Investigation into optimization condition of thermal stimulation for hydrate dissociation in the sandy reservoir

Feng, Jing-Chun; Wang, Yi; Li, Xiao-Sen; Chen, Zhaoyang; Li, Gang; Zhang, Yu

doi:10.1016/j.apenergy.2015.05.106

Cited by 94 publications

(37 citation statements)

References 45 publications

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“…During the injection process, the pressures in the reactor were kept as constant (4.70 MPa) until the end of the dissociation experiments. The detailed information of hydrate formation and dissociation also has been introduced in the previous studies [20,27,31,41].…”

Section: Experimental Apparatusmentioning

confidence: 98%

“…After sands filling, both the porosity of the CHS and PHS are 48%. Then, the precalculated amount of deionized water and pure methane gas were injected into the two reactors, making the pressures in the reactors increase to approximately 20 MPa [31,41]. All the outlets were kept closed afterwards.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…From the perspectives of high energy ratio, high production efficiency, and the avoidance of ice blockage and hydrate re-formation, the combination of depressurization and thermal stimulation is regarded to be a profitable method for hydrate dissociation [27e29]. Due to the huge energy loss with the increase of water injection temperature, Feng et al [30] reported that high temperature (beyond 40 C) injection was not economic for hydrate dissociation, and they further indicated [31] that the optimal injected temperature for hydrate dissociation in a 5.83 L cubic hydrate simulator was 38e39 C by using the evaluation methods of entropy production minimization and energy ratio maximization. The hydrate dissociation behavior and the production performance of the hydrate reservoir are strongly affected by the scale of hydrate reservoir.…”

Section: Introductionmentioning

confidence: 98%

“…The method of entropy generation minimization which means the minimization of energy consumption, has been widely used in the optimal processes of the cogeneration plant [37], the distillation [38], the heat convection in porous media [39], the heat engines [40], and so on. Based on the minimum entropy generation theory, Feng et al [31] has obtained the optimal temperature range for hydrate dissociation in a 5.83 L reactor with the dual horizontal wells. However, there is lack of the evolution of the entropy generation with different scales of reservoir.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Energy and entropy analyses of hydrate dissociation in different scales of hydrate simulator

Feng

Wang

2016

Energy

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Section: Experimental Apparatusmentioning

confidence: 98%

Section: Experimental Apparatusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Energy and entropy analyses of hydrate dissociation in different scales of hydrate simulator

Feng

Wang

2016

Energy

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“…∆H h = 54.1 KJ/mol, which denotes the dissociation enthalpy of methane hydrate [25]. C g and C l are the specific heat of gas and water, respectively, m g and m l are the methane and water mass released from unit mass of hydrate, respectively.…”

Section: Energy Analysis Of the Ngh Production Process Under Ideal Comentioning

confidence: 99%

Gas-Lifting Characteristics of Methane-Water Mixture and Its Potential Application for Self-Eruption Production of Marine Natural Gas Hydrates

Zhang

Chen

et al. 2018

Energies

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A gas-lifting production method was firstly proposed to transport the methane-water mixture from natural gas hydrates deposits through marine vertical pipe in this work. Aiming at UBGH2-6 site, SH7 site and GMGS2-8 site, the gas-lifting performance of methane-water mixture in the vertical pipe was investigated by numerical calculation. The potential of Natural gas hydrates (NGH) self-eruption production induced by the gas-lifting process under ideal conditions was also studied based on the energy analysis. The calculation results indicate that the gas-lifting method has great advantage in avoiding the secondary hydrates formation in marine vertical pipe and reducing energy consumption. The gas-lifting process in the vertical pipe is testified to be spontaneous in UBGH2-6 site and SH7 site during the initial 4000 and 1000 days, respectively, which indicates the energy consumption for methane-water mixture transportation is saved. Sufficient heat supply for the hydrate dissociation is crucial for the NGH self-eruption production. Sensitivity analysis indicates that the water-gas ratio has more significant influences on gas-lifting performance in the vertical pipe compared to the flow rate. With the decrease of water-gas ratio, the bottomhole pressure decreases rapidly. Thus, the reduction of water production is effective to improve the gas-lifting performance.

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Hydrate Formation Characteristics during Carbon Dioxide Flow Through Depleted Methane Hydrate Deposits

et al. 2018

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Depleted methane hydrate (MH) reservoirs are potential sites for CO2 storage. Hydrate formation during the CO2 flow process in a dissociated MH sample was simulated to clarify the formation characteristics of CO2 hydrates and their effect on CO2 storage. Experiments included MH formation and dissociation, CO2 injection, water‐injection and CO2 hydrate dissociation, and liquid‐water distribution as monitored by magnetic resonance imaging (MRI). It was observed that the initial water saturation determined the hydrate saturation in the artificial sediment, and the depressurization range was the main factor influencing MH dissociation for the excess gas sample. Pressure is the key factor influencing hydrate formation during CO2 flow. An increase of the CO2 flow rate led to a decrease of both hydrate saturation and conversion of the injected CO2. The cumulative amount of injected water is not the key factor controlling CO2 hydrate formation, but it does determine the residual water saturation.

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Investigation into optimization condition of thermal stimulation for hydrate dissociation in the sandy reservoir

Cited by 94 publications

References 45 publications

Energy and entropy analyses of hydrate dissociation in different scales of hydrate simulator

Energy and entropy analyses of hydrate dissociation in different scales of hydrate simulator

Gas-Lifting Characteristics of Methane-Water Mixture and Its Potential Application for Self-Eruption Production of Marine Natural Gas Hydrates

Hydrate Formation Characteristics during Carbon Dioxide Flow Through Depleted Methane Hydrate Deposits

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