Sealed self - switching multi - path wired transmission drill pipe and method for underground directional drilling in coal mines

Abstract

The present invention provides a sealed self - on - off multi - path wired transmission drill pipe and method for directional drilling in coal mines. The drill pipe includes a drill pipe body, and the hollow channel inside the drill pipe body is a water - passing channel. The drill pipe body includes a male connector, a rod body, and a female connector that are integrally and coaxially connected. A multi - path male connection assembly is arranged inside the male connector, a multi - path female connection assembly is arranged inside the female connector, and a wire threading pipe is arranged inside the rod body. A multi - path shielded cable laid inside the wire threading pipe connects the multi - path male connection assembly and the multi - path female connection assembly. The wired transmission drill pipe is in a sealed state initially and when connected; when providing high - pressure flushing fluid to the borehole for directional drilling, the adjacent multi - path male connection assembly and multi - path female connection assembly are connected, and the transmission path is switched on to achieve efficient bidirectional signal and unidirectional electric energy transmission; after the directional drilling is completed, the supply of flushing fluid is stopped, and the wired transmission drill pipe returns to the sealed state.

Description

Technical Field

[0001] The present invention belongs to the technical field of underground coal mine tunnel drilling, and relates to a wired transmission drill pipe, in particular to a sealed self - switching multi - path wired transmission drill pipe for underground coal mine directional drilling and a using method thereof. Background Art

[0002] The nearly horizontal directional drilling in underground coal mines is an effective technical means for mine geological exploration and disaster prevention and control. The directional drill pipe is one of the important components of the underground coal mine directional drilling equipment. It mainly functions to transmit the drilling power of the drill rig, convey the flushing fluid provided by the mud pump, and assist in the communication of data inside and outside the hole of the measurement - while - drilling system. According to the data transmission method of the directional drill pipe, it can be divided into wired transmission drill pipes and wireless transmission drill pipes. Among them, the wireless transmission drill pipe is mainly used in cooperation with the wireless measurement - while - drilling system and has a simple structure. The wired transmission drill pipe is mainly used in cooperation with the wired measurement - while - drilling system. Currently, the central - through - cable structure is mainly adopted. For example, the Chinese invention patent with the application publication number CN101082268A discloses a central - through - cable high - strength large - through - hole drill pipe, which realizes the high - speed two - way signal transmission inside and outside the hole. However, it has the following deficiencies in actual use:

[0003] (A) Few signal transmission paths. Affected by the central - through - cable structure, the existing wired transmission drill pipe uses its special central - through - cable device as the signal line and the drill pipe body as the ground wire. There are only two transmission paths in total, which limits the signal transmission method and speed, and has a single function, restricting the development of the multi - parameter measurement - while - drilling system.

[0004] (B) High connection failure rate. When connecting the central - through - cable wired transmission drill pipe, the drill pipe body and the central - through - cable device are connected synchronously. The central - through - cable device needs to bear a large torque and thrust, and it is extremely easy to cause connection damage, resulting in a relatively high overall failure rate of the drill pipe and affecting the transmission stability.

[0005] (C) Lack of safety protection for the central - through - cable device. The central - through - cable device has been in an exposed state and is extremely easy to be damaged during the connection, disassembly, transportation, etc. of the wired transmission drill pipe. At the same time, after the central - through - cable wired transmission drill pipe is connected, the central - through - cable device has been in a connected state, and there is a potential live risk in the explosive gas environment in underground coal mines. Summary of the Invention

[0006] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a sealed self - switching multi - path wired transmission drill pipe for underground coal mine directional drilling and a using method thereof, so as to solve the technical problem that the performance of the existing wired transmission drill pipe needs to be further improved.

[0007] To solve the above - mentioned technical problems, the present invention adopts the following technical solutions to achieve:

[0008] A sealed self - on - off multi - path wired transmission drill pipe for directional drilling underground in coal mines, comprising a drill pipe body. The hollow channel inside the drill pipe body is a water - passing channel. The drill pipe body includes a male connector, a rod body, and a female connector that are integrally and coaxially connected. A multi - path male connection assembly is arranged inside the male connector, a multi - path female connection assembly is arranged inside the female connector, and a wire threading pipe is arranged inside the rod body. A multi - path shielded cable laid inside the wire threading pipe connects the multi - path male connection assembly and the multi - path female connection assembly.

[0009] The present invention also has the following technical features:

[0010] Specifically:

[0011] The male connector is provided with a first annular groove, a second annular groove, and a third annular groove that are sequentially connected from the outer end to the inner end. The inner diameters of the first annular groove, the second annular groove, and the third annular groove decrease in sequence. Two male - head positioning bosses are arranged on the inner end face at the bottom of the first annular groove. The outer end of a first axial through - hole communicates with the bottom of the third annular groove. A radial water - passing hole communicating with the water - passing channel is arranged on the side wall of the third annular groove.

[0012] The female connector is provided with a fourth annular groove and a fifth annular groove that are sequentially connected from the outer end to the inner end. The inner diameters of the fourth annular groove and the fifth annular groove decrease. Two female - head positioning bosses are arranged on the end face at the bottom of the fourth annular groove. The outer end of a second axial through - hole communicates with the bottom of the fifth annular groove.

