| 摘要 |
Method for enhanced oil recovery in an oil-bearing formation having high permeability zones constituting preferential passages for the injected liquid consisting in: a) treating the preferential passages by injection into the formation of an aqueous solution based on watersoluble polymers at a concentration such that the viscosity of the aqueous solution is higher than that of the oil, b) once step a) is completed, an aqueous solution is injected having an identical composition to that used in b) at a lower polymer concentration. |
