A multi-angle directional jet slotting device for drilling and a method of use

Abstract

The application discloses a kind of drilling multi-angle directional jet slotting device and method, the device includes multimeter, and sequentially connected: directional device, anchoring slotting device, fixed-rotation dual-purpose joint, multimeter is electrically connected with directional device for calculating rotation angle by measuring resistance value.This application uses fixed-rotation dual-purpose joint to realize that jet slotting nozzle rotates with drill pipe or is fixed as axial movement, can be oriented slotting at any design angle in drilling hole;Using directional device realizes the rotation angle orientation function under the condition of different drilling angle;Using anchoring slotting device can carry out slotting to drilling hole under the condition of rear-end drill pipe rotation, and the coal cinder generated in slotting process is discharged in time, avoid the problem of hole blocking caused by poor drainage of drilling hole, by using this directional device and directional slotting method, greatly facilitate the guiding effect of coal seam slotting permeability and induced fracturing, can optimize slotting effect on the basis of saving slotting workload.

Description

Technical Field

[0001] This invention relates to the field of coal mine gas control, and in particular to a drilling multi-angle directional jet slit cutting device and its usage method. Background Technology

[0002] As coal mining depth increases, coal seam characteristics gradually shift towards low permeability, high gas content, and high ground stress. The contradiction between high gas content and low permeability leads to poor gas drainage and prolonged drainage time, severely impacting mining schedules. High ground stress, on the other hand, can cause increased roadway deformation and, if the roof doesn't collapse in time, stress concentration or rockburst accidents at the working face. Faced with coal mine gas and rockburst disasters, gas drainage and rock strata decompression are fundamental solutions. Various jet fracturing techniques can be applied not only in coal seam boreholes to fracture the surrounding coal, increasing permeability and promoting gas drainage, but also extensively in rock boreholes for rock strata decompression or forced roof breaking. Furthermore, the grooves formed within the borehole can provide initial guidance during fracturing, significantly improving fracturing effectiveness.

[0003] During jet permeation enhancement operations, due to the inability to precisely position the jet nozzle at an angle, current methods often employ rotating the drill rod to drive a front-end anchoring and cutting device, or adding a lateral nozzle to the anchoring and cutting device to cause it to rotate and cut. This method creates a circular slot perpendicular to the borehole axis. When water accumulates within the slot, it can form an elliptical fixed slot. Moving the drill rod back and forth during rotation creates a spiral slot. This method exhibits significant uncontrollability during borehole permeation enhancement or combined with fracturing permeation enhancement, failing to truly achieve the guiding function of fracturing boreholes, and even leading to… This causes the guide of the fracturing process to deflect; when the drill pipe is stopped from rotating, cutting and moving the drill pipe back and forth will create a slot that cuts the borehole in a direction parallel to the axis. However, slots with random directions or slots in only one direction do not have a precise permeability enhancement effect on a single borehole or the combined permeability enhancement effect of multiple boreholes. In the current concept of precise extraction and each borehole is a project, jet cutting operations with uncontrollable direction will seriously hinder the evaluation of the borehole extraction effect, thus causing the extraction effect assessment to fail, affecting the economics of the borehole, and may even cause a gas accident. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a drilling multi-angle directional jet slit cutting device and its usage method, which solves the problem of directional slit construction during water jetting.

[0005] This invention discloses a drilling multi-angle directional jet slit cutting device, including a multimeter, and sequentially connected: a directional device, an anchoring slit cutting device, and a fixed-rotation dual-purpose connector. The directional device includes: a directional device body, with a rotor rotating shaft fixedly mounted axially inside the directional device body. A connecting rod is rotatably connected to the rotor rotating shaft, with a counterweight at one end and a conductive block at the other end. The rotor rotating shaft is electrically connected to a first wire. The directional device body also includes an annular resistor, which includes an insulating layer and a conductive ring disposed on the insulating layer. The conductive ring has an insulation break point, and a second wire is electrically connected to one end of the conductive ring at the insulation break point. The first and second wires are also electrically connected to the multimeter.

[0006] The anchoring slit cutting device includes: an anchoring slit cutting device body with an inner cavity, jet slit cutting nozzles, and a one-way anchoring wheel. Jet slit cutting nozzles communicating with the inner cavity are respectively arranged on the left and right sides of the anchoring slit cutting device body, allowing the jet medium in the inner cavity to perform slit cutting operations through the jet slit cutting nozzles. A pair of guide cavities are arranged on the upper and lower sides of the anchoring slit cutting device body, communicating with the inner cavity, with the outlets of the two guide cavities on the same side facing each other. A guide rod is provided inside the guide cavity, and a first spring is wound around the guide rod. The front end of the guide rod can extend outward from the outlet of the guide cavity under the pressure of the jet medium inside the guide cavity, and the first spring is compressed. A support rod is hinged to the front end of the guide rod, with the hinge point being one end of the support rod. The other end of each support rod on the same side is hinged to a common one-way anchoring wheel.

