A wired drill pipe for measurement while drilling with a non-co-rotation, non-contact signal transmission structure and its working method

Abstract

This invention relates to a wired drill pipe with a non-co-rotation, non-contact signal transmission structure for measurement while drilling (MSD) and its working method, belonging to the field of coal mine drilling and MMD technology. The wired drill pipe includes a hollow rod body, a rubber sleeve, wires, a tail rod, and a wireless transmission module. The rubber sleeve is housed within the hollow rod body, and several wires for signal transmission are housed within the rubber sleeve. Each wire has a plug and an interface at both ends, and the wires are connected via the plug and corresponding interface. Several hollow rod bodies are connected by threads. The first hollow rod body is connected to a drill bit, and the last hollow rod body is connected to a tail rod, which houses the wireless transmission module. This invention solves the problems of transmission failure and signal attenuation in complex downhole conditions using traditional single transmission methods, achieving real-time, accurate, and stable acquisition and transmission of drilling parameters. The wired drill pipe enables rapid connection and disconnection of the drill pipe, reducing the labor intensity of operators.

Description

Technical Field

[0001] This invention relates to a wired drill pipe with a non-co-rotation, non-contact signal transmission structure for measurement while drilling and its working method, belonging to the field of coal mine drilling and measurement while drilling technology. Background Technology

[0002] Rockburst is a major dynamic disaster in deep coal mining. Drilling pressure relief is the core technology for preventing rockburst. Real-time measurement of parameters such as drilling pressure, rotation speed, borehole trajectory, and surrounding rock stress during drilling is crucial to ensuring the effectiveness of borehole pressure relief. As a core technology in borehole construction, the stability and real-time performance of data transmission of measurement-while-drilling technology directly determine the measurement accuracy.

[0003] The existing transmission methods of the measurement while drilling system for underground anti-impact drilling rigs in coal mines are mainly divided into two types: wired transmission and wireless transmission. Wired transmission has a high transmission rate and strong anti-interference ability, but the drill rod is in a rotating state during drilling, which can easily lead to line wear, poor contact or even breakage, resulting in transmission failure. It can also easily cause the electronic components of the data processing box to loosen, resulting in data distortion. Radio electromagnetic wave transmission can realize non-contact communication, but it is affected by the absorption and scattering of the underground coal and rock medium, resulting in severe signal attenuation and poor long-distance transmission performance. Moreover, the high humidity, high dust and strong electromagnetic interference environment underground further reduces the transmission stability.

[0004] In addition, existing drill pipe splicing structures mostly only consider mechanical connections and do not provide special protection for wired transmission interfaces. After splicing, problems such as loose interfaces and mud and water seepage leading to short circuits are prone to occur. The non-co-rotational contact transmission structure between the rotating drill pipe and the fixed tailpipe will wear down after use, causing data transmission to fail to meet the requirements of real-time stable transmission for drilling measurements.

[0005] Therefore, there is an urgent need to design a drilling measurement system that balances the reliability of long-distance transmission with the stability of transmission between rotating and stationary components, in order to overcome the shortcomings of existing technologies. Summary of the Invention

[0006] To address the technical problems of unstable data processing, high labor intensity of manual wiring, and easy wear and tear of transmission structures in existing measurement-while-drilling (MSW) technologies, this invention provides a wired drill pipe with a non-co-rotation, non-contact signal transmission structure for MSW and its working method. It integrates long-distance wired transmission and short-distance non-co-rotation, non-contact electromagnetic wave transmission technologies, solving the problems of transmission failure and signal attenuation in complex downhole conditions under traditional single transmission methods. This enables real-time, accurate, and stable acquisition and transmission of drilling parameters. The wired drill pipe allows for quick connection and disconnection of the drill pipe, reducing the labor intensity of operators.

[0007] The technical solution of the present invention is as follows: A wired drill pipe for measurement while drilling with a non-co-rotation, non-contact signal transmission structure includes a hollow rod body, a rubber sleeve, a wire, a tail rod, and a wireless transmission module, wherein: The hollow rod body contains a rubber sleeve, and inside the rubber sleeve are several wires for transmitting signals. The two ends of the wires are respectively equipped with plugs and interfaces. The wires are connected through the plugs and corresponding interfaces. Several hollow rods are connected by threads. The first hollow rod is connected to a drill bit, and the last hollow rod is connected to a tail rod. The tail rod contains a wireless transmission module.

