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=====Flowline===== ...Loss of gas from the mud to the atmosphere also occurs extensively in the flowline<ref name=pt03r17 />, particularly when

...from the wellhead pressure if the wellhead pressure is at least twice the flowline pressure. For an oil well, the Gilbert equation is commonly used:

...ace between the drill pipe and the borehole). Returning mud flows down the flowline (24) into a ''[http://www.glossary.oilfield.slb.com/en/Terms/s/surge_tank.a