Perforating Gun Shock Mitigation via Wave Reflection and Attenuation
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Solution Overview
Problem
Existing shock absorbers have limited success in mitigating the shock produced by detonation of perforating guns in subterranean wells, which can damage components of the perforating string.
Innovation Solution
A perforating gun with a shock mitigation device that includes a shock attenuator and reflector, utilizing alternating layers of resilient and non-resilient materials to attenuate and indirectly reflect shock waves, and an explosive material that produces a counteracting shock wave to interact with the detonation shock wave.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional shock absorbers are used to mitigate shock from perforating gun detonation, then some shock reduction is achieved, but the shock mitigation is insufficient and components of the perforating string still suffer damage
Solution Approach 1:
The shock mitigation device is segmented into multiple functional zones: a shock reflector section with angled surfaces to redirect shock waves, and a shock attenuator section with energy-absorbing materials. This segmentation allows different parts of the device to handle different aspects of shock mitigation, achieving more comprehensive protection than traditional single-function shock absorbers.
Solution Approach 2:
The shock reflector converts the harmful shock wave energy into a beneficial force by redirecting it away from sensitive components. The angled surfaces of the reflector bounce the shock waves in directions that do not compromise the integrity of the perforating string components, effectively turning the harmful shock into a contained energy discharge.
2Object-affected harmful factors
If shock waves are reflected directly back into the gun housing, then shock transmission is reduced, but direct reflection can create additional stress concentrations and damage risks
Solution Approach 1:
The shock reflector employs asymmetric angled surfaces rather than flat or symmetric configurations. These specific angles are designed to redirect shock waves away from the gun housing and sensitive components, preventing direct reflection that would create stress concentrations. The asymmetric geometry ensures shock waves are channeled in safe directions, protecting structural integrity.
Solution Approach 2:
The shock reflector acts as an intermediary element between the explosive charge and the gun housing. Instead of allowing shock waves to directly impact the housing, the reflector intercepts and redirects them, serving as a mediating structure that protects the housing from direct shock exposure while managing the energy dissipation.
3Reliability
If multiple components are added to achieve effective shock mitigation, then shock protection improves, but device complexity increases
Solution Approach 1:
The shock reflector and shock attenuator are merged into a single integrated shock mitigation device that is incorporated within the existing gun housing structure. This combination approach achieves comprehensive shock protection (reflection plus attenuation) without requiring separate standalone components, thereby limiting the increase in overall device complexity while maximizing mitigation effectiveness.
Solution Approach 2:
The shock mitigation device is designed with multi-functionality, serving both as a structural component of the gun housing and as an active shock protection system. The integrated design allows the same structure to fulfill multiple roles: containing the explosive charge, reflecting shock waves, and attenuating residual vibrations, thereby reducing the need for additional dedicated components.
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
Effectively reduces the amplitude and transmission of shock waves to other components of the perforating string, preventing damage and improving the reliability of perforating operations.
Implementation Method 1
a shock mitigation device with a shock reflector which indirectly reflects a shock wave produced by detonation of the explosive component
Implementation Method 2
a shock mitigation device in the gun housing. The shock mitigation device includes a shock attenuator which attenuates a shock wave produced by detonation of the explosive component
Implementation Method 3
a shock mitigation device includes an explosive material which produces a shock wave that interacts with another shock wave produced by detonation of an explosive component in a gun housing
Implementation Method 4
a shock wave produced by detonation of the explosive component
Data Source
AI summary
A perforating gun can include at least one explosive component, and a shock mitigation device including a shock reflector which indirectly reflects a shock wave produced by detonation of the explosive component. Another perforating gun can include a gun housing, at least one explosive component, and a shock mitigation device in the gun housing. The shock mitigation device can include a shock attenuator which attenuates a shock wave produced by detonation of the explosive component. Yet another perforating gun can include a shock mitigation device with an explosive material which produces a shock wave that interacts with another shock wave produced by detonation of an explosive component in a gun housing.