Rotating speed correcting device for steerable drilling stabilized platform
By setting magnets and Hall sensors on the outside of the shaft of the guide drilling stabilization platform to detect the rotation speed, the error problem caused by the gyroscope under vibration and temperature changes is solved, and a more accurate speed measurement and a robust control system are achieved.
Patent Information
- Application Number
- CN202421239552.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-01-10
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the guide drilling stable platform, the gyroscope drifts and errors occur during downhole vibration and temperature changes, resulting in speed measurement errors and destroying the robustness of the guide drilling control system.
A magnet is provided on the outside of the rotating shaft, and a Hall sensor is provided on the Hall ring outside it. The interaction between the magnet and the Hall sensor is used to detect the rotation speed, providing speed reference and correction for the micromechanical gyroscope signal.
It effectively eliminates the zero deviation error of the stable platform speed detection, improves the accuracy and robustness of speed measurement, and reduces the amount of temperature drift.
Smart Images
Figure CN222337212U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the fields of petroleum engineering, mechanical engineering and measurement and instrument technology, and specifically relates to a rotation speed correction device for a directional drilling stable platform. Background Art
[0002] Guided drilling is an important technology used in oil and gas exploration and development. By controlling the direction and inclination angle of the drilling tool, the well can be directional drilled toward the target oil and gas layer. In guided drilling, the stable platform speed correction device is a key technical device used to ensure that the rotation speed of the stable platform in guided drilling is accurate and reliable.
[0003] Significant progress has been made in the research and development of steerable drilling stable platform speed correction devices at home and abroad. Some advanced countries in the field of oil exploration and development abroad, such as the United States, Canada, Norway, etc., have advanced R&D and application experience in steerable drilling technology and related devices. They have relatively mature technology and products in steerable drilling stable platform speed correction devices. In China, with the continuous development of the field of oil exploration and development, steerable drilling technology has also received increasing attention. Domestic oil exploration and development companies and research institutions have also conducted certain research and applications in steerable drilling stable platform speed correction devices. Through technology introduction, independent research and development, and other methods, some steerable drilling stable platform speed correction device technologies and products with a certain level have emerged in China.
[0004] The steerable drilling stabilization platform usually uses a mechanical gyroscope or a Coriolis force MEMS gyroscope to measure the rotation speed. The gyroscope will drift and have errors under the conditions of downhole vibration and temperature changes, so the measured rotation speed will also have errors. Among them, the zero bias error is a problem that needs to be solved urgently. When the steerable drilling tool is working, the steerable drilling stabilization platform finds the corresponding direction and stabilizes to that direction. The rotation speed of the steerable drilling stabilization platform is zero at this time. However, due to the zero bias error of the gyroscope, the actual rotation speed of the drilling platform is not zero, which brings great uncertainty to the steerable drilling control and destroys the robustness of the steerable drilling control system.
[0005] Gyroscopes include mechanical gyroscopes and micromechanical (MEMS) gyroscopes. Mechanical gyroscopes rely on high-speed rotating rotors to keep their rotation axis pointing stably in inertial space. The universal brackets are composed of an inner ring, an intermediate ring, an outer ring, multiple joints and hinges, which can ensure the independent rotation of the rotor on three vertical axes. However, the rotor is driven by a brushed motor, which has a short motor life. At the same time, a very precise mechanical structure is required to ensure stable operation and accurate measurement. It is sensitive to external vibration, shock, temperature change and other interference. The internal structure of the MEMS gyroscope is a frame type. This type of micromechanical gyroscope is usually composed of one or more vibrating frames. The frame is displaced when subjected to angular velocity, thereby detecting angular velocity changes.
