Borehole transient electromagnetic composite shield positioning device and method of use

Abstract

This invention belongs to the field of transient electromagnetic detection in coal mine boreholes, and relates to a borehole transient electromagnetic composite shielding positioning device and its usage method. The borehole transient electromagnetic composite shielding positioning device includes a borehole assembly, a probe tube, a control unit, a drive assembly, and a detection assembly. The detection assembly includes a transmitting component and a receiving component, which are disposed within the detection assembly and include a first receiving coil, a second receiving coil, and a third receiving coil. A first shielding cover has a first receiving port, and a second shielding cover has a second receiving port. The control unit is connected to both the transmitting and receiving components. The drive assembly includes a drive component and a connecting component. The drive component is disposed inside the probe tube and connected to the control unit. One end of the connecting component is connected to both the transmitting and receiving components, and the other end is connected to the drive component. This invention's borehole transient electromagnetic composite shielding positioning device improves monitoring accuracy by setting the receiving direction of the receiving coils.

Description

Technical Field

[0001] This invention belongs to the field of transient electromagnetic detection in underground coal mine boreholes, and relates to a borehole transient electromagnetic composite shielding positioning device and its usage method. Background Technology

[0002] The transient electromagnetic method in mine boreholes involves transmitting and receiving signals. A primary field is generated by applying current to the transmission loop and then the current is turned off. The change of the secondary field induced by the electrically inhomogeneous body in the coal and rock mass over time is measured during the transmission interval. This method is mainly used to solve geological problems such as the detection of water-bearing geological anomalies and the prediction and forecasting of water hazards in underground coal mines.

[0003] Currently, most downhole transient electromagnetic (TEM) detection systems employ dipole or three-component receivers. They utilize axial (vertical) dipole devices for transmission and reception, with vertical or horizontal components assisting in orientation. The transceiver, power supply, and control circuitry are integrated into the probe, which is then pushed by the drilling rig for point detection within the borehole. However, due to the limited borehole space, existing downhole TEM detection devices have low resolution. Furthermore, TEM detection systems and methods for water-bearing anomalies suffer from the following problems: The full-space field effect during downhole detection causes inseparability of the responses on both sides of the coil, leading to unstable inversion results and an inability to distinguish whether the anomaly response originates from any single side of the coil, thus hindering the localization of the anomaly area. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention provide a borehole transient electromagnetic composite shielding positioning device, which improves monitoring accuracy by setting the receiving direction of the receiving coil. Embodiments of the present invention also provide a method for using the borehole transient electromagnetic composite shielding positioning device.

[0006] The drilling transient electromagnetic composite shielding positioning device of this invention includes:

[0007] A drilling assembly and a probe, wherein the drilling assembly and the probe are detachably connected. A detection assembly includes a transmitting component and a receiving component, which are disposed within a probe tube. The detection component includes a first shield, a second shield, a first receiving coil, a second receiving coil, and a third receiving coil. The first, second, and third receiving coils are disposed within the probe tube and arranged sequentially at intervals along the axial direction of the probe tube. The first receiving coil is disposed within the first shield, and the third receiving coil is disposed within the second shield. The transmitting coil surrounds the outside of the receiving component. The first shield has a first receiving port, and the second shield has a second receiving port. The opening directions of the first and second receiving ports are opposite. A control unit is connected to both the transmitting and receiving components. A drive assembly includes a driving component and a connecting component. The driving component is disposed within the probe tube and connected to the control unit. One end of the connecting component is connected to both the transmitting and receiving components, and the other end of the connecting component is connected to the driving component.

[0008] The borehole transient electromagnetic composite shielding positioning device of the present invention improves the monitoring accuracy by setting the receiving direction of the receiving coil.

[0009] In some embodiments, both the first shield and the second shield include a first layer and a second layer, the first layer being aluminum foil and the second layer being permalloy, the first layer and the second layer being connected, and the first layer being farther away from the receiving component relative to the second layer.

[0010] In some embodiments, the first layer has a radial dimension of 0.01 mm to 1.0 mm in the probe; And / or, the second layer has a radial dimension of 0.05 mm to 0.15 mm in the probe.

[0011] In some embodiments, the drilling transient electromagnetic composite shielding positioning device further includes a gyroscope sensor, which is disposed on the connecting component and connected to the control unit. The gyroscope sensor records the coil attitude and feeds it back to the control unit.

