Power supply management system suitable for wired measurement-while-drilling exploring tube
By using a power management system controlled by microprocessor U3 in the wired drilling measurement probe, automatic switching between external cables and built-in lithium batteries is achieved, solving the power supply loss and stability of the traditional wired drilling measurement system, and improving the power supply stability and measurement accuracy of the sensor.
Patent Information
- Application Number
- CN202422069938.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-26
AI Technical Summary
Traditional wired drilling measurement systems have significant shortcomings in power supply, including large power supply losses and poor power supply stability. Especially when the cable length increases, the power loss significantly increases and the downhole environment is complex and changeable, resulting in the sensor measurement accuracy and stability being affected.
The power management system controlled by the microprocessor U3 is used to reduce the power supply loss on the cable through the automatic switching mechanism of external cables and built-in lithium batteries, and switch to the lithium battery power supply when the power supply is unstable to ensure the stable power supply of the sensor.
It significantly reduces the cable power loss of traditional wired drilling measurement systems, improves the power supply stability and measurement accuracy of sensors, and enhances the reliability of downhole parameter measurement.
Smart Images
Figure CN223093528U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a power management system, in particular to a power management system suitable for a wired measurement-while-drilling tool Background Art
[0002] In industries such as oil, geological exploration, and coal mining, the measurement-while-drilling (MWD) system plays a crucial role. These systems can measure and transmit various downhole parameters in real time, such as well inclination, azimuth, tool face angle, and bottom hole temperature, etc., so as to help drilling engineers precisely control the wellbore trajectory, improve drilling efficiency and quality, and reduce drilling accidents. However, traditional wired measurement-while-drilling systems have significant deficiencies in power supply, especially in terms of power loss and power supply stability of the cable.
[0003] Traditional wired measurement-while-drilling systems mainly transmit the energy of the ground power supply to the sensors of the downhole measurement-while-drilling system through long cables. The above mode has the following main problems:
[0004] (1) Large power supply loss: As the length of the cable increases, the resistance also increases, resulting in a significant increase in power loss during the transmission of electrical energy in the line. This not only reduces the working voltage of the sensor but also may affect its measurement accuracy and stability.
[0005] (2) Poor power supply stability: The downhole environment is complex and changeable, and the cable is easily affected by factors such as vibration, abrasion, and corrosion, further exacerbating the power supply instability. Power supply interruption or voltage fluctuation may cause sensor data loss or an increase in measurement error. Summary of the Utility Model
[0006] The utility model aims to solve the above defects and provides a power management system suitable for a wired measurement-while-drilling tool.
[0007] To overcome the defects in the background art, the technical solution adopted by the utility model to solve its technical problems is: This power management system suitable for a wired measurement-while-drilling tool includes a microprocessor U3. The output of the microprocessor U3 is connected to a cable power supply enable switch circuit, a voltage stabilization circuit enable switch circuit, a sensor power supply enable switch circuit, and a sensor interface. The input of the microprocessor U3 is connected to a cable power supply voltage measurement circuit and a lithium battery voltage measurement circuit. The output of the cable power supply enable switch circuit is connected to a cable and lithium battery automatic switching circuit. The output of the cable and lithium battery automatic switching circuit is connected to the voltage stabilization circuit enable switch circuit. The output of the voltage stabilization circuit enable switch circuit is connected to a 5V voltage stabilization circuit. The output of the 5V voltage stabilization circuit is connected to the sensor power supply enable switch circuit. The output of the sensor power supply enable switch circuit is connected to the sensor interface.
