RE: RE: :Origins of mud gas If there was a true influx of kick then, with the well shut in for well control, a SIDPP or shut in drill pipe pressure would have been recorded. With that pressure added to the hydrostatic pressure of the drilling fluid column with the mud weight at the time of the kick or influx, the true formation pressure would be known from those facts. Apparently. in this case the mud weight was increased due to mud gas readings and as a safety factor in consideration of well control in the secondary target.