[0012] In some embodiments, the connecting component includes a first connecting frame, a first mounting frame, a first drive shaft, and a second drive shaft. The first connecting frame has a mounting annular groove for mounting a receiving coil. One end of the first connecting frame is connected to the driving component, and the inner side of the first connecting frame is connected to a first shielding cover and a second shielding cover. The second shielding cover is connected to one end of the second drive shaft. The other end of the second drive shaft is connected to one end of the first mounting frame. The other end of the first mounting frame is connected to one end of the first drive shaft, and the other end of the first drive shaft is connected to the first shielding cover. In some embodiments, the first connecting frame, the first mounting frame, the first drive shaft, and the second drive shaft are integrally formed.

[0013] In some embodiments, the driving component includes a driving member and a driving shaft, wherein the driving member is connected to one end of the driving shaft and the other end of the driving shaft is connected to the first connecting frame; And / or, the drive shaft, the first transmission shaft, and the second transmission shaft are arranged collinearly.

[0014] In some embodiments, a power supply component is also included, which is connected to the control unit.

[0015] In some embodiments, the drilling assembly includes a drill bit, a tapered member, and a connector. The tapered member and the drill bit are disposed on a probe tube. The tapered member is sleeved on the drill bit. The connector is connected to the end of the probe tube away from the drill bit and the tapered member. The drill bit, tapered member, and connector are made of non-magnetic alloy steel.

[0016] The method of using the drilling transient electromagnetic composite shielding positioning device according to an embodiment of the present invention, utilizing the drilling transient electromagnetic composite shielding positioning device, includes: Fixed-point detection of the borehole: Multiple fixed points are set for the borehole, and the multiple fixed points are arranged at intervals in the axial direction of the borehole. When at the fixed point position, the borehole is rotated by a preset rotation interval angle. When detecting the top cover, the preset interval angle and the number of rotations are equal to 180°. Rapid borehole detection includes: pushing the drill rod axially at a preset constant speed to drive the detection component to rotate continuously at a preset angular velocity, and combining the real-time attitude of the gyroscope to achieve rotation detection.

[0017] The borehole transient electromagnetic composite shielding positioning device of the present invention improves the monitoring accuracy by setting the receiving direction of the receiving coil. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the drilling transient electromagnetic composite shielding positioning device according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the receiving component according to an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the transmitting component according to an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of a drill drive assembly according to an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the first and second layers in an embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the interval angle during fixed-point detection in a borehole according to an embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the rotation angle during rapid detection in a borehole according to an embodiment of the present invention.

[0025] Figure label: Drilling assembly 1, drill bit 11, tapered part 12, connector 13. Probe 2, Detection component 3, transmitting component 31, transmitting coil 311, receiving component 32, first receiving coil 321, second receiving coil 322, third receiving coil 323, first shielding cover 324, first receiving port 3241, second shielding cover 325, second receiving port 3251, first layer 326, second layer 327. Control Unit 4 Drive assembly 5, drive component 51, drive element 511, drive shaft 512, Connecting component 52, first mounting frame 521, first drive shaft 522, second drive shaft 523 Drill hole 6, surrounding rock 7. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] The drilling transient electromagnetic composite shielding positioning device of this invention includes: Drilling assembly 1 and probe 2 are detachably connected. The detection component 3 includes a transmitting component 31 and a receiving component 32, which are disposed inside the probe tube 2. The detection component includes a first receiving coil 321, a second receiving coil 322, and a third receiving coil 323, which are disposed inside the probe tube 2 and arranged sequentially at intervals along the axial direction of the probe tube 2. The first receiving coil 321 is disposed inside a first shielding cover 324, and the third receiving coil 323 is disposed inside a second shielding cover 325. The transmitting coil 311 surrounds the outside of the receiving component 32. The first shielding cover 324 is provided with a first receiving port 3241, and the second shielding cover 325 is provided with a second receiving port 3251. The opening directions of the first receiving port 3241 and the second receiving port 3251 are opposite. Control unit 4 is connected to transmitting component 31 and receiving component 32 respectively; The drive assembly 5 includes a drive component 51 and a connecting component 52. The drive component 51 is disposed inside the probe 2 and connected to the control unit 4. One end of the connecting component 52 is connected to the transmitting component 31 and the receiving component 32 respectively, and the other end of the connecting component 52 is connected to the drive component 51.

