Optical Spectrometer Dynamic Range Determination
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Solution Overview
Problem
Current downhole tools with optical spectrometers face challenges in accurately determining the optical density linear dynamic range, which is crucial for characterizing downhole fluids, due to variations in lamp intensities and errors in optical density measurements.
Innovation Solution
The technique involves acquiring dry and wet condition measurements using an optical spectrometer for various lamp currents, determining candidate maximum optical densities based on a reference measurement, and calculating optical density linear dynamic range by accounting for errors in these measurements, ensuring accurate characterization of downhole fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If lamp intensity is increased to improve signal strength, then measurement sensitivity is improved, but measurement precision deteriorates due to optical density saturation
Solution Approach 1:
The patent applies dynamics by making the lamp current adjustable and variable during measurements. The system dynamically changes lamp current intensity based on the specific measurement requirements and optical density range being measured, allowing optimization of both signal strength and linearity for different measurement conditions.
Solution Approach 2:
The patent changes the lamp current parameter to determine candidate maximum optical densities at different current levels. By varying this key parameter and selecting appropriate values based on determined ranges, the system optimizes measurement accuracy while maintaining linearity across different fluid characterization scenarios.
2Ease of operation
If a fixed reference measurement is used to simplify the measurement process, then ease of operation is improved, but measurement precision deteriorates due to lamp intensity variations
Solution Approach 1:
The patent changes the reference measurement approach by performing reference measurements at multiple lamp current values rather than using a single fixed reference. This allows the system to account for lamp intensity variations and determine accurate candidate maximum optical densities while maintaining operational simplicity through automated multi-point reference acquisition.
3Measurement precision
If measurements are taken at multiple lamp currents to improve accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback by using determined candidate maximum optical densities to inform subsequent measurement decisions. The system measures at multiple lamp currents, determines optimal ranges based on results, and uses this feedback to guide future measurements, reducing the need for excessively complex multi-point measurements in all scenarios.
Solution Approach 2:
The patent performs preliminary reference measurements at various lamp currents to establish candidate maximum optical densities before actual fluid measurements. This preliminary characterization simplifies subsequent measurements by providing pre-determined optimal parameters and ranges for specific measurement conditions.
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
This approach enables precise determination of the optical density linear dynamic range, enhancing the accuracy and reliability of fluid characterization in downhole environments, thereby improving the analysis of hydrocarbon composition and other fluid properties.
Implementation Method 1
The optical spectrometer measures how a downhole fluid interacts with light for purposes of determining information about the fluid
Data Source
AI summary
A technique includes acquiring dry condition and wet measurements using an optical spectrometer for a plurality of lamp intensities. The technique includes determining candidate maximum optical densities as a function of the lamp intensities based at least in part on a reference measurement that is acquired by the spectrometer, the reference measurement and does not vary with respect to the lamp intensities. The technique includes determining an optical density linear dynamic range based at least in part on the candidate maximum optical densities.