Drilling-spraying-cutting long-distance hole forming-hole protecting-permeability increasing integrated device and construction method

Abstract

The invention discloses a drilling-spraying-cutting long-distance hole forming-hole protecting-permeability increasing integrated device and a construction method, and aims to provide a drilling-spraying-cutting integrated solution for the problems that long-distance hole forming is difficult and coal seam permeability is poor in high-stress complex structure stratum gas extraction. The drilling-spraying-cutting long-distance hole forming-hole protecting-permeability increasing integrated device is composed of a double-flow-channel through cable drill rod, a spraying hole protecting drill rod, a jet flow slotting drill rod, a non-magnetic drill rod, a screw motor, a drill bit and other components, and in combination with the disclosed drilling-spraying-cutting construction method, timely spraying type shield drilling of a high-stress complex structure stratum can be achieved; and meanwhile, drilling is retreated for slotting, a gas flowing channel is reconstructed, the single-hole gas extraction yield is increased, and then quality improvement and efficiency improvement of underground coal mine gas extraction are promoted.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine drilling, and specifically relates to a drill-spray-cut long-distance hole-forming-hole protection-permeability enhancement integrated device and a construction method thereof. Background Technique

[0002] With the continuous increase of coal mining depth in China, the problem of gas control in soft and low-permeability coal seams has become increasingly prominent. During the gas drainage process, borehole construction is one of the key links, but there are many deficiencies in the existing technologies. For example, the depth of coal seam boreholes constructed by hollow drill pipes combined with ordinary drills is relatively shallow. Especially in soft and complex coal seams, the drilling depth is difficult to exceed 100 meters, and there are unpredictable borehole collapses during the drilling process. With the introduction and development of directional drilling technology equipment, the use of complete sets of technology equipment such as downhole motors, coaxial drill pipes, and high-torque drills has improved the depth of coal seam hole formation in China, reaching about 400 meters. However, most of them are concentrated in mining areas with a relatively high coal seam firmness coefficient, and the hole formation depth in coal seams in other areas is still not ideal. The main reason is still the unpredictable collapse of boreholes during the drilling process. Even if short-distance hole formation can be achieved in soft coal seams, high in-situ stress will cause the boreholes to quickly become unstable or close, seriously affecting the later gas drainage effect. Currently, the method of installing screen pipes while drilling or installing screen pipes in a timely manner after hole formation is mostly used to ensure the smoothness of the gas flow channel after hole formation. However, such technologies have a large labor intensity and low construction efficiency. The permeability of soft coal seams with high in-situ stress is relatively low, and the effect of hydraulic fracturing for permeability enhancement is weak. Currently, measures such as hydraulic punching, hydraulic cavity formation, and mechanical cavity formation are mostly used for permeability enhancement. Although traditional hydraulic punching and cavity formation technologies can improve the permeability of coal seams, they have problems such as long operation time, unstable equipment, and low construction efficiency. In addition, after hydraulic punching, hydraulic cavity formation, and mechanical cavity formation, bare hole drainage is generally used, and the risk of borehole instability and collapse is extremely high. Although screen pipes can be installed after punching, the operation process is relatively complex and the labor intensity is large.

[0003] In summary, for the coal seams in most mining areas in China, which are high-gas and low-permeability coal seams, characterized by soft coal quality and poor permeability, the problems existing in gas control are summarized as "short hole-forming distance", "serious borehole instability", and "low efficiency of permeability enhancement construction". In addition, the existing technology equipment can only solve a certain problem and cannot solve problems such as "long-distance hole formation", "hole protection", and "high-efficiency permeability enhancement" at the same time. Therefore, in order to increase the hole formation depth and borehole stability, and at the same time perform in-situ permeability enhancement, it is necessary to develop a complete set of equipment integrating "hole formation", "hole protection", and "permeability enhancement" and related construction methods in combination with directional drilling technology equipment. Summary of the Invention

[0004] The object of the present invention is to provide a device and construction method that can improve the hole-forming depth and drilling stability, and at the same time can perform in-situ permeability enhancement, and can realize the integration of long-distance hole-forming, hole protection and permeability enhancement of drilling-spraying-cutting. By spraying to protect the hole, the stability of the surrounding rock of the drill hole is improved, and thus the hole-forming depth is increased. By cutting slots, the gas flow channel is reconstructed and the coal seam gas permeability is enhanced, which has significant innovation and practicality.