[0007] The fixed-rotary dual-purpose connector includes: a telescopic sleeve, a rotary sleeve, a connector chuck, and a connector shaft with a central water passage hole. One end of the connector shaft is fixed inside the cavity of the rotary sleeve. The cavity of the telescopic sleeve is provided with a guide groove. The other end of the connector shaft, located inside the cavity of the telescopic sleeve, is provided with a guide block, allowing it to slide within the guide groove. A second spring is also provided inside the telescopic sleeve and wound around the connector shaft. When no jet medium is introduced into the fixed-rotary dual-purpose connector, the telescopic sleeve and the rotary sleeve form a coupling structure through the connector chuck under the influence of the force of the second spring. When a jet medium is introduced into the fixed-rotary dual-purpose connector, the connector shaft is pressed outward from the telescopic sleeve, the second spring is compressed, and the rotary sleeve moves forward away from the telescopic sleeve.

[0008] Furthermore, in the orientation device:

[0009] The directional device body is equipped with a limiting step inside, and the other end of the connecting rod is also equipped with a support block facing the opposite direction to the conductive block. The support block is in contact with the limiting step.

[0010] The connecting rod has a ring structure at the connection with the rotor rotating shaft, which is limited by the rotor rotating shaft step and the first shaft by a spring retainer.

[0011] The directional device body also has a first hole with a spring retainer, and the annular resistor is limited by a second hole with a spring retainer.

[0012] Furthermore, in the anchoring slit device:

[0013] The anchoring and cutting device body includes a male connector section, an anchoring section, and a female connector section that are connected in sequence by threads.

[0014] The guide cavity is provided with a third hole spring retainer, which is used to limit the guide rod as it passes through the first spring and the third hole spring retainer.

[0015] The axis of the unidirectional anchoring wheel is parallel to the axis of the jet cutting nozzle;

[0016] The unidirectional anchoring wheel has a shuttle-shaped cross-section and a circular cross-section.

[0017] The inner cavity of the anchoring and cutting device body is provided with an end seal at one end near the orientation device, and a through hole is provided in the center for sealing the anchoring and cutting device and allowing the wire to pass through.

[0018] Furthermore, in a fixed-rotation dual-purpose connector:

[0019] The joint shaft is limited by a second spring, a second shaft spring retainer, and a third hole spring retainer; the coupling structure is a claw-type coupling structure.

[0020] Furthermore, the anchoring and cutting device is connected to the fixed-rotation dual-purpose connector, and the orientation device is connected to the anchoring and cutting device by threaded connection.

[0021] The present invention also discloses a drilling multi-angle directional jet slit cutting system, including the drilling multi-angle directional jet slit cutting device as described above, and further including, in sequence: a high-pressure pump, a high-pressure hose, a drilling machine, and a drill rod, wherein the drill rod is also connected to the drilling multi-angle directional jet slit cutting device.

[0022] This invention also discloses a method of using a multi-angle directional jet slit cutting device for drilling, comprising:

[0023] S1: Connect the drilling multi-angle directional jet cutting device, drill rod, high-pressure hose, and high-pressure pump in sequence.

[0024] S2: Before drilling, use a multimeter to test the signal transmission performance and the accuracy of the resistance measurement, and record the correspondence between the resistance value and the rotation angle of the anchoring slit cutting device.

[0025] S3: Send the directional device, anchoring slit device, and fixed-rotation dual-purpose connector into the borehole through the drill rod. After the jet slit nozzle reaches the designed position, slowly rotate the drill rod through the drill rig. At the same time, use a multimeter to test the range of resistance value change and calculate the angle position of the jet slit nozzle. Stop the drill rig rotation after rotating to the predetermined angle.

[0026] S4: Connect the high-pressure water to start rock breaking. After the borehole starts to drain water, rotate and move the drill rod back and forth to form a slot. At the same time, monitor the stability of the angle of the anchoring and cutting device.

[0027] S5: After cutting to the designed length, turn off the high-pressure water, depressurize, adjust the number of drill rods in the borehole or the angle of the anchor cutting device, and start the next stage of cutting operation.

[0028] S6: Repeat steps S4 and S5 until the drilling and slit cutting operation is completed, then remove the drill rod and the multi-angle directional jet slit cutting device.

