Abstract
This study evaluated the potential for application of nitrogen injection to Dujiatai which is a water-flooding reservoir developing for decades. ECLIPSE PVTi module of simulation was employed to determine N2-oil MMP (Minimum miscibility pressure) which is as a criterion for screening. Then, through nitrogen flooding development scheme design and index prediction of a typical well group, we get the optimal water alternating gas (WAG) scheme. The optimal scheme can obvious increase the reservoir recovery for the next decade, which can be a useful development method for similar water-flooding reservoirs.
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