[0013] The multi - path male connection assembly includes a first inner elastic sealing plug and a first outer elastic sealing plug installed in the first annular groove. The first inner elastic sealing plug is coaxially sleeved inside the first outer elastic sealing plug and is fixed by a first inner fixing ring and a first outer fixing ring connected in the first annular groove. A first seal - passing channel is formed between the first inner elastic sealing plug and the first outer elastic sealing plug.

[0014] The multi - path male connection assembly further includes multi - path male connectors installed in the second annular groove and limited by a first inner limiting ring and a first outer limiting ring connected to the outer end inside the second annular groove. Inner springs and outer springs are respectively sleeved on the inner and outer sides of the multi - path male connectors. The outer ends of the inner springs and the outer springs respectively abut against the first inner limiting ring and the first outer limiting ring, and the inner ends of the inner springs and the outer springs respectively abut against the sealing and guiding bosses at the inner ends of the multi - path male connectors, enabling the multi - path male connectors to perform telescopic movement in the second annular groove, and the outer ends of the multi - path male connectors can pass through the first seal - passing channel and extend to the outer end of the first annular groove.

[0015] The multi-way female connection component described above includes a second inner elastic seal plug and a second outer elastic seal plug installed in the fourth annular groove. The second inner elastic seal plug is coaxially sleeved inside the second outer elastic seal plug and is fixed by a second inner fixing ring and a second outer fixing ring connected in the fourth annular groove. A second penetrable seal channel is formed between the second inner elastic seal plug and the second outer elastic seal plug.

[0016] The multi-way female connection component also includes a multi-way female connector installed in the fifth annular groove and is limited by a second inner limit ring connected in the fifth annular groove.

[0017] The multi-way male connector and the multi-way female connector are electrically connected through a multi-way shielded cable.

[0018] Furthermore:

[0019] Preferably, the first inner elastic seal plug and the second inner elastic seal plug have the same structure. The first inner elastic seal plug is of an annular structure. An outer serrated seal opening is provided on the outer side wall of the first inner elastic seal plug. An inner limit step is provided at the outer end on the inner side wall of the first inner elastic seal plug. The inner limit step contacts and limits the first inner fixing ring. An inner positioning groove is provided on the inner end face of the first inner elastic seal plug. The inner positioning groove cooperates with the male head positioning boss to achieve positioning.

[0020] Preferably, the first outer elastic seal plug and the second outer elastic seal plug have the same structure. The first outer elastic seal plug is of an annular structure. An inner serrated seal opening is provided on the inner side wall of the first outer elastic seal plug. An outer limit step is provided at the outer end on the outer side of the first outer elastic seal plug. The outer limit step contacts and limits the first outer fixing ring. An outer positioning groove is provided on the inner end face of the first outer elastic seal plug. The outer positioning groove cooperates with the male head positioning boss to achieve positioning.

[0021] A first penetrable seal channel is formed between the outer serrated seal opening and the inner serrated seal opening.

[0022] Preferably, the multi-way male connector is an integrally formed annular structure, including a first annular conductor. Two or more conductive bosses are provided at the outer end of the first annular conductor. Inner and outer male head conductive rings that are isolated from each other are provided on the inner and outer sides of each conductive boss. A seal guiding boss is provided at the inner end of the first annular conductor. A first connection port is provided inside the seal guiding boss. The first connection port is electrically connected and conducted to each male head conductive ring.

[0023] Preferably, the multi-way female connector is an integrally formed annular structure, including a second annular conductor. The outer end of the second annular conductor is provided with two or more conductive grooves. Inner and outer sides of each conductive groove are provided with female head conductive rings isolated from each other. The inner end of the second annular conductor is provided with a second connection port, and the second connection port is electrically connected and conducted with each female head conductive ring; a limiting groove is arranged inside the second annular conductor, and the limiting groove contacts and limits with the second inner limiting ring.

[0024] Preferably, the conductive boss and the conductive groove are correspondingly inserted and matched to realize electrical connection and conduction.

[0025] Preferably, one end of the multi-way shielded cable is electrically connected and conducted with the first connection port of the multi-way male connector and is glued and sealed in the first connection port; the other end of the multi-way shielded cable is electrically connected and conducted with the second connection port of the multi-way female connector and is glued and sealed in the second connection port.

[0026] Preferably, the outer diameters of the male connector and the female connector are the same as the outer diameter of the rod body, and the inner diameters of the male connector and the female connector are larger than the inner diameter of the rod body.

[0027] Preferably, the conduit is welded inside the rod body, and two sections of the conduit are respectively communicated with the inner ends of the first axially through hole and the second axially through hole.

[0028] Preferably, the multi-way shielded cable is laid in a channel formed by the first axially through hole, the conduit and the second axially through hole. The middle of the multi-way shielded cable is glued and sealed in the conduit, and telescopic margins are left at both ends of the multi-way shielded cable.

