Self-Healing BOP Elastomer Seals for HP/HT Crack Repair
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Solution Overview
Problem
Conventional BOP packers/seals fail due to cracking under high pressure and high temperature conditions, leading to irreversible degradation and reduced reliability, especially in subsea operations where space constraints and extreme conditions exacerbate failure modes.
Innovation Solution
Incorporation of self-healing elastomeric compounds in BOP packers, comprising elastomers like NBR, HNBR, XNBR, FKM, FFKM, NR, and self-healing agents such as polyethyleneimine, carbon black, and silica, which activate to repair micro-cracks under crack-propagating conditions, maintaining seal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional elastomeric packers are used in high pressure and high temperature conditions, then initial sealing capability is achieved, but cracking and irreversible degradation occur leading to failure
Solution Approach 1:
The elastomeric packer incorporates self-healing agents that automatically detect and repair micro-cracks through chemical reactions when exposed to wellbore conditions, enabling the seal to maintain its own integrity without external intervention. This self-service mechanism directly addresses the cracking issue and extends service life in HP/HT environments.
Solution Approach 2:
The patent modifies the chemical composition parameters of the elastomer by incorporating specific self-healing agents and carbon black at optimized concentrations. These parameter changes transform the material's degradation behavior, allowing it to heal cracks rather than fail irreversibly under high pressure and temperature conditions.
2Ease of operation
If elastomeric seals are exposed to extreme high temperatures, then initial flexibility is maintained, but physical and chemical deterioration occurs causing swelling and increased friction
Solution Approach 1:
The self-healing agents actively counteract thermal degradation by forming crosslinks and repairing polymer chains when exposed to high temperatures, preventing the chemical stability deterioration that would otherwise cause swelling and increased friction.
Solution Approach 2:
The elastomer is formulated as a composite material combining base elastomer with self-healing agents and carbon black. This composite structure provides both the flexibility needed for operation and the chemical stability to resist thermal degradation, resolving the contradiction between ease of operation and compositional stability.
3Force
If high pressure applications are applied to conventional seals, then sealing force is achieved, but compression set and volumetric changes occur leading to failure
Solution Approach 1:
The self-healing agents continuously repair polymer chains and crosslinks formed during compression, preventing permanent volumetric changes and compression set. This allows the seal to maintain its sealing force while recovering its original volume after pressure application.
Solution Approach 2:
The patent changes the rheological and mechanical parameters of the elastomer through the incorporation of self-healing agents, enabling the material to undergo reversible deformation under high pressure while maintaining volumetric stability and preventing permanent set.
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
Enhances the longevity and reliability of BOP packers by healing cracks in situ, extending their operational life and maintaining seal integrity under HP/HT conditions, thus improving safety and efficiency in oil and gas extraction.
Implementation Method 1
the elastomer matrix in the packers is modified with self-healing characteristics thereby allowing for in situ healing of the cracks and prevention of degradation of the matrix to the point of failure
Implementation Method 2
self-healing agents such as polyethyleneimine, carbon black, and silica, which activate to repair micro-cracks under crack-propagating conditions
Implementation Method 3
Such self-healing elastomeric compounds may include at least one or more elastomers, carbon black, silica, and a self-healing agent
Implementation Method 4
the self-healing agent is evenly distributed throughout the elastomeric compound
Data Source
AI summary
A self-healing elastomeric compound for use in blowout preventer packers includes one or more elastomers, carbon black, silica, and a self-healing agent evenly distributed throughout the compound.