[0029] Furthermore, for the accuracy test in step S2, measurements should be taken at three different rotation angles and compared with the measurements from the angle ruler, with an allowable error range of ±3°.

[0030] Further, in step S2, the relationship between the resistance value and the rotation angle is as follows: Let α be the location of the insulation break in the conductive ring. Use a multimeter to measure the initial resistance value R1 and the maximum resistance value R2. Then, the angle corresponding to any resistance value R is:

[0031] α - 360° * R / (R2 - R1)

[0032] By recording the relationship between the initial α and the slit nozzle angle, the angular position of the slit nozzle can be determined through the resistance value.

[0033] The test resistance range in step S3 and the angle calculation method are the same as in step S2.

[0034] Furthermore, in step S4, the angular stability of the anchoring slit device must meet the requirement that the angular change value is within ±3°.

[0035] The present invention has at least the following beneficial effects:

[0036] This invention employs a dual-purpose fixed-rotation connector to enable the jet slitting nozzle to rotate with the drill rod or be fixed to move axially, allowing for directional slitting at any designed angle within the borehole. A directional device enables rotational angle orientation under different borehole angle conditions. An anchored slitting device allows for slitting of the borehole while the rear drill rod is rotating, and timely discharge of coal slag generated during the slitting process, avoiding borehole blockage due to poor slag discharge. By using this directional device and directional slitting method, the guiding effect of coal seam slitting for permeability enhancement and induced fracturing is greatly facilitated, optimizing the slitting effect while saving slitting workload.

[0037] Other beneficial effects of the present invention will be described in detail in the Detailed Description of the Embodiments section. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 The diagram below shows the construction operation connection of the drilling multi-angle directional jet slitting device disclosed in a preferred embodiment of the present invention.

[0040] Figure 2 This is a structural diagram of the orientation device disclosed in a preferred embodiment of the present invention.

[0041] Figure 3 for Figure 2 Cross-sectional view along the AA direction.

[0042] Figure 4 for Figure 2 Cross-sectional view along the BB direction.

[0043] Figure 5 This is a structural diagram of the anchoring and slit-cutting device disclosed in a preferred embodiment of the present invention.

[0044] Figure 6 for Figure 5 Cross-sectional view along the AA direction.

[0045] Figure 7 This is a diagram showing the usage state of the anchoring and cutting device disclosed in a preferred embodiment of the present invention.

[0046] Figure 8 This is a structural diagram of a fixed-rotation dual-purpose connector disclosed in a preferred embodiment of the present invention.

[0047] Figure 9 for Figure 8Cross-sectional view along the AA direction.

[0048] Figure 10 This is a diagram showing the usage state of the fixed-rotation dual-purpose connector disclosed in a preferred embodiment of the present invention.

[0049] Figure 11 for Figure 10 Cross-sectional views along the BB and CC directions.

[0050] Figure 12 This is a flowchart illustrating the usage method of the drilling multi-angle directional jet slit cutting device disclosed in a preferred embodiment of the present invention.

[0051] Figure 13 This is a diagram illustrating the effect of directional jet slit cutting, as disclosed in a preferred embodiment of the present invention.

[0052] Figure 14 This is an illustration of another directional jet slit effect disclosed in a preferred embodiment of the present invention.

[0053] Among them, 1-directional device, 2-anchoring and slotting device, 3-fixed and rotating dual-purpose connector, 4-multimeter, 5-coal seam, 6-drill hole, 7-drill rod, 8-drilling rig, 9-high pressure hose, 10-high pressure pump, 100-directional device body, 101-wire, 1031-ring resistor, 1032-spring retainer for first hole, 1033-limiting step, 1034-conductive ring, 1035-insulating layer, 1041-counterweight, 1042-connecting rod, 1043-rotor rotating shaft, 1044-support block, 200-anchoring and slotting device The components are: main body, 201-jet slit nozzle, 2021-guide rod, 2022-first spring, 2023-support rod, 2024-one-way anchoring wheel, 2025-spring retainer for second hole, 2031-fastening sealing bolt, 2032-rubber sealing ring, 301-telescopic sliding sleeve, 302-rotating sliding sleeve, 303-guide groove, 3041-connector shaft, 3043-second spring, 305-connector chuck, 306-spring retainer for shaft, 307-spring retainer for third hole, 3042-guide block, 308-water passage hole. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0055] like Figures 1 to 11As shown, this invention discloses a multi-angle directional jet slitting device for drilling, capable of entering a borehole 6 in a coal seam 5 for jet slitting operations. It includes a multimeter 4, and sequentially connected components: a directional device 1, an anchoring slitting device 2, and a fixed-rotation dual-purpose connector 3. The directional device 1 includes a directional device body 100, with a rotor rotating shaft 1043 fixedly arranged axially inside the directional device body 100. A connecting rod 1042 is rotatably connected to the rotor rotating shaft 1043, and a counterweight is provided at one end of the connecting rod 1042. 1041, with a conductive block at the other end, and the rotor rotating shaft 1043 electrically connected to a first wire (wire 101); the orientation device body 100 is also provided with an annular resistor 1031, the annular resistor 1031 including an insulating layer 1035 and a conductive ring 1034 disposed on the insulating layer 1035, the conductive ring 1034 having an insulation break, and a second wire (wire 101) electrically connected to one end of the conductive ring 1034 at the insulation break; the first wire and the second wire are also electrically connected to the multimeter 4 respectively.