[0008] According to another embodiment of the present utility model, it further includes that one end of resistor R2 and one end of resistor R5 on the cable power supply voltage measurement circuit are connected to the ADC_VBUS terminal on the microprocessor U3. The other end of resistor R5 is grounded. The other end of resistor R2 is connected to one end of resistor R4 on the cable power supply enable switch circuit, pin 5 of the power switch chip U1 on the cable power supply enable switch circuit, and one end of capacitor C1. The other end of capacitor C1 is grounded. The other end of resistor R4 is connected to pin 3 of the power switch chip U1. Pin 4 of the power switch chip U1 is connected to one end of resistor R8 and the BUS_CTRL terminal of the microprocessor U3. The other end of resistor R8 is grounded. Pin 2 of the power switch chip U1 is connected to one end of resistor R7. The other end of resistor R7 is grounded. Pin 1 of the power switch chip U1 is connected to one end of capacitor C2, pin 4 of the battery charging chip U4 on the cable and lithium battery automatic switching circuit, one end of resistor R14, the anode of diode D1, one end of resistor R11, one end of capacitor C6, and the G terminal of MOS transistor Q2. The other end of capacitor C2 is grounded. Pin 1 of the battery charging chip U4 is connected to the cathode of the light-emitting diode IDX1. The anode of the light-emitting diode IDX1 is connected to the other end of resistor R11.The other end of the capacitor C6 is grounded. The 3rd pin of the battery charging chip U4 is connected to the anode of the diode D2, the D end of the MOS transistor Q2, one end of the resistor R1 on the lithium battery voltage measurement circuit, and the S end of the MOS transistor Q1. The cathode of the diode D2, the S end of the MOS transistor Q2, and the cathode of the diode D1 are connected to one end of the capacitor C7, the 1st pin of the load switch U2 on the voltage stabilizing circuit enabling switch circuit, and one end of the capacitor C4. The other end of the capacitor C4 is grounded. The 3rd pin of the load switch U2 is connected to one end of the resistor R12, the 5th end of the power switch chip U1 on the cable power supply enabling switch circuit, one end of the resistor R4, one end of the capacitor C1, and one end of the resistor R2 on the cable power supply voltage measurement circuit. The other end of the resistor R12 is grounded. The 6th pin of the load switch U2 is connected to one end of the resistor R10, one end of the capacitor C5, and the 4th end of the DC boost power supply chip U5 on the 5V voltage stabilizing circuit. The other end of the capacitor C5 is grounded. The lithium battery voltage measurement circuit further includes that one end of the resistor R1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to the G end of the MOS transistor Q1, the D end of the MOS transistor Q1 is connected to one end of the resistor R6, the other end of the resistor R6 is connected to one end of the resistor R9 and one end of the capacitor C3, the other end of the resistor R9 and the other end of the capacitor C3 are grounded, one end of the resistor R3 and one end of the resistor R1 are connected to the BAT_ADC_CTRL end of the microprocessor U3, and one end of the resistor R9 and one end of the capacitor C3 are connected to the ADC_BAT end of the microprocessor U3. Between the 1st end and the 2nd end of the DC boost power supply chip U5 on the 5V voltage stabilizing circuit, the resistors C10, C11, and C12 are connected. One ends of the resistors C10, C11, and C12 are connected to the 1st pin of the load switch U6 on the sensor power supply enabling switch circuit. The resistor C8 is also connected to the 1st pin of the load switch U6. The 3rd pin of the load switch U6 is connected to the resistor R16 and is also connected to the CTRL_SENSOR pin of the microprocessor U3. The 5th pin of the load switch U6 is connected to one end of the resistor R15. The 6th pin of the load switch U6 is connected to the other end of the resistor R15, one end of the capacitor C9, and the sensor interface. The other end of the capacitor C9 is grounded.,
[0009] The beneficial effects of the present utility model are as follows: This power management system applicable to the wired measurement while drilling tool string supplies power to the sensor through an external cable and an internal battery. When the cable is long, the user can switch to the internal lithium battery for independent power supply through an instruction, significantly reducing the power supply loss on the cable of the traditional wired measurement while drilling system and improving the stability of the sensor power supply., BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The present utility model will be further described below in conjunction with the drawings and embodiments.,
[0011] Figure 1 is a schematic diagram of the principle structure block diagram of the present utility model;
[0012] Figure 2 is Figure 1 Schematic diagram of the cable power supply voltage measurement circuit;
[0013] Figure 3 is Figure 1 Schematic diagram of the lithium battery voltage measurement circuit;
[0014] Figure 4 is Figure 1 Schematic diagram of the cable power supply enable switch circuit;
[0015] Figure 5 is Figure 1 Schematic diagram of the automatic switching circuit between the cable and the lithium battery;
[0016] Figure 6 is Figure 1 Schematic diagram of the voltage stabilizing circuit enable switch circuit;
[0017] Figure 7 is Figure 1 Schematic diagram of the 5V voltage stabilizing circuit;
[0018] Figure 8 is Figure 1 Schematic diagram of the connection between the sensor power enable switch and the sensor interface.
