A magnetic positioning method suitable for a docking well

Abstract

The application relates to the field of oil and gas well drilling engineering, and discloses a magnetic positioning method suitable for butt joint wells, which comprises the following steps: magnetic field generation: a controllable rotating magnetic field is generated through a downhole magnetic field generation module; real-time magnetic field measurement: the strength, direction and gradient change of the rotating magnetic field are obtained by using a magnetic measurement module; data transmission: the magnetic field data collected by the magnetic measurement module is transmitted to a ground system through electromagnetic wave signals; data processing and position calculation: the magnetic field signals are analyzed by the ground system, and the relative position of the target well and the drill bit is calculated; guiding adjustment: according to the calculation result of the ground system, the pushing force size and direction of the downhole guiding device are automatically adjusted. Through the organic combination of the magnetic field generation, the real-time magnetic field measurement and the gradient inversion algorithm, the application realizes high-precision inter-well position calculation at the centimeter level, ensures that the positioning and guiding adjustment in the butt joint well operation are more accurate, and simultaneously adapts to the diversified needs of complex well trajectories and deep well scenes.

Description

Technical Field

[0001] This invention relates to the field of oil and gas well drilling engineering, specifically to a magnetic positioning method suitable for docking wells. Background Technology

[0002] Docking well construction is a crucial engineering technology in oil and gas well development, widely applied in high-pressure well control, old well plugging, and gas storage development. Precisely locating the target well and achieving docking between the drill bit and the target well is a key step in docking well construction. The use of magnetic field measurement technology for inter-well positioning and guidance adjustment has become one of the main development directions in the industry.

[0003] Existing magnetic positioning methods utilize rotating magnetic field generation technology and magnetic field measurement devices to achieve real-time measurement of inter-well positions. Their advantage lies in providing rapid relative position information between wells and enabling directional guidance for docking wells. This type of technology offers high real-time performance and is suitable for docking well construction at lower depths and with single well trajectories. The employed filtering algorithm and fixed sensor arrangement improve the stability of data measurements and provide a degree of adaptability to downhole operations.

[0004] However, existing technologies have insufficient adaptability in complex well trajectories, highly deviated wells, and deep well environments; the accuracy of their magnetic field measurements is easily affected by vibration, well fluid erosion, and external magnetic interference, and their response speed to directional adjustment and the flexibility of the push-fit device are relatively weak; in addition, the lack of environmental adaptability design and dynamic adjustment capability leads to the accumulation of data errors and unstable equipment operation in high-pressure and high-temperature environments, which cannot meet the requirements of high-precision and real-time docking well operations. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a magnetic positioning method suitable for docking wells, solving the problem of insufficient adaptability of existing magnetic positioning methods in complex well trajectories, highly deviated wells, and deep well environments.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a magnetic positioning method suitable for docking wells, comprising the following steps:

[0007] Magnetic field generation: A rotating magnetic field with controllable intensity is generated through the downhole magnetic field generation module;

[0008] Real-time magnetic field measurement: The intensity, direction, and gradient changes of the rotating magnetic field are obtained using a magnetic measurement module;

[0009] Data transmission: The magnetic field data collected by the magnetic measurement module is transmitted to the ground system via electromagnetic wave signals;

[0010] Data processing and location calculation: The ground system analyzes the magnetic field signal and calculates the relative position of the target well and the drill bit;

[0011] Guidance adjustment: Based on the calculation results of the surface system, the magnitude and direction of the thrust of the downhole guidance device are automatically adjusted;

[0012] Closed-loop calibration: Through real-time interaction between the downhole and surface systems, the relative position of the magnetic measurement module and the drill bit is periodically calibrated until the precise connection of the docking well is achieved.

[0013] Preferably, the magnetic field generation includes the following steps:

[0014] A rotating magnetic field is generated using high-performance rare-earth magnets.

[0015] The arrangement and shape of the magnets are optimized through finite element simulation to ensure magnetic field uniformity;

[0016] A magnetic shielding structure is installed outside the downhole magnetic field generation module to shield it from external magnetic field interference.

