预测水平井产能的一种新方法

对目前采油工程与油藏工程中广泛采用的几种水平井产能预测公式进行了分析,尤其对Joshi产能公式进行了重点分析,提出了在水平井产能计算时应采用有效渗透率较符合现场实际。同时还指出了Joshi水平并偏心产能公式的错误,进一步利用镜像反映原理推导出一种水平井产能预测的新公式,并利用现场实际油井参数进行了计算,其实际生产值与计算值相对误差小于17.5%,与Joshi公式的计算值对比计算精度高。建议在油田水平井产能预测中进一步验证。

A NEW METHOD OF PREDICTING THE PRODUCTIVITY OF HORIZONTAL WELL

This paper analyses some productivity forecast equations of horizontal well,specially Joshi's equation, used in reservoir engineering,thinks that the effective permeability should be used in calculating horizontal well productivity, points out the error existing in Joshi's equations,and then derives a new equation for predicting horizontal productivity applying mirror effect theory. Field applications show that the relative error between practical and calculated value is less than 17%, and that calculation result is more accurate than that of Joshi's equations.