[0028] Specifically, such as Figures 1 to 7 As shown, the axis of probe 2 is in the left-right direction, as... Figure 1 As shown, the drilling assembly 1 is located at the left end of the probe 2, and the right end of the probe 2 is detachably connected to the drill rod for easy installation on the drill rod.

[0029] Inside the probe 2, a first receiving coil 321, a second receiving coil 322, and a third receiving coil 323 are arranged sequentially along a first direction. The first receiving coil 321 is located inside a first shielding cover 324, and the third receiving coil 323 is located inside a second shielding cover 325. The transmitting coil 311 surrounds the outside of the first receiving coil 321, the second receiving coil 322, and the third receiving coil 323, and is also located outside the first shielding cover 324 and the second shielding cover 325, so as to avoid the first shielding cover 324 and the second shielding cover 325 affecting the primary field generated by the transmitting coil 311, so as to ensure that the transmitting component 31 stably generates a primary field.

[0030] The opening of the first shielding cover 324 faces opposite directions to the opening of the second shielding cover 325. For example, for ease of description, the opening of the first shielding cover 324 faces upwards, and the opening of the second shielding cover 325 faces downwards. This allows them to receive secondary field information from opposite directions. For instance, the first receiving coil 321 collects secondary field information from the upper surrounding rock 7, while the first shielding cover 324 shields the magnetic field lines in the left-right direction and the lower surrounding rock 7, so that the first receiving coil 321 only collects secondary field information from the surrounding rock 7 in the direction of the opening of the first shielding cover 324. Similarly, the third receiving coil 323 collects secondary field information from the lower surrounding rock 7, while the third shielding cover shields the magnetic field lines in the left-right direction and the upper surrounding rock 7, so that the third receiving coil 323 only collects secondary field information from the surrounding rock 7 in the direction of the opening of the second shielding cover 325.

[0031] The second receiving coil 322 is not shielded and is used to receive the secondary field signal of the surrounding rock 7 in the whole space and to detect the surrounding rock 7. The first shield 324 and the second shield 325 are used to distinguish the responses on both sides in the up and down directions, improve the accuracy of locating anomalies in the surrounding rock 7 and reduce interference, so as to improve the efficiency and accuracy of transient electromagnetic detection in borehole 6.

[0032] Control unit 4 is connected to transmitting component 31 and receiving component 32 respectively; control unit 4 is connected to transmitting coil 311 and first receiving coil 321, second receiving coil 322 and third receiving coil 323, transmitting electromagnetic signals and receiving response signals.

[0033] The driving component 51 drives the connecting component 52 to rotate, thereby causing the transmitting component 31 and the receiving component 32 to rotate to achieve omnidirectional detection.

[0034] The borehole transient electromagnetic composite shielding positioning device of this invention improves monitoring accuracy by setting the receiving direction of the receiving coils. The first receiving coil 321 and the third receiving coil 323 are respectively housed in shields with opposite opening directions, enabling them to receive secondary field signals from different directions (e.g., above and below). The second receiving coil 322 is not shielded and receives secondary field signals from the entire space, providing a comprehensive electromagnetic response reference. By comparing the full-space signal of the second receiving coil 322 with the directional signals of the first and third receiving coils 323, the specific location of the anomaly can be determined more accurately, allowing the device to clearly identify the source direction of the anomaly response and improve detection accuracy. The first shield 324 and the second shield 325 can shield magnetic field interference from non-detection directions, allowing the first receiving coil 321 and the third receiving coil 323 to receive signals only from specific directions for detecting the surrounding rock 7 in that specific direction. This significantly improves the positioning accuracy of the anomaly, reduces interference, and increases detection efficiency and accuracy, while maintaining operational flexibility and convenience.

[0035] In some embodiments, the first shielding cover 324 and the second shielding cover 325 each include a first layer 326 and a second layer 327. The first layer 326 is aluminum foil and the second layer 327 is permalloy. The first layer 326 and the second layer 327 are connected, and the first layer 326 is farther away from the receiving component 32 relative to the second layer 327.

[0036] Specifically, such as Figures 1 to 7 As shown, aluminum foil reduces electromagnetic interference by reflecting and absorbing electromagnetic waves. By reflecting and partially absorbing electromagnetic waves, it reduces the interference of external magnetic fields from non-opening directions on the internal receiving coil, thus improving detection accuracy. Permalloy provides significant shielding against low-frequency magnetic fields and is suitable for lower-frequency electromagnetic signals. In transient electromagnetic methods, the low-frequency components of the primary and secondary fields can be effectively shielded by permalloy. By combining aluminum foil (first layer 326) and permalloy (second layer 327), the double-layer structure can simultaneously shield both high-frequency and low-frequency electromagnetic signals. The aluminum foil is responsible for reflecting and absorbing high-frequency electromagnetic waves, while the permalloy focuses on shielding low-frequency magnetic fields.