[0017] Preferably, the real-time magnetic field measurement includes the following steps:

[0018] Equipped with a triaxial magnetic field sensor to capture the direction, intensity, and gradient of the rotating magnetic field;

[0019] The gradient algorithm is used to calculate the relative distance, azimuth, and inclination angle between the two wells.

[0020] The magnetic measurement module incorporates a seismic-resistant design, including a hollow multi-layer structure and seismic-resistant filling material, to reduce the impact of bottom hole vibration on measurement accuracy.

[0021] Preferably, the data transmission includes the following steps:

[0022] The magnetic measurement module transmits the collected magnetic field data to the ground system via narrowband electromagnetic wave signals;

[0023] In long-distance transmission scenarios, multiple signal relay devices are configured, with a node placed every 1500 to 2000 meters to enhance signal strength and stability;

[0024] The ground system filters the received signal to remove external interference and noise.

[0025] Preferably, the data processing and location calculation includes the following steps:

[0026] An anti-interference filtering algorithm is used to analyze the magnetic field signal and extract the effective signal data.

[0027] The relative distance between wells is calculated based on a rotating magnetic field model and a gradient inversion algorithm.

[0028] By using geometric calculation methods combined with well inclination and azimuth information, the precise location of the target well can be determined.

[0029] Preferably, the guiding adjustment includes the following steps:

[0030] The ground system generates guidance adjustment commands, which include the magnitude and direction of the thrust force.

[0031] The downhole guiding device adjusts the direction of the pushing device in real time using hydraulic drive according to the received instructions;

[0032] In full rotation mode, the drill bit direction is dynamically adjusted to align it with the target point of the well.

[0033] Preferably, the closed-loop calibration includes the following steps:

[0034] The downhole magnetic measurement module transmits measurement data to the surface system every 5 minutes, and the surface system automatically calibrates the drill bit orientation.

[0035] When the deviation of the measurement data exceeds the preset threshold, the ground system generates a correction command to adjust the drill bit direction and the pushing force of the pushing device in real time.

[0036] When the distance to the target well is less than 2 meters, the calibration frequency is increased to once per minute, and the time-controlled drilling mode is entered.

[0037] Preferably, the method further includes an environmentally adaptable design step, comprising:

[0038] A multi-layer sealing design is adopted to protect downhole equipment and prevent high-pressure well fluid from entering;

[0039] The magnetic field generating module and guiding device are manufactured using high-temperature resistant and corrosion-resistant materials;

[0040] Apply magnetic shielding material to the surface of critical equipment to reduce external magnetic interference.

[0041] Preferably, the pushing device has an automatic optimization function during guidance adjustment, specifically including:

[0042] The position of the push-fit device's action point is dynamically adjusted to adapt to different well inclination curvatures;

[0043] Adjust the pushing force based on the distance deviation between the target well and the drill bit to improve the accuracy of drill bit orientation adjustment.

[0044] Preferably, the method incorporates a dynamic adjustment mechanism in the arrangement of the downhole magnetic measurement module, including:

[0045] When the vertical distance between the magnetic measurement module and the target well exceeds the preset value of 20 meters, the position of the magnetic measurement module is adjusted by using a coiled tubing truck.

[0046] Ensure that the vertical distance between the magnetic measurement module and the target well is always less than 20 meters to improve measurement accuracy and the system's response speed to guidance adjustments.

[0047] This invention provides a magnetic positioning method suitable for docking wells. It has the following beneficial effects:

[0048] 1. This invention achieves centimeter-level high-precision well-to-well position calculation by organically combining magnetic field generation, real-time magnetic field measurement and gradient inversion algorithm, ensuring more accurate positioning and guidance adjustment in docking well operations, while adapting to the diverse needs of complex well trajectories and deep well scenarios.

[0049] 2. By adopting a dynamic adjustment mechanism and an automatic optimization push-and-pull device design, this invention enables the guidance adjustment to have a higher response speed and directional accuracy, maintains stable performance in complex downhole environments, and significantly improves the success rate of docking wells and operational efficiency.

