Trip gas is any gas that enters the mud while tripping the pipe with the hole appearing static. Trip gas will be detected in the mud when circulating bottoms up occurs after a round trip.

If the static mud column is sufficient to balance the formation pressure, the trip gas will be caused by swabbing and gas diffusion.

Significant trip gas may indicate that a close to balance situation exists in the hole. Gas Due to Inadequate Mud Density

Surface indication of an underbalanced formation depend on the degree of underbalance, as well as the formation permeability. Drilling of a permeable formation that is significantly overbalanced will cause an immediate flow increase followed by a pit gain.

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