[0037] In this embodiment, the first shielding cover 324 and the second shielding cover 325 employ a double-layer structure of aluminum foil and permalloy to shield high-frequency and low-frequency electromagnetic signals. The aluminum foil reduces interference by reflecting and absorbing high-frequency electromagnetic waves, while the permalloy guides and concentrates low-frequency magnetic field lines through its high permeability, reducing magnetic field penetration. This improves the shielding effect of high-frequency and low-frequency electromagnetic signals, reduces interference from external magnetic fields in non-detection directions, improves the accuracy of anomaly location and the signal-to-noise ratio, and enhances the stability of the device.

[0038] In some embodiments, the first layer 326 has a radial dimension of 0.01 mm to 1.0 mm in the probe 2; And / or, the second layer 327 has a radial dimension of 0.05mm to 0.15mm in the probe 2.

[0039] Specifically, such as Figures 1 to 7As shown, thicker aluminum foil provides better shielding. For example, the thickness of the first 326 layer can be 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.20mm, 0.21mm, 0. 22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.30mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, 0.3 5mm, 0.36mm, 0.37mm, 0.38mm, 0.39mm, 0.40mm, 0.41mm, 0.42mm, 0.43mm, 0.44mm, 0.45mm, 0.46mm, 0.47mm, 0.48 mm, 0.49mm, 0.50mm, 0.51mm, 0.52mm, 0.53mm, 0.54mm, 0.55mm, 0.56mm, 0.57mm, 0.58mm, 0.59mm, 0.60mm, 0.61 mm, 0.62mm, 0.63mm, 0.64mm, 0.65mm, 0.66mm, 0.67mm, 0.68mm, 0.69mm, 0.70mm, 0.71mm, 0.72mm, 0.73mm, 0.74m Meters in diameter: m, 0.75mm, 0.76mm, 0.77mm, 0.78mm, 0.79mm, 0.80mm, 0.81mm, 0.82mm, 0.83mm, 0.84mm, 0.85mm, 0.86mm, 0.87mm, 0.88mm, 0.89mm, 0.90mm, 0.91mm, 0.92mm, 0.93mm, 0.94mm, 0.95mm, 0.96mm, 0.97mm, 0.98mm, 0.99mm, 1.00mm. These meters effectively reflect and absorb high-frequency electromagnetic waves, reducing interference from external magnetic fields.

[0040] Permalloy with a thickness ranging from 0.05mm to 0.15mm can effectively shield low-frequency magnetic fields. For example, the thickness can be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, or 0.15mm. The first layer 326 and the second layer 327 are connected, and the synergistic effect of the double-layer structure improves the shielding effect, reduces interference from external magnetic fields, improves the accuracy of anomaly location and the signal-to-noise ratio, and is suitable for complex geological environments.

[0041] In some embodiments, the drilling transient electromagnetic composite shielding positioning device further includes a gyroscope sensor, which is mounted on the connecting component 52 and connected to the control unit 4. The gyroscope sensor records the coil attitude and feeds it back to the control unit 4.

[0042] The gyroscope sensor can monitor and record the attitude information of probe 2 and coil in real time. This includes the coil's tilt angle and azimuth parameters, ensuring that the coil maintains a preset attitude throughout the detection process.

[0043] The gyroscope sensor is connected to the control unit 4, and provides attitude data to the control unit 4 in real time. The control unit 4 can dynamically adjust the drive component 51 based on this data to ensure the stability and accuracy of the coil's attitude during the detection process. The attitude data provided by the gyroscope sensor can be used for orientation of the detection direction. Through the coil's attitude information, the detection direction can be determined more accurately, improving the accuracy of anomaly location. The gyroscope sensor can not only record the coil's attitude but also the drilling trajectory, allowing the operator to understand the direction and depth of the borehole 6, ensuring that the borehole 6 follows the predetermined path. The gyroscope sensor can provide real-time position and attitude information of the drill bit 11. This allows the operator to adjust the drilling direction in a timely manner, preventing the borehole 6 from deviating from the target area, improving detection efficiency and success rate.