[0050] 3. This invention, through environmentally adaptable design and closed-loop control technology, ensures the reliable operation of the equipment in high-pressure, high-temperature and vibration environments, and realizes real-time coordination between the downhole and surface systems, providing reliable and efficient support for docking well construction. Attached Figure Description

[0051] Figure 1 This is a flowchart of the method of the present invention. Detailed Implementation

[0052] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] Please see the appendix Figure 1 This invention provides a magnetic positioning method suitable for docking wells, the method comprising the following steps:

[0054] Magnetic field generation: A controllable rotating magnetic field is generated by the downhole magnetic field generation module. The rotating magnetic field utilizes the changing magnetic flux generated by the magnetic material in the rotating state to form a stable magnetic field signal. Optimizing the magnet design can reduce the distortion of the magnetic field distribution and improve the signal integrity in long-distance transmission. At the same time, by sensing the changes in the intensity and direction of the rotating magnetic field, the spatial relationship between the magnetic measurement module and the target well can be accurately determined.

[0055] Real-time magnetic field measurement: By using a magnetic measurement module to obtain the intensity, direction and gradient changes of the rotating magnetic field, real-time magnetic field measurement achieves high-precision well-to-well positioning, especially under conditions of high vibration and complex well trajectory, and can maintain the stability and accuracy of measurement data;

[0056] Data transmission: The magnetic field data collected by the magnetic measurement module is transmitted to the ground system via electromagnetic wave signals. Data transmission can ensure the real-time performance and stability of data transmission, especially in deep well and long-distance operation scenarios, solving the signal loss problem commonly found in traditional signal transmission methods.

[0057] Data processing and position calculation: The ground system analyzes the magnetic field signal and calculates the relative position of the target well and the drill bit. Data processing and position calculation can provide high-precision spatial position information, ensuring that the drill bit is always pointing towards the target point of the target well, and improving the success rate of docking well operations;

[0058] Guiding adjustment: Based on the calculation results of the surface system, the magnitude and direction of the pushing force of the downhole guiding device are automatically adjusted. Guiding adjustment can accurately adjust the drill bit direction, avoid docking failure caused by well trajectory deviation, and adapt to complex well trajectories and high-angle docking scenarios.

[0059] Closed-loop calibration: Through real-time interaction between the downhole and surface systems, the relative position of the magnetic measurement module and the drill bit is periodically calibrated until the docking well is accurately connected. Closed-loop calibration can improve the success rate of docking wells, especially in the process of precise docking near the target well, reducing the risk of error accumulation and achieving centimeter-level precise connection.

[0060] Please see the appendix Figure 1 In a preferred embodiment of the present invention, the magnetic field generation includes the following steps:

[0061] A rotating magnetic field is generated using high-performance rare-earth magnets. This rotation is achieved through the high-speed rotation of the magnets, and the resulting change in magnetic flux creates a dynamic magnetic field in space. Due to their high magnetic properties, rare-earth magnets can provide sufficiently strong magnetic fields within a small volume, meeting the magnetic field strength requirements of deep well operations. The high magnetic properties and excellent heat resistance of rare-earth magnets ensure the strength and stability of the rotating magnetic field, providing a high-quality signal source for subsequent magnetic field measurements.

[0062] The arrangement and shape of the magnets are optimized by finite element simulation to ensure magnetic field uniformity. A three-dimensional simulation model of the rotating magnetic field is established using finite element analysis software (such as ANSYS or COMSOL). The geometric parameters, material properties and working environment conditions of the magnets are input. Finite element simulation accurately simulates the magnetic field distribution of the magnets in the downhole environment through numerical calculation methods. The optimized magnet arrangement and shape can reduce the gradient change of the magnetic field and improve the measurement accuracy.

[0063] A magnetic shielding structure is installed on the outside of the downhole magnetic field generating module to shield it from external magnetic field interference. The magnetic shielding material absorbs and guides the interference signal of the external magnetic field, ensuring the purity of the rotating magnetic field signal and improving the stability and reliability of magnetic field measurement. The multi-layer stacked design enhances the safety and long-term performance of the magnetic field generating module in high-pressure environments.

