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。
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