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Microfluidic Chips Materials, Pressure Capability & Integration
1. What materials are used for your microfluidic chips?
Our chips are fabricated from glass and silicon, typically in a glass–silicon–glass stack configuration. This combines mechanical stability with optical transparency for high-resolution imaging. Simpler glass–silicon designs are also available.
2. What pressures can the chips withstand?
Standard configurations typically operate safely up to 100 bar, depending on geometry and bonding design. Higher pressures can be achieved using pressure-balancing strategies and optimized holder systems.
3. How can pressure capability be increased beyond 100 bar?
Pressure balancing within the chip holder reduces mechanical stress on the chip. Reinforced system integration and optimized design enable operation at significantly higher pressures when required.
4. What factors influence the maximum pressure limit?
Pressure capability depends on:
- Material stack configuration
- Channel geometry and depth
- Bonding quality
- Chip thickness
- Holder design and pressure balancing strategy
5. What are the typical channel dimensions?
Standard lateral channel dimensions can reach down to 2 µm, with typical depths around 50 µm, depending on the application.
6. Can the chips replicate unconventional reservoir structures?
Yes. For unconventional applications, channel depth can be reduced into the nanometer range, with minimum depths around 30 nm. Different depth profiles can be integrated on the same chip to resemble realistic pore size distributions.
7. What is the typical chip size?
A standard chip measures approximately 5 cm × 2 cm, with a thickness of 2–3 mm, providing a compact and robust platform suitable for HPHT operation.
8. Are the chips reusable?
In many applications, chips can be reused depending on fluid type, operating conditions, and cleaning procedures. Proper handling ensures consistent performance over multiple experiments.
9. Can chips be customized?
Yes. Channel layouts, depth profiles, and integration features can be tailored to specific reservoir types or research objectives.
10. How are the chips integrated into the system?
Chips are mounted in dedicated high-pressure holders that provide sealing, pressure control, and thermal management. They integrate seamlessly into automated workflows with controlled injection and data acquisition.
Porous Media Microfluidics Pore-Scale Displacement & Mechanism Analysis
1. Are porous media microfluidic chips representative of reservoir rock?
Porous media chips are not direct geological replicas of specific reservoir cores. They are engineered pore-network systems designed to reproduce the governing geometric and capillary characteristics that control displacement behavior.
These include:
- Pore-body to throat aspect ratios
- Throat size distributions
- Network connectivity and coordination number
- Controlled heterogeneity patterns
The objective is not full geological duplication, but controlled investigation of displacement mechanisms under reproducible conditions.
2. How do porous media chips differ from traditional micromodels?
Traditional glass micromodels often use simplified, regular geometries.
Modern porous media chips can incorporate:
- Statistically representative pore networks
- MICP-calibrated throat distributions
- Designed heterogeneity
- Tunable wettability conditions
The focus is on replicating the capillary and mobility behavior that governs multiphase flow rather than purely visual demonstration.
3. How are pore networks designed?
Pore networks can be generated using several approaches:
- Statistically constructed synthetic networks
- Networks calibrated to MICP-derived pore throat size distributions
- Designs targeting defined pore-body/throat aspect ratios
- Engineered heterogeneity patterns (e.g., layering, permeability contrasts)
- Layouts extracted from microCT images of pore structures
When based on MICP data, the dominant throat size distribution — which controls capillary entry pressure — can be translated into controlled microfluidic geometries.
When based on microCT images, pore architecture can be transferred into manufacturable chip layouts for physically grounded visualization studies.
The goal is to reproduce the governing capillary behavior rather than every individual pore in three dimensions.
4. Can snap-off and capillary trapping occur in porous media chips?
Yes — when relevant geometric and wetting conditions are reproduced.
Snap-off and trapping are governed primarily by:
- Pore-throat aspect ratio
- Throat constriction geometry
- Wettability
- Interfacial tension
- Capillary number
When pore networks are engineered to reproduce realistic throat constrictions and capillary entry pressures, capillary-driven snap-off and trapping mechanisms can occur and be directly visualized.
5. Does the quasi-2D nature of microfluidic chips limit applicability?
Microfluidic porous media systems are typically quasi-2D (2.5D).
While full 3D pore connectivity is not replicated, many dominant displacement mechanisms — including:
- Viscous fingering
- Capillary fingering
- Local trapping
- Mobility contrast effects
are primarily governed by pore-throat geometry and capillary forces.
Three-dimensional geometry influences quantitative scaling, but often not the underlying displacement mechanism.
Microfluidics is therefore highly suitable for comparative and mechanistic studies.
6. How is wettability controlled?
Wettability can be systematically adjusted using specialized surface treatments and coatings.
Depending on the study objective, surfaces may be:
- Functionalized to achieve defined contact angles
- Tuned to reproduce water-wet, oil-wet, or mixed-wet behavior
- Coated with mineral-analog surface layers (e.g., silica-like or carbonate-like characteristics)
This allows controlled investigation of wettability-driven displacement behavior under reproducible laboratory conditions.
7. Can mineralogical effects be represented?
Full mineralogical complexity of natural reservoir rock cannot be replicated.
However, simplified mineralogical behavior can be introduced via:
- Surface chemistry modification
- Mineral-analog coatings
- Controlled wettability tuning
Intentional simplification can be advantageous when isolating chemical or interfacial effects that are otherwise masked by geological heterogeneity.
8. Are reservoir-relevant capillary numbers achievable?
Yes.
