Vacuum degassing equipment working theory
In order to separate the gas effectively in the drilling, so an efficient degasser is essential to the safe and productive drilling operations. Since gas is practically insoluble in water, it is relatively easy to detect and remove. By comparison, gas is easily soluble in oilbase muds – its detection is more difficult as well as its removal. Regardless of the composition of the gas encountered, gas existing in the mud can decrease efficiencies in rig pumps, centrifugal pumps and associated operational equipment. The goal is to “Keep the pumps Operating”.
Atmospheric separation relies on impact, turbulence, agitation or a combination of these techniques to separate gas from the fluid. It possesses few moving parts and have low initial cost. But their efficiency is limited and they may not be suitable for all conditions.
Differently, Vacuum degasser has more moving parts and higher initial cost. This is due to the vacuum pump and attendant components primarily. They are, however, much more efficient. Because gas volume is inversely proportional to pressure, gas bubbles in the fluid is more rapid under pressure. By combining impact and turbulence these features with low pressure, modern vacuum degassers proves fast and highly effective in the aspect of separating dissolved gas.
As the purification equipment of oil & gas drilling fluids solids control system, vacuum degasser actually is used to remove little invaded gas in drilling mud. It will be set between shale shaker and mud cleaner/desander. Vacuum degasser separates the gas that migrates into the drilling fluids by the function of vacuum pump and vacuum tubular tank. If the gases does not been separated from the drilling fluids, it may cause well kicked, and increase the total financial cost and timing cost of the drilling project. If there is no gas migrating into the drilling fluids, the vacuum degasser would work as a big mud agitator, to enhance the shearing rate of the drilling mud.