[0008] According to a preferred embodiment of the present invention, an inserting mechanism is provided at one end of the rubber sleeve plug, and a trapezoidal slot is provided at one end of the rubber sleeve interface, with the interface disposed within the trapezoidal slot. The embedded mechanism includes a rubber rod, a fixed rubber frustum, and a movable rubber frustum. The rubber rod is threaded to a rubber sleeve. A wire is fitted inside the rubber rod, and a plug is provided at one end of the wire extending out of the rubber rod. The fixed rubber frustum and the movable rubber frustum are provided on the rubber rod. The fixed rubber frustum is fixedly set at the outer end of the rubber rod, and the rubber rod and the fixed rubber frustum are integrally formed. The movable rubber frustum is movably fitted on the rubber rod.

[0009] The plastic fixing frustum and trapezoidal slot are colored accordingly during manufacturing to distinguish the connections of different sensor wires and avoid data transmission path errors.

[0010] According to a further preferred embodiment of the present invention, a cavity is provided inside the rubber sleeve on the inner side of the trapezoidal slot, and a fixing block is provided inside the cavity by means of a spring. The fixing block is provided with an interface, and a wire passing through the spring is connected to the interface. The fixing block is connected to the cavity by the spring, providing space for the wired drill rod to be disassembled later. The trapezoidal slot is formed on the rubber sleeve and is integrally formed with the rubber sleeve.

[0011] According to a preferred embodiment of the present invention, the outer diameter of the rubber sleeve is 1-2 mm smaller than the inner diameter of the hollow rod, so that the rubber sleeve does not completely fit the rod wall after being inserted into the hollow rod, providing a certain amount of space for easy insertion and removal.

[0012] According to a preferred embodiment of the present invention, the wireless transmission module includes a signal receiving enameled coil and a signal transmitting enameled coil. The signal receiving enameled coil is provided on the tail rod, and an insulating coating is applied between the tail rod tube wall and the signal receiving enameled coil to prevent the rod body from affecting the transmission of electromagnetic wave signals. A corresponding signal transmitting enameled coil is provided on the hollow rod body at the end. The signal transmitting enameled coil is connected to a wire, and the signal transmitting enameled coil and the wire are connected to receive sensor electrical signals and convert them into electromagnetic wave signals. The signal receiving enameled coil is connected to a control system, and the control system performs data processing and display.

[0013] Taking four sets of signal transmitting and receiving enameled coils as an example, each set of signal transmission structures must maintain a certain distance to prevent signal distortion caused by mutual interference between the enameled coils.

[0014] According to a preferred embodiment of the present invention, the hollow end rod and the tail rod are connected by a bearing to achieve a non-co-rotation effect, thereby avoiding the problems of electronic component instability and signal processing distortion caused by high-speed co-rotation.

[0015] According to a preferred embodiment of the present invention, the trapezoidal groove in the hollow rod body at the end is provided with an integrally formed extension retaining ring, which extends radially inward to the length of the bearing wall thickness, to waterproof the bearing and prevent the bearing from corroding and losing its working ability due to prolonged contact with water.

[0016] The wires inside the hollow rod at the end and the hollow rod at the beginning need to be adjusted in terms of plug and interface to match the signal transmitting enameled coil and sensor, so as to meet normal connection requirements.

[0017] According to a preferred embodiment of the present invention, a liquid supply end cap is threadedly connected to the end of the tail rod, and the liquid supply end cap is connected to a drilling flushing system through a pipe for delivering liquid to the drill bit to achieve drilling cooling and slag removal.

[0018] The working method of the wired drill pipe for drilling measurement with the above-mentioned non-co-rotation, non-contact signal transmission structure is as follows: (1) Insert the rubber sleeve into each hollow rod in sequence, thread the drill bit into the first hollow rod, and connect the wire to the sensor inside the drill bit; (2) Install the remaining hollow rods in sequence; (3) Install a tail rod on the hollow rod body at the tail end, and connect the end of the tail rod to the drilling flushing system.