[0064] Please see the appendix Figure 1 In a preferred embodiment of the present invention, real-time magnetic field measurement includes the following steps:

[0065] Equipped with a triaxial magnetic field sensor, it is used to capture the direction, intensity and gradient of the rotating magnetic field. The triaxial magnetic field sensor can capture the spatial distribution characteristics of the rotating magnetic field in real time. Its vector components provide information on the direction and intensity of the magnetic field, which can provide high resolution and high stability support for magnetic field measurement in complex downhole environments.

[0066] The gradient algorithm is used to calculate the relative distance, azimuth, and inclination angle between two wells. The gradient algorithm model is constructed as follows:

[0067] By utilizing the gradient distribution characteristics of the rotating magnetic field, a gradient calculation formula is established:

[0068]

[0069] Where ΔB represents the change in magnetic field strength, and Δd represents the distance between the sensors;

[0070] By using a gradient calculation model, the relative positional relationship between the two wells is analyzed. The gradient algorithm provides a high-precision ability to calculate the position between the two wells, enabling accurate measurement of the spatial relative relationship between the two wells in complex well trajectories, and effectively improving the success rate of docking well operations.

[0071] The magnetic measurement module incorporates a seismic-resistant design, including a hollow multi-layer structure and seismic-resistant filling material, to reduce the impact of bottom-hole vibration on measurement accuracy. The hollow multi-layer structure reduces the propagation path of vibration within the module, while the seismic-resistant filling material absorbs the energy of shock waves, converting high-frequency vibrations into low-frequency vibrations, thereby protecting the sensitive magnetic field sensor.

[0072] Please see the appendix Figure 1 In a preferred embodiment of the present invention, data transmission includes the following steps:

[0073] The magnetic measurement module transmits the collected magnetic field data to the ground system via narrowband electromagnetic wave signals. Due to its narrow bandwidth, the narrowband electromagnetic wave signals have a high power concentration and can maintain stable penetration in deep wells and complex geological conditions. At the same time, the modulation technology of the narrowband signals ensures the anti-interference and signal integrity of the data transmission, and can maintain the continuity and accuracy of the magnetic field data transmission.

[0074] In long-distance transmission scenarios, multiple signal repeater devices are configured, with a node placed every 1500 to 2000 meters to enhance signal strength and stability. The signal repeater receives and amplifies the attenuated electromagnetic wave signal, thereby extending the effective transmission distance of the signal. The node-based arrangement can effectively transmit the signal in segments, reducing signal attenuation and loss in long-distance transmission.

[0075] The ground system filters the received signal to remove external interference and noise. By eliminating interference signals, the filtering process improves the signal-to-noise ratio of the effective signal, providing a high-quality data foundation for subsequent magnetic field data calculation. Adaptive filtering technology adjusts the filtering parameters according to the dynamic changes in noise, enhancing processing efficiency.

[0076] Please see the appendix Figure 1 In a preferred embodiment of the present invention, data processing and location calculation include the following steps:

[0077] The anti-interference filtering algorithm is used to analyze the magnetic field signal and extract the effective signal data. By adjusting the filter parameters in real time, the anti-interference filtering algorithm can dynamically adapt to the signal changes in the complex downhole environment, effectively suppress external noise, and retain the original characteristic signal of the rotating magnetic field. This improves the signal-to-noise ratio of the magnetic field signal and provides accurate and stable data input for subsequent position calculation. It is particularly suitable for high-noise downhole environments.

[0078] Based on the rotating magnetic field model and combined with the gradient inversion algorithm, the relative distance between wells is calculated. The intensity decay and direction change of the rotating magnetic field have a fixed law. The gradient inversion algorithm can calculate the relative distance between wells with high accuracy, while geometric correction further improves the accuracy of the solution.

[0079] By combining geometric calculation methods with well inclination and azimuth information, the precise location of the target well is determined. Specifically: Data acquisition and input: acquire magnetic field gradient, well inclination, and azimuth data provided by the magnetic measurement module; use the well inclination data to determine the angle between the target well trajectory and the vertical direction of the ground; calculate the offset angle between the target well and the northward direction of the ground based on the azimuth data.

