四点井网含水率与采出程度关系的确定

含水率和采出程度是油田开发的关键指标。由于低渗透油藏存在非达西渗流特征,目前还无法通过理论方法计算得到含水率与采出程度的关系曲线。文中以四点井网为例,应用单元分析方法和油水两相渗流的流线积分方法,推导出适用于低渗、特低渗油藏的开发指标计算方法,并在此基础上求取了含水率与采出程度的关系曲线。油田实例应用表明,该方法具有一定的可靠性,可为油藏开发指标的预测、开发设计及注水开发评价提供理论依据。

Determination of relationship between water cut and recovery percent of four-spot pattern

The water cut and recovery percent are the key indicators of field development. But at present, the relationship between water cut and recovery percent can not be obtained for low permeability reservoir with theoretical methods because of its non-Darcy flow characterstics. Taking four-spot pattern as an example, this paper uses the element analysis method and flow line integral method of oil-water two phase flow to deduce the calculation method for development indicators of low and ultralow permeability reservoirs. Based on this, the relationship curve between water cut and recovery percent is obtained. The application results of real field show that this method has certain reliability. It can provide theoretic foundation fur development indicator prediction, development design and water flooding development evaluation ofoil reservoirs.