摘要
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 m D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。
To better understand the effect of the non-Darcy flow moving boundary, the effect ofnon-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 perme- ability, 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 fl 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 ofnon-Darcy flow moving boundary on production prediction, which improve the accuracy of the productivity prediction.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2015年第1期128-134,共7页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家科技重大专项"西非深水油田注采参数优化及单井产能预测研究"(2011ZX05030–005–04)
关键词
近井地带
高速非达西动边界
雷诺数
产能方程
产能预测
near wellbore
non-Darcy moving boundary of high velocity
Reynolds number
deliverability equation
productivity prediction
