Nanofluidic Chip for Carbonate Reservoir Modeling
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Solution Overview
Problem
Current micromodels for oil reservoirs lack the ability to accurately represent submicron-scale porosities and geochemical surface properties of carbonate reservoirs, limiting the investigation of fluid behaviors and interactions.
Innovation Solution
A nanofluidic chip is fabricated using silicon dioxide spheres assembled in microchannels of a glass microfluidic chip, with a calcium carbonate coating to create nanoscale channels and porosities, mimicking the properties of carbonate reservoirs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If micrometer-scale microchannels are used in conventional micromodels, then the device structure is simple and easy to manufacture, but the ability to represent submicron-scale porosities and investigate fluid properties at submicron scales is limited
Solution Approach 1:
The microchannel is segmented into multiple nanochannels by assembling silica spheres within the microchannel. This segmentation transforms a single micrometer-scale channel into numerous nanometer-scale channels, enabling submicron-scale porosity representation while utilizing the simple microchannel structure for assembly
Solution Approach 2:
Silica spheres are used as intermediary objects to create nanochannels within the microchannel. The spheres are assembled within the microchannel to form a packed bed structure, and calcium carbonate nanocrystals are deposited on the sphere surfaces, creating nanoscale porosity without requiring direct fabrication of nanochannels
2Reliability
If glass or polymer materials are used for micromodel construction, then the material is easy to manufacture and optically transparent, but the geochemical surface properties of carbonate reservoir rocks cannot be represented
Solution Approach 1:
The surface properties are made local to the silica sphere surfaces rather than the entire chip. Calcium carbonate nanocrystals are deposited specifically on the silica sphere surfaces within the microchannel, creating localized carbonate-like geochemical surfaces where fluid-rock interactions occur, while the bulk chip material remains glass or polymer
Solution Approach 2:
The nanofluidic chip creates a composite structure combining glass/polymer chip material, silica spheres, and calcium carbonate nanocrystal coating. This composite approach allows the chip to benefit from the optical transparency and ease of manufacture of glass/polymer while the silica-calcium carbonate composite provides the required carbonate reservoir surface properties
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 nanofluidic chip allows for the visualization and study of oil-water phase behavior and rock-fluid interactions at nanoscale porosities, enhancing the understanding of multiphase flow and aiding in enhanced oil recovery techniques.
Implementation Method 1
Silica (silicon dioxide, SiO2) spheres assembled in the microchannels form nanochannels
Implementation Method 2
Calcium carbonate nanocrystals are formed on functionalized surfaces of the precursor nanofluidic chip to form the nanofluidic chip
Data Source
AI summary
Methods and systems for generating a nanofluidic chip as a reservoir model are provided. In an example described herein, a nanofluidic chip for reservoir modeling includes a microfluidic chip that includes microchannels etched in a substrate. Silica spheres are assembled in the microchannels to form nanochannels. A carbonate coating is disposed over the surfaces of the nano channels and the silica spheres.