电潜泵井防腐工艺探讨

Study on Anti-corrosion Process for ESP Well

中国石油化工股份有限公司中原油田分公司文留油区电潜泵井腐蚀较为严重,腐蚀程度达到Ⅳ级以上的电泵井占统计总数的22.9%。电泵机组使用缓蚀剂,因不能预膜处理,总体上虽有一定效果,但易腐蚀部位防腐效果较差。在电泵机组应用牺牲阳极保护装置之后能使电泵机组和油管不再被腐蚀,只有当防腐器上的较活泼金属消耗完后,电泵机组和油管才会发生电化学腐蚀。缓蚀剂对电泵机组和油管的防腐具有均衡性,牺牲阳极保护技术对油管的防腐具有重点性,将二者结合使用,可取得较好效果。牺牲阳极防腐装置工艺简单,安装方便,缓蚀率高,对地层无伤害,能有效减少井液对电泵机组和油管管柱的电化学腐蚀,降低腐蚀速率,延长电泵机组和管柱的使用寿命。

The ESP wells in Wenliu Oil Area of SINOPEC Zhongyuan Oil Field Company corroded seriously, and the number of ESP wells with corrosion of Grade IV and plus accounted to 22.9% of the total. When corrosion inhibitor was used for electric pump train, the corrosion prevention result was poor in corrosive locations because of being incapable of performing pre - filming treatment. When sacrificing anode cathodic protection unit was installed for the electric pump train, the electric pump train and oil pipe were no longer corroded. The electric - chemical corrosion only occurred when the active metals were consumed. Good corrosion prevention can be achieved by integrated application of corrosion inhibitor and cathodic protection because the corrosion inhibitor provides a balanced corrosion protection for electric pump train and sacrificing anode cathodic protection offers a concentrated corrosion protection for oil pipes. The sacrificing anode cathodic protection unit, which is simple in process, easy in installation, high in corrosion prevention performance and little in harm to the soil, can effective reduce the electric - chemical corrosion of well liquid on electric pump train and oil pipes and extend their service life.