关键词: 聚合物驱, 开发动态, 含水率预测, 注入量, 预测模型

Abstract:

According to the similar variation of water-cut reduction to that of oil production, the oil production prediction models were applied to predict the polymer flooding water-cut reduction. The characteristics and applicability of three typical water-flooding prediction models in polymer flooding, including Weibull Model, General Mr. Weng Model and Ruili Model, were analyzed. The influential factors for the water-cut variation in polymer flooding development were investigated. The main parameters, such as polymer concentration, pore volume of polymer injection, production time, were introduced into a new prediction model. The new prediction model was used to predict polymer flooding water-cut reduction of three blocks in Daqing Oilfield, and good result has been achieved. All the coefficients of correlation between the actual water-cut curves and the predicted curves are over 0.98. Both errors of the predicted lowest water-cut value and injection rate with the actual values are less than 4%. The new model can be used to predict the effects of polymer injection rate, polymer concentration and injection speed on polymer flooding water-cut variation. This model needs a few parameters and is easy in usage.

Key words: polymer flooding, development performance, water-cut prediction, injected volume, prediction model