316L液控管线在海上热采井中的腐蚀分析及对策

Corrosion Analysis and Countermeasure of 316L Hydraulic Control Pipeline in Offshore Thermal Wells

为研究海上稠油热采作业中316L液控管线腐蚀现象,加快稠油热采规模化应用前进的步伐,对海上热采现场作业后的316L液控管线进行管线材质分析、拉伸性能测试、宏观观察、微观观察以及管线上残余油泥成分分析。分析结果表明:316L液控管线在热采井中的腐蚀主要是由Cl-引起,且工作环境中的O2、高温、应力等加速316L液控管线腐蚀。针对腐蚀原因,优化热采工艺方案,并建议采用耐腐蚀性更强的材料。现场应用结果表明,825液控管线在稠油热采井中工作良好,作业期间压力稳定,满足现场要求。

In order to study the corrosion phenomenon of 316L hydraulic control pipeline in offshore heavy oil thermal recovery operation and accelerate the progress of large-scale application of heavy oil thermal recovery,the pipeline material analysis,tensile property test,macro-observation,micro-observation and residual oil sludge composition analysis of 316L hydraulic control pipeline after offshore thermal recovery field operation were carried out. Results showed that the corrosion of 316L pipeline in thermal recovery wells was mainly caused by Cl- and accelerated by O2,high temperature and stress in working environment. In view of the causes of corrosion,the thermal recovery process was optimized,and the material with stronger corrosion resistance was recommended. Field application results showed that 825 hydraulic control pipeline worked well in heavy oil thermal recovery wells,and the pressure was stable during operation,which met the field requirements.