Energy-efficient natural gas hydrate production using gas exchange

Koh, Dong‐Yeun; Kang, Hyery; Lee, Jun Young; Park, Youngjune; Kim, Se-Joon; Lee, Jaehyoung; Lee, Joo Yong; Lee, Huen

doi:10.1016/j.apenergy.2015.10.082

Cited by 236 publications

(121 citation statements)

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“…The enormous amount of natural gas stored in the world's hydrates makes hydrate reservoirs one of the most abundant unconventional energy resources on Earth (Boswell & Collett, ; Collett, ; Koh et al, ; Milkov, ). In addition, methane is highly condensed in hydrate accumulations.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Methane Hydrate Formation in Geological Systems

You

Flemings

Malinverno

et al. 2019

Reviews of Geophysics

161

110

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Natural gas hydrate is ice‐like mixture of gas (mostly methane) and water that is widely found in sediments along the world's continental margins and within and beneath permafrost and glaciers in a near‐surface depth interval where the pressure is sufficiently high and temperature sufficiently low for gas hydrate to be stable. We categorize the myriad of geological gas hydrate deposits into five characteristic types. We then review the multiple quantitative models that have proposed to describe the genesis of these deposits and describe how each may have formed. We emphasize the importance of coupling multiphase flow (free gas and liquid water) and multicomponent reactive transport with geological history to describe the dynamical processes of gas hydrate formation and evolution in geological systems. A better insight into the kinetics of methane formation from microbial biogenesis and the processes of multiphase flow at the pore scale will advance our knowledge of how these systems form. By understanding the generation and evolution of gas hydrate through time, we will better decipher the role of gas hydrate in the carbon cycle, its potential to contribute to climate change and geohazards, and how to design optimal strategies for gas production from hydrate reservoirs.

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Section: Introductionmentioning

confidence: 99%

Mechanisms of Methane Hydrate Formation in Geological Systems

You

Flemings

Malinverno

et al. 2019

Reviews of Geophysics

161

110

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“…Although CO 2 replacement serves double duty as a method for energy source extraction and greenhouse gas sequestration, the contact between the injected CO 2 and CH 4 hydrate will be hindered by the released water and formation of CO 2 hydrates on the outside of CH 4 hydrates. 14 Meanwhile, migration will become clogged, causing a relatively low gas recovery rate, which has also been demonstrated by the CH 4 -CO 2 exchange test on the northern slope of Alaska. 15 Solid fluidization may destroy the seabed ecology and environment and increase the operation risk at the same time.…”

Section: Introductionmentioning

confidence: 91%

“…Furthermore, injecting inhibitors is not environmentally sound and may cause some pollution in the formation. Although CO 2 replacement serves double duty as a method for energy source extraction and greenhouse gas sequestration, the contact between the injected CO 2 and CH 4 hydrate will be hindered by the released water and formation of CO 2 hydrates on the outside of CH 4 hydrates . Meanwhile, migration will become clogged, causing a relatively low gas recovery rate, which has also been demonstrated by the CH 4 ‐CO 2 exchange test on the northern slope of Alaska .…”

Section: Introductionmentioning

confidence: 98%

“…Therefore, using this method to assist the gas production from GHBS by depressurization may present an exciting opportunity. The suggestion of creating artificial fractures in GHBS has been proposed for a long time, but there are certain controversial voices because fracturing the layers above or below the GHBS may give rise to potential gas seepages, uncontrolled dissociations, or blowouts . However, GHBS are usually buried in shallow deposits with unconsolidated and low‐stress characteristics, which are different from those of consolidated oil and gas reservoirs.…”

Section: Introductionmentioning

confidence: 99%

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Gas production from a silty hydrate reservoir in the South China Sea using hydraulic fracturing: A numerical simulation

Sun

Ning

Liu

et al. 2019

Energy Science & Engineering

119

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The low permeability of silty hydrate reservoirs in the South China Sea is a critical issue that threatens safe, efficient, and long‐term gas production from these reservoirs. Hydraulic fracturing is a potentially promising stimulation technology for such low‐permeability reservoirs. Here, we assess the gas production potential of a depressurization horizontal well that is assisted by the hydraulic fracturing using numerical simulation according to field data at site SH2 in this area. In addition, the number of horizontal wells drilled is discussed if commercial production is to be performed at this site. The results show that the production potential can be significantly stimulated at the early production stage by adopting hydraulic fracturing in this reservoir due to a better depressurization effect. However, the increase in gas recovery gradually decreases with the continuous dissociation of gas hydrates, and the evolution trend is similar to that in a reservoir without stimulation during later periods of gas production because the dissociation front gradually moves away from the fractures. From the perspective of production potential, using a horizontal well scheme assisted by the hydraulic fracturing technology for gas recovery from a hydrate deposit can sharply reduce the number of operation wells, shorten the drilling operation time, and boost the economic efficiency. The horizontal well scheme may be an effective way to increase the gas yield if the application of quickly deployed horizontal wells and hydraulic fracturing techniques in such hydrate reservoirs greatly increases in the near future.

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“…The depressurization technique has the advantage of lower energy consumption compared to other approaches (e.g. thermal stimulation and inhibitor injection), and the pressure reduction of a hydrate reservoir results in a large driving force of hydrate dissociation and CH 4 gas exploitation [8][9][10]. However, the hydrate dissociation of gas hydrate-bearing layers may raise serious concerns over sudden submarine repercussions such as sediment subsidence, slope failure, and ecosystem damage [11].…”

Section: Introductionmentioning

confidence: 98%