Magnetic Nanoparticle Saturation Profiling in Core Samples
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Solution Overview
Problem
Current methods for estimating saturation levels in coreflooding experiments are prone to errors, which can significantly impact the accuracy of relative permeability data and subsequently affect reservoir performance simulations.
Innovation Solution
A system utilizing hydrophilic magnetic nanoparticles and magnetic field detectors to generate a saturation profile by detecting the magnetic fields produced by these nanoparticles as they are forced through a core sample, allowing for the determination of relative amounts of hydrocarbon and water across the core, along with tracking changes in magnetic field vectors to indicate flow direction and amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to estimate saturation levels in coreflooding experiments, then the process is simple and quick, but the accuracy of saturation profiles and relative permeability data deteriorates
Solution Approach 1:
Hydrophilic magnetic nanoparticles are introduced as an intermediary substance that selectively distributes between water and hydrocarbon phases based on their hydrophilic properties. These nanoparticles serve as tracers that can be detected by magnetic field sensors, enabling indirect but accurate measurement of saturation levels without directly measuring the fluids themselves.
Solution Approach 2:
The patent replaces conventional mechanical or volumetric measurement methods with a magnetic field-based detection system. Magnetic field sensors detect the spatial distribution and concentration of magnetic nanoparticles, converting a fluid saturation measurement problem into a magnetic field detection problem, which provides higher precision and non-intrusive measurement capability.
2Measurement precision
If magnetic nanoparticles are used to detect saturation levels, then measurement accuracy improves, but the system complexity and cost increase
Solution Approach 1:
The magnetic nanoparticles serve multiple functions: they act as phase-selective tracers, magnetic field sources for detection, and flow indicators. The same nanoparticle injection system is used for both saturation measurement and flow direction tracking, reducing the need for separate measurement systems and justifying the added complexity through multi-functionality.
3Reliability
If external factors like salinity are present in the reservoir, then they interfere with conventional measurement methods, but the magnetic nanoparticle method remains accurate
Solution Approach 1:
The patent converts the potential harm of salinity interference into a benefit by using magnetic nanoparticles whose detection method is inherently insensitive to ionic composition. The magnetic properties of the nanoparticles remain unchanged by salinity, while the salinity actually enhances the hydrophilic attraction to water phases, improving phase selectivity and measurement reliability in realistic reservoir conditions.
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 and dynamic saturation profiles, minimizing the impact of external factors like salinity and enabling precise estimation of relative permeability, thereby improving the accuracy of reservoir performance simulations and real-time monitoring of flood-front movement and fluid distribution.
Implementation Method 1
a mixture comprised of water and hydrophilic magnetic nanoparticles is forced through the target to produce a distribution of the mixture and the hydrocarbon
Implementation Method 2
The magnetic field detectors are configured to detect a magnetic field associated with the hydrophilic magnetic nanoparticles
Implementation Method 3
a data processing system is configured to determine a saturation profile of the target based on the magnetic field
Data Source
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AI summary
A system is configured to detect saturation levels of a target, such as a core sample of a reservoir, using magnetic fields generated by hydrophilic magnetic nanoparticles within the target. The target contains both a hydrocarbon, such as oil or gas, and a mixture comprised of water and the hydrophilic magnetic nanoparticles. The system includes magnetic field detectors for spatial distribution across a dimension of the target. The magnetic field detectors are configured to detect a magnetic field associated with the hydrophilic magnetic nanoparticles. A data processing system is configured - for example, programmed - to determine a saturation profile of the target based on the magnetic field.