Method of improving heterogeneous oil reservoir polymer flooding effect by positively-charged gel profile control

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Zhao, Ling^1 ; Xia, Huifen^1

School of Northeast Petroleum University, Heilongjiang

163318, China^1

关键词: Application prospect;    Environmental pollutions;    High permeability;    Injection pressures;    Percentage points;    Positively charged;    Profile control technology;    Three-dimensional networks;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/2/022004/pdf
DOI  :  10.1088/1755-1315/108/2/022004

来源: IOP

【 摘 要 】

The project of polymer flooding has achieved great success in Daqing oilfield, and the main oil reservoir recovery can be improved by more than 15%. But, for some strong oil reservoir heterogeneity carrying out polymer flooding, polymer solution will be inefficient and invalid loop problem in the high permeability layer, then cause the larger polymer volume, and a significant reduction in the polymer flooding efficiency. Aiming at this problem, it is studied the method that improves heterogeneous oil reservoir polymer flooding effect by positively-charged gel profile control. The research results show that the polymer physical and chemical reaction of positively-charged gel with the residual polymer in high permeability layer can generate three-dimensional network of polymer, plugging high permeable layer, and increase injection pressure gradient, then improve the effect of polymer flooding development. Under the condition of the same dosage, positively-charged gel profile control can improve the polymer flooding recovery factor by 2.3∼3.8 percentage points. Under the condition of the same polymer flooding recovery factor increase value, after positively-charged gel profile control, it can reduce the polymer volume by 50 %. Applying mechanism of positively-charged gel profile control technology is feasible, cost savings, simple construction, and no environmental pollution, therefore has good application prospect.