Compressible Epoxy Zonal Isolation Sealant for Expandable Tubing
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Solution Overview
Problem
Conventional zonal isolation sealants lack compressibility and resilience, preventing the expansion of expandable tubing without fracturing the system, as they harden before the tubing can be expanded, leading to incomplete sealing and fluid migration between zones.
Innovation Solution
A compressible and resilient epoxy zonal isolation composition that includes epoxy resins and hardening agents, capable of maintaining seal integrity during and after expansion, allowing for the expansion of tubing before, during, or after curing, with specific formulations for different temperature ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealants are used for zonal isolation, then zonal isolation is achieved, but the sealant lacks compressibility and prevents expansion of expandable tubing
Solution Approach 1:
The patent modifies the chemical composition parameters of the sealant by incorporating elastomeric polymers (such as polyethylene glycol, polypropylene glycol, or silicone oils) in specific concentrations (5-50 wt%) alongside epoxy resins and hardening agents. This parameter change transforms the sealant from a rigid, non-compressible conventional formulation to a compliant, compressible formulation that can accommodate expandable tubing expansion while maintaining zonal isolation integrity.
Solution Approach 2:
The patent creates a composite sealant material by combining epoxy resins (providing strength and adhesion), hardening agents (providing structural integrity), and elastomeric polymers (providing compressibility and resilience). This composite formulation achieves a balance between rigidity for isolation and flexibility for tubing expansion, resolving the contradiction between reliable zonal isolation and adaptability to expandable tubing.
2Loss of time
If conventional sealants harden quickly, then setting time is reduced, but expandable tubing cannot be expanded after setting
Solution Approach 1:
The patent introduces dynamic properties to the sealant system by using elastomeric polymers that provide time-dependent compliance. The sealant maintains a plastic or semi-plastic state during the expansion window, allowing tubing expansion, then progressively develops full strength and rigidity for long-term isolation. This dynamic behavior extends the effective expandability window without significantly increasing overall setting time.
Solution Approach 2:
The elastomeric polymer components act as a cushioning mechanism that absorbs expansion forces before the sealant fully hardens. This beforehand cushioning allows the tubing to be expanded during the setting process without fracturing the sealant, effectively extending the operational window for tubing expansion while maintaining efficient setting characteristics.
3Reliability
If conventional sealants are used, then zonal isolation is provided, but the sealant is too hard and causes system fracturing during tubing expansion
Solution Approach 1:
The patent changes the mechanical property parameters of the sealant by incorporating elastomeric polymers that reduce hardness and increase elongation at break. The formulation achieves optimal parameter balance where the sealant maintains sufficient compressive strength for zonal isolation (typically 500-5000 psi compressive strength) while reducing Shore hardness to a range that allows tubing expansion without fracturing (e.g., Shore A 40-70 range).
Solution Approach 2:
The composite formulation combines the high strength and adhesion properties of epoxy resins with the high elongation and compliance properties of elastomeric polymers. This composite material achieves a synergistic effect where the epoxy matrix provides structural integrity for isolation while the elastomeric phase provides ductility and fracture resistance during tubing expansion operations.
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 composition ensures at least 75% to 95% retention of seal integrity after compression, enabling effective zonal isolation and preventing fluid migration, while allowing for the expansion of tubing without loss of seal integrity, thus providing long-term isolation.
Implementation Method 1
An epoxy zonal isolation composition including one epoxy resin or a plurality of epoxy resins and one hardening agent or a plurality of hardening agents where the composition cures to form a cured epoxy zonal isolation composition
Implementation Method 2
having sufficient compressibility and/or resilience properties to permit compression of the composition without substantial loss in seal integrity or zonal isolation
Data Source
AI summary
Epoxy-based zonal isolation compositions are capable of being adjusted by varying the epoxy-based compositions for isolating zones in borehole of oil and gas wells under high-temperature, mid-temperature and low-temperature conditions.