打开不完善井的合理产能评价

Productivity Evaluations of Partial Penetrating Wells

常规计算公式无法对打开不完善生产井的产能进行准确评价。通过分析产能的影响因素,利用镜像反映及势的叠加原理推导出了三维空间下部分射孔完井的产量表达式,并编制程序分别计算了不同储层特征、不同打开程度及不同射开位置情况下的射开厚度折算系数,通过多元回归获得了综合考虑各种影响因素的简易射开厚度折算系数表达式,进而建立了打开不完善井的产能评价模型。算例计算结果表明,提出的射开厚度折算系数法可以对各种打开程度的生产井进行产能评价,应用方便且精度高。

Conventional productivity formula can not accurately evaluate the productivity of partial penetrating well.Based on theories of mirror reflection and potential superimposition,a three-dimensional productivity equation for partial penetrating well is derived by analyzing effect factors on well productivity.Software is programmed to calculate the perforation thickness correction coefficients for different perforation level and position in different reservoirs;the simple correction coefficients of above are obtained by multiple regression considering all factors,and the productivity evaluation model of partial penetrating well is built.Example calculation result shows that the correction coefficient proposed can be used to evaluate the partial penetrating well＇s productivity with different perforation level with high accuracy.The productivity evaluation model proposed can be used to evaluate the productivity of partial penetrating well in target field.