Recovery of Methane From Gas Hydrates in a Porous Medium by Injection of Carbon Dioxide

Gimaltdinov, I. K.; Stolpovskii, M. V.; Хасанов, М. К.

doi:10.1134/s0021894418010017

Cited by 11 publications

(3 citation statements)

References 8 publications

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“…Moreover, their microscopic replacement mechanism is still unclear. A large number of experimental results show that the replacement ratio and CH 4 recovery efficiency using this method are affected by factors such as CO 2 injection rate, , the flow direction of CO 2 , injection P – T of CO 2 , the ratio of mixed gas, , three-phase (i.e., hydrate, gas, and water phase) saturation in HBS, , P – T conditions of HBS, , pore size distribution in HBS, absolute permeability of HBS, hydrate morphology, the salinity of pore water, etc. What is more, these factors may also have many cross effects .…”

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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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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“…Problems ( 6)-( 8) with boundary, initial and on the moving boundaries of phase transitions conditions (2)-( 5) are closed. To solve it, the method of catching the front into a grid node is used [38,39]. When using the method of catching the front at the grid point, it is assumed that the boundary of the CO 2 hydrate formation moves along the coordinate grid by exactly one step in one step by time.…”

Section: Mathematical Modelmentioning

confidence: 99%

Mathematical Model of Decomposition of Methane Hydrate during the Injection of Liquid Carbon Dioxide into a Reservoir Saturated with Methane and Its Hydrate

et al. 2020

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The article describes a mathematical model of pumping of heated liquid carbon dioxide into a reservoir of finite extent, the pores of which in the initial state contain methane and methane gas hydrate. This model takes into account the existence in the reservoir of three characteristic regions. We call the first region “near”, the second “intermediate”, and the third “far”. According to the problem statement, the first region contains liquid CO2 and hydrate, the second region is saturated with methane and water, the third contains methane and hydrate. The main features of mathematical models that provide a consistent description of the considered processes are investigated. It was found that at sufficiently high injection pressures and low pressures at the right reservoir boundary, the boundary of carbon dioxide hydrate formation can come up with the boundary of methane gas hydrate decomposition. It is also shown that at sufficiently low values of pressure of injection of carbon dioxide and pressure at the right boundary of the reservoir, the pressure at the boundary of hydrate formation of carbon dioxide drops below the boiling pressure of carbon dioxide. In this case, for a consistent description of the considered processes, it is necessary to correct the mathematical model in order to take into account the boiling of carbon dioxide. Maps of possible solutions have been built, which show in what ranges of parameters one or another mathematical model is consistent.

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“…For example, when the stability of hydrate is damaged due to the pressure drop or temperature rise in the sediments, the hydrate will be decomposed into methane gas and water. There are four prevalent techniques to recover gas from hydrate deposits, such as depressurization [6,7], thermal stimulation [8,9], inhibitor injection [10], and CO 2 /N 2 replacement [11,12]. In general, the depressurization method, in which the gas recovery from hydrate deposits by lowering the pressure below that of the hydrate stability, is considered to be the most economic and simple method.…”

Section: Introductionmentioning

confidence: 99%

Increasing Gas Production of Continuous Freeze-Thaw Hydrate Deposits Based on Local Reservoir Reconstruction

Shen

Mao²,

Cui

et al. 2023

Geofluids

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The fracturing technology for increasing gas production based on hydrate reservoir reconstruction has been proven to have the application prospect of hydrate production. The main content of this work is to study the influence mechanism between multiple production wells after fracturing the reservoirs around horizontal wells. Simulation results indicated that the gas production rates and cumulative volume of released gas by using hydraulic fracturing were both higher than that by using the traditional depressurization method. The average gas-to-water ratio in this work has broken through the technical bottleneck of exploiting hydrate only by the traditional depressurization method. After the rock matrix around the horizontal well was fractured, the permeability of the reservoir in the fracturing area would be increased; thus, the propagation distance of pressure drop would be promoted. In addition, the penetration of the hydrate decomposition area between horizontal production wells was conducive to promoting the flow of decomposed gas and water to production wells. Besides, the hydraulic fracturing method to increase the permeability of the reservoir around the production well is very effective for the gas production of low-permeability natural hydrate deposits. The best distance between production wells was recommended to be 45~60 m, and it was recommended to provide appropriate heat in the area between the two wells to accelerate the decomposition of hydrate.

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Recovery of Methane From Gas Hydrates in a Porous Medium by Injection of Carbon Dioxide

Cited by 11 publications

References 8 publications

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

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

Mathematical Model of Decomposition of Methane Hydrate during the Injection of Liquid Carbon Dioxide into a Reservoir Saturated with Methane and Its Hydrate

Increasing Gas Production of Continuous Freeze-Thaw Hydrate Deposits Based on Local Reservoir Reconstruction

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