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The adapter between the first casing string and either the BOP stack (during drilling) or the wellhead (after completion).
在第一根套管柱和防喷器组(钻井时)或完井后的井口之间的一个接头。
This adapter may be threaded or welded onto the casing, and may have a flanged or clamped connection to match the BOP stack or wellhead.
该接头也许是用螺纹与套管连接在一起，或焊接在一起，以及可能还有一个法兰或卡箍连接与防喷器组或井口配接。
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