Multi-Layer Shock Absorber for Perforation Impact Loads
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Solution Overview
Problem
Existing perforation shock absorbers fail to effectively mitigate residual energy from perforating charges, leading to wellbore safety issues such as failures in the perforating string and packers, particularly due to internal and annular impact loads.
Innovation Solution
An active energy-absorbing shock absorber with a multi-layer structure incorporating foam aluminum, springs, and hydraulic fluid to absorb radial, axial, and annular impact loads, featuring a first energy-absorbing mechanism, a second energy-absorbing mechanism, and an axial-force cushioning mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If foam aluminum material is used in the energy-absorbing filling layer, then radial impact load absorption is improved, but device complexity increases due to multi-layer structure
Solution Approach 1:
Different materials and mechanisms are applied to different locations based on the specific requirements for each type of impact load. Foam aluminum is used in the radial direction for its excellent energy absorption characteristics, while hydraulic buffers and springs are used in other directions. This localized application of different materials optimizes performance for each specific loading condition while managing overall device complexity.
2Reliability
If hydraulic buffer mechanism and energy-absorbing spring are used together, then axial and annular impact load absorption is improved, but device complexity increases
Solution Approach 1:
The hydraulic buffer mechanism and energy-absorbing spring are merged into a unified second shock-absorbing mechanism that handles both axial and annular impact loads. The hydraulic buffer provides viscous damping for axial loads while the spring provides elastic recovery for annular loads, and their combination creates a synergistic effect that improves overall impact absorption capability while managing the complexity through integrated design.
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 absorber effectively reduces impact loads on the wellbore by converting kinetic energy into internal energy, enhancing safety through dual composite energy absorption, suitable for harsh well environments.
Implementation Method 1
Leveraging the excellent energy absorption characteristics of foam aluminum
Implementation Method 2
compression energy absorption of springs
Implementation Method 3
compression energy absorption of springs, buffer fluid and gas
Implementation Method 4
compression energy absorption of springs, buffer fluid and gas
Data Source
AI summary
An active energy-absorbing shock absorber for perforation combined well testing includes a first energy-absorbing mechanism, a second energy-absorbing mechanism and an axial-force cushioning mechanism. The first energy-absorbing mechanism includes a gun body, a gun head, a gun tail joint, a support frame, an energy-absorbing filling layer and a detonation mechanism. The second energy-absorbing mechanism includes an intermediate connecting cylinder, an outer cylinder, a limiting step, a movable impact head, a support base, a hydraulic buffer mechanism, a piston rod, an energy-absorbing spring and an inner cavity piston. The axial-force cushioning mechanism includes a housing, a guide mechanism, a buffer shaft and a multi-stage buffer spring. The absorber with a multi-layer structure is filled with a 7 aluminum material.