一种新型水驱特征曲线的推导及应用

Derivation and application of new type of water flooding characteristic curve

李珂 杨莉 张迎春 皮建

（中海油研究总院，北京 100028）

(CNOOC Research Institute, Beijing 100028, China)

文中分析了现有油水相对渗透率曲线指数式表征方法的局限性，指出在低含水时期或特高含水期时，采用指数式相渗表征方法得到的常规水驱曲线对生产动态数据进行拟合将出现较大误差。继而，基于油水相对渗透率曲线Krw/Kro的非指数型特征，文中提出一种新的水驱特征曲线，并详细论述了该水驱特征曲线广义表达式、含水率上升规律表达式的推导过程。实例应用表明，采用文中水驱曲线，对低含水期、中高含水期水驱开发过程中的生产数据拟合和指标预测均具有较好效果，在各含水阶段的可采储量预测结果也具有较好的一致性。

In this paper, the author analyzed the limitation of the exponential characterization method of water-oil relative permeability curve. The conventional water flooding characteristic curve based on the exponential water-oil relative permeability curve will bring larger error in the results of production index fitting. Then, a new type of water flooding characteristic curve is proposed based on the non-exponential feature of Krw/Kro. The author demonstrated the derivation process of its expression. The new type of water flooding characteristic curve is convenient and widely adaptable. It can be characterized by the whole process of water drive rule from the low water cut stage to the special high water cut stage. Application examples show that under the low water cut stage, the new curve can accurately describe the water flooding process, fit the production index and forecast the cumulative production of low and high water cut stage. The predicted results of the recoverable reserves in each water cut stage also have good consistency.

10.6056/dkyqt201606023