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Calcium Carbonate Scale Deposition And Inhibition: Effects Of Corrosion Inhibitors

Picture for Calcium Carbonate Scale Deposition And Inhibition: Effects Of Corrosion Inhibitors
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Product Number: 51321-16736-SG
Author: Qiwei Wang; Tawfiq Al-Shafai; Tao Chen; Sultan Alsubaie
Publication Date: 2021
$20.00
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Scale and corrosion inhibitors are often applied simultaneously in order to prevent inorganic deposition and protect system integrity of oilfield facilities. The compatibility between these chemicals is a major concern during chemical selection. Corrosion inhibitor compounds may form complex with scale inhibitor molecules and interfere with the interactions of scale inhibitor and scaling crystal, and consequently, affect the scale inhibitor performance. Understanding their interplay is of importance for the development of cost effective treatment programs.
In this work, the impacts of corrosion inhibitors on calcium carbonate deposition and inhibition were investigated. Experiments were carried out using the dynamic tube blocking method at 85oC and 350 psi. Three scale inhibitors tested were, respectively, based on tri-phosphonate, penta-phosphonate, and polyacrylate; whilst three corrosion inhibitors were blend products of different active ingredients. Results attained in this study suggested that at 50 ppm of corrosion inhibitor concentration, its impact on the scale inhibitor performance was minimal. Test data also showed that, in the absence of scale inhibitor, the influence of corrosion inhibitors on the kinetics of calcium carbonate scale deposition was insignificant under the test conditions.

Scale and corrosion inhibitors are often applied simultaneously in order to prevent inorganic deposition and protect system integrity of oilfield facilities. The compatibility between these chemicals is a major concern during chemical selection. Corrosion inhibitor compounds may form complex with scale inhibitor molecules and interfere with the interactions of scale inhibitor and scaling crystal, and consequently, affect the scale inhibitor performance. Understanding their interplay is of importance for the development of cost effective treatment programs.
In this work, the impacts of corrosion inhibitors on calcium carbonate deposition and inhibition were investigated. Experiments were carried out using the dynamic tube blocking method at 85oC and 350 psi. Three scale inhibitors tested were, respectively, based on tri-phosphonate, penta-phosphonate, and polyacrylate; whilst three corrosion inhibitors were blend products of different active ingredients. Results attained in this study suggested that at 50 ppm of corrosion inhibitor concentration, its impact on the scale inhibitor performance was minimal. Test data also showed that, in the absence of scale inhibitor, the influence of corrosion inhibitors on the kinetics of calcium carbonate scale deposition was insignificant under the test conditions.

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Evaluation Of Scale Deposition And Inhibition Using A Pilot-Scale Test System

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Author: Andrew Fyfe, David Nichols, Mark May, Neil Goodwin, Gordon Graham
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The formation of common inorganic scales (such as BaSO4, SrSO4, CaSO4 and CaCO3) in production tubing presents a significant problem in the oil and gas industry. The mixing of incompatible waters or changes in temperature, pressure, pH or hydrodynamics of a fluid may result in scale deposition, with the potential to cause constrictions in production tubing when allowed to build up. This can lead to costly interventions that result in delayed production and loss of revenue. Therefore, an effective scale mitigation strategy is a crucial part of field development and management.
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51318-11505-Evaluating the impact of different families of scale inhibitors on corrosion inhibitor performance

Product Number: 51318-11505-SG
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How different families of scale inhibitors impact corrosion inhibitors performance in the presence of each other. Fundamental properties of both chemistries and how their interaction can be understood at the molecular level.
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Development of Combined Corrosion and Scale Inhibitors

Product Number: 51319-12960-SG
Author: Pierre Mekarbane
Publication Date: 2019
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There is a growing demand for combined Corrosion Inhibitors (CI) and mineral Scale Inhibitors (SI) for the oil and gas production industry. The products are convenient when there is only one injection point for both additives of when logistics is an issue. Developing these type of products can sometimes be fastidious due to the potential incompatibility of cationic film forming corrosion inhibitors (like fatty amines) and anionic scale inhibitors (such as phosphonates or polymers). Thanks to 10 years of continuous research and developement a full range of combined CI and SI products was developed with specific properties to match the various field requirements. Special combined CI and SI were tailor made for field applications to have specific properties like: Thermal stability low emulsion tendency low viscosity for down-hole injection increased CI film persistency increased barium sulphate inhibition and compatibility of the neat chemical with carbon steel. Laboratory experiments were conducted to demonstrate each of the mentioned properties. In addition the positive feedback from years of industrial field application brings credit to the product performance.
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