دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the adhesion of a thin film of a gas or liquid to the surface of a solid. Liquid hydrocarbons are recovered from natural gas by passing the gas through activated charcoal, silica gel, or other solids, which extract the heavier hydrocarbons. Steam treatment of the solid removes the adsorbed hydrocarbons, which are then collected and re-condensed. The adsorption process is also used to remove water vapour from air or natural gas. Compare absorption.

n: A surface phenomenon exhibited by a solid (adsorbent) to hold or concentrate gases, liquids or dissolved substances(adsorptive) upon its surface, due to adhesion.

the attraction and holding of a layer of a chemical on the wall of a formation. Usually held by ionic charge or wetting preference.

n: the combining power of a base, or alkali, as measured by the number of equivalents of an acid with which it reacts to form a salt. Any solution that bas a pH greater than 7 is alkaline. See pH.

n: The combining power of a base measured by the maximum number of equivalents of an acid with which it can react to form a salt. In water analysis, it represents the carbonates, bicarbonates, hydroxides and occasionally the borates, silicates and phosphates

n: a powder consisting of alumina. silica, lime, and other substances that hardens when mixed with water. Extensively used in the oil industry to bond casing to the walls of the wellbore.

n: The efflorescent gelatinous material made by alumina, silicon earth, lime and mineral matter. Becomes hard after mixed with water. Usually used for cementing in oilfield.

typically the Portland, silicate, and/or pozzilin, etc., mixtures used to form a stone-like permanent seal between the pipe and the formation.

formation binding agents (calcite, clay, silica overgrowth, heavy oil, etc.) that hold the formation grains together.

n: a rock of precipitated silica whose crystalline structure is not easily discemible and that fractures conchoidally (like glass). Flint, jasper, and chat are forms of chert.

a hard, silicate sedimentary rock. Similar to flint, but with less ordered structure. A cryptocrystalline form of quartz.

n: I. a term used for particles smaller than \1156 millimetre (4 microns) in size, regardless of mineral composition. 2. a group of hydrous aluminum silicate minerals (clay minerals). 3. a sediment of fine clastics.

n: (1) A soft, variously colored earth, commonly hydrous silicates of alumina, formed by the decomposition of feldspar and other aluminum silicates. Clay minerals are essentially insoluble in water but disperse under hydration, grinding, or velocity effects.

a fine grain (<0.00015” or about 4 microns) – finely crystalline silica sheet minerals. Usually of silicate composition. In oil field terms, the most common clays are Smectite (montmorillinite),illite, kaolinite and chlorite. The characteristic for autho

n: a substance able to remove water from another substance with which it is in contact. It may be liquid (e.g., triethylene glycol) or solid (e.g., silica gel).

n: an earthy deposit made up of the siliceous cell walls of onecelled marine algae called diatoms. It is used as an admixture for cement to produce a lowdensity slurry.

silica particles from Diatom beds. Used as a filtering media and as an additive to cement.

n: One of component of cement. It can increase the intensity of cement gradually in a long time.