[0029] The present invention also protects a use method of the sealed self-switching multi-way wired transmission drill pipe for underground directional drilling in coal mines as described above. The method includes the following steps:

[0030] Step 1, initial sealing state:

[0031] Under the action of the inner spring and the outer spring, the multi-way male connector is entirely located in the second annular groove, and the first penetrable sealing channel between the first inner elastic sealing plug and the first outer elastic sealing plug is closed to protect the multi-way male connector by sealing; the multi-way female connector is always located in the fifth annular groove, and the second penetrable sealing channel between the second inner elastic sealing plug and the second outer elastic sealing plug is closed to protect the multi-way female connector by sealing;

[0032] Step 2, connection of the wired transmission drill pipe:

[0033] During directional drilling, when it is necessary to add a wired transmission drill pipe, connect the male joint of the drill pipe body to the female joint of the drill pipe body on the directional drilling rig, and then connect the supporting rotary water feeder; during and after the connection process, the wired transmission drill pipe always maintains the initial sealed state;

[0034] Step Three, Connect the Transmission Path:

[0035] Start the mud pump and supply high-pressure flushing fluid to the directional borehole through the rotary water feeder. After the flushing fluid enters the drill pipe body, it enters the third annular groove along the radial water holes and the first axial through holes, pushing the multi-way male connector to move, compressing the inner spring and the outer spring, so that the multi-way male connector passes through the first sealable passage between the first inner elastic seal plug and the first outer elastic seal plug, and is squeezed into the second sealable passage between the second inner elastic seal plug and the second outer elastic seal plug until the male head conductive ring of the multi-way male connector is completely connected to the female head conductive ring of the multi-way female connector; the wired transmission drill pipe connects the downhole measurement probe and the surface explosion-proof computer;

[0036] Step Four, Directional Drilling with Measurement While Drilling:

[0037] Start the directional drilling rig for directional drilling. During the directional drilling process, send the control instructions of the surface explosion-proof computer to the downhole measurement probe through the wired transmission drill pipe and supply power to the downhole measurement probe; the downhole measurement probe works according to the control instructions of the surface explosion-proof computer, and uploads the measured downhole information to the surface explosion-proof computer in real time through the wired transmission drill pipe, which is processed and displayed by the explosion-proof computer to provide a decision-making basis for the driller;

[0038] Step Five, Disconnect the Transmission Path:

[0039] After the construction of a single drill pipe is completed, turn off the mud pump. The multi-way male connector resets under the action of the inner spring and the outer spring. The first inner elastic seal plug and the first outer elastic seal plug are tightly attached to seal the first sealable passage. The second inner elastic seal plug and the second outer elastic seal plug are tightly attached to seal the second sealable passage;

[0040] Step Six, Withdraw the Drill Pipe and Seal the Hole:

[0041] Repeat Steps Two to Five for directional borehole construction until the designed depth is reached. Withdraw the wired transmission drill pipe in the hole and connect the surface pipeline to seal the hole.

[0042] Compared with the prior art, the present invention has the following technical effects:

[0043] (Ⅰ) The present invention has multiple signal transmission paths. Multiple male connectors, multiple female connectors, and multiple shielded cables are used for signal transmission. The number of transmission channels is not limited by the structure and can be set according to needs, creating conditions for the synchronous and rapid transmission of electric energy and various measurement signals.

[0044] (Ⅱ) The present invention has a low connection failure rate. The connection of the drill pipe body and the signal transmission path connection are divided into two parts with asynchronous operations. When connecting the drill pipe body, the multiple male connection components and multiple female connection components are always in a sealed protection state, and the connection torque and propulsion force will not act on the multiple male connection components and multiple female connection components, improving the service life of the multiple male connection components and multiple female connection components.

[0045] (Ⅲ) The present invention reduces abnormal damage. In the non-working state, the multiple male connection components and multiple female connection components are always in a sealed protection state, avoiding abnormal damage to the transmission components during the connection, disconnection, and transportation of the wired transmission drill pipe.

[0046] (Ⅳ) The transmission path of the present invention is automatically connected and disconnected. The high-pressure flushing fluid for directional drilling is used to control the connection and disconnection of the transmission channel, ensuring that the transmission path remains unobstructed during normal operation, and at the same time ensuring that the transmission path is automatically connected and disconnected after stopping use, avoiding the energization of the wired transmission drill pipe in the non-working state and improving the safety in the explosive gas environment. Description of the Drawings

[0047] Figure 1 is the overall sectional structure schematic diagram of the sealed self-connecting and disconnecting multi-channel wired transmission drill pipe for underground directional drilling in coal mines.

[0048] Figure 2 is the overall sectional structure schematic diagram of.

[0049] Figure 3 is the sectional structure schematic diagram of the multi-channel male connection component and its installation in the drill pipe body.

[0050] Figure 4 is the sectional structure schematic diagram of the multi-channel female connection component and its installation in the drill pipe body.

[0051] Figure 5 is the sectional structure schematic diagram of the multi-channel male connector.

[0052] Figure 6 is the sectional structure schematic diagram of the multi-channel female connector.

[0053] Figure 7 is the sectional structure schematic diagram of the first inner elastic sealing plug and the second inner elastic sealing plug.

[0054] Figure 8It is a schematic cross-sectional structure diagram of the first outer elastic sealing plug and the second outer elastic sealing plug.

[0055] Figure 9 It is a schematic cross-sectional view of the transmission path cut-off of the sealed self-switching multi-channel wired transmission drill pipe for directional drilling underground in coal mines.

[0056] Figure 10 It is a schematic cross-sectional view of the transmission path connection of the sealed self-switching multi-channel wired transmission drill pipe for directional drilling underground in coal mines.

