A multi-channel signal acquisition circuit for downhole power system parameter measurement

Abstract

The invention provides a multi-channel signal acquisition circuit for downhole power system parameter measurement. The multi-channel signal acquisition circuit comprises a micro-processor, a parameter acquisition circuit, a storage circuit, a clock circuit, a resetting circuit and a computer. The micro-processor is connected with the parameter acquisition circuit, the storage circuit, the clock circuit, the resetting circuit and the computer. The signal acquisition circuit added in a power supply of an intelligent drilling tool can monitor the working state of a downhole power system, record the voltage and current change condition of each link of the power system, provide objective and authentic measured data for the fault analysis and maintenance of the power system of the intelligent drilling tool, prevent hidden danger of fault misjudgment and risk oversight caused by single ground detection, shorten the maintenance period of the intelligent drilling tool, improve the safety and stability of downhole work of the intelligent drilling tool and prolong the service life of the intelligent drilling tool.

Description

technical field [0001] The invention relates to a signal acquisition circuit for measuring parameters of an underground power supply system, in particular to a multi-channel signal acquisition circuit for measuring parameters of an underground power supply system. Background technique [0002] In the field of oil drilling, intelligent drilling tools use electronic control units to complete the collection, processing and decision-making of downhole information, and the drive unit completes the corresponding operations. The power source of electronic control units, drive units and other components is supplied by the downhole power system. The quality of the working conditions will directly affect whether the intelligent drilling tools can work safely, normally and stably. [0003] Due to the high bottom temperature, large vibration, and harsh working conditions, smart drilling tools mostly use mud turbine generators to generate AC power. Due to large fluctuations in mud flow, ...

AI Technical Summary

Problems solved by technology

[0003] Due to the high bottom temperature, large vibration, and harsh working conditions, smart drilling tools mostly use mud turbine generators to generate AC power. Due to large fluctuations in mud flow, the AC power generated has a wide range of changes. Therefore, regulated power supply technology is usually used to convert AC power into stable DC power that meets the needs of electrical loads. However, this AC-DC-DC conversion power supply scheme has a complex structure and involves many intermediate links. Any A problem in one link may cause abnormal output voltage. If there is no real-time monitoring and recording of the key node parameters of the downhole power system, it will inevitably lead to difficulties in troubleshooting and difficulty in completely eliminating potential safety hazards, thereby prolonging the maintenance cycle of intelligent drilling tools and reducing intelligence. Safety, stability and service life of drilling tools

In the complex working environment at the bottom of the well, it is necessary to complete the collection, processing, and storage functions of multiple power parameters, and the stability and reliability of the existing voltage / current signal acquisition circuits are difficult to meet the requirements.

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