Downhole Fluid Spectral Reconstruction via Optical Data Matching
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Solution Overview
Problem
Subsurface optical measurement devices in downhole environments face challenges in accurately reconstructing wideband absorbance spectra due to size limitations and harsh operating conditions, which affects contamination and composition analysis of wellbore fluids.
Innovation Solution
The technology involves obtaining optical data measurements from a subsurface optical measurement device and comparing them to an optical data library to identify a corresponding fluid sample, allowing for the determination of the absorbance spectrum of the subsurface fluid using inversion-based methods and a matching pursuit algorithm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If surface spectral analysis is used to test downhole fluid samples, then fluid composition and contamination levels can be determined, but measurement accuracy deteriorates due to pressure and temperature changes during sample transfer
Solution Approach 1:
The patent performs optical measurements downhole before the fluid sample undergoes pressure and temperature changes during transfer to surface. By conducting the measurement in situ at the measurement location within the wellbore, the system captures spectral data under actual downhole conditions, eliminating the reliability issue of sample degradation during transport while maintaining measurement precision through direct subsurface analysis
2Reliability
If subsurface optical measurements are performed to avoid surface analysis problems, then measurement reliability improves, but device complexity increases due to size limitations and harsh environment requirements
Solution Approach 1:
The patent replaces complex mechanical sampling and handling systems with an optical measurement system that performs spectral analysis in situ. Instead of mechanically retrieving samples and transporting them through complex wellbore equipment, the system uses optical sensors to measure fluid properties directly downhole, substituting mechanical complexity with optical measurement capabilities that are more compact and better suited for harsh environments
Solution Approach 2:
The patent introduces an optical measurement system as an intermediary between the downhole fluid and surface analysis equipment. This intermediary performs preliminary spectral measurements in situ, providing data that eliminates the need for complex mechanical sample handling and transport systems, thereby reducing overall device complexity while maintaining measurement reliability
3Loss of information
If wideband absorbance spectrum measurement is attempted with limited downhole measurements, then complete fluid characterization is achieved, but measurement difficulty increases due to instrument size constraints
Solution Approach 1:
The patent segments the spectral measurement task into multiple discrete wavelength measurements taken at different downhole locations or at different times. Instead of requiring a single complex wideband measurement instrument, the system collects spectral data across multiple wavelength bands using simpler optical components that can be accommodated within size constraints, then reconstructs the complete absorbance spectrum through computational methods
Solution Approach 2:
The patent transitions from attempting to measure the complete wideband spectrum at a single downhole location to collecting spectral measurements across multiple dimensions (different wavelengths, different locations, or different times). This dimensional approach allows reconstruction of complete spectral information using simpler measurement components that fit within size constraints, transforming a single-point complex measurement into a distributed multi-dimensional measurement strategy
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 reliable reconstruction of wideband absorbance spectra from limited downhole measurements, facilitating accurate contamination and composition analysis of wellbore fluids, even in harsh downhole conditions.
Implementation Method 1
obtaining, from a subsurface optical measurement device, a plurality of optical data measurements associated with a subsurface fluid
Data Source
AI summary
Systems and methods are provided for determining the wideband spectrum of downhole fluids based on downhole optical measurements. In some aspects, a plurality of optical data measurements associated with a subsurface fluid can be obtained from a subsurface optical measurement device. In some cases, a comparison can be made between the plurality of optical data measurements associated with the subsurface fluid and one or more sets of optical data stored in an optical data library. In some examples, the one or more sets of optical data can correspond to a plurality of different fluid samples. In some instances, a first fluid sample from the plurality of fluid samples that corresponds to at least a portion of the subsurface fluid can be identified based on the comparison. In some aspects, an absorbance spectrum of the subsurface fluid can be determined based on the first fluid sample.