Estimating CO2 degassing effect on CaCO3 precipitation under oil well conditions

Cosmo, Rafael de Paula; Pereira, Fábio de Assis Ressel; Ribeiro, Daniel da Cunha; Barros, Wagner Queiroz; Martins, André Leibsohn

doi:10.1016/j.petrol.2019.106207

Cited by 23 publications

(14 citation statements)

References 29 publications

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“…1,2 Calcium carbonate (CaCO 3 ) is the most common scale deposit considered as the major economic problem encountered. 3,4 Calcium carbonate possesses six different polymorphs: one amorphous CaCO 3 , two hydrated crystalline ones (hexahydrate and monohydrate CaCO 3 ), and three anhydrous crystalline polymorphs that are the rhombohedra calcite, the hexagonal vaterite, and the orthorhombic aragonite. 5−8 Calcite is the most stable polymorph under ambient atmospheric conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Iron Ions on the Crystal Growth Kinetics and Microstructure of Calcium Carbonate

Korchef

2019

Crystal Growth & Design

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In the present work, calcium carbonate was precipitated at 28 °C in the presence of iron ions using an accelerated scale method based on CO2 repelling from the solution. The polymorphism and morphology of the obtained precipitates were investigated using scanning electron microscopy, X-ray diffraction, and Fourier transform infrared analyses. At high solution supersaturations, iron ions did not have a significant effect on the inhibition of calcium carbonate crystallization. However, at relatively low solution supersaturations, iron ions addition retards the nucleation of calcium carbonate. Past the onset of nucleation, iron ions increased the CaCO3 growth rate, and most of calcium carbonate amounts precipitated in the bulk solution rather than on the cell walls, decreasing, therefore, risks of scaling. The inhibiting effectiveness of iron ions was explained by a three-step calcium carbonate formation mechanism involving calcium carbonate interaction with siderite.

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Section: Introductionmentioning

confidence: 99%

Effect of Iron Ions on the Crystal Growth Kinetics and Microstructure of Calcium Carbonate

Korchef

2019

Crystal Growth & Design

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“…Gypsum is the most difficult to dissolve and the most easily precipitated form of calcium sulfate below 40 • C [40,41]. Calcium carbonate also has three different forms, namely vaterite, aragonite, and calcite [30]. Among them, calcite belongs to the trigonal crystal system and is a thermodynamically stable phase.…”

Section: Calcium Sulfate and Calcium Carbonatementioning

confidence: 99%

“…Current scaling methods base their scaling trend predictions largely on the deposition mechanism of single scales [23,29], ignoring the influence of multi-ion interaction on the deposition process. Thus, there are some limitations and some errors in the prediction results [11,30,31]. It is therefore of great significance to study the mechanism of scale co-deposition in produced water for better formulation of scale control and scale prevention measures.…”

Section: Introductionmentioning

confidence: 99%

Co-Deposition Mechanisms of Calcium Sulfate and Calcium Carbonate Scale in Produced Water

Yan

Zhang

et al. 2021

Crystals

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Co-precipitation of mineral-based salts during scaling remains poorly understood and thermodynamically undefined within the water industry. This study focuses on investigating calcium carbonate and calcium sulfate mixed precipitation in scaling. Scaling is often observed in the produced water supply as a result of treatment processes. Co-precipitation results were compared with experimental results of a single salt crystallization. Several parameters were carefully monitored, including the electrical conductivity, pH value, crystal morphology and crystal form. The existence of the calcium carbonate scale in the mixed system encourages the loose calcium sulfate scale to become more tightly packed. The mixed scale was firmly adhered to the beaker, and the adhesion of the co-deposition product was located between the pure calcium sulfate scale and the pure calcium carbonate scale. The crystalline form of calcium sulfate was gypsum in both pure material deposition and mixed deposition, while the calcium carbonate scale was stable in calcite form in the pure material deposition. In the co-deposition, apart from calcite form, some calcium carbonate scale crystals had metastable vaterite form. This indicated that the presence of SO42− ions reduced the energy barrier of the calcium carbonate scale and hindered its transformation from a vaterite form to a calcite one, and the increase in HCO3− content inhibited the formation of calcium sulfate scale.

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“…However, these processes are generally of large-scale consumers of energy and confronted with various problems, such as corrosion and scale formation (Figure 1) which cause enormous energy losses. In most cases, scales are made of the sparingly soluble salt CaCO 3 [13][14][15][16][17][18][19]. Because of its poor thermal conductivity and its good adherence to the walls, CaCO 3 decreases the heat transfer rate, reduces the water flow rate, and even shortens equipment life by corrosion [20,21].…”

Section: Introductionmentioning

confidence: 99%

Effect of Operating Parameters and Foreign Ions on the Crystal Growth of Calcium Carbonate during Scale Formation: An Overview

Korchef¹

2022

Crystallization and Applications

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Due to the insufficiency of freshwater resources and to supply the drinking water populations, many desalination processes such as reverse osmosis, electrodialysis and distillation are widely used. However, these processes are of large-scale consumers of energy and confronted with various problems such as corrosion and scale formation. In most cases, scales are made of calcium carbonate CaCO3. In the present chapter, an overview on the effect of operating parameters such as temperature, pH and supersaturation on the precipitation kinetics, microstructure, and polymorphism of CaCO3 is given. Additionally, I put special emphasis on the effect of foreign ions such as magnesium, sulphate, and iron ions on CaCO3 precipitation since they are present at significant concentrations in natural waters. Also, the mechanisms by which these ions affect the crystal growth of CaCO3 were pointed out. Knowledge about these operating parameters as well as the effects of foreign ions allow elucidating the polymorphs growth during water treatment. The control of these operating parameters allows reducing scale formation during drinking water and wastewater treatment. The economic impact is of greatest importance since this favorably affects the treatment costs, increases the equipment life, and allows enhanced product water recovery.

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Estimating CO2 degassing effect on CaCO3 precipitation under oil well conditions

Cited by 23 publications

References 29 publications

Effect of Iron Ions on the Crystal Growth Kinetics and Microstructure of Calcium Carbonate

Effect of Iron Ions on the Crystal Growth Kinetics and Microstructure of Calcium Carbonate

Co-Deposition Mechanisms of Calcium Sulfate and Calcium Carbonate Scale in Produced Water

Effect of Operating Parameters and Foreign Ions on the Crystal Growth of Calcium Carbonate during Scale Formation: An Overview

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