دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: See below packer bourdon tube case.

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: The casing float shoe in which is installed by check valve. There are two kinds of ball float shoe: cement and aluminum alloy.

n: a cement wiper plug that precedes cement slurry down the casing. The plug wipes drilling mud off the walls of the casing and prevents it from contaminating the cement. See cementing, wiper plug. bottompull method n: an offshore pipeline construction technique in which the pipe string remains below the surface while it is towed to its final location.

n: See bottom wiper plug.

in cementing, the first plug pumped in cementing with the two plug system. It isolates the mud and cement slurry and allows passage of the cement slurry when the plug “bumps” or reaches the float shoe or float collar. It is hollow with a diaphragm that is

n: a milling device attached to the bottom of washpipe that mills or drills debris accumulated around the outside of the pipe being washed over. Usually, a bum shoe has pieces of very hard tungsten carbide embedded in it. Also caned a rotary shoe. See washpipe.

n: A kind of tool for handling downhole accident. Used to mill the casing and drill pipe which are stuck in the wellbore. See drill mill.