[0019] Figure 9 is Figure 1 Schematic diagram of the microprocessor. Detailed implementation manners
[0020] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. For the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0021] A power management system for a wired measurement while drilling tool, such as Figure 1As shown, it includes a microprocessor U3. The output of the microprocessor U3 is connected to a cable power supply enabling switch circuit, a voltage stabilization circuit enabling switch circuit, a sensor power supply enabling switch circuit, and a sensor interface. The input of the microprocessor U3 is connected to a cable power supply voltage measurement circuit and a lithium battery voltage measurement circuit. The output of the cable power supply enabling switch circuit is connected to a cable and lithium battery automatic switching circuit. The output of the cable and lithium battery automatic switching circuit is connected to the voltage stabilization circuit enabling switch circuit. The output of the voltage stabilization circuit enabling switch circuit is connected to a 5V voltage stabilization circuit. The output of the 5V voltage stabilization circuit is connected to the sensor power supply enabling switch circuit. The output of the sensor power supply enabling switch circuit is connected to the sensor interface.
[0022] The specific circuit structure, such as Figure 2As shown, one end of resistor R2 and one end of resistor R5 on the cable power supply voltage measurement circuit are connected to the ADC_VBUS terminal on the microprocessor U3. The other end of resistor R5 is grounded. The other end of resistor R2 is connected to one end of resistor R4 on the cable power supply enable switch circuit, pin 5 of the power switch chip U1 on the cable power supply enable switch circuit, and one end of capacitor C1. The other end of capacitor C1 is grounded. The other end of resistor R4 is connected to pin 3 of the power switch chip U1. Pin 4 of the power switch chip U1 is connected to one end of resistor R8 and the BUS_CTRL terminal of the microprocessor U3. The other end of resistor R8 is grounded. Pin 2 of the power switch chip U1 is connected to one end of resistor R7. The other end of resistor R7 is grounded. Pin 1 of the power switch chip U1 is connected to one end of capacitor C2, pin 4 of the battery charging chip U4 on the cable and lithium battery automatic switching circuit, one end of resistor R14, the anode of diode D1, one end of resistor R11, one end of capacitor C6, and the G terminal of MOS transistor Q2. The other end of capacitor C2 is grounded. Pin 1 of the battery charging chip U4 is connected to the cathode of the light-emitting diode IDX1. The anode of the light-emitting diode IDX1 is connected to the other end of resistor R11.The other end of the capacitor C6 is grounded. The 3rd pin of the battery charging chip U4 is connected to the anode of the diode D2, the D terminal of the MOS transistor Q2, one end of the resistor R1 on the lithium battery voltage measurement circuit, and the S terminal of the MOS transistor Q1. The cathode of the diode D2, the S terminal of the MOS transistor Q2, and the cathode of the diode D1 are connected to one end of the capacitor C7, the 1st pin of the load switch U2 on the voltage stabilization circuit enabling switch circuit, and one end of the capacitor C4. The other end of the capacitor C4 is grounded. The 3rd pin of the load switch U2 is connected to one end of the resistor R12, the 5th terminal of the power switch chip U1 on the cable power supply enabling switch circuit, one end of the resistor R4, one end of the capacitor C1, and one end of the resistor R2 on the cable power supply voltage measurement circuit. The other end of the resistor R12 is grounded. The 6th pin of the load switch U2 is connected to one end of the resistor R10, one end of the capacitor C5, and the 4th terminal of the DC boost power supply chip U5 on the 5V voltage stabilization circuit. The other end of the capacitor C5 is grounded. The lithium battery voltage measurement circuit further includes that one end of the resistor R1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to the G terminal of the MOS transistor Q1, the D terminal of the MOS transistor Q1 is connected to one end of the resistor R6, the other end of the resistor R6 is connected to one end of the resistor R9 and one end of the capacitor C3, the other end of the resistor R9 and the other end of the capacitor C3 are grounded, one end of the resistor R3 and one end of the resistor R1 are connected to the BAT_ADC_CTRL terminal of the