注采比与产水率的关系研究

Research on relationship between injection-production ratio and water cut

为了改进钟德康推导的砂岩油田注采比曲线的通用预测公式,基于王怒涛关于甲乙型和丙丁型综合水驱特征曲线的研究成果,结合注水开发砂岩油田的注采关系曲线,推导出了预测注采比变化规律的甲乙型和丙丁型注采比曲线。两类曲线方程均表明注采比变化全过程是水油比(含水率)的单值函数,根据方程可以预测油藏开发后期的注采比或产水率。实例应用研究结果表明,丙丁型注采比曲线有时并不适用。此外将实际注采比曲线与理论图版进行拟合,得到拟合效果较好的n值,从而可以反过来确定哪一种水驱特征曲线可更好地描述油藏的开发动态。

In order to improve the universal prediction equation derived by Zhong Dekang for injection-production ratio curve of sandstone oilfield,this paper derives AB and CD injection-production ratio curve to predict the change pattern of injectionproduction ratio based on Wang Nutao＇s research results on AB and CD water drive characteristic curve and combined with the injection-production relational curve of water injection development for sandstone oilfield.The two types of curve equations indicate that the change of injection-production ratio is a function of the single value of water-oil ratio（water cut）.The injection-production ratio or water cut at the late stage of reservoir development can be predicted according to the equations.The results of example application indicate that CD injection-production ratio curve is not applicable sometimes.In addition,we can get the best value n by matching the practical injection-production ratio curve with the theoretical one,conversely determining which type of water drive characteristic curve can be used to describe the reservoir development performance preferably.