高温高压气井中超级13Cr油管环空断裂的原因  

Annular Fracture Reason of Super 13Cr Oil Tubing Used in High Pressure and High Temperature Gas Well

作　　者：耿海龙[1] 龙岩 赵密锋[1] 付安庆 张雪松[1] 王鹏[2] 徐鹏海 GENG Hailong;LONG Yan;ZHAO Mifeng;FU Anqing;ZHANG Xuesong;WANG Peng;XU Penghai(Oil and Gas Engineering Research Institute of PetroChina Tarim Oilfield Company,Korla 841000,China;CNPC Tubular Goods Research Institute,Xi’an 710077,China)

机构地区：[1]中国石油塔里木油田公司油气工程研究院,库尔勒841000 [2]中国石油集团石油管工程技术研究院,西安710077

出　　处：《腐蚀与防护》2022年第2期68-73,共6页Corrosion & Protection

基　　金：国家重大专项(2016ZX05051003);中石油股份重大专项(2018E-1809)。

摘　　要：采用化学成分分析、力学性能分析、显微组织观察等分析了服役于高温高压气井环境中超级13Cr油管的环空断裂失效原因。结果表明:失效油管外表面分布大量树枝状裂纹,并具有多层腐蚀产物结构,其断裂属于应力腐蚀开裂,钻井液污染磷酸盐环空保护液是导致失效的主要环境因素,环空保护液漏失形成的高油套压差而导致油管外表面承受高环向拉应力是导致失效的主要受力因素。The aging reasons for annulus fracture failure of super 13 Cr tubing used in a high temperature and high pressure gas wells were analyzed by means of chemical composition analysis,mechanical performance analysis and microstructure observation.The results showed that there were a large number of dendritic cracks on the outer surface of the failed tubing,and the surface had a multi-layer corrosion product structure.The fracture belonged to stress corrosion cracking.Phosphate annulus protection fluid contaminated by drilling fluid was the main environmental factor leading to failure.The leakage of annulus protection fluid led to the formation of high casing pressure difference and thus caused high hoop tensile stress on the outer surface of the tubing,which was the main force factor leading to failure.

关 键 词：高温高压气井 超级13Cr油管 应力腐蚀开裂 环空保护液 

分 类 号：TG172[金属学及工艺—金属表面处理]