Theoretical exploration of water injection gravity flooding oil in ultra-deep fault-controlled fractured-cavity carbonate reservoirs

YANG Xuewen,WANG Rujun,DENG Xingliang,LI Shiyin,ZHANG Hui,YAO Chao

Table 1 Comparison of production parameters of different types of reservoir units in Fuman Oilfield

Unit type Reservoir characteristics Productivity Oil pressure drops per 1×104 t liquid/MPa Energy evaluation Water cut characteristics Dynamic reserve recovery degree of flowing production stage Strong natural energy connected type Good continuity Stabilize before water breakthrough, decrease rapidly after water breakthrough <1 Strong No water in the early stage, rising sharply after breakthrough Relatively high Weak natural energy connected type Poor continuity Decreased slowly 1-10 Relatively weak No water Relatively low Weak natural energy isolation type Very poor continuity Decreased rapidly >10 Weak No water Low