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Title: Integration of triaxial testing and pore-scale visualization of methane hydrate bearing sediments

Abstract

Understanding mechanical interactions between hydrate and hosting sediments is critical for evaluating formation stability and associated environmental impacts of hydrate-bearing sediments during gas production. While core-scale studies of hydrate-bearing sediments are readily available and some explanations of observed results rely on pore-scale behavior of hydrate, actual pore-scale observations supporting the larger-scale phenomena are rarely available for hydrate-bearing sediments, especially with methane as guest molecules. The primary reasons for the scarcity include the challenge of developing tools for small-scale testing apparatus and pore-scale visualization capability. We present a testing assembly that combines pore-scale visualization and triaxial test capability of methane hydrate-bearing sediments. This testing assembly allows temperature regulation and independent control of four pressures: influent and effluent pore pressure, confining pressure, and axial pressure. Axial and lateral effective stresses can be applied independently to a 9.5 mm diameter and 19 mm long specimen while the pore pressure and temperature are controlled to maintain the stability of methane hydrate. The testing assembly also includes an X-ray transparent beryllium core holder so that 3D computed tomography scanning can be conducted during the triaxial loading. This testing assembly permits pore-scale exploration of hydrate-sediment interaction in addition to the traditional stress-strain relationship. Exemplary outcomes aremore » presented to demonstrate applications of the testing assembly on geomechanical property estimations of methane-hydrate bearing sediments.« less

Authors:
ORCiD logo; ORCiD logo; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1579389
Grant/Contract Number:  
89243318CFE000003; FE0023656
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Name: Review of Scientific Instruments Journal Volume: 90 Journal Issue: 12; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics
Country of Publication:
United States
Language:
English

Citation Formats

Seol, Yongkoo, Lei, Liang, Choi, Jeong-Hoon, Jarvis, Karl, and Hill, Daniel. Integration of triaxial testing and pore-scale visualization of methane hydrate bearing sediments. United States: N. p., 2019. Web. doi:10.1063/1.5125445.
Seol, Yongkoo, Lei, Liang, Choi, Jeong-Hoon, Jarvis, Karl, & Hill, Daniel. Integration of triaxial testing and pore-scale visualization of methane hydrate bearing sediments. United States. https://doi.org/10.1063/1.5125445
Seol, Yongkoo, Lei, Liang, Choi, Jeong-Hoon, Jarvis, Karl, and Hill, Daniel. Thu . "Integration of triaxial testing and pore-scale visualization of methane hydrate bearing sediments". United States. https://doi.org/10.1063/1.5125445.
@article{osti_1579389,
title = {Integration of triaxial testing and pore-scale visualization of methane hydrate bearing sediments},
author = {Seol, Yongkoo and Lei, Liang and Choi, Jeong-Hoon and Jarvis, Karl and Hill, Daniel},
abstractNote = {Understanding mechanical interactions between hydrate and hosting sediments is critical for evaluating formation stability and associated environmental impacts of hydrate-bearing sediments during gas production. While core-scale studies of hydrate-bearing sediments are readily available and some explanations of observed results rely on pore-scale behavior of hydrate, actual pore-scale observations supporting the larger-scale phenomena are rarely available for hydrate-bearing sediments, especially with methane as guest molecules. The primary reasons for the scarcity include the challenge of developing tools for small-scale testing apparatus and pore-scale visualization capability. We present a testing assembly that combines pore-scale visualization and triaxial test capability of methane hydrate-bearing sediments. This testing assembly allows temperature regulation and independent control of four pressures: influent and effluent pore pressure, confining pressure, and axial pressure. Axial and lateral effective stresses can be applied independently to a 9.5 mm diameter and 19 mm long specimen while the pore pressure and temperature are controlled to maintain the stability of methane hydrate. The testing assembly also includes an X-ray transparent beryllium core holder so that 3D computed tomography scanning can be conducted during the triaxial loading. This testing assembly permits pore-scale exploration of hydrate-sediment interaction in addition to the traditional stress-strain relationship. Exemplary outcomes are presented to demonstrate applications of the testing assembly on geomechanical property estimations of methane-hydrate bearing sediments.},
doi = {10.1063/1.5125445},
journal = {Review of Scientific Instruments},
number = 12,
volume = 90,
place = {United States},
year = {2019},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.5125445

Citation Metrics:
Cited by: 21 works
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