[0005] To achieve the above object, the present invention adopts the following technical solutions: The integrated device for long-distance hole-forming, hole protection and permeability enhancement of drilling-spraying-cutting includes a double-channel cable-connected drill pipe, a spraying hole-protecting drill pipe, a non-magnetic drill pipe, a jet cutting drill pipe, a positive displacement motor and a drill bit, which are connected in sequence from left to right. The left end of the double-channel cable-connected drill pipe is provided with a first male thread for connecting the drill tail, and the right end of the double-channel cable-connected drill pipe is provided with a first female thread. The left end of the spraying hole-protecting drill pipe is provided with a second male thread corresponding to the first female thread, and the right end of the spraying hole-protecting drill pipe is provided with a second female thread. The left end of the non-magnetic drill pipe is provided with a third male thread corresponding to the second female thread, and the right end of the non-magnetic drill pipe is provided with a third female thread. The left end of the jet cutting drill pipe is provided with a fourth male thread corresponding to the third female thread, and the right end of the jet cutting drill pipe is provided with a fourth female thread. The positive displacement motor is arranged at the right end of the jet cutting drill pipe, and the drill bit is installed at the right end of the positive displacement motor; The double-channel cable-connected drill pipe includes a first rod body, and a first fluid supply channel is formed inside the first rod body. A first spraying pipe and a first cable pipe are installed in the first rod body through a plurality of first support retaining rings. The spraying hole-protecting drill pipe includes a second rod body, and a second fluid supply channel is formed inside the second rod body. The first fluid supply channel and the second fluid supply channel are communicated. A second spraying pipe is installed in the second rod body through the first support retaining ring, and a second cable pipe is installed through the first support retaining ring and a second support retaining ring. The first spraying pipe and the second spraying pipe are inserted into each other, and the first cable pipe and the second cable pipe are inserted into each other. A spraying channel is formed inside the first spraying pipe and the second spraying pipe, and an optical cable is installed in the first cable pipe and the second cable pipe.

[0006] The second rod body is provided with spraying holes, and nozzles with an outward spraying direction are arranged on the spraying holes. The right end of the second spraying pipe is connected to the nozzles.

[0007] The jet cutting drill pipe includes a third rod body, and a third fluid supply channel is formed inside the third rod body. A slider is arranged in the third rod body. A fixed block is arranged on the right side of the slider. Upper through holes and lower through holes are formed in the fixed block. A central through hole is arranged on the central axis of the slider. Upper plug projections corresponding to the upper through holes and lower plug projections corresponding to the lower through holes are arranged on the right side surface of the slider; A plurality of springs are arranged between the slider and the fixed block. A plurality of jet ports are arranged on the outer surface of the third rod body along the circumference. The slider blocks the jet ports in the initial state.

[0008] During spray construction, the left end of the double-channel cable-connected drill pipe is connected to the spray drill tail through a drill tail adapter. During drilling and slotting, the left end of the double-channel cable-connected drill pipe is connected to the drilling and slotting drill tail. The right ends of both the drilling and slotting drill tail and the drill tail adapter are provided with fifth female thread taps corresponding to the first male thread taps. The drill tail adapter includes an adapter rod body. An irregular connecting pipe is arranged inside the adapter rod body through a second support retaining ring and a third support retaining ring. The left end of the drill tail adapter is provided with a fifth male thread tap. The right end of the spray drill tail is provided with a sixth female thread tap corresponding to the fifth male thread tap. The spray drill tail includes a housing. A feed channel is formed inside the housing. The left end of the feed channel is set as a feed inlet, and the right end of the feed channel is set as a discharge outlet. A first sealing ring and a first bearing are arranged at the feed inlet, and a second sealing ring and a second bearing are arranged at the discharge outlet.

[0009] The first support retaining ring includes a first support ring. A first circular ring and a second circular ring are arranged inside the first support ring. The second circular ring is concentric with the first support ring. The centers of the first circular ring and the second circular ring are on the same vertical line. A first connecting rod is arranged between the first circular ring and the second circular ring. A first inclined rod is arranged between the first circular ring and the first support ring. A second connecting rod is arranged between the second circular ring and the first support ring. The second support retaining ring includes a second support ring. A third circular ring is arranged inside the second support ring. The third circular ring is concentric with the second support ring. A third connecting rod is arranged between the second support ring and the third circular ring. The third support retaining ring includes a third support ring. A fourth circular ring is arranged inside the third support ring. The centers of the fourth circular ring and the third support ring are on the same vertical line. A fourth connecting rod is arranged between the fourth circular ring and the third support ring.

