西北油田三相分离器腐蚀原因分析及防治对策  

Corrosion Analysis and Prevention Countermeasures of a Three-phase Separator in Northwest Oilfield

作　　者：高秋英[1,2] 王恒[1,2] 张志宏[1,2] 曾文广[1,2] 刘青山[1,2] GAO Qiuying;WANG Heng;ZHANG Zhihong;ZENG Wenguang;LIU Qingshan(SINOPEC Northwest Oilfield Company,Urumqi,Xinjiang 830011,China;Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-vuggy Reservoirs,SINOPEC,Urumqi,Xinjiang 830011,China)

机构地区：[1]中国石油化工股份有限公司西北油田分公司,新疆乌鲁木齐830011 [2]中国石化缝洞型油藏提高采收率重点实验室,新疆乌鲁木齐830011

出　　处：《石油管材与仪器》2021年第6期94-100,共7页Petroleum Tubular Goods & Instruments

基　　金：中石化重点项目课题“站内设备腐蚀评估与防护技术研究”(编号:319016-5);国家重大专项“塔里木盆地碳酸盐岩油气田提高采收率关键技术示范工程”(编号:2016ZX05053)。

摘　　要：针对西北某油田三相分离器严重腐蚀问题,通过金相分析、化学成分分析、X射线衍射分析、细菌培养、腐蚀产物微观表征、腐蚀模拟实验、泥垢对腐蚀的影响及涂层性能测试等对三相分离器材质进行腐蚀失效原因分析,并提出了相应的防治对策。结果表明:三相分离器水线以下内壁首先发生氧腐蚀,并且在由垢层产生的闭塞电池导致的自催化效应与细菌腐蚀的协同作用下,三相分离器水线以下罐体内壁发生快速腐蚀。由腐蚀对策研究成果可知,对三相分离器的材质进行优选,或改变分离器结构可有效改善腐蚀情况。Aiming at the serious corrosion problem of the three-phase separator in northwest oilfield, metallographic analysis, chemical composition analysis, X-ray diffraction analysis, bacterial culture, micro-characterization of corrosion products, corrosion simulation tests, the influence of mud scale on corrosion coating performance test were applied to analyze the specific reasons causing the corrosion failure. The corresponding prevention countermeasures have been proposed. The results show that the oxygen corrosion firstly occurs on the inner wall of the three-phase separator below the waterline. The rapid corrosion occurs on the inner wall of the tank below the waterline under the synergistic reaction of the autocatalytic effect and bacterial corrosion caused by the blocking battery because of the scale layer. According to the results of corrosion countermeasures investigation, the corrosion situation can be effectively improved by optimizing the material of the three-phase separator or changing the structure of the separator.

关 键 词：三相分离器 失效分析 防腐对策 

分 类 号：TE983[石油与天然气工程—石油机械设备]