油田注水配注合理注采比计算方法研究

Research on a new calculation method for rational injection-production ratio of water injection allocation of oilfield

为了稳定油藏原油产量、控制含水上升速度,需要确定油藏在注水开发过程中的合理配注量或注采比。通过应用油藏工程方法中广泛使用的经验公式和理论公式推导出了新的注采比随含水率变化预测模型。该模型直观表达了油田累积产油量与含水率关系及油田注采比随含水率变化的关系,其特点在于给定未来某一时刻油田含水率,就能确定其合理注采比。通过实例计算表明,应用该关系式计算结果可靠,参数获取简便,可用于指导生产静动态参数录取较少的区块油藏进行配注计算。

In order to stabilize the oil production, control water cut and realize the reasonable and effective oilfield development, it is necessary to determine the reasonable allocation quantity or the injection-production ratio. On the basis of the theory formula used in the reservoir engineering method, a new formula that injection-production ratio changes with water ratio is established. This method intuitively expresses the relationship O{ the oilfield cumulative oil production and water ratio and the relationship that the oilfield injection-production ratio changes with the water ratio. Its advantage is that if a future oilfield water ratio is given, the reasonable injection-production ratio can be determined. The calculation by an example shows that the calculated result is reliable by the relationships. The method of calculating parameters is simple, and it is very suitable for the reservoir which only has less production static and dynamic parameters.