Microfluidic Separator Using Capillary Membrane
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Solution Overview
Problem
Conventional fluid separation methods in oilfield applications are time-consuming and inefficient, often leaving traces of contaminants, and are not suitable for real-time analysis in subterranean environments, particularly in downhole oilfield settings.
Innovation Solution
A microfluidic device with a membrane that separates multiphase mixtures by maintaining a pressure difference below the capillary break-through pressure, allowing for real-time or near real-time fluid analysis in subterranean environments, using a water-repellant or oil-permeable membrane to efficiently separate liquids or gases without fouling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional separation techniques (gravity separation, centrifugation, hydrocyclone separation) are used, then large quantities of fluids can be separated, but the separation process takes a long time and does not provide real-time analysis
Solution Approach 1:
The patent uses a microporous membrane with lateral dimensions of tens to hundreds of micrometers (a thin film structure) to separate fluid phases. This membrane-based approach enables rapid separation compared to conventional bulk separation methods, allowing real-time or near real-time analysis while maintaining effective phase separation in a compact format.
Solution Approach 2:
The patent transitions from macro-scale bulk separation to micro-scale separation by using a membrane with lateral dimensions in the micrometer range. This dimensional change from macro to micro scale enables much faster separation times while maintaining separation effectiveness, resolving the contradiction between separation capability and analysis time.
2Reliability
If conventional separation techniques are used, then separation can be performed, but traces of contaminants remain in the separated fluid
Solution Approach 1:
The patent employs a microporous membrane as the separation medium. The controlled pore structure of this porous material enables precise phase separation at the micro-scale, achieving complete separation without contaminant traces. The porous structure allows selective passage of specific phases while blocking others, ensuring high separation purity.
3Measurement precision
If sample fluids are transported to the surface for analysis, then conventional laboratory analysis can be performed, but the process is time-consuming and costly
Solution Approach 1:
The patent implements self-service by performing the separation function within the microfluidic device itself using a microporous membrane. The device autonomously separates phases at the point of sampling without requiring external transportation to surface laboratories, enabling immediate analysis and eliminating the time and cost associated with sample transport and post-factum analysis.
Solution Approach 2:
The patent performs preliminary separation action at the sampling location using the microporous membrane before any transportation occurs. By separating phases in situ, the system prepares the sample for immediate analysis, eliminating the need for subsequent transportation and pre-laboratory processing steps.
4Productivity
If high pressure is applied across the membrane for separation, then separation efficiency increases, but the membrane becomes fouled and operation stops
Solution Approach 1:
The patent optimizes the pressure parameter by maintaining pressure differential below the capillary break-through pressure of the membrane. This parameter control prevents membrane fouling and phase breakthrough while maintaining effective separation. The system achieves continuous operation by operating within this optimized pressure regime, balancing separation efficiency with membrane protection.
Solution Approach 2:
The patent replaces high-pressure mechanical forcing with a low-pressure capillary-driven separation mechanism. By utilizing capillary pressures inherent to the microporous membrane structure rather than high external pressure, the system achieves effective separation without fouling the membrane, enabling continuous operation.
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 efficient separation and analysis of fluids in real-time or near real-time from subterranean environments, reducing contamination and improving data accuracy by maintaining a low pressure drop across the membrane to prevent fouling and ensure continuous operation.
Implementation Method 1
maintaining a pressure difference across the membrane below a capillary break-through pressure of a nonwetting component of the multiphase mixture
Implementation Method 2
a water-repellant or oil-permeable membrane to efficiently separate liquids or gases without fouling
Data Source
AI summary
The present invention provides methods and apparatus for separating and/or analyzing fluids of interest. According to principles of the present invention, fluid analysis is accomplished with microfluidic devices and may be reported in real-time or near real-time in a subterranean environment. In addition or alternative to oilfield applications, the principles of the present invention contemplate separation in a laboratory or other environment for biological sample separation and analytical chemistry applications. The present invention is capable of separating liquid-liquid mixtures or emulsions in a microfluidic device without fouling.