Abstract:

Through practice of lifting up polymer flooding target to underproductive performed in west of row 1 and 2, the developing area of central Sartu, Daqing oilfield, as well as profile modifying agent dosage calculation before polymer flooding and formula deduction, the applied profile modifying agent dosage and its economics calculation model are determined. On the basis of above practice, simulated calculations of the target formation profile modification depth and its economics are performed. After the comparison between the simulated result and the optimal profile modification depth obtained in the key productive formations, it is finally determined that, with a well spacing of 175 meters, and the given profile modifying agent of expandable particle crosslinker, the most effective profile modification depth in underproductive formations is 60 meters.

Key words: profile modification, depth, polymer flooding, under productive formations, Daqing oilfield