Optical Isotope Analysis for Drilling Fluids
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Solution Overview
Problem
Current devices for isotopic analysis of gaseous constituents from drilling fluids require a vibration-free, climate-controlled environment for precise measurements, making on-site analysis at oil or drilling sites impractical due to the need for large and fragile equipment.
Innovation Solution
A device comprising a gas-phase chromatograph and an optical measurement unit with a laser and reflective absorption cavity for on-line analysis of gaseous compounds, allowing for precise isotopic measurements of carbon isotopes in drilling mud without the need for a combustion oven or complex climate control, enabling operation near oil wells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an isotope ratio mass spectrometer (IRMS) is used for precise isotopic measurements, then measurement precision is improved, but device complexity and the need for climate control increase
Solution Approach 1:
The patent replaces the mechanical mass spectrometry system with an optical absorption system using laser or LED light sources. The optical system measures isotopic ratios through differential absorption spectra, eliminating the need for complex mechanical components, vacuum systems, and climate control while maintaining measurement precision.
Solution Approach 2:
The patent changes the measurement parameter from mass-to-charge ratio (in MS) to optical absorption coefficient (in optical system). By tuning the light source wavelength to match specific absorption lines of different isotopes, the system achieves precise isotopic ratio measurement through optical means rather than mechanical separation.
2Measurement precision
If an isotope ratio mass spectrometer (IRMS) is used for precise isotopic measurements, then measurement precision is improved, but the device becomes fragile and requires vibration-free environment
Solution Approach 1:
The patent replaces the mechanical mass spectrometry system with an optical absorption system using laser or LED light sources. The optical system measures isotopic ratios through differential absorption spectra, eliminating the need for complex mechanical components, vacuum systems, and climate control while maintaining measurement precision.
3Adaptability or versatility
If a combustion oven is used for analyzing gaseous constituents, then analysis capability is improved, but device complexity and size increase
Solution Approach 1:
The patent extracts and eliminates the combustion oven from the analysis system. Instead of combusting the sample to convert it to CO2, the system directly introduces the gaseous sample into the optical measurement cell, where isotopic ratios are measured through optical absorption without requiring thermal conversion.
4Measurement precision
If offline analysis in climate-controlled laboratory is used, then measurement precision is improved, but productivity and time efficiency deteriorate
Solution Approach 1:
The patent replaces the mechanical mass spectrometry system with an optical absorption system using laser or LED light sources. The optical system measures isotopic ratios through differential absorption spectra, eliminating the need for complex mechanical components, vacuum systems, and climate control while maintaining measurement precision.
Solution Approach 2:
The patent enables continuous on-site analysis by eliminating the need for sample collection, transport, and laboratory processing. The simplified optical system can be deployed directly at the drilling site, allowing continuous real-time measurement of isotopic ratios in drilling fluids without interrupting the drilling operation.
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, on-line isotopic measurements of gaseous constituents from drilling fluids at oil or drilling sites, maintaining measurement precision and simplifying the instrumentation required for on-site analysis.
Implementation Method 1
a source of optical radiation, in particular a laser or LED whose emission line coincides with an absorption line of the gaseous constituent to be analysed
Implementation Method 2
a source of optical radiation, in particular a laser or LED whose emission line coincides with an absorption line of the gaseous constituent to be analysed
Data Source
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AI summary
This device comprises a means (111) for forming a gaseous flow from the sample and a means (121) for separation of each specific gaseous constituent. It comprises a means (115) for quantifying the relative contents of the two isotopes to be analysed which comprise an optical measurement cell (127). The cell (127) comprises two mirrors (137A, 137B) which delimit a measurement cavity (147). The device comprises a means (161) for introducing an incident optical signal into the measurement cavity (147), a means (161) for generating a plurality of reflections of the signal in separate points (174A, 174B) on each mirror (137A, 137B) during its travel in the cavity, a means (133) for measuring a transmitted optical signal resulting from an interaction between the optical signal and each isotope in the measurement cavity (147), and a means (125) for calculating said relative contents on the basis of these signals.