Ann: Borba Gas Shows Continue, page-96

'Trip' gas manifests itself in the form of higher gas levels once 'bottoms up' is circulated after a round trip. The theory behind this is similar to connection gas (reduction in bottomhole pressure when the pumps are off, allowing more gas to enter the borehole from the formation).

Connection gas, background gas and trip gas viewed in isolation do not mean very much. They should be considered as trends to be observed and related to formation samples returned and potential downhole pressure trends.