[0010] The drilling-spraying-slotting long-distance hole-forming-hole-protecting-permeability-increasing integrated construction method is implemented based on the above-mentioned drilling-spraying-slotting long-distance hole-forming-hole-protecting-permeability-increasing integrated device, and includes the following steps: (1) Assemble the integrated device and carry out drilling: First, install the drill bit on the positive displacement motor, then install the positive displacement motor on the right end of the jet cutting drill pipe, then install the jet cutting drill pipe on the right end of the non-magnetic drill pipe through the fourth male thread tap and the third female thread tap, then install the non-magnetic drill pipe on the right end of the spray hole-protecting drill pipe through the third male thread tap and the second female thread tap, then install the spray hole-protecting drill pipe on the right end of the double-channel cable-connected drill pipe through the second male thread tap and the first female thread tap, then install the drilling and slotting drill tail on the left end of the double-channel cable-connected drill pipe through the first male thread tap and the fifth female thread tap, and finally block the spray channel with a plug and drive the positive displacement motor by supplying water into the first fluid supply channel to drive the drill bit to cut the coal by rotation. (2) Retreating spraying: After drilling a certain distance, remove the drilling and slitting drill tail, and install the spraying drill tail through the drill tail adapter at the left end of the double-channel cable-connected drill pipe. Pull out the plug to make the spraying channel unblocked and use a gear pump to inject the spraying material into the spraying drill tail. At the same time, retreat the drill at a low speed for retreating spraying; (3) After spraying is completed, drill again. Cycle through drilling, spraying, and then drilling until the designated depth is reached. Then start retreating slitting. Inject high-pressure water into the double-channel cable-connected drill pipe. The high-pressure water enters the jet slitting drill pipe through the spraying hole-protecting drill pipe and the non-magnetic drill pipe to perform slitting, thereby realizing the integrated operation of drilling, spraying, and slitting.

[0011] In step (1), before connecting the threads of each component, first connect the first spraying pipe and the second spraying pipe, and connect the first cable pipe and the second cable pipe. After connecting the first spraying pipe and the second spraying pipe, and the first cable pipe and the second cable pipe, then perform the thread connection of the corresponding components.

[0012] In step (2), after connecting the external spraying feed pipe to the left end of the spraying drill tail, the first sealing ring and the first bearing are tightly connected. After connecting the right end of the spraying drill tail to the left end of the drill tail converter, the second sealing ring and the second bearing are tightly connected. The right end of the drill tail adapter is connected to the left end of the double-channel cable-connected drill pipe. The right end of the special-shaped connecting pipe is connected to the left end of the first spraying pipe. The left end of the special-shaped connecting pipe is connected to the outlet of the feed channel through the second sealing ring and the second bearing.

[0013] In step (3), after the high-pressure water enters the jet slitting drill pipe through the spraying hole-protecting drill pipe and the non-magnetic drill pipe, it pushes the slider to move to the right and compress the spring, causing the slider to slide away from the jet orifice. At this time, the upper plug projection and the lower plug projection on the slider are respectively inserted into the upper through hole and the lower through hole of the fixed block, so that the high-pressure water can only be ejected from the jet orifice of the jet slitting drill pipe to perform the slitting action.

[0014] The jet slotted drill pipe of the present application includes a third rod body. A third fluid supply channel is formed inside the third rod body. A slider is arranged inside the third rod body. A fixed block is arranged on the right side of the slider. An upper through hole and a lower through hole are formed on the fixed block. A central through hole is arranged on the central axis of the slider. An upper plug protrusion corresponding to the upper through hole and a lower plug protrusion corresponding to the lower through hole are arranged on the right side surface of the slider. A plurality of springs are arranged between the slider and the fixed block. A plurality of jet ports are arranged along the circumference on the outer surface of the third rod body. The slider blocks the jet ports in the initial state. During drilling, the water injected into the device drives the screw motor through the central through hole of the slider and the upper through hole and the lower through hole of the fixed block, and then drives the drill bit to perform rotary cutting drilling. During slotting, the high-pressure water will push the slider to move to the right, so that the upper plug protrusion on the slider blocks the upper through hole on the fixed block and the lower plug protrusion on the slider blocks the lower through hole on the fixed block, thereby ensuring that the high-pressure water only shoots out of the drill pipe through the jet ports for slotting, realizing the conversion between drilling and slotting, and further realizing the integrated operation of drilling, spraying and slotting.

