Carboxylated Elastomer Cement Sheath Bonding
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Solution Overview
Problem
Conventional particulate elastomers used in cement compositions are hydrophobic and non-polar, leading to poor adhesion with the cement matrix and formation surfaces, resulting in debonding and reduced stress transfer, which can cause cement sheath failure under cyclic and thermal stresses in subterranean well operations.
Innovation Solution
Incorporating particulate carboxylated elastomers with carboxy groups into cement compositions to enhance adhesion and mechanical properties, allowing for improved bonding with the cement matrix and formation surfaces, and providing stress resistance through ionic bonding and improved elasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional hydrophobic particulate elastomers are used in cement compositions, then the cement composition can provide some elasticity and stress resistance, but the adhesion between the elastomer and cement matrix is poor, leading to debonding and reduced stress transfer
Solution Approach 1:
The patent applies parameter changes by modifying the chemical properties of the elastomer from hydrophobic to hydrophilic through carboxylation. This changes the polarity and surface chemistry of the elastomer particles, enabling them to form strong adhesive bonds with the polar cement matrix while maintaining their elastic properties and stress resistance capabilities.
Solution Approach 2:
The patent creates a composite material system by combining hydrophilic carboxylated elastomers with cement matrix. This composite approach allows the elastomer particles to function as both adhesive modifiers and elastic reinforcement, simultaneously improving bond strength and providing stress resistance through the synergistic interaction between the polar elastomer surface and cement matrix.
2Ease of manufacture
If hydrophobic particulate elastomers are used, then the cement composition can be formulated with standard materials, but the bond between cement sheath and pipe string or formation may fail under cyclic and thermal stresses
Solution Approach 1:
The patent modifies the chemical parameters of the elastomer by introducing carboxyl groups, transforming it from a hydrophobic to a hydrophilic material. This parameter change enables the elastomer to form reliable bonds with the cement matrix and pipe string surfaces under cyclic and thermal stresses, while the elastomer's elastic properties continue to provide stress absorption and resistance to cement sheath failure.
3Ease of manufacture
If conventional elastomers are used, then the cement composition can be prepared with standard formulations, but stress transfer from cement matrix to elastomer is reduced due to poor adhesion
Solution Approach 1:
The patent changes the surface chemistry parameters of the elastomer by carboxylation, making it hydrophilic and polar. This parameter change dramatically improves the interfacial adhesion between the elastomer particles and the cement matrix, enabling efficient stress transfer from the rigid cement matrix to the elastic elastomer particles, thereby enhancing the overall mechanical performance of the cement composition.
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 use of particulate carboxylated elastomers enhances the mechanical properties and adhesion of cement compositions, increasing tensile and compressive strengths, and providing improved shear resistance and cyclic stress resistance, thereby reducing the likelihood of cement sheath failure.
Implementation Method 1
enhance adhesion and mechanical properties, allowing for improved bonding with the cement matrix and formation surfaces, and providing stress resistance through ionic bonding
Implementation Method 2
providing improved shear resistance and cyclic stress resistance, thereby reducing the likelihood of cement sheath failure
Data Source
AI summary
Methods of cementing comprising: providing a cement composition comprising water, a cement, and a particulate elastomer comprising a carboxy group; and allowing the cement composition to set. Cement compositions comprising water, a cement, and a particulate elastomer comprising a carboxy group.