High-temperature downhole instrument power supply
By designing a high-temperature downhole instrument power supply, including a transformer, rectifier bridge, and capacitor board, and combining it with a power supply detection circuit, the problems of high power output and real-time monitoring under ultra-high temperature environments were solved, achieving stable power supply and reducing maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA NAT PETROLEUM CORP
- Filing Date
- 2024-11-11
- Publication Date
- 2026-05-12
AI Technical Summary
Existing logging instrument power supplies struggle to achieve high power output in ultra-high temperature environments and cannot monitor power status in real time, leading to unstable instrument operation and high maintenance costs.
A high-temperature downhole instrument power supply was designed, including a transformer, a rectifier bridge, and a capacitor board. Combined with a power supply detection circuit, it can monitor the cable head voltage, output voltage, current, and power supply temperature in real time, and transmit data and communicate through a data acquisition and control circuit.
It enables stable high-power power supply in ultra-high temperature environments, real-time monitoring of power supply status, reduces maintenance frequency and cost, and ensures normal operation of logging instruments.
Smart Images
Figure CN122026733A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of oil and gas exploration and development technology, and in particular to a high-temperature downhole instrument power supply. Background Technology
[0002] Battery-powered logging instruments are a crucial component of logging instruments, responsible for providing a stable and reliable power supply. In deep well drilling, such as wells reaching depths of tens of thousands of meters, the requirements for the logging instrument's power supply are even more stringent due to factors such as well depth and complex geological conditions.
[0003] Power supplies for logging instruments need to be resistant to high temperatures and pressures. In deep well drilling, such as those reaching depths of tens of thousands of meters, the temperature and pressure downhole are extremely high, requiring the power supply to withstand these extreme environments to ensure normal instrument operation. The power supply also needs to be highly efficient and have a long lifespan. During long drilling operations, the power supply needs to continuously and stably provide power to the instrument while maintaining high efficiency to reduce energy waste. Furthermore, the power supply's lifespan needs to be long enough to reduce the frequency of replacement and maintenance, thus lowering drilling costs. Finally, logging instrument power supplies also need intelligent management functions. By monitoring and controlling the power supply status in real time, stable output voltage and current can be maintained to ensure the normal operation of the logging instrument.
[0004] Commonly used power supplies for logging instruments include linear power supplies and switching power supplies. Linear power supplies offer stable output and low ripple, and their circuit structure is simple. They are suitable for high ambient temperatures, but high-power linear voltage regulation circuits are difficult to implement. Switching power supplies have high conversion efficiency and small size, but due to the temperature limitations of components such as PWM chips and switching transistors, they cannot be directly used in ultra-high temperature environments and need to be placed in a thermos in logging instruments.
[0005] (Patents: CN201110428047.4 A high-temperature power supply method, CN201210547504.6 A small-volume high-temperature power supply, CN201711244478.9 A high-temperature power supply module circuit, CN201410847822.3 High-temperature power supply for oil well logging) Most high-temperature power supplies achieve their high-temperature resistance by using high-temperature PCBs, packaging, and potting. Due to the large size limitations of downhole instruments, high-power power supplies are inherently bulky and cannot achieve their temperature resistance targets solely through physical heat conduction. (CN202410884995.6 A high-power thick-film three-dimensional stacked power supply module and device) A failure in a high-power power supply can cause significant damage to downhole instruments; therefore, constant monitoring of the power output is necessary. Summary of the Invention
[0006] This application provides a high-temperature downhole instrument power supply for detecting cable head voltage, output voltage, current, and power supply temperature during actual logging processes.
[0007] This application provides a high-temperature downhole instrument power supply, comprising: a transformer, a rectifier bridge, and a capacitor board connected in sequence, wherein...
[0008] The transformer is used for voltage conversion;
[0009] The rectifier bridge is used to convert alternating current (AC) to direct current (DC).
[0010] The capacitor plate is used for filtering.
[0011] In the above technical solution, by setting up a transformer, a rectifier bridge, and a capacitor board connected in sequence, the transformer is used for voltage conversion; the rectifier bridge is used for converting AC power to DC power; and the capacitor board is used for filtering. This provides a high-power downhole instrument power supply for use in ultra-high temperature environments, which can monitor the output voltage, output current, core component temperature, and cable head voltage of the downhole instrument power supply in real time.
[0012] In one specific implementation scheme, a power detection circuit is also included, wherein...
[0013] The power supply detection circuit includes an AC voltage detection circuit for detecting the voltage value at the input terminal of the transformer.
[0014] In one specific implementation scheme, the AC voltage detection circuit includes:
[0015] Voltage transformer circuits are used to convert high-voltage alternating current into low-voltage alternating current.
