دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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 device placed in the cementing head and run down the casing in front of cement to clean the mud off the walls of the casing and to prevent contamination between the mud and the cement.

n: A cementing tool used to clean the drilling fluid in the wellface and prevent drilling fluid invading cement slurry. Installed in the cement casing head and threw into the wellbore before cementing.

n: 1. a portion of cement placed at some point in the well bore to seal it. 2.a wiper plug. See cementing, wi per plug.

n: (1) a portion of cement placed at some point in the wellbore to seal off the well;(2) a device used during a primary cement job to separate the cement slurry from contaminating fluids in the casing. A wiper plug is pumped ahead of the slurry and a shut-o

a plug of cement set by various methods that plugs the tubulars or the open hole.

n: an accessory attached to the top of the casing to facilitate cementing of the casing. It has passages for cement slurry and retainer chambers for cementing wiper plugs. Also called retainer head.

n: The servicing unit installed in the top of casing string for cementing. It is installed with rubber plug and connected with cement injection line.

a device attached to the top of the casing that allows connection of the flush and cement lines and allows plugs to be dropped. Special models may allow the cement to be rotated during cementing.

n: two brushing plugs of the oil tube being connected together ,and both of them set abaft the cement slurry in order to scape the sundries adhered on the wall of the oil tube

n: one of the auxiliary tools when pull the pipe out of the hole
,used to scrape off the coherent fluid out of the drill pipe

n: a kind of tools assembly in which a rolling cutter reamer

is joined among two or three drill collars and a stabilizer is joined on each end of the drill collar respectively

n: two monolithic stripper rubbers are sulphurated into this tool

n: the tool is used in well repair and well completion and used to scrape off the coherent mass on the out wall of the pipe and prevent the small tools dropping