注水井管柱完整性评价及注水参数优化研究

针对塔河油田注水井井筒管柱完整性失效问题，基于氧腐蚀机理模型和ECE模型建立了注水井管柱腐蚀预测模型并验证其可靠性，研究了注采阶段和注水参数对管柱腐蚀的影响规律，建立了基于拉伸失效的注水井管柱失效判据，绘制了不同注水排量和溶解氧浓度下注水井极限允许注水量图版。研究表明，注水井管柱腐蚀主要发生在注水阶段，随注水排量和溶解氧浓度的增加，管柱腐蚀速率增加，允许极限注水总量降低，溶解氧浓度对管柱腐蚀影响更显著，建议重点加强除氧并合理控制注水排量。研究成果有效指导了现场注水作业制度优化，保障了注水井安全生产，提高了油田注水增油综合效益。

Pipe String Integrity Evaluation and Water Injection Parameter Optimization for Injection Wells

Aiming at the integrity failure of water injection string in Tahe Oilfield, based on the oxygen corrosion mechanism model and ECE model, the corrosion prediction model of water injection string has been established and its reliability verified. The influences of injection production stage and injection parameters on the corrosion rate of water injection string have been studied, and failure criterion has been established on the basis of tensile failure criterion. The charts of the limit allowable water injection volume for water injection wells under different injection displacement and dissolved oxygen concentration have been drawn. The results show that the corrosion of water injection well string mainly occurs during the water injection stage; with the increase of water injection displacement and dissolved oxygen concentration, the corrosion rate of the string increases, the allowable limit water injection amount decreases, and the dissolved oxygen concentration has a more significant impact on the corrosion of the string. It is suggested to strengthen the deoxidization and control the water injection displacement. The research results effectively guide the optimization of on-site water injection operation system, ensure the safety production of water injection wells, and improve the comprehensive benefits of water injection and oil increase.