Advances in Polymer Flooding and Alkaline/Surfactant/Polymer Processes as Developed and Applied in the People’s Republic of China

In this published discussion and reply, Seright critiques the conclusions drawn in Chang et al. (2006) regarding the claimed superiority of colloidal dispersion gels (CDGs) over conventional polymer flooding. Seright challenges the assertion that CDGs penetrate deeply and offer higher resistance factors than HPAM polymers, citing contrary evidence from three university labs. The reply by Chang and co-authors defends their field-scale CDG/polymer results from the Daqing oil field, emphasizing that CDGs can complement polymer flooding by delaying water cut increases and extending project life. Both sides agree on the need for more research to understand the mechanisms of CDG behavior.