MRI observation of CO2-C3H8 hydrate-induced water migration in glass sand

Zheng, Jia‐nan; Jiang, Lanlan; Wang, Pengfei; Zhou, Hang; Yang, Mingjun

doi:10.1016/j.ces.2019.07.038

Cited by 18 publications

(10 citation statements)

References 27 publications

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“…It should be noted that the changes in the deposit permeability by the water and hydrate phase decrease may also affect the depressurization process and gas/water production rate. 42,43 Figure 6 shows the real-time relationship among pressure, temperature, and hydrate decomposition during the production process of Case 2. It can be found that the injection of thermal water prohibited the p−T point of deposit, declining to the phase equilibrium line at first.…”

Section: Resultsmentioning

confidence: 99%

Production Behaviors of Water-Saturated Methane Hydrate Deposits during the Depressurization with/without Thermal Water Compensation Process

Zheng

Wang

et al. 2020

Energy Fuels

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Marine methane hydrate is an important source of energy for the future, attracting great attention of global researchers and many governments. The water-saturated hydrate deposit is more similar to the real environment of marine sediments. Yet, the production behaviors during the depressurization with/without thermal water compensation process are still unclear. In this study, the water-saturated hydrate deposits with initial conditions of 6 MPa, 3 °C, and 20% hydrate saturation are remolded. The basic decomposition method is simple depressurization to 2 MPa, and the compensation process proceeds by injecting a certain thermal water of different temperatures (20, 30, or 40 °C) into the inner deposit. The injected thermal is used for both the deposit temperature increase and the part hydrate decomposition. There are three stages of release, equilibrium, and free in the production process of water-saturated hydrate deposit by simple depressurization and another stage of compensation during the water injection. Irrelevant to the thermal compensation, the same amount of hydrates decompose in the most important equilibrium stage, in which the real-time pressure and temperature conditions change along the hydrate phase equilibrium line. Due to the effects of excess water on the depressurization rate and thermal supply, the effective temperature increase based on the phase equilibrium temperature is confirmed to be the deciding factor of decomposition rate of hydrates in the equilibrium stage. In addition, the gas/ water production of water-saturated hydrate deposit is jointly controlled by the water injection and hydrate decomposition. It is found that the decrease in water saturation is in favor of the gas production, and the gas saturation should be controlled over 25% by drawing water for a high gas production rate. The results of this study are significant to guide the spot production process of marine water-saturated hydrate deposits under depressurization or combined methods.

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Section: Resultsmentioning

confidence: 99%

Production Behaviors of Water-Saturated Methane Hydrate Deposits during the Depressurization with/without Thermal Water Compensation Process

Zheng

Wang

et al. 2020

Energy Fuels

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“…One type of porous media (BZ‐01 glass beads, As‐One Corporation) was used as uniform porous media, convenient for NMR scanning and hydrate formation. The glass beads have a particle diameter range of 0.105–0.125 mm with a 34.8% porosity . Deionized water with a conductivity of 18.2 MΩ cm was used in all experiments.…”

Section: Methodsmentioning

confidence: 99%

Quantitative analysis of CO₂ hydrate formation in porous media by proton NMR

Zheng

Yang

et al. 2019

AIChE Journal

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Gas hydrate is a nonstoichiometric crystal compound formed from water and gas. Most nonvisual studies on gas hydrate are unable to detect how much water is converted to hydrates, and thus, the hydrate stoichiometry calculations are inaccurate. This study investigated the CO 2 hydrate formation process in porous media directly and quantitatively. The characteristics of the time-variable consumption of hydrate formation indicated a two-stage formation, hydrate enclathration and continuous occupancy. The enclathration stage occurred in the first 20 min of the formation when considerable heat is released. The continuous occupancy stage lasted longer than the hydrate enclathration because the empty cages in previously formed hydrates would also be occupied. The higher formation pressures can accelerate water consumption and increase cage occupancy. The compositions of completely formed CO 2 hydrates at 2.7, 3.0, and 3.3 MPa and 275.15 K were determined as CO 2 Á6.90H 2 O, CO 2 Á6.70H 2 O, and CO 2 Á6.49H 2 O, respectively.

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“…32,33 Similar to the X-ray micro-CT imaging, MRI was previously used to study the behaviour of THF hydrates, [34][35][36] which then extended to other hydrate formers such as CO 2 (ref. 37) and CH 4 . 38 Several works have been performed so far using MRI to investigate formation and dissociation of methane hydrates in different size sand particles, 20 followed by attempts to characterise CO 2 /CH 4 exchange for integrated methane recovery and CO 2 storage purposes.…”

Section: Introductionmentioning

confidence: 97%

Effect of thermal formation/dissociation cycles on the kinetics of formation and pore-scale distribution of methane hydrates in porous media: a magnetic resonance imaging study

Farahani

Guo

Zhang

et al. 2021

Sustainable Energy Fuels

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MRI observation of CO2-C3H8 hydrate-induced water migration in glass sand

Cited by 18 publications

References 27 publications

Production Behaviors of Water-Saturated Methane Hydrate Deposits during the Depressurization with/without Thermal Water Compensation Process

Production Behaviors of Water-Saturated Methane Hydrate Deposits during the Depressurization with/without Thermal Water Compensation Process

Quantitative analysis of CO₂ hydrate formation in porous media by proton NMR

Effect of thermal formation/dissociation cycles on the kinetics of formation and pore-scale distribution of methane hydrates in porous media: a magnetic resonance imaging study

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MRI observation of CO2-C3H8 hydrate-induced water migration in glass sand

Cited by 18 publications

References 27 publications

Production Behaviors of Water-Saturated Methane Hydrate Deposits during the Depressurization with/without Thermal Water Compensation Process

Production Behaviors of Water-Saturated Methane Hydrate Deposits during the Depressurization with/without Thermal Water Compensation Process

Quantitative analysis of CO2 hydrate formation in porous media by proton NMR

Effect of thermal formation/dissociation cycles on the kinetics of formation and pore-scale distribution of methane hydrates in porous media: a magnetic resonance imaging study

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Quantitative analysis of CO₂ hydrate formation in porous media by proton NMR