Compatibilized Cement Composition for Wellbore Integrity
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Solution Overview
Problem
Cement sheaths in wellbore integrity face failures due to shear, tensile, impact, flexural, and compressive stresses, leading to fractures, debonding, and loss of zonal isolation, especially in high temperature wells, causing production issues and environmental hazards.
Innovation Solution
A compatibilized cement composition is developed, incorporating a curable resin, a cement slurry, and a compatibilizer composition with a substituted or unsubstituted C5-C50 hydrocarbon including an internal olefin and a polyether, which improves rheology, reduces shear stress, and enhances cement placement and homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy resins are added to cement to increase mechanical properties and reduce permeability, then compressive strength and mechanical properties improve, but rheology of the cement mixture is adversely affected
Solution Approach 1:
A compatibilizer is introduced as an intermediary substance between the epoxy resin and cement slurry. The compatibilizer has molecular structures that are compatible with both the epoxy resin and the cement slurry, allowing the epoxy to be dispersed throughout the cement matrix without causing adverse rheological effects. This mediator enables the mechanical property enhancements from epoxy while maintaining acceptable flow characteristics.
Solution Approach 2:
The invention creates a composite material system consisting of cement slurry, epoxy resin, and compatibilizer working together. The compatibilizer forms a compatibilized cement composition where the epoxy resin is integrated into the cement matrix through the compatibilizer's bridging作用, achieving both improved mechanical properties and controlled rheology through the composite nature of the mixture.
2Productivity
If high temperature fluids are injected or produced through the well bore, then production or injection operations can be performed, but the cement sheath experiences thermal expansion and high pressures causing potential failure
Solution Approach 1:
The invention modifies the physical and chemical parameters of the cement composition by incorporating epoxy resins and compatibilizers. The epoxy resin content and compatibilizer concentration are optimized to change the thermal expansion coefficient and pressure distribution characteristics of the cement sheath, allowing it to better accommodate high temperature and pressure conditions without failing.
Solution Approach 2:
The compatibilized cement composition creates a composite material with enhanced thermal and mechanical properties. The epoxy resin-cement-compatibilizer composite structure provides improved thermal stability and pressure distribution, enabling the cement sheath to withstand the stresses induced by high temperature fluid injection and production operations.
3Reliability
If pipe string is cemented in well bore to provide zonal isolation, then wellbore integrity is improved, but the cement sheath is subjected to shear, tensile, impact, flexural, and compressive stresses causing potential failure
Solution Approach 1:
The invention uses a composite material system where epoxy resin is integrated into the cement matrix through the compatibilizer. This composite structure provides enhanced mechanical strength, flexibility, and stress distribution capabilities, allowing the cement sheath to better resist the shear, tensile, impact, flexural, and compressive stresses that occur during wellbore operations and production.
Solution Approach 2:
The addition of epoxy resin and compatibilizer changes the mechanical parameters of the cement composition, including increased compressive strength, reduced Young's modulus, and improved flexibility. These parameter changes enable the cement sheath to better accommodate the various stresses applied during cementing operations and subsequent wellbore use without failing.
Data Source
AI summary
A compatibilized cement composition for the treatment of a subterranean formation and a method of treating a subterranean formation are disclosed. The method can include placing in a subterranean formation a composition including a compatibilized cement composition. The compatibilized cement composition can include a curable resin or cured product thereof, a cement slurry, and a compatibilizer composition, a reaction product thereof, or a combination thereof. The compatibilizer composition can include a substituted or unsubstituted C5-C50 hydrocarbon including at least one internal olefin and a polyether.