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Casing Head
The casing head in a conventional wellhead system is the lowest part of the wellhead assembly and is almost always connected to the surface casing string. It supports the remaining parts of the wellhead and completion equipment. The casing head performs the following functions: Provides a means for attachment to the surface casing string.
Functions
◆ Provides for attachment to surface casing string.
◆ Supports blowout preventers while hole is drilled for next casing string.
◆ Provides for suspending and packing off the next casing string.
◆ Provides outlets for annular access.
◆ Provides for testing BOPs while drilling.
C-22
Features
◆ C-22 accepts C-21 non-automatic sealing casing hanger w/ type H seal ring, C-22 & C-122 automatic sealing casing hanger.
◆ C-22-BP-ET has bowl-protector lockdown screws in the top flange.
◆ C-22 eliminates the need for lockdown screws to retain bowl protectors.
◆ Bottom preparation can be either male-threaded, female-threaded, slip-on weld or Slip Loc.
Benefits
◆ Straight bowl prevents wedge-locking of bowl protectors, casing hangers and test plugs.
◆ Seal bore less likely to be damaged during drilling.
◆ Detachable base plate available for C-22 heads provides time savings and adds value due to better utilization of customer-owned property.
◆ C-22-EG reduces number of leak paths, lowers cost and increases safety as there is no need to work beneath the BOPs.
C-29
Features
◆ C-29 offers same features as industry standard C-22 with the exception of the EG option.
◆ C-29-ET has multiple lockdown screws in top-flange which retain the hanger and can be used to energize the hanger packoff seal.
Benefits
◆ Deeper bowl accepts C-29/C-129/C-229/C121-S extreme-load casing hangers in addition to other FMC Surface Wellhead casing hangers.
◆ The lockdown screws of the C-29-ET can also be used as bowl-protector hold-down screws.
