近井地带高速非达西动边界对产能预测的影响

针对高速非达西动边界对产能影响的问题，开展了考虑高速非达西动边界影响的产能方程的建立。研究中采
用渗流理论和惯性理论推导了高速非达西动边界公式和对应的产能方程。并基于对动边界的认识不仅提出了高速非
达西出现的临界渗透率、临界产量和临界压差的概念，而且提出了高速非达西边界表皮因子。研究表明，只有储层渗
透率、产量或者压差大于临界值时，储层中才可能出现高速非达西渗流；而且高速非达西边界表皮是渗透率、孔隙度、
临界雷诺数以及β 的函数反映了地层性质对高速非达西区域的影响，表皮越大则高速非达西区域越小，动边界的影响
越不能忽略。最后与常规产能方程比较发现，渗透率在1～10 mD 时，本文产能方程的IPR 曲线与其有明显的差异。提
出了高速非达西动边界对产能预测的影响，提高了产能预测的精度。

Effect of Non-Darcy Flow Moving Boundary of High Velocity Nearby Wellbore on Productivity Prediction

To better understand the effect of the non-Darcy flow moving boundary，the effect of non-Darcy flow near wellbore
caused by high velocity on productivity prediction was studied. Based on seepage theory and inertial theory，the non-Darcy
moving boundary equation and a new deliverability equation are derivated. Then we proposed the concepts of critical permeability，
critical productivity and critical pressure，and the non-Darcy boundary skin factor. Only when permeability，gas rate
and pressure are all larger than critical value，non-Darcy flow appears. And a non-Darcy moving boundary skin factor is a
function of permeability，porosity，critical Reynolds number and β expressions，which reflects the effect of the petrophysical
properties. And the larger the skin is，the narrower the moving boundary is and the greater its effect. Finally，a comparison with
conventional deliverability equation revealed that，if the permeability range is 1～10 mD，significant differences exist in these
IPR curves. This paper proposed the effect of non-Darcy flow moving boundary on production prediction，which improve the
accuracy of the productivity prediction.