Generalized Standard Addition Method for Downhole Fluid Analysis
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Solution Overview
Problem
Spectroscopic analysis in downhole environments faces challenges due to high temperature, high pressure, and vibration, leading to interference in fluid composition analysis, where traditional methods struggle with matrix-dependent responses and limited data from low-resolution spectroscopic components, resulting in inaccurate interpolation and extrapolation.
Innovation Solution
The generalized standard addition method (GSAM) is employed, which involves adding incremental spikes of analytes to fluid samples, using multiple non-specific sensors to determine analyte and interferent concentrations through a system of linear equations, allowing for accurate calibration and concentration profiling despite harsh conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional spectroscopic analysis components are used in downhole environments, then robustness to harsh conditions is improved, but measurement precision deteriorates due to sensitivity to multiple interferents
Solution Approach 1:
The patent segments the spectroscopic analysis into multiple discrete wavelength measurements, each targeting specific analytes. By using multiple sensors at different wavelengths and applying chemometric analysis, the system isolates individual component signals from the complex mixture, resolving the contradiction between robustness and precision.
Solution Approach 2:
The patent employs more sensors and wavelength measurements than the minimum required, creating an over-determined system. This excessive action provides redundant information that enables sophisticated signal processing and interferent rejection, improving measurement precision while maintaining robustness through the redundancy.
2Device complexity
If low-resolution spectroscopic components are used, then device complexity is reduced, but measurement precision deteriorates due to broad spectral signals and limited discrete component isolation
Solution Approach 1:
The patent transitions from temporal or spatial resolution to wavelength-domain resolution by using multiple sensors at distinct wavelengths. This dimensional approach allows discrete component isolation without requiring high temporal or spatial resolution, maintaining simple device architecture while improving measurement precision.
3Measurement precision
If matrix-dependent response calibration is performed, then measurement precision is improved under specific conditions, but adaptability deteriorates when environmental conditions change
Solution Approach 1:
The patent uses chemometric analysis to model and compensate for matrix effects and environmental condition variations. By incorporating multiple wavelength measurements and using multivariate calibration techniques, the system adapts to changing conditions while maintaining measurement precision across different environments.
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
GSAM enables reliable fluid composition prediction across various environments and matrices, providing high-resolution data with reduced need for extensive calibration and sensor characterization, effectively overcoming the limitations of traditional methods.
Implementation Method 1
transmitting energy to the fluid using an energy source coupled to the flow channel; receiving, downstream from an injection point in the flow channel, the energy modified by the fluid as photometric energy
Data Source
AI summary
Apparatus, systems, and methods may operate to discharge a plurality of spike fluids into a fluid flowing in a flow channel, transmit energy to the fluid using an energy source coupled to the flow channel, receive the energy modified by the fluid as photometric energy, convert the photometric energy to at least one photometric signal, compare the at least one photometric signal with a reference signal to determine at least one photometric property of the fluid, and determine at least one component of the fluid using the at least one photometric property supplied to a generalized standard addition method (GSAM). Additional apparatus, systems, and methods, including the use of multivariate curve resolution (MCR) to refine GSAM results, are disclosed.