... unexpected pay（expenses）不可预见费用 unopened perforation堵塞的射孔孔眼 unrecoverable bridge plug不可回收桥塞 ...
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在近井地带由机械因素造成的渗透率降低，如碎片的驱替堵塞射孔孔眼或地层。
The reduction in permeability in the near-wellbore area resulting from mechanical factors such as the displacement of debris that plugs the perforations or formation matrix.
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