Measurement-while-drilling rotary pulser transmission device for underground high pressure and use method of measurement-while-drilling rotary pulser transmission device

Abstract

The invention provides an underground high-pressure measurement-while-drilling rotary pulser transmission device and a using method, the underground high-pressure measurement-while-drilling rotary pulser transmission device comprises an external pressure-bearing structure, the external pressure-bearing structure comprises a speed reducer compression-resistant cylinder and a driver compression-resistant cylinder, and one end of the speed reducer compression-resistant cylinder is connected with one end of the driver compression-resistant cylinder; the circuit board framework mechanism, the motor mechanism and the flexible coupler are installed in the driver compression-resistant cylinder, the speed reducer and the magnetism isolating mechanism are installed in the speed reducer compression-resistant cylinder, one end of the speed reducer is connected with one end of the magnetism isolating mechanism, the other end of the magnetism isolating mechanism is connected with one end of the motor mechanism, and the other end of the motor mechanism is connected with one end of the flexible coupler. The other end of the flexible coupling is connected with one end of the circuit board framework mechanism. It can be guaranteed that the motor is always in a safe static pressure working interval, stable rotation of the rotary pulser can be guaranteed, accurate generation and transmission of pressure pulse signals are guaranteed, well drilling technicians can know underground working condition parameters in time, and the well drilling operation efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of oil drilling engineering technology, specifically to the transmission device and method of a rotary pulse generator for downhole high-pressure measurement while drilling. Background Technology

[0002] With the continuous development of large oilfields, drilling depths are increasing, formation conditions are becoming more complex, and the number of easily exploitable oil and gas layers is decreasing. To optimize wellhead location layout, the number of deep wells is increasing year by year. During deep well drilling and production, the bottom hole circulating temperature generally exceeds 175℃, and the bottom hole pressure exceeds 150MPa, which places higher demands on the operational stability of measurement-while-drilling (MWD) instruments. Among these, the rotary pulse generator, as a crucial structure in the MWD system for controlling the flow into the bottom hole, has a transmission device whose operational stability directly affects the speed and accuracy of well condition signal transmission.

[0003] As drilling depths continue to increase, rotary pulsers face the high pressure, strong impacts, and complex chemical environments of deep well operations, placing higher demands on the stability of their transmission mechanisms. Furthermore, in deep well environments, the transmission mechanisms in rotary pulsers must withstand higher static pressures, requiring greater structural strength. Currently, the transmission devices in rotary pulse generators mainly include servo systems, hydraulic transmission systems, and pneumatic transmission systems. These systems are directly installed inside the mounting cylinder. Since the mounting cylinder has limited pressure resistance, a pressure-bearing sleeve is often added to the outside of the mounting cylinder to increase the strength of the transmission device. The pressure-bearing sleeve and the mounting cylinder cooperate to form a casing that can withstand the high pressure in deep wells. However, in the deep well operation environment, the high pressure and high temperature environment will cause the casing of the transmission device to be subjected to increased stress and thermal deformation, which will cause the transmission shaft to deform. This will result in insufficient strength of the transmission device, leading to problems such as increased equipment noise and decreased measurement accuracy. Moreover, the high sulfur environment will exacerbate the corrosion of the casing, further reducing the strength of the casing. Therefore, the mechanical impact and vibration during drilling under high pressure, high temperature, and high sulfur are more obvious, causing the transmission device of the rotary pulse generator to jam in the deep well environment, resulting in the rotary pulse generator being unable to operate continuously and stably in deep wells. Summary of the Invention

