دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a measure of the time required for a flowing medium. such as a fluid. to change its angular displacement.

n: the rate at which mud is travelling in the annular space of a drilling well.

n: The linear velocity of a fluid passing through an annular space. The term critical annular velocity is often used to describe the flow rate or velocity at which entrained solids will be efficiently transported by the annular fluid. If the fluid velocity f

the velocity of fluids flowing in the annulus. Important in clean-up and displacement processes.

n: a transport of gas by displacement against the flow on a single pipeline, so that the gas is redelivered upstream of its point of receipt.

n: a special housing for the positive-displacement downhole mud motor, which is manufactured with a bend of 10 to 30 to facilitate directional drilling.

reaching bottom with the plug during a cementing operation or fluid displacement operation.

a channel in the cement, usually caused by poor displacement of drilling mud.

n: the geometric centre of the water plane at which a mobile off- shore drilling rig floats and about which a rig rotates when acted on by an external force without a change in displacement.

n: a compressor in which the flow of gas to be compressed is moved away from the centre rapidly, usually by a series of blades or turbines. It is a continuous-flow compressor with a low pressure ratio and is used to transmit gas through a pipeline. Gas passing through the compressor contacts a rotating impeller, from which it is discharged into a diffuser, where its velocity is slowed and its kinetic energy changed to static pressure. Centrifugal compressors are nonpositive-displacement machines, often arranged in series on a line to achieve multistage compression.

a flow area in the cement from inefficient cementing displacement of the drilling mud.