[0015] The integrated construction method of drilling-spraying-slotting for long-distance hole formation-hole protection-permeability enhancement of the present application first performs drilling, realizes spraying construction by replacing the drill tail. After drilling and spraying to a certain depth, high-pressure water is introduced. Through the special internal structure of the jet slotted drill pipe, slotting construction is realized, and thus the integrated construction of drilling, spraying and slotting is realized, saving costs and improving construction efficiency. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the integrated device of the present invention.

[0017] Figure 2 is a schematic structural diagram of the double-channel cable-passing drill pipe of the present invention.

[0018] Figure 3 is a schematic structural diagram of the spraying hole protection drill pipe of the present invention.

[0019] Figure 4 is a schematic structural diagram of the jet slotted drill pipe of the present invention.

[0020] Figure 5 is a schematic structural diagram of the drill tail adapter of the present invention.

[0021] Figure 6 is a schematic structural diagram of the spraying drill tail of the present invention.

[0022] Figure 7 is a schematic diagram of the inside of the hole after the drilling-spraying-slotting construction of the present invention is completed. Detailed Embodiments

[0023] The following further describes the embodiments of the present invention with reference to the drawings.

[0024] Embodiment 1 As Figures 1-6 shown, the integrated device for long-distance hole formation, hole protection and permeability enhancement by drilling-spraying-cutting includes a double-channel cable-connected drill pipe 1, a spraying and hole-protecting drill pipe 2, a non-magnetic drill pipe 3, a jet slotted drill pipe 4, a positive displacement motor 5 and a drill bit 6 connected in sequence from left to right. A first male thread is provided at the left end of the double-channel cable-connected drill pipe 1 for connecting to the drill tail, and a first female thread is provided at the right end of the double-channel cable-connected drill pipe. A second male thread corresponding to the first female thread is provided at the left end of the spraying and hole-protecting drill pipe, and a second female thread is provided at the right end of the spraying and hole-protecting drill pipe. A third male thread corresponding to the second female thread is provided at the left end of the non-magnetic drill pipe 3, and a third female thread is provided at the right end of the non-magnetic drill pipe 3. A fourth male thread corresponding to the third female thread is provided at the left end of the jet slotted drill pipe 4, and a fourth female thread is provided at the right end of the jet slotted drill pipe 4. The positive displacement motor 5 is provided at the right end of the jet slotted drill pipe 4, and the drill bit 6 is installed at the right end of the positive displacement motor 5; The double-channel cable-connected drill pipe 1 includes a first rod body 7. A first fluid supply channel 8 is formed inside the first rod body 7. A first spraying pipe 10 and a first cable pipe 11 are installed inside the first rod body 7 through a plurality of first support retaining rings 9. The spraying and hole-protecting drill pipe 2 includes a second rod body 12. A second fluid supply channel 13 is formed inside the second rod body 12. The first fluid supply channel 8 and the second fluid supply channel 13 are communicated. A second spraying pipe 14 is installed inside the second rod body 12 through the first support retaining rings 9. A second cable pipe 16 is installed through the first support retaining rings 9 and second support retaining rings 15. The first spraying pipe 10 and the second spraying pipe 14 are inserted into each other, and the first cable pipe 11 and the second cable pipe 16 are inserted into each other. A spraying channel is formed inside the first spraying pipe 10 and the second spraying pipe 14, and an optical cable is installed inside the first cable pipe 11 and the second cable pipe 16.

[0025] Spraying holes are provided on the second rod body 12, and nozzles 17 with an outward jetting direction are provided on the spraying holes. The right end of the second spraying pipe 14 is connected to the nozzles 17.

[0026] The jet slotted drill pipe 4 includes a third rod body 18. A third fluid supply channel 19 is formed inside the third rod body 18. A slider 20 is provided inside the third rod body 18. A fixing block 21 is provided on the right side of the slider 20. An upper through hole 23 and a lower through hole 24 are formed on the fixing block 21. A central through hole 25 is provided on the central axis of the slider 20. An upper plug projection 26 corresponding to the upper through hole 23 and a lower plug projection 27 corresponding to the lower through hole 24 are provided on the right side surface of the slider 20; A plurality of springs 22 are provided between the slider 20 and the fixing block 21. A plurality of jet ports 28 are provided on the outer surface of the third rod body 18 along the circumference. The slider 20 blocks the jet ports 28 in the initial state.

