دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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

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 classified float collar installed in the same casing when three-level cementing. Used for secondary cementing. See regular stage collar.

adj: in cementing operations, pertaining to a cement plug that comes to rest on the float collar. A cementing operator may say, Ive a bumped plug" when the plug strikes the float collar.

n: see float collar.

n: The collar with back pressure control valve, installed at the bottom of casing string. Prevents drill fluid entering into casing and decreases the weight of casing by buoyance. Also prevent cement recirculating when cementing.

n: See casing float collar.

n: The cement liner in casing guide shoe or float collar.

n: See casing float collar.

n: A special liquid pressure-sensing piston valve installed in casing guide shoe or casing float collar.

n: the casing float with two inverted valves ,used to improve the security of cementing operation