[0004] To address the problem that the transmission device of existing rotary pulsers experiences reduced casing strength in deep well environments, leading to jamming of the internal structure and resulting in unstable and continuous operation of the rotary pulser, this invention provides a transmission device and method for a rotary pulser used for downhole high-pressure measurement while drilling.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention proposes a rotary pulse generator transmission device for downhole high-pressure measurement while drilling, comprising an external pressure-bearing structure, a circuit board frame mechanism, a motor mechanism, a flexible coupling, a magnetic shielding mechanism, and a reducer; The external pressure-bearing structure includes a reducer pressure-resistant cylinder and a driver pressure-resistant cylinder, with one end of the reducer pressure-resistant cylinder connected to one end of the driver pressure-resistant cylinder; The circuit board frame mechanism, the motor mechanism, and the flexible coupling are installed inside the driver pressure-resistant cylinder. The reducer and the magnetic shielding mechanism are installed inside the reducer pressure-resistant cylinder. One end of the reducer is connected to one end of the magnetic shielding mechanism, the other end of the magnetic shielding mechanism is connected to one end of the motor mechanism, the other end of the motor mechanism is connected to one end of the flexible coupling, and the other end of the flexible coupling is connected to one end of the circuit board frame mechanism. The magnetic shielding mechanism includes a magnetic shielding shell, an inner magnet, and an outer magnet. The magnetic shielding shell is installed inside the pressure-resistant cylinder of the reducer, and one end of the magnetic shielding shell is connected to the reducer, while the other end of the magnetic shielding shell is connected to the outer magnet. The inner magnet is installed inside the magnetic shielding shell. During operation, the inner magnet rotates and cuts the magnetic field of the outer magnet to generate a magnetic field signal.

[0006] Preferably, a first trapezoidal groove is provided at the end of the reducer pressure-resistant cylinder, and a trapezoidal platform is provided at the end of the driver pressure-resistant cylinder. The trapezoidal platform is installed in the first trapezoidal groove, and the reducer pressure-resistant cylinder and the driver pressure-resistant cylinder are connected to form a cylindrical cylinder.

[0007] Preferably, an annular groove is provided on the trapezoidal platform, and a first sealing ring is installed in the annular groove, with the outer wall of the first sealing ring fitting against the inner wall of the first trapezoidal groove.

[0008] Preferably, an annular sealing groove is provided on the outer wall of the magnetic shielding shell, and a second sealing ring is installed in the annular sealing groove, with the outer wall of the second sealing ring fitting against the inner wall of the reducer pressure cylinder.

[0009] Preferably, the circuit board skeleton mechanism includes a circuit board skeleton, a driver expansion ring, and a driver plug. The circuit board skeleton is installed inside the driver pressure-resistant cylinder. One end of the circuit board skeleton is connected to the motor mechanism, and the other end of the circuit board skeleton is connected to the driver plug. The driver expansion ring is installed between the circuit board skeleton and the driver plug.

[0010] Preferably, the circuit board frame includes a mounting bracket, a first connecting block is provided on one end of the mounting bracket, and a second connecting block is provided on the other end of the mounting bracket. The first connecting block is connected to the driver plug, and the second connecting block is connected to the motor mechanism. The outer wall of the second connecting block is provided with an annular mounting groove, and a rigid annular pad is installed in the annular mounting groove.

[0011] Preferably, the rigid annular pad is made of one or more of the following materials: nickel-based alloy, ceramic, aluminum silicate fiber, graphite, and porous polypropylene foam.

[0012] Preferably, a U-shaped groove is provided at each of the two ends of the mounting bracket, and a buffer block is installed in the U-shaped groove.

[0013] Preferably, the motor mechanism includes a motor, a motor vibration isolation sleeve, and a motor connector. The motor vibration isolation sleeve is installed inside the driver pressure-resistant cylinder. The motor is installed inside the motor vibration isolation sleeve. The output shaft of the motor is connected to the flexible coupling. The motor connector is installed on the end of the motor away from the flexible coupling. The motor connector is connected to the end of the circuit board frame away from the driver plug.

