低渗透油田童氏参数改进及应用分析

Modification of Tong′s parameter of low permeability reservoir and its application

水驱特征曲线法是注水开发油田评价开发效果、标定可采储量、预测含水率变化的一个重要手段,童宪章院士根据特定油田的生产数据统计出水驱控制地质储量与甲型水驱曲线公式斜率的倒数之间存在7.5倍关系,并提出了童氏图版法。但在实际应用中发现,7.5倍关系及7.5倍童氏图版对于低渗透油田并不适用。文中在对甲型、乙型水驱曲线和童氏图版的研究基础上,推导并提出适合类似吉林油区的低渗透油田的注水开发效果评价分析方法。通过对含水率与采出程度、采收率的关系式及甲型水驱曲线斜率的倒数与地质储量关系的研究得出,低渗透油田的童氏参数应该由7.5修改为13.5。同时改进了含水上升率和存水率2项重要注水开发效果评价指标在低渗透油田应用的公式,更加系统地提出了适合低渗透油田的水驱效果评价方法。

The water drive curve is an important method to evaluate the development efficiency, calculate the oil recovery efficiency and predicate the water cut in the water injection field. Academician Tong Xianzhang proposed that the water displaced original oil in place volume is 7.5 times the reciprocal of the slope of Type A water drive curve according to the analysis of many oilfields ′dynamical production data. He also proposed the Tong′s curve method. But for low permeability oil fields those laws aren′t suitable according to the practical applications. According to the research of Type A water drive curve, Type B water drive curve and the Tong′ s curve, we derived and proposed the development efficiency analysis method which is suitable to the low permeability reservoir such as Jilin Oilfield. After studying the relationship of water cut, recovery percent of reserves and recovery factor and studying the relationship of the water displaced original oil in place volume and the slope of the Type A water drive curve, we modified the Tong′s parameter from 7.5 to 13.5 for the low permeability water injecting reservoir comprehensively. Meanwhile, we modified the formulation of the water cut increasing rate and the water storage rate for low permeability reservoir.