[0080] Geometric model solution:

[0081] Establish a geometric relationship model between the target well and the drill bit in three-dimensional space:

[0082] (x,y,z)=(r·cosθ,r·sinθ,d)

[0083] Where r is the relative horizontal distance, θ is the azimuth angle, and d is the well depth; the solution results are corrected with the real-time measurement data from the downhole magnetic measurement module.

[0084] Location optimization:

[0085] Location optimization is performed using historical data of the target well location, and the current solution results are dynamically updated to reduce errors.

[0086] By combining well inclination and azimuth information with geometric algorithms, the location of the target well is accurately determined, which significantly improves the accuracy and success rate in docking well operations, and is especially suitable for solving complex well trajectories.

[0087] Please see the appendix Figure 1 In a preferred embodiment of the present invention, the guide adjustment includes the following steps:

[0088] The ground system generates guidance adjustment commands, which include the magnitude and direction of the pushing force. The ground system dynamically generates guidance commands by calculating the magnetic field and position information. The commands contain precise pushing force and direction parameters, providing clear operation guidance for the downhole guidance device. This ensures the efficiency and accuracy of downhole guidance adjustment, while also improving the success rate of docking operations for complex well trajectories.

[0089] According to the received instructions, the downhole steering device uses hydraulic drive to adjust the direction of the push device in real time. The hydraulic drive module uses high-pressure liquid as power to drive the push device to complete the direction adjustment and force output. The real-time feedback mechanism ensures the accuracy of the adjustment process. The hydraulic drive and dynamic adjustment functions of the downhole steering device can quickly respond to ground commands, achieve precise direction adjustment and force output, and ensure that the drill bit can be smoothly guided to the target well point.

[0090] In full rotation mode, the drill bit direction is dynamically adjusted to face the target point of the well. The direction adjustment in full rotation mode relies on the dynamic force of the push device, which achieves precise guidance by changing the path curvature of the drill bit. The time-controlled drilling mechanism improves the stability of the adjustment when approaching the target point, which can reduce the path deviation when the drill bit approaches the target point and achieve centimeter-level precise docking.

[0091] Please see the appendix Figure 1 In a preferred embodiment of the present invention, closed-loop calibration includes the following steps:

[0092] The downhole magnetic measurement module transmits measurement data to the surface system every 5 minutes. The surface system automatically calibrates the drill bit direction. By periodically transmitting downhole data, the surface system can dynamically monitor and correct changes in downhole position and direction, and automatically generate calibration instructions to ensure that the drill bit direction is consistent with the target well point.

[0093] When the measurement data deviation exceeds the preset threshold, the ground system generates a correction command to adjust the drill bit direction and the pushing force of the pushing device in real time. When the deviation exceeds the preset range, the ground system analyzes the source of error, generates a precise correction command, corrects the drill bit direction in real time, and adjusts the output parameters of the pushing device, thereby reducing the risk of deviation accumulation. It maintains high precision, especially in complex well trajectories, and ensures that the drill bit direction is always pointing towards the target point.

[0094] When the distance to the target well is less than 2 meters, the calibration frequency is increased to once per minute, and the time-controlled drilling mode is entered. The time-controlled drilling mode increases the data acquisition frequency and calibration frequency to precisely control the drill bit path, significantly reducing errors and improving the docking success rate in the critical stage of approaching the target point.

[0095] Please see the appendix Figure 1 In a preferred embodiment of the present invention, the method further includes an environmentally adaptable design step, comprising:

[0096] The multi-layer sealing design protects downhole equipment from high-pressure well fluid intrusion. The multi-layer sealing structure effectively blocks the intrusion of high-pressure well fluid through layer-by-layer protection. At the same time, the dynamic sealing ring can automatically adjust according to the pressure to adapt to complex downhole pressure changes. The multi-layer sealing design ensures the long-term stable operation of downhole equipment in high-pressure environments, reduces the risk of equipment failure caused by well fluid infiltration, and improves the reliability and durability of the equipment.

