A flow switch control circuit

Abstract

This application provides a flow switch control system, comprising: an accelerometer, a filter module, a comparator, a proportional-integral circuit, and an output buffer connected in sequence; the accelerometer is used to monitor the voltage signal generated when mud waves pass through a pulser; the filter module is used to remove frequency components below a preset vibration frequency from the voltage signal to obtain a target voltage signal; the comparator is used to convert the target voltage signal into a pulse digital signal based on the relationship between the target voltage signal and a preset reference voltage in the comparator; the proportional-integral circuit is used to obtain a pulse control signal by proportionally amplifying and integrating the digital signal; and the output buffer is used to buffer and isolate the pulse control signal. This ensures the normal operation and precise adjustment of the flow switch.

Description

Technical Field

[0001] This disclosure relates to the field of automation control technology, and in particular to a flow switch control circuit. Background Technology

[0002] During directional drilling, the pulser, as a key downhole device, transmits important geological steering data, including well inclination, azimuth, and gamma values, to the surface via mud waves. This data is crucial for accurate geological steering and directly affects the success of the operation.

[0003] The rotary valve pulsers used in existing technology have significant problems. These pulsers consume a large amount of electricity during operation and remain operational even when the pump is not running, resulting in unnecessary waste of battery power. In addition, the pulsers typically use high-temperature lithium batteries as their power source. In the high-temperature environment downhole, the batteries are prone to excessive internal pressure due to over-discharge or over-charge, posing a serious risk of explosion.

[0004] Therefore, it is necessary to design a flow switch control system to control the working state of the pulser during directional construction, thereby extending its service life. Summary of the Invention

[0005] This disclosure provides a flow switch control circuit for controlling the working state of a pulse generator during directional construction, thereby solving the problems of low battery efficiency and safety hazards in existing pulse generators.

[0006] On one hand, this disclosure provides a flow switch control system, including: an acceleration sensor, a filter module, a comparator, a proportional-integral circuit and an output buffer connected in sequence;

[0007] The acceleration sensor is used to monitor the voltage signal generated when the mud wave passes through the pulser;

[0008] The filtering module is used to remove frequency components in the voltage signal that are below a preset vibration frequency to obtain the target voltage signal;

[0009] The comparator is used to convert the target voltage signal into a pulse digital signal according to the relationship between the target voltage signal and a preset reference voltage in the comparator.

[0010] The proportional-integral circuit is used to obtain a pulse control signal by proportionally amplifying and integrating the digital signal.

[0011] The output buffer is used to buffer and isolate the pulse control signal.

[0012] In one exemplary embodiment, the filtering module includes: a first filter, a signal amplifier, and a second filter connected in sequence;

[0013] The first filter is used to remove frequency components in the voltage signal that are below the preset vibration frequency, so as to obtain a filtered voltage signal.

[0014] The signal amplifier is used to amplify the filtered voltage signal by a preset factor to obtain an amplified voltage signal.

[0015] The second filter is used to eliminate low-frequency noise in the amplified voltage signal to obtain the target voltage signal.

[0016] In one exemplary embodiment, it further includes: a battery voltage comparison circuit and a logic AND connected in sequence, wherein the output buffer is connected to the logic AND;

[0017] The battery voltage comparison circuit is used to monitor the battery voltage value and generate a corresponding power supply control signal based on the monitoring result.

[0018] The logical AND operation is used to combine the power supply control signal and the pulse control signal to synthesize the target control signal.

[0019] In one exemplary embodiment, the digital signal type includes: a high-level digital signal and a low-level digital signal;

[0020] The comparator is specifically used to determine whether the target signal voltage is greater than a preset reference voltage in the comparator; if so, the target signal voltage is converted into a high-level digital signal; if not, the target signal voltage is converted into a low-level digital signal.

[0021] In an exemplary embodiment, the proportional-integral circuit is specifically configured to determine a proportional error and a cumulative error based on the magnitude of the error between the target signal voltage and the reference voltage, and the digital signal type of the target signal voltage; and to generate the pulse control signal based on the proportional error and the cumulative error.

[0022] In one exemplary embodiment, the first filter is a high-pass filter; the second filter is a passive high-pass filter.

[0023] In one exemplary embodiment, the preset vibration frequency is 4Hz.

[0024] In one exemplary embodiment, the preset multiple is 5 times.

[0025] In one exemplary embodiment, the battery is specifically a lithium battery.

[0026] On the other hand, this disclosure provides a flow switch, characterized in that it is equipped with a flow switch control system as described in any one of claims 1 to 9.

