Effect of injected chemical density on hydrate blockage removal in vertical pipes: Use of MEG/MeOH mixture to remove hydrate blockage

Aminnaji, Morteza; Tohidi, Bahman; Burgass, Rhoderick William; Atilhan, Mert

doi:10.1016/j.jngse.2017.06.030

Cited by 34 publications

(10 citation statements)

References 6 publications

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“…When it comes to the operation of gas fields, hydrate formation occurs in the presence of thermodynamic inhibitors such as MEG or MeOH in the presence of salts, i.e., NaCl solutions. Morphology of hydrate formation in the presence of thermodynamic inhibitors has been studied generally on individual inhibitor systems. ,, There are practically no observations of methane hydrate formation in MEG/NaCl or MeOH/NaCl solutions. The objective of this study is to investigate the morphology of methane hydrate crystals in the presence of both thermodynamic inhibitors (MeOH or MEG) and salt.…”

Section: Introductionmentioning

confidence: 99%

Morphology Study on the Effect of Thermodynamic Inhibitors during Methane Hydrate Formation in the Presence of NaCl

Kim

Veluswamy

Seo

et al. 2018

Crystal Growth & Design

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In this study, we investigate the morphology of methane hydrate formation and growth in the presence of wellknown thermodynamic inhibitors, monoethylene glycol (MEG) and methanol (MeOH) in a quiescent system. Morphology changes observed during the growth of methane hydrate while employing 5 wt % MEG and MeOH solutions in the presence and absence of NaCl are presented. When 5 wt % of MEG or MeOH was present in an aqueous solution individually, hydrate grew predominantly within the bulk solution featuring a "ridge"-shaped formation above the interface. In the presence of 3.5 wt % NaCl, an enhanced inhibition was observed for methane hydrates formed from 5 wt % MEG solution with limited hydrate growth in the bulk solution and above the gas-liquid interface. In contrast, 5 wt % MeOH solution in the presence of 3.5 wt % NaCl resulted in an increased hydrate growth in bulk (compared to the system without NaCl) and on the reactor wall above the gas−liquid interface, implying a weak promotion rather than the inhibition. Further, the effect of subcooling (ΔT) on the morphology of methane hydrates in the presence of MeOH/NaCl and MEG/NaCl was examined.

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Section: Introductionmentioning

confidence: 99%

Morphology Study on the Effect of Thermodynamic Inhibitors during Methane Hydrate Formation in the Presence of NaCl

Kim

Veluswamy

Seo

et al. 2018

Crystal Growth & Design

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“…To achieve the elevation of an inhibitory effect of inhibitors, the mixture of multiple THIs comes into being. , However, sometimes harmful interactions exist among them to form cross-inhibition. In detail, alcohol inhibitors may restrain the solubility of salts, finally causing a “salting-out effect” and stopping the produced gas from migrating to the production well. , Furthermore, the dilution problem of inhibitors caused by decomposed water and initial free water in HBS also has been severe, resulting in the low use frequency in hydrate exploitation because of their characteristics of high dosage, high pollution, substantial capital, and cost of chemicals. , Indeed, one method encapsulates high-concentration THIs in microcarriers and releases them at a fixed point and quantitatively has been introduced to alleviate the problem of high pollution, but the feasibility of this method still to be further studied …”

Section: Methods Of Gas Recovery From Hbsmentioning

confidence: 99%

Recent Advances in Methods of Gas Recovery from Hydrate-Bearing Sediments: A Review

et al. 2022

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Safe, efficient, and economical gas recovery from hydrate-bearing sediments (HBS) is a severe issue that determines if natural gas hydrate (NGH), as an alternative energy in the future as fossil fuels approach depletion, is applied. Researchers worldwide are committed to developing a safe, efficient, and economical method of gas recovery from HBS. However, until now, most methods are still being validated and not have not been identified to exploit NGH commercially. Therefore, it is appropriate and significant to discuss researchers’ achievements to exploit NGH and summarize their potential benefits and challenges. This paper introduces nearly all the conventional and latest NGH exploitation methods and reviews field trials’ development characteristics. On the basis of laboratory experiments and field trials, key challenges restricting safe and efficient NGH development, and the existing research gaps reflecting these challenges, are also presented from the gas production, security, and economic aspects. The unfavorable situation mainly comprises the insufficient sensible heat, extremely low thermal conductivity, and ultralow permeability of HBS, lower gas production rate and its intense fluctuations, higher water-to-gas ratio (WGR), geological deformation, and subsidence of HBS attributed to excessive sand production, driving the consideration of some possible solutions. Given this, a new method for enhanced gas production from HBS based on the combination of depressurization (DP) and an in-situ heat generation method is proposed. Benefiting from multiple theoretical enhancement mechanisms such as replenishing energy to HBS with in-situ heat generation powders, cementing and strengthening the HBS skeleton, improving the gas permeability in HBS, decreasing the WGR based on blocking water, and removing gas characteristics of hydration products, this method could be expected to achieve promising long-term performance of gas production, which will be theoretically and practically significant to study commercial gas production.

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“…Once hydrate films adhere on pipeline walls, either chemical solvents or thermal inputs are generally required to dissociate hydrates from surfaces. 45,158 Lowering the hydrate-adhesion forces on solid surfaces is thus one plausible, and even rather ideal, anti-hydrate solution. 63 Theoretically, hydrate deposits can be automatically removed by hydrodynamic shear stresses in the pipeline system, given the sufficiently low hydrate adhesion strength.…”

Section: Anti-hydrate Adhesion Surfacesmentioning

confidence: 99%

Anti-gas hydrate surfaces: perspectives, progress and prospects

Wang

Xiao

et al. 2022

J. Mater. Chem. A

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Effect of injected chemical density on hydrate blockage removal in vertical pipes: Use of MEG/MeOH mixture to remove hydrate blockage

Cited by 34 publications

References 6 publications

Morphology Study on the Effect of Thermodynamic Inhibitors during Methane Hydrate Formation in the Presence of NaCl

Morphology Study on the Effect of Thermodynamic Inhibitors during Methane Hydrate Formation in the Presence of NaCl

Recent Advances in Methods of Gas Recovery from Hydrate-Bearing Sediments: A Review

Anti-gas hydrate surfaces: perspectives, progress and prospects

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