非均质油藏注水开发指标计算方法的改进

A CORRECTION TO THE BUDGETARY ESTIMATING METHOD USED IN THE DEVELOPMENT DESIGN FOR WATERFLOODING RESERVOIR

概算法是油田开发设计过程中进行开发指标预测最常用的方法，其基本思想是运用一维两相流动理论来研究水驱油过程的规律。同时运用概率统计的方法，研究油层渗透率分布的非均质状况，最后推导出非均质油藏水驱开来时各项指标的计算公式。国外在这方面提出的一些方法，仅对油水两相流动的处理方法有不同；国内从事这方面研究的专家也相继提出了一些方法，并不断改进和完善。但所有这些方法都不同程度地存在不足，共同的问题是在无因次时间的定义和处理上有误，从而导致在相同注入倍数下所计算的开发指标及最终采收率偏高而存水率偏低。在前人工作的基础上，针对这一问题，重新推导了一套非均质油藏水驱开来时各项指标的计算公式，并用油田实例进行了验证。所有计算结果无论是从理论上分析还是与油田实际资料对比，都证实了新方法的可靠性。

The budgetary estimating method is widely used in the prediction of development indexes for the oilfield development design.Several methods abroad are similar except for the treatment of two phase (oil and water) flow . Some methods were raised andimproved in succession in our country. But, all the methods have much or less deficiency. A complete set of predicting development indexes for heterogeneous water flooding reservoir have been derived based on the previous methods and tested in this paper. The feasibility of the method is confirmed theoretically and practically.