[0027] As can be seen from the above technical solutions, this disclosure has the following advantages:

[0028] This disclosure provides a flow switch control system, comprising: an accelerometer, a filter module, a comparator, a proportional-integral circuit, and an output buffer connected in sequence; the accelerometer is used to monitor the voltage signal generated when mud waves pass through a pulser; the filter module is used to remove frequency components below a preset vibration frequency from the voltage signal to obtain a target voltage signal; the comparator is used to convert the target voltage signal into a pulse digital signal based on the relationship between the target voltage signal and a preset reference voltage in the comparator; the proportional-integral circuit is used to obtain a pulse control signal by proportionally amplifying and integrating the digital signal; and the output buffer is used to buffer and isolate the pulse control signal. After the filter module removes the frequency components below the preset vibration frequency from the collected voltage signal, the comparator converts the target voltage signal into a pulse digital signal based on the relationship between the target voltage signal and the reference voltage. Then, after amplification and integration by the proportional-integral circuit, a pulse control signal capable of controlling the pulser is obtained, thereby ensuring the normal operation and precise adjustment of the flow switch. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A schematic diagram of the flow switch control system provided in Embodiment 1 of this disclosure is shown as an example;

[0031] Figure 2 A schematic diagram of the flow switch control system provided in Embodiment 2 of this disclosure is shown as an example;

[0032] Figure 3 A schematic diagram of the flow switch control system provided in Embodiment 3 of this disclosure is shown as an example. Detailed Implementation

[0033] This disclosure provides a flow switch control system for controlling the working state of a pulse generator during directional construction, thereby addressing the problems of low battery efficiency and safety hazards in existing pulse generators.

[0034] To make the inventive objectives, features, and advantages of this disclosure more apparent and understandable, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0035] Example 1

[0036] Figure 1 An exemplary schematic diagram of a flow switch control system provided in Embodiment 1 of this disclosure is shown, such as... Figure 1 As shown, in this example, the flow switch control system includes: an acceleration sensor 101, a filter module 102, a comparator 103, a proportional-integral circuit 104, and an output buffer 105 connected in sequence.

[0037] The acceleration sensor 101 is used to monitor the voltage signal generated when the mud wave passes through the pulser;

[0038] The filtering module 102 is used to remove frequency components in the voltage signal that are below a preset vibration frequency to obtain the target voltage signal;

[0039] The comparator 103 is used to convert the target voltage signal into a pulse digital signal according to the magnitude relationship between the target voltage signal and the reference voltage preset in the comparator.

[0040] The proportional-integral circuit 104 is used to obtain a pulse control signal by proportionally amplifying and integrating the digital signal;

[0041] The output buffer 105 is used to buffer and isolate the pulse control signal.

[0042] In this embodiment, the accelerometer 101 acquires the voltage signal generated when the mud wave passes through the pulser in real time to capture the dynamic changes in the mud flow and thus obtain an accurate mud flow signal. The filter module 102 removes interference components below a preset vibration frequency from the voltage signal, ensuring that the target voltage signal contains only effective information useful for analysis by the flow switch control system, thereby improving the accuracy of the subsequently generated pulse control signal. The comparator 103 converts the analog signal into a pulse digital signal based on the relationship between the target voltage signal and the reference voltage to facilitate the provision of clear control signal logic. The proportional-integral circuit 104 performs proportional amplification and integration on the pulse digital signal to provide clear control signal logic. The output buffer buffers and electrically isolates the pulse control signal, ensuring its stability and reliability during transmission and guaranteeing that the pulse control signal can accurately control the pulser's operating state.

[0043] The above embodiment provides a flow switch control system, including: an acceleration sensor 102, a filter module 102, a comparator 103, a proportional-integral circuit 104, and an output buffer 105 connected in sequence; the acceleration sensor 101 is used to monitor the voltage signal generated when mud waves pass through the pulser; the filter module 102 is used to remove frequency components below a preset vibration frequency from the voltage signal to obtain a target voltage signal; the comparator 103 is used to convert the target voltage signal into a pulse digital signal according to the relationship between the target voltage signal and a preset reference voltage in the comparator; the proportional-integral circuit 104 is used to obtain a pulse control signal by proportionally amplifying and integrating the digital signal; and the output buffer 105 is used to buffer and isolate the pulse control signal. After the filter module 102 removes the frequency portion of the collected voltage signal below the preset vibration frequency, the comparator 103 converts the target voltage signal into a pulse digital signal based on the relationship between the target voltage signal and the reference voltage. Then, after amplification and integration by the proportional-integral circuit, a pulse control signal that can control the pulse generator is obtained, thereby ensuring the normal operation and precise adjustment of the flow switch.

