figure b is a drilling stop anti-backflow station and a drilling flow supply station. At this time, the thrust of the oil pump disappears, the third reset spring 425 pushes the third push tube 424 to move left and reset, the second reset spring 326 pushes the second push tube 323 to move left and reset, the first reset spring 234 pushes the first push tube 233 to move left and reset, and at the same time pushes the hollow push tube 522 to move left and reset, so that the jet nozzle 311 is closed and the axial drill bit flow supply is opened.

[0052] like Fig.16 As shown, the female end of the push-tube blowout suppressor 2 is connected to the male end of the push-tube ejector 3 by a thread, and the male end of the second push tube 323 is inserted into the female end of the first push tube 233 to perform linkage, wherein Figure a is a drilling stop anti-backflow station, the second push tube 323 and the first push tube 233 are stationary, the check limit ring 313 is engaged with the check flow slide valve 325 to disconnect the flow supply channel 6, and prevent objects such as slag water from entering the inside of the drill pipe along the flow channel from the outside of the drill pipe. Figure b shows a drilling flow supply station, in which the second push tube 323 and the first push tube 233 are stationary, the non-return limit ring 313 and the non-return flow slide valve 325 are in a separated state, the fixed shut-off ring 224 and the follower shut-off ring 235 are in a separated state, and flow is supplied to the drill bit for drilling, etc.; Figure c shows a radial jet hole making station, in which the second push tube 323 and the first push tube 233 move rightward in the direction of the drill bit, driving the flow ring 324 to move rightward, the non-return limit ring 313 and the non-return flow slide valve 325 are in a separated state, the fixed shut-off ring 224 and the follower shut-off ring 235 overlap, blocking the flow supply channel 6 from being unobstructed, and supplying flow to the jet nozzle 311 and the mesh threaded cover 212, for jetting and clearing operations.

[0053] like Fig.17As shown, in some embodiments, the push-tube spray suppressor 2 and the push-tube ejector 3 can also be processed into one body, and the second push-tube 323 and the first push-tube 233 can be combined into one push-tube, and the various internal components can be arranged on the push-tube in sequence. This structure is also within the protection scope of this patent. Figure a shows the backflow prevention working condition when drilling is stopped, the combined push tube does not move, the check limit ring 313 is engaged with the check flow slide valve 325 to disconnect the flow supply channel 6 to prevent backflow; Figure b shows the flow supply working condition when drilling, the first push tube 233 does not move, the check limit ring 313 and the check flow slide valve 325 are in a separated state, the fixed cut-off ring 224 and the follow-up cut-off ring 235 are in a separated state, and flow is supplied to the drill bit for drilling, etc.; Figure c shows the radial jet cavitation working condition, the first push tube 233 is pushed in the direction of the drill bit, driving 324 to move in the direction of the drill bit, the check limit ring 313 and the check flow slide valve 325 are in a separated state, the fixed cut-off ring 224 and the follow-up cut-off ring 235 are overlapped, blocking the smooth flow of the flow supply channel 6, and performing jetting and clearing operations.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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 push-tube hydraulic hole-making and blowout-eliminating drilling tool for drilling through the protruding coal seam, characterized by: It comprises a pipe-planting drill bit (1), a pipe-pushing spray suppressor (2), a pipe-pushing ejector (3), at least one pipe-pushing drill rod (4) and a pipe-pushing hollow water braid (5) which are connected in sequence; The pipe-planting drill bit (1), the pipe-pushing spray suppressor (2), the pipe-pushing ejector (3), the pipe-pushing drill rod (4) and the pipe-pushing hollow water braid (5) are provided with a flow supply channel (6) for flowing toward the pipe-planting drill bit (1) and an exhaust pipe-planting channel (7) for flowing in the opposite direction to the flow supply channel (6).

2. The protruding coal seam through-drilling and pipe-pushing hydraulic hole-making and blowout-eliminating drilling tool according to claim 1 is characterized in that: The push-tube spray suppressor (2) comprises a first outer tube body (22), a flushing and anti-blocking assembly (21) is mounted on the first outer tube body (22), and a first push-tube assembly (23) and a short tube assembly (24) are arranged inside the first outer tube body (22); The side wall of the first outer tube body (22) is provided with a flushing flow supply hole (221) connected to the flow supply channel (6); the flushing flow supply hole (221) is connected to the special-shaped groove (223) via the buried pipe groove (222); the side wall of the first outer tube body (22) is also provided with a radial air inlet hole (225) connected to the exhaust implant pipe channel (7); The flushing anti-blocking component (21) comprises a filter mesh (211), a mesh thread cover (212) for 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) installed on the radial air intake hole (225).