[0057] The meanings of each label in the figure are as follows: 1 - drill pipe body, 2 - male joint, 3 - rod body, 4 - female joint, 5 - multi-channel male connection component, 6 - multi-channel female connection component, 7 - wire conduit, 8 - multi-channel shielded cable, 9 - water passage;

[0058] 201 - first annular groove, 202 - second annular groove, 203 - third annular groove, 204 - male head positioning boss, 205 - first axial through hole, 206 - radial water hole,

[0059] 401 - fourth annular groove, 402 - fifth annular groove, 403 - female head positioning boss, 404 - second axial through hole;

[0060] 501 - first inner elastic sealing plug, 502 - first outer elastic sealing plug, 503 - multi-channel male connection head, 504 - first inner fixing ring, 505 - first outer fixing ring, 506 - first inner limiting ring, 507 - first outer limiting ring, 508 - inner spring, 509 - outer spring, 510 - first sealable through channel;

[0061] 50101 - outer serrated sealing mouth, 50102 - inner limiting step, 50103 - inner positioning groove;

[0062] 50201 - inner serrated sealing mouth, 50202 - outer limiting step, 50203 - outer positioning groove;

[0063] 50301 - conductive boss, 50302 - male head conductive ring, 50303 - sealing and guiding boss, 50304 - first connection port, 50305 - first annular conductor;

[0064] 601 - second inner elastic sealing plug, 602 - second outer elastic sealing plug, 603 - multi-channel female connection head, 604 - second inner fixing ring, 605 - second outer fixing ring, 606 - second inner limiting ring, 607 - second sealable through channel;

[0065] 60301 - conductive groove, 60302 - female head conductive ring, 60303 - second connection port, 60304 - limiting groove, 60305 - second annular conductor.

[0066] The following further elaborates on the specific content of the present invention in conjunction with embodiments. Specific Embodiments

[0067] It should be noted that all components and devices in the present invention, unless otherwise specified, all adopt the components and devices known in the prior art. For example, the directional drilling rig, rotary water feeder, mud pump, downhole measurement probe, and borehole explosion-proof computer all adopt known devices.

[0068] In view of the defects of the prior art recorded in the background art, through painstaking research and design, and integrating the experience and achievements of being engaged in related industries for many years, the present invention aims at the deficiencies of the existing wired transmission drill pipes for underground coal mine directional drilling, such as few signal transmission paths, high connection failure rate, and lack of safety protection for the central cable passing device. It researches and designs a sealed self-switching multi-channel wired transmission drill pipe for underground coal mine directional drilling and its usage method to overcome the above defects.

[0069] The present invention provides a sealed self-switching multi-channel wired transmission drill pipe for underground coal mine directional drilling and its usage method. The wired transmission drill pipe of the present invention includes a drill pipe body friction-welded in sequence by a male joint, a rod body, and a female joint, a multi-channel male connection assembly arranged on the male joint, a multi-channel female connection assembly arranged on the female joint, a wire passing pipe arranged inside the drill pipe body, and a multi-channel shielded cable passing through the wire passing pipe to connect the multi-channel male connection assembly and the multi-channel female connection assembly. The wired transmission drill pipe is in a sealed state initially and when connected; when high-pressure flushing fluid is provided to the borehole for directional drilling, the adjacent multi-channel male connection assembly and multi-channel female connection assembly are connected, and the transmission path is turned on to achieve efficient bidirectional signal and unidirectional electric energy transmission; after the directional drilling is completed and the supply of flushing fluid stops, the wired transmission drill pipe resumes the sealed state.

[0070] The present invention adopts technical means such as multi-channel shielded cable transmission, asynchronous connection, and normally closed sealing to achieve fast multi-channel signal transmission of the wired transmission drill pipe, automatic connection and disconnection of the transmission path, and safety protection of the transmission components in the non-working state, improving the electric energy and signal transmission capabilities, working reliability, and usage safety of the wired transmission drill pipe, and providing guarantee for downhole multi-parameter acquisition and intelligent directional drilling.

[0071] The following gives specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solution of the present application fall within the protection scope of the present invention.

[0072] Embodiment 1:

[0073] This embodiment provides a sealed self-switching multi-channel wired transmission drill pipe for underground coal mine directional drilling, as Figure 1As shown in the figure, it includes a drill pipe body 1. The hollow channel inside the drill pipe body 1 is a water passage 9. The drill pipe body 1 includes a male connector 2, a rod body 3, and a female connector 4 that are integrally and coaxially connected. It is characterized in that multiple male connection components 5 are arranged inside the male connector 2, multiple female connection components 6 are arranged inside the female connector 4, a wire threading pipe 7 is arranged inside the rod body 3, and multiple shielded cables 8 laid inside the wire threading pipe 7 connect the multiple male connection components 5 and the multiple female connection components 6.

[0074] As Figure 2 shown, the male connector 2 is provided with a first annular groove 201, a second annular groove 202, and a third annular groove 203 that are sequentially connected from the outer end to the inner end. The inner diameters of the first annular groove 201, the second annular groove 202, and the third annular groove 203 decrease in sequence; two male head positioning bosses 204 are arranged on the inner end surface of the bottom of the first annular groove 201. The bottom of the third annular groove 203 communicates with the outer end of a first axially through hole 205; a radial water hole 206 communicating with the water passage 9 is arranged on the side wall of the third annular groove 203.

