Bell Nipple

bell note 钟的音调

A large swage nipple for attaching casinghead fittings to the well's casing above the ground or at the surface. The bell nipple is threaded on the casing end and has a plain or weld end to take the casinghead valves.

Bell Nipple [tubo curto colocado acima do preventor anular com uma saída lateral para retorno do fluido de perfuração e outra para o enchimento do poço]

A flow-diverting nipple installed above the well control stack. The top end of the nipple is expanded (belled) to guide workstring tools into the hole and usually has side connections for attaching the fill line and the mud returns line.