[0019] According to a further preferred embodiment of the present invention, in step (2), the hollow rod connection process is as follows: When connecting two hollow rods, first perform threaded connection, then apply an axial force to the rubber sleeve, causing its fixed cylindrical body to contact the trapezoidal groove and enter the cavity. The plug carried by the fixed cylindrical body connects to the interface of the rubber sleeve inside the other hollow rod. At the same time, during the extrusion process, a part of the movable cylindrical body will contact the trapezoidal groove, opening the trapezoidal groove and causing it to rotate to both sides at a certain angle before contacting the rod wall of the hollow rod, thereby fixing the relative position of the rubber sleeve and the hollow rod, so that the rubber sleeve can rotate stably and at high speed with the hollow rod. When it is necessary to disassemble the hollow rod, external force is applied axially to press the rubber sleeve again. The pressure is transmitted to the movable rubber frustum, causing it to fully enter the cavity behind the trapezoidal slot. This releases the compression and fixation between the rubber sleeve and the hollow rod. Then, axial tension is applied. During the pulling process, the movable rubber frustum and the fixed rubber frustum are held together by the spring and the trapezoidal slot, and together they disengage from the trapezoidal slot, achieving the separation of adjacent rubber sleeves. At the same time, the plug and interface are disengaged, completing the rapid separation of the wiring without the need for additional wiring disassembly, greatly reducing the labor intensity of downhole operations.

[0020] The beneficial effects of this invention are as follows: 1. This invention integrates a rubber sleeve, plug, and interface mating structure on the wired drill pipe, replacing the traditional manual section-by-section wiring method. When adjacent hollow rods are spliced, the wires can be quickly and accurately connected. During disassembly, the rubber sleeve can be separated from the connection end by axial force, without the need for additional disassembly of the wiring. This effectively simplifies the drill pipe splicing and disassembly process, significantly reduces the wiring labor intensity of downhole workers, and improves the overall efficiency of drilling operations. 2. The rubber sleeve of the present invention can not only avoid the damage to the line caused by long-term friction between the line and the rod wall, but also effectively isolate the long-term corrosion of the line and the joint connection by the drilling fluid, realizing the dual protection and waterproofing of the line and the joint; at the same time, the cooperation structure of the fixed and movable truncated cones of the rubber can form a sealing effect when the drill rod rotates, preventing short circuits caused by mud and water seepage, and greatly improving the service life and working stability of the wired transmission line under the conditions of high humidity, high dust and multi-media corrosion in the well.

[0021] 3. This invention constructs a non-co-rotating, non-contact electromagnetic wave signal transmission structure by cooperating the signal transmitting enameled coil of the hollow end rod and the signal receiving enameled coil of the tail rod, combined with the bearing to achieve a non-co-rotating effect between the hollow rod and the tail rod. This completely avoids the wear problem caused by mechanical contact in traditional non-co-rotating contact transmission structures, eliminating the risk of signal transmission interruption and distortion caused by wear at the source. Furthermore, the insulating coating between the coils effectively prevents the rod from interfering with the electromagnetic wave signal, further ensuring the accuracy of signal transmission.

[0022] 4. In this invention, the tail rod and the hollow rod body of the last section achieve non-co-rotation through bearings, so that the control system is separated from the high-speed rotation state of the drill pipe. This effectively solves the problems of unstable electronic component connection and data processing distortion caused by the high-speed co-rotation of the data processing box and the drill pipe in traditional drilling measurement, and ensures that the drilling torque, pressure and other parameters collected by the sensor can truly reflect the downhole drilling conditions after processing.

[0023] 5. The wired drill rod and non-co-rotation, non-contact signal transmission structure of the present invention can be directly adapted to existing coal mine underground anti-impact drilling rigs. The rubber sleeve and rod wall have reserved space, which facilitates on-site installation, disassembly and maintenance. The tail rod angle can be flexibly adjusted to adapt to different drilling conditions. There is no need to make major modifications to the existing drilling equipment, the modification cost is low, and it is easy to promote and apply in the underground field.

