Dual‐Purpose Kinetic Hydrate and Corrosion Inhibitors

ul-haq, Muhammad Imran

doi:10.1002/9783527835621.ch8

Cited by 4 publications

(5 citation statements)

References 123 publications

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“…The gas hydrate inhibition testing procedure in this study was based on the standard slow constant cooling (SCC) test developed by our research group. – The instrument used was the rocking equipment RC5 as supplied by PSL Systemtechnik (Germany). The RC5 was equipped with a temperature controller and pressure/temperature sensors.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, there has been increased activity to develop inhibitors that prevent two or more of the water-based production problems (hydrates, corrosion, and scale) in one treatment. – Chemicals that have multifunctional inhibition capabilities are more advantageous, especially in fields where these different production problems occur simultaneously. – In the development of multifunctional inhibitors, however, three important factors must be considered: effectiveness, compatibility, and cost. The performance of new inhibitors must be comparable or superior to that of existing commercial inhibitors.…”

Section: Introductionmentioning

confidence: 99%

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Synergistic Gas Hydrate and Corrosion Inhibition Using Maleic Anhydride: N-Isopropylmethacrylamide Copolymer and Small Thiols

Pomicpic,

Kelland

2023

ACS Omega

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Kinetic gas hydrate inhibitors (KHIs) are often used in combination with film-forming corrosion inhibitors (CIs) in oilfield production flow lines. However, CIs can be antagonistic to KHI performance. In this study, maleic anhydride-co-N-isopropylmethacrylamide copolymer (MA:NIPMAM) and its derivatives were successfully synthesized and tested for gas hydrate and corrosion inhibition. KHI slow constant cooling (1 °C/h) screening tests in high-pressure rocking cells with synthetic natural gas and CO2 corrosion bubble tests in brine were performed in this study. The results revealed that underivatized MA:NIPMAM in water (as maleic acid:NIPMAM copolymer) showed poor KHI performance, probably due to internal hydrogen bonding. However, derivatization of MA:NIPMAM with 3-(dibutylamino)-1-propylamine (DBAPA) to give MA:NIPMAM-DBAPA gave excellent gas hydrate inhibition performance but only weak corrosion inhibition performance. Unlike some KHI polymers, MA:NIPMAM-DBAPA was compatible with a classic fatty acid imidazoline CI, such that neither the KHI polymer performance nor the corrosion inhibition of the imidazoline was affected. Furthermore, excellent dual gas hydrate and corrosion inhibition was also achieved in blends of MA:NIPMAM-DBAPA with small thiol-based molecules. In particular, the addition of butyl thioglycolate not only gave excellent corrosion inhibition efficiency, better than adding the fatty imidazoline, but also enhanced the overall gas hydrate inhibition performance.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synergistic Gas Hydrate and Corrosion Inhibition Using Maleic Anhydride: N-Isopropylmethacrylamide Copolymer and Small Thiols

Pomicpic,

Kelland

2023

ACS Omega

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“…The processes of corrosion and gas hydrate formation in transportation oil and gas flowlines can be effectively controlled using inhibitors. However, the inhibition efficiency of the inhibitors adversely reduces during their coinjection into pipelines. − Therefore, designing a dual-function inhibitor to simultaneously prevent corrosion and gas hydrates can create an effective hybrid inhibition strategy. This dramatically reduces operating costs and overcomes the problem of inhibitor incompatibility. − Although biomolecules, ionic liquids, amino acids, and copolymers of vinyl caprolactam have been reported as dual-function inhibitors, , none of them showed a good inhibitory effect on the agglomeration of hydrate particles.…”

Section: Introductionmentioning

confidence: 99%

Environmentally Friendly Antiagglomerants: A Promising Solution for Gas Hydrate Plugging and Corrosion Risk Management in Oil and Gas Pipelines

