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Mechanical Plugging Strength and Failure Risk of Low-Melting-Point Alloy in Casing Sealing.
Wenchao Tao1, Gonghui Liu1, Chunqing Zha1
1College of Mechanical and Energy Engineering, Beijing University of Technology, Beijing 100124, China.
Materials (Basel, Switzerland)
|April 14, 2026
Summary
This study shows that increasing ambient temperature weakens low-melting-point alloy (LMPA) seals in casings. However, applying forming pressure improves seal integrity, and specific aspect ratios maintain sealing capacity after shear failure.
Area of Science:
- Materials Science
- Mechanical Engineering
- Petroleum Engineering
Background:
- Downhole casing sealing is critical in oil and gas operations.
- Low-melting-point alloys (LMPAs) are potential materials for mechanical plugging.
- Understanding sealing performance under varying conditions is essential.
Purpose of the Study:
- To investigate the impact of axial pressure and temperature on LMPA mechanical plugging performance.
- To elucidate the mechanisms governing LMPA sealing in casings.
- To provide data for optimizing LMPA applications in downhole operations.
Main Methods:
- Simulation experiments using LMPA as sealing material.
- Design of a metal plug forming device and gas-tightness detection apparatus.
- Laboratory tests evaluating shear strength, sealing integrity, and failure modes.
Main Results:
- Ultimate shear strength decreases with increasing ambient temperature (~0.225 MPa/°C).
- Forming pressure enhances plug integrity, radial expansion, and sealing.
- Aspect ratios ≥ 3.5 retain >50% sealing capacity post-shear, unlike ratio 2.32.
Conclusions:
- Ambient temperature significantly affects LMPA shear strength.
- Forming pressure is crucial for robust mechanical sealing with LMPA.
- LMPA aspect ratio influences post-failure sealing retention, vital for downhole applications.
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