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Gas buster is also called poor boy degasser or mud gas separator, it usually worked together with flare ignitor. 
Gas buster is used nearby the well head, when harmful gas is increased during drilling, the valve to solids control system will be closed and the valve of chock manifold will be open , so the gas-invaded mud will flow to gas buster. After treated by the mud gas separator, the harmful gas will be transferred to the flare ignitor which is hundreds of meters away by vent lines, and be ignited by the flare ignition device.
Such equipments are functioned as protection of “KICK” situation in the oilfield.