低渗透油藏中水平井的非牛顿幂律流体不稳定渗流的研究

从水平井椭球流态出发，对于非牛顿幂律流体，在椭圆坐标内分析了具有启动压力梯度的低渗透油藏中水平井的稳定及不稳定压力动态，即椭球供给边界油藏中的近似压力分布和产能公式；分析了启动压力梯度对原油生产的影响；启动压力梯度增大，产量降低；对于不稳定渗流，得到了双重孔隙介质含启动压力梯度油藏中非牛顿流体水平井的三维不定常试井公式，并绘制了理论图版，所得近似的压力分布公式以及试井公式均有常规项（不考虑启动压力

Study of Unsteady Flow of Non-Newtonian Power Law Liquid in Horizontal Wells of Low Permeability Reerrvoir

Proceed from elliptic flow pattern of horizontal wells, with regard to Non-Newtonian power law liquid, this paper analyzes, in elliptic coordinates, steady and unsteady pressure behavior of horizontal wells in low permeability reservoir with threshold pressure gradient(TPG), i. e. approximate pressure distribution and productivity formula in elliptic supply bounded reservoir; it also analyzes the effect of TPG on oil production: TPG increases while production rate decreases. To unsteady flow, the three dimensional indeterminate well testing formula of Non-Newtonian power law liquid for horizontal wells in double porosity.reservoir with TPG is generated and theoretical type curves are drawn up, the approximate pressure distribution formula and wen testing formula generated both have regular term (without consideration of TPG) and TPG term, and featured with simple form and easy to be understood and applied;the effect of Non-Newtonian power law exponent and TPG on well testing curve is discussed as well, i. e. the larger the early time power law exponent, the bigger the increase range of dimensionless bottom hole pressure differential; the larger the late time power law exponent, the smaller the increase range of dimensionless bottom hole pressure differential,while the larger TPC, the bigger the bottom hole pressure differential.