Research on prediction method of subsequent water flooding index of an oilfield

Production Management Room, Institute of Geology, No.6 Oil Production Plant, Daqing Oilfield Company Limited, Daqing 163000, China

Abstract

With the gradual end of polymer flooding in polymer flooding blocks of type II oil reservoirs, the scale of subsequent water flooding production and injection in oil fields is increasing. As can be seen from the subsequent water flooding production, due to different factors such as reservoir properties and injection-production rates, various indicators in the block vary greatly, which brings difficulties to the prediction of indicators in the later stage. Therefore, it is urgent to carry out follow-up research on the change law of water-flooding related indexes to provide scientific basis for index prediction and index control. Based on a large number of actual production data of oil field, the influencing factors of index change are analyzed, and the variation law of actual index of subsequent water flooding in oil field is made clear. By fitting the actual production data of successive water flooding blocks over the years, the empirical formula which accords with the water flooding characteristic curve and production decline of an oilfield is given.