三孔双渗油藏非牛顿幂律流体试井分析

Well Test Analysis of Non-newtonian Power Law Fluid in Triple-pore and Double-permeability Reservoirs

针对裂缝和溶洞与井筒连通,同时存在溶洞和裂缝、基岩和裂缝、基岩和溶洞之间发生拟稳态窜流的三孔双渗介质,建立了三孔双渗油藏非牛顿幂律流体的试井模型。通过Laplace变换和Stehfest数值反演对模型进行求解,绘制了相应的典型无因次压力曲线图版。分析了三孔双渗油藏非牛顿幂律流体的渗流规律,分别讨论了影响试井特征曲线的因素,对比分析了三孔双渗油藏非牛顿幂律流体的试井特征曲线与三孔双渗油藏牛顿流体的试井特征曲线的区别,所得的结果有利于提高对三孔双渗油藏非牛顿幂律流体渗流规律的认识,为三孔双渗油藏非牛顿幂律流体的试井解释奠定基础。

In view of the intercommunication of fractures and caverns to well bore and simultaneously existing of pseudo-steady state channeling between caverns and fractures;matrix and fractures;and matrix and caverns,a well test model for non-newtonian power law fluid in a triple-pore and double-permeability reservoir is established.By means of Laplace transform and the Stehfest numerical inversion method,the solution of this model is got and typical dimensionless pressure curves are plotted;permeable flow regularity of non-newtonian power law fluid in a triple-pore and double-permeability reservoir is analyzed;factors which affect the shape of the well-test characteristic curves are discussed;and the difference between well-test characteristic curves of non-newtonian power law fluid in a triple-pore and double-permeability reservoir and the well-test characteristic curves of newtonian fluid in a triple-pore and double-permeability reservoir is comparably analyzed.The results can help people to understand permeable flow regularity of non-newtonian power law fluid in a triple-pore and double-permeability reservoir and also lays the foundation for well test interpretation of non-newtonian power law fluid in a triple-pore and double-permeability reservoir.