Asphaltene definition is - any of the components of a bitumen (such as asphalt) that are soluble in carbon disulfide but not in paraffin naphtha and that are held to constitute the solid dispersed particles of the bitumen and to consist chiefly of high-molecular-weight hydrocarbons.
Detecting the onset of asphaltene precipitation presents greater technical challenges than quantifying the amount initially presented in the oil. It is appropriate at this time to define the following terms: onset point, flocculation onset point, asphaltene onset pressure, stability of …
The objective of this study was to assess the effect of asphaltene precipitation, flocculation, and deposition in the well productivity and the economic impacts related to it. Different production practices were applied to define the most appropriate and efficient production strategy.
1937). Today, asphaltenes are defined as the heaviest components of petroleum fluids that. are insoluble in light n-alkanes such as n-pentane (nC 5) or n-heptane (nC 7) but soluble in. aromatics ...
ASI - Asphaltene Stability Index. Looking for abbreviations of ASI? It is Asphaltene Stability Index. Asphaltene Stability Index listed as ASI. ... Definition; ASI: Advertising Specialty Institute (promotional products industry Association) ASI: ATV (All Terrain Vehicle) Safety Institute: ASI:
Asphalte comprimé.,,Matériau de revêtement obtenu par compression, sous pilons chauffés, de poudre d'asphalte chaude`` (Ibid.). Asphalte coulé.,,Produit d'étanchéité obtenu en mélangeant à chaud, au moment de l'emploi, des produits riches en bitume et du mastic d'asphalte`` (Ibid.). Asphalte coulé sablé.
Based on some microstudy on aging of the asphalt binder, it is seen that there are two reasons for the decrease of molecular diffusion of aged asphalt: on the one hand, the molecular size of asphaltene, resin, and aromatic decreases; on the other hand, free volume space for saturate reduces.
The acoustic resonance technique (ART) was fast and less subjective, but it did not define the lower asphaltene boundary. The interpretation of the onset pressure from the near-infrared (NIR) light-scattering technique (LST) was subjective to a degree. However, the NIR response defined the upper and lower boundaries of the asphaltene envelope ...
Four different laboratory techniques were independently used to define the onset of the asphaltene precipitation envelope. These methods are: 1) gravimetric; 2) acoustic resonance; 3) light scattering; and 4) filtration. The gravimetric method was found to be precise, and …
Increases in asphaltene problems with water-production onset are generally observed, as is the decrease in problems with larger water cuts; the definition of "large" varies with field. The presence of other solids with water in the produced fluid can exacerbate the consequences of asphaltene precipitation, generating a greater mass of ...
Asphaltene is a molecular substance that is found in crude oil along with other petroleum constituents, such as paraffins, naphthenes, aromatics and resins. It consists of molecules of sulfur, carbon, nitrogen, hydrogen and oxygen, along with traces of vanadium and nickel. The carbon-to-hydrogen ratio (C:H ratio) in asphaltenes is close to 1:1 ...
The asphaltene content of BR is determined by adding HPLC-grade anhydrous n-heptane (>99%, Sigma Aldrich) and define X (mL.g −1) as the n-heptane ratio, showing the volume of n-heptane added to ...
Asphaltene precipitation is caused by a number of factors including changes in pressure, temperature, and composition. The two most prevalent causes of asphaltene precipitation in the reservoir are decreasing pressure and mixing of oil with injected solvent in improved oil recovery (IOR) processes.
asphaltenes. 1. n. [Enhanced Oil Recovery] Organic materials consisting of aromatic and naphthenic ring compounds containing nitrogen, sulfur and oxygen molecules. The asphaltene fraction of crude is defined as the organic part of the oil that is not soluble in straight-chain solvents such as pentane or heptane. Asphaltenes exist as a colloidal ...
asphaltène - Définitions Français : Retrouvez la définition de asphaltène... - synonymes, homonymes, difficultés, citations.
