微粒运移伤害是疏松产层一种比较普遍又相当严重的地层伤害。
The particle migration damage is a kind of general and serious damage of unconsolidated producing formation.
下部地层以石灰岩、泥页岩、砂岩为主，地层疏松，易漏失，属低压高产地层。
The lower formation is consisted of loose limestone, shale and sandstone, with low formation pressure coefficient.
具体到渤海高渗透疏松砂岩，这些环节包括绕丝筛管、砾石充填层、射孔孔眼、压实带及近井原状地层。
For high permeability and loose sand in bohai, these links are composed of wire wrapped screen, gravel packing zone, perf, skin and near wellbore undisturbed formation.
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