[0006] Since the micromechanical gyroscope is placed on the directional drilling stable platform, the outer drill collar rotates during drilling, and the stable platform needs to be relatively still in a certain direction to achieve the purpose of guidance. The gyroscope can be used to measure the rotation speed of the stable platform, but the micromechanical gyroscope is affected by temperature, vibration and its mechanical fatigue, resulting in zero bias error, which makes the stable platform unable to remain relatively still (zero rotation speed) during guidance. The error generated by the detection acts on the control system, resulting in failure of the directional drilling control. Summary of the invention
[0007] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the utility model is to provide a speed correction device for a directional drilling stable platform. By arranging a magnet on the copper ring outside the rotating shaft and a Hall sensor on the Hall ring outside the copper ring, the magnet and the Hall sensor interact with each other, and the magnet is used for position detection. The rotation speed of the stable platform can be detected, and a speed reference and correction can be provided for the micromechanical gyroscope signal. The utility model has the technical effect of small temperature drift and eliminating the zero bias error of the stable platform speed detection.
[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0009] A rotation speed correction device for a directional drilling stabilization platform comprises a shell 15, a rotor 10 and a rotating shaft 16 are arranged at the center of the shell 15, the rotating shaft 16 vertically passes through the rotor 10 and is fixedly connected to the rotor 10; the N pole and the S pole of the magnetic field are respectively arranged at the two ends of the rotor 10; the two ends of the rotating shaft 16 are respectively connected to the external copper ring 3 through mechanical bearings 12, and the outside of the copper ring 3 is provided with magnets 11 corresponding to the two ends of the rotating shaft 16, and two suspension columns 6 are fixed on the upper and lower surfaces inside the shell 15 and on the opposite sides of the outside of the copper ring 3, and the copper ring 3 is connected to the suspension column 6 through the mechanical bearing 12, and the outside of the copper ring 3 is provided with a Hall ring 7 fixed to the inner wall of the shell 15.
[0010] The Hall ring 7 is provided with a plurality of Hall sensors 5 . The Hall ring 7 is connected to a connector 17 fixed to a side wall of the housing 15 . The Hall ring wire 1 of the Hall ring 7 is connected to the circuit board 2 at the bottom along the housing 15 .
[0011] An excitation coil core 8 and an excitation coil 14 are respectively disposed at the outer centers of the two suspension columns 6 , and an excitation coil conductor 9 of the excitation coil 14 is connected to the circuit board 2 located at the bottom of the housing 15 .
[0012] An interface 13 connected to the circuit board 2 is provided at the outer bottom of the shell 15. The circuit board 2 has a built-in Hall sensor 5 signal amplifier, an excitation coil 14 excitation circuit and a filter circuit. The signal output ends of the Hall sensor 5 and the excitation coil 14 are connected to the signal input end of the signal amplifier built into the circuit board 2, the signal output end of the signal amplifier is connected to the signal input end of the filter circuit, and the signal output end of the filter circuit is connected to the interface 13.
[0013] Mounting seats 4 for fixing the housing 15 are respectively installed on both sides of the bottom of the outer side of the housing 15 .
[0014] The gap between the Hall ring 7 and the magnet 11 is 1-3 mm.
[0015] Compared with the prior art, the beneficial effects of the utility model are:
[0016] 1. The magnet 11 at the top of the rotating shaft 16 of the utility model works with the Hall sensor 5 on the Hall ring 7 to obtain the position signal, and the fixed axis property of the rotor 10 is used to measure the position change of the rotating shaft 16 and then measure the speed, thus forming a new speed detection device. Since the rotating shaft has a fixed axis property, the top position of the rotating shaft can be detected, and a certain signal can be output at each position, without measurement error and speed zero bias error.
[0017] 2. The utility model generates an alternating electromagnetic field through the excitation coil 14 to drive the rotor 10 to rotate. The non-contact driving method can eliminate the iron loss and other losses and many unstable factors caused by the contact between the rotor of the traditional sensor and the power supply electrode.
[0018] 3. The utility model adopts a double-degree-of-freedom rotating shaft 16. While the rotating shaft 16 rotates in the same direction as the rotor 10, it can rotate in a direction perpendicular to the center of the rotor 10, ensuring that the rotating shaft 16 can remain constant when the speed correction housing 15 rotates with the stable platform, thereby ensuring the accuracy of the speed measurement.
