Downhole Fluid Spectroscopy Partial Density
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Solution Overview
Problem
Existing methods for determining the partial density of compounds in downhole fluids are biased by factors other than the absorption by the compound, leading to inaccurate results due to overlapping absorption spectra and interference from other compounds.
Innovation Solution
A method that involves exposing the downhole fluid to electromagnetic radiation, measuring the absorption spectrum, identifying specific absorption peaks, determining a first parameter within the peak and second and third parameters outside the peak, and using a weighted combination to account for biases and accurately calculate the partial density of compounds like carbon dioxide and hydrogen sulfide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional spectroscopic methods are used to determine partial density of compounds in downhole fluids, then the measurement process is simple and quick, but the measurement precision is poor due to absorption peak bias from overlapping spectra and interference from other compounds
Solution Approach 1:
The patent segments the absorption spectrum into multiple wavelength regions, analyzing each region separately to identify and quantify different compounds. By dividing the complex spectral data into manageable segments, the method isolates absorption peaks from individual compounds even when spectra overlap, thereby improving measurement precision without requiring overly complex equipment
Solution Approach 2:
The patent transforms the spectral analysis by changing parameters from direct absorption peak amplitude measurement to a multi-step process involving baseline determination, peak identification, and quantitative analysis using calibrated absorption coefficients. This parameter transformation allows accurate partial density determination by accounting for interference from other compounds through systematic spectral feature analysis
2Reliability
If absorption peak amplitude is used directly to determine partial density, then the calculation is simple, but the reliability is poor due to bias from factors other than compound absorption
Solution Approach 1:
The patent performs preliminary actions by first determining the baseline spectrum and identifying all absorption peaks before quantifying compound concentrations. This preliminary spectral characterization allows the method to account for interference from other compounds and instrumental factors, ensuring reliable results. The preliminary analysis includes establishing reference spectra and calibration curves that speed up subsequent measurements
Solution Approach 2:
The patent implements feedback mechanisms by using identified absorption peaks to inform the quantification process. The measured absorption at each wavelength is compared against reference spectra and calibration data, with the results feeding back into the concentration calculation. This feedback loop ensures that the final partial density values account for all spectral interferences while maintaining analysis efficiency through automated computation
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 provides accurate partial density determinations with differences of no more than 2% by weight compared to reference methods, significantly improving the precision over existing spectroscopic methods which can have differences of up to 10% by weight.
Implementation Method 1
measuring a spectrum of radiation absorption by the downhole fluid
Implementation Method 2
exposing the downhole fluid to electro-magnetic radiation, measuring a spectrum of radiation absorption by the downhole fluid
Data Source
AI summary
An example method for determining a partial density of a compound in a downhole fluid may comprise exposing the downhole fluid to an electromagnetic radiation, and measuring a spectrum of radiation absorption by the downhole fluid. An absorption peak of the compound may be identified in the measured spectrum. A first parameter indicative of radiation absorption by the downhole fluid may be determined in the identified absorption peak. Second and third parameters indicative of radiation absorptions by the downhole fluid may be determined essentially out of the identified absorption peak. A weighted combination of the second and third parameters may be computed, and the partial density of the compound may be determined from a difference between the weighted combination and the first parameter.