Optional Threaded Bottom

The Casing Head is the lowermost head in a wellhead system. It is connected to the surface casing by one of several possible methods. The upper connection of the casing head is usually flanged and connects to the next wellhead – as well as the BOP’s during the drilling process.

  • Provides an attachment and sealing point to the surface casing.
  • Allows for pressure testing of the weld when a SOW bottom is used.
  • Allows for support and testing of a BOP system while drilling out for the next casing string.
  • Provides a casing hanger load shoulder and bowl for hanging and sealing of the next casing string.
  • The load shoulder and bowl also accommodate BOP test plugs.
  • Provides two outlets for annular access and monitoring.
  • Provides a means for Wear Bushing installation and retention.
  • Can be supported by the conductor pipe via an optional base plate.
  • C-29 bowls available for extreme casing loads.
  • Either bowl will accept a C-21 Casing Hanger for low weight situations.

Base Plates are custom made and pre-installed depending on customers needs.

  • Bottom Connections available in the following profiles:
  • Slip-on Weld (SOW) with internal o-ring (outside only weld)
  • Slip-on Weld (SOW) no o-ring (outside and inside weld)
  • Threaded female casing thread
  • Threaded male casing thread
  • Slip-Lock (weld-less) Locks to casing with slips energized via studs
  • Lock-down Pins
  • Full set of pins to secure mandrel casing hangers (suffix “L”)
  • BP pins (bowl protector) to secure wear bushings while drilling (suffix “BP”)


  • Threaded 2” LP (LPO)
  • Threaded EUE 8rd
  • Side studded outlets (SSO) with internal VR prep
  • Extended flanged outlets (EFO) with internal VR prep