[0024] 6. This invention combines the advantages of long-distance wired transmission, such as high anti-interference and high transmission rate, with the advantages of non-contact electromagnetic wave transmission, such as wear-free transmission and adaptability to rotating working conditions. Ultimately, it achieves wireless transmission of data to the receiving and display device, thus constructing a stable data transmission system across the entire link. Under complex electromagnetic environments and construction conditions downhole, it can realize real-time and accurate acquisition and transmission of drilling parameters, providing reliable data for optimizing the borehole pressure relief process for rockburst prevention. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the hollow rod structure at the first end of the present invention; Figure 2 This is a schematic diagram of the cross-section of the hollow rod of the present invention; Figure 3 For the present invention Figure 2 A cross-sectional view along the AA direction; Figure 4 This is a schematic diagram of the connection between adjacent hollow rods in this invention; Figure 5 This is a schematic diagram of the tail boom structure of the present invention; In the diagram: 1. Drill bit; 2. Rubber sleeve; 3. Wire; 4. Tail rod; 5. Plug; 6. Interface; 7. Thread; 8. Hollow rod at the beginning; 9. Hollow rod at the end; 10. Trapezoidal groove; 11. Rubber rod; 12. Rubber fixed truncated cone; 13. Rubber movable truncated cone; 14. Cavity; 15. Fixing block; 16. Signal receiving enameled coil; 17. Signal transmitting enameled coil; 18. Control system; 19. Bearing; 20. Extension retaining ring; 21. Liquid supply end cap; 22. Drilling flushing system; 23. Embedding mechanism; 24. Sensor; 25. Spring. Detailed Implementation

[0026] The present invention will be further described below with reference to the embodiments and accompanying drawings, but is not limited thereto.

[0027] Example 1: like Figure 1-5 As shown, this embodiment provides a wired drill pipe for measurement while drilling with a non-co-rotation, non-contact signal transmission structure, including a hollow rod body, a rubber sleeve 2, a wire 3, a tail rod 4, and a wireless transmission module, wherein: A rubber sleeve 2 is installed inside the hollow rod body. Several wires 3 for transmitting signals are installed inside the rubber sleeve 2. Plugs 5 and interfaces 6 are respectively installed at both ends of the wires 3. Several wires 3 are connected through plugs 5 and corresponding interfaces 6. Several hollow rod bodies are connected by threads. A drill bit 1 is connected to the first hollow rod body 8. A tail rod 4 is connected to the last hollow rod body 9. A wireless transmission module is installed inside the tail rod 4.

[0028] The end of the rubber sleeve 2 where the plug is located is provided with an embedding mechanism 23, and the end of the rubber sleeve interface is provided with a trapezoidal slot 10, and the interface 6 is located in the trapezoidal slot 10. The embedding mechanism 23 includes a plastic rod 11, a plastic fixed truncated cone 12, and a plastic movable truncated cone 13. The plastic rod 11 is connected to the plastic sleeve 2 by a thread. A wire 3 is installed inside the plastic rod 11. A plug 5 is provided at one end of the wire 3 extending out of the plastic rod 11. The plastic fixed truncated cone 12 and the plastic movable truncated cone 13 are provided on the plastic rod 11. The plastic fixed truncated cone 12 is fixedly installed at the outer end of the plastic rod 11. The plastic rod and the plastic fixed truncated cone are integrally formed. The plastic movable truncated cone 13 is movably installed on the plastic rod 11.

[0029] The plastic fixing frustum and trapezoidal slot are colored accordingly during manufacturing to distinguish the connections of different sensor wires and avoid data transmission path errors.

[0030] A cavity 14 is provided inside the rubber sleeve 2 on the inner side of the trapezoidal slot 10. A fixing block 15 is provided inside the cavity 14 via a spring 25. An interface 6 is provided on the fixing block 15. A wire 3 passing through the spring is connected to the interface 6. The fixing block is connected to the cavity via the spring, providing space for the wired drill rod to be disassembled later. The trapezoidal slot is formed on the rubber sleeve and is integrally molded with the rubber sleeve.

[0031] The outer diameter of the rubber sleeve 2 is 1-2mm smaller than the inner diameter of the hollow rod, so that the rubber sleeve does not completely fit the rod wall after being inserted into the hollow rod, leaving a certain amount of space to facilitate insertion and removal.

