下套管是指当井钻至预定深度后需要固井时，把套管逐一连接下人井内的作业。而对所钻的油气井通过下套管注水泥以封隔油气水层加固井壁成为固井。
用350吨卡瓦式吊卡下套管。
文章就目前广泛采用的下套管和泥浆两项措施作了论述。
In this paper two extensively adopted technical measures at present, ceasing and mud flushing, are discussed.
虽然我在这时候，我阴顶部边缘，所以我不需要折为下套管下摆。
While I was at it, I overcast the top edge so I don't need to fold under a hem for the casing.
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