[0044] Furthermore, in complex geological environments, borehole 6 will inevitably experience tilting and bending. The gyroscope sensor can monitor these changes in real time and make dynamic adjustments through the control unit 4 to ensure the adaptability and reliability of the drilling rig or the entire borehole 6 system in complex environments.

[0045] In some embodiments, the connecting component 52 includes a first connecting frame, a first mounting frame 521, a first drive shaft 522, and a second drive shaft 523. The first connecting frame is provided with a mounting ring groove for mounting a receiving coil. One end of the first connecting frame is connected to the driving component 51, and the inner side of the first connecting frame is connected to the first shielding cover 324 and the second shielding cover 325 respectively. The second shielding cover 325 is connected to one end of the second drive shaft 523, and the other end of the second drive shaft 523 is connected to one end of the first mounting frame 521. The other end of the first mounting frame 521 is connected to one end of the first drive shaft 522, and the other end of the first drive shaft 522 is connected to the first shielding cover 324.

[0046] Specifically, such as Figures 1 to 7As shown, the right end of the first connecting frame is connected to the left end of the first drive shaft 522. A receiving coil is mounted on the first connecting frame. The first connecting frame is also connected to the first shielding cover 324 and the second shielding cover 325. The left end of the first drive shaft 522 is connected to the first shielding cover 324, and the right end of the first drive shaft 522 is connected to the left end of the first mounting frame 521. The first mounting frame 521 is adapted to mount the second receiving coil 322. The right end of the first mounting frame 521 is connected to the left end of the second drive shaft 523, and the right end of the second drive shaft 523 is connected to the left end of the second shielding cover 325. The first shielding cover 324, the second shielding cover 325, the transmitting coil 311, the first receiving coil 321, the second receiving coil 322, and the third receiving coil 323 are then connected so that the driving component 51 can drive the transmitting component 31 and the receiving component 32 to rotate together.

[0047] In this embodiment, the first shielding cover 324, the second shielding cover 325, the transmitting coil 311, the first receiving coil 321, the second receiving coil 322 and the third receiving coil 323 are connected together by the connecting component 52. When the driving component 51 is driven, the transmitting component 31 and the receiving component 32 rotate together to achieve all-round detection, which improves the efficiency and accuracy of detection.

[0048] In some embodiments, the first connecting frame, the first mounting frame 521, the first drive shaft 522, and the second drive shaft 523 are integrally formed to improve structural strength.

[0049] In some embodiments, the drive component 51 includes a drive element 511 and a drive shaft 512. The drive element 511 is connected to one end of the drive shaft 512, and the other end of the drive shaft 512 is connected to the first connecting frame. The drive element 511 can be an existing servo motor or a stepper motor. Alternatively, the drive component 51 may also include an angle sensor connected to the control unit 4. The angle sensor monitors the rotation angle of the drive shaft 512. The angle sensor can also be corroborated with a gyroscope sensor to improve the reliability of rotation angle monitoring.

[0050] In some embodiments, the drive shaft 512, the first transmission shaft 522, and the second transmission shaft 523 are arranged coaxially. Coaxial rotation ensures that the transmitting coil 311 and the receiving coil maintain a consistent orientation during rotation. This ensures that the detection direction and angle of the transmitting and receiving coils remain consistent at different positions, reducing errors caused by attitude changes. Coaxial rotation also reduces eccentric forces and torque during power transmission, lowering mechanical vibration and making the device more stable during rotation, thus improving stability and safety.

[0051] In some embodiments, a power supply component is also included, which is connected to the control unit 4. The power supply component is also connected to the drive component 51 and the gyroscope. The control unit 4 controls the power supply component to supply power to the drive component 51 and the detection component 3, so that the entire device does not require an external power supply and improves the stability of operation.

[0052] In some embodiments, the drilling assembly 1 includes a drill bit 11, a tapered member 12, and a connector 13. The tapered member 12 and the drill bit 11 are disposed on the probe tube 2. The tapered member 12 is sleeved on the drill bit 11. The connector 13 is connected to the end of the probe tube 2 away from the drill bit 11 and the tapered member 12. The drill bit 11, the tapered member 12, and the connector 13 are made of non-magnetic alloy steel. The connector is detachably connected to the right end of the probe tube 2, and the right end of the connector can be connected to the drill rod to facilitate simultaneous drilling and probing. The connector can be an existing connecting device or connecting assembly, or a lead screw or nut.

