CO2-Resistant Cement Slurry Composition for Durable Well Sealing
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Solution Overview
Problem
Existing cement slurry systems lack sustainable corrosion resistance against carbon dioxide, leading to structural compromise and ineffective sealing in carbon capture and storage wells.
Innovation Solution
A corrosion-resistant cement slurry formulation comprising activated carbon, nanosilica, nano-alumina, and other components, which forms a protective film to prevent carbon dioxide penetration and maintains high compressive strength and low permeability even under corrosive conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultra-fine inert materials and active siliceous materials are used to reduce permeability and alkalinity, then carbon dioxide corrosion resistance is improved, but the cement stone cannot maintain sustainable corrosion resistance after invasion by CO2-corrosive medium
Solution Approach 1:
The patent incorporates corrosion-resistant materials (activated carbon, nanosilica, nano-alumina, diatomite, fly ash, metakaolin, pumice, and coal gangue) into the cement slurry formulation before cementation. These materials pre-establish a protective barrier and reactive components that will actively resist CO2 corrosion over time, rather than waiting for corrosion to occur and then attempting mitigation.
Solution Approach 2:
The patent uses a composite material system combining multiple components: activated carbon for adsorption, nanosilica and nano-alumina for pore filling and pozzolanic reactions, and industrial by-products (diatomite, fly ash, metakaolin, pumice, coal gangue) for additional corrosion resistance. This multi-component composite approach creates synergistic effects that provide sustained corrosion protection.
2Reliability
If nanosilica is used to fill pores and increase Si/Ca ratio, then corrosion resistance is improved, but the applicable temperature range is limited
Solution Approach 1:
The patent formulates a cement slurry system that performs multiple functions across varying temperature conditions. The corrosion-resistant material composition is designed to maintain effectiveness across a broad temperature range (30-150°C), making the cement suitable for various geological storage conditions. The multiple components (activated carbon, nanosilica, nano-alumina, and industrial by-products) provide both corrosion resistance and temperature adaptability.
Solution Approach 2:
The patent optimizes the formulation parameters of the corrosion-resistant materials to achieve optimal performance across different temperature ranges. By adjusting the composition ratios and particle size distributions of the multiple components, the cement slurry maintains its corrosion-resistant properties and structural integrity from 30°C to 150°C, adapting to different geological storage environments.
3Ease of manufacture
If conventional cement slurry is used, then ease of manufacture is maintained, but compressive strength and sealing performance deteriorate under CO2 corrosion
Solution Approach 1:
The patent enhances conventional cement slurry by incorporating a composite corrosion-resistant material system consisting of activated carbon, nanosilica, nano-alumina, and industrial by-products (diatomite, fly ash, metakaolin, pumice, coal gangue). This composite approach maintains relative manufacturing simplicity while dramatically improving compressive strength and sealing performance under CO2 corrosion conditions through the synergistic effects of the multiple components.
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 cement slurry exhibits high compressive strength, low permeability, and good mechanical properties over a wide temperature range, ensuring long-term effective sealing in carbon dioxide storage wells.
Implementation Method 1
activated carbon, nanosilica, and nano-alumina... forms a protective film to prevent carbon dioxide penetration
Implementation Method 2
nanosilica exerts a pore-filling and blocking effect on the internal micropores of set cement
Implementation Method 3
reacting with cement minerals to enhance the carbon dioxide corrosion resistance
Data Source
AI summary
A corrosion-resistant material for a cement slurry, a carbon dioxide corrosion resistant cement slurry, a preparation method, and a use. The corrosion-resistant material comprises a mixture A and a mixture B, wherein the mixture A comprises activated carbon, nanosilicon dioxide, and nano-alumina; the mixture B comprises a component C and a component D; the component C is selected from diatomite and/or fly ash; and the component D is selected from one or more of metakaolin, pumice, and coal gangue. The carbon dioxide corrosion resistant cement slurry made of the corrosion-resistant material has good corrosion resistance in a CO2 corrosion environment; the cement stone before corrosion has a high compressive strength and a compact structure; and the cement stone after corrosion has good comprehensive properties, for example, has no obvious decrease in compressive strength, small permeability, good mechanical properties, good settling stability, and good rheology, such that the cementing quality of a CCUS well is guaranteed, and efficient storage of CO2 is achieved.