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Gas Buster is also called mud gas separator or poor boy degasser, which is a safety equipment used on oilfield to remove the gas from drilling fluids. The gas in the drilling fluids is coming from underground with very high pressure. The worse is that the gas is always flammable and sometimes poisonous.
Where to the locate the gas buster on an oilfield
It is well known that the solids control equipments are used to remove the solids from the drilling fluids so that the fluids could be reused. Greatly could be saved by recycling the drilling fluids. Strictly speaking, even though the gas buster is not one type of solids control equipment, it always appears together with solids control equipment. Some mud engineers will put gas buster out of but ahead of the mud recycling tank, some ones even directly put the gas buster on the top of the mud tank. When there is drilling fluids coming out from the drilling hole with cut in high pressure gas, unless the gas is removed, the drilling fluids will be not be guided to the shale shakers unit for recycling.
How does gas buster work
The drilling fluids with high pressure gas will be firstly guided to chock manifold for pressure relief. And then the drilling fluids will be guided to gas buster. Inside the gas buster there is a device named distribution pipe which could decompose big bulk gas into small gas bubbles. The gas bubbles coming out of the distribution pipe will directly float upwards and build up at the upper part of the gas buster vessel and then guided out from the pipe at the top of the vessel. The slurry coming down will then transferred to the shale shaker for mud cleaning system.
As mentioned before, the gas separated by the gas buster is always flammable and poisonous. It cannot be discharged to environment directly. The usual practice is to guide the gas somewhere 50-100 meters far away from the rig and the burnt by an igniter device.
Gas buster and igniter device are not used very often, they are just like the fire extinguisher. However, to a oilfield drilling site, especially a deep drilling site, they are indispensable.