[0097] The magnetic field generating module and guiding device are manufactured using high-temperature resistant and corrosion-resistant materials. The high-temperature resistant materials improve the stability of the module by delaying the degradation of mechanical properties at high temperatures. The corrosion-resistant materials and coatings can effectively prevent the acidic and alkaline components in the well fluid from corroding the equipment. The high-temperature resistant and corrosion-resistant materials extend the service life of the downhole equipment, improve the stability of the equipment in extreme environments, and adapt to the special operating requirements of deep wells and high-temperature wells.

[0098] By applying magnetic shielding materials to the surface of key equipment, external magnetic interference is reduced. These materials efficiently absorb and shield external magnetic fields, preventing interference from geomagnetic fluctuations and magnetic field signals from other equipment in the downhole environment. This ensures the accuracy of data acquisition, improves the measurement precision and transmission stability of magnetic field signals, and guarantees the normal operation of equipment in complex downhole environments.

[0099] Please see the appendix Figure 1 In a preferred embodiment of the present invention, the pushing device has an automatic optimization function during guidance adjustment, specifically including:

[0100] The dynamic adjustment of the push-fit device's point of action adapts to different wellbore curvatures. The push-fit device consists of a hydraulic drive system, a push-fit arm, and a displacement control module. The end of the push-fit arm is designed with a spherical contact surface, which adapts to the wellbore curvature, increases the contact area, and reduces friction loss. Through the coordinated action of the hydraulic system and the displacement control module, the push-fit device adjusts the point of action in real time when the wellbore curvature changes, ensuring a uniform distribution of the push-fit force and avoiding drill bit path deviation caused by uneven force distribution.

[0101] The strength of the pushing force is adjusted according to the distance deviation between the target well and the drill bit to improve the accuracy of drill bit orientation adjustment. The magnitude of the pushing force is proportional to the distance deviation between the target well and the drill bit. By monitoring and dynamically adjusting the pushing force in real time, it is ensured that the pushing device has sufficient torque support for the adjustment of the drill bit orientation, while avoiding excessive torque that may cause path fluctuations or equipment damage. At the same time, it also reduces the orientation deviation of the drill bit and improves the docking success rate.

[0102] Please see the appendix Figure 1 In a preferred embodiment of the present invention, the method includes a dynamic adjustment mechanism in the arrangement of the downhole magnetic measurement module, comprising:

[0103] When the vertical distance between the magnetic measurement module and the target well exceeds the preset value of 20 meters, the position of the magnetic measurement module is adjusted by the coiled tubing truck. Through the coordinated work of the distance measurement sensor and the coiled tubing truck, the position of the magnetic measurement module is dynamically adjusted to keep it within a reasonable measurement range. This avoids signal attenuation and measurement errors caused by excessive distance. The mechanism of dynamically adjusting the position of the magnetic measurement module ensures that the module maintains the optimal measurement distance from the target well, improves signal strength and data accuracy, and reduces the accumulation of measurement errors.

[0104] To improve measurement accuracy and system response speed to guidance adjustments, the vertical distance between the magnetic measurement module and the target well is always kept less than 20 meters. By controlling the distance between the magnetic measurement module and the target well to less than 20 meters, the strength and resolution of the magnetic field signal are kept at their best, reducing data distortion caused by excessive distance or signal attenuation. Maintaining a reasonable measurement distance can significantly improve the resolution and stability of magnetic field data, while also improving the response speed of guidance adjustments, making the entire docking process more accurate and efficient.

[0105] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A magnetic positioning method suitable for docking wells, characterized in that, The method includes the following steps: Magnetic field generation: A rotating magnetic field with controllable intensity is generated through the downhole magnetic field generation module; Real-time magnetic field measurement: The intensity, direction, and gradient changes of the rotating magnetic field are obtained using a magnetic measurement module; Data transmission: The magnetic field data collected by the magnetic measurement module is transmitted to the ground system via electromagnetic wave signals; Data processing and location calculation: The ground system analyzes the magnetic field signal and calculates the relative position of the target well and the drill bit; Guidance adjustment: Based on the calculation results of the surface system, the magnitude and direction of the thrust of the downhole guidance device are automatically adjusted; Closed-loop calibration: Through real-time interaction between the downhole and surface systems, the relative position of the magnetic measurement module and the drill bit is periodically calibrated until the precise connection of the docking well is achieved.

