中国石油大学学报（自然科学版）2026，Vol.50Issue(1)：212-221,10.DOI:10.3969/j.issn.1673-5005.2026.01.021
井下低熔点合金封堵套管的密封性
Sealing propertry of sealing casing with low melting point alloy
摘要
Abstract
For the sealing performance between Bi-based alloys and casing in downhole low-melting-point metal plugging,an experimental setup for alloy plug formation and gas sealing was constructed.Then,experiments were conducted to evaluate the pressure bearing capacity and gas sealing performance of the alloy plug after bonding with the casing.The microstructure of the sealing interface was analyzed using optical microscopy,and the effects of axial pressure and ambient temperature on the sealing performance of the alloy plug were investigated as well.Experimental results show that the sealing performance of the formed alloy plug is significantly influenced by ambient temperature.As the ambient temperature increases,the bonding capability between the alloy plug and the casing weakens,leading to a reduction in pressure-bearing capacity.During the so-lidification and formation of the alloy plug,the application of axial pressure is beneficial for enhancing its pressure-bearing and gas sealing capabilities.When the alloy plug is displaced,shear failure and movement occur at the interface with the in-ner wall of the casing,but the gas sealing performance is not entirely damaged.As a novel material for downhole casing plug-ging,Bi-based alloys can achieve casing sealing through the expansibility of the material itself.关键词
Bi基合金/密封性能/合金塞成型/轴向压力/套管封堵Key words
Bi-based alloy/sealing performance/alloy plug formation/axial pressure/casing plugging分类
能源科技引用本文复制引用
查春青,陶文超,朱治国,李栋,郑建锋,王政国,柳贡慧,汪伟..井下低熔点合金封堵套管的密封性[J].中国石油大学学报（自然科学版）,2026,50(1):212-221,10.基金项目
国家自然科学基金-联合基金项目(U23B2081) （U23B2081）
