海上热采井井筒管柱腐蚀研究及应用  

Research and application of wellbore string corrosion in offshore thermal production wells

作　　者：于晓涛 刘志龙 吴婷 董世超 万芬 辛野 柳沣洵 YU Xiaotao;LIU Zhilong;WU Ting;DONG Shichao;WAN Fen;XIN Ye;LIU Fengxun(Engineering Technology Company of CNOOC Energy Development Co.,Ltd.,Tianjin 300452,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300452

出　　处：《复杂油气藏》2021年第4期112-115,120,共5页Complex Hydrocarbon Reservoirs

基　　金：国家科技重大专项“规模化稠油热采技术研究示范”(2016ZX05058-003-005)。

摘　　要：为防止海上稠油热采作业中井筒管柱出现腐蚀现象,加快稠油热采规模化应用进展,对海上热采现场作业后的井筒管柱进行形貌观察、机械性能检测、能谱检测以及室内模拟试验等方法进行腐蚀分析,结果表明:井筒管柱在热采井中的腐蚀主要由于高温、氯离子和氧离子共同作用。针对腐蚀原因,优化工艺方案和提高设备性能,降低井筒中氧、氯含量。现场应用表明,优化后可有效减缓井筒管柱腐蚀速度。In order to prevent the corrosion of wellbore string in offshore heavy oil thermal recovery operation,and accelerate the progress of the large-scale application of heavy oil thermal recovery,the corrosion analysis of wellbore string after offshore thermal recovery site operations was carried out by the means of morphology observation,mechanical property detection,energy spectrum detection,and indoor simulation test.The results show that the corrosion of the wellbore string in the thermal recovery well is mainly due to the combined action of high temperature,chloride ions,and oxygen ions.According to the cause of the corrosion,the process plan was optimized and the equipment performance was improved to reduce the oxygen and chlorine content in the wellbore.The field application shows that the optimized technology can effectively slow down the corrosion rate of wellbore string.

关 键 词：腐蚀 隔热油管 氧腐蚀 氯离子 稠油热采 蒸汽吞吐 

分 类 号：TE53[石油与天然气工程—油气田开发工程]