在井中清理射孔孔道所用的一种方法。
射孔孔眼具有相对较大的直径，而且射孔孔道很深。
The perforations have a relatively large diameter and the perforation tunnel is deep.
为提供旁通近井地带损害等所需的长射孔孔道而设计的射孔弹。
A perforating charge designed to provide a long perforation tunnel, such as may be required to bypass any near-wellbore damage.
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