套管柱顶部的一根大口径管，形如漏斗，以引导钻井工具进入到井眼的顶部。
An enlarged pipe at the top of a casing string that serves as a funnel to guide drilling tools into the top of a well.
T- 4001塔顶部大口径管道因吊车的有效吊装高度所限，不能随塔吊装，在其吊装后，再用CC 8800吊装此管线。
T-4001 big caliber pipeline is limited in height because of its available suspending height and could not suspend with the tower freely. After suspending it, use CC8800 to install this pipe cable.
T- 4001塔顶部大口径管道因吊车的有效吊装高度所限，不能随塔吊装，在其吊装后，再用CC 8800吊装此管线。
T-4001 big caliber pipeline is limited in height because of its available suspending height and could not suspend with the tower freely. After suspending it, use CC8800 to install this pipe cable.
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