[0075] As Figure 2 shown, the female connector 4 is provided with a fourth annular groove 401 and a fifth annular groove 402 that are sequentially connected from the outer end to the inner end. The inner diameters of the fourth annular groove 401 and the fifth annular groove 402 decrease; two female head positioning bosses 403 are arranged on the end surface of the bottom of the fourth annular groove 401; the bottom of the fifth annular groove 402 communicates with the outer end of a second axially through hole 404.

[0076] As Figure 3 shown, the multiple male connection components 5 include a first inner elastic seal plug 501 and a first outer elastic seal plug 502 installed in the first annular groove 201. The first inner elastic seal plug 501 is coaxially sleeved inside the first outer elastic seal plug 502 and is fixed by a first inner fixing ring 504 and a first outer fixing ring 505 connected in the first annular groove 201; a first sealable through channel 510 is formed between the first inner elastic seal plug 501 and the first outer elastic seal plug 502.

[0077] The multi-way male connection component 5 further includes a multi-way male connector 503 installed in the second annular groove 202 and is limited by a first inner limiting ring 506 and a first outer limiting ring 507 connected to the outer end inside the second annular groove 202; inner springs 508 and outer springs 509 are respectively sleeved on the inner and outer sides of the multi-way male connector 503, the outer ends of the inner springs 508 and the outer springs 509 respectively abut against the first inner limiting ring 506 and the first outer limiting ring 507, and the inner ends of the inner springs 508 and the outer springs 509 respectively abut against the sealing and guiding boss 50303 at the inner end of the multi-way male connector 503, so that the multi-way male connector 503 can perform telescopic movement in the second annular groove 202, and the outer end of the multi-way male connector 503 can extend through the first penetrable sealing channel 510 to the outer end of the first annular groove 201.

[0078] As Figure 4 shown, the multi-way female connection component 6 includes a second inner elastic sealing plug 601 and a second outer elastic sealing plug 602 installed in the fourth annular groove 401. The second inner elastic sealing plug 601 is coaxially sleeved inside the second outer elastic sealing plug 602 and is fixed by a second inner fixing ring 604 and a second outer fixing ring 605 connected in the fourth annular groove 401; a second penetrable sealing channel 607 is formed between the second inner elastic sealing plug 601 and the second outer elastic sealing plug 602.

[0079] The multi-way female connection component 6 further includes a multi-way female connector 603 installed in the fifth annular groove 402 and is limited by a second inner limiting ring 606 connected in the fifth annular groove 402.

[0080] The multi-way male connector 503 and the multi-way female connector 603 are electrically connected through a multi-way shielded cable 8.

[0081] As a preferred solution of this embodiment, as Figure 7 shown, the first inner elastic sealing plug 501 and the second inner elastic sealing plug 601 have the same structure; the first inner elastic sealing plug 501 is of an annular structure, an outer serrated sealing port 50101 is provided on the outer side wall of the first inner elastic sealing plug 501, an inner limiting step 50102 is provided at the outer end of the inner side wall of the first inner elastic sealing plug 501, the inner limiting step 50102 contacts and limits with the first inner fixing ring 504, and an inner positioning groove 50103 is provided on the inner end surface of the first inner elastic sealing plug 501. The inner positioning groove 50103 cooperates with the male head positioning boss 204 to achieve positioning.

[0082] As a preferred solution of this embodiment, as Figure 8As shown, the first outer elastic sealing plug 502 and the second outer elastic sealing plug 602 have the same structure; the first outer elastic sealing plug 502 is of an annular structure, an inner serrated sealing port 50201 is provided on the inner side wall of the first outer elastic sealing plug 502, an outer limiting step 50202 is provided at the outer end of the outside of the first outer elastic sealing plug 502, the outer limiting step 50202 is in contact limit with the first outer fixing ring 505, and an outer positioning groove 50203 is provided on the inner end face of the first outer elastic sealing plug 502, and the outer positioning groove 50203 is matched with the male head positioning boss 204 to achieve positioning.

[0083] A first penetrable sealing channel 510 is formed between the outer serrated sealing port 50101 and the inner serrated sealing port 50201.

[0084] As a preferred solution of this embodiment, as Figure 5 shown, the multi-way male connector 503 is of an integrally formed annular structure, including a first annular conductor 50305, two or more conductive bosses 50301 are provided at the outer end of the first annular conductor 50305, and male head conductive rings 50302 that are isolated from each other are provided on the inner side and the outer side of each conductive boss 50301; a sealing and guiding boss 50303 is provided at the inner end of the first annular conductor 50305, a first connection port 50304 is provided inside the sealing and guiding boss 50303, and the first connection port 50304 is electrically connected and conducted with each male head conductive ring 50302.

[0085] As a preferred solution of this embodiment, as Figure 6 shown, the multi-way female connector 603 is of an integrally formed annular structure, including a second annular conductor 60305, two or more conductive grooves 60301 are provided at the outer end of the second annular conductor 60305, and female head conductive rings 60302 that are isolated from each other are provided on the inner side and the outer side of each conductive groove 60301, a second connection port 60303 is provided at the inner end of the second annular conductor 60305, and the second connection port 60303 is electrically connected and conducted with each female head conductive ring 60302; a limiting groove 60304 is provided inside the second annular conductor 60305, and the limiting groove 60304 is in contact limit with the second inner limiting ring 606.