Microfluidic systems allow precise control of:
- Flow rates
- Fluid properties
- Geometry
This enables operation across capillary numbers relevant to:
- Waterflooding
- Polymer flooding
- Surfactant flooding
- Gas injection
Capillary scaling and mobility effects can therefore be systematically investigated.
9. How reproducible are results compared to natural cores?
Microfluidic porous media chips offer high repeatability due to:
- Fixed and known geometry
- Controlled surface chemistry
- Absence of uncontrolled geological variability
Natural cores introduce heterogeneity that can complicate mechanism isolation and comparative analysis.
Microfluidics enables statistically robust comparison of formulations and operating conditions.
10. How does microfluidics complement coreflooding?
Coreflooding provides integrated bulk-scale performance validation in natural 3D rock.
Microfluidics provides:
- Direct pore-scale visualization
- Mechanism isolation
- Rapid formulation comparison
- Mobility control assessment
Microfluidics is particularly valuable upstream of core programs to reduce uncertainty and focus testing strategies.
The two approaches are complementary rather than competitive.
11. How can microfluidics help to understand conformance control strategies?
Microfluidics enables direct visualization of conformance mechanisms at pore scale and pattern scale under controlled conditions.
It helps evaluate:
- Selective plugging behavior and flow diversion efficiency
- Propagation and placement of gels, polymers, foams, or particulates
- Changes in sweep efficiency across layered or heterogeneous networks
- Injectivity impacts and breakthrough delay under different injection schemes
This provides a fast, mechanism-focused way to compare conformance formulations and optimize strategy before coreflooding and larger-scale validation.
12. When should porous media microfluidics be used?
It is especially valuable for:
- EOR formulation screening
- Polymer mobility control studies
- Surfactant performance comparison
- Mechanism investigation
- De-risking and narrowing coreflood programs
It serves as a mechanism-driven decision-support tool.
13. When should it not be used?
Porous media microfluidics is not intended for:
- Absolute permeability determination
- Regulatory reporting requiring natural 3D rock validation
- Final large-scale performance confirmation
- Direct reservoir-scale upscaling without supporting data
It is a controlled mechanism-focused platform, not a substitute for integrated reservoir validation tools.
Fluid Testing Microfluidics Application Scope & Flow Assurance Insights
1. What is microfluidic fluid testing?
Microfluidic fluid testing uses precisely engineered flow cells to study multiphase fluid behavior under controlled pressure, temperature, and flow conditions.
It enables real-time observation and quantitative analysis of dynamic fluid interactions at the microscale.
2. What type of information does microfluidic fluid testing provide?
Microfluidic testing delivers high-resolution insight into dynamic multiphase behavior.
It enables direct observation and quantification of:
- Phase transition dynamics
- Gas–liquid interactions
- Emulsion formation and stability
- Asphaltene nucleation and deposition
- Flow regime evolution
By resolving spatial and temporal behavior at the microscale, it provides mechanism-level understanding of fluid instability and chemical response under flow.
3. Can Minimum Miscibility Pressure (MMP) be determined?
Yes.
Microfluidic systems allow controlled pressure variation during gas injection while directly observing displacement efficiency and phase behavior.
MMP can be identified as the pressure at which:
- Interfacial tension approaches zero
- Multiphase boundaries disappear
- Displacement transitions to miscible flow
This enables efficient, repeatable MMP screening under controlled laboratory conditions.
4. Can microfluidic systems operate under HPHT conditions?
Yes.
Our systems can operate at pressures up to 20,000 psi and temperatures up to 250 °C, enabling testing under conditions relevant to deep reservoirs and high-pressure injection processes.
Small internal volumes allow rapid thermal equilibration and stable pressure control during multiphase experiments.
5. Is microfluidic testing quantitative?
Yes.
Quantitative outputs may include:
- Phase fraction evolution
- Droplet size distributions
- Precipitation onset pressure
- MMP determination
- Flow regime transitions
Image analysis combined with controlled operating conditions enables reproducible measurement rather than qualitative observation alone.
6. How does microfluidics support asphaltene and solid precipitation studies?
Microfluidic systems enable:
- Direct visualization of nucleation
- Monitoring of particle growth
- Detection of deposition and channel blockage
- Evaluation of inhibitor effectiveness under flow
This supports dynamic assessment of precipitation risk and mitigation strategies.
7. How are emulsion and interfacial phenomena analyzed?
Microfluidic channels allow controlled generation and observation of:
- Droplet formation
- Coalescence dynamics
- Film stability
- Shear-dependent interfacial behavior
This enables detailed evaluation of emulsion stability and chemical treatment performance.
8. What are the advantages of micro-scale fluid testing?
Microfluidic systems are characterized by:
- Precisely defined geometries and flow paths
- Controlled fluid handling at microliter to milliliter scale
- Well-defined pressure and temperature boundary conditions
Depending on the application, they can enable:
- Reduced reagent consumption
- Controlled and reproducible displacement experiments
- Parallel or sequential screening under consistent conditions
This supports systematic comparison of formulations or operating scenarios with high repeatability — provided that pressure control, temperature stability, and imaging quality are properly managed.
9. When should microfluidic fluid testing be used?
It is particularly valuable for:
- MMP screening
- Chemical formulation comparison
- Asphaltene stability evaluation
- Emulsion behavior analysis
- Flow assurance risk assessment
- Mechanism-focused multiphase studies
It supports early-stage decision making and targeted laboratory programs.
10. When should it not be used?
Microfluidic fluid testing is not intended to replace:
- Full standardized PVT reporting for reserves certification
- Large-scale separator validation
- Regulatory compliance testing requiring bulk methods
It is a high-resolution analytical platform designed to complement established laboratory workflows.
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