压裂水平井水电模拟产能影响因素研究

Study on Influencing Factors of Productivity in Fractured Horizontal Well by Hydro-power Simulation

针对目前确定压裂水平井产能增加的最优井及裂缝参数组合较困难的问题。应用水电相似理论以及正交试验设计以及增产倍比比较法,确定了低渗透油藏压裂水平井各单因素对于压裂水平井产能的贡献大小。得出产能最大化时的最优井与裂缝的参数组合,绘制了最优水平井以及裂缝参数实验的等压线形态。同时通过极差分析的方法确定了影响压裂水平井产能各参数单因素的敏感性强弱顺序,得出当低渗透层基质渗透率为30 mD时,水平井段长度60 m、水平裂缝半长9 m、裂缝高度7 m、裂缝间距9 m、裂缝条数2条,裂缝与水平井间夹角为75°时对压裂水平井产能增加效果最优。同时,该方法为低渗透油田水平井压裂施工水平井实现高产能井参数以及裂缝参数优化设计提供理论指导。

In order to solve the problem of determining the optimal well and fracture parameter combination, the water and electricity similarity theory, the orthogonal experiment design and the comparison of yield ratios were used to investigate the influence degree of each single factor on the production capacity of fracturing horizontal well. The optimal horizontal well and crack parameter combination for maximizing the capacity were determined, and the contours of the optimal horizontal well and the crack parameters were drawn. At the same time, the sensibility sequence of these factors affecting the productivity in fractured horizontal well was determined. It＇s found that when the permeability of the low permeability layer was 30 mD, the horizontal fracture half-length was 60 m, the crack spacing was 9 m, the fracture height was 7 m, the fracture spacing was 9 m, the number of cracks was 2, and the angle between the crack and the horizontal well was 75°,the best effect of increasing the productivity of fractured horizontal wells was obtained. At the same time, the sensitivity and order of single factors influencing the production capacity of fractured horizontal well were determined by means of range analysis method, which could provide theoretical guidance for optimal design of fracture parameters for fractured horizontal wells in low permeability oilfields.