Connection Gas
Connection Gas is the term used for gas observed on bottoms up after making a pipe connection. It indicates the amount of gas that enters the well bore during connection. Pipe connection causes loss of annular pressure losses effect as the pumps are turned off. The bottom hole pressure in this static condition is equivalent to only the hydrostatic pressure of the mud column. Gas feeds into the well due to the loss of hydrostatic pressure caused by the loss of annular friction pressure. Connection gas is an indication that formation pressure is more than the hydrostatic pressure of the column of mud in a hole in static condition. An increasing trend of connection gas would indicate the need for increasing mud weight to balance the formation pressure.