[0027] When performing spraying construction, the left end of the double-channel cable-connected drill pipe 1 is connected to the spraying drill tail through a drill tail adapter. When performing drilling and slotting, the left end of the double-channel cable-connected drill pipe 1 is connected to the drilling and slotting drill tail. The right ends of both the drilling and slotting drill tail and the drill tail adapter are provided with fifth female thread threads corresponding to the first male thread threads. The drill tail adapter includes an adapter rod body 29. Inside the adapter rod body 29, a special-shaped connecting pipe 31 is arranged through a second support retaining ring 15 and a third support retaining ring 30. The left end of the drill tail adapter is provided with fifth male thread threads, and the right end of the spraying drill tail is provided with sixth female thread threads corresponding to the fifth male thread threads. The spraying drill tail includes a housing 32. An inlet channel 33 is formed inside the housing 32. The left end of the inlet channel 33 is set as an inlet 38, and the right end of the inlet channel 33 is set as an outlet 39. A first sealing ring 34 and a first bearing 35 are arranged at the inlet 38, and a second sealing ring 36 and a second bearing 37 are arranged at the outlet 39.

[0028] The first support retaining ring 9 includes a first support ring. Inside the first support ring, a first circular ring and a second circular ring are arranged. The second circular ring is concentric with the first support ring. The centers of the first circular ring and the second circular ring are on the same vertical line. A first connecting rod is arranged between the first circular ring and the second circular ring, a first inclined rod is arranged between the first circular ring and the first support ring, and a second connecting rod is arranged between the second circular ring and the first support ring. The second support retaining ring 15 includes a second support ring. Inside the second support ring, a third circular ring is arranged. The third circular ring is concentric with the second support ring. A third connecting rod is arranged between the second support ring and the third circular ring. The third support retaining ring 30 includes a third support ring. Inside the third support ring, a fourth circular ring is arranged. The centers of the fourth circular ring and the third support ring are on the same vertical line. A fourth connecting rod is arranged between the fourth circular ring and the third support ring. The inner diameter of the first circular ring is slightly larger than the outer diameters of the first spraying pipe 10 and the second spraying pipe 14. The inner diameter of the second circular ring is slightly larger than the outer diameters of the first cable pipe 11 and the second cable pipe 16. The inner diameter of the third circular ring is slightly larger than the outer diameter of the second cable pipe 16. The inner diameter of the fourth circular ring is slightly larger than the outer diameter of the special-shaped connecting pipe 31.

[0029] When the integrated device of the present application is performing drilling, the water injected into the device drives the screw motor 5 through the central through hole 25 of the slider 20 and the upper through hole 23 and the lower through hole 24 of the fixed block 21, and then drives the drill bit 6 to perform rotary cutting drilling. When performing slotting, the high-pressure water will push the slider 20 to move to the right, so that the upper plug protrusion 26 on the slider 20 blocks the upper through hole 23 on the fixed block 21 and the lower plug protrusion 27 on the slider 20 blocks the lower through hole 24 on the fixed block 21, thereby ensuring that the high-pressure water only shoots out of the drill pipe through the jet orifice 28 for slotting, realizing the conversion between drilling and slotting, and further realizing the integrated operation of drilling, spraying, and slotting.

[0030] Embodiment 2 The drilling-jetting-cutting long-distance hole-forming-hole protection-permeability enhancement integrated construction method is implemented based on the drilling-jetting-cutting long-distance hole-forming-hole protection-permeability enhancement integrated device described in Embodiment 1, and includes the following steps: (1) Assemble the integrated device and carry out drilling: First, install the drill bit 6 on the positive displacement motor 5, then install the positive displacement motor 5 on the right end of the jet cutting drill pipe 4, then install the jet cutting drill pipe 4 on the right end of the non-magnetic drill pipe 3 through the fourth male thread and the third female thread, then install the non-magnetic drill pipe 3 on the right end of the spraying hole protection drill pipe 2 through the third male thread and the second female thread, then install the spraying hole protection drill pipe 2 on the right end of the double-channel cable-carrying drill pipe 1 through the second male thread and the first female thread, then install the drilling and cutting drill tail on the left end of the double-channel cable-carrying drill pipe 1 through the first male thread and the fifth female thread, and finally block the spraying channel and drive the positive displacement motor 5 by supplying water into the first water supply channel 8 to drive the drill bit 6 to rotate and cut coal. At this time, the water supply pressure does not exceed 5 MPa. When the water flow passes through the jet cutting drill pipe 4, the slider 20 does not move to the right under the support of the spring 22. When the water pressure rises above 8 MPa, the slider 20 moves forward.

