Frangible Vent Valve for Perforating Gun Safety
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Solution Overview
Problem
Perforating gun systems face challenges with trapped fluid pressure in connecting subs during disassembly, which can pose a personnel hazard due to high wellbore pressures exceeding 1000 psi, and can lead to clogging from debris accumulation.
Innovation Solution
A safety vent valve system integrated into the connecting sub, featuring a housing with a pressure-producing element and a frangible vent valve that opens to provide fluid communication between the cavity and the outside, activated by a detonating cord or propellant, allowing safe pressure relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connecting sub is used to join perforating guns in a string, then connectivity and structural integrity are improved, but trapped fluid pressure builds up creating safety hazards and clogging issues
Solution Approach 1:
The vent valve is pre-installed within the connecting sub housing, positioned to open automatically when internal pressure exceeds a predetermined threshold. This preliminary preparation ensures that when fluid pressure builds up during operation, the valve is already in place and ready to vent the pressure safely, preventing hazardous trapped pressure without requiring manual intervention or additional components added during operation.
2Object-affected harmful factors
If the vent valve opens to relieve pressure, then safety hazards are reduced, but the valve structure becomes more complex
Solution Approach 1:
The vent valve utilizes a frangible member (such as a rupture disk or fragile seal) that changes its physical state from intact to breached when internal pressure exceeds a predetermined threshold. This parameter-based activation mechanism allows the valve to automatically respond to pressure conditions without requiring complex mechanical actuators, control systems, or multiple moving parts, thereby maintaining structural simplicity while achieving effective pressure relief.
3Reliability
If the frangible member ruptures to vent pressure, then fluid communication is established, but the vent valve can become clogged with debris
Solution Approach 1:
The vent valve is designed with a dedicated venting pathway that extends from the internal cavity through the housing to the external environment. By providing this separate extraction route for fluid and debris, the system isolates the venting function from the main flow paths and connection interfaces, allowing pressure relief without interfering with the primary operational functions of the connecting sub and reducing the likelihood of debris accumulation in critical areas.
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 vent valve effectively reduces pressure differentials and prevents fluid trapping, ensuring safe disassembly and operation by creating a pathway for fluid communication between the inner and outer surfaces of the downhole tool, mitigating hazards and clogging issues.
Implementation Method 1
activating a pressure producing substance, wherein activating the pressure producing substance ruptures the frangible element thereby creating apertures
Implementation Method 2
the vent valve is selectively opened in response to activation of the pressure producing element
Data Source
AI summary
A perforating system connection sub comprising a vent valve for providing fluid flow communication through the connection sub wall. The vent valve is selectively opened and may include a frangible member. The frangible member is rupterable by the shock wave produced by ignition of an associated detonation cord.