Debris Catcher With Rupture Disk for Wellbore Flow
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Solution Overview
Problem
Existing downhole tools struggle to effectively filter subterranean fluids and prevent debris from fouling float assemblies and cementing operations in oilfield applications.
Innovation Solution
The implementation of a debris catching assembly with a debris filter assembly that includes a longitudinal body with flow apertures, which traps debris while allowing fluid to pass through, and a selectively operable barrier assembly to maintain fluid flow when clogged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a debris filter assembly with flow apertures is used to trap debris, then debris prevention is improved, but the filter becomes clogged and fluid flow is blocked
Solution Approach 1:
The barrier assembly is designed to be selectively operable, transitioning between closed and open positions based on operational needs. When debris is trapped, the barrier can be opened to restore fluid flow while maintaining the trapped debris, allowing the system to adapt dynamically between filtration and flow modes
Solution Approach 2:
The filter assembly is segmented into distinct functional zones: a debris trapping zone where debris is captured, a barrier assembly that can selectively open/close, and a clean fluid flow path. This segmentation allows independent control of filtration and flow functions
2Reliability
If a barrier assembly is added to maintain fluid flow when clogged, then fluid flow reliability is improved, but device complexity increases
Solution Approach 1:
The barrier assembly serves multiple functions: it acts as a seal to prevent debris passage, provides a mechanism for opening the flow path when clogged, and can be integrated with the filter structure. This multi-functionality reduces the need for separate components for each function
3Ease of manufacture
If flow apertures are used to filter debris, then manufacturing simplicity is improved, but debris trapping effectiveness worsens when apertures clog
Solution Approach 1:
The barrier assembly is pre-positioned to close over the flow path, and the frangible member is pre-installed to rupture at a predetermined force. This preliminary arrangement ensures that when debris clogs the apertures, the pre-installed failure mechanism activates to open the flow path without requiring complex active control systems
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
This solution effectively prevents debris from entering the float assembly and ensures continuous fluid flow during cementing operations by trapping debris and maintaining flow through the debris filter assembly.
Implementation Method 1
The barrier assembly may include a frangible member, such as a rupture disk or the like, which ruptures upon exposure to a preselected pressure, thereby opening the barrier assembly
Data Source
AI summary
A debris catcher assembly includes a debris filter assembly having a selectively operable valve. such as a rupture disk, to allow a secondary flow path should the debris filter assembly become clogged with debris.