Characterising thermally controlled CH<sub>4</sub>–CO<sub>2</sub> hydrate exchange in unconsolidated sediments

Stanwix, Paul L.; Rathnayake, Narmada M.; Obanos, Fernando Perez Perez De; Johns, Michael L.; Aman, Zachary M.; May, Eric F.

doi:10.1039/c8ee00139a

Cited by 80 publications

(37 citation statements)

References 37 publications

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“…[3][4][5][6][7] Nature has been storing methane gas in the form of natural gas hydrates for millions of years albeit in a slow manner, presenting itself today as a huge energy resource. [8][9][10] Gas hydrates are crystalline inclusion compounds where under suitable conditions cages made of water molecules may host guest gas molecules within. 11 Gas hydrates made of methane or natural gas are also known as combustible ice.…”

Section: Introductionmentioning

confidence: 99%

Ultra-rapid uptake and the highly stable storage of methane as combustible ice

Bhattacharjee

Goh

Arumuganainar

et al. 2020

Energy Environ. Sci.

144

114

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Section: Introductionmentioning

confidence: 99%

Ultra-rapid uptake and the highly stable storage of methane as combustible ice

Bhattacharjee

Goh

Arumuganainar

et al. 2020

Energy Environ. Sci.

144

114

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“…The replacement efficiency was studied in the CH 4 -CO 2 process utilizing liquid CO 2 and was proposed as a more suitable alternative than gaseous CO 2 [26][27][28][29], while similar approaches with CO 2 emulsions showed the most favorable efficiency despite the uncertainties in optimal CO 2 emulsion conditions [30]. Stanwix et al [31] reviewed pure CO 2 replacement experiments, reporting up to 50% CH 4 recovery. There are many hydrate-focused review studies which also provide excellent summaries of CH 4 -CO 2 replacement in hydrates [32][33][34][35][36][37][38][39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Enhanced CH4-CO2 Hydrate Swapping in the Presence of Low Dosage Methanol

et al. 2020

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CO2-rich gas injection into natural gas hydrate reservoirs is proposed as a carbon-neutral, novel technique to store CO2 while simultaneously producing CH4 gas from methane hydrate deposits without disturbing geological settings. This method is limited by the mass transport barrier created by hydrate film formation at the liquid–gas interface. The very low gas diffusivity through hydrate film formed at this interface causes low CO2 availability at the gas–hydrate interface, thus lowering the recovery and replacement efficiency during CH4-CO2 exchange. In a first-of-its-kind study, we have demonstrate the successful application of low dosage methanol to enhance gas storage and recovery and compare it with water and other surface-active kinetic promoters including SDS and L-methionine. Our study shows 40–80% CH4 recovery, 83–93% CO2 storage and 3–10% CH4-CO2 replacement efficiency in the presence of 5 wt% methanol, and further improvement in the swapping process due to a change in temperature from 1–4 °C is observed. We also discuss the influence of initial water saturation (30–66%), hydrate morphology (grain-coating and pore-filling) and hydrate surface area on the CH4-CO2 hydrate swapping. Very distinctive behavior in methane recovery caused by initial water saturation (above and below Swi = 0.35) and hydrate morphology is also discussed. Improved CO2 storage and methane recovery in the presence of methanol is attributed to its dual role as anti-agglomerate and thermodynamic driving force enhancer between CH4-CO2 hydrate phase boundaries when methanol is used at a low concentration (5 wt%). The findings of this study can be useful in exploring the usage of low dosage, bio-friendly, anti-agglomerate and hydrate inhibition compounds in improving CH4 recovery and storing CO2 in hydrate reservoirs without disturbing geological formation. To the best of the authors’ knowledge, this is the first experimental study to explore the novel application of an anti-agglomerate and hydrate inhibitor in low dosage to address the CO2 hydrate mass transfer barrier created at the gas–liquid interface to enhance CH4-CO2 hydrate exchange. Our study also highlights the importance of prior information about methane hydrate reservoirs, such as residual water saturation, degree of hydrate saturation and hydrate morphology, before applying the CH4-CO2 hydrate swapping technique.

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“…CO 2 -hydrocarbon interactions (i.e. competitive adsorption between CO 2 and CH 4 ) increase the available mass of free gas and the fluidity of native condensate oils (Liu and Wilcox 2011, Alvarado and Manrique 2010, Stanwix et al 2018. Field tests of CO 2 fracturing, performed both in China and North America, have achieved higher stimulated production than water-based fracturing (Asadi et al 2015, Siwei, He andQinghai 2019).…”

Section: Introductionmentioning

confidence: 99%

Review of fundamental studies of CO2 fracturing: Fracture propagation, propping and permeating

Hou

Sheng

Elsworth

et al. 2021

Journal of Petroleum Science and Engineering

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Characterising thermally controlled CH₄–CO₂ hydrate exchange in unconsolidated sediments

Abstract: Recovering methane (CH4) via the injection of carbon dioxide (CO2) into a CH4-hydrate-bearing reservoir is a highly attractive mechanism for meeting the world's future energy demand, since it offers the prospect of carbon-neutral energy production.

Cited by 80 publications

References 37 publications

Ultra-rapid uptake and the highly stable storage of methane as combustible ice

Ultra-rapid uptake and the highly stable storage of methane as combustible ice

Enhanced CH4-CO2 Hydrate Swapping in the Presence of Low Dosage Methanol

Review of fundamental studies of CO2 fracturing: Fracture propagation, propping and permeating

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Characterising thermally controlled CH4–CO2 hydrate exchange in unconsolidated sediments

Abstract: Recovering methane (CH4) via the injection of carbon dioxide (CO2) into a CH4-hydrate-bearing reservoir is a highly attractive mechanism for meeting the world's future energy demand, since it offers the prospect of carbon-neutral energy production.

Cited by 80 publications

References 37 publications

Ultra-rapid uptake and the highly stable storage of methane as combustible ice

Ultra-rapid uptake and the highly stable storage of methane as combustible ice

Enhanced CH4-CO2 Hydrate Swapping in the Presence of Low Dosage Methanol

Review of fundamental studies of CO2 fracturing: Fracture propagation, propping and permeating

Contact Info

Product

Resources

About

Characterising thermally controlled CH₄–CO₂ hydrate exchange in unconsolidated sediments