Self-Repairing Cement Composition for Wellbore Integrity
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Solution Overview
Problem
Wellbore cement compositions often lose structural integrity due to pressure and temperature changes, leading to cracks and increased permeability, which results in fluid migration and reduced production efficiency, necessitating costly repair procedures.
Innovation Solution
A self-repairing cement composition comprising a cementitious material, an elastomeric material with a bonding polar group, and water, which sets to form a cement that can self-repair by obstructing fluid pathways upon loss of structural integrity, utilizing a phase transition temperature equal to or less than the bottom hole static temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional cement compositions are used in wellbores, then initial structural integrity is achieved, but the cement sheath develops cracks and loses integrity due to pressure and temperature changes
Solution Approach 1:
The patent changes the physical state parameter of the elastomeric material by selecting materials with phase transition temperatures below bottom hole static temperatures. This causes the material to transition from a rigid state during cementing to a softened, flowable state at downhole temperatures, enabling it to fill cracks and self-repair damage without requiring external intervention or complex repair equipment.
2Reliability
If the cement sheath develops cracks, then fluid migration pathways are created, but repair procedures are expensive and reduce production efficiency
Solution Approach 1:
The patent implements self-service by incorporating elastomeric materials that automatically activate upon cement setting to seal cracks and prevent fluid migration. The material flows into damage zones and solidifies in place, providing self-repair without requiring external repair operations, thereby eliminating downtime and maintaining production efficiency while preserving sealing capability.
3Adaptability or versatility
If elastomeric materials with phase transition temperature at or below bottom hole static temperature are used, then self-repair capability is achieved, but the complexity of material composition increases
Solution Approach 1:
The patent applies composite materials by combining cementitious materials with elastomeric materials that have specific phase transition properties. This creates a composite cement composition where the elastomeric component provides adaptive self-repair capability while the cementitious matrix provides structural strength, achieving both functionality and simplicity through material composition rather than complex mechanical systems.
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 self-repairing cement composition maintains mechanical and physical properties, reducing permeability and preventing fluid migration, thus enhancing the structural integrity and production efficiency of the wellbore.
Implementation Method 1
the elastomeric material has a phase transition temperature, exhibits cold flow behavior, or both at less than or equal to the bottom hole static temperature of the wellbore
Implementation Method 2
the elastomeric material has a phase transition temperature, exhibits cold flow behavior, or both at less than or equal to the bottom hole static temperature of the wellbore
Implementation Method 3
an elastomeric material comprising a bonding polar group
Data Source
AI summary
A method of servicing a wellbore comprising placing a cement composition comprising a cementitious material, water, and an elastomeric material comprising a bonding polar group into a wellbore, and allowing the cement composition to set to form a set cement, wherein the elastomeric material has a phase transition temperature, exhibits cold flow behavior, or both at less than or equal to the bottom hole static temperature of the wellbore. A method of servicing a cased wellbore penetrating a formation, comprising introducing a self-repairing cementitious material into a wellbore, and allowing the cement to set, wherein upon a loss of structural integrity the set cement self-repairs, and wherein the loss of structural integrity comprises the formation of flow pathways for fluid migration in the cement and self-repair comprises obstructing potential pathways for fluid migration.