[0014] This invention proposes a method for using a rotary pulse generator drive device for downhole high-pressure measurement while drilling, comprising the following steps: Step 1: The electronic components on the circuit board skeleton receive control signals from the ground control center and convert the control signals into PWM wave signals to control the rotation of the motor. Step 2: The motor mechanism acquires a PWM wave signal to operate, driving the flexible coupling to rotate. The flexible coupling drives the inner magnet to rotate, and the rotating inner magnet cuts the outer magnet to generate a magnetic field signal. Step 3: The electronic components on the circuit board frame receive the magnetic field signal and transmit it to the ground control center.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: This invention proposes a rotary pulse generator transmission device for downhole high-pressure measurement while drilling (MSD). The tight connection between the external pressure-bearing structure, the reducer's pressure-resistant cylinder, and the driver's pressure-resistant cylinder ensures the stability and reliability of the entire transmission device in the downhole high-pressure environment, improves the device's pressure resistance, and provides robust protection for its internal components, effectively extending the equipment's service life. The circuit board frame mechanism, motor mechanism, flexible coupling, and reducer make the entire transmission system's operation smoother and energy transfer more efficient. The motor mechanism is connected to the circuit board frame mechanism via the flexible coupling, achieving smooth power transmission while reducing energy loss due to vibration and impact. The reducer further regulates the motor's output speed, meeting the precise speed control requirements during MSD. The ingeniously designed magnetic shielding mechanism generates a magnetic field signal by rotating an inner magnet that cuts the magnetic field of an outer magnet, achieving non-contact signal transmission. This not only improves the stability and accuracy of signal transmission but also avoids the wear and malfunctions that may exist in traditional contact transmission methods. The presence of the magnetic shielding mechanism effectively isolates the magnetic field generated by the motor from interfering with the electronic components in the circuit board skeleton, ensuring the normal operation of the entire system. This allows the transmission device of the present invention to maintain stable and efficient operation even under high pressure, strong impact, and complex chemical environments, maximizing the accuracy of the rotary pulse generator signal transmission and reception, and ensuring the efficient conduct of well logging work. Compared with traditional transmission devices, its advantages are mainly that the connection between the reducer pressure cylinder and the driver pressure cylinder in the external pressure-bearing mechanism can increase the connection stability and sealing of the pressure-bearing structure, maximizing the protection of the transmission device in a suitable static pressure environment; the use of a flexible coupling reduces the speed fluctuation of the motor under strong impact environments, thereby ensuring the generation accuracy of the pressure pulse signal; and the magnetic shielding mechanism reduces the influence of the magnetic field generated by the motor rotation on the pulse signal, maximizing the encoding accuracy of the pressure pulse signal. Thus, this transmission device can ensure the operational stability of the transmission system and isolate the influence of the motor magnetic field on the pulse signal, thereby ensuring the testing accuracy of the rotary pulse generator.

[0016] Furthermore, this transmission device, by setting a first trapezoidal groove at the end of the reducer's pressure-resistant cylinder and a trapezoidal platform at the end of the driver's pressure-resistant cylinder, and then installing the trapezoidal platform into the first trapezoidal groove, achieves an effective connection between the reducer's pressure-resistant cylinder and the driver's pressure-resistant cylinder, forming an integral cylindrical cylinder. This enhances the structural stability and pressure resistance. The tight and firm fit between the trapezoidal groove and the trapezoidal platform effectively resists pressure from all directions, ensuring the stable operation of the entire system under high pressure. This simplifies the installation process and improves work efficiency. Traditional connection methods may require complex assembly steps and additional fasteners, while this transmission device, through the direct fit between the trapezoidal groove and the trapezoidal platform, simplifies the assembly process, reduces installation time and cost. The tight fit between the trapezoidal groove and the trapezoidal platform effectively prevents liquid or gas leakage, ensuring that the internal medium of the system does not leak out, thereby guaranteeing the safety and reliability of the system. By setting the first trapezoidal groove and the trapezoidal platform at the ends of the reducer's pressure-resistant cylinder and the driver's pressure-resistant cylinder respectively, and achieving their tight fit, not only is the stability and pressure resistance of the system improved and the installation process simplified, but the sealing performance of the system is also enhanced.

[0017] Furthermore, this transmission device features an annular groove on a trapezoidal platform, within which a first sealing ring is installed. This ensures the outer wall of the first sealing ring fits tightly against the inner wall of the trapezoidal groove, enhancing the sealing performance at the connection between the reducer's pressure-resistant cylinder and the driver's pressure-resistant cylinder. The addition of the first sealing ring effectively prevents liquid or gas leakage under high-pressure conditions, ensuring a dry and clean working environment inside the transmission device. This helps maintain the normal operation of internal components, reduces performance degradation or failure risks caused by leakage, and improves the reliability and durability of the entire system under extreme environments. In addition, the use of the first sealing ring reduces reliance on additional fasteners, simplifies the assembly process, and improves production efficiency and cost-effectiveness.