[0056] In some preferred embodiments of the present invention, the orientation device 1 includes: an orientation device body 100, a resolver, wires, and a multimeter 4. The resolver consists of a rotor, a stator, and wires. The rotor has an irregular shape and rotates around its central axis, maintaining one end facing downwards under the influence of gravity. Specifically, the rotor mainly consists of a counterweight 1041, a connecting rod 1042, a conductive block, and a support block 1044. The rotor rotation shaft 1043 is connected to the bottom surface of the orientation device body 100 and has a stepped upper part. The connecting rod 1042 has a ring structure at the connection point with the rotor rotation shaft 1043, which is limited by the rotor rotation shaft step and a shaft spring retainer 306. Through this structure, the connecting rod 1042 is connected to the rotor rotation shaft 1043 and rotates with the connection point as the rotation center. The conductive block is in contact with the conductive ring 1034 in the middle of the annular resistor sheet 1031. The conductive block is a spindle-shaped conductor. The support block 1044 is in contact with the limiting step 1033 of the orientation device body 100. The stator is a ring-shaped resistor 1031, with a conductive ring 1034 in the middle of the ring, and the rest of the ring is an insulating area. The resistor is limited by a spring retainer 1032 through a first hole. The conductive ring 1034 has a broken strip at one point. There are two wires in total. The first wire is connected to the end of the rotor shaft 1043, and the second wire is connected to one end of the ring-shaped resistor 1031 at the point where the insulation is broken.

[0057] The anchoring slit-cutting device 2 includes: an anchoring slit-cutting device body 200 with an inner cavity, a jet slit-cutting nozzle 201, and a one-way anchoring wheel 2024. The anchoring slit-cutting device body 200 has jet slit-cutting nozzles 201 connected to the inner cavity on its left and right sides, allowing the jet medium in the inner cavity to perform slit-cutting operations through the jet slit-cutting nozzles 201. A pair of guide cavities are provided on both the upper and lower sides of the anchoring slit-cutting device body 200, connected to the inner cavity, with the outlets of the two guide cavities on the same side facing each other. A guide rod 2021 is provided inside the guide cavity, and a first spring 2022 is wound around the guide rod 2021. The front end of the guide rod 2021 can extend outward from the outlet of the guide cavity under the pressure of the jet medium inside the guide cavity, and the first spring 2022 is compressed. A support rod 2023 is hinged to the front end of the guide rod 2021, with the hinge point being one end of the support rod 2023. The other end of each support rod 2023 on the same side is hinged to a common one-way anchoring wheel 2024.

[0058] In some preferred embodiments of the present invention, the directional device 1 and the anchoring slit device 2 are connected by threads. The anchoring slit device 2 mainly consists of an anchoring slit device body 200, a one-way anchoring device, a jet slit nozzle 201, and an end seal. The anchoring slit device body 200 includes a male connector section, an anchoring section, and a female connector section, with adjacent sections connected by threads. The one-way anchoring device includes a guide rod 2021, a first spring 2022, a support rod 2023, and a one-way anchoring wheel 2024. The guide rod 2021 is limited by the first spring 2022 and a spring retainer 2025 in the second hole. The support rod 2023 is hinged to the guide rod 2021 and the one-way anchoring wheel 2024. The axis of the one-way anchoring wheel 2024 is parallel to the axis of the jet slit nozzle 201.

[0059] like Figure 7 As shown, the guide rod 2021 is pushed by the jet medium, and the guide rod 2021 acts on the support rod 2023 through the rotating shaft. The support rods 2023 on the upper and lower sides of the anchoring and cutting device body 200 support the one-way anchoring wheel 2024, and the jet medium performs the cutting operation through the nozzle. The one-way anchoring wheel 2024 has a spindle-shaped cross-section. Under the force of the support rod 2023, it can generate pressure on the coal body to destroy it. Under the continuous pressure of the jet medium, the anchoring and cutting device 2 can be controlled to prevent rotation. The one-way anchoring wheel 2024 has a circular cross-section and can roll along the hinge axis to control the movement of the anchoring and cutting device 2 along the axial direction of the body.

