涠洲11-4油田含CO_2气井油管柱腐蚀分析  

Analysis on tubing corrosion for gas wells with CO_2 in WZ 11-4 oilfield

作　　者：张超 张智[2] 曾春珉 黄亮 许发宾 李晶[2] 

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057 [2]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《中国海上油气》2015年第4期122-125,130,共5页China Offshore Oil and Gas

基　　金："十二五"国家科技重大专项"大型油气田及煤层气开发(编号:2011ZX05023-004)";中国海洋石油总公司"十二五"科技重大专项"东方13-1气田高温高压钻完井关键技术研究(编号:CNOOC-KJ 125 ZDXM12 LTD)"部分研究成果

摘　　要：海上钻完井安全可靠性要求高,尤其是含CO2气井油管柱的工作环境恶劣,油管柱容易受到腐蚀,仅按照API/ISO、GB/SY标准设计并不能完全保证油管柱在服役过程中的完整性。以涠洲11-4油田某含CO2气井为研究对象,在油管柱腐蚀形貌分析的基础上进行了管柱材料物理化学性能分析,进而借助现代计算流体力学方法,模拟计算了井下安全阀附近油管柱内的流场分布。结果表明,在流动通道变化明显区域,受CO2分压、高温和腐蚀性组分的协同作用,油管柱将会出现严重的流场诱导腐蚀现象,流道结构与腐蚀之间存在协同效应。本文研究有利于识别井下油管严重腐蚀部位,可以为优化设计油管柱结构提供参考。Offshore drilling and completion demands high safety and reliability, in particular, the service en- vironment of tubing in gas wells with CO2 is harsh and the tubing is likely to be corroded. In consequence, designing only according to API/ISO and GB/SY standards cannot guarantee the integrity of the tubing in service. A research was conducted for a gas well with CO2 in WZ 11-4 oilfield to analyze the physical and chemical properties of the material based on the analysis of tubing corrosion morphology. Then, on the foundation of modern computational fluid mechanics, the distribution of flow field within the tubing near the subsurface safety valve was computed. The result shows that in the area with significant variation of flow channel, severe flow-induced corrosion phenomenon will occur in the tubing due to the synergistic im- pact of CO2 partial pressure, high temperature and corrosion components. And correlation exists between the channel structure and corrosion. The research can facilitate identifying the corrosion zone of downhole tubing and provide optimization for tubing structure design.

关 键 词：涠洲11-4油田 含CO2气井 油管柱 流场诱导腐蚀 

分 类 号：TE983[石油与天然气工程—石油机械设备]