Well Pattern Modification and Injection-production Optimization for Extra-high Water Cut Oilfield

Abstract

The extra-high water cut stage is still an important stage of oil production. In order to develop the oilfield in this stage, a reservoir model was established using the geological and production history data of a block in Shengli Oilfield. Based on the history matching result, the numerical reservoir simulation of the modification was carried out from row injection well pattern to different well patterns. On the basis of residual oil distribution, balanced injection-production and formation pressure distribution, the optimal well pattern for this block was optimized. The well spacing for different well pattern was also simulated. The optimal well spacing was determined by the net present value (NPV) method, and the timing of well pattern modification was determined by the relationship between NPV peak and water cut. Latin hypercube sampling method was used to design the injection-production parameter schemes. The optimal injection and production parameters range of row and nine point well pattern was determined respectively. This research results can be used for reference in the development and adjustment of similar oilfields in the extra-high water cut period.