[0016] An absolute value circuit is used to convert the low-voltage alternating current into direct current.
[0017] In one specific implementation, the power supply detection circuit includes a DC voltage detection circuit for detecting the voltage value at the output terminal of the capacitor plate.
[0018] In one specific implementation, the power detection circuit includes a data acquisition and control circuit for performing storage control and transmission of linear monitoring data.
[0019] In one specific implementation, the acquisition control circuit includes a signal acquisition and conditioning module for filtering, A / D acquisition, and data buffering.
[0020] In one specific implementation, the acquisition control circuit includes a data processing module for acquiring timing data generation and data buffering, and auxiliary signal measurement.
[0021] In one specific implementation, the acquisition and control circuit includes a control module for communication between the downhole power supply and the surface system.
[0022] In one specific implementation scheme, the acquisition and control circuit includes a power supply module, wherein,
[0023] The power module includes a circuit power supply and a reference power supply.
[0024] In one specific implementation, the acquisition control circuit includes a temperature acquisition module for acquiring the temperature signal of the power supply. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the structure of a high-temperature downhole instrument power supply provided in an embodiment of this application;
[0026] Figure 2 This is a hardware block diagram of the detection circuit provided in an embodiment of this application;
[0027] Figure 3 This is a hardware block diagram of the conditioning circuit provided in an embodiment of this application;
[0028] Figure 4 This is a schematic diagram of a differential operational amplifier circuit provided in an embodiment of this application;
[0029] Figure 5 This is a schematic diagram of a voltage transformer circuit provided in an embodiment of this application;
[0030] Figure 6 A schematic diagram of an absolute value circuit provided in an embodiment of this application;
[0031] Figure 7 A circuit diagram of a CAN communication module provided in an embodiment of this application;
[0032] Figure 8 An AD acquisition circuit diagram provided for an embodiment of this application;
[0033] Figure 9 This is a schematic diagram of the AD and FPGA interface provided in an embodiment of this application;
[0034] Figure 10 The flowchart illustrates the operation control of the high-temperature downhole instrument power supply provided in this embodiment.
[0035] Among them, 1-transformer, 2-rectifier bridge, 3-capacitor board. Detailed Implementation
[0036] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present application will become clearer and more apparent.
[0037] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.
[0038] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.
[0039] To facilitate understanding of the high-temperature downhole instrument power supply provided in this application embodiment, its application scenario is first explained. The high-temperature downhole instrument power supply provided in this application embodiment is used to detect cable head voltage, output voltage, current, and power supply temperature during actual logging operations. The battery-powered logging instrument power supply is a crucial component of the logging instrument, responsible for providing a stable and reliable power supply. In deep well drilling, such as at depths of tens of thousands of meters, the requirements for the logging instrument power supply are even more stringent due to factors such as well depth and complex geological conditions. The logging instrument power supply needs to be resistant to high temperatures and high pressures. In deep well drilling, such as at depths of tens of thousands of meters, the downhole temperature and pressure are extremely high, requiring the power supply to withstand these extreme environments to ensure the normal operation of the instrument. The power supply needs to be highly efficient and have a long lifespan. During long-term drilling, the power supply needs to continuously and stably provide power to the instrument while maintaining high efficiency to reduce energy waste. Furthermore, the power supply's lifespan needs to be long enough to reduce the frequency of replacement and maintenance, thereby lowering drilling costs. The logging instrument power supply also needs to have intelligent management functions. By monitoring and controlling the power supply status in real time, a stable output voltage and current are maintained to ensure the normal operation of the logging instrument. Commonly used power supplies for logging instruments include linear power supplies and switching power supplies. Linear power supplies offer stable output and low ripple, along with a simple circuit structure. They are suitable for high ambient temperatures, but high-power linear voltage regulation circuits are difficult to implement. Switching power supplies have high conversion efficiency and small size, but due to temperature limitations of components such as PWM chips and switching transistors, they cannot be directly used in ultra-high temperature environments and must be placed in a thermos in logging instruments. Therefore, this application provides a high-temperature downhole instrument power supply to detect cable head voltage, output voltage, current, and power supply temperature during actual logging processes. The following detailed description, in conjunction with specific accompanying drawings, illustrates the embodiments.
[0040] refer to Figures 1 to 10 , Figure 1 This is a schematic diagram of the structure of a high-temperature downhole instrument power supply provided in an embodiment of this application; Figure 2 This is a hardware block diagram of the detection circuit provided in an embodiment of this application; Figure 3 This is a hardware block diagram of the conditioning circuit provided in an embodiment of this application; Figure 4 This is a schematic diagram of a differential operational amplifier circuit provided in an embodiment of this application; Figure 5This is a schematic diagram of a voltage transformer circuit provided in an embodiment of this application; Figure 6 A schematic diagram of an absolute value circuit provided in an embodiment of this application; Figure 7 A circuit diagram of a CAN communication module provided in an embodiment of this application; Figure 8 An AD acquisition circuit diagram provided for an embodiment of this application; Figure 9 This is a schematic diagram of the AD and FPGA interface provided in an embodiment of this application; Figure 10 The flowchart illustrates the operation control of the high-temperature downhole instrument power supply provided in this embodiment.
[0041] exist Figure 1 In this application embodiment, a high-temperature downhole instrument power supply is provided, comprising: a transformer 1, a rectifier bridge 2, and a capacitor board 3 connected in sequence, wherein...
[0042] The transformer is used for voltage conversion;
[0043] The rectifier bridge is used to convert alternating current (AC) to direct current (DC).
[0044] The capacitor plate is used for filtering.
[0045] In the above technical solution, by setting up a transformer, a rectifier bridge, and a capacitor board connected in sequence, the transformer is used for voltage conversion; the rectifier bridge is used for converting AC power to DC power; and the capacitor board is used for filtering. This provides a high-power downhole instrument power supply for use in ultra-high temperature environments, which can monitor the output voltage, output current, core component temperature, and cable head voltage of the downhole instrument power supply in real time.
[0046] refer to Figures 2 to 10 In one specific implementation scheme, a power detection circuit is also included, wherein,
[0047] The power supply detection circuit includes an AC voltage detection circuit for detecting the voltage value at the input terminal of the transformer.
[0048] In one specific implementation scheme, the AC voltage detection circuit includes:
[0049] Voltage transformer circuits are used to convert high-voltage alternating current into low-voltage alternating current.
[0050] An absolute value circuit is used to convert the low-voltage alternating current into direct current.
[0051] In one specific implementation, the power supply detection circuit includes a DC voltage detection circuit for detecting the voltage value at the output terminal of the capacitor plate.
[0052] In one specific implementation, the power detection circuit includes a data acquisition and control circuit for performing storage control and transmission of linear monitoring data.
[0053] In one specific implementation, the acquisition control circuit includes a signal acquisition and conditioning module for filtering, A / D acquisition, and data buffering.
[0054] In one specific implementation, the acquisition control circuit includes a data processing module for acquiring timing data generation and data buffering, and auxiliary signal measurement.
[0055] In one specific implementation, the acquisition and control circuit includes a control module for communication between the downhole power supply and the surface system.
[0056] In one specific implementation scheme, the acquisition and control circuit includes a power supply module, wherein,
[0057] The power module includes a circuit power supply and a reference power supply.
[0058] In one specific implementation, the acquisition control circuit includes a temperature acquisition module for acquiring the temperature signal of the power supply.
[0059] Specifically, the power supply for the high-temperature downhole instrument includes: a transformer, a rectifier bridge, and a capacitor board.
[0060] In the above scheme, the transformer converts the voltage at the downhole instrument cable head to the voltage value required by the instrument. To meet the high power requirements, the transformer is connected in parallel with the same terminals, and this part is directly fixed to the instrument frame. It also meets the withstand voltage values of the rectifier bridge and filter board capacitors. The transformer output voltage is converted into a suitable DC voltage through the rectifier bridge and capacitor board.
[0061] In the above scheme, the rectifier bridge is used to convert AC power to DC power, and this part is equipped with heat sinks and then fixed to the instrument frame.
[0062] In the above scheme, the capacitor plate is used for filtering, including a discharge resistor. The capacitors on the capacitor plate need to meet the rectified voltage value under high temperature conditions, and the resistors are selected to meet their rated power at maximum output. This part is placed inside a thermos.
[0063] In the above scheme, the power supply detection circuit mainly includes an AC voltage detection circuit, a DC voltage detection circuit, and a data acquisition and control circuit.
[0064] In the above scheme, the AC voltage detection circuit is mainly used at the transformer input end, i.e., to detect the voltage value of the logging instrument cable head. If the voltage value is too low, it will not meet the power supply requirements, and some instruments with push-to-close functions will not be able to perform the push-to-close action. If the voltage value is too high, it will break down the power supply capacitor and the power supply of the downhole instruments.
[0065] In the above scheme, the AC voltage detection circuit mainly includes the following parts: a voltage transformer circuit and an absolute value circuit. The voltage transformer circuit converts high-voltage AC to low-voltage AC, and then the absolute value circuit converts the AC to DC.
[0066] In the above scheme, the DC voltage detection circuit is mainly used at the output end of the filter board, that is, to detect the final output voltage of the power supply. In the actual measurement process, the load will cause a voltage drop, so the output voltage needs to be monitored in real time. The DC voltage detection circuit converts the measured DC voltage into a DC voltage signal suitable for the signal processing circuit.
[0067] In the above scheme, the acquisition and control circuit consists of a signal acquisition and conditioning module, a data processing module, a control module, and a power supply module. The signal acquisition and conditioning module includes filtering, A / D acquisition, and data buffering functions; the data processing module includes acquisition timing generation, data buffering, and auxiliary signal measurement functions; the control module is used for communication between the downhole power supply and the surface system; and the power supply module includes a circuit power supply and a reference power supply.
[0068] In the above scheme, the conditioning module adopts conditioning circuits, including DC voltage conditioning circuit, AC voltage conditioning circuit, current conditioning circuit and temperature conditioning circuit, to condition the voltage, current and temperature output signals into signals suitable for signal processing circuits. The high-temperature ADC chip and related software program are used to collect the linear power supply output voltage data, current data and temperature data.
[0069] In the above scheme, the acquisition and control circuit completes all storage, control and transmission functions of linear monitoring, mainly including: 1) Communication, mainly including CAN communication, receiving and sending commands, decoding commands, and storing and reading the acquired data; 2) Acquisition, mainly including acquiring data such as voltage and current of linear power supply for each channel; 3) Calculation, calculating the measured voltage and current values in real time based on the acquired data, and testing the temperature performance of the power supply; 5) Determining whether the linear power supply is working normally based on the voltage, current and temperature monitoring data.
[0070] The above solution can provide 100W downhole power and can be used in ultra-high temperature downhole environments; it can record the current, voltage and temperature of the power supply at different locations during the process of bringing the high temperature downhole instrument power supply to the well, enabling long-term monitoring during power supply testing; and it can monitor the power supply output voltage, output current and internal temperature in real time during ground testing.
[0071] Those skilled in the art will know that this application can be implemented as a system, method, or computer program product.
[0072] Therefore, this disclosure can be implemented in the following forms: it can be entirely hardware, entirely software (including firmware, resident software, microcode, etc.), or a combination of hardware and software, generally referred to herein as a "circuit," "module," or "system." Furthermore, in some embodiments, this application can also be implemented as a computer program product in one or more computer-readable media, which contains computer-readable program code.
[0073] Any combination of one or more computer-readable media may be used. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.
[0074] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application. Based on this, various substitutions and improvements can be made to this application, all of which fall within the protection scope of this application.
Claims
1. A high-temperature downhole instrument power supply, characterized in that, include: The transformer, rectifier bridge, and capacitor board are connected in sequence. The transformer is used for voltage conversion; The rectifier bridge is used to convert alternating current (AC) to direct current (DC). The capacitor plate is used for filtering.
2. The high-temperature downhole instrument power supply according to claim 1, characterized in that, It also includes a power detection circuit, in which, The power supply detection circuit includes an AC voltage detection circuit for detecting the voltage value at the input terminal of the transformer.
3. The high-temperature downhole instrument power supply according to claim 2, characterized in that, The AC voltage detection circuit includes: Voltage transformer circuits are used to convert high-voltage alternating current into low-voltage alternating current. An absolute value circuit is used to convert the low-voltage alternating current into direct current.
4. The high-temperature downhole instrument power supply according to claim 3, characterized in that, The power supply detection circuit includes a DC voltage detection circuit for detecting the voltage value at the output terminal of the capacitor plate.
5. The high-temperature downhole instrument power supply according to claim 4, characterized in that, The power detection circuit includes a data acquisition and control circuit for storing, controlling, and transmitting linear monitoring data.
6. The high-temperature downhole instrument power supply according to claim 5, characterized in that, The acquisition control circuit includes a signal acquisition and conditioning module for filtering, A / D acquisition, and data buffering.
7. The high-temperature downhole instrument power supply according to claim 6, characterized in that, The acquisition control circuit includes a data processing module for acquiring timing data generation and data buffering, and auxiliary signal measurement.
8. The high-temperature downhole instrument power supply according to claim 7, characterized in that, The acquisition and control circuit includes a control module for communication between the downhole power supply and the surface system.
9. The high-temperature downhole instrument power supply according to claim 8, characterized in that, The acquisition and control circuit includes a power supply module, wherein... The power module includes a circuit power supply and a reference power supply.
10. The high-temperature downhole instrument power supply according to claim 9, characterized in that, The acquisition and control circuit includes a temperature acquisition module for acquiring the temperature signal of the power supply.