下钻TRIPPING IN THE HOLE 卸掉卸扣器，下放钻柱让钻头缓慢通过转盘。Remove breaker and carefully lower bit through rotary table.
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Thus, stable hole, smooth drilling and tripping operations and zero outage time have been obtained in the construction period.
使该井在施工期间，井壁稳定、起下钻井眼畅通，全井事故、复杂时效均为零。
Although most of kicks occur when pulling the drill string from the hole, it is also possible for kicks to occur while tripping in.
尽管大多数井涌都发生在起钻的时候，但下钻的时候也会发生井涌。
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