[0044] Example 2

[0045] Figure 2 An exemplary schematic diagram of the flow switch control system provided in Embodiment 2 of this disclosure is shown, such as... Figure 2 As shown, the system includes an acceleration sensor 201, a filter module 202, a comparator 203, a proportional-integral circuit 204, and an output buffer 205 connected in sequence.

[0046] The acceleration sensor 201 is used to monitor the voltage signal generated when the mud wave passes through the pulser;

[0047] The filtering module 202 is used to remove frequency components in the voltage signal that are below a preset vibration frequency to obtain the target voltage signal.

[0048] The comparator 203 is used to convert the target voltage signal into a pulse digital signal according to the relationship between the target voltage signal and a preset reference voltage in the comparator.

[0049] The proportional-integral circuit 204 is used to obtain a pulse control signal by proportionally amplifying and integrating the digital signal;

[0050] The output buffer 205 is used to buffer and isolate the pulse control signal.

[0051] The filtering module 202 includes a first filter 2021, a signal amplifier 2022, and a second filter 2023 connected in sequence.

[0052] The first filter 2021 is used to remove frequency components in the voltage signal that are below the preset vibration frequency, so as to obtain a filtered voltage signal;

[0053] The signal amplifier 2022 is used to amplify the filtered voltage signal by a preset factor to obtain an amplified voltage signal;

[0054] The second filter 2023 is used to eliminate low-frequency noise in the amplified voltage signal to obtain the target voltage signal.

[0055] In the second embodiment described above, for the voltage signal generated when the mud wave passes through the pulser, acquired by the accelerometer 201, the first filter 2021 removes frequency components below a preset vibration frequency from the voltage signal, resulting in a filtered voltage that retains only the high-frequency components related to the mud wave. Then, the filtered voltage signal is amplified by a signal amplifier 2022 at a preset multiple to more effectively identify and process the target voltage signal. Furthermore, since low-frequency noise still exists in the amplified voltage signal, a second filter 2023 is needed to eliminate this low-frequency noise, thereby obtaining a signal with higher reliability to accurately reflect the vibration frequency information.

[0056] Example 3

[0057] Figure 3 An exemplary schematic diagram of the flow switch control system provided in Embodiment 3 of this disclosure is shown, such as... Figure 3As shown, the flow switch control system includes: an acceleration sensor 301, a filter module 302, a comparator 303, a proportional-integral circuit 304, and an output buffer 305 connected in sequence.

[0058] The acceleration sensor 301 is used to monitor the voltage signal generated when the mud wave passes through the pulser;

[0059] The filtering module 302 is used to remove frequency components in the voltage signal that are below a preset vibration frequency to obtain the target voltage signal.

[0060] The comparator 303 is used to convert the target voltage signal into a pulse digital signal according to the relationship between the target voltage signal and the preset reference voltage in the comparator.

[0061] The proportional-integral circuit 304 is used to obtain a pulse control signal by proportionally amplifying and integrating the digital signal;

[0062] The output buffer 305 is used to buffer and isolate the pulse control signal.

[0063] The filtering module 302 includes a high-pass filter 3021, a signal amplifier 3022, and a passive high-pass filter 3023 connected in sequence.

[0064] The high-pass filter 3021 is used to remove frequency components below a preset vibration frequency of 4Hz from the voltage signal to obtain a filtered voltage signal.

[0065] The signal amplifier 3022 is used to amplify the filtered voltage signal by a preset factor of 5 to obtain an amplified voltage signal.

[0066] The passive high-pass filter 3023 is used to eliminate low-frequency noise in the amplified voltage signal to obtain the target voltage signal.

[0067] It also includes: a battery voltage comparison circuit 307 and a logic AND 306 connected in sequence, wherein the output buffer 305 and the logic AND 306 are connected;

[0068] The battery voltage comparison circuit 307 is used to monitor the battery voltage value and generate a corresponding power supply control signal based on the monitoring result.

[0069] The logic AND 306 is used to combine the power supply control signal and the pulse control signal to synthesize the target control signal.

[0070] It should be noted that a high-pass filter is an electronic circuit that can transmit high-frequency signals while attenuating or blocking low-frequency signals. Its main function is to allow signals above a certain "cutoff frequency" to pass through, while signals below this frequency are weakened or completely blocked.

[0071] A passive high-pass filter is a high-pass filter built using only passive components. It does not require an external power supply or amplifier because the passive components themselves do not have amplification capabilities.

