The Casing spool has a top bowl to accommodate the casing hanger. The spool also has a bottom bowl with a pack off seal and a flange or lamp hub for mounting it on top of a casing head or previous spool. Outlets are provided for annular access. Multiple casing spools may be stacked to hang intermediate and production casing strings.
Casing spools are also straight bore bowl design. Bottom preparation can be either for P-seals or X-bushing types secondary seals, outlets are normally 2 1/16” studded with 1 1/2” VR plug profile.
Casing spools provide interchangeability of casing hangers. If a bowl protector is required during the drilling process, hospital using a C-22 SOW casing head, including lock down screws in the upper flange would be recommended. Alternatively, a hold down flange with lock screws can be used.
C-22 Casing Spool
The C-22 Casing Head Spools are straight bore bowl design. Bottom preparation can be by P-Seals or X-busing secondary seals. Outlets are normally two inch threaded; optional studded or flanged outlets are available.
C-22 Casing Heads and Spools provide interchangeability of casing hangers C-22 and C-21. If a bowl Protector is required, a hold down flange with lock screws can be used.
C-29 Casing Spool
The C-29 straight bore casing spools are based on the same reliable design as the C-22 with exception that the bowl is two inches longer, which permits the acceptance of the minimum-deflection C-29 Casing Hanger.