Perforation Gun Shock Load Management
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Solution Overview
Problem
Perforation tool assemblies in wellbore servicing often experience separation, buckling, or failure due to accumulated shock load energy from detonating explosive charges, leading to costly and time-consuming retrieval operations and potential wellbore loss.
Innovation Solution
Incorporating a mechanical energy absorber between the perforation gun and tool string connector, which absorbs or frequency-shifts the shock wave energy, allowing for a limited range of motion and reducing the shock load on the perforation tool assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid coupling is used between the perforation gun and tool string connector, then the structural strength is improved, but the shock load accumulation causes separation and failure
Solution Approach 1:
A mechanical energy absorber is installed between the perforation gun and tool string connector to absorb shock load energy before it can cause separation or failure. The energy absorber is designed to engage during shock events, converting kinetic energy from the shock wave into deformation energy, thereby protecting the rigid coupling from excessive stress while maintaining structural integrity during normal operation.
2Reliability
If the mechanical energy absorber is added to reduce shock load, then the tool assembly reliability is improved, but the device complexity increases
Solution Approach 1:
The mechanical energy absorber acts as an intermediary component between the perforation gun and tool string connector. It is a self-contained device that automatically engages during shock events without requiring external control systems, sensors, or complex actuation mechanisms. The absorber's simple passive design allows it to mitigate shock loads while adding minimal complexity to the overall tool assembly.
3Force
If the mechanical energy absorber allows relative motion, then the shock load is reduced, but the coupling stability deteriorates
Solution Approach 1:
The mechanical energy absorber provides dynamic protection by allowing controlled relative motion during shock events while maintaining rigid coupling during normal operation. The absorber's design enables it to deform under shock loading, absorbing energy through controlled displacement, while returning to its original state after the shock passes, thereby maintaining coupling stability without permanent deformation.
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 mechanical energy absorber effectively mitigates shock load accumulation, reducing the risk of tool assembly failure and facilitating safer, more efficient wellbore perforation operations by managing shock wave propagation.
Implementation Method 1
a mechanical energy absorber between the perforation gun and tool string connector, which absorbs or frequency-shifts the shock wave energy
Implementation Method 2
The mechanical energy absorber effectively mitigates shock load accumulation, reducing the risk of tool assembly failure
Data Source
AI summary
A perforation tool assembly. The perforation tool assembly comprises a tool string connector, a perforation gun coupled to the tool string connector, and a structure configured to absorb mechanical energy released by firing one or more perforation guns. The coupling is configured to provide a limited range of motion of the tool string connector relative to the perforation gun. The tool string connector and the perforation gun retain the structure configured to absorb mechanical energy.