[0032] The wireless transmission module includes a signal receiving enameled coil 16 and a signal transmitting enameled coil 17. The signal receiving enameled coil 16 is installed on the tail rod 4. An insulating coating is applied between the tail rod tube wall and the signal receiving enameled coil to prevent the rod body from affecting the transmission of electromagnetic wave signals. A corresponding signal transmitting enameled coil 17 is installed on the hollow end rod 9. The signal transmitting enameled coil 17 is connected to a wire 3. The signal transmitting enameled coil and the wire are connected to receive the sensor electrical signal and convert it into an electromagnetic wave signal. The signal receiving enameled coil 16 is connected to a control system 18, which performs data processing and display.

[0033] Taking four sets of signal transmitting and receiving enameled coils as an example, each set of signal transmission structures must maintain a certain distance to prevent signal distortion caused by mutual interference between the enameled coils.

[0034] The hollow end rod 9 and the tail rod 4 are connected by a bearing 19 to achieve a non-co-rotation effect, avoiding the problems of electronic component instability and signal processing distortion caused by high-speed co-rotation.

[0035] The trapezoidal groove 10 inside the hollow rod body 9 at the end is provided with an integrally formed extension retaining ring 20, which extends the bearing wall thickness radially inward to waterproof the bearing and prevent the bearing from corroding and losing its working ability due to prolonged contact with water.

[0036] The wires inside the hollow rod at the end and the hollow rod at the beginning need to be adjusted in terms of plug and interface to match the signal transmitting enameled coil and sensor, so as to meet normal connection requirements.

[0037] The tail rod 4 is threaded to a liquid supply end cap 21, which is connected to a drilling flushing system 22 via a pipe. This system is used to deliver liquid to the drill bit to cool the borehole and remove slag.

[0038] The working method of the wired drill pipe for drilling measurement with the above-mentioned non-co-rotation, non-contact signal transmission structure is as follows: (1) Insert the rubber sleeve 2 into each hollow rod body in sequence, thread the drill bit to the first hollow rod body 8, and connect the wire to the sensor inside the drill bit; (2) Install the remaining hollow rods in sequence; (3) Install a tail rod on the hollow rod body at the tail end, and connect the end of the tail rod to the drilling flushing system.

[0039] In step (2), the hollow rod connection process is as follows: When connecting two hollow rods, first perform threaded connection, then apply an axial force to the rubber sleeve 2, causing its rubber fixed frustum 12 to contact the trapezoidal groove and enter the cavity 14. The plug 5 carried by the rubber fixed frustum 12 connects to the interface 6 of the rubber sleeve inside the other hollow rod. At the same time, during the extrusion process, a part of the rubber movable frustum 13 will contact the trapezoidal groove 10, opening the trapezoidal groove 10 and causing the trapezoidal groove 10 to rotate to both sides at a certain angle and contact the rod wall of the hollow rod, thereby fixing the relative position of the rubber sleeve 2 and the hollow rod, so that the rubber sleeve 2 rotates stably and at high speed with the hollow rod. When it is necessary to disassemble the hollow rod, external force is used again to axially press the rubber sleeve. The pressure is transmitted to the movable rubber frustum 13, so that it is completely inserted into the cavity 14 after the trapezoidal slot. This releases the squeezing and fixing state between the rubber sleeve 2 and the hollow rod. Then, axial tension is applied. During the pulling process, the movable rubber frustum 13 and the fixed rubber frustum 12 are stuck together under the limit of the spring and the trapezoidal slot, and they jointly disengage from the trapezoidal slot 10, realizing the separation of adjacent rubber sleeves. At the same time, the plug 5 is disengaged from the interface 6, completing the rapid separation of the circuit without the need for additional disassembly of the circuit, which greatly reduces the labor intensity of downhole operations.

Claims

1. A wired drill pipe for measurement while drilling with a non-co-rotating non-contact signal transmission structure, characterized in that, It includes a hollow pole, a rubber sleeve, wires, a tail pole, and a wireless transmission module, among which: The hollow rod body contains a rubber sleeve, and inside the rubber sleeve are several wires for transmitting signals. The two ends of the wires are respectively equipped with plugs and interfaces. The wires are connected through the plugs and corresponding interfaces. Several hollow rods are connected by threads. The first hollow rod is connected to a drill bit, and the last hollow rod is connected to a tail rod. The tail rod contains a wireless transmission module.

