undamaged perforation
... uncased hole（well）未下套管井，裸眼井 undamaged perforation无污染射孔 underbalanced perforation负压射孔 ...
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该射孔液体系具有无固相、抗高温、密度可调、稳定性强、配伍性好、对环境无污染等优点。
This perforating fluid system is solid - free, high temperature resistant, stable, compatible, and not polluting.
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