Gary W. Nance, Randy Smith Well Control Schools Lafayette, La. Several assumptions and two easy-to-use equations can improve "lubrication," a well control procedure used to displace gas with drilling fluid or completion fluid. The equations are used to make a pressure schedule for monitoring the initial pressure, the pressure increase from pumping kill fluid, and the final pressure after bleeding for each lubrication cycle. These equations are simple to use in the field. There is no need to measure tank volumes or to make rigorous calculations. This method of lubricating gas out of a well is more accurate than the standard...

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