产量递减阶段储采比变化规律

Variation of Reserves Production Ratio in Production Decline Stage

产量递减阶段是油田开发的重要阶段,它将延续至油田开发的终结。目前,预测油田递减阶段产量变化的主要方法是Arps递减法,尤其是指数递减法,在实际应用中更为普遍。在Arps双曲递减基础上,利用预测油田可采储量和剩余可采储量的快速方法,提出了判断油田递减阶段储采比变化规律的方法。指数递减法的储采比不随时间而变化,是一个常数;双曲递减的储采比与时间的关系是一条上升的直线。通过两个油田实例表明,对于稳产和递减阶段,本文提出的判别储采比变化规律的方法是正确的。

In process of oil field development, production decline is an important stage of it and occurs by the end. At present, the main method for prediction of the production change in decline stage is Arps＂ method, in which exponential decline approach is widely used. Based on hyperbolic decline curve of Arps and integrated with the rapid method for prediction of recoverable reserves and remaining recoverable reserves of oil field, this paper proposes a method for judging the variation of reserves production ratio in production decline stage of a field. It is shown that the reserves production ratio in exponential decline stage is a constant, not changing with the time of development, while that in hyperbolic decline stage is a rising straight line with the time. The case from two fields indicates that the method for judging the variation of reserves production ratio is correct in both exponential decline stage and hyperbolic decline stage.