[0018] Furthermore, this transmission device features an annular sealing groove on the outer wall of the magnetic shielding housing, and a second sealing ring is installed within this groove. This ensures that the outer wall of the second sealing ring fits tightly against the inner wall of the reducer's pressure-resistant cylinder, significantly improving the sealing effect between the magnetic shielding mechanism and the reducer's pressure-resistant cylinder. The addition of the second sealing ring effectively prevents the penetration of media (such as liquids or gases) under high pressure, ensuring the stability and purity of the magnetic field inside the magnetic shielding mechanism. This is crucial for improving the accuracy and reliability of magnetic field signal transmission. The excellent sealing performance also protects the magnetic shielding mechanism from external environmental corrosion, extending the equipment's service life. By using a second sealing ring, the assembly process is simplified, and maintenance costs caused by poor sealing are reduced.

[0019] Furthermore, the circuit board skeleton, serving as the core support structure, is securely installed within the driver's pressure-resistant cylinder. This not only provides a solid mounting platform for the circuit board but also ensures the stable operation of circuit components under high-pressure conditions. One end of the circuit board skeleton is tightly connected to the motor mechanism, enabling efficient power transmission and accurate signal reception, providing reliable data support for drilling measurements. The driver plug enhances the overall structural strength of the circuit board skeleton mechanism and also provides a good seal, effectively preventing media leakage under high-pressure conditions and ensuring a dry and clean internal environment. The presence of the driver plug also provides additional protection for the circuit board skeleton mechanism, reducing the risk of damage caused by external impacts or vibrations. The driver expansion ring improves the stability and reliability of the circuit board skeleton mechanism. Installed between the circuit board skeleton and the driver plug, the driver expansion ring, through its unique tensioning action, ensures a tight fit between the circuit board skeleton and the driver's pressure-resistant cylinder, effectively preventing performance degradation or failure risks caused by loosening or displacement. This improves the overall performance of the transmission device and provides strong support for the long-term stable operation of the equipment, reducing the impact of strong impact environments on the transmission system and ensuring the stable operation of the motor.

[0020] Furthermore, the circuit board frame in this transmission device includes a mounting bracket, a first connecting block, a second connecting block, an annular mounting groove, and a rigid annular pad. The mounting bracket, as the main structure of the circuit board frame, provides a stable support platform for the circuit board, ensuring the normal operation of the circuit components in complex environments. The first and second connecting blocks are located at opposite ends of the mounting bracket, connecting the circuit board frame to other components and optimizing the force transmission path, thus improving the overall stability and reliability of the structure. The connection between the first connecting block and the driver plug effectively fixes the circuit board frame mechanism to the driver's anti-pressure cylinder, enhancing the overall rigidity of the system and reducing the impact of vibration or... The performance fluctuations caused by impact are mitigated by the precise fit and stable force transmission between the second connecting block and the motor mechanism, ensuring that the power output of the motor can be efficiently transmitted to the circuit board frame, thereby achieving precise control of measurement while drilling. The annular mounting groove on the outer wall of the second connecting block and its internal rigid annular pad enhance the connection strength between the circuit board frame and the motor mechanism. The addition of the rigid annular pad not only increases the stability of the contact and effectively disperses the stress at the connection, avoiding the risk of damage caused by stress concentration, but also improves the durability of the circuit board frame mechanism and provides a solid guarantee for the stable operation of the entire transmission device in the high-pressure environment downhole.

[0021] Furthermore, the motor mechanism in this transmission device includes a motor, a motor vibration isolation sleeve, and a motor connector. The motor is installed inside the motor vibration isolation sleeve, which provides excellent protection and support for the motor. The vibration isolation sleeve also effectively reduces vibration and noise generated during motor operation, improving the stability and reliability of the entire transmission device. The motor's output shaft is directly connected to a flexible coupling, achieving smooth power transmission and precise control. The flexible coupling can absorb and compensate for axial, radial, and angular deviations caused by installation errors, temperature changes, or load variations, thus ensuring the stability and durability of the connection between the motor and the circuit board frame. The motor connector enables electrical connection and data transmission between the motor and the circuit board frame. The motor connector not only has excellent conductivity and signal transmission capabilities but also, through its unique design, ensures the robustness and reliability of the connection between the motor and the circuit board frame, simplifying the assembly process, reducing maintenance costs, and significantly improving the power transmission efficiency, vibration control capability, and electrical connection stability of the transmission device.