[0031] (2) Retreating and spraying: After drilling a certain distance (set as needed, such as 20 m), remove the drilling and cutting drill tail, and install the spraying drill tail with the drill tail adapter on the left end of the double-channel cable-carrying drill pipe 1. Pull out the plug to make the spraying channel unblocked and inject the spraying material into the spraying drill tail by using a gear pump, and at the same time retreat the drill at a low speed for retreating and spraying; when carrying out retreating and spraying, the retreat speed of the drill should be below 1 m / min.

[0032] (3) After spraying is completed, carry out drilling again (for this drilling operation, the drill bit 6 needs to be advanced forward to the position before retreating and spraying and then carry out drilling), and cycle drilling, spraying, and then drilling until the specified depth is reached (the specified depth is set as needed, and spraying construction needs to be completed before retreating and cutting. Since the spraying is retreating and spraying, the drill bit 6 needs to be advanced forward to the position before spraying and then carry out retreating and cutting), and then start to carry out retreating and cutting. Inject high-pressure water into the double-channel cable-carrying drill pipe 1, and the high-pressure water enters the jet cutting drill pipe 4 through the spraying hole protection drill pipe 2 and the non-magnetic drill pipe 3 for cutting, thereby realizing the integrated operation of drilling, spraying, and cutting. When carrying out retreating and cutting with the drill, the retreat speed of the drill is below 0.5 m / min.

[0033] In step (1), before connecting the threads of each component, first connect the first spraying pipe 10 and the second spraying pipe 14, and connect the first cable pipe 11 and the second cable pipe 16. After connecting the first spraying pipe 10 and the second spraying pipe 14, and the first cable pipe 11 and the second cable pipe 16, then carry out the corresponding component thread connection.

[0034] In step (2), after an external spraying feed pipe is connected to the left end of the self-drilling screw, a tight connection is formed between the first sealing ring 34 and the first bearing 35. After the right end of the self-drilling screw is connected to the left end of the drill tail converter, a tight connection is formed between the second sealing ring 36 and the second bearing 37. The right end of the drill tail adapter is connected to the left end of the double-channel cable drill pipe 1, and the left end of the special-shaped connecting pipe 31 is connected to the right end of the first spraying pipe 10. The left end of the special-shaped connecting pipe 31 is connected to the discharge port 39 of the feed channel 33 through the second sealing ring 36 and the second bearing 37.

[0035] In step (3), at this time, the water pressure of the high-pressure water is greater than 10 MPa. The high-pressure water enters the jet slotted drill pipe 4 through the spraying hole protecting drill pipe 2 and the non-magnetic drill pipe 3, and then pushes the slider 20 to move to the right, compressing the spring 22 so that the slider 20 slides away from the jet port 28. At this time, the upper plug projection 26 and the lower plug projection 27 on the slider 20 are respectively inserted into the upper through hole 23 and the lower through hole 24 of the fixed block 21, so that the high-pressure water can only be ejected from the jet port 28 of the jet slotted drill pipe 4 to realize the slitting action.

[0036] The integrated construction method of drilling-spraying-cutting for long-distance hole formation-hole protection-permeability enhancement of the present application first performs drilling, realizes spraying construction by replacing the drill tail. After drilling and spraying to a certain depth, high-pressure water is introduced. Through the special internal structure of the jet slotted drill pipe 4, slitting construction is realized, and thus the integrated construction of drilling, spraying and slitting is achieved, saving costs and improving construction efficiency. In addition, as Figure 7 shown, after the drilling-spraying-cutting construction of the present application is completed, a sprayed coating 41 and a slit 42 are formed in the borehole 40, and at the same time, the technical purposes of "long-distance drilling", "hole protection" and "permeability enhancement" of the soft and low-permeability coal seam are realized.

