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Installation and Operation of Mud Gas Separator

mud gas separator

The mud-gas separator separates the free gas from the contaminated mud leaving the choke manifold before it is routed to the degasser. Entrained gas is extracted at the degasser.
The mud-gas separator can be installed as:

  • A skid mounted horizontal or vertical unit outside a mud tank;
  • United with the trip tank.

The size of the mud-gas separator should be such that it can handle the fluid and gas which is bled off via the choke manifold safely. Minimum dimensions and configurations of various types of mud-gas separators are given in (click link).
The following shall be met when configurating the pipe work for the mud/gas separator:

  • There are to be no valves, pipe expansion or contractions within 3 m (10 ft) of the inlet nozzle;
  • If a bend is required in the feed pipe it shall be in a vertical plane through the axis of the feed nozzle;
  • The pipe reducer of the gas outlet line should be no nearer to the top of the vessel than 0.6 m (2 ft).

The gas outlet line shall be a minimum of 200 mm (8″). If the vent exists more than 40 m (130 ft) from the vessel this vent line diameter should be increased to ensure that the back pressure in the vent line does not exceed 15 kPa (2 psi), at a gas flowrate of 0.2 x 106 m3 (st)/d (7 MMscf/d). No reduction in any vessel dimension is permitted.
No other internals (e.g. mist mats) are permitted due to their unsuitability for the rugged service.
The mud-gas separator shall have one or more vent lines leading a safe distance downwind from the well.  Low places in the vent lines should be avoided in order to prevent liquids being trapped in them.
Never connect the choke manifold and/or mud-gas separator discharge lines directly to the degasser (always have an open pipe).

The mud-gas separator shall not be operated above its design limitation. Operating outside of this envelop will give poor mud/gas separation and the possibility of gas blow through. An additional unit with dedicated vent line shall be installed when the mud-gas separator capacity is insufficient for the well to be drilled.

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