Perforating Gun String Switch Counters to Prevent Misruns
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Solution Overview
Problem
Existing perforating gun systems lack effective mechanisms to track the usage of addressable switches, leading to potential failures and misruns due to overuse, which degrades electronic components and affects the reliability of operations.
Innovation Solution
Implementing a counter system within the perforating gun string to track the number of runs for each addressable switch, including an RT switch, gun switch, and plug switch, using firmware coding to increment counters with each fire command, and providing run tallies via a display or surface tester to prevent overuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If addressable switches are used in perforating gun systems, then operational control and targeting precision are improved, but the risk of overuse and component degradation increases
Solution Approach 1:
The system incorporates counters that provide feedback on the number of times each addressable switch has been fired. This feedback mechanism allows operators to monitor switch usage and prevent overuse, thereby maintaining switch reliability while continuing to benefit from precise targeting control.
Solution Approach 2:
The counter system performs preliminary tracking of switch usage before failures occur. By monitoring and recording the number of firings in advance, the system enables preventive maintenance and replacement decisions, preventing component degradation from leading to system failures.
2Device complexity
If switch usage is not tracked, then device complexity is reduced, but operational reliability deteriorates due to overuse
Solution Approach 1:
The counter system is integrated directly into the switch circuitry, allowing the switches to self-monitor their own usage. This self-service approach provides reliable tracking without requiring external complex monitoring systems, maintaining simplicity while ensuring operational reliability.
Solution Approach 2:
The counter functionality is merged with the existing switch and control circuitry rather than being a separate external system. This integration provides reliable usage tracking while minimizing additional complexity, as the counters share the same physical and electrical infrastructure as the original switch components.
Data Source
AI summary
A perforating gun string includes a release tool, a perforating gun, and a plug. The perforating gun string may include or be part of a downhole tool that is electrically communicable via a control system. A first switch (or “RT switch”) is associated with the release tool and is operably coupled to a first detonator. A second switch (or “gun switch”) is associated with the perforating gun and is operably coupled to a second detonator. A third switch (or “plug switch”) is associated with the plug and is operably coupled to an igniter. A counter system includes a plurality of counters adapted to track usage of one or more switches in the perforating gun string, including the first switch, the second switch, the third switch, or any combination thereof.