دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

a rating of the opening in a screen (or in a filter less accurately). A micron is approximately 1/25400th of an inch.

n: heavy-duty paper perforated with several very small holes (pores). Folded in accordion pleats, micropore paper often serves as a secondary filter element in an engines fuel system. Fuel passes through the pores, while the unperforated part of the paper stops dirt. microresistivity log n: a resistivity logging tool consisting of a spring device and a pad. While the spring device holds the pad firmly against the borehole sidewall, electrodes in the pad measure resistivities in mud cake and nearby formation rock. See resistivity well logging.

n: one-thousandth of a volt.

n: (MSHA) a US government agency that evaluates research in the causes of occupational diseases and accidents. It is responsible for administration of the certification of respiratory safety equipment. Address: 4015 Wilson Blvd.;Arlington, VA 22203;(703) 235-1385.

n: 1. a naturally occurring inorganic crystalline element or compound with a definite chemical composition and characteristic physical properties such as crystal shape. melting point, colour. and hardness. Most minerals found in rocks are not pure. 2. broadly. a naturally occurring homogeneous substance that is obtained from the ground for human use (e.g.. stone. coal. salt, sulphur. sand. petroleum. water. natural gas).

a compound of generally known composition and structure involving naturally occurring silica-based formulations. Minerals are natural compounds formed by geologic processes.

n: a royalty payment amount to be made regardless of the rate of production. The excess of such payments over regular royalty is chargeable against future production, if any, accruing to the royalty interest.

n: a 1. physical combination of two or more elements or components that maintain their chemical identity;no chemical reaction is involved. 2. under OSHA, any combination of two or more chemicals if the combination is not, in whole or in part, the result of a chemical reaction.

abbr: millimetre.

multi-lateral.

mud line temperature