聚合物驱是油田开发中后期增产稳产的重要措施,但胜利孤东油田在实施聚合物驱后,油井管杆不同程度地出现了较水驱管杆腐蚀更加严重的问题.通过室内试验研究了聚合物驱采出液矿化度、温度、聚合物浓度、含砂量、搅拌速率、细菌含量等因素对管杆腐蚀的影响,分析了聚合物驱采出液较水驱采出液腐蚀性更强的原因.聚合物驱采出液含有的残余聚合物本身有一定的缓蚀效果,但影响不大,残余聚合物引起的采出液粘度增加、携带悬浮物的能力增强以及细菌腐蚀加重是导致聚合物驱采出液腐蚀性较重的主要原因.

Polymer flooding is an important measure to the production stabilize and increase in the latter period of oil field development.However,after using polymer flooding,the tube wells in Gudong Oil Field exhibit more serious corrosion.The influences of salinity,temperature,polymer concentration,amount of sand,stirring rate,bacterial content of polymer flooding on corrosion rate were analyzed.The remnant polymer of polymer flooding has some corrosion inhibition effect,but with the increase of polymer content,the corrosion rate caused by polymer flooding increases,and becomes more serious than that caused by water flooding due to the increase of viscosity and capacity of suspended solids and bacteria in polymer flooding.