The main functions of degasser are two aspects: first is ensure the drilling fluid performance is relatively stable, avoid blowout, well kick, ensure the well drilling is safe; the second is ensure the hydrocyclones can work normally. The degasser must be provided when drilling deep well, gas well and oil & gas well. Usually, there are vacuum degasser and poor boy degasser in oilfield.
The vacuum degasser suck the drilling mud and separated mud and gas by vacuum pump. The drill mud enters into the tank and distributed to a layer of internal baffle plates engineered to allow the liquid inside the vacuum degasser to flow as thin film and is exposed to the vacuum within the vessel. This layer of mud allows the gas to escape or break out of the mud. The vacuum pump releases the gas and discharge it to the disposal line. Mud exits the vessel under the action of the venturi and returned to the mud system.
The poor boy degasser worked by the physical characters. It consists of a cylindrical pressure vessel in a fixed vertical position. Inside is a series of specially angled baffle plates, stepped from the top to the bottom. When contaminated mud is routed into the separator, it flows downward successively over each plate. During this process, the heads of entrained gases “break out.” The released gas is then carried by the vent lines to a remote location where it can be safely flared. The flow of liquid from the vessel can be regulated by a liquid-level-control valve or a U-tube, ensuring adequate retention time in the separator for the gas to break out.