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Corrosion Inhibitor Encapsulation For Enhanced Chemical Efficiency And Performance

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Corrosion of pipelines made of carbon steel and exposed to wet hydrocarbons containing CO2 and H2S is a common but serious problem encountered in petroleum industry and its occurrence causes enormousexpense due to production downtime, accidental injuries, and replacement costs. Control and prevent corrosion using chemical treatment (e.g. corrosion inhibitor injection) is one of the most cost-effective solutions and commonly practiced methods to prevent corrosion failures in pipelines in oil and gas industry. Generally speaking, the active corrosion inhibitor (CI) components in commercial CI packages are usually organic, nitrogen-based surfactants such as amines, imidazoline and its derivatives. Due to the amphiphilic nature of surfactants, a good fraction of the injected CI will inevitably go into the oil phase through partitioning and to the oil/water interface.

Product Number: 51322-17548-SG
Author: Fang Cao, James Oxley, Yao Xiong, Satish Bodige, Dennis Schmatz
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings
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$20.00
$20.00

Liquid corrosion inhibitor (CI) package injection is one of the most cost-effective solutions and commonly applied methods to control internal corrosion and prevent corrosion failures of carbon steel pipelines in the oil and gas industry. However, due to the amphiphilic nature of CIs, a significant fraction of the injected CI is lost into the oil phase through partitioning, dramatically decreasing the efficiency of CIs due to lowered CI concentration in the water phase. To enhance CI efficiency, a novel CI encapsulation technology was developed to bypass the oil phase and deliver inhibitors directly to the water phase. 

In this study, commercial CI packages as well as custom CI blends were encapsulated with water soluble matrix materials into microsphere morphology via spray drying technique. The stability of the encapsulated CIs in crude oils as well as synthetic oil was evaluated via weight loss measurement and the payload of the encapsulated CIs was estimated via solubility study in polar solvents. Partitioning behavior of encapsulated CI in an oil/water two phase system was investigated using methyl orange CI residual measurement method. The corrosion inhibition performance of encapsulated CIs in sweet aqueous corrosion environment was evaluated and compared with conventional liquid CIs through electrochemical corrosion tests. Due to minimized CI loss in oil phase, encapsulated CIs demonstrated superior corrosion inhibition efficiency and performance to commercial liquid CIs in an oil/water two phase system.

Liquid corrosion inhibitor (CI) package injection is one of the most cost-effective solutions and commonly applied methods to control internal corrosion and prevent corrosion failures of carbon steel pipelines in the oil and gas industry. However, due to the amphiphilic nature of CIs, a significant fraction of the injected CI is lost into the oil phase through partitioning, dramatically decreasing the efficiency of CIs due to lowered CI concentration in the water phase. To enhance CI efficiency, a novel CI encapsulation technology was developed to bypass the oil phase and deliver inhibitors directly to the water phase. 

In this study, commercial CI packages as well as custom CI blends were encapsulated with water soluble matrix materials into microsphere morphology via spray drying technique. The stability of the encapsulated CIs in crude oils as well as synthetic oil was evaluated via weight loss measurement and the payload of the encapsulated CIs was estimated via solubility study in polar solvents. Partitioning behavior of encapsulated CI in an oil/water two phase system was investigated using methyl orange CI residual measurement method. The corrosion inhibition performance of encapsulated CIs in sweet aqueous corrosion environment was evaluated and compared with conventional liquid CIs through electrochemical corrosion tests. Due to minimized CI loss in oil phase, encapsulated CIs demonstrated superior corrosion inhibition efficiency and performance to commercial liquid CIs in an oil/water two phase system.

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Corrosion Inhibitor Surfactant Optimization: Part 1 – Inhibitor Efficiency
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Corrosion Inhibitor Surfactant Optimization: Part 1 - Inhibitor Efficiency Approach

Product Number: 51322-18043-SG
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Corrosion inhibitors provide a critical barrier to internal corrosion, presenting the most cost-effective form of mitigation and enabling operators to use carbon steel where it would otherwise be impractical. The correct selection and validation of inhibitors is essential to ensure successful field deployment, providing safe and reliable operation. However, the selection and optimization of a corrosion inhibitor for a particular field application is not trivial.  
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Product Number: 51322-18045-SG
Author: Richard C. Woollam, Joshua Owen, Yasmin Hayatgheib, Richard Barker
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In the first paper, a mixture design matrix of a homologous series of alkyldimethylbenzylammonium chlorides (BAC) was used to assess the performance and facilitate optimization of a mixed surfactant corrosion inhibitor system based on surface coverage and steady state inhibited corrosion rate.1 In this second paper, the approach is extended to include adsorption kinetic analysis, as demonstrated in Woollam and Betancourt for a first-order Langmuir kinetic model.2 
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Guidelines for Corrosion Inhibitor Selection for Oil and Gas Production

Product Number: 51317--8842-SG
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Recommended corrosion inhibitor (CI) testing methods and interpretation to assure proper execution of a test program. Associated guidance for CI test program definition testing and management to ensure and improve the integrity of carbon steels applications in our Industry.
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