Microfluidic Chip Multiple Porosity Regions Reservoir Modeling
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Solution Overview
Problem
Existing micromodels are limited in their ability to effectively model the complex porosities found in carbonate reservoirs, which are crucial for improving oil recovery, as they often lack representation of multiple porosity types and geochemical surfaces typical of carbonate rocks.
Innovation Solution
A microfluidic chip with multiple porosity regions is created by etching microchannels in a substrate, filling some with silicon dioxide spheres to form nanoscale porosity and leaving others empty to create microscale porosity, and then functionalizing the surfaces with calcium carbonate nanocrystals to resemble carbonate reservoirs, allowing for the study of fluid interactions and behaviors in both porosity zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing micromodels are used to model carbonate reservoirs, then the modeling process is simple, but they fail to represent the complex multiple porosities and geochemical surfaces of natural carbonate reservoirs
Solution Approach 1:
The microfluidic chip is designed with distinct regions having different porosity characteristics - a first region with nanoscale porosity formed by silicon dioxide spheres and a second region with microscale porosity. This local differentiation allows each region to represent different porosity types found in carbonate reservoirs, thereby improving the overall representation of complex porosity structures while maintaining a manageable device structure.
Solution Approach 2:
Silicon dioxide spheres are embedded within the microchannel structure to create nanoscale porosity regions. These spheres are nested within the larger microfluidic chip framework, allowing the nanoscale features to be contained within the microscale device architecture. This nesting approach enables the representation of multiple porosity scales within a single integrated device.
2Manufacturing precision
If a microfluidic chip with multiple porosity regions is created, then the ability to model complex carbonate reservoir porosities is improved, but the manufacturing process becomes more complex
Solution Approach 1:
Silicon dioxide spheres are pre-formed and functionalized with carboxylate groups before being introduced into the microfluidic chip. The spheres are prepared in advance with controlled sizes and surface properties, which simplifies the final assembly process. This preliminary preparation of spheres allows for precise control of nanoscale porosity characteristics without adding significant complexity to the overall manufacturing workflow.
Solution Approach 2:
The manufacturing process utilizes controlled parameters such as sphere diameter (100 nm to 5 microns), functionalization conditions, and deposition parameters for calcium carbonate nanocrystals. By precisely controlling these parameters, the process achieves high manufacturing precision for porosity region formation while maintaining a systematic and reproducible fabrication approach that manages manufacturing complexity.
3Manufacturing precision
If silicon dioxide spheres are used to create nanoscale porosity regions, then the porosity representation accuracy is improved, but the device structure becomes more complex
Solution Approach 1:
Silicon dioxide spheres with controlled porosity are used as the fundamental building blocks to create the nanoscale porosity region. These porous spherical particles are introduced into the microchannel and pack to form a region with characteristic nanoscale pore structures. This approach leverages the inherent porosity of the spherical materials to achieve accurate nanoscale porosity representation without requiring complex artificial pore structures.
Solution Approach 2:
The silicon dioxide spheres are confined to specific regions of the microfluidic chip to create localized nanoscale porosity zones. By controlling the spatial distribution and concentration of spheres within designated microchannels, the device achieves precise local nanoscale porosity characteristics while leaving other regions with different porosity types, thereby managing overall structural complexity through regional specialization.
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
The microfluidic chip enables the visualization and study of fluid behaviors in both nanoporosity and microporosity zones, facilitating the understanding of oil recovery mechanisms and improving oil extraction efficiency by mimicking the complex porosities of natural carbonate reservoirs.
Implementation Method 1
Silicon dioxide spheres are injected into the microfluidic chip, the silicon dioxide spheres forming a region of nanoscale porosity in a portion of the microchannels not filled with blocking material
Implementation Method 2
A solvent is injected into the microfluidic chip, the solvent operable to dissolve the blocking material and thereby providing a region of microscale porosity adjacent to the region of nanoscale porosity
Implementation Method 3
Calcium carbonate nanocrystals are formed on the functionalized surface by flowing a calcium chloride solution through the chip, and iterating between flowing a sodium carbonate solution through the chip and flowing the calcium chloride solution through the chip
Data Source
AI summary
A blocking material is injected into a microfluidic chip that includes microscale-porosity microchannels etched in a substrate, filling at least a portion of the microchannels. Silicon dioxide spheres are injected into the microfluidic chip. The blocking material prevents the silicon dioxide spheres from entering the portion of the microchannels filled with the blocking material. The silicon dioxide spheres form a region of nanoscale porosity in a portion of the microchannels not filled with the blocking material. A solvent is injected into the microfluidic chip, the solvent operable to dissolve the blocking material and thereby providing a region of microscale porosity adjacent to the region of nanoscale porosity.