Study on new profile control agents suitable to offshore oilfields and its application

This paper describes the difficulty in and necessity of implementing profile control of water injection wells in offshore Chengdao Oilfield.Based on the adaptability analysis of several kinds of profile control agents,a new type of briny agent is developed,which consists of modified maeromolecule polyacrylamide and Cr3+organic complex and metallic ion complexing agent.The results show that the crosslinking time can be controlled,the strength of gel can be adjusted,and the plugging rate is high.It is used in Well CB251A-6,good result are obtained.The result also provides good reference to other wells of Chengdao Oilfield.