多段压裂水平井产能预测常用解析模型适用性与精度分析

    Adaptability and accuracy analysis of the commonly used analytical models for productivity prediction of horizontal well with multistage hydraulic fracturing

    • 摘要: 多段压裂水平井在非常规油气中的应用越来越频繁,解析求解多段压裂水平井可以快速获取油气井的产能,为开发方案的制定奠定基础。本文筛选了多段压裂水平井的常用解析模型(郎兆新方法、范子菲方法以及苗和平方法),并采用商业数值模拟软件建立数值模型进行对比,分别从压裂裂缝参数、油藏属性参数以及水平井参数三个方面评价各个模型的适用性及其精度。研究结果表明,各个解析模型之间的预测差异主要是对于基质和裂缝中流体向水平井段的流动过程的处理方法不同造成的;低渗致密储层中,范子菲方法和苗和平方法的预测精度较高,而范子菲方法在拟合水平井和裂缝参数上也具有一定的优势。本文研究结果对非常规储层多段压裂水平井产能预测解析模型的选择具有指导意义。

       

      Abstract: Horizontal well with multistage hydraulic fracturing has been frequently used in the unconventional oil/gas reservoirs.Analytical models to solve the horizontal well with multistage fractures can help engineers quickly obtain the productivity of the well and lay the foundation to formulate the development strategy.In this paper, the commonly used analytical models including Lang model, Fan model as well as Miao and Wang model are selected to compare with the numerical simulation results by commercial software.To evaluate the adaptability and accuracy of these three analytical models, the comparison parameters involve hydraulic fractures, reservoir properties and horizontal well.The results show that the differences of the prediction results by the three models is mainly ascribed to the treatment of the fluid flow process through matrix and fractures to horizontal well.In fitting the reservoir properties, these three models have both their advantages and disadvantages.Fan model performs better in fitting the parameters of horizontal well and fractures.This paper provides the guidance for the selection of analytical model to predict the productivity of multistage horizontal well in unconventional reservoirs.

       

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