DETERMINATION OF THE COEFFICIENT OF THE COSTS DURING THREAD OUT THROUGH THE FITTING / VALVE FOR DRILLING UNDER CONTROLLED PRESSURE

摘要

A method has been created for determining the flow rate at flow through a nozzle / valve for drilling under controlled pressure as a function of the valve opening position. The method comprises: supplying air / gas through a nozzle / valve; measuring the air / gas flow rate at the inlet of the choke / valve and measuring the pressure drop of the air / gas flow at the choke / valve.