某高温高压气井超级13Cr钢油管接箍开裂原因  

Cracking Causes of Super 13Cr Steel Oil Tube Coupling in a High-Temperature and High-Pressure Gas Well

作　　者：赵密锋[1] 潘鸿 熊茂县 宋文文[1] 邝献任 龙岩 ZHAO Mifeng;PAN Hong;XIONG Maoxian;SONG Wenwen;KUANG Xianren;LONG Yan(PetroChina Tarim Oilfield Compamy,Korla 841000,China;CNPC Tubular Goods Research Institute,Xi'an 710065,China)

机构地区：[1]塔里木油田分公司,库尔勒841000 [2]中国石油集团石油管工程技术研究院,西安710065

出　　处：《腐蚀与防护》2025年第3期111-117,共7页Corrosion & Protection

摘　　要：西部某油田超级13Cr马氏体不锈钢油管接箍外表面发生开裂。采用宏观观察、化学成分分析、金相检验和力学性能检测等方法,分析了该接箍开裂的原因。结果表明:该接箍开裂类型为硫化物应力腐蚀开裂,裂纹起源于接箍外表面,高温高压油套环空保护液中存在硫化物是导致接箍开裂的主要环境因素。Cracking occurred on the outer surface of the super 13Cr martensitic stainless steel oil tube coupling in a certain oil field in the west.The causes of the cracking were analyzed using methods such as macro observation,chemical composition analysis,metallographic examination,and mechanical property tests.The results indicate that the type of cracking was sulfide stress corrosion cracking,and the cracks originated from the outer surface of the coupling.The presence of sulfides in the high-temperature and high-pressure oil casing annular protective fluid was the main environmental factor leading to the cracking of the coupling.

关 键 词：超级13Cr马氏体不锈钢 接箍 环空保护液 硫化物应力腐蚀开裂 

分 类 号：TG174.4[金属学及工艺—金属表面处理]