دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: See casing sub.

a chlorine atom substituted onto an alkane (hydrocarbon chain). These materials have been identified as refinery catalyst poisons.

n: refer to drill collar lift nipple

n: a degignation given to any type of mud where high performing additives e.g.,cmc, have been partially or wholly substituted for commercial or natural clays. For comparable viscosity and densities (weighted with barite),a low-solids mud will have a lower v

n: a pin shaped like a carpenters nail and placed in a pressure relief valve. When the pin shears, it opens the valve to relieve pressure inside a vessel. Even though the nail pin is shaped like a nail, a carpenters nail should never be substituted for a nail pin. See also shear pin.

abbr: naturally occurring radioactive materials.

a naturally occurring radioactive scale. Usually Barium Sulfate scale with Uranium or Radium atoms substituted into the lattice structure. Can be detected downhole with a gamma ray log.

n: cement slurry that the oil or diesel containes some crude oil substitutes for the water.

generally salt and/or surfactant materials designed to simulate the effect of potassium chloride in preventing clay swelling. Substitutes may work in the wellbore but generally fail in the formation where severe swelling conditions exist.

n: it substitutes for reeling wire or chain to make up, two kinds for hydraulic and aerodynamic.

n: a hydraulically powered device used in lieu of a rotary to turn the drill pipe, tubing, or casing in a well.

n: a kinds of hydraulic driving device, it substitutes for the rotating table wheels pipe, oil tube or casing.