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针对某油田热采蒸汽驱用隔热管连续发生管柱断裂事故， 做了现场调查和试验分析，主要包括材料化学成分分析、显微断口观察、高倍透射电子显微镜金相组织检查及管材机械性能测定。分析结果认为， 隔热管断裂均发生在经过返修的内管和外管焊接部位， 由于焊接不当， 形成各种形式的初始裂纹， 成为发生断裂的断裂源。另外， 用普通碳钢油管制造的隔热管体（ 内管和外管） 经过长时间在３００℃以上温度下工作， 其显微组织及力学性能已经退化， 极易发生脆性断裂。建议用合金钢管制造隔热管。
Aiming at the continual occurrence of pipe string rupture in heat-insulating steam-driven heat-insulating pipe in an oilfield, field investigation and experimental analysis were done, including material chemical composition analysis, microscopic fracture observation, high-speed transmission electron microscope metallographic examination and pipe mechanical properties Determination. The results show that the rupture of the heat pipe occurred in the welded parts of the inner tube and the outer tube after reworking. As a result of improper welding, various forms of initial cracks were formed, which became the source of rupture. In addition, ordinary carbon steel tubing made of heat-insulated pipe body (inner tube and outer tube) after a long time at a temperature above 300 ℃, the microstructure and mechanical properties have been degraded, brittle fracture prone. It is recommended to manufacture insulated pipes with alloy steel pipe.