Analyzing the applicability of in situ heating methods in the gas production from natural gas hydrate-bearing sediment with field scale numerical study

Li, Lijia; Li, Xiao-Sen; Wang, Yi; Luo, Yongjiang; Li, Bo

doi:10.1016/j.egyr.2020.11.208

Cited by 13 publications

(4 citation statements)

References 53 publications

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Section: Results and Discussionmentioning

confidence: 99%

“…Thermal conductivity can affect the transfer of heat in the HBS, which is an important index that determines the success of using thermal stimulation to exploit nature gas hydrates. 42 In this part, the effect of particle shapes on the thermal conductivities of HBS in the two different environments was investigated. The relevant parameter settings are as follows: the input temperature was 300 K; the output temperature was 275 K; the thermal conductivity of the particle was 2.6 W m −1 K −1 ; the thermal conductivity of water was 0.61 W m −1 K −1 ; and the thermal conductivities of methane hydrate and methane gas were 0.58 and 0.03 W m −1 K −1 , respectively.…”

Section: F Gs Js Kmentioning

confidence: 99%

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Study of the Physical Characteristics of a Pore-Filling Hydrate Reservoir: Particle Shape Effect

Yang

et al. 2021

Energy Fuels

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Methane gas hydrate (MGH) is an important clean energy source. In submarine continental margins, the main hydrate occurrence in the sediment is the pore-filling type, and there is a huge difference in the sediment particle shape. Thus, in this study, with a new algorithm based on X-ray computed tomography (CT), 16 three-dimensional models were reconstructed with different hydrate saturations and particle shapes. Pore network modeling (PNM) was used to characterize the pore space evolution, and the impacts of various hydrate saturations and particle shapes on the other physical properties were studied using PNM and the finite volume method (FVM). It is found that (1) when both the sediment particle size and the hydrate saturation are certain, the hydrate-bearing sediment (HBS) with rounder particles presents a smaller average radius of the pore and throat, (2) when hydrate saturation increases, the tortuosity appears as an upward trend and the HBS with irregular particles presents a faster increased rate, (3) when hydrate saturation becomes higher and higher, the permeability of HBS emerges as a downward trend and the HBS with rounder particles presents a lower permeability, (4) under the same hydrate saturation, the HBS with rounder particles presents a higher apparent thermal conductivity, and (5) the electrical conductivity of HBS will gradually decrease as hydrate saturation increases, and the HBS with rounder particles presents a lower electrical conductivity and a higher resistivity.

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Section: Results and Discussionmentioning

confidence: 99%

Section: F Gs Js Kmentioning

confidence: 99%

Study of the Physical Characteristics of a Pore-Filling Hydrate Reservoir: Particle Shape Effect

Yang

et al. 2021

Energy Fuels

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“…16 Unfortunately, the low thermal conductivity of the NGH reservoir has become a new challenge to application of these two methods economically. 17 In general, the depressurization is the most economical method for NGH production that without requiring additional energy input, both field scale numerical simulation and field trials have shown a commercial application prospect of this method. 18 In addition to taking the economic cost into consideration, the safety risk is also the key factor restricting NGH exploitation.…”

Section: Introductionmentioning

confidence: 99%

“…Then, the proposal suggests replacing the hot fluid injection methods with the electric heating in borehole bottom and CH 4 in situ oxidation . Unfortunately, the low thermal conductivity of the NGH reservoir has become a new challenge to application of these two methods economically . In general, the depressurization is the most economical method for NGH production that without requiring additional energy input, both field scale numerical simulation and field trials have shown a commercial application prospect of this method …”

Section: Introductionmentioning

confidence: 99%

Study on the Settlement Characteristics of Hydrate Bearing Sediment Caused by Gas Production with the Depressurization Method

Li,

Wang

et al. 2024

Energy Fuels

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The settlement of the reservoir caused by gas production from the hydrate reservoir is closely related to the safety of hydrate production. However, the settlement characteristics of a hydrate reservoir under a triaxial stress state are still unclear. In this study, the settlement characteristics of hydrate-bearing sediment (HBS) during the gas production process were experimentally investigated under a triaxial stress state. Additionally, numerical simulations were performed using the thermo-hydro-chemomechanical (THMC) fully coupled model for hydrate production implemented in COMSOL Multiphysics. Results show that the failure strength of the hydrate-bearing specimen increases significantly when hydrate saturation (S h ) is raised from 0 to 0.19 and 0.37 to 0.57, and only a slight change of failure strength is observed when S h is raised from 0.19 to 0.37. The secant modulus and cohesion are positively correlated with hydrate saturation, and the internal friction angle is negatively correlated with hydrate saturation. In the gas production process, the settlement of the specimens can be divided into three stages. The first stage is characterized by rapid settling caused by free gas discharge, which has the largest settlement amount. Then, a relatively gentle settling stage is caused by hydrate decomposition. In the final stage, with continuous gas production, the settlement of specimens remains constant. A specimen with lower S h or production pressure results in a greater settlement at the first stage. A larger settlement occurs at the second stage for a high S h specimen. The confining pressure has little effect on the HBS.

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Numerical simulation on gas production from inclined layered methane hydrate reservoirs in the Nankai Trough: A case study

et al. 2021

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Analyzing the applicability of in situ heating methods in the gas production from natural gas hydrate-bearing sediment with field scale numerical study

Cited by 13 publications

References 53 publications

Study of the Physical Characteristics of a Pore-Filling Hydrate Reservoir: Particle Shape Effect

Study of the Physical Characteristics of a Pore-Filling Hydrate Reservoir: Particle Shape Effect

Study on the Settlement Characteristics of Hydrate Bearing Sediment Caused by Gas Production with the Depressurization Method

Numerical simulation on gas production from inclined layered methane hydrate reservoirs in the Nankai Trough: A case study

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