Based on the analyses of Arps production decline law and changes of remaining reserve-production ratio. a simple and convenient method for estimating decline factors and recoverable reserves during decline period in any oil- field was presented.

• 通过对Arps产量递减规律与油田剩余储采比变化规律关系的分析，给出了一种计算递减期油田递减指数与可 采储量的简便方法。