Perforation effect is seriously affected by the clearance between perforator and casing.

射孔枪与套管之间的间隙过大会影响射孔效果，太小容易出现工程事故。

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Perforation effect is seriously affected by the clearance between perforator and casing.

射孔枪与套管之间的间隙过大会影响射孔效果，太小容易出现工程事故。

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