[0022] This invention proposes a method for using a rotary pulse generator drive device for downhole high-pressure measurement while drilling. This method utilizes electronic components on a circuit board frame mechanism to receive control signals from a surface control center. These signals are processed and converted into PWM wave signals to control the motor's rotation, ensuring accurate transmission of control commands. Upon receiving the PWM wave signal, the motor mechanism begins operation, with its output shaft driving a flexible coupling. The flexible coupling, with its excellent elasticity and compensation capabilities, effectively transmits the motor's power and ensures smooth and precise rotation. As the flexible coupling rotates, the inner magnet also rotates, cutting the magnetic field of the outer magnet to generate a magnetic field signal. This achieves non-contact signal transmission and improves signal transmission stability and anti-interference capabilities. The electronic components on the circuit board frame mechanism again play a role, receiving and processing the magnetic field signal generated by the rotation of the inner magnet, and then transmitting these signals to the surface control center. This enables real-time uploading of downhole data, providing the surface control center with accurate and timely downhole information, facilitating precise monitoring and adjustment of the drilling process. Therefore, the method proposed in this invention achieves remote and precise control of downhole equipment and real-time data transmission, significantly improving the efficiency and accuracy of measurement while drilling. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the rotary pulse generator transmission device for downhole high pressure measurement while drilling proposed in this invention. Figure 2 This is a schematic diagram of the external pressure-bearing structure in the rotary pulse generator drive device for downhole high pressure proposed in this invention. Figure 3This is a schematic diagram of the circuit board skeleton mechanism in the rotary pulse generator transmission device for downhole high pressure measurement while drilling proposed in this invention. Figure 4 This is a schematic diagram of the motor mechanism in the rotary pulse generator drive device for downhole high pressure measurement proposed in this invention. Figure 5 This is a schematic diagram of the magnetic isolation mechanism in the rotary pulse generator transmission device for downhole high pressure measurement proposed in this invention. In the attached diagram: 1. Reducer pressure-resistant cylinder; 2. Reducer; 3. Input shaft cover plate; 4. Gasket; 5. Magnetic shielding shell; 6. Inner magnet; 7. Outer magnet; 8. Flexible coupling; 9. Driver pressure-resistant cylinder; 10. Motor; 11. Motor vibration isolation sleeve; 12. Motor connector; 13. Circuit board frame; 14. Driver expansion ring; 15. Driver plug; 16. U-groove. Detailed Implementation

[0024] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0025] 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 do not 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.

[0026] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] 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 communication connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0030] like Figures 1-5 As shown, this invention proposes a rotary pulse generator transmission device for downhole high-pressure measurement while drilling, comprising an external pressure-bearing structure, a circuit board frame mechanism, a motor mechanism, a flexible coupling 8, a magnetic isolation mechanism, and a reducer 2. The circuit board frame mechanism, motor mechanism, flexible coupling 8, magnetic isolation mechanism, and reducer 2 are all installed on the external pressure-bearing structure, and the reducer structure, magnetic isolation mechanism, flexible coupling 8, motor mechanism, and circuit board frame mechanism are installed sequentially from the left end to the right end inside the external pressure-bearing structure. One end of the reducer 2 is connected to one end of the magnetic isolation mechanism, the other end of the magnetic isolation mechanism is connected to one end of the motor mechanism, the other end of the motor mechanism is connected to one end of the flexible coupling 8, and the other end of the flexible coupling 8 is connected to one end of the circuit board frame mechanism.

