一种锥型，通常是圆头引导器形状的器件，一般出现在套管柱的最下端。

A tapered, often bullet-nosed piece of equipment often found on the bottom of a casing string.

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一种锥型，通常是圆头引导器形状的器件，一般出现在套管柱的最下端。

A tapered, often bullet-nosed piece of equipment often found on the bottom of a casing string.

youdao