[0037] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that; the present invention can still be modified or equivalently replaced, and any modification or partial replacement without departing from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims

1. Drilling-spraying-cutting long-distance hole-forming-hole-protecting-transmittance-enhancing integrated device, characterized by: It comprises a double-channel cable drill rod, a spray hole protection drill rod, a non-magnetic drill rod, a jet slotting drill rod, a screw motor and a drill bit which are sequentially connected from left to right, the left end of the double-channel cable drill rod is provided with a first male threaded buckle for connecting the drill tail, the right end of the double-channel through-bar drill rod is provided with a first female threaded buckle, the left end of the spray protection drill rod is provided with a second male threaded buckle corresponding to the first female threaded buckle, the right end of the spray protection drill rod is provided with a second female threaded buckle, the left end of the non-magnetic drill rod is provided with a third male threaded buckle corresponding to the second female threaded buckle, the right end of the non-magnetic drill rod is provided with a third female threaded buckle, the left end of the jet slotting drill rod is provided with a fourth male threaded buckle corresponding to the third female threaded buckle, the right end of the jet slotting drill rod is provided with a fourth female threaded buckle, the screw motor is provided at the right end of the jet slotting drill rod, and the drill bit is installed at the right end of the screw motor; The dual-channel cable drill rod includes a first rod body, a first flow supply channel is formed inside the first rod body, a first spraying tube and a first cable tube are installed in the first rod body through a plurality of first supporting retaining rings, the spray hole protection drill rod includes a second rod body, a second flow supply channel is formed inside the second rod body, the first flow supply channel and the second flow supply channel are connected, a second spraying tube is installed in the second rod body through the first supporting retaining ring, a second cable tube is installed through the first supporting retaining ring and the second supporting retaining ring, the first spraying tube and the second spraying tube are plugged into each other, the first cable tube and the second cable tube are plugged into each other, spraying channels are formed inside the first spraying tube and the second spraying tube, and optical cables are installed in the first cable tube and the second cable tube.

2. The integrated device for drilling, spraying and cutting long-distance hole forming, hole protection and permeability enhancement according to claim 1, characterized in that: The second rod body is provided with a spraying hole, the spraying hole is provided with a nozzle with a spraying direction facing outwards, and the right end of the second spraying pipe is connected with the nozzle.

3. The integrated device for drilling, spraying and cutting long-distance hole forming, hole protection and permeability enhancement according to claim 2 is characterized in that: The jet slotted drill rod comprises a third rod body, a third flow supply channel is formed in the third rod body, a slider is arranged in the third rod body, a fixing block is arranged on the right side of the slider, an upper through hole and a lower through hole are opened on the fixing block, a central through hole is arranged on the central axis of the slider, and an upper plugging protrusion corresponding to the upper through hole and a lower plugging protrusion corresponding to the lower through hole are arranged on the right side surface of the slider; A plurality of springs are arranged between the slider and the fixed block, a plurality of jet ports are arranged along the circumference on the outer surface of the third rod body, and the slider blocks the jet ports in the initial state.

4. The integrated drilling-spraying-cutting long-distance hole-forming-hole-protecting-transmittance-enhancing device according to claim 3 is characterized in that: When performing spraying construction, the left end of the double-channel cable drill rod is connected to the spraying drill tail through the drill tail adapter. When performing drilling and slitting, the left end of the double-channel cable drill rod is connected to the drilling and slitting drill tail. The right end of the drilling and slitting drill tail and the right end of the drill tail adapter are both provided with a fifth female thread corresponding to the first male thread. The drill tail adapter includes an adapter rod body, the interior of the adapter rod body is provided with a special-shaped connecting pipe through a second support retaining ring and a third support retaining ring, the left end of the drill tail adapter is provided with a fifth male threaded thread, the right end of the spray drill tail is provided with a sixth female threaded thread corresponding to the fifth male threaded thread, the spray drill tail includes a shell, a feed channel is formed inside the shell, the left end of the feed channel is provided as a feed port, the right end of the feed channel is provided as a discharge port, a first sealing ring and a first bearing are provided at the feed port, and a second sealing ring and a second bearing are provided at the discharge port.

