低渗透油藏中水平井的产能公式分析ANALYSIS ON PRODUCTIVITY FORMULA OF HORIZONTAL WELLS IN LOW PERMEABILITY RESERVOIR
宋付权,刘慈群,张盛宗
Song Fuquan; Liu Ciqun & Zhang Shengzong (Research Institute of Seepage
;Flow Fluid Mechanics;
摘要(Abstract):
用近似方法得出了各类边界供给油藏中的水平井产量公式。考虑启动压力梯度,根据水平井的椭球流态理论,通过平均质量守恒方法得到了椭球供给边界油藏中水平井的稳态产量近似公式,以及底水油藏中水平井的稳态产量近似公式;通过修正得到了含启动压力梯度的边水油藏中水平井的稳态产量公式。并给出了相应的无量纲产量公式和工程产量公式。分析表明,当启动压力梯度较小时,对产量的影响也很小,随着启动压力梯度的增大,影响增强,产量下降。
Horizontal
well production formula for various kind of boundary drainage reservoirs is obtained by using
approximation. Considering the starting pressure gradient, the approximation formula of
horizontal well static production are obtained for both ellipsoidal drainage boundary reservoir
and bottom water reservoir based on ellipsoidal flow pattern theory and through average mass
conservation method. After correlation, static production formula including starting pressure
gradient is obtained for horizontal wells in edge water reservoir. And corresponding
dimensionless production formula and engineering production formula are given. Analysis
shows that, when the starting pressure gradient is relatively low, its effect on oil production is
also small. With the increase of starting pressure gradient, the effect will become greater and
production will decrease greatly.
关键词(KeyWords):
水平井,低渗透油藏,启动压力梯度,产能公式
Horizontal well, Low permeable reservoir, Starting
pressure gradient, Productivity formula
基金项目(Foundation):
作者(Authors):
宋付权,刘慈群,张盛宗
Song Fuquan; Liu Ciqun & Zhang Shengzong (Research Institute of Seepage
;Flow Fluid Mechanics;