ATMOSPHERIC AND PRESSURISED MUD GAS SEPARATORS


Kapwell offers two types of MGS: atmospheric and pressurised. The atmospheric type separator is standard equipment on virtually all rigs and is referred to in the field as a “gas buster” or “poor boy” separator. The main advantage of this type of separator is its operational simplicity which does not utilise control valves on either the gas or mud discharge lines. A pressurised MGS is designed to operate with moderate backpressure, generally 50 psi or less. Pressurised separators are used to overcome line pressure losses when an excessive length of vent line is required to safely flare and burn the hazardous gas an extended distance from the rig. The pressurised separator is considered special rig equipment.

The Mud Gas Separator (Poorboy Degasser) forms part of the well control system and plays a critical part in ensuring the safe operation of the rig. The Mud Gas Separator (Poorboy Degasser) is located on or in the vicinity of the drill floor, downstream of the buffer block on the choke and kill manifold. Employed as a safety-critical piece of Well Control Equipment the MGS is used in series with the choke manifold to safely circulate out a gas kick from the well.

The Mud Gas Separator handles a high proportion of mud solids and may experience hydrate plugging as a result of gas expansion through the choke. The liquid seal ensures that separated gas vents safely without breaking through to the mud tanks. The design of our Mud Gas Separator is based on conventional process practice and has adopted the latest notices and publications.

If the drilling rig requires a compact solution, Kapwell can offer a trip tank based liquid seal, where the trip tank is used as a liquid seal, or alternatively, the seal may be in the form of an external U-tube. We can supply either vertical or horizontal MGS, both of which are fitted with internal baffles and distribution nozzles but the performance of the liquid seal is dependent on the chosen design features.

The capacity of the MGS is dependent on the design. If the capacity is exceeded, liquid mud or oil droplets may be carried up through the vent line. More importantly, gas may blow straight through the U-tube (Liquid Seal) and into the shale-shaker house, where there may be potential for explosion and fire. It is essential to verify that the system is capable of handling the maximum amount of fluid and gas that could be produced by the well in the case of a severe kick.

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