Drilling Spool is an accessory used as a spacer in wellhead equipment.
It provides room between various wellhead devices (such as the blowout preventers) so that devices in the drill stem (such as a tool joint) can be suspended in it.
Drilling spools allow the smooth circulation of mud during drilling operations and usually have the same nominal top and bottom end connections. Side outlet may differ from each other. Top, bottom and side end connections can be hub end or flanged.
|4-1/16"||3M, 5M, 10M, & 15M|
|7-1/16"||3M, 5M, 10M, & 15M|
|11"||3M, 5M, 10M, & 15M|
|13-5/8"||3M, 5M, 10M, & 15M|
|21-1/4"||2M, 5M, & 10M|