Tang,

Chen,

Farhadian

et al. 2024

Energy Fuels

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Gas hydrates pose a serious flow assurance challenge due to their ability to form, agglomerate, and block subsea flowlines on relatively fast time scales, leading to the loss of production and potential safety and environmental risks. The hydrate management strategy based on antiagglomerant inhibitors has gained significant interest in recent years, particularly in long tiebacks, maturing fields, and deep-water projects. However, most of the antiagglomerants used are not environmentally friendly, and compatibility issues with corrosion inhibitors also arise during coinjection operations. Here, a new oleic acid derivative was synthesized and used to develop two formulations (OADs) as green multifunctional flow assurance chemicals to control hydrate agglomeration and corrosion risks inside oil and gas pipelines. The experimental results showed that the OADs effectively inhibited methane hydrate growth and formed a transportable hydrate slurry in a water−paraffin mixture. Moreover, 0.1 wt % OADs completely suppressed the corrosion process of carbon steel in a CO 2 -and H 2 S-saturated solution by a protection of 99.4%. Computational studies also revealed that the adsorption of OADs on the hydrate surface increased its hydrophobicity, preventing the hydrate and water droplets from aggregating or clumping together. Additionally, OADs decreased the binding energy of iron and corrosive species up to 99.5%, and corrosive ions were almost no longer in direct contact with iron. The binding energy between the inhibitor and iron indicated the formation of a stable protective film by the OAD molecules on the steel surface to protect it against acidic corrosion. These results contribute to show the potential of oleic acid as a valuable green source to develop dual-purpose antiagglomerant hydrate and corrosion inhibitors for hydrate-related safety management.

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“…Examples of SI–CIs include polyaspartates, and examples of KHI–SIs are polyaspartamides. Examples of KHI–CIs include N -vinyl lactam copolymers, N -alkylacrylamide copolymers, and polyurethanes. − The subject has been recently reviewed. A pioneering study by Sheng et al, and inspirational to our own studies, investigated the use of VCap copolymers as KHIs and CIs (Figure ).…”

Section: Introductionmentioning

confidence: 99%

Multi-functional Flow Assurance Chemicals: Corrosion and Kinetic Hydrate Inhibition from Maleic Anhydride:N-Vinyl Caprolactam Copolymers and Synergists

et al. 2023

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Water-based flow assurance issues include corrosion, scale, and gas hydrate formation. Chemical solutions to mitigate these issues usually require separate inhibitors, which sometimes can lead to compatibility difficulties. Herein, we report studies on maleic-based copolymers to combat hydrate and corrosion with a view to optimizing for scale inhibition also. The product of maleic anhydride:N-vinyl caprolactam copolymer reacted with 3-dibutylaminopropylamine (MA:VCap-DBAPA) and its amine oxide derivative (MA:VCap-DBAPA-AO) were the kinetic hydrate inhibitor (KHI) polymers investigated. Due to limited CO2 corrosion inhibition (CI) by the polymers alone, various oxygen-, sulfur-, and nitrogen-based additives were screened for improved CO2 CI and possible KHI synergy. KHI performance screening tests were conducted under high pressure with a structure II-forming natural gas mixture in steel rocking cells using the slow (1 °C/h) constant cooling method. CO2 corrosion inhibition was measured by linear polarization resistance in a stirred 1 L CO2 bubble test apparatus using C1018 steel coupons and 3.6 wt % brine at 20.5 °C. Several sulfur-based additives improved the CI efficiency of the maleic polymers, especially butyl thioglycolate and 2-aminoethanethiol, without a negative effect on the KHI performance. For example, 2500 ppm MA:VCap-DBAPA plus 1000 ppm butyl thioglycolate gave an average hydrate onset temperature (T o) of 4.4 °C (12.7 °C below the T o for no additive) and 99.7% CI efficiency. In contrast to a classic fatty acid imidazoline surfactant corrosion inhibitor, butyl thioglycolate was also found to greatly enhance the CI efficiency of industrial KHIs, poly(N-vinyl caprolactam) (PVCap) and N-vinyl pyrrolidone:N-vinyl caprolactam copolymer, with no antagonism to the KHI performance of the polymer. In addition, butyl thioglycolate boosted the KHI performance of PVCap. The use of small synergists such as butyl thioglycolate avoids the use of classical surfactant corrosion inhibitors which can lead to tighter emulsions and poor overboard oil-in-water quality.

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Dual‐Purpose Kinetic Hydrate and Corrosion Inhibitors

Cited by 4 publications

References 123 publications

Synergistic Gas Hydrate and Corrosion Inhibition Using Maleic Anhydride: N-Isopropylmethacrylamide Copolymer and Small Thiols

Synergistic Gas Hydrate and Corrosion Inhibition Using Maleic Anhydride: N-Isopropylmethacrylamide Copolymer and Small Thiols

Environmentally Friendly Antiagglomerants: A Promising Solution for Gas Hydrate Plugging and Corrosion Risk Management in Oil and Gas Pipelines

Multi-functional Flow Assurance Chemicals: Corrosion and Kinetic Hydrate Inhibition from Maleic Anhydride:N-Vinyl Caprolactam Copolymers and Synergists

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