Selective Gas Chromatography Dilution for Hydrocarbon Detection Windows
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Solution Overview
Problem
Existing gas separation devices are unable to individually dilute chemical samples to the specific concentration ranges required for accurate hydrocarbon analysis, leading to issues such as alkanes like ethane and propane being excluded from detection windows during bulk dilution with methane.
Innovation Solution
A gas chromatography system with separate dilutant instruments and mass flow controllers for each gas separation device, allowing individual hydrocarbon species to be selectively diluted to the appropriate concentration range for accurate analysis, using filters and catalysts to prepare samples for isotopic ratio mass spectrometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bulk dilution with methane is used to adjust concentration, then methane concentration is improved to specified range, but other alkanes (ethane, propane) drop out of detection window
Solution Approach 1:
The patent divides the dilution process into separate segments for different hydrocarbon species. Each gas separation device (chromatograph) has its own dilutant instrument and mass flow controller, allowing independent dilution of methane, ethane, propane, and other alkanes to their respective optimal detection ranges simultaneously, preventing any species from dropping out of the detection window
Solution Approach 2:
The patent transitions from a single-dimension bulk dilution approach to a multi-dimensional selective dilution system. By adding the dimension of species-specific control with individual mass flow controllers and dilutant instruments for each chromatograph, the system can independently adjust concentrations of multiple hydrocarbon species across different detection windows simultaneously
2Adaptability or versatility
If separate dilutant instruments and mass flow controllers are provided for each gas separation device, then selective dilution of individual hydrocarbon species is enabled, but device complexity increases
Solution Approach 1:
The patent employs universal components across multiple gas separation devices. Each chromatograph is equipped with its own dilutant instrument and mass flow controller, creating a modular universal configuration that can be replicated. This allows each device to independently perform selective dilution while maintaining consistent functionality across the system, managing complexity through standardization
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise analysis of hydrocarbons by ensuring all relevant species are within detectable ranges, improving the accuracy of hydrocarbon detection and enabling real-time adjustments to drilling operations based on downhole analysis.
Implementation Method 1
a first gas separation device, the first gas separation device comprising: a first intake device for receiving the gas sample from the formation
Implementation Method 2
analyzing, by the analyzer, the subset of the chemical species to measure an isotopic composition of the at least one first hydrocarbon
Data Source
AI summary
Embodiments of a gas chromatography system and method are disclosed. The method includes injecting a gas sample into a first gas separation device that includes at least one first hydrocarbon identified for analysis; determining that a concentration level of the first hydrocarbon needs to be reduced; diluting the gas sample with a first amount of a dilutant from a first dilutant mass controller; separating out a subset of chemical species from the first diluted gas sample; injecting the gas sample into a second gas separation device, the sample including at least one second hydrocarbon identified for analysis; determining that a concentration level of the second hydrocarbon needs to be reduced; diluting the gas sample with a second amount of the dilutant from a second dilutant mass flow controller; separating out a subset of chemical species from the second diluted gas sample; analyzing the subsets of the diluted samples.