2. The magnetic positioning method for docking wells according to claim 1, characterized in that, The magnetic field generation includes the following steps: A rotating magnetic field is generated using high-performance rare-earth magnets. The arrangement and shape of the magnets are optimized through finite element simulation to ensure magnetic field uniformity; A magnetic shielding structure is installed outside the downhole magnetic field generation module to shield it from external magnetic field interference.

3. The magnetic positioning method for docking wells according to claim 1, characterized in that, The real-time magnetic field measurement includes the following steps: Equipped with a triaxial magnetic field sensor to capture the direction, intensity, and gradient of the rotating magnetic field; The gradient algorithm is used to calculate the relative distance, azimuth, and inclination angle between the two wells. The magnetic measurement module incorporates a seismic-resistant design, including a hollow multi-layer structure and seismic-resistant filling material, to reduce the impact of bottom hole vibration on measurement accuracy.

4. The magnetic positioning method for docking wells according to claim 1, characterized in that, The data transmission includes the following steps: The magnetic measurement module transmits the collected magnetic field data to the ground system via narrowband electromagnetic wave signals; In long-distance transmission scenarios, multiple signal relay devices are configured, with a node placed every 1500 to 2000 meters to enhance signal strength and stability; The ground system filters the received signal to remove external interference and noise.

5. A magnetic positioning method suitable for docking wells according to claim 1, characterized in that, The data processing and location calculation include the following steps: An anti-interference filtering algorithm is used to analyze the magnetic field signal and extract the effective signal data. The relative distance between wells is calculated based on a rotating magnetic field model and a gradient inversion algorithm. By using geometric calculation methods combined with well inclination and azimuth information, the precise location of the target well can be determined.

6. A magnetic positioning method suitable for docking wells according to claim 1, characterized in that, The guidance adjustment includes the following steps: The ground system generates guidance adjustment commands, which include the magnitude and direction of the thrust force. The downhole guiding device adjusts the direction of the pushing device in real time using hydraulic drive according to the received instructions; In full rotation mode, the drill bit direction is dynamically adjusted to align it with the target point of the well.

7. A magnetic positioning method suitable for docking wells according to claim 1, characterized in that, The closed-loop calibration includes the following steps: The downhole magnetic measurement module transmits measurement data to the surface system every 5 minutes, and the surface system automatically calibrates the drill bit orientation. When the deviation of the measurement data exceeds the preset threshold, the ground system generates a correction command to adjust the drill bit direction and the pushing force of the pushing device in real time. When the distance to the target well is less than 2 meters, the calibration frequency is increased to once per minute, and the time-controlled drilling mode is entered.

8. A magnetic positioning method suitable for docking wells according to claim 1, characterized in that, The method further includes an environmentally adaptable design step, comprising: A multi-layer sealing design is adopted to protect downhole equipment and prevent high-pressure well fluid from entering; The magnetic field generating module and guiding device are manufactured using high-temperature resistant and corrosion-resistant materials; Apply magnetic shielding material to the surface of critical equipment to reduce external magnetic interference.

9. A magnetic positioning method suitable for docking wells according to claim 1, characterized in that, The pushing device has an automatic optimization function during guidance adjustment, specifically including: The position of the push-fit device's action point is dynamically adjusted to adapt to different well inclination curvatures; Adjust the pushing force based on the distance deviation between the target well and the drill bit to improve the accuracy of drill bit orientation adjustment.

10. A magnetic positioning method suitable for docking wells according to claim 1, characterized in that, The method incorporates a dynamic adjustment mechanism in the arrangement of the downhole magnetic measurement module, including: When the vertical distance between the magnetic measurement module and the target well exceeds the preset value of 20 meters, the position of the magnetic measurement module is adjusted by using a coiled tubing truck. Ensure that the vertical distance between the magnetic measurement module and the target well is always less than 20 meters to improve measurement accuracy and the system's response speed to guidance adjustments.

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