[0060] The end seal consists of a sealing bolt 2031 and a rubber sealing ring 2032, which can seal the anchoring slit device 2 and allow the wire to pass through.

[0061] The dual-purpose fixed-rotation connector 3 includes: a telescopic sliding sleeve 301, a rotating sliding sleeve 302, a connector chuck 305, and a connector shaft 3041 with a central water passage hole 308. One end of the connector shaft 3041 is fixed inside the cavity of the rotating sliding sleeve 302. The cavity of the telescopic sliding sleeve 301 is provided with a guide groove 303. The other end of the connector shaft 3041, located inside the cavity of the telescopic sliding sleeve 301, is provided with a guide block 3042, allowing it to slide within the guide groove 303. The telescopic sliding sleeve 301... A second spring 3043 is also provided around the joint shaft 3041, so that when no jet medium is introduced into the fixed-rotation dual-purpose joint 3, the telescopic sleeve 301 and the rotating sleeve 302 form a coupling structure through the joint chuck 305 under the influence of the force of the second spring 3043; when the jet medium is introduced into the fixed-rotation dual-purpose joint 3, the joint shaft 3041 is pressed outward of the telescopic sleeve 301, the second spring 3043 is compressed, and the rotating sleeve 302 moves forward away from the telescopic sleeve 301.

[0062] In some preferred embodiments of the present invention, the dual-purpose fixed-rotation connector 3 includes a telescopic sleeve 301 and a rotating sleeve 302. The angular displacement lock between the telescopic sleeve 301 and the rotating sleeve 302 is released by the pressure of the jet medium, forming a rotary connector. The telescopic sleeve 301 and the rotating sleeve 302 are connected by a connector shaft 3041. The connector shaft 3041, which has a water passage hole 308 in the center, is limited by a second spring 3043, a second shaft spring retainer 306, and a third hole spring retainer 307. The opposing surfaces of the telescopic sleeve 301 and the rotating sleeve 302 have a claw-type coupling structure. The telescopic sleeve 301 has a guide groove 303 inside its cavity, and the connector shaft 3041 has a guide block 3042 at one end inside the telescopic sleeve 301, allowing it to slide within the guide groove 303 of the telescopic sleeve 301. When the high-pressure jet medium is not introduced, the joint shaft 3041 is retracted in the telescopic sleeve 301, and the coupling is in the connected state; when the high-pressure jet medium is introduced into the system, the joint shaft 3041 is pushed out from the telescopic sleeve 301, the rotating sleeve 302 moves forward, and disengages from the telescopic sleeve 301.

[0063] The present invention also discloses a drilling multi-angle directional jet slit cutting system, including the above-mentioned drilling multi-angle directional jet slit cutting device, and further including, in sequence: a high-pressure pump 10, a high-pressure hose 9, a drill rig 8, and a drill rod 7, wherein the drill rod 7 is also connected to the drilling multi-angle directional jet slit cutting device.

[0064] like Figure 12 As shown, the present invention also discloses a method for using a multi-angle directional jet slit cutting device for drilling, which mainly includes the following steps:

[0065] Step 1: Drill holes and connect the complete set of equipment.

[0066] Step 2: The anchoring slit device is delivered to the designed slit depth.

[0067] Step 3: Adjust the (jet) slit nozzle angle to the design value.

[0068] Step 4: Connect the high-pressure water, open the anchoring and cutting device, and open the fixed and rotating dual-purpose connector.

[0069] Step 5: Rotate the drill rod and move it back and forth to cut the slag and remove the slag. Detect the change in the angle of the anchoring slag cutting device, Δθ.

[0070] Step Six: Determine if the condition is met:

[0071] |△θ|<3°

[0072] If not, proceed to step seven; if yes, proceed to step eight.

[0073] Step 7: Depressurize, retract the directional anchor (directional anchoring device), and retract the rotary joint (fixed and rotary joint); then return to Step 3.

[0074] Step 8: Complete the cutting of this section, release the pressure, retract the directional anchor (directional anchoring device), retract the rotary joint (fixed and rotary dual-purpose joint), and proceed to Step 9.

[0075] Step 9: Determine whether drilling and slit cutting are complete. If yes, exit the complete set of equipment; if not, return to Step 2.

