The optimization of perforated interval;
射孔长度的优化；
According to the analysis about the failure of casing in oil region, most damages occur on the perforated interval.
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。
The perforated interval is long and perforating gun is in much vibration at horizontal section, which may cause pipe sticking accident.
射孔井段长，射孔枪在水平井段震动大，可能发生卡钻事故。
A section of heavy walled tubing that is placed across any perforated interval through which the production tubing must pass, such as may be required in multiple zone completions.
置于任一射孔层段的一段厚壁油管，这时生产油管必须通过此射孔层段，如在多层完井中所要求的。
A section of heavy walled tubing that is placed across any perforated interval through which the production tubing must pass, such as may be required in multiple zone completions.
置于任一射孔层段的一段厚壁油管，这时生产油管必须通过此射孔层段，如在多层完井中所要求的。
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