Experimental evaluation of the gas recovery factor of methane hydrate in sandy sediment

Konno, Yoshihiro; Jin, Yusuke; Shinjou, Kazunori; Nagao, Jiro

doi:10.1039/c4ra08822k

Cited by 157 publications

(106 citation statements)

References 31 publications

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“…Konno et al use a large reservoir simulator, the Highpressure Giant Unit for Methane-hydrate Analyses to simulate field-like gas production behavior through laboratory experiments. They proved that more in-place methane could be produced when the production pressure was decreased to 2.1 MPa, which is below the quadruple point [21]. For the decomposition of hydrate using the depressurization process, the gas production rate is obviously restricted when there is no heat input due to the strong endothermic effect and small natural heat flux of the hydrate sediments [22].…”

Section: Introductionmentioning

confidence: 97%

Evaluation of gas production from methane hydrates using depressurization, thermal stimulation and combined methods

et al. 2015

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Section: Introductionmentioning

confidence: 97%

Evaluation of gas production from methane hydrates using depressurization, thermal stimulation and combined methods

et al. 2015

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“…The common methods for hydrate dissociation are: (1) the depressurization method, in which the hydrate reservoir pressure is reduced below the equilibrium decomposition pressure to decompose the hydrate [37,38]; (2) the thermal stimulation method, in which the hydrate reservoirs are heated above the equilibrium decomposition temperature to decompose the hydrate [21,39]; (3) the chemical injection method, in which chemicals (such as methanol or ethylene glycol) are injected into the reservoir to change the equilibrium hydrate decomposition conditions and induce hydrate dissociation [40,41]; and (4) the CO 2 replacement method, in which CO 2 is injected into the hydrate reservoirs to replace the methane gas [42,43]. A series of field production tests from the practical hydrate reservoirs have confirmed the availability of these methods, such as the test at the Mackenzie Delta (Northwest Territories, Canada) by thermal stimulation and depressurization methods [19], and the offshore test at the Nankai Trough, Japan by the depressurization method during 12-18 March 2013 [44]. Depressurization has been regarded as an effective method because of its economic and technical effectiveness [45].…”

Section: Methods Of Production and Well Designmentioning

confidence: 99%

“…In this work, the production pressure of the well is set as 4.5 MPa, which is the same as that in the field test of the Nankai Trough [44]. Figure 7 shows the evaluations of the cumulative volume of produced gas (Vp), cumulative volume of dissociated gas (VR), volumetric flow rate of produced gas (Qp), and volumetric flow rate of dissociated gas (QR) overtime.…”

Section: Production From Gmgs2-site 8 In the Pearl River Mouth Basin:mentioning

confidence: 99%

Evaluation of Gas Production from Marine Hydrate Deposits at the GMGS2-Site 8, Pearl River Mouth Basin, South China Sea

Wang

Feng

et al. 2016

Energies

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Natural gas hydrate accumulations were confirmed in the Dongsha Area of the South China Sea by the Guangzhou Marine Geological Survey 2 (GMGS2) scientific drilling expedition in 2013. The drilling sites of verified the existence of a hydrate-bearing layer. In this work gas production behavior was evaluated at GMGS2-8 by numerical simulation. The hydrate reservoir in the GMGS2-8 was characterized by dual hydrate layers and a massive hydrate layer. A single vertical well was considered as the well configuration, and depressurization was employed as the dissociation method. Analyses of gas production sensitivity to the production pressure, the thermal conductivity, and the intrinsic permeability were investigated as well. Simulation results indicated that the total gas production from the reference case is approximately 7.3ˆ10 7 ST m 3 in 30 years. The average gas production rate in 30 years is 6.7ˆ10 3 ST m 3 /day, which is much higher than the previous study in the Shenhu Area of the South China Sea performed by the GMGS-1. Moreover, the maximum gas production rate (9.5ˆ10 3 ST m 3 /day) has the same order of magnitude of the first offshore methane hydrate production test in the Nankai Trough. When production pressure decreases from 4.5 to 3.4 MPa, the volume of gas production increases by 20.5%, and when production pressure decreases from 3.4 to 2.3 MPa, the volume of gas production increases by 13.6%. Production behaviors are not sensitive to the thermal conductivity. In the initial 10 years, the higher permeability leads to a larger rate of gas production, however, the final volume of gas production in the case with the lowest permeability is the highest.

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“…The availability of methane in hydrates makes hydrates a key future energetic resource, whose exploitation represents a technical challenge. Studies that were conducted earlier by other researchers aimed in establishing efficient ways for exploration of gas hydrates [1][2][3][4] with a broad range of laboratory experiments [5][6][7][8][9][10][11][12][13][14] and field scale simulations [15][16][17][18]. However, the microscopic mechanism study of hydrate dissociation and its production process faces a great limitation with the available conventional methods.…”

Section: Introductionmentioning

confidence: 99%

Different Mechanism Effect between Gas-Solid and Liquid-Solid Interface on the Three-Phase Coexistence Hydrate System Dissociation in Seawater: A Molecular Dynamics Simulation Study

Sun

Wang

et al. 2017

Energies

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Almost 98% of methane hydrate is stored in the seawater environment, the study of microscopic mechanism for methane hydrate dissociation on the sea floor is of great significance to the development of hydrate production, involving a three-phase coexistence system of seawater (3.5% NaCl) + hydrate + methane gas. The molecular dynamics method is used to simulate the hydrate dissociation process. The dissociation of hydrate system depends on diffusion of methane molecules from partially open cages and a layer by layer breakdown of the closed cages. The presence of liquid or gas phases adjacent to the hydrate has an effect on the rate of hydrate dissociation. At the beginning of dissociation process, hydrate layers that are in contact with liquid phase dissociated faster than layers adjacent to the gas phase. As the dissociation continues, the thickness of water film near the hydrate-liquid interface became larger than the hydrate-gas interface giving more resistance to the hydrate dissociation. Dissociation rate of hydrate layers adjacent to gas phase gradually exceeds the dissociation rate of layers adjacent to the liquid phase. The difficulty of methane diffusion in the hydrate-liquid side also brings about change in dissociation rate.

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Experimental evaluation of the gas recovery factor of methane hydrate in sandy sediment

Abstract: Recovery factor of methane hydrate in sandy sediments can be enhanced using the sensible heat of the hydrate-bearing sediments and the latent heat of ice formation by applying deep depressurization.

Cited by 157 publications

References 31 publications

Evaluation of gas production from methane hydrates using depressurization, thermal stimulation and combined methods

Evaluation of gas production from methane hydrates using depressurization, thermal stimulation and combined methods

Evaluation of Gas Production from Marine Hydrate Deposits at the GMGS2-Site 8, Pearl River Mouth Basin, South China Sea

Different Mechanism Effect between Gas-Solid and Liquid-Solid Interface on the Three-Phase Coexistence Hydrate System Dissociation in Seawater: A Molecular Dynamics Simulation Study

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