Thin-Layer Spectroelectrochemical Cell for Subterranean Fluid Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional spectroscopic methods for analyzing formation fluids in subterranean operations face challenges in detecting species that produce weak optical signals, limiting the understanding of formation fluid composition and reservoir conditions.
Innovation Solution
A thin-layer spectroelectrochemical cell integrated with a potentiostat, electromagnetic radiation source, and detector is used, which incorporates a working electrode, counter electrode, and reference electrode, along with a fluid mixer, to enhance signal detection by applying a voltage potential and using coordinating ligands to improve molar absorptivity differences between reduced and oxidized species.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional spectroscopy techniques are used to analyze formation fluids, then the analysis method is simple and equipment is straightforward, but detection sensitivity is insufficient for species producing weak optical signals
Solution Approach 1:
The patent combines spectroscopy and electrochemistry into a single integrated spectroelectrochemical cell. The cell contains both optical components (for spectroscopic detection) and electrochemical components (electrodes, potentiostat) within the same device, allowing simultaneous optical measurement and electrochemical reaction enhancement without requiring separate systems.
Solution Approach 2:
The patent changes the physical parameter of the sample path length by using a thin-layer cell design with a very short optical path (on the order of micrometers). This parameter change enhances the absorption signal for species with weak optical signals by concentrating them in a thinner layer, thereby improving detection sensitivity without increasing overall device complexity.
2Loss of information
If traditional spectroscopy is used, then equipment simplicity is maintained, but the ability to detect species with weak optical signals is limited
Solution Approach 1:
The patent merges spectroscopic detection with electrochemical reaction enhancement in a single cell structure. The electrochemical reactions occur at electrodes within the optical path, transforming species to enhance their optical signals, while the spectroscopic system simultaneously monitors these transformations, preventing information loss about formation fluid composition.
Solution Approach 2:
The patent uses coordinating ligands as intermediaries that bind to metal ions in the formation fluids. These ligands enhance the molar absorptivity differences between reduced and oxidized species, acting as a mediator that amplifies the optical signal without interfering with the fundamental detection mechanism.
3Measurement precision
If a thin-layer cell design is used, then detection sensitivity is improved, but the cell volume is reduced
Solution Approach 1:
The patent changes the key parameter of optical path length from millimeter scale to micrometer scale by implementing a thin-layer cell design. This dramatic parameter reduction in the sample thickness compensates for the small cell volume by concentrating the analyte in a thinner layer, thereby enhancing absorption signals and improving detection sensitivity despite the reduced overall volume.
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 allows for more accurate and informative analysis of formation fluids, enabling better decision-making in completion and production processes, and enhancing formation productivity by improving detection sensitivity.
Implementation Method 1
an electromagnetic radiation source that emits electromagnetic radiation into the optical path through the transparent sample window, wherein the electromagnetic radiation optically interacts with a sample in the optical path to generate modified electromagnetic radiation
Implementation Method 2
a potentiostat that applies a voltage potential across the transparent sample window to drive an electrochemical reaction between a detection species and a sample in the transparent sample window fluid
Data Source
AI summary
Apparatus, methods, and systems related to a spectroelectrochemical cell apparatus including a cell body that has a first volume, a transparent sample window defined in the cell body, the transparent sample window defining an optical path through the cell body and having a second volume, a working electrode extending through the cell body and into the transparent sample window in the optical path, a counter electrode extending through the cell body, a reference electrode extending through the cell body, a sample inlet extending through the cell body, a solvent inlet extending through the cell body, an electrolyte inlet extending through the cell body, an ionic fluid inlet extending through the cell body, a detection species inlet extending through the cell body, a fluid outlet extending through the cell body, and a fluid mixer located within the cell body.