油藏开发单井产能非均质性定量表征

Quantitative Characterization of Unit Productivity Heterogeneity of Reservoir Development

通过油藏单井产能非均质性分布特征研究,提出了1种油藏开发非均质程度定量表征新参数。将油藏开发任一时期的单井产能按降序排列,分别计算出每1口井的产能累计贡献率及其对应的序数百分数,在直角坐标系中绘制出产能累计分布曲线,通过倒数坐标转换将不同形态的产能累计分布曲线转换成斜率介于0～1之间的直线,将1与斜率之差定义为产能非均质程度系数。累计产能非均质程度系数与油藏采出程度、采油速度的关系表明,从开发初期至开发后期,油藏开发非均质程度在不同开发阶段增长速率不同,其变化规律能够用以评价同类型油藏的开发效果。

A new parameter of qualitatively characterizing heterogeneity of reservoir development is proposed based on the study on the distribution characteristics of a single well productivity of a reservoir.A single well productivity is arranged in a descending order in any period of development;the accumulative contribution percentage of productivity and its corresponding order percentage of each well are calculated;accumulative productivity distribution curves are plotted in a rectangular coordinate system;the difference of 1 and slope is defined as heterogeneity coefficient.The relation of accumulative productivity heterogeneity coefficient and recovered percentage and production speed shows that the heterogeneity of reservoir development in different development stages is different and the variation regularity can be used to evaluate the development effectiveness of similar reservoirs.