[0086] Further preferably, the conductive boss 50301 and the conductive groove 60301 are correspondingly inserted and matched to achieve electrical connection and conduction.

[0087] As a preferred solution of this embodiment, one end of the multi-way shielded cable 8 is electrically connected and conducted with the first connection port 50304 of the multi-way male connector 503 and is glued and sealed in the first connection port 50304; the other end of the multi-way shielded cable 8 is electrically connected and conducted with the second connection port 60303 of the multi-way female connector 603 and is glued and sealed in the second connection port 60303.

[0088] As a preferred solution of this embodiment, the outer diameters of the male connector 2 and the female connector 4 are the same as the outer diameter of the rod body 3, and the inner diameters of the male connector 2 and the female connector 4 are larger than the inner diameter of the rod body 3.

[0089] As a preferred solution of this embodiment, the wire conduit 7 is welded inside the rod body 3, and the two sections of the wire conduit 7 are respectively communicated with the inner end of the first axially through hole 205 and the inner end of the second axially through hole 404.

[0090] As a preferred solution of this embodiment, the multi-channel shielded cable 8 is laid in the channel formed by the first axially through hole 205, the wire conduit 7 and the second axially through hole 404. The middle of the multi-channel shielded cable 8 is sealed in the wire conduit 7, and there is a telescopic allowance at both ends of the multi-channel shielded cable 8.

[0091] Embodiment 2:

[0092] This embodiment provides a method for using the sealed self-switching multi-channel wired transmission drill pipe for underground directional drilling in coal mines given in Embodiment 1. This method includes the following steps:

[0093] Step 1, initial sealing state:

[0094] As Figure 9 shown, under the action of the inner spring 508 and the outer spring 509, all the multi-channel male connectors 503 are located in the second annular groove 202. The first penetrable sealing channel 510 between the first inner elastic sealing plug 501 and the first outer elastic sealing plug 502 is closed to provide sealing protection for the multi-channel male connectors 503; the multi-channel female connectors 603 have always been located in the fifth annular groove 402, and the second penetrable sealing channel 607 between the second inner elastic sealing plug 601 and the second outer elastic sealing plug 602 is closed to provide sealing protection for the multi-channel female connectors 603.

[0095] Step 2, connection of the wired transmission drill pipe:

[0096] During directional drilling, when it is necessary to add a wired transmission drill pipe, connect the male connector 2 of the drill pipe body 1 to the female connector 4 of the drill pipe body 1 on the directional drilling rig, and then connect the supporting rotary water feeder. During and after the connection process, the wired transmission drill pipe always maintains the initial sealing state.

[0097] Step 3, connection of the transmission path:

[0098] As Figure 10As shown in the figure, turn on the mud pump and supply high-pressure flushing fluid to the directional borehole through the rotating water feeder. After the flushing fluid enters the drill pipe body 1, it enters the third annular groove 203 along the radial water holes 206 and the first axial through hole 205, pushing the multi-way male connector 503 to move, compressing the inner spring 508 and the outer spring 509, so that the multi-way male connector 503 passes through the first sealable passage 510 between the first inner elastic seal plug 501 and the first outer elastic seal plug 502 and squeezes into the second sealable passage 607 between the second inner elastic seal plug 601 and the second outer elastic seal plug 602 until the male head conductive ring 50302 of the multi-way male connector 503 is completely connected to the female head conductive ring 60302 of the multi-way female connector 603; the wired transmission drill pipe connects the downhole measurement probe and the surface explosion-proof computer.

[0099] Step Four, measurement-while-drilling directional drilling:

[0100] Start the directional drilling rig for directional drilling. During the directional drilling process, send the control instructions of the surface explosion-proof computer to the downhole measurement probe through the wired transmission drill pipe and supply power to the downhole measurement probe; the downhole measurement probe works according to the control instructions of the surface explosion-proof computer and uploads the measured downhole information to the surface explosion-proof computer in real time through the wired transmission drill pipe, which is processed and displayed by the explosion-proof computer to provide a decision-making basis for the driller.

[0101] Step Five, cutting off the transmission path:

[0102] After the construction of a single drill pipe is completed, turn off the mud pump. The multi-way male connector 503 resets under the action of the inner spring 508 and the outer spring 509. The first inner elastic seal plug 501 and the first outer elastic seal plug 502 are tightly attached to seal the first sealable passage 510, and the second inner elastic seal plug 601 and the second outer elastic seal plug 602 are tightly attached to seal the second sealable passage 607.

[0103] Step Six, withdrawing the drill pipe and sealing the hole:

[0104] Repeat Steps Two to Five for directional borehole construction until the designed depth is reached. Withdraw the wired transmission drill pipe in the hole and connect the surface pipeline to seal the hole.