[0031] like Figure 2As shown, the external pressure-bearing structure includes a reducer pressure-bearing cylinder 1 and a driver pressure-bearing cylinder 9. A first trapezoidal groove is provided on the right end of the reducer pressure-bearing cylinder 1, and a trapezoidal platform is provided on the outer wall of the left end of the driver pressure-bearing cylinder 9. The trapezoidal platform is installed within the first trapezoidal groove. The right end of the reducer pressure-bearing cylinder 1 and the left end of the driver pressure-bearing cylinder 9 are connected together through the cooperation of the first trapezoidal groove and the trapezoidal platform, forming a cylindrical cylinder. An annular groove is provided on the outer wall of the trapezoidal platform at the left end of the driver pressure-bearing cylinder 9, and a first... A sealing ring is provided, with its outer wall fitting against the inner wall of the first trapezoidal groove on the right end of the reducer pressure-resistant cylinder 1, sealing the first trapezoidal groove and trapezoidal platform to increase the sealing performance of the transmission device. A rectangular sealing groove is provided on the right end face of the driver pressure-resistant cylinder 9 to place the sealing ring. Other components are connected through the rectangular sealing groove to increase the sealing performance of the external pressure-bearing structure in the deep well formation and ensure the stability of the internal structure operation. The circuit board frame mechanism, motor mechanism, and flexible coupling 8 are installed inside the driver pressure-resistant cylinder 9, and the reducer 2 and magnetic shielding mechanism are installed inside the reducer pressure-resistant cylinder 1.

[0032] Preferably, a ceramic inner liner is installed on the inner wall of the driver pressure-resistant cylinder 9 to increase the strength of the driver pressure-resistant cylinder 9.

[0033] like Figure 1 and Figure 3As shown, the circuit board frame mechanism includes a circuit board frame 13, a driver expansion ring 14, and a driver plug 15. The circuit board frame 13 is installed inside the driver pressure-resistant cylinder 9. The circuit board frame includes a mounting bracket with a first connecting block at one end and a second connecting block at the other end. The driver expansion ring 14 is connected to the right end face of the first connecting block. The driver expansion ring 14 is wedge-shaped, with its outer wall fitting against the inner wall of the driver pressure-resistant cylinder 9. The inner wall of the driver expansion ring 14 is fixed to the right end face of the circuit board frame 13. The driver expansion ring 14 increases the reliability of the connection between the circuit board frame 13 and the driver pressure-resistant cylinder 9, ensuring that the circuit board frame 13 is always in a state of small-amplitude vibration. The driver expansion ring 14 is installed inside the driver pressure-resistant cylinder 9 at a position fitting against the right side face of the driver expansion ring 14. A drive plug 15 is provided to prevent bottom fluid from flowing into the circuit board frame 13 and damaging the electronic components installed on the circuit board frame 13, thus ensuring the stability of the transmission device in the deep well. The left end of the second connecting block is connected to the motor mechanism. The outer wall of the second connecting block is attached to the inner wall of the drive pressure cylinder 9. The outer wall of the second connecting block is provided with a first annular mounting groove and a second annular mounting groove. The first annular mounting groove is located on the side of the second annular mounting groove and close to the mounting frame. Rigid annular pads are installed in the first annular mounting groove and the second annular mounting groove, respectively. The rigid annular pads increase the strength of the second connecting block, thereby improving the strength of the circuit board frame mechanism. The rigid annular pads are made of one or more of nickel-based alloys, ceramics, aluminum silicate fiber, graphite, and porous polypropylene foam.

[0034] Preferably, U-shaped grooves 16 are respectively provided on both ends of the mounting bracket, and buffer blocks are installed in the U-shaped grooves 16. The buffer blocks buffer the vibration transmitted to the mounting bracket by the first connecting block and the second connecting block, reduce the vibration of the circuit board on the mounting bracket by external vibration, and ensure the stability of the connection of each contact point on the circuit board.

[0035] like Figure 4 As shown, the motor mechanism includes a motor 10, a motor vibration isolation sleeve 11, and a motor connector 12. The motor 10 is installed in the motor vibration isolation sleeve 11 to reduce the impact of external vibration factors on the stable operation of the motor 10. The motor vibration isolation sleeve 11 is installed inside the driver anti-pressure cylinder 9. The motor connector 12 is installed on the right end of the motor 10 inside the driver anti-pressure cylinder 9. The right end of the motor connector 12 is connected to a second connecting block set on the left end of the circuit board frame 13. An isolation ring is provided between the right end of the motor connector 12 and the left end of the second connecting block. The isolation ring is made of aluminum silicate fiber. An annular connecting groove is provided on the outer wall of the motor vibration isolation sleeve 11 near its left end. An annular damping ring is installed in the annular connecting groove.