[0076] The method of using the multi-angle directional jet slit cutting device for drilling disclosed in this invention specifically includes:

[0077] S1: Connect the drilling multi-angle directional jet cutting device, drill rod, high-pressure hose, and high-pressure pump in sequence.

[0078] S2: Before drilling, use a multimeter to test the signal transmission performance and the accuracy of the resistance measurement, and record the correspondence between the resistance value and the rotation angle of the anchoring slit cutting device.

[0079] S3: Send the directional device, anchoring slit device, and fixed-rotation dual-purpose connector into the borehole through the drill rod. After the jet slit nozzle reaches the designed position, slowly rotate the drill rod through the drill rig. At the same time, use a multimeter to test the range of resistance value change and calculate the angle position of the jet slit nozzle. Stop the drill rig rotation after rotating to the predetermined angle.

[0080] S4: Connect the high-pressure water to start rock breaking. After the borehole starts to drain water, rotate and move the drill rod back and forth to form a slot. At the same time, monitor the stability of the angle of the anchoring and cutting device.

[0081] S5: After cutting to the designed length, turn off the high-pressure water, depressurize, adjust the number of drill rods in the borehole or the angle of the anchor cutting device, and start the next stage of cutting operation.

[0082] S6: Repeat steps S4 and S5 until the drilling and slit cutting operation is completed, then remove the drill rod and the multi-angle directional jet slit cutting device.

[0083] The technical solution will now be described in detail with reference to several preferred embodiments of the present invention.

[0084] Example 1

[0085] This embodiment discloses a drilling multi-angle directional jet slit cutting device, such as... Figures 1 to 11 As shown, from the bottom of the borehole, the components in sequence are: directional device 1, anchoring and slit-cutting device 2, fixed-rotation dual-purpose connector 3, and multimeter 4. Directional device 1 is used to measure the rotation angle of the jet slit-cutting nozzle 201. Directional device 1 includes an annular resistance element 1031 and a wire 101. The wire 101 is connected to the multimeter 4 outside the borehole. The rotation angle is calculated by measuring the resistance value. Directional device 1 and anchoring and slit-cutting device 2 are connected by threads. Under the water pressure inside the cavity, anchoring and slit-cutting device 2 pushes the support rod 2023 via the guide rod 2021, which in turn pushes the one-way anchoring wheel 2024. 24. Under pressure, it cuts into the coal body to prevent the angle of the jet cutting nozzle 201 from changing. Driven by the drill rod 7, it can move back and forth to form a slot. The anchor cutting device 2 and the fixed-rotation dual-purpose connector 3 are connected by threads. When there is no pressure in the cavity, the fixed-rotation dual-purpose connector 3 is subjected to the force of the second spring 3043. The telescopic sleeve 301 and the rotating sleeve 302 form a coupling structure through the connector chuck 305. When there is pressure in the cavity, the connector shaft 3041 extends out from the telescopic sleeve 301 to form a rotary connector, which can realize the rear drill rod 7 to rotate and discharge slag, and the front jet cutting nozzle 201 to cut at a fixed angle.

[0086] Example 2

[0087] This embodiment discloses a method for multi-angle directional jet slit cutting in boreholes, namely, a method for using a multi-angle directional jet slit cutting device in boreholes, mainly including the following steps:

[0088] Step 1: Connect the device in sequence as follows: directional device 1, anchoring and cutting device 2, fixed and rotating dual-purpose connector 3, drill rod 7, high-pressure hose 9, and high-pressure pump 10.

[0089] Step 2: Before drilling, use multimeter 4 to test the signal transmission performance and the accuracy of resistance measurement. After the test is correct, test and record the correspondence between the resistance value and the rotation angle of the jet slit nozzle 201, as well as the relationship between the break of the conductive ring 1034 and the angle of the jet slit nozzle 201.

[0090] Step 3: The device is carried by the drill rod 7 by the drill rig 8 and sent into the borehole 6 to the designed position;

[0091] Step 4: Slowly rotate the drill rod 7 using the drill rig 8, while simultaneously using a multimeter 4 to test the range of resistance changes, calculate the angle position of the jet cutting nozzle 201, and stop rotating the drill rig 8 after it reaches the predetermined angle.

[0092] Step 5: Connect the high-pressure water to start rock breaking. After the borehole starts to drain water, rotate the drill rod 7 to discharge the slag. At the same time, move the drill rod 7 back and forth to make jet cutting to form a slot. At the same time, monitor the angular stability of the jet cutting nozzle 201.

