Constant Pressure Drilling Fluid Mud Gas Separator

The mud gas separator  is designed to provide effective separation of the mud and gas circulated from the well by venting the gas and returning the mud to the mud pits.  Small amounts of entrained gas can then be handled by a vacuum-type degasser located in the mud pits. The mud/gas separator controls gas cutting during kick situations, during drilling with significant drilled gas in the mud returns, or when trip gas is circulated up.

Features and Benefits of Mud Gas Separator

1. Constant pressure drilling fluid mud gas separator is a specialized equipment used for primary degassing of gas-cutting drilling fluid,it is mainly used to remove big bubbles whose diameter ≥φ3mm.

2. Mud gas separators produced by DC have the advantages of safety and reliability,good treatment effect,long service life ,etc.

3. Constant pressure Anti-H2S drilling fluid mud gas separator manufactured by DC adopts high quality material , can effectively prevent the erosion of harmful gas and ensure production safety of man and machine.

4. The separated gas is transported to a safe area by the discharge line for combustion.

Mud Gas Separator Parameters

Operation Principle of Mud Gas Separator

The operating principle of a mud gas separator is relatively simple. The device is essentially a vertical steel cylindrical body with openings on the top, bottom, and side. The mud and gas mixture is fed into the separator inlet and directed at a flat steel plate perpendicular to the flow. This impingement plate minimizes the erosion wear on the separator’s internal walls and assists with mud/gas separation. Separation is further assisted as the mud/gas mixture falls over a series of baffles designed to increase the turbulence within the upper section of the vessel. The free gas is then vented through the gas vent line, and mud is returned to the mud tanks.

Operating pressure within the separator is equal to the friction pressure of the free gas venting through the vent line. Fluid is maintained at a specific level (mud leg) within the separator at all times. If the friction pressure of the gas venting through the vent line exceeds the mud-leg hydrostatic pressure within the separator, a blow-through condition will result in sending a mud/gas mixture to the mud tanks. As one can readily see, the critical point for separator blow-through exists when peak gas flow rates are experienced in the separator. Peak gas flow rates should theoretically be experienced when gas initially reaches the separator.

Mud Gas Separator Considerations

1. Gas kicks in oil-based mud can approach “possibly soluble” conditions while the kick is circulated from the well.

2. Gas kicks in Mud Gas Separator that pass through the gas bubble point while being circulated from the well can experience higher Pcmax and Vcmax values than were calculated for a kick of the same initial pit gain in a water-based mud. This results in higher peak gas flow rates through the separator and thus the requirement for a more stringent separator design.

3. Gas kicks in Mud Gas Separator that do not pass through the gas bubble point until the gas is downstream of the choke will severely affect mud/gas separator sizing and design. Peak gas flow rates will be extremely high relative to those calculated for water-based mud, as outlined in this paper. Additional evaluation of the separator sizing should be completed if these good conditions exist.

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