Claims

1. A sealed self - switching multi - path wired transmission drill pipe for underground directional drilling in coal mines, comprising a drill pipe body (1). The hollow channel inside the drill pipe body (1) is a water - passing channel (9). The drill pipe body (1) includes a male connector (2), a rod body (3), and a female connector (4) that are integrally and coaxially connected. It is characterized in that, The male connector (2) is provided with multiple male connection components (5), the female connector (4) is provided with multiple female connection components (6), and the rod body (3) is provided with a wire conduit (7). Multiple shielded cables (8) laid in the wire conduit (7) connect the multiple male connection components (5) and the multiple female connection components (6); The male connector (2) is provided with a first annular groove (201), a second annular groove (202), and a third annular groove (203) that are sequentially communicated from the outer end to the inner end. The inner diameters of the first annular groove (201), the second annular groove (202), and the third annular groove (203) decrease in sequence. Two male head positioning bosses (204) are arranged on the inner end surface of the bottom of the first annular groove (201). The bottom of the third annular groove (203) is communicated with the outer end of a first axially through hole (205). A radial water passing hole (206) communicated with the water passing channel (9) is arranged on the side wall of the third annular groove (203); The female connector (4) is provided with a fourth annular groove (401) and a fifth annular groove (402) that are sequentially communicated from the outer end to the inner end. The inner diameters of the fourth annular groove (401) and the fifth annular groove (402) decrease. Two female head positioning bosses (403) are arranged on the end surface of the bottom of the fourth annular groove (401). The bottom of the fifth annular groove (402) is communicated with the outer end of a second axially through hole (404); The multiple male connection components (5) include a first inner elastic sealing plug (501) and a first outer elastic sealing plug (502) installed in the first annular groove (201). The first inner elastic sealing plug (501) is coaxially sleeved in the first outer elastic sealing plug (502) and fixed by a first inner fixing ring (504) and a first outer fixing ring (505) connected in the first annular groove (201). A first penetrable sealing channel (510) is formed between the first inner elastic sealing plug (501) and the first outer elastic sealing plug (502); The multiple male connection components (5) further include multiple male connectors (503) installed in the second annular groove (202) and limited by a first inner limiting ring (506) and a first outer limiting ring (507) connected to the outer end of the inner part of the second annular groove (202). Inner springs (508) and outer springs (509) are respectively sleeved on the inner and outer sides of the multiple male connectors (503). The outer ends of the inner springs (508) and the outer springs (509) respectively abut against the first inner limiting ring (506) and the first outer limiting ring (507), and the inner ends of the inner springs (508) and the outer springs (509) respectively abut against the sealing and guiding bosses (50303) at the inner ends of the multiple male connectors (503), so that the multiple male connectors (503) can move telescopically in the second annular groove (202), and the outer ends of the multiple male connectors (503) can pass through the first penetrable sealing channel (510) and extend to the outer end of the first annular groove (201); The multi-way female connection component (6) described above includes a second inner elastic sealing plug (601) and a second outer elastic sealing plug (602) installed in the fourth annular groove (401). The second inner elastic sealing plug (601) is coaxially sleeved inside the second outer elastic sealing plug (602) and is fixed by a second inner fixing ring (604) and a second outer fixing ring (605) connected in the fourth annular groove (401); a second penetrable sealing channel (607) is formed between the second inner elastic sealing plug (601) and the second outer elastic sealing plug (602); The multi-way female connection component (6) also includes a multi-way female connector (603) installed in the fifth annular groove (402) and is limited by a second inner limiting ring (606) connected in the fifth annular groove (402); The multi-way male connector (503) and the multi-way female connector (603) are electrically connected through a multi-way shielded cable (8).

2. The sealed self - on - off multi - path wired transmission drill pipe for underground directional drilling in coal mines according to claim 1, characterized in that, The first inner elastic sealing plug (501) and the second inner elastic sealing plug (601) have the same structure; the first inner elastic sealing plug (501) is of an annular structure. An outer serrated sealing port (50101) is provided on the outer side wall of the first inner elastic sealing plug (501). An inner limiting step (50102) is provided at the outer end on the inner side wall of the first inner elastic sealing plug (501). The inner limiting step (50102) contacts and limits with the first inner fixing ring (504). An inner positioning groove (50103) is provided on the inner end face of the first inner elastic sealing plug (501). The inner positioning groove (50103) cooperates with the male head positioning boss (204) to achieve positioning.

3. The sealed self - switching multi - path wired transmission drill pipe for underground directional drilling in coal mines according to claim 2, wherein, The first outer elastic sealing plug (502) and the second outer elastic sealing plug (602) have the same structure; the first outer elastic sealing plug (502) is of an annular structure. An inner serrated sealing port (50201) is provided on the inner side wall of the first outer elastic sealing plug (502). An outer limiting step (50202) is provided at the outer end on the outer side of the first outer elastic sealing plug (502). The outer limiting step (50202) contacts and limits with the first outer fixing ring (505). An outer positioning groove (50203) is provided on the inner end face of the first outer elastic sealing plug (502). The outer positioning groove (50203) cooperates with the male head positioning boss (204) to achieve positioning; A first penetrable sealing channel (510) is formed between the outer serrated sealing port (50101) and the inner serrated sealing port (50201).

4. The sealed self - on - off multi - path wired transmission drill pipe for underground directional drilling in coal mines according to claim 1, wherein, The multi-way male connector (503) is an integrally formed annular structure, comprising a first annular conductor (50305), wherein the outer end of the first annular conductor (50305) is provided with two or more conductive bosses (50301), and the inner and outer sides of each conductive boss (50301) are provided with male conductive rings (50302) isolated from each other; the inner end of the first annular conductor (50305) is provided with a sealing guide boss (50303), and the sealing guide boss (50303) is provided with a first connection port (50304), and the first connection port (50304) is electrically connected to each male conductive ring (50302).