2. The wireline drillpipe with non-co-rotating non-contact signal transmission structure for measurement while drilling of claim 1, wherein, An inserting mechanism is provided at one end of the rubber sleeve plug, and a trapezoidal slot is provided at the other end of the rubber sleeve interface, with the interface set inside the trapezoidal slot. The embedding mechanism includes a rubber rod, a fixed rubber frustum, and a movable rubber frustum. The rubber rod is threaded to a rubber sleeve. A wire is fitted inside the rubber rod, and a plug is provided at one end of the wire extending out of the rubber rod. The fixed rubber frustum and the movable rubber frustum are provided on the rubber rod. The fixed rubber frustum is fixedly set at the outer end of the rubber rod, and the movable rubber frustum is movably fitted on the rubber rod.

3. The wire-line drill pipe with non-co-rotating non-contact signal transmission structure for measurement while drilling according to claim 2, wherein, The inner side of the trapezoidal slot has a cavity in the rubber sleeve. A fixing block is installed in the cavity through a spring. The fixing block has an interface, and a wire passing through the spring is connected to the interface.

4. The wire-line drill pipe with non-co-rotating non-contact signal transmission structure for measurement while drilling as claimed in claim 3, wherein, The outer diameter of the rubber sleeve is smaller than the inner diameter of the hollow rod.

5. The wire-line drill pipe with non-co-rotating non-contact signal transmission structure for measurement while drilling according to claim 4, characterized in that, The wireless transmission module includes a signal receiving enameled coil and a signal transmitting enameled coil. The signal receiving enameled coil is installed on the tail rod, and the corresponding signal transmitting enameled coil is installed on the hollow end rod. The signal transmitting enameled coil is connected to a wire, and the signal receiving enameled coil is connected to a control system.

6. The wire-line drill pipe with non-co-rotating non-contact signal transmission structure for measurement while drilling of claim 5, wherein, The hollow end rod is connected to the tail rod via a bearing to achieve a non-co-rotation effect.

7. The wired drill pipe for drilling measurement with a non-co-rotation, non-contact signal transmission structure as described in claim 6, characterized in that, The trapezoidal groove inside the hollow rod at the end is equipped with an integrally formed extension retaining ring that extends radially inward to the length of the bearing wall thickness.

8. The wired drill pipe for measurement while drilling with a non-co-rotation, non-contact signal transmission structure as described in claim 7, characterized in that, The tail rod end is threadedly connected to a liquid supply end cap, which is connected to a drilling flushing system via a pipe.

9. The working method of the wired drill pipe for drilling measurement with a non-co-rotation, non-contact signal transmission structure as described in claim 8, characterized in that, The steps are as follows: (1) Insert the rubber sleeve into each hollow rod in sequence, thread the drill bit into the first hollow rod, and connect the wire to the sensor inside the drill bit; (2) Install the remaining hollow rods in sequence; (3) Install a tail rod on the hollow rod body at the tail end, and connect the end of the tail rod to the drilling flushing system.

10. The working method of the wired drill pipe for drilling measurement with a non-co-rotation, non-contact signal transmission structure as described in claim 9, characterized in that, In step (2), the hollow rod connection process is as follows: When connecting two hollow rods, first perform threaded connection, then apply an axial force to the rubber sleeve, causing its fixed cylindrical body to contact the trapezoidal groove and enter the cavity. The plug carried by the fixed cylindrical body connects to the interface of the rubber sleeve inside the other hollow rod. At the same time, during the extrusion process, a part of the movable cylindrical body will contact the trapezoidal groove, opening the trapezoidal groove and causing it to rotate to both sides at a certain angle before contacting the rod wall of the hollow rod, thereby fixing the relative position of the rubber sleeve and the hollow rod, so that the rubber sleeve can rotate stably and at high speed with the hollow rod. When the hollow rod needs to be disassembled, external force is applied axially to press the rubber sleeve again. The pressure is transmitted to the movable rubber frustum, causing it to fully enter the cavity behind the trapezoidal slot. This releases the squeezing and fixing state between the rubber sleeve and the hollow rod. Then, axial tension is applied. During the pulling process, the movable rubber frustum and the fixed rubber frustum are pressed together by the spring and the trapezoidal slot, and together they disengage from the trapezoidal slot, realizing the separation of adjacent rubber sleeves. At the same time, the plug and interface are disengaged, completing the rapid disconnection of the circuit.

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