分段射孔水平井产能计算

Productivity of horizontal wells with segmental perforation

分段射孔是一种常用的水平井射孔工艺。由于多个射孔段的存在,使得水平井每个射孔段的产能预测变得十分复杂。用Fourier正弦变换、势的叠加原理、三角函数变换、渐进分析求解圆形封闭地层水平井三维拟稳态渗流问题,得到水平井的均匀流量产量模型。通过与直井产能对比,求得水平井拟稳态当量井径,再利用压降叠加原理建立了分段射孔水平井产能计算方法。研究表明,分段射孔时,相同射孔长度下,端部产量最大,而中部井段产量最小;多个射孔段同时投产时,射孔长度对射孔段产量的影响较射孔间距大。水平井射孔时宜采用中间段长、端部段短的不等距射孔方式,以期达到均衡开采或者注入。此方法可以用于确定水平井射孔段分段产量。

Segmental perforation is widely used for horizontal wells.Due to multiple perforated segments,the production forecast in every perforated segment of the horizontal well becomes complex.Using the Fourier Transform,principle of potential superposition,trigonometric function transform,and asymptotic analyses to solve the pseudo steady-state flow model in 3D circular-boxed media,and the uniform flow rate & production rate model of horizontal well is obtained.After comparing with the productivity of vertical wel...