CCUS注采管柱均匀腐蚀及剩余寿命研究

Study on Uniform Corrosion Behavior and Residual Life of CCUS Injection Production String

CO_(2)驱油技术可提高低渗透油藏采收率和减少温室气体排放,但注入CO_(2)会引起注采管柱腐蚀速率增加,导致管材的剩余强度降低,最终使管柱的剩余寿命缩短。基于均匀腐蚀计算模型,模拟某油田不同温度、不同分压以及不同缓蚀剂注入的工况条件,研究了CO_(2)对注采管柱腐蚀行为的影响规律。结果表明:注采管柱的平均腐蚀速率随温度、CO_(2)分压的增加而增加,导致管材的剩余寿命缩短。缓蚀剂能有效降低平均腐蚀速率,延缓管材剩余强度、剩余寿命的降低。试验结果对CO_(2)驱油技术的安全有效实施提供了有力支撑。

CO_(2) flooding technology can enhance oil recovery in low-permeability reservoir and reduce greenhouse gas emissions.However,the injection of CO_(2) causes increased corrosion rate of injection production strings,which reduces their residual strength and remaining life.Based on the uniform corrosion calculation model,this paper simulates the working conditions of different temperatures,different partial pressure,and different corrosion inhibitor injection in an oilfield,and studies the influence of CO_(2) on the corrosion behavior of injection and production well strings.The results show that the average corrosion rate of the injection well string increases with the increase of temperature and CO_(2) partial pressure,which causes reduction of remaining life.The injection of corrosion inhibitor effectively reduces the average corrosion rate of the injection and production string,which slows down the reduction of the residual strength and remaining life.The experimental results support the safe and effective implementation of CO_(2) flooding technology.