CO2-Resistant Hydraulic Cement Slurry Using Alkanolamine Additives
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Solution Overview
Problem
Hydraulic cement compositions used in wellbore applications are susceptible to corrosion by carbon dioxide, leading to structural integrity issues and potential failure, especially in environments with high CO2 concentrations, which can compromise the well's functionality and result in significant economic losses.
Innovation Solution
Incorporation of alkanolamines or derivatives thereof as anti-corrosion agents in hydraulic cement compositions to form carbon-dioxide-resistant cement slurry, which includes Portland cement and additives like fluid loss additives and defoamers, to enhance resistance against CO2 corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional hydraulic cement compositions are used in CO2 environments, then the cement provides structural support and sealing, but the cement becomes susceptible to corrosion by carbon dioxide leading to structural integrity issues
Solution Approach 1:
The patent introduces an intermediary substance (corrosion inhibitor) that mediates between the CO2 environment and the hydraulic cement. This inhibitor forms a protective barrier or chemical reaction product that prevents direct contact between CO2 and the cement matrix, thereby eliminating the harmful interaction while maintaining the cement's structural function
Solution Approach 2:
The patent modifies the chemical composition parameters of the cement slurry by adding corrosion inhibitors and adjusting component ratios. This changes the chemical resistance properties of the hardened cement, making it impervious to CO2 corrosion while maintaining its hydraulic binding properties and structural integrity
2Reliability
If corrosion-resistant additives are incorporated into hydraulic cement, then resistance to CO2 corrosion is enhanced, but the complexity of cement composition increases
Solution Approach 1:
The patent selects corrosion inhibitor substances that perform multiple functions: they inhibit CO2 corrosion, maintain slurry fluidity, and potentially enhance early strength development. This multi-functionality reduces the need for separate additives for each property, thereby managing composition complexity while achieving comprehensive performance improvement
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 anti-corrosion agents effectively prevent corrosion of hydraulic cement in CO2 environments, maintaining structural integrity and preventing fractures, thereby ensuring the wellbore's functionality and reducing the risk of fluid migration.
Implementation Method 1
carbon dioxide gas (CO2) slowly reacts with calcium hydroxide and calcium silicate hydrate in a hardened and set hydraulic cement composition to form calcium carbonate (CaCO3)
Data Source
AI summary
A hydraulic cement composition is provided. The composition comprises a hydraulic cement and an anti-corrosion agent selected from the group consisting of one or more alkanolamines, one or more derivatives of alkanolamines, and combinations thereof. The composition can be mixed with water to form a carbon dioxide-resistant hydraulic cement slurry. A hydraulic cement slurry and a method of cementing in a carbon dioxide environment are also provided.