充填防砂井表皮系数研究

从砾石充填防砂井的基本渗流规律出发，将流量的自动分配引入近井各个阻力区，剖析每个阻力区的流速变化，采用压降的形式，推导出了射孔炮眼穿出钻井污染带与未穿出钻井污染带时，污染带与炮眼内流动的层流表皮系数和紊流表皮系数;将常规径向渗流的紊流表皮系数的分析方法引入裂缝渗流紊流表皮系数的分析，导出了压裂充填的紊流表皮系数;同样考虑流速在射孔孔眼附近的急剧增加，推导出了压裂充填的汇聚表皮系数。计算结果与数值解的时比，反映了以上方法的合理性。

STUDY OF SKIN FACTORS FOR THE FILLED SAND CONTROL WELL

Basis on the gravel packing sand control theory, the flux distributing into each resistance section was introduced in the paper. The changing of velocity of flow was analyzed，the laminar skin and the turbulent skin in the damage district and the shot hole were derived with the pressure drop when the perforalions were through the contaminated district or not. At the same time, the turbulent skin and the convergence skin for frac-packing were presented. By the contrast between the model of this paper and numerical value, the formulas of this paper were in reason to provide theoretic base for sand control gravel packing.