[0019] In summary, the utility model arranges a magnet 11 on the copper ring 3 outside the rotating shaft 16, and arranges a Hall sensor 5 on the Hall ring 7 outside the copper ring 3. The magnet 11 interacts with the Hall sensor 5, and the magnet 11 is used for position detection. The rotation speed of the stable platform can be detected, and a speed reference and correction can be provided for the micromechanical gyroscope signal. The utility model has the effect of small temperature drift and eliminating the zero bias error of the stable platform speed detection. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is an oblique perspective view of the utility model.
[0021] Figure 2 It is a front sectional view of the utility model.
[0022] Figure 3 It is a side sectional view of the utility model.
[0023] Figure 4 It is a partial enlarged view of the utility model.
[0024] Figure 5 It is the external structure diagram of the utility model.
[0025] Among them, 1. Hall ring wire; 2. circuit board; 3. copper ring; 4. mounting base; 5. Hall sensor; 6. suspension column; 7. Hall ring; 8. excitation coil core; 9. excitation coil wire; 10. rotor; 11. magnet; 12. mechanical bearing; 13. interface; 14. excitation coil; 15. housing; 16. shaft; 17. connector. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] like Figure 1As shown, the utility model provides a rotation speed correction device for a directional drilling stable platform, comprising a shell 15, a rotor 10 and a rotating shaft 16 are arranged at the center of the shell 15, the rotating shaft 16 vertically passes through the rotor 10 and is fixedly connected to the rotor 10; the material of the rotor 10 is a permanent magnet, which has magnetism, and the two ends of the rotor 10 are respectively provided with an N pole and an S pole of a magnetic field; the two ends of the rotating shaft 16 are respectively connected to an external copper ring 3 through a mechanical bearing 12, and the rotating shaft 16 and the copper ring 3 can rotate relative to each other; a magnet 11 corresponding to the two ends of the rotating shaft 16 is arranged on the outside of the copper ring 3, two suspension columns 6 are fixed on the upper and lower surfaces inside the shell 15 and on the opposite sides of the outside of the copper ring 3, the copper ring 3 and the suspension column 6 are connected through the mechanical bearing 12, so that the copper ring 3 and the suspension column 6 can rotate relative to each other, and a Hall ring 7 fixed to the inner wall of the shell 15 is arranged on the outside of the copper ring 3.
[0028] like Figure 2 As shown, the rotor 10 has an N pole on the left side and an S pole on the right side in the X-axis direction, and can rotate counterclockwise under the action of the excitation coil 14. The copper ring 3 and the suspension column 6 are connected in the X-axis direction through a mechanical bearing 12.
[0029] like Figure 3 As shown, the suspension column 6 is connected to the housing 15 and fixed up and down; the four points of the upper, lower, left and right of the Hall ring 7 are connected to the four surfaces of the housing 15 and fixed; the lead-out part of the excitation coil wire 9 of the excitation coil 14 is laid on the outside of the suspension column 6.
[0030] The Hall ring 7 is provided with a plurality of Hall sensors 5 . The Hall ring 7 is connected to a connector 17 fixed to a side wall of the housing 15 . The Hall ring wire 1 of the Hall ring 7 is connected to the circuit board 2 at the bottom along the housing 15 .
[0031] like Figure 4 As shown, the rotating shaft 16 of the rotor 10 is connected to the copper ring 3 in the Y-axis direction by a mechanical bearing 12, a magnet 11 is installed on the outside of the copper ring 3 in the Y-axis direction, the outer black and white ring is a Hall ring 7 equipped with a Hall sensor 5, and the Hall ring 7 is equipped with a Hall sensor 5 in each black area, and the Hall sensor 5 is connected to the circuit board 2 at the bottom of the sensor through the inner circuit of the Hall ring 7.
