第四段：射孔段间隔伸长、压缩活动段。

The fourth section: interval elongation and compression activity section on the perforation layer.

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根据对油田套管损坏情况的分析，发现大多数套管损坏部位在射孔段。

According to the analysis about the failure of casing in oil region, most damages occur on the perforated interval.

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为了核实清洗效果，可以采用更低的压力对射孔段进行由底向顶的重复冲洗。

To verify the washing effectiveness, the perforated area was then washed a second time, now from bottom to top, and at a much lower pressure.

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