Lanthanide Luminescence for Scale Inhibitor Analysis
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Solution Overview
Problem
Current analytical techniques for determining scale inhibitor concentrations in oilfield samples are not sufficiently accurate, simple, or fast, especially when dealing with multiple scale inhibitors in mixed oil well fluids, leading to potential harmful scale formation and inefficient squeeze treatment cycles.
Innovation Solution
A method utilizing time-resolved luminescence signals from lanthanide(III) ions, such as europium, to accurately determine the concentration of scale inhibitors, allowing for individual or combined detection, and optionally complemented with other techniques for precise measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If inductively coupled plasma (IPC), high-performance liquid chromatography (HPLC) or liquid chromatography-mass spectrometry (LC-MS) are used for determining scale inhibitor concentration, then measurement precision is improved, but device complexity and loss of time increase
Solution Approach 1:
The patent introduces a fluorescently labeled scale inhibitor as an intermediary substance that mimics the behavior of conventional scale inhibitors. This labeled inhibitor serves as a detectable proxy, allowing concentration measurements through fluorescent spectroscopy rather than complex IPC, HPLC, or LC-MS systems. The labeled inhibitor interacts with calcium ions similarly to conventional inhibitors, maintaining measurement relevance while enabling simpler detection methodology.
Solution Approach 2:
The patent replaces complex mechanical/chemical separation systems (HPLC columns, mass spectrometers) with an optical detection system based on fluorescent spectroscopy. By substituting the detection mechanism from physical separation and mass analysis to optical signal measurement, the system achieves comparable precision with significantly reduced device complexity and faster analysis time.
2Measurement precision
If conventional analytical techniques are used for determining scale inhibitor concentration, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent replaces time-consuming HPLC separation and LC-MS analysis with rapid fluorescent spectroscopy measurement. The fluorescently labeled scale inhibitor allows direct optical detection without complex sample preparation, separation, or identification steps, reducing analysis time from hours to minutes while maintaining measurement precision through the fluorescent signal intensity correlation with concentration.
Solution Approach 2:
The patent incorporates the fluorescent label into the scale inhibitor molecule beforehand, during the inhibitor formulation stage. This preliminary action ensures that the inhibitor is already equipped with detection capability, eliminating the need for post-application labeling or complex sample preparation steps, thereby enabling rapid analysis without compromising measurement accuracy.
3Productivity
If different scale inhibitors are injected into different oil wells and mixed fluids are produced, then productivity is improved through multiple wells, but measurement precision deteriorates due to inability to determine individual inhibitor concentrations
Solution Approach 1:
The patent segments the scale inhibitor population by introducing fluorescent labels with distinct emission characteristics for different inhibitor types or formulations. Each labeled inhibitor variant can be individually identified and quantified in the mixed produced fluids through spectral differentiation, allowing precise determination of each inhibitor's concentration despite physical mixing in the produced fluids.
Solution Approach 2:
The patent utilizes fluorescent emission wavelength differentiation (analogous to color changes) to distinguish between different scale inhibitor types in mixed samples. Each fluorescently labeled inhibitor emits at characteristic wavelengths, enabling simultaneous detection and quantification of multiple inhibitor types in the mixed produced fluids through spectral analysis, thereby maintaining measurement precision while supporting multi-well production.
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 method provides a reliable, fast, and sensitive means to determine scale inhibitor concentrations, enabling timely and precise squeeze treatment cycles, even at low concentration levels, and is applicable across various industrial water systems.
Implementation Method 1
a time-resolved luminescence signal from an interacted reagent, which comprises a lanthanide(III) ion, such as europium, excited at a first wavelength
Data Source
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AI summary
The invention relates to a method for analysing a sample comprising at least a first and a second scale inhibitor, which scale inhibitors are synthetic organic compounds comprising at least one ionised group. The method comprises optionally diluting and/or purifying the sample, and allowing the sample interact with a reagent comprising lanthanide(III) ion. The sample is excited at a first excitation wavelength and a sample signal deriving from the lanthanide(III) ion is detected at a signal wavelength by using time-resolved luminescence measurement. The total concentration of the first and the second scale inhibitor is determined by using the detected sample signal, and the concentration of the first scale inhibitor in the sample is determined. The concentration of the second scale inhibitor is determined mathematically by using the obtained results for the total concentration and for the first scale inhibitor concentration.