[0036] like Figure 5As shown, the magnetic shielding mechanism includes a magnetic shielding shell 5, an inner magnet 6, and an outer magnet 7. The magnetic shielding shell 5 is installed inside the reducer pressure-resistant cylinder 1. The reducer 2 is connected to the left end of the magnetic shielding shell 5. An annular sealing groove is provided on the outer wall of the magnetic shielding shell 5 near its left end. Two annular sealing grooves are arranged side by side. A second sealing ring is installed in each annular sealing groove. The outer wall of the second sealing ring is attached to the inner wall of the reducer pressure-resistant cylinder 1 to increase the sealing between the magnetic shielding shell 5 and the reducer pressure-resistant cylinder 1. A connecting groove is provided along its axial direction on the right end face of the magnetic shielding shell 5. The connecting groove is used to install a drive shaft. The right end of the drive shaft is connected to a flexible coupling 8. The inner magnet 6 is installed inside the magnetic shielding shell 5 to avoid the influence of the magnet generated by the motor rotation or other magnetic components on the pulse signal. A groove is provided on the outer wall of the magnetic shielding shell 5 near its center to accommodate a sealing ring, thereby increasing the sealing performance of the magnetic shielding shell 5 and ensuring that the inner magnet 6 can still work stably in a high-sulfur environment. The right end of the magnetic shielding shell 5 is connected to the outer magnet 7. The right end of the outer magnet 7 is installed inside the driver anti-pressure cylinder 9 near its left end, and the right end of the outer magnet 7 is fitted onto the left end of the flexible coupling 8. The right end of the flexible coupling 8 is connected to the output shaft of the motor 10. The right end of the reducer 2 is connected to the magnetic shielding shell 5 through the input shaft cover plate 3 and the gasket 4 to reduce the impact of the reducer 2 structural vibration on the magnetic shielding mechanism.

[0037] This invention also proposes a method for using a rotary pulse generator drive device for downhole high-pressure measurement while drilling, for controlling the aforementioned drive device, specifically including the following steps: Step 1: The electronic components on the circuit board skeleton receive control signals from the ground control center and convert the control signals into PWM wave signals to control the rotation of the motor. Step 2: The motor mechanism acquires a PWM wave signal to operate, driving the flexible coupling 8 to rotate. The flexible coupling 8 drives the inner magnet 6 to rotate, and the inner magnet 6 rotates to cut the magnetic field of the outer magnet 7 to generate a magnetic field signal. Specifically, the motor connector 12 acquires the PWM wave signal and transmits the PWM wave signal to the motor 10, causing the motor 10 to rotate and complete the rotational motion of the motor 10.

[0038] Step 3: The electronic components on the circuit board skeleton receive the magnetic field signal and transmit it to the ground control center. The ground control center analyzes the changing patterns of the magnetic field signal to diagnose the working status of the downhole drill bit, thereby adjusting the drilling speed in real time to ensure the safety of drilling operations.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A rotary pulse generator drive device for downhole high-pressure measurement while drilling, characterized in that, It includes an external pressure-bearing structure, a circuit board frame mechanism, a motor mechanism, a flexible coupling (8), a magnetic shielding mechanism, and a reducer (2). The external pressure-bearing structure includes a reducer pressure-resistant cylinder (1) and a driver pressure-resistant cylinder (9), with one end of the reducer pressure-resistant cylinder (1) connected to one end of the driver pressure-resistant cylinder (9); The circuit board skeleton mechanism, the motor mechanism and the flexible coupling (8) are installed in the driver pressure cylinder (9), the reducer (2) and the magnetic shielding mechanism are installed in the reducer pressure cylinder (1), one end of the reducer (2) is connected to one end of the magnetic shielding mechanism, the other end of the magnetic shielding mechanism is connected to one end of the motor mechanism, the other end of the motor mechanism is connected to one end of the flexible coupling (8), and the other end of the flexible coupling (8) is connected to one end of the circuit board skeleton mechanism; The magnetic shielding mechanism includes a magnetic shielding shell (5), an inner magnet (6), and an outer magnet (7). The magnetic shielding shell (5) is installed inside the reducer pressure cylinder (1), and one end of the magnetic shielding shell (5) is connected to the reducer (2), while the other end of the magnetic shielding shell (5) is connected to the outer magnet (7). The inner magnet (6) is installed inside the magnetic shielding shell (5). During operation, the inner magnet (6) rotates and cuts the magnetic field of the outer magnet (7) to generate a magnetic field signal.

