دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

the maximum stress allowed by code or other agreement or study as a fraction of test pressure. Design pressure of the system is related to hoop stress.

n: any distillation made in accordance with ASTM procedure. Generally refers to a distillation test to determine the initial boiling point, the temperature at which percentage fractionations of the sample are distilled, the final boiling point, and quantity of residue.

n pi: 1. the liquids and the residue that collect in the bottom of a vessel (such as tank bottoms) or that remain in the bottom of a storage tank after a period of service.2. the residual fractions remaining at the bottom of a fractionating tower after lighter components have been distilled off as vapours.

a low alloy steel, containing a mass fraction maximum of 2% carbon, 1.65% manganese and residual quantities of other materials. Common in pipe manufacture.

n: an interest in oil and gas properties that belongs, for example, to a working interest owner or unleased landowner who agrees to a joint operation without being willing to pay a share of the costs of the operation. An interest may be carried until the well pays out, at which point it may stop or may continue for the life of production. Stated another way, an agreement between two or more working interests whereby one party (the carried party) does not share in lease revenue until a certain amount of money has been recovered by the other party (the carrying party). The carrying party pays costs applicable to the carried partys interests in the property and is reimbursed out of the revenue applicable to the carried partys interest.

a fractional working interest in an oil and gas lease that arises from a deal between co-owners.

n: sodium hydroxide, NaOH. It is used to maintain an alkaline pH in drilling mud and in petroleum fractions.

n: See sodium hydroxide.

n: a light hydrocarbon liquid obtained by condensation of hydrocarbon vapours. It consists of varying proportions of butane, propane, pentane, and heavier fractions, with little or no methane or ethane.

the part of the hydrocarbon stream that is a vapor in the formation and condenses to a liquid after being cooled. Normally the volatile condensate has a composition of C5 to C8 and an API gravity of >40.

n: 1. portion or fraction of hydrocarbons that have been separated according to boiling point or gravity. 2. the line of demarcation on the measuring scale made by the material being measured.

the fraction of a fluid in a mixture of fluids.

n: a centrifugal device for removing very fine particles, or silt, from drilling fluid to keep the amount of solids in the fluid at the lowest possible point. Usually, the lower the solids content of mud, the faster is the rate of penetration. The desilter works on the same principle as a desander. Com- pare desander.

n: A hydrocyclone with an inside diameter less than 6 inches. It can remove a large fraction of solids larger than 15–20 microns.