Stabilizing CO2 Microbubbles with Nanoparticles for Geological Storage
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Solution Overview
Problem
Current CO2 storage in saline aquifers faces challenges such as slow dissolution rate and increased risk of leakage due to pressure rise and mineral rock dissolution, leading to reduced storage capacity and safety concerns.
Innovation Solution
Injecting nanoparticles to stabilize CO2 microbubbles by pre-mixing CO2 with nanoparticles and passing through a high-pressure pipeline, followed by a dense perforated plate to generate fine-scale CO2 microbubbles, enhancing fluid properties and mixing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If CO2 is injected into saline aquifers for storage, then storage capacity is achieved, but dissolution rate is slow and leakage risk increases
Solution Approach 1:
The patent segments CO2 into microbubbles with diameters of 10-100 μm by injecting through a dense perforated plate with numerous small holes. This segmentation increases the total surface area of CO2 contact with saline water, thereby accelerating the dissolution rate while maintaining storage capacity.
Solution Approach 2:
The patent modifies the local properties of CO2 by mixing nanoparticles (5-50 nm diameter) into the CO2 before injection. The nanoparticles change the local density and surface properties of CO2 microbubbles, enhancing their dissolution characteristics and reducing buoyancy without compromising overall storage capacity.
2Quantity of substance
If CO2 is injected into saline aquifers, then storage capacity is achieved, but reservoir pressure rises causing leakage
Solution Approach 1:
By segmenting CO2 into numerous microbubbles, the patent distributes the injection pressure across many small bubbles rather than one large volume. This reduces peak reservoir pressure and minimizes the risk of breaching sealing barriers, thereby reducing leakage risk while maintaining storage capacity.
Solution Approach 2:
The patent changes the physical parameters of CO2 by incorporating nanoparticles, which modify the density and interfacial properties of CO2 microbubbles. These parameter changes enhance dissolution efficiency, reducing the time CO2 remains as free gas in the reservoir, thereby reducing long-term leakage risk.
3Quantity of substance
If CO2 reacts with saline water to increase dissolution, then storage capacity increases, but mineral rock dissolves reducing mechanical strength
Solution Approach 1:
The patent uses segmented microbubbles to distribute dissolution reactions across many small interfaces rather than one large interface. This distributes the chemical reaction load, preventing localized aggressive dissolution that could damage rock structure, while still achieving high overall storage capacity.
Solution Approach 2:
The nanoparticles act as intermediaries between CO2 and saline water, modifying the interface properties to enhance dissolution efficiency. This allows faster dissolution without the need for excessively acidic conditions, thereby protecting the reservoir rock from severe mechanical degradation.
4Ease of manufacture
If CO2 is injected as large bubbles, then injection is simpler, but buoyancy is high reducing mixing efficiency
Solution Approach 1:
The patent employs segmentation to create microbubbles through a dense perforated plate, which automatically breaks down larger CO2 bubbles into fine microbubbles during injection. This maintains relative injection simplicity while dramatically improving mixing efficiency through increased surface area contact with saline water.
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
This method reduces CO2 buoyancy, increases storage capacity, and improves mixing efficiency, thereby enhancing geological storage safety and reducing leakage risks.
Implementation Method 1
The density, viscosity, and wettability of the original injected fluid changed by injecting micron-sized CO2 of pre-mixed nanoparticles
Implementation Method 2
The density, viscosity, and wettability of the original injected fluid changed by injecting micron-sized CO2 of pre-mixed nanoparticles
Implementation Method 3
CO2 continuously displaces and migrates upwards after injection, then reaches the cap rock and dissolves in reservoir brine to form an acidic solution
Implementation Method 4
convective mixing occurs to further increase the dissolved amount
Implementation Method 5
generating fine-scale CO2 microbubbles can further enhance gas sweep efficiency and enhance dissolution
Data Source
AI summary
A method for enhancing geological storage by injecting nanoparticles to stabilize CO2 microbubbles, which belongs to the technical field of multiphase flow. The method first improves the physical properties of the fluid by pre-mixing CO2 and nanoparticles, and then the fluid is transported to the underground through high-pressure pipelines, and then CO2 microbubbles containing nanoparticles are generated through a dense perforated plate arranged by an injection well to improve the dissolution rate and sweep efficiency of the gas in the saline aquifer, so as to enhance the later mixing of the fluid. The combined injection can improve CO2 storage capacity and storage safety, and further reduce the risk of gas leakage in the reservoir.