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Mechanisms And Polymorphic Transformation Of Calcium Carbonate Inorganic Scale In Oil-Water Emulsion.

Mechanisms And Polymorphic Transformation Of Calcium Carbonate Inorganic Scale In Oil-Water Emulsion
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The formation of mineral scale is an undesirable phenomenon which is as a result of the disturbances in thermodynamics and chemical equilibria of the water system. CaCO3 scale is one of the major flow challenges in the oil industry and the crystallization process starts from thermodynamically unstable hydrated form to anhydrous polymorphic stable forms1,2  The transformation involves a series of ordering, dehydration, and crystallization processes, each lowering the enthalpy of the system where the crystallization of the dehydrated amorphous material lowers the enthalpy the most. There are two theories regarding the polymorphic transformation of a solid structure. The first suggests the transformation occurs through a direct solid transition in which the metastable phase exhibits a rearrangement of its molecules or atoms to a more stable form3. The second is valid in the presence of a solvent which allows the dissolution and the re-nucleation and growth of the stable phase4. 

Product Number: 51322-17876-SG
Author: Olujide Sanni, Wassim Taleb, Richard Barker, Anne Neville, Ogbemi Bukuaghangin, Thibaut Charpentier, Frederick Pessu
Publication Date: 2022
Industry: Oil and Gas
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$20.00
$20.00

Studying the kinetics of scale formation on the surface and in the bulk of the fluid when the oil phase is present has not yet received much attention. The impact of adding an oil phase to both surface deposition and bulk precipitation is not clear and needs to be studied. This work studies the mechanisms and behavior of precipitation of calcium carbonate scale in the presence of oil - water emulsion. A total of 100ml of different oil fractions including cyclohexane, kerosene, toluene and asphaltene is introduced to a vessel with 1000ml of brine at temperature, T=30°C. Using the Rotating Cylinder Electrode (RCE) technique, the mixture is continuously stirred with an overhead impeller blade at 520 rpm to create homogeneous dispersion in the two-phase mixture.

Studying the kinetics of scale formation on the surface and in the bulk of the fluid when the oil phase is present has not yet received much attention. The impact of adding an oil phase to both surface deposition and bulk precipitation is not clear and needs to be studied. This work studies the mechanisms and behavior of precipitation of calcium carbonate scale in the presence of oil - water emulsion. A total of 100ml of different oil fractions including cyclohexane, kerosene, toluene and asphaltene is introduced to a vessel with 1000ml of brine at temperature, T=30°C. Using the Rotating Cylinder Electrode (RCE) technique, the mixture is continuously stirred with an overhead impeller blade at 520 rpm to create homogeneous dispersion in the two-phase mixture.

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