两种变形的ΚΟΠЬΙΤΟΒ衰减曲线研究

Yu Qitai; Wang Zhigang.A STUDY ON TWO TRANSFORMED KOPITOV DECLINECURVES.

对衰减曲线进行了研究，提出了两种变形的衰减曲线公式，其中一种为通式，另一种相当于Ａｒｐｓ双曲线递减指数ｎ＝０．５时的衰减曲线公式。提出了变形的衰减曲线递减参数的求解方法；用实际油田数据比较了它们的误差大小，推荐了误差较小的递减参数计算公式。油藏的调整措施与否对其递减规律有很大影响，因此应当根据油藏类型与是否实施调整措施来选择衰减曲线公式。

Kopitov decline curve was examined and two transformed formulae of it werepresented:one is general formula,the other corresoonds to the case with decline index n=0.5 of the Arps’hyperbolic curve.The method for getting decline parameters of transformeddecline curve was presented.Results were compared with actual production data,thereby re-commending the formula with smaller error. Adjustment measures of reservoir produced greateffects on decline patterns, Thus,the formula of decline curve should be selected according totypes of oil reservoir and adjustment measures to be used.