microprocessor U3, one end of the resistor R9 and one end of the capacitor C3 are connected to the ADC_BAT terminal of the microprocessor U3. Between the 1st terminal and the 2nd terminal of the DC boost power supply chip U5 on the 5V voltage stabilization circuit, the resistors C10, C11, and C12 are connected. One ends of the resistors C10, C11, and C12 are connected to the 1st pin of the load switch U6 on the sensor power supply enabling switch circuit. The resistor C8 is also connected to the 1st pin of the load switch U6. The 3rd pin of the load switch U6 is connected to the resistor R16 and is connected to the CTRL_SENSOR pin of the microprocessor U3. The 5th pin of the load switch U6 is connected to one end of the resistor R15. The 6th pin of the load switch U6 is connected to the other end of the resistor R15, one end of the capacitor C9, and the sensor interface. The other end of the capacitor C9 is grounded.,
[0023] The cable power supply is accessed through VBUS on the microprocessor U3. After access, one path conducts voltage sampling through the series circuit of resistors R2 and R5, and the sampling signal is connected to the ADC_VBUS terminal on the microprocessor U3. The other path enables the power switch chip U1 on the cable power supply enabling switch circuit. A pull-down resistor is connected to the enabling pin of this enabling switch and is connected to the BUS_CTRL terminal on the microprocessor U3. The microprocessor U3 can turn off the power switch chip U1 by pulling up BUS_CTRL; the output pin of the power switch chip U1 is connected to the cable and lithium battery power supply automatic switching circuit through the VBUS-B terminal. The diodes D1, D2, and the MOS transistor Q2 jointly realize the automatic switching of the VBUS-B terminal, the cable, and the lithium battery power supply circuit. That is, when the VBUS-B terminal is at a high level, the MOS transistor Q2 is closed, and this part of the circuit directly charges the lithium battery through U4 and supplies power to the subsequent circuit. When the VBUS-B terminal is at a low level, the MOS transistor Q2 conducts and supplies power to the subsequent circuit; the load switch U2 is an enabling switch chip for the voltage stabilization circuit, and the VBUS terminal is connected to the enabling pin of the load switch U2. That is, when the external cable supplies power normally, the load switch U2 is in a conducting state and delivers power to the 5V voltage stabilization circuit; U5 is a 5V voltage stabilization chip that can boost the input voltage to 5V; the 5V voltage is connected to the sensor interface through the sensor power supply enabling switch circuit. The enabling pin of this switch is connected to the CTRL_SENSOR terminal of the microprocessor U3 through the CTRL_SENSOR terminal, that is, the microprocessor U3 can control whether to enable the power supply to the sensor according to the user's instruction; R1, R3, Q1, R6, and R9 jointly constitute the lithium battery voltage measurement circuit. In the system startup state, Q1 is in a conducting state, and the microprocessor U3 measures the lithium battery voltage through the ADC_BAT terminal. In the system shutdown state, the BAT_ADC_CTRL of the microprocessor U3 is in a high-impedance state, and Q1 is in a closed state, and the current of the lithium battery will not be consumed through the resistors R6 and R9.
[0024] The above is only a preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.
Claims
1. A power management system applicable to a wired measurement-while-drilling tool, characterized in that: It includes a microprocessor U3, an output connection cable power supply enabling switch circuit, a voltage stabilizing circuit enabling switch circuit, a sensor power supply enabling switch circuit, and a sensor interface of the microprocessor U3. The input of the microprocessor U3 is connected to a cable power supply voltage measurement circuit and a lithium battery voltage measurement circuit. The output of the cable power supply enabling switch circuit is connected to a cable and lithium battery automatic switching circuit. The output of the cable and lithium battery automatic switching circuit is connected to the voltage stabilizing circuit enabling switch circuit. The output of the voltage stabilizing circuit enabling switch circuit is connected to a 5V voltage stabilizing circuit. The output of the 5V voltage stabilizing circuit is connected to the sensor power supply enabling switch circuit. The output of the sensor power supply enabling switch circuit is connected to the sensor interface.