[0053] In this embodiment, the drilling assembly 1 uses a drill bit 11, a tapered component 12, and a connector 13 made of non-magnetic alloy steel, which has significant advantages. The low magnetic permeability of non-magnetic alloy steel reduces magnetic field interference and improves the quality and accuracy of the detection signal. At the same time, its high strength and wear resistance enhance the reliability and service life of the equipment.

[0054] The method of using the drilling transient electromagnetic composite shielding positioning device according to the embodiments of the present invention utilizes the drilling transient electromagnetic composite shielding positioning device, including: Multiple fixed points are set for the borehole 6, and the multiple fixed points are arranged at intervals in the axial direction of the borehole 6. When the fixed point is in position, it is rotated by a preset rotation interval angle. The preset interval angle and the number of rotations during the top cover detection are equal to 180°. For example, the interval angle can be θ.

[0055] Rapid detection of borehole 6 is achieved by pushing the drill rod axially at a preset constant speed, causing the detection component 3 to rotate continuously at a preset angular velocity, and combining this with the real-time attitude of the gyroscope to detect the rotation. For example, the preset angle can be θ.

[0056] The borehole transient electromagnetic composite shielding positioning device of the present invention improves the monitoring accuracy by setting the receiving direction of the receiving coil.

[0057] Specifically, such as Figures 1 to 7 As shown, at a fixed point, the interval angle is 30°, and the distance between multiple fixed points is d. At a single fixed point, the driving component 51 drives the transmitting component 31 and the receiving component 32 to rotate 6 times to achieve detection in the 360° direction.

[0058] Fixed-point detection involves rotating the coil at each measuring point to collect data from multiple angles, suitable for detailed observation in key areas. Continuous detection involves collecting data from each measuring point at a single angle and rotating synchronously with the drilling process, suitable for large-scale rapid screening. It can be flexibly switched according to the characteristics of the target and geological conditions.

[0059] Furthermore, the fixed-point detection uses a programmable micro motor to drive the transceiver coil and composite shielding structure to rotate at a preset rotation interval angle θ, and performs full-time window data acquisition at each angular position. For abnormal areas or preset key sections identified by the fixed-point detection, fine data acquisition with multiple time windows and high superposition times can be performed at fixed angular positions to improve the signal-to-noise ratio and resolution.

[0060] For rapid detection, the drill rod is pushed axially at a constant speed, causing the transceiver coil to rotate continuously at a preset angular velocity. Combined with real-time attitude measurement using a gyroscope, rotational detection is achieved. In this mode, the system completes 360° circumferential data acquisition within each rotation cycle. The axial spacing can be dynamically adjusted via drilling speed and rotational speed, enabling rapid detection over a wide area, reducing detection time, and providing a general overview of the surrounding rock in area 7, thus improving detection efficiency. Furthermore, the gyroscope sensor facilitates the differentiation of the direction of abnormal areas.

[0061] In this embodiment, the fixed-point detection mode achieves 360° omnidirectional detection by acquiring data from multiple angles (e.g., at 30° intervals) at each fixed point, improving the accuracy of anomaly location. For anomaly areas or key sections, fine data acquisition with multiple time windows and high stacking times can be performed at fixed angle positions. This helps improve the signal-to-noise ratio and resolution, further enhancing detection accuracy. The drill rod is pushed axially at a constant speed, simultaneously driving the detection component 3 to rotate continuously at a preset angular velocity, forming a three-dimensional spiral trajectory detection path. In this mode, the system completes 360° circumferential data acquisition in each rotation cycle. The axial spacing can be dynamically adjusted by the drilling speed and rotation speed, improving the efficiency of large-area detection and reducing detection time. The rapid detection mode, through continuous rotation and dynamic adjustment of the axial spacing, can quickly cover a large area, significantly reducing detection time. Both fixed-point and rapid detection modes can achieve 360° omnidirectional coverage, reducing detection blind spots. This ensures comprehensive detection of anomalies and improves detection reliability. Depending on the characteristics of the detection target and geological conditions, the device can flexibly switch between fixed-point and rapid detection modes to enable the device to perform optimally in different scenarios.

[0062] Furthermore, through real-time attitude feedback from the gyroscope, the device can adjust its detection direction and attitude in real time. This gives the device better adaptability and stability in complex geological environments. Combined with the gyroscope sensor, it facilitates the differentiation of directions in abnormal areas, further improving detection accuracy.