[0072] In this embodiment of the disclosure, the digital signal types include: high-level digital signals and low-level digital signals; comparator 303 is used to determine whether the target signal voltage is greater than a preset reference voltage in the comparator; if yes, the target signal voltage is converted into the high-level digital signal; if no, the target signal voltage is converted into the low-level digital signal.

[0073] The proportional-integral circuit 304 is used to determine the proportional error and the cumulative error based on the magnitude of the error between the target signal voltage and the reference voltage, and the digital signal type of the target signal voltage; and to generate the pulse control signal based on the proportional error and the cumulative error.

[0074] The battery voltage comparison circuit 307 is connected to the pulse generator power supply of lithium battery type, monitors the battery voltage of pulse power supply, and generates a power supply control signal when the battery voltage is too low to cut off the power supply to the pulse generator, so as to protect the safety of lithium battery at high temperature, reduce the risk of lithium battery explosion, and thus ensure the safety of downhole operation.

[0075] After acquiring the pulse control signal and the power supply control signal, they are synthesized by logic and 306 to obtain the target control signal.

[0076] In the above embodiment three, an accelerometer 301, a high-pass filter 302, a signal amplifier 303, and a passive high-pass filter 304 detect effective fluctuation signals above 4Hz, i.e., the target voltage signal, and then control the start of the pulse generator, achieving the effect of not consuming battery power when the pump is not running. At the same time, a battery voltage comparison circuit 307 is introduced to ensure automatic power-off when the battery voltage is too low, protecting the safety of the lithium battery at high temperatures, avoiding safety risks caused by over-discharge and over-charge, improving the safety and efficiency of directional well construction, and thus improving the accuracy of geological guidance and the reliability of construction.

[0077] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0078] In the several embodiments provided in this application, it should be understood that the methods, apparatuses, electronic devices, and storage media disclosed herein can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0079] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0080] Furthermore, the functional units in the various embodiments of this disclosure can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0081] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this disclosure, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this disclosure. The aforementioned readable storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0082] The above-described embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A flow switch control circuit, characterized by, include: The acceleration sensor, filter module, comparator, proportional-integral circuit and output buffer are connected in sequence. The acceleration sensor is used to monitor the voltage signal generated when the mud wave passes through the pulser; The filtering module is used to remove frequency components in the voltage signal that are below a preset vibration frequency to obtain the target voltage signal; The comparator is used to convert the target voltage signal into a pulse digital signal according to the relationship between the target voltage signal and a preset reference voltage in the comparator. The proportional-integral circuit is used to obtain a pulse control signal by proportionally amplifying and integrating the digital signal. The output buffer is used to buffer and isolate the pulse control signal.

2. The flow switch control circuit of claim 1, wherein, The filtering module includes: a first filter, a signal amplifier, and a second filter connected in sequence; The first filter is used to remove frequency components in the voltage signal that are below the preset vibration frequency, so as to obtain a filtered voltage signal. The signal amplifier is used to amplify the filtered voltage signal by a preset factor to obtain an amplified voltage signal. The second filter is used to eliminate low-frequency noise in the amplified voltage signal to obtain the target voltage signal.

3. The flow switch control circuit according to claim 1 or 2, characterized in that, Also includes: A battery voltage comparison circuit and a logic AND circuit are connected in sequence, and the output buffer is connected to the logic AND circuit. The battery voltage comparison circuit is used to monitor the battery voltage value and generate a corresponding power supply control signal based on the monitoring result. The logical AND operation is used to combine the power supply control signal and the pulse control signal to synthesize the target control signal.

4. The flow switch control circuit according to claim 3, characterized in that, Digital signal types include: high-level digital signals and low-level digital signals; The comparator is specifically used to determine whether the target signal voltage is greater than a preset reference voltage in the comparator; if so, the target signal voltage is converted into a high-level digital signal; if not, the target signal voltage is converted into a low-level digital signal.

5. The flow switch control circuit according to claim 4, characterized in that, The proportional-integral circuit is specifically used to determine the proportional error and the cumulative error based on the magnitude of the error between the target signal voltage and the reference voltage, and the digital signal type of the target signal voltage, respectively. Furthermore, the pulse control signal is generated based on the proportional error and the cumulative error.

6. The flow switch control circuit according to claim 2, characterized in that, The first filter and the second filter are high-pass filters.

7. The flow switch control circuit according to claim 6, characterized in that, The second filter is a passive high-pass filter.

8. The flow switch control circuit according to claim 1, characterized in that, The preset vibration frequency is 4Hz.

9. The flow switch control circuit according to claim 2, characterized in that, The preset multiplier is 5 times.

10. The flow switch control circuit according to claim 3, characterized in that, The battery is specifically a lithium battery.

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