دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: See core bit.

n: a large valve, usually installed above the ram preventers, that forms a seal in the annular space between the pipe and the wellbore or, if no pipe is present, in the wellbore itself. Compare ram blowout preventet:

n: See annular blowout preventer.

a device installed above or below the BOP that is capable of sealing around any device, and even on itself if the wellbore is empty.

n: The percentage of cutting in the annular space carried by drilling fluid.

using the annulus as the flow path.

n: The cross-section area of annular space between drill column and borehole wall.

n: The pressure that drilling fluid overcomes friction when it flow in the annular space.

n: The phenomenon that nature gas enters into another formation or overflow the surface through circline cement mantle between casing and formation.