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 fourth new application was the temporary sealing of a 305-m perforated oil-producing zone to stop severe lost circulation during a workover to drill deeper and to set a liner across a new zone.
第四个新的申请被暂时封闭305米射孔产油区，以阻止严重堵漏中修井钻得更深定班轮跨越一个新的区。
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