[0093] Step 6: After cutting the slit to the designed length, turn off the high-pressure water, depressurize, and then adjust the number of drill rods 7 in the hole to the next set position;

[0094] Step 7: Repeat steps 4, 5, and 6 until the drilling and slit cutting are completed, forming... Figure 13 The slit cutting effect shown is achieved by withdrawing the drill rod and the multi-angle directional jet slit cutting device from the borehole.

[0095] Example 3

[0096] This embodiment discloses another method for multi-angle directional jet slit cutting in boreholes, which mainly includes the following steps:

[0097] Step 1: Connect the device in sequence as follows: orientation device 1, anchoring and cutting device 2, fixed and rotating connector 3, drill rod 7, high-pressure hose 9, and high-pressure pump 10.

[0098] Step 2: Before drilling, use a multimeter 4 to test the signal transmission performance and the accuracy of the resistance measurement. After the test is successful, test and record the correspondence between the resistance value and the rotation angle of the jet slit nozzle 201, as well as the angle between the break of the conductive ring 1034 and the jet slit nozzle 201.

[0099] Step 3: The device is sent into the borehole 6 by the drill rig 8 carrying the drill rod 7. After the jet slit nozzle 201 reaches the designed position, the drill rod 7 is slowly rotated by the drill rig 8. At the same time, the resistance value change range is tested with a multimeter 4 to calculate the angular position of the jet slit nozzle 201. The drill rig 8 is stopped rotating after the predetermined angle is reached.

[0100] Step 4: Connect the high-pressure water to start rock breaking. After the drainage of the borehole 6 begins, rotate the drill rod 7 to discharge the slag. At the same time, move the drill rod 7 back and forth to form a slot by jet cutting. Meanwhile, monitor the angular stability of the jet cutting nozzle 201.

[0101] Step 5: After cutting the slit to the designed length, turn off the high-pressure water, release the pressure, and then adjust the angle of the jet slit nozzle 201 inside the hole to rotate to the designed position.

[0102] Step 6: Follow steps 4 and 5 to start the next angle cutting operation until the cutting operation of this section is completed. Adjust the number of drill rods 7 so that the jet cutting nozzle 201 reaches the next designed position.

[0103] Step 7: Repeat steps 4, 5, and 6 until the drilling and slit cutting are completed, forming... Figure 14 The cut effect shown is then observed, and the drill rod and this device are removed.

[0104] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A drilling multi-angle directional jet slit cutting device, characterized in that, The device includes a multimeter, and sequentially connected components: an orientation device, an anchoring and cutting device, and a fixed-rotation dual-purpose connector. The orientation device comprises: an orientation device body, inside which a rotor rotating shaft is fixedly mounted axially; a connecting rod is rotatably connected to the rotor rotating shaft; one end of the connecting rod has a counterweight, and the other end has a conductive block; the rotor rotating shaft is electrically connected to a first wire; the orientation device body also contains an annular resistor, which includes an insulating layer and a conductive ring disposed on the insulating layer; the conductive ring has an insulation break point, and one end of the conductive ring at the insulation break point is electrically connected to a second wire; the first and second wires are also electrically connected to the multimeter. The anchoring slit cutting device includes: an anchoring slit cutting device body with an inner cavity, jet slit cutting nozzles, and a one-way anchoring wheel. Jet slit cutting nozzles communicating with the inner cavity are respectively arranged on the left and right sides of the anchoring slit cutting device body, allowing the jet medium in the inner cavity to perform slit cutting operations through the jet slit cutting nozzles. A pair of guide cavities are arranged on the upper and lower sides of the anchoring slit cutting device body, communicating with the inner cavity, with the outlets of the two guide cavities on the same side facing each other. A guide rod is provided inside the guide cavity, and a first spring is wound around the guide rod. The front end of the guide rod can extend outward from the outlet of the guide cavity under the pressure of the jet medium inside the guide cavity, and the first spring is compressed. A support rod is hinged to the front end of the guide rod, with the hinge point being one end of the support rod. The other end of each support rod on the same side is hinged to a common one-way anchoring wheel. The fixed-rotary dual-purpose connector includes: a telescopic sleeve, a rotary sleeve, a connector chuck, and a connector shaft with a central water passage hole. One end of the connector shaft is fixed inside the cavity of the rotary sleeve. The cavity of the telescopic sleeve is provided with a guide groove. The other end of the connector shaft, located inside the cavity of the telescopic sleeve, is provided with a guide block, allowing it to slide within the guide groove. A second spring is also provided inside the telescopic sleeve and wound around the connector shaft. When no jet medium is introduced into the fixed-rotary dual-purpose connector, the telescopic sleeve and the rotary sleeve form a coupling structure through the connector chuck under the influence of the force of the second spring. When a jet medium is introduced into the fixed-rotary dual-purpose connector, the connector shaft is pressed outward from the telescopic sleeve, the second spring is compressed, and the rotary sleeve moves forward away from the telescopic sleeve.

