Protected hydro-mechanical cemented liner hanger PHGMCZ

Hydro-Mechanical Cemented Liner Hanger PHGMC with increased carrying capacity is
designed for RIH, hanging and sealing in of a liner in a cemented well; performing of technological operations connected with cementing and sequential actuation of an anchor unit
and a packer unit and further automatic disconnection of transport string from the liner
and transport string pulling out.
PHGMCZ hanger is a complex of four stand-alone and independent units:

• hydraulic anchor;
• hydraulic release mechanism;
• mechanical packer;
• mechanical disconnection to back up hydraulic release mechanism.

The hanger is provided with a number of interlocks: hydraulic disconnection and hydraulic
anchor are protected against early actuation before the hollow suspended plug is cut, the
packer unit may be actuated only after disconnection.
The hanger consists of 2 parts: adjustment tool and the hanger itself, the latter includes
packer unit, anchor unit and lead-in funnel.
When using hangers like PHGMCZ the following technological operations are performed:

• RIH of the device as a part of a transport string liner;
• washovers without pressure limitation;
• performing of liner cementing with running of the cementing plug after the injection
  of the cement slurry for its separation from the displacement fluid;
• displacing of the cement slurry to the outer annular space of the liner with limited
  displacement pressure after the suspended plug is cut off (no more than 75% of
  disconnection pressure) and receiving of “bump” signal;
• anchor unit actuation with internal overpressure build-up to 14 MPa;
• hydraulic breaking unit actuation with pressure build-up to 20 MPa;mechanical breaking
  unit actuation with transport string rotation to the right;
• packer unit actuation by partial uploading of the transport string weight onto the “head”
  part of the liner;
• washover and pulling out of the transport string.