[0032] Correction principle: the magnet 11 on the copper ring 3 outside the rotating shaft 16 can interact with the Hall sensor 5 installed in the black area of the outer black and white ring (Hall ring 7), and the Hall sensor 5 at the corresponding position of the Hall ring 7 and the magnet 11 will have a signal output, so that the position and relative displacement speed of the axis can be detected in real time; once the rotor 10 starts to rotate, the direction of the rotating shaft axis will not change, and this axis can be used as a reference for calculating the rotation speed of the directional drilling stable platform.
[0033] An excitation coil core 8 and an excitation coil 14 are respectively disposed at the outer centers of the two suspension columns 6 . An excitation coil conductor 9 of the excitation coil 14 is placed at the center of the suspension column 6 and connected to the circuit board 2 located at the bottom of the housing 15 .
[0034] An interface 13 connected to the circuit board 2 is provided at the outer bottom of the shell 15. The circuit board 2 has a built-in Hall sensor 5 signal amplifier, an excitation coil 14 excitation circuit and a filter circuit. The signal output ends of the Hall sensor 5 and the excitation coil 14 are connected to the signal input end of the signal amplifier built into the circuit board 2, the signal output end of the signal amplifier is connected to the signal input end of the filter circuit, and the signal output end of the filter circuit is connected to the interface 13.
[0035] The circuit board 2 has built-in Hall sensor 5 signal amplifier, excitation coil 14 excitation circuit, filtering circuit, etc.; the power supply of the Hall sensor 5 is connected to the connector 17, and then connected to the circuit board 2 by the connector 17, and then connected to the interface 13; the power supply of the excitation coil 14 is connected to the circuit board 2 and then connected to the interface 13, and the signal lead wires of the Hall sensor 5 and the excitation coil 14 are connected to the signal amplifier of the bottom circuit board 2, and the signal amplified by the signal amplifier is output to the filtering circuit, and the amplified and filtered signal is connected to the interface 13, and then exported to the processor by the interface 13 for signal analysis and processing.
[0036] Mounting seats 4 for fixing the housing 15 are respectively installed on both sides of the bottom of the outer side of the housing 15 .
[0037] The gap between the Hall ring 7 and the magnet 11 is 1-3 mm.
[0038] The Hall ring conductor 1 is used for power and signal transmission of the Hall sensor 5; the circuit board 2 is used for power transmission and signal processing; the copper ring 3 is used to fix the rotating shaft 16 and the magnet 11; the mounting seat 4 is used to fix the housing 15; the Hall sensor 5 is used to detect the position of the copper ring 3; the suspension column 6 is used to install the excitation coil 14 and fix the copper ring 3; the Hall ring 7 is used to fix the Hall sensor 5; the excitation coil core 8 is used to enhance the electromagnetic signal; the excitation coil conductor 9 is used to conduct current; the rotor 10 is used to generate rotational inertia, and its axial stability can be used for speed detection; the magnet 11 is used to act with the Hall sensor 5 to detect the speed; the mechanical bearing 12 is used for the free rotation of the rotor 10 and the copper ring 3; the interface 13 is used to connect the circuit; the excitation coil 14 is used to generate an alternating magnetic field to rotate the rotor 10; the housing 15 is used to protect and fix the speed correction device; the rotating shaft 16 is used to connect the rotor 10 and the copper ring 3; the connector 17 is used to integrate and connect the circuits of each Hall sensor 5.
[0039] like Figure 5As shown, a circuit lead-out interface 13 is provided on the housing 15, and a pair of square metal mounting seats 4 are provided at the bottom of the housing 15 for fixing the directional drilling stable platform rotation speed correction device on the directional drilling stable platform.
