دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a device that reduces the pressure or volume of a fluid flowing in a line and maintains the pressure or volume at a specified level.

n: the vapor pressure of a liquid at 100�F (37.78�C, 3l10K) as detennined by ASTM D 323-58, Standard Method of Test for Vapor Pressure of Petroleum Products (Reid Method).

n: 1. the ratio of the weight of a given volume of a substance at a given temperature to the weight of an equal volume of a standard substance at the same temperature. For example, if 1 cubic inch of water at 39�F (3.9�C) weighs 1 unit and 1 cubic inch of another solid or liquid at 39�F weighs 0.95 unit. then the relative density of the substance is 0.95. In determin- ing the relative density of gases, the comparison is made with the standard of air or hydrogen. 2. the ratio of the mass of a given volume of a substance to the mass of a like volume of a standard substance, such as water or air.

n: the quotient of the absolute error divided by the true value of the measured quantity. This multiplied by 100 gives the relative error as a percentage.

n: the ratio of the amount of water vapor in the air to the amount it would contain if completely saturated at a given temperature and pressure. See absolute humidity.

n: a phraseology of humidity ,namely the ratio of absolute humidity and saturated absolute humidity under the same conditon

chemicals that attempt to change the permeability of a pore if another fluid tries to flow. A common approach in water control but with very mixed results.

n: see pressure relief valve.

n: refer topop valve

a valve in a pressurized system that is set to open and relieve pressure at a certain pressure level.

n: cement placed in a wellbore after the primary cementing has occurred. Remedial cementing is used to repair holes in the casing, fill voids left behind in casing after primary cementing, stop lost circulation, and so on. Compare primary cementing.

n: Cementing operations performed to repair primary-cementing problems or to treat conditions arising after the wellbore has been constructed. The two main categories of remedial Cementing include squeeze cementing and the placement of cement plugs.

repair cementing.