Degradable Polymer Matrix Composite for Downhole Drilling
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Solution Overview
Problem
Current degradable materials in the oil field industry face challenges in controlling the rate of degradation and balancing mechanical properties, which affects their performance and efficiency in downhole applications.
Innovation Solution
The development of degradable polymer matrix composites (PMCs) with controlled degradation rates, incorporating degradable polymers, fiber reinforcement, and particulate fillers, along with catalysts and heat sources to accelerate degradation, allowing for tailored mechanical properties and environmental responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If degradable materials are used in downhole applications, then time and cost are saved by avoiding drilling out or retrieving, but the mechanical properties and degradation rate control are compromised
Solution Approach 1:
The patent employs composite materials consisting of degradable polymer matrix combined with metal fibers or mesh reinforcement. The polymer matrix provides degradability while the metal reinforcement maintains mechanical strength and structural integrity during downhole operations. This composite structure resolves the contradiction by enabling both time savings through degradation and reliable mechanical performance during service.
Solution Approach 2:
The patent utilizes parameter changes by incorporating catalysts and heat sources that can be activated to accelerate degradation at controlled rates. By changing environmental parameters (temperature, chemical composition) or activating embedded catalysts, the degradation rate can be precisely controlled to match operational requirements, thereby maintaining reliability while achieving the desired degradation timeline.
2Productivity
If degradable materials are used to save time and cost, then retrieval operations are eliminated, but the ability to control degradation rate and maintain performance is reduced
Solution Approach 1:
The patent implements self-service by embedding catalysts and heat sources within the composite material structure itself. These embedded components enable the material to self-regulate its degradation process without external intervention, automatically adjusting degradation rates based on environmental conditions or predetermined triggers, thus maintaining adaptability while improving operational efficiency.
Solution Approach 2:
The patent applies preliminary action by pre-incorporating catalysts, heat sources, and reinforcement structures into the composite material during manufacturing. These pre-integrated components are designed to activate or function at specific stages, allowing predictable and controlled degradation rates that enhance productivity while maintaining the necessary adaptability for different downhole conditions.
3Strength
If non-degradable materials are used, then mechanical integrity is maintained, but time and cost are increased due to drilling out or retrieving
Solution Approach 1:
The patent uses composite materials where metal fibers or mesh provide the mechanical integrity comparable to non-degradable materials, while the degradable polymer matrix provides the time-saving degradation capability. This composite approach resolves the contradiction by combining the strength benefits of non-degradable materials with the efficiency benefits of degradable materials.
Solution Approach 2:
The patent applies segmentation by separating the structural reinforcement function (performed by metal fibers/mesh) from the degradability function (performed by polymer matrix). This functional segmentation allows each component to optimize its specific role, with the metal providing sustained mechanical integrity and the polymer providing controlled degradation to eliminate retrieval operations.
4Strength
If degradable polymer matrix composites are used with fiber reinforcement and particulate fillers, then mechanical properties are improved, but the complexity of formulation and manufacturing increases
Solution Approach 1:
The patent applies merging by combining multiple functional components (degradable polymer matrix, fiber reinforcement, particulate fillers, catalysts, and heat sources) into a single integrated composite material system. This consolidation improves mechanical properties through synergistic interactions while managing manufacturing complexity through established composite processing techniques and standardized component integration.
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
Enables efficient and controlled degradation of materials in downhole environments, reducing residual materials and operational costs, while maintaining mechanical integrity during application, facilitating faster and more efficient operations.
Implementation Method 1
Degradable materials can change their mechanical, physical and responsive properties upon thermal, hygroscopic, and/or chemical interaction with their environment
Implementation Method 2
Degradable materials can change their mechanical, physical and responsive properties upon thermal, hygroscopic, and/or chemical interaction with their environment
Implementation Method 3
The fiber loading is between approximately 10% to 70% by weight and the particulate loading is between approximately 5% to 60%
Implementation Method 4
along with catalysts and heat sources to accelerate degradation
Data Source
AI summary
Embodiments may generally take the form of a degradable composite structure and a method for controlling the rate of degradation of a degradable composite structure. An example embodiment may take the form of a degradable polymer matrix composite (PMC) including a matrix having: a degradable polymer, a fiber reinforcement, and particulate fillers. The fiber loading is between approximately 10% to 70% by weight and the particulate loading is between approximately 5% to 60%.