3. The protruding coal seam through-drilling and pipe-pushing hydraulic hole-making and blowout-eliminating drilling tool according to claim 2 is characterized in that: The inner wall of the first outer tube (22) is provided with a fixed intercepting ring (224); The first push tube assembly (23) comprises a first push tube (233), the first push tube (233) being provided with a first support ring (232) for supporting the first push tube (233) in the first outer tube body (22), a first return spring (234) for pushing the first push tube to return to its original position, and a follower cut-off ring (235) that can cooperate with a fixed cut-off ring (224) to cut off the flow supply channel (6), and a first sealing ring (231) is also provided at one end of the first push tube (233).

4. The protruding coal seam through-drilling and pipe-pushing hydraulic hole-making and blowout-eliminating drilling tool according to claim 3 is characterized in that: The short tube assembly (24) comprises a short tube (242), and a second support ring (241) is provided on the short tube (242) for supporting the short tube (242) inside the first outer tube body (22).

5. The protruding coal seam through-drilling and pipe-pushing hydraulic hole-making and blowout-eliminating drilling tool according to claim 1 is characterized in that: The push-tube ejector (3) comprises a second outer tube body (31), wherein a second push-tube assembly (32) is arranged inside the second outer tube body (31); A jet nozzle (311) connected to the flow supply channel (6) is provided on the side wall of the second outer tube body (31), a radial flow ring (312) and a non-return limit ring (313) are provided inside the second outer tube body (31), and a radial flow hole (3121) connected to the jet nozzle (311) is provided on the radial flow ring (312).

6. The protruding coal seam through-drilling and pipe-pushing hydraulic hole-making and blowout-eliminating drilling tool according to claim 5 is characterized in that: The second push tube assembly (32) comprises a second push tube (323), the second push tube (323) being provided with a third support ring (322) and a fourth support ring (327) for supporting the second push tube (323) in the second outer tube body (31), the second push tube (323) being further provided with a flow ring (324) capable of sealing the radial flow hole (3121), a non-return flow slide valve (325) capable of contacting the non-return limit ring (313) to cut off the flow supply channel (6), and a second return spring (326) for pushing the second push tube (323) to return to its original position, and a second sealing ring (321) being further provided at one end of the second push tube (323).

7. The protruding coal seam through-drilling and pipe-pushing hydraulic hole-making and blowout-eliminating drilling tool according to claim 1 is characterized in that: The push-tube drill rod (4) comprises a third outer tube body (41), and a third push-tube assembly (42) is arranged inside the third outer tube body (41); The third push tube assembly (42) comprises a third push tube (424), the third push tube (424) being provided with a fifth support ring (422) and a sixth support ring (423) for supporting the third push tube (424) in the third outer tube body (41), the third push tube (424) being further provided with a third return spring (425) for pushing the third push tube (424) to return to its original position, and a third sealing ring (421) being provided at one end of the third push tube (424).

8. The protruding coal seam through-drilling and pipe-pushing hydraulic hole-making and blowout-eliminating drilling tool according to claim 1 is characterized in that: The push-tube hollow water braid (5) comprises a sleeve (51), and a hollow oil cylinder (52) is arranged inside the sleeve (51).

9. The protruding coal seam through-drilling and pipe-pushing hydraulic hole-making and blowout-eliminating drilling tool according to claim 8 is characterized in that: The sleeve (51) is provided with a first oil pipe interface (511), a second oil pipe interface (512), a water inlet pipe interface (513) and at least one graphite column (515) in a radial direction, and a rotating sealing ring (514) for isolating the internal medium of the first oil pipe interface (511), the second oil pipe interface (512) and the water inlet pipe interface (513) is also provided in the sleeve (51).

10. The protruding coal seam through-drilling and pipe-pushing hydraulic hole-making and blowout-eliminating drilling tool according to claim 9 is characterized in that: The hollow oil cylinder (52) comprises a multifunctional cylinder body (521), and the multifunctional cylinder body (521) is provided with a first oil circuit (5211) communicating with the first oil pipe interface (511), a second oil circuit (5212) communicating with the second oil pipe interface (512), and a water inlet circuit (5213) communicating with the water inlet pipe interface (513); A hollow push tube (522) is arranged in the multifunctional cylinder body (521), and a piston (523) for isolating the first oil circuit (5211) and the second oil circuit (5212) and a cylinder cover (524) for sealing and limiting are arranged on the hollow push tube (522).

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