Downhole Receiver Protection Circuit for High-Voltage Pulse Peeking
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Solution Overview
Problem
Current downhole logging systems face issues with receiver saturation due to high voltage isolation, leading to inaccurate measurements and prolonged response times.
Innovation Solution
A system and method incorporating a muting circuitry and passive or active high voltage blocking circuitry, along with a high voltage peeking function, to protect receivers from saturation and enable accurate measurement during high voltage firing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high voltage isolation is used to protect receiver circuitry from damage, then receiver protection is improved, but receiver saturation occurs and measurement accuracy deteriorates
Solution Approach 1:
The system divides the receiver path into separate high voltage and low voltage sections using isolation barriers (transformers, optocouplers, or capacitive couplings). This segmentation allows the high voltage firing circuitry to operate independently without directly affecting the low voltage receiver circuitry, thus preventing saturation while maintaining protection.
Solution Approach 2:
An intermediary isolation barrier is introduced between the high voltage firing circuitry and the low voltage receiver circuitry. This intermediary element (transformer, optocoupler, or capacitive coupling) transfers signals while blocking high voltage, preventing receiver saturation while maintaining circuit protection.
2Reliability
If high voltage isolation is used to protect receiver circuitry, then receiver protection is improved, but response time increases due to extended saturation period
Solution Approach 1:
The system dynamically adjusts the coupling characteristics between high voltage and low voltage sections. By using controllable elements (such as variable coupling capacitors or actively controlled isolation barriers), the system optimizes the transient response while maintaining protection, reducing the saturation period and improving response time.
Solution Approach 2:
The isolation barrier parameters (such as coupling capacitance, transformer turns ratio, or optocoupler gain) are optimized to minimize saturation effects. By carefully selecting and adjusting these parameters, the system achieves adequate protection while reducing the duration of receiver saturation, thus improving response time.
3Reliability
If existing protection systems are used, then receiver damage is prevented, but receiver saturation deforms measurements and limits response time
Solution Approach 1:
The system creates an isolated copy of the signal path using transformation elements (transformers or optocouplers). This copied signal path allows the receiver to measure the high voltage firing signal accurately without being exposed to damaging voltage levels, preventing both saturation and damage while maintaining measurement quality.
Data Source
AI summary
A system for high voltage protection may comprise a high voltage protection module electrically connected to a transmitter module and a receiver module and a muting module connected to the high voltage protection module and the receiver module. A method for high voltage protection may comprise disposing a downhole tool into a wellbore, transmitting an excitation signal from the transmitter module to transceiver as a high voltage pulse signal to the high voltage protection module, reducing the high voltage pulse signal with the high voltage protection module, and preventing saturation of the receiver with a low impedance interface from the muting module.