دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

control unit n: see automatic driller.

n: The equipment controlling the bit weight automatically during drilling.

n: The automatic operation that lands the drill stem automatically through the device controlling bit pressure to make the bit pressure sustained during drilling.

n: See automatic feed.

n: a device usually installed on the first joint of casing to regulate automatically the amount of mud in the casing. The valve in this shoe keeps mud from entering the casing until mud pressure causes the valve to open, allowing mud to enter.

n: The float shoe that is installed in the bottom of the casing string and can adjust the volume of drilling fluid in the casing. There is a valve in the float shoe. Only when the pressure of drilling fluid is big enough to open the valve can the drilling fl

n: a measuring device installed on the outside of a tank to permit observation of the depth of the liquid inside.