Study on the Influence of Sn58Bi Alloy on Rock Perforation Plugging Performance.

Area of Science:

• Materials Science
• Petroleum Engineering
• Geotechnical Engineering

Background:

• Conventional cement used for rock perforation plugging faces challenges like brittle fracture, corrosion, and failure under high temperatures and pressures.
• Developing alternative plugging materials is crucial for enhancing wellbore integrity and operational efficiency in demanding environments.

Purpose of the Study:

• To investigate the efficacy of a Sn58Bi alloy as a novel material for plugging rock perforations.
• To analyze the impact of perforation characteristics (length, diameter) and ambient temperature on the alloy's plugging performance.

Main Methods:

• A Sn58Bi alloy was employed to melt and plug rock perforations.
• Experimental testing was conducted to evaluate the alloy's mechanical and hydraulic plugging performance under varying conditions.
• Systematic variations in ambient temperature, perforation diameter, and perforation length were implemented.

Main Results:

• Sn58Bi alloy plugging performance is sensitive to ambient temperature, perforation diameter, and length.
• Mechanical plug performance decreased with increasing ambient temperature (e.g., 24.0% drop from 30°C to 60°C at 100mm length, 10mm diameter).
• Reduced perforation diameter led to decreased mechanical performance but improved hydraulic plugging effect (e.g., 33.7% to 37.2% increase with diameter reduction from 10mm to 6mm at 30°C).

Conclusions:

• Sn58Bi alloy presents a viable alternative to cement for rock perforation plugging, particularly in challenging thermal and pressure conditions.
• Optimizing perforation geometry (diameter) can enhance the hydraulic sealing capabilities of the Sn58Bi alloy.
• Further research is warranted to fully characterize the long-term performance and applicability of Sn58Bi alloy in diverse geological settings.