The definition of asphaltenes differs from the laboratory to the oil field. Fortunately the science of asphaltenes has evolved, enabling a new look at how asphaltenes affect a wide variety of oilfield concerns, such as reservoir plumbing, tar mat and heavy oil formation and surety of fluid flow in pipes. ... As asphaltene content increases from ...
Maltenes are the n-alkane (pentane or heptane)-soluble molecular components of asphalt, which is the residue remaining after petroleum refiners remove other useful derivatives such as gasoline and kerosene from crude oil. Asphaltene compounds are the other primary component of asphalt.
An asphaltene supersaturation plot, now called the de Boer plot, graphs the reservoir pressure minus the bubble point pressure on the y-axis, and the in situ crude density on the x-axis (Fig. 2.14). For a given crude and reservoir conditions, the figure allows the risk level of asphaltene precipitation during production to be quickly assessed.
The definition of asphaltenes differs from the laboratory to the oil field. Fortunately the science of asphaltenes has evolved, enabling a new look at ... asphaltene content increases from 0% to 40%, the oil's viscosity and density increase dramatically and its color changes from clear to dark brown.
An asphaltene inhibitor is a chemical used in the oil and gas industry to remove asphaltenes from crude oil. Asphaltenes are the impurities found in crude oil that if not removed can choke refining equipment. Heavy crude oil contains solid ashpaltene deposits during the …
attractive forces between asphaltene particles, which consequently rlocculate. The point at which the colloidal asphaltene particles begin to precipitate is called the onset of asphaltene flocculation. The present model is an initial attempt to analytically formulate two, among many others, experimentally-verified phenomena.
Definition Asphaltenes are present in most petroleum materials, and in all heavy oils and bitumens from oilsands. This material is defined by solubility: the components that dissolve in toluene and precipitate in n-alkane solvents are the asphaltenes. For analytical purposes, the concentration of …
What does asphaltene mean? (organic chemistry) Any of the dark organic constituents of crude oils and bitumen that are soluble in aromatic solvents...
asphaltene stability has long been controversial and a more unified view is gradually emerging (Goual et al., 2011). This chapter is based upon the author s experience in asphaltene research over the past decade. It focuses on asphaltene separation, characterization, structure, and role of resins. 2. Definition
As asphaltene is the most complex component in petroleum, in order to more deeply study the physicochemical properties and structural composition of asphaltene, various studies attempted numerous methods to divide asphaltene into a series of narrow fractions, and comparatively analyzed their physical and chemical composition.
Asphaltene is a component of crude oil that has been reported to cause severe problems during production and transportation of the oil from the reservoir. It is a solid component of the oil that has different structures and molecular makeup which makes it one of the most complex components of the oil. This research provides a detailed review of asphaltene properties, characteristics, and ...
In context|organic chemistry|lang=en terms the difference between asphaltene and maltene is that asphaltene is (organic chemistry) any of the dark organic constituents of crude oils and bitumen that are soluble in aromatic solvents but not in aliphatic ones; they are polycyclic aromatic compounds (composed of fused benzene rings) with aliphatic side chains while maltene is (organic chemistry ...
The definition of asphaltenes as compounds that are soluble in aromatics such as toluene and insoluble in light alkanes are referred to as laboratory asphaltenes by Joshi et al. Asphaltenes that precipitate in the field from a depressurization process are called field asphaltenes and contain different constituents. Laboratory and field precipitates contain combinations of asphaltenes …
Asphaltene definition, any of the constituents of a bitumen, as asphalt, that are insoluble in pentane, hexane, or naphthalene. See more.
Composition. Asphaltenes consist primarily of carbon, hydrogen, nitrogen, oxygen, and sulfur, as well as trace amounts of vanadium and nickel.The C:H ratio is approximately 1:1.2, depending on the asphaltene source. Asphaltenes are defined operationally as the n-heptane (C 7 H 16)-insoluble, toluene (C 6 H 5 CH 3)-soluble component of a carbonaceous material such as crude oil, bitumen, or coal.
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