2. The power management system for a wired measurement-while-drilling tool as claimed in claim 1, wherein: The ADC_VBUS terminal on the microprocessor U3 is connected to one end of resistor R2 and one end of resistor R5 on the cable power supply voltage measurement circuit. The other end of resistor R5 is grounded. The other end of resistor R2 is connected to one end of resistor R4 on the cable power supply enable switch circuit, pin 5 of the power switch chip U1 on the cable power supply enable switch circuit, and one end of capacitor C1. The other end of capacitor C1 is grounded. The other end of resistor R4 is connected to pin 3 of the power switch chip U1. Pin 4 of the power switch chip U1 is connected to one end of resistor R8 and the BUS_CTRL terminal of the microprocessor U3. The other end of resistor R8 is grounded. Pin 2 of the power switch chip U1 is connected to one end of resistor R7. The other end of resistor R7 is grounded. Pin 1 of the power switch chip U1 is connected to one end of capacitor C2, pin 4 of the battery charging chip U4 on the cable and lithium battery automatic switching circuit, one end of resistor R14, the anode of diode D1, one end of resistor R11, one end of capacitor C6, and the G terminal of MOS transistor Q2. The other end of capacitor C2 is grounded. Pin 1 of the battery charging chip U4 is connected to the cathode of the light-emitting diode IDX1. The anode of the light-emitting diode IDX1 is connected to the other end of resistor R11.The other end of the capacitor C6 is grounded. The 3rd pin of the battery charging chip U4 is connected to the anode of the diode D2, the D end of the MOS transistor Q2, one end of the resistor R1 on the lithium battery voltage measurement circuit, and the S end of the MOS transistor Q1. The cathode of the diode D2, the S end of the MOS transistor Q2, and the cathode of the diode D1 are connected to one end of the capacitor C7, the 1st pin of the load switch U2 on the voltage stabilizing circuit enabling switch circuit, and one end of the capacitor C4. The other end of the capacitor C4 is grounded. The 3rd pin of the load switch U2 is connected to one end of the resistor R12, the 5th end of the power switch chip U1 on the cable power supply enabling switch circuit, one end of the resistor R4, one end of the capacitor C1, and one end of the resistor R2 on the cable power supply voltage measurement circuit. The other end of the resistor R12 is grounded. The 6th pin of the load switch U2 is connected to one end of the resistor R10, one end of the capacitor C5, and the 4th end of the DC boost power supply chip U5 on the 5V voltage stabilizing circuit. The other end of the capacitor C5 is grounded. The lithium battery voltage measurement circuit further includes that one end of the resistor R1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to the G end of the MOS transistor Q1, the D end of the MOS transistor Q1 is connected to one end of the resistor R6, the other end of the resistor R6 is connected to one end of the resistor R9 and one end of the capacitor C3, the other end of the resistor R9 and the other end of the capacitor C3 are grounded, one end of the resistor R3 and one end of the resistor R1 are connected to the BAT_ADC_CTRL pin of the microprocessor U3, one end of the resistor R9 and one end of the capacitor C3 are connected to the ADC_BAT pin of the microprocessor U3. Between the 1st and 2nd ends of the DC boost power supply chip U5 on the 5V voltage stabilizing circuit, the resistors C10, C11, and C12 are connected. One ends of the resistors C10, C11, and C12 are connected to the 1st pin of the load switch U6 on the sensor power supply enabling switch circuit. The resistor C8 is also connected to the 1st pin of the load switch U6. The 3rd pin of the load switch U6 is connected to the resistor R16 and is connected to the CTRL_SENSOR pin of the microprocessor U3. The 5th pin of the load switch U6 is connected to one end of the resistor R15. The 6th pin of the load switch U6 is connected to the other end of the resistor R15, one end of the capacitor C9, and the sensor interface. The other end of the capacitor C9 is grounded.,