5. The sealed self - on - off multi - path wired transmission drill pipe for underground directional drilling in coal mines according to claim 4, characterized in that, The multi-way female connector (603) is an integrally formed annular structure, comprising a second annular conductor (60305), the outer end of the second annular conductor (60305) being provided with two or more conductive grooves (60301), the inner and outer sides of each conductive groove (60301) being provided with mutually isolated female conductive rings (60302), the inner end of the second annular conductor (60305) being provided with a second connection port (60303), the second connection port (60303) being electrically connected and conducted with each female conductive ring (60302); a limiting groove (60304) being provided inside the second annular conductor (60305), the limiting groove (60304) being in contact with a second inner limiting ring (606) for limiting; The conductive boss (50301) and the conductive groove (60301) are plugged in and correspondingly connected to achieve electrical connection.

6. The sealed self - on - off multi - path wired transmission drill pipe for underground directional drilling in coal mines according to claim 5, characterized in that, One end of the multi-channel shielded cable (8) is electrically connected to the first connection port (50304) of the multi-channel male connector (503) and is glued and sealed in the first connection port (50304); the other end of the multi-channel shielded cable (8) is electrically connected to the second connection port (60303) of the multi-channel female connector (603) and is glued and sealed in the second connection port (60303).

7. The sealed self - on - off multi - path wired transmission drill pipe for underground directional drilling in coal mines according to claim 1, wherein, The threading tube (7) is welded inside the rod body (3), and two sections of the threading tube (7) are respectively connected to the inner end of the first axial through hole (205) and the inner end of the second axial through hole (404).

8. The sealed self - switching multi - path wired transmission drill pipe for underground directional drilling in coal mines according to claim 1, characterized in that, The multi-channel shielded cable (8) is laid in a channel formed by the first axial through hole (205), the threading tube (7) and the second axial through hole (404); the middle of the multi-channel shielded cable (8) is sealed in the threading tube (7); and expansion margins are left at both ends of the multi-channel shielded cable (8).

9. A method for using a sealed self - switching multi - path wired transmission drill pipe for underground directional drilling in coal mines according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: Step 1, initial sealing state: Under the action of the inner spring (508) and the outer spring (509), the multi-way male connector (503) is completely located in the second annular groove (202), and the first penetrable sealing channel (510) between the first inner elastic sealing plug (501) and the first outer elastic sealing plug (502) is closed, thereby sealing and protecting the multi-way male connector (503); the multi-way female connector (603) is always located in the fifth annular groove (402), and the second penetrable sealing channel (607) between the second inner elastic sealing plug (601) and the second outer elastic sealing plug (602) is closed, thereby sealing and protecting the multi-way female connector (603); Step 2: Wired transmission drill pipe connection: During directional drilling, when it is necessary to add a wired transmission drill rod, the male connector (2) of the drill rod body (1) is connected to the female connector (4) of the drill rod body (1) on the directional drilling machine, and then the matching rotary water feeder is connected; during and after the connection, the wired transmission drill rod always maintains the initial sealing state; Step 3: Transmission channel connected: The mud pump is turned on to supply high-pressure flushing fluid to the directional drilling hole through the rotating water feeder. After the flushing fluid enters the drill pipe body (1), it enters the third annular groove (203) along the radial water hole (206) and the first axial through hole (205), pushes the multi-way male connector (503) to move, compresses the inner spring (508) and the outer spring (509), and makes the multi-way male connector (503) pass through the first penetrable sealing channel (510) between the first inner elastic sealing plug (501) and the first outer elastic sealing plug (502), squeezes into the second penetrable sealing channel (607) between the second inner elastic sealing plug (601) and the second outer elastic sealing plug (602), until the male conductive ring (50302) of the multi-way male connector (503) and the female conductive ring (60302) of the multi-way female connector (603) are fully connected; the wired transmission drill pipe connects the bottom hole measurement probe and the hole mouth explosion-proof computer; Step 4: Directional drilling with measurement while drilling: Start the directional drilling rig to carry out directional drilling. During the directional drilling process, the control instructions of the hole mouth explosion-proof computer are sent to the hole bottom measurement probe through the wired transmission drill pipe, and the hole bottom measurement probe is powered; the hole bottom measurement probe works according to the control instructions of the hole mouth explosion-proof computer, and the measured hole bottom information is uploaded to the hole mouth explosion-proof computer in real time through the wired transmission drill pipe, and the explosion-proof computer processes and displays it, providing a decision-making basis for the driller; Step 5: Cut off the transmission path: After the construction of a single drill pipe is completed, the mud pump is turned off, the multi-way male connector (503) is reset under the action of the inner spring (508) and the outer spring (509), the first inner elastic sealing plug (501) and the first outer elastic sealing plug (502) are tightly attached to each other, so that the first penetrable sealing channel (510) is sealed, and the second inner elastic sealing plug (601) and the second outer elastic sealing plug (602) are tightly attached to each other, so that the second penetrable sealing channel (607) is sealed; Step 6: Back off the drill and seal the hole: Repeat steps two to five for directional drilling construction until the design depth is reached, withdraw the wireline drill pipe from the hole, and connect the hole mouth pipeline for hole sealing.

Images