2. The drilling multi-angle directional jet slit cutting device according to claim 1, characterized in that, In the orientation device: The directional device body is equipped with a limiting step inside, and the other end of the connecting rod is also equipped with a support block facing the opposite direction to the conductive block. The support block is in contact with the limiting step. The connecting rod has a ring structure at the connection with the rotor rotating shaft, which is limited by the rotor rotating shaft step and the first shaft by a spring retainer. The directional device body also has a first hole with a spring retainer, and the annular resistor is limited by a second hole with a spring retainer.

3. The drilling multi-angle directional jet slit cutting device according to claim 1, characterized in that, In the anchoring slit device: The anchoring and cutting device body includes a male connector section, an anchoring section, and a female connector section that are connected in sequence by threads. The guide cavity is provided with a third hole spring retainer, which is used to limit the guide rod as it passes through the first spring and the third hole spring retainer. The axis of the unidirectional anchoring wheel is parallel to the axis of the jet cutting nozzle; The unidirectional anchoring wheel has a shuttle-shaped cross-section and a circular cross-section. The inner cavity of the anchoring and cutting device body is provided with an end seal at one end near the orientation device, and a through hole is provided in the center for sealing the anchoring and cutting device and allowing the wire to pass through.

4. The drilling multi-angle directional jet slit cutting device according to claim 1, characterized in that, In a fixed-rotation dual-purpose connector: The joint shaft is limited by a second spring, a second shaft spring retainer, and a third hole spring retainer; the coupling structure is a claw-type coupling structure.

5. The drilling multi-angle directional jet slit cutting device according to claim 1, characterized in that, The anchoring and cutting device is connected to the fixed-rotation dual-purpose joint, and the orientation device is connected to the anchoring and cutting device by threaded connection.

6. A drilling multi-angle directional jet slit cutting system, characterized in that, The drilling multi-angle directional jet slit cutting device as described in any one of claims 1 to 5 further includes, in sequence: a high-pressure pump, a high-pressure hose, a drilling rig, and a drill rod, wherein the drill rod is also connected to the drilling multi-angle directional jet slit cutting device.

7. The method of using the drilling multi-angle directional jet slit cutting device as described in any one of claims 1 to 5, characterized in that, include: S1: Connect the drilling multi-angle directional jet cutting device, drill rod, high-pressure hose, and high-pressure pump in sequence. S2: Before drilling, use a multimeter to test the signal transmission performance and the accuracy of the resistance measurement, and record the correspondence between the resistance value and the rotation angle of the anchoring slit cutting device. S3: Send the directional device, anchoring slit device, and fixed-rotation dual-purpose connector into the borehole through the drill rod. After the jet slit nozzle reaches the designed position, slowly rotate the drill rod through the drill rig. At the same time, use a multimeter to test the range of resistance value change and calculate the angle position of the jet slit nozzle. Stop the drill rig rotation after rotating to the predetermined angle. S4: Connect the high-pressure water to start rock breaking. After the borehole starts to drain water, rotate and move the drill rod back and forth to form a slot. At the same time, monitor the stability of the angle of the anchoring and cutting device. S5: After cutting to the designed length, turn off the high-pressure water, depressurize, adjust the number of drill rods in the borehole or the angle of the anchor cutting device, and start the next stage of cutting operation. S6: Repeat steps S4 and S5 until the drilling and slit cutting operation is completed, then remove the drill rod and the multi-angle directional jet slit cutting device.

8. The method of using the drilling multi-angle directional jet slit cutting device according to claim 7, characterized in that, To test the accuracy in step S2, measurements should be taken at three different rotation angles and compared with the measurements from an angle gauge. The allowable error range is ±3°.

9. The method of using the drilling multi-angle directional jet slit cutting device according to claim 7, characterized in that, In step S2, the relationship between the resistance value and the rotation angle is as follows: Let α be the location of the insulation break in the conductive ring. Use a multimeter to measure the initial resistance value R1 and the maximum resistance value R2. Then, the angle corresponding to any resistance value R is: α - 360° * R / (R2 - R1) By recording the relationship between the initial α and the slit nozzle angle, the angular position of the slit nozzle can be determined through the resistance value. The test resistance range in step S3 and the angle calculation method are the same as in step S2.

10. The method of using the drilling multi-angle directional jet slit cutting device according to claim 7, characterized in that, In step S4, the angular stability of the anchoring and cutting device must meet the requirement that the angular change value is within ±3°.

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