دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: see multistage centrifugal pump.

multizone.

sodium chloride salt. Halite.

n: a crude oil that is characterised by a low API gravity and a low yield of lubricating oils and that has a low pour point and a low viscosity index (compared to paraffin-base oils). It is often called asphalt-base oil, because the residue from its distillation contains asphaltic materials but little or no paraffin wax.

n pI: (NESHAP) emissions standards set forth under CAA for airborne pollutants that are immediately hazardous to human health or that cause cancer, gene mutation, or reproductive harm.

n: (NIOSH) an organisation established by the OSH Act within the Department of Health, Education and Welfare to develop and establish recommended occupational safety and health standards and to conduct research. The OSH Act requires NIOSH to publish an annual listing of all known toxic substances and the concentrations at which such toxicity is known to occur.

n: a highly compressible. highly expansible mixture of hydrocarbons with a low specific gravity and occurring naturally in a gaseous form. Besides hydrocarbon gases, natural gas may contain appreciable quantities of nitrogen. helium. carbon dioxide. hydrogen sulphide. and water vapour. Although gaseous at normal temperatures and pressures, the gases making up the mixture that is natural gas are variable in form and may be found either as gases or as liquids under suitable conditions of temperature and pressure.

n: A naturally occurring mixture of hydrocarbon gases that is highly compressible and expansible. Methane [CH4] is the chief constituent of most natural gas (constituting as much as 85% of some natural gases),with lesser amounts of ethane [C2H6], propane [C

methane, CH4;plus some short chain hydrocarbons (ethane, propane, butane) that may be in gasseous state at standard conditions.

n pi: (NORM) radioactive materials that occur naturally and that are brought to the surface during drilling operations or that contaminate drilling fluids, pipe scale, soil, or equipment. Although the EPA regulates NORM only in fertiliser (as of June 1992),it is likely that the regulation of other NORM material will follow in the near future. Currently, only Louisiana has state NORM regulations, but many other states are in the process of initiating regulations or have expressed an interest in doing so.

the amount of money received per barrel of oil equivalent produced after subtracting operating and administrative costs, and royalties.