Microfluidic Device for Inorganic Scale Formation Characterization
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Solution Overview
Problem
Current methods lack a standard laboratory test to accurately detect and measure the onset of inorganic scale formation at high pressure and high temperature reservoir conditions, as sample integrity is compromised during transportation, and existing thermodynamic models require precise water composition data which is difficult to obtain.
Innovation Solution
A microfluidic device with temperature-controlled microchannels and pressure sensors is used to characterize fluid properties by adjusting pressure and temperature, allowing for real-time detection of scale onset conditions, including scale onset pressure and temperature, through iterative pressure and temperature changes and image analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermodynamic models are used for scale prediction, then scale formation can be predicted, but very accurate composition data is required as primary input which is difficult to obtain
Solution Approach 1:
The patent replaces complex thermodynamic modeling with a simplified mechanical approach using a microfluidic device. The device directly measures scale formation through pressure differential changes across a membrane, eliminating the need for accurate water composition data while maintaining prediction accuracy. The system substitutes computational complexity with a straightforward physical measurement system.
2Measurement precision
If laboratory tests are conducted to detect scale formation, then scale onset conditions can be measured, but sample integrity is compromised during transportation to the laboratory
Solution Approach 1:
The patent performs the scale detection measurement immediately at the wellsite before sample transportation occurs. The microfluidic device conducts the scale onset test in situ, extracting a small fluid sample and measuring pressure differentials to detect scale formation conditions before any transportation-related composition changes can occur. This preliminary action eliminates sample integrity concerns entirely.
Solution Approach 2:
The patent introduces a semipermeable membrane as an intermediary element in the microfluidic device. The membrane allows selective passage of substances while providing a surface for scale deposition, enabling indirect measurement of scale formation through pressure differential changes without requiring direct observation or analysis of the entire fluid sample composition.
3Loss of information
If large sample volumes are used for conventional PVT measurements, then comprehensive fluid characterization can be achieved, but the complexity and cost of the testing increases
Solution Approach 1:
The patent extracts only the essential measurement function from complex conventional PVT testing. The microfluidic device isolates the scale detection capability, using a tiny fluid sample to measure pressure differentials across a membrane. This extraction approach captures the critical scale formation information without requiring comprehensive fluid characterization through complex multi-parameter testing.
Solution Approach 2:
The patent creates a simplified copy of the scale formation process within the microfluidic device. Instead of replicating full-scale industrial conditions, the device reproduces the essential scale deposition mechanism on a miniature membrane, allowing accurate scale onset detection with minimal sample volume and simplified equipment.
4Measurement precision
If iterative pressure and temperature adjustments are performed to characterize fluid properties, then accurate scale onset conditions can be detected, but the testing time increases
Solution Approach 1:
The patent applies partial action by focusing only on the specific pressure and temperature conditions relevant to scale formation, rather than conducting exhaustive testing across all possible conditions. The microfluidic device performs targeted iterative adjustments only in the vicinity of expected scale onset conditions, reducing unnecessary testing time while maintaining accuracy for the critical parameter range.
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
Enables rapid and accurate detection of scale formation conditions, reducing the need for large sample volumes and providing high-quality data comparable to conventional PVT measurements, suitable for optimizing reservoir fluid production and transportation strategies.
Implementation Method 1
a temperature-controlled surface that is thermally-coupled to the microfluidic device and configured to maintain a temperature of the microchannel
Implementation Method 2
a pressure sensor configured to measure pressure of the fluid in the microchannel
Implementation Method 3
Scale can be caused by precipitation due to a chemical reaction with the surface of such materials, by precipitation caused by chemical reactions in the fluid, by a change in pressure or temperature
Data Source
AI summary
A test method and apparatus employs a microfluidic device to characterize properties of a fluid. The microfluidic device has an inlet port, an outlet port, and a microchannel as part of a fluid path between the inlet port and the outlet port. While a fluid is introduced into the microchannel, the fluid temperature is maintained while the fluid pressure in the microchannel is varied to characterize the properties of the fluid in the microchannel. The properties of the fluid can relate to a scale onset condition of the fluid at the pressure of the flow through the microchannel. In one aspect, fluid pressure in the microchannel is maintained while the fluid temperature is varied to characterize the properties of the fluid. In another aspect, flow rate of the fluid through the microchannel is varied while the fluid temperature is maintained to characterize the properties of the fluid in the microchannel.