2. The rotary pulse generator transmission device for downhole high-pressure measurement while drilling according to claim 1, characterized in that, The reducer pressure cylinder (1) has a first trapezoidal groove at its end and the driver pressure cylinder (9) has a trapezoidal platform at its end. The trapezoidal platform is installed in the first trapezoidal groove, and the reducer pressure cylinder (1) and the driver pressure cylinder (9) are connected to form a cylindrical cylinder.

3. The rotary pulse generator transmission device for downhole high-pressure measurement while drilling according to claim 2, characterized in that, An annular groove is provided on the trapezoidal platform, and a first sealing ring is installed in the annular groove, with the outer wall of the first sealing ring fitting against the inner wall of the first trapezoidal groove.

4. The rotary pulse generator transmission device for downhole high-pressure measurement while drilling according to claim 1, characterized in that, An annular sealing groove is provided on the outer wall of the magnetic shielding shell (5), and a second sealing ring is installed in the annular sealing groove. The outer wall of the second sealing ring is attached to the inner wall of the reducer pressure cylinder (1).

5. The rotary pulse generator transmission device for downhole high-pressure measurement while drilling according to claim 1, characterized in that, The circuit board frame mechanism includes a circuit board frame (13), a driver expansion ring (14), and a driver plug (15). The circuit board frame (13) is installed inside the driver pressure cylinder (9). One end of the circuit board frame (13) is connected to the motor mechanism, and the other end of the circuit board frame (13) is connected to the driver plug (15). The driver expansion ring (14) is installed between the circuit board frame (13) and the driver plug (15).

6. The rotary pulse generator transmission device for downhole high-pressure measurement while drilling according to claim 5, characterized in that, The circuit board frame includes a mounting bracket, a first connecting block is provided on one end of the mounting bracket, and a second connecting block is provided on the other end of the mounting bracket. The first connecting block is connected to the driver plug (15), and the second connecting block is connected to the motor mechanism. The outer wall of the second connecting block is provided with an annular mounting groove, and a rigid annular pad is installed in the annular mounting groove.

7. The rotary pulse generator transmission device for downhole high-pressure measurement while drilling according to claim 6, characterized in that, The rigid annular pad is made of one or more of the following materials: nickel-based alloy, ceramic, aluminum silicate fiber, graphite, and porous polypropylene foam.

8. The rotary pulse generator transmission device for downhole high-pressure measurement while drilling according to claim 7, characterized in that, The mounting bracket has U-shaped grooves (16) on both ends, and buffer blocks are installed in the U-shaped grooves (16).

9. The rotary pulse generator transmission device for downhole high-pressure measurement while drilling according to claim 5, characterized in that, The motor mechanism includes a motor (10), a motor vibration isolation sleeve (11), and a motor connector (12). The motor vibration isolation sleeve (11) is installed inside the driver pressure cylinder (9). The motor (10) is installed inside the motor vibration isolation sleeve (11). The output shaft of the motor (10) is connected to the flexible coupling (8). The motor connector (12) is installed on one end of the motor (10) away from the flexible coupling (8). The motor connector (12) is connected to one end of the circuit board frame (13) away from the driver plug (15).

10. A method for using a rotary pulse generator drive device for downhole high-pressure measurement while drilling, characterized in that, Includes the following steps: Step 1: The electronic components on the circuit board skeleton receive control signals from the ground control center and convert the control signals into PWM wave signals to control the rotation of the motor. Step 2: The motor mechanism acquires a PWM wave signal to operate, driving the flexible coupling 8 to rotate. The flexible coupling drives the inner magnet to rotate, and the rotating inner magnet cuts the outer magnet to generate a magnetic field signal. Step 3: The electronic components on the circuit board frame receive the magnetic field signal and transmit it to the ground control center.

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