裸眼压裂水平气井产能计算及裸眼段贡献研究

Productivity Calculation and Wellbore Section Contribution of Fractured Horizontal Openhole Gas Wells

对压裂水平井的大部分传统研究认为,其产能计算问题可转化为一种"基质—裂缝—井筒"的双重介质模型,即认为地层中的流体先全部流入裂缝,再沿裂缝流入井筒。根据文献[9]的研究成果,对于水平段为裸眼的压裂水平井,这一假设并不符合事实。本文以国际上使用较多的Guo&Evans的裸眼压裂水平井产能模型[1]为基础,分析了它的未全部贯穿油藏的压裂水平井拟稳态产能解,并讨论在水平井的总产量当中,水平段和裂缝各自所占的比例。

Traditional studies on fractured horizontal wells suggest that its production calculation problem can be transformed into the dual media model of ＂matrix - fracture - wellbore＂, namely that all fluid in the formation firstly flows into fractures, and then flows along fractures to the wellbore. According to research results in the literature [91, for openhole horizontal section of the fractured horizontal wells, this assumption is not true. In this paper, based on Guo ＆ Evans productivity model[1] of openhole fractured horizontal wells, pseudo-steady state productivity solution of the model for non-penetrating fractured horizontal wells through the reservoir was analyzed, and percentages of production from the openhole section and production from fractures in total production of the horizontal well were discussed.