Evaluation of thermal stimulation in hydrate reservoirs under hot-water cyclic injection

Gao, Yanfang; Chen, Mian

doi:10.1007/s12517-020-05384-w

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…127,128,141 Later, the operation parameters of hot water stimulation were analyzed and optimized, including the temperature of the injected water, injection rate, and injection cycling time through simulations. 130,131,145 It was previously mentioned that hot water injection would also provide great assistance for the hydraulic fracturing reservoir stimulation technique. 139 Unlike the study of thermal stimulation, inhibitor injection method was mostly studied via laboratory experiments for guidance of hydrate exploitