CN-122026733-A - High-temperature downhole instrument power supply

Abstract

The application provides a high-temperature downhole instrument power supply which comprises a transformer, a rectifier bridge and a capacitor plate, wherein the transformer, the rectifier bridge and the capacitor plate are electrically connected in sequence, the transformer is used for voltage conversion, the rectifier bridge is used for converting alternating current into direct current, and the capacitor plate is used for filtering. In the technical scheme, the high-power downhole instrument power supply applied to the ultra-high temperature environment is provided, and the downhole instrument power supply output voltage, the output current, the core device temperature and the cable head voltage can be monitored in real time.

Inventors

• ZHANG RUOXI
• WANG YUXING
• GUO QINGMING
• YANG JUPENG
• LI YAMIN
• LI ZUO
• WANG JIAJING

Assignees

• 中国石油天然气集团有限公司
• 中国石油集团测井有限公司

Dates

Publication Date

20260512

Application Date

20241111

Claims (10)

1. 1. A high-temperature downhole instrument power supply is characterized by comprising a transformer, a rectifier bridge and a capacitor plate which are electrically connected in sequence, The transformer is used for performing voltage conversion; the rectifier bridge is used for converting alternating current into direct current; the capacitor plate is used for filtering.
2. 2. The high temperature downhole tool power supply of claim 1, further comprising a power detection circuit, wherein, The power supply detection circuit comprises an alternating voltage detection circuit and is used for detecting the voltage value of the input end of the transformer.
3. 3. The high temperature downhole tool power supply of claim 2, wherein the ac voltage detection circuit comprises: A voltage transformer circuit for converting high-voltage alternating current into low-voltage alternating current, And the absolute value circuit is used for converting the low-voltage alternating current into direct current.
4. 4. A high temperature downhole tool power supply according to claim 3, wherein the power supply detection circuit comprises a direct voltage detection circuit for voltage value detection at the output of the capacitive plate.
5. 5. The high temperature downhole tool power supply of claim 4, wherein the power detection circuit comprises an acquisition control circuit for performing linear monitoring of storage control and transmission.
6. 6. The high temperature downhole tool power supply of claim 5, wherein the acquisition control circuit comprises a signal acquisition and conditioning module for filtering, a/D acquisition, and data caching.
7. 7. The power supply of high temperature downhole equipment of claim 6, wherein the acquisition control circuit comprises a data processing module for acquisition timing generation and data caching, auxiliary signal measurement.
8. 8. The high temperature downhole tool power supply of claim 7, wherein the acquisition control circuit comprises a control module for communicating with a surface system.
9. 9. The high temperature downhole tool power supply of claim 8, wherein the acquisition control circuit comprises a power module, wherein, The power module comprises a circuit power supply and a reference power supply.
10. 10. The high temperature downhole tool power supply of claim 9, wherein the acquisition control circuit comprises a temperature acquisition module for acquiring a temperature signal of the power supply.

Description

High-temperature downhole instrument power supply Technical Field The application relates to the technical field of petroleum and natural gas exploration and development, in particular to a high-temperature downhole instrument power supply. Background The battery logging instrument power supply is an important component in the logging instrument and is responsible for providing stable and reliable power supply for the instrument. In deep well drilling such as a myriametric well, the requirements on the power supply of a logging instrument are more severe due to factors such as complex well depth and geological conditions. The logging instrument power supply needs to have high temperature and high voltage resistance. In deep well drilling such as a myriametric well, the downhole temperature and pressure are very high, which requires the power supply to withstand these extreme environments and ensure proper operation of the instrument. The power supply needs to have high efficiency and long life. In the long-time drilling process, the power supply needs to continuously and stably supply power to the instrument, and meanwhile, the high efficiency is maintained, and the energy waste is reduced. In addition, the life of the power supply needs to be long enough to reduce the frequency of replacement and maintenance, reducing drilling costs. The logging instrument power supply also needs to have an intelligent management function. Through the real-time monitoring and regulation of the power state, stable output voltage and current are maintained so as to ensure the normal operation of the logging instrument. The types of the power supply of the common logging instrument comprise a linear power supply and a switching power supply, the linear power supply is stable in output and low in ripple, meanwhile, the linear power supply circuit is simple in structure, the linear power supply can be suitable for high ambient temperature, and a high-power linear voltage stabilizing circuit is difficult to realize. The switching power supply has higher conversion efficiency and smaller volume, but can not be directly applied to an ultra-high temperature environment due to the temperature limitation of components such as a PWM chip, a switching tube and the like, and is required to be placed in a vacuum flask in a logging instrument. (Patent: CN201110428047.4 is a high-temperature power supply method, CN201210547504.6 is a small-volume high-temperature power supply, CN201711244478.9 is a high-temperature power supply module circuit, and CN201410847822.3 is a high-temperature power supply for petroleum well logging) most high-temperature power supplies adopt modes of high-temperature PCB, packaging, glue filling and the like to realize high-temperature resistance of the power supply. Because the volume of the underground instrument is limited greatly, for a high-power supply, the volume of the power supply is large, and the temperature resistance index cannot be realized only by a physical heat conduction mode. (CN 202410884995.6 a high power thick film three-dimensional stacked power supply module and apparatus) there is a large damage to downhole instruments when high power supply fails, so it is necessary to monitor the power supply output at all times. Disclosure of Invention The application provides a high-temperature downhole instrument power supply which is used for detecting cable head voltage, output voltage, current and power supply temperature in the actual logging process. The application provides a high-temperature downhole instrument power supply, which comprises a transformer, a rectifier bridge and a capacitor plate which are electrically connected in sequence, The transformer is used for performing voltage conversion; the rectifier bridge is used for converting alternating current into direct current; the capacitor plate is used for filtering. According to the technical scheme, the transformer, the rectifier bridge and the capacitor plate are electrically connected in sequence, the transformer is used for voltage conversion, the rectifier bridge is used for converting alternating current into direct current, the capacitor plate is used for filtering, and the high-power downhole instrument power supply applied to the ultra-high temperature environment is provided and can be used for monitoring the output voltage, the output current, the core device temperature and the cable head voltage of the downhole instrument power supply in real time. In a specific embodiment, the device further comprises a power supply detection circuit, wherein, The power supply detection circuit comprises an alternating voltage detection circuit and is used for detecting the voltage value of the input end of the transformer. In a specific embodiment, the ac voltage detection circuit includes: A voltage transformer circuit for converting high-voltage alternating current into low-voltage alternating current, And the absolute value circuit is