Multipoint Gas Input Switching for Methane Leak Detection
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Solution Overview
Problem
Gas extraction sites face leaks from worn-out wellhead components, leading to unintended methane release, posing air quality and safety hazards.
Innovation Solution
A multipoint gas input switching device that alternates gas samples from multiple sources to a single gas analyzer using a multipoint switching algorithm, ensuring efficient analysis and maintaining pressure in gas lines for immediate sensing, while priming another line for subsequent analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple gas sources are connected to a single gas analyzer, then the quantity of gas sources analyzed is improved, but the device complexity increases due to the need for switching mechanisms and multiple valves
Solution Approach 1:
The system divides the gas analysis function into separate temporal segments, where each gas source is analyzed in sequential time slots rather than simultaneously. The switching mechanism segments the gas flow paths using individual valves for each gas source, allowing one valve to be open at a time while others remain closed. This segmentation resolves the contradiction by enabling multiple gas sources to be analyzed through time-based division rather than requiring complex simultaneous handling of all sources.
Solution Approach 2:
The system implements periodic switching between different gas sources using a cyclic algorithm that opens and closes valves in a repeating sequence. Each gas source receives periodic access to the analyzer according to a predetermined schedule. This periodic action allows the system to handle multiple gas sources efficiently by rotating through them in cycles, maintaining simplicity while achieving versatility.
2Productivity
If gas samples are continuously drawn from multiple gas lines, then the productivity of gas analysis is improved, but the pressure in gas lines drops causing sensing delays
Solution Approach 1:
The system uses periodic sampling where the gas analyzer draws samples from gas lines in alternating sequences rather than continuously from all lines simultaneously. By implementing a switching algorithm that activates one gas line at a time in periodic cycles, the system maintains adequate pressure in each gas line during its active sampling window while still achieving high overall productivity through rapid alternation between multiple sources.
Solution Approach 2:
The system performs preliminary pressurization of gas lines before sampling by maintaining closed valves that trap gas pressure in each line during idle periods. Before a gas line is activated for sampling, it has already been pre-pressurized during the interval when its valve was closed and other lines were being sampled. This preliminary action ensures that when sampling begins, sufficient pressure is already present to enable immediate sensing without delays.
3Loss of substance
If a single gas analyzer is used for multiple gas sources, then the loss of equipment is reduced, but the measurement precision may deteriorate due to cross-contamination and pressure variations
Solution Approach 1:
The system extracts gas samples from multiple gas lines through a common switching mechanism that isolates each source individually before introducing it to the analyzer. By extracting samples through controlled valve openings rather than direct continuous connections, the system prevents cross-contamination between gas sources while using a single analyzer. The switching mechanism ensures that only one gas source connects to the analyzer at any given moment, maintaining measurement precision.
Solution Approach 2:
The switching mechanism with individual valves for each gas line acts as an intermediary between the gas sources and the single analyzer. This intermediary component controls the flow path, ensuring that gas from different sources does not mix before reaching the analyzer. The valve system mediates the interaction between multiple sources and one analyzer, maintaining measurement accuracy by preventing cross-contamination while enabling the use of a single analyzer for all sources.
Data Source
AI summary
A gas input switching device (also referred to as a “multipoint system”) receives gas samples from multiple gas sources (e.g., gas wells or other gas source) for testing using a gas analyzer (e.g., a laser sensor). Advantageously, using the multipoint system discussed herein, multiple individual gas sources may be analyzed by a single gas analyzer by alternating input to the gas analyzer between the multiple gas lines, such as according to a multipoint switching algorithm.