5. The integrated device for drilling, spraying and cutting long-distance hole forming, hole protection and permeability enhancement according to claim 4, characterized in that: The first support retaining ring includes a first support ring, a first circular ring and a second circular ring are arranged inside the first support ring, the second circular ring is arranged concentrically with the first support ring, the centers of the first circular ring and the second circular ring are on the same vertical line, a first connecting rod is arranged between the first circular ring and the second circular ring, a first oblique rod is arranged between the first circular ring and the first support ring, and a second connecting rod is arranged between the second circular ring and the first support ring; the second support retaining ring includes a second support ring, a third circular ring is arranged inside the second support ring, the third circular ring is arranged concentrically with the second support ring, and a third connecting rod is arranged between the second support ring and the third circular ring; the third support retaining ring includes a third support ring, a fourth circular ring is arranged inside the third support ring, the centers of the fourth circular ring and the third support ring are on the same vertical line, and a fourth connecting rod is arranged between the fourth circular ring and the third support ring.

6. A drilling-spraying-cutting long-distance hole-forming-hole-protecting-transmittance-enhancing integrated construction method, which is implemented based on the drilling-spraying-cutting long-distance hole-forming-hole-protecting-transmittance-enhancing integrated device as claimed in any one of claims 1 to 5, characterized in that: The steps include: (1) Assembling the integrated device and drilling: first, the drill bit is installed on the screw motor, and then the screw motor is installed on the right end of the jet slot drill rod, and then the jet slot drill rod is installed on the right end of the non-magnetic drill rod through the fourth male thread and the third female thread, and then the non-magnetic drill rod is installed on the right end of the spray hole protection drill rod through the third male thread and the second female thread, and then the spray hole protection drill rod is installed on the right end of the double-channel cable drill rod through the second male thread and the first female thread, and then the drilling slot drill tail is installed on the left end of the double-channel cable drill rod through the first male thread and the fifth female thread, and finally the spray channel is blocked with a plug and the screw motor is driven by supplying water into the first flow supply channel to drive the drill bit to cut and break the coal; (2) Reverse spraying: After drilling a certain distance, remove the drilling slit drill tail, and install the spray drill tail on the left end of the drill rod with a double-channel cable through the drill tail adapter. Pull out the plug to make the spray channel unblocked and use a gear pump to inject spray material into the spray drill tail. At the same time, retract the drill at a low speed to perform reverse spraying. (3) After spraying is completed, drilling is carried out again, and the drilling cycle is repeated until the specified depth is reached. Then, the back-cutting is started, and high-pressure water is injected into the double-channel cable drill rod. The high-pressure water passes through the spray-coated hole-protecting drill rod and the non-magnetic drill rod and enters the jet-cutting drill rod for cutting, thereby realizing the integrated operation of drilling, spraying and cutting.

7. The integrated construction method of drilling-spraying-cutting long-distance hole forming-hole protection-permeability enhancement according to claim 6 is characterized in that: In step (1), before threading the components together, the first spray pipe and the second spray pipe are connected, as well as the first cable pipe and the second cable pipe are connected. After the first spray pipe and the second spray pipe and the first cable pipe and the second cable pipe are connected, threading the corresponding components is performed.

8. The integrated construction method of drilling-spraying-cutting long-distance hole-forming-hole-protecting-permeability-enhancing according to claim 7 is characterized in that: In step (2), after the left end of the spray drill tail is connected to the external spray feed pipe, the first sealing ring and the first bearing are tightly connected, after the left end of the drill tail converter is connected to the right end of the spray drill tail, the second sealing ring and the second bearing are tightly connected, the right end of the drill tail adapter is connected to the left end of the double-channel cable drill rod, the right end of the special-shaped connecting pipe is connected to the left end of the first spray pipe, and the left end of the special-shaped connecting pipe is connected to the discharge port of the feed channel through the second sealing ring and the second bearing.

9. The integrated construction method of drilling-spraying-cutting long-distance hole-forming-hole protection-permeability enhancement according to claim 8, characterized in that: In step (3), after the high-pressure water passes through the spray-coated hole-protecting drill rod and the non-magnetic drill rod and enters the jet cutting drill rod, it pushes the slider to move to the right and compresses the spring to make the slider slide away from the jet port. At this time, the upper plug protrusion and the lower plug protrusion on the slider are respectively inserted into the upper through hole and the lower through hole of the fixed block so that the high-pressure water can only be ejected from the jet cutting drill rod through the jet port to realize the cutting action.

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