Status and Prospect of Improved Oil Recovery Technology of High Water Cut Reservoirs

The high water cut stage is an important of the injection development oilfields because there are still more oil reserves available for recovery in this stage. Most have experienced decades waterflooding and adjustment. Although reservoirs face problems seriously watered-out highly dispersed distribution remaining oil, they remain dominant waterflood development. This paper investigates current situation high-water content methods to improve elaborates on fine reservoir description. Furthermore, it analyzes main technical measures taken during period, namely, secondary technology (including layer system subdivision, well pattern infilling, strengthening liquid extraction, closure wells, cyclic technology, profile control) tertiary (represented by chemical flooding gas flooding). In addition, study reveals mechanisms effects these improving Finally, summarizes improved discusses key directions prospects enhancing rate.