Self-releasing Plug for Subterranean Well Flow Control

The patent applies the dynamics principle by making the flow resistance variable rather than fixed. The support structure is designed to degrade over time, dynamically changing the flow resistance characteristics. This allows the system to adapt to changing fluid compositions and velocities without requiring complex control mechanisms, resolving the contradiction between adaptability and device complexity.

The patent changes the physical-chemical parameters of the support structure by using degradable materials. As the support structure degrades, its mechanical properties change, which in turn changes the flow resistance parameters. This parameter change approach enables adaptation to varying fluid conditions while maintaining relatively simple device structure.

The patent applies the self-service principle by designing a system that automatically responds to fluid composition changes without requiring external monitoring or manual intervention. The degradable support structure self-adjusts the flow resistance based on the fluid it contacts, and the plug automatically seals the wellbore when degradation reaches a critical point. This achieves high automation while maintaining ease of operation.

The system incorporates implicit feedback through the degradation process. The support structure's degradation rate is directly influenced by the fluid composition it contacts, creating a natural feedback mechanism. When undesired fluids are present, they accelerate degradation, which then triggers the sealing action, automatically regulating flow without external control systems.

The patent applies beforehand cushioning by designing the degradable support structure with controlled degradation characteristics. The structure is engineered to maintain its load-bearing capacity and flow control function throughout the intended operational period, then gradually degrade to trigger the shutdown mechanism. This pre-planned degradation path ensures reliability during operation while enabling automatic shutdown when needed.

The support structure is designed as a temporary, disposable component that fulfills its function for a specific operational period and then degrades to enable shutdown. This approach accepts reduced long-term reliability of the support structure itself, but achieves the broader system goal of automatic flow control and prevents continuous operation under adverse conditions.

The patent uses feedback through the degradation mechanism to balance productivity and service life. The increased flow velocity and undesired fluid composition accelerate degradation, which naturally limits the operational period and triggers shutdown before excessive production of undesired fluids occurs. This creates a self-regulating system where the degradation rate serves as a feedback signal.

The system changes parameters over time through controlled degradation. Initially, the support structure provides high flow resistance to maximize desired fluid production. As degradation progresses, the resistance decreases and flow velocity increases, accelerating degradation further until shutdown occurs. This time-dependent parameter change allows optimized productivity during the service period while automatically limiting total exposure to adverse conditions.