[0040] The working principle of the utility model is:
[0041] By using the inertia principle of the gyroscope, the traditional gyroscope is improved, the outer shell 15 is fixed, and the Hall sensor 5 is installed on the Hall ring 7. The Hall sensor 5 on the Hall ring 7 of the outer ring can detect the position of the magnet 11 on the copper ring 3 of the inner ring. Since the copper ring 3 is connected to the rotating shaft 16 of the rotor 10 through the mechanical bearing 12 on the Y coordinate axis, and the copper ring 3 is connected to the inner side of the suspension column 6 through the mechanical bearing 12 in the X axis direction, the copper ring 3 will rotate with the X axis as the axis. Since the internal rotor 10 has a gyro effect, the copper ring 3 remains constant after the rotor 10 rotates. At this time, if the speed correction shell 15 of the steered drilling stable platform rotates, the Hall sensor 5 will detect the relative rotation of the shell 15 and the copper ring 3, thereby outputting a position and displacement signal. By fusing it into the speed measurement signal of the steered drilling tool stable platform, the zero bias error of the steered drilling stable platform can be corrected, and it can also assist in measuring the speed of the steered drilling stable platform.
[0042] Since the rotating shaft 16 of the internal rotor 10 will not deflect under the gyroscopic effect of the rotor 10, the copper ring 3 connected to the rotating shaft 16 will not deflect either, and can be used as a reliable reference for detecting the position and rotation speed of the stable platform. The signal will not have zero bias error and temperature drift, and the problem of failure of accelerometer correction of zero bias error during vertical drilling and high-angle drilling of the directional drilling platform can be eliminated. When the inclination of the directional drilling stable platform is within the range of ±90o, the rotation speed of the directional drilling stable platform at low speed can be stably and accurately measured to correct the zero bias error of the micromechanical gyroscope.
Claims
1. A rotation speed correction device for a directional drilling stabilization platform, characterized in that: The invention comprises a housing (15), wherein a rotor (10) and a rotating shaft (16) are arranged at the center of the housing (15), wherein the rotating shaft (16) vertically passes through the rotor (10) and is fixedly connected to the rotor (10); the N pole and the S pole of the magnetic field are respectively arranged at the two ends of the rotor (10); the two ends of the rotating shaft (16) are respectively connected to an external copper ring (3) through a mechanical bearing (12), and the outside of the copper ring (3) is provided with magnets (11) corresponding to the two ends of the rotating shaft (16); two suspension columns (6) are fixed on the upper and lower surfaces inside the housing (15) and located on opposite sides of the outside of the copper ring (3); the copper ring (3) and the suspension column (6) are connected through the mechanical bearing (12), and the outside of the copper ring (3) is provided with a Hall ring (7) fixed to the inner wall of the housing (15).
2. The rotation speed correction device for a directional drilling stable platform according to claim 1, characterized in that: The Hall ring (7) is provided with a plurality of Hall sensors (5), the Hall ring (7) is connected to a connector (17) fixed to a side wall of the housing (15), and a Hall ring wire (1) of the Hall ring (7) is connected to a circuit board (2) at the bottom along the housing (15).
3. The rotation speed correction device for a directional drilling stable platform according to claim 1, characterized in that: An excitation coil core (8) and an excitation coil (14) are respectively provided at the outer centers of the two suspension columns (6), and an excitation coil conductor (9) of the excitation coil (14) is connected to a circuit board (2) located at the bottom of the housing (15).
4. A rotation speed correction device for a directional drilling stable platform according to claim 1 or 2, characterized in that: An interface (13) connected to the circuit board (2) is provided at the outer bottom of the housing (15); the circuit board (2) has built-in Hall sensor (5) signal amplifier, excitation coil (14) excitation circuit and filter circuit; the signal output ends of the Hall sensor (5) and the excitation coil (14) are connected to the signal input end of the signal amplifier built into the circuit board (2); the signal output end of the signal amplifier is connected to the signal input end of the filter circuit; and the signal output end of the filter circuit is connected to the interface (13).
5. A rotation speed correction device for a directional drilling stable platform according to claim 1 or 2, characterized in that: Mounting seats (4) for fixing the outer shell (15) are respectively installed on both sides of the bottom of the outer shell (15).
6. A rotation speed correction device for a directional drilling stable platform according to claim 1 or 2, characterized in that: The gap between the Hall ring (7) and the magnet (11) is 1-3 mm.