Solid State Protection Circuits for Downhole Converter Faults
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Solution Overview
Problem
Downhole electronic circuits in hydrocarbon drilling operations are prone to damage from harsh conditions such as overvoltage events, alternator faults, and temperature fluctuations, leading to high repair and maintenance costs due to the lack of effective protection against fault events.
Innovation Solution
The implementation of protection circuits using solid-state blocking devices, such as SiC JFETs and MOSFETs, that can be switched based on sensor detections to block current flow during fault conditions, preventing damage to electronic components and reducing the need for extensive overcurrent protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional protection circuits are used in downhole electronic circuits, then damage from fault events can be prevented, but the device complexity and number of components increase significantly
Solution Approach 1:
The patent combines multiple protection functions into a single solid state blocking device that can operate in different states (conducting and blocking). This single device replaces what would traditionally require multiple separate protection components, thereby reducing overall device complexity while maintaining comprehensive protection against overvoltage, overcurrent, and other fault conditions.
Solution Approach 2:
The solid state blocking device is designed to perform multiple protection functions simultaneously - it can block overvoltage, overcurrent, and reverse polarity conditions, and can be controlled to protect different portions of the electronic circuit. This multi-functionality eliminates the need for separate dedicated protection devices for each type of fault condition.
2Reliability
If extensive overcurrent protection is implemented, then electronic components are better protected, but the number of blocking devices required increases
Solution Approach 1:
The patent integrates overcurrent protection capability into the solid state blocking device itself, which can operate in conducting or blocking states based on control signals. This eliminates the need for separate overcurrent protection devices, as the same blocking device provides both voltage protection and current protection functions.
Solution Approach 2:
The solid state blocking device includes internal control circuitry that automatically detects fault conditions and switches to blocking state without requiring external protection devices. The device monitors its own operating conditions and self-regulates to prevent damage, reducing the need for additional external protection components.
Data Source
AI summary
An example method may include generating an alternating current (AC) output at a power source within a borehole in a subterranean formation. An electrical component may receive a direct current (DC) output from a converter circuit coupled to the power source and the electrical component. One or more measurements corresponding to the power source, the converter circuit, the electrical component, or a protection circuit coupled to the converter circuit may be received. Blocking devices within the protection circuit may be selectively caused to block current flow in the converter circuit based, at least in part, on the one or more received measurements.