دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a mathematical expression that defines the physical state of a homogeneous substance by relating volume to pressure and absolute temperature for a given mass of the material.

n: see vapour-liquid equilibrium ratio.

n: the pressure at which a liquid and its vapour are in equilibrium at a given temperature.

n: (ECD) the increase in bottomhole pressure expressed as an increase in pressure that occurs only when mud is being circulated. Because of friction in the annulus as the mud is pumped, bottomhole pressure is slightly, but significantly, higher than when the mud is not being pumped. ECD is calculated by dividing the annular pressure loss by 0.052, dividing that by true vertical depth, and adding the result to the mud weight Also called circulating density, mudweight equivalent

n: The effective drilling-fluid weight at any point in the annulus of the well bore during fluid circulation.ECD includes drilling-fluid density, cuttings in the annulus, and annular pressure loss.

the effective fluid density that the formation sees when the friction pressure on the fluids returning to surface is added to the fluid density.

n: the atomic or formula weight of an element, compound, or ion divided by its valence. Elements entering into combination always do so in quantities proportional to their equivalent weights.

n: The atomic weight or formula weight of an element, compound, or ion divided by its valence. Elements entering into combination always do so in quantities to their equivalent weights. Also known as combining weight.

the atomic or formula weight of a material.

corrosion acceleration by passage of a high velocity flow or impingement of solids. May remove the thin, protective oxide film that protects exposed metal surface.

n: (remaining on board)estimated material remaining on board a vessel after a discharge. Includes residue or sediment clingage, which builds up on the interior surfaces of the vessels cargo compartments.

emergency shut-down valve.

abbr: and husband (Lat. et vir, and man). Commonly used in oil and gas leases.