ANALYSIS AND DISCUSSION ON THE ANTICORROSION MECHANISM OF TUBING IN INJECTION WELL

Based on the vast amount of field investigation of tubing corrosion in injection wells the anticorrosion mechanism is analyzed and discussed in light of the actual situation in Honggang oilfield,in which clean water is injected in southern part and sewage injected in north.The main fator to causo the corrosion of downghole tubing in clean water injection wellsis the dissoyed oxygen,which leads to the Well-distributed corrosion in the outer surface of tubing.Carbon dioxide,hydrogen sulfide and sulfate reducing bacteria result in the even corrosion and the serious pitting corrosion in the tubing exterion for the sewage injection wells besides the dissolved oxygen.This paper presents the revelant realistic technology measures,thus laying an important foundation for the solution of corrosion problem in injection well.