[0063] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0065] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0066] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0067] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0068] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A drilling transient electromagnetic composite shielding positioning device, characterized in that, include: A drilling assembly and a probe, wherein the drilling assembly and the probe are detachably connected; A detection assembly includes a transmitting component and a receiving component, which are disposed within a probe tube. The receiving component includes a first shield, a second shield, a first receiving coil, a second receiving coil, and a third receiving coil. The first receiving coil, the second receiving coil, and the third receiving coil are disposed within the probe tube and arranged sequentially at intervals along the axial direction of the probe tube. The first receiving coil is disposed within the first shield, and the third receiving coil is disposed within the second shield. The transmitting coil surrounds the outside of the receiving component. The first shield has a first receiving port, and the second shield has a second receiving port. The opening directions of the first receiving port and the second receiving port are opposite. A control unit, which is connected to both the transmitting component and the receiving component; The driving assembly includes a driving component and a connecting component. The driving component is disposed inside the probe and connected to the control unit. One end of the connecting component is connected to the transmitting component and the receiving component respectively, and the other end of the connecting component is connected to the driving component.

2. The drilling transient electromagnetic composite shielding positioning device according to claim 1, characterized in that, Both the first shield and the second shield include a first layer and a second layer. The first layer is aluminum foil, and the second layer is permalloy. The first layer and the second layer are connected, and the first layer is farther away from the receiving component relative to the second layer.

3. The drilling transient electromagnetic composite shielding positioning device according to claim 2, characterized in that, The first layer has a radial dimension of 0.01 mm to 1.0 mm in the probe. And / or, the second layer has a radial dimension of 0.05 mm to 0.15 mm in the probe.

4. The drilling transient electromagnetic composite shielding positioning device according to claim 1, characterized in that, It also includes a gyroscope sensor, which is mounted on the connecting component and connected to the control unit. The gyroscope sensor records the coil attitude and feeds it back to the control unit.

5. The drilling transient electromagnetic composite shielding positioning device according to claim 1, characterized in that, The connecting component includes a first connecting frame, a first mounting frame, a first drive shaft, and a second drive shaft. The first connecting frame has a mounting ring groove for mounting a receiving coil. One end of the first connecting frame is connected to the driving component, and the inner side of the first connecting frame is connected to a first shield and a second shield respectively. The second shield is connected to one end of the second drive shaft, and the other end of the second drive shaft is connected to one end of the first mounting frame. The other end of the first mounting frame is connected to one end of the first drive shaft, and the other end of the first drive shaft is connected to the first shield.

6. The drilling transient electromagnetic composite shielding positioning device according to claim 5, characterized in that, The first connecting frame, the first mounting frame, the first drive shaft, and the second drive shaft are integrally formed.

7. The drilling transient electromagnetic composite shielding positioning device according to claim 6, characterized in that, The driving component includes a driving element and a driving shaft. The driving element is connected to one end of the driving shaft, and the other end of the driving shaft is connected to the first connecting frame. And / or, the drive shaft, the first transmission shaft, and the second transmission shaft are arranged collinearly.

8. The drilling transient electromagnetic composite shielding positioning device according to claim 1, characterized in that, It also includes a power supply component, which is connected to the control unit.

9. The drilling transient electromagnetic composite shielding positioning device according to claim 1, characterized in that, The drilling assembly includes a drill bit, a tapered component, and a connector. The tapered component and the drill bit are mounted on a probe tube. The tapered component is fitted onto the drill bit. The connector is connected to the end of the probe tube away from the drill bit and the tapered component. The drill bit, tapered component, and connector are made of non-magnetic alloy steel.

10. A method of using a drilling transient electromagnetic composite shielding positioning device, comprising the drilling transient electromagnetic composite shielding positioning device according to any one of claims 1-9, characterized in that, include: The borehole is subjected to fixed-point detection, which includes setting multiple fixed points in the borehole, the multiple fixed points being arranged at intervals in the axial direction of the borehole, and rotating at a preset rotation interval angle when at the fixed point position, and the preset interval angle and the number of rotations when detecting the top cover are equal to 180°. Rapid detection of the borehole includes: pushing the drill rod axially at a preset constant speed to drive the detection component to rotate continuously at a preset angular velocity, and combining the real-time attitude of the gyroscope to realize rotation detection.

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