Resin-Modified Cement Well Barriers for CO2 Carbonation Resistance
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Solution Overview
Problem
Carbon capture underground storage (CCUS) wells constructed with Portland cement compositions face degradation, increased porosity, and reduced mechanical strength due to prolonged contact with carbon dioxide, compromising barrier integrity.
Innovation Solution
Utilization of a resin modified cement slurry comprising hydraulic cement, resin, hardener, and water, which includes specific resin types and transition metal catalysts, to form a hardened mass that resists carbonation and maintains integrity in subterranean and subsea carbon capture underground storage wells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If Portland cement compositions are used to construct CCUS well barriers, then the barriers provide initial mechanical strength and sealing capability, but they suffer from degradation, increased porosity, and reduced mechanical strength due to prolonged contact with carbon dioxide
Solution Approach 1:
The patent employs composite materials by combining Portland cement with resin modifiers (such as epoxy resins, polyester resins, or vinyl esters) and reinforcing fibers (such as glass fibers, carbon fibers, or basalt fibers). This creates a cement-resin-fiber composite that leverages the binding capability of cement, the chemical resistance of resin, and the mechanical reinforcement of fibers, thereby maintaining both strength and reliability under CO2 exposure.
Solution Approach 2:
The patent modifies the chemical and physical parameters of the cement composition by incorporating resin modifiers that change the pore structure, reduce porosity, and alter the chemical reactivity of the cement matrix. These parameter changes enable the barrier to resist carbonation and maintain mechanical properties over time despite prolonged CO2 contact.
2Reliability
If Portland cement compositions are used to construct CCUS well barriers, then the barriers provide initial sealing capability, but they experience increased porosity and degradation from prolonged contact with carbon dioxide
Solution Approach 1:
The resin modifier in the composite cement-resin system fills and seals the porous structure of the cement matrix, creating a denser, less permeable barrier. The reinforcing fibers further reduce effective porosity by bridging pores and cracks, preventing CO2 ingress and maintaining barrier integrity over time.
Solution Approach 2:
The addition of resin modifiers fundamentally changes the pore structure parameters of the cement, reducing total porosity and altering pore size distribution. This parameter change creates a more impermeable barrier that resists CO2 penetration and prevents the porosity increase that would otherwise occur with pure Portland cement.
3Strength
If Portland cement compositions are used to construct CCUS well barriers, then the barriers provide initial mechanical strength, but they suffer from degradation and reduced mechanical strength due to prolonged contact with carbon dioxide
Solution Approach 1:
The resin component in the composite material acts as a protective barrier that is chemically inert to CO2, shielding the cement matrix from carbonation attacks. The fiber reinforcement provides tensile strength and crack resistance, preventing the propagation of degradation pathways and maintaining mechanical strength even after prolonged CO2 exposure.
Solution Approach 2:
The resin modifier changes the chemical composition and microstructure of the cement, reducing its susceptibility to carbonation. This parameter change creates a more chemically stable barrier that resists degradation from CO2, thereby preserving mechanical strength over the long term.
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 resin modified cement slurry effectively mitigates carbonation, maintaining mechanical strength and barrier integrity in CCUS wells, even under prolonged exposure to carbon dioxide, ensuring efficient carbon storage.
Implementation Method 1
setting the resin modified cement slurry to form a set cement
Implementation Method 2
the set cement forms a barrier in the carbon dioxide injection zone that has reduced susceptibility to penetration of a carbonation front into a matrix of the set cement
Data Source
AI summary
A method may include: introducing a resin modified cement slurry into a wellbore penetrating a subterranean formation, the subterranean formation comprising a caprock and a carbon dioxide injection zone, the resin modified cement slurry comprising: a resin; a hardener, a hydraulic cement; and water; and setting the resin modified cement slurry to form a set cement wherein the set cement forms a carbonation-resistant barrier in the carbon dioxide injection zone in the subterranean formation.