射孔密度、射开厚度、孔眼直径及临界流速增加时，砾石充填最小排量也增加。
The minimum injection rate of gravel pack increases while increasing the diameter of perforation tune, the perforation density, the perforated thickness and the critical velocity.
射孔孔眼具有相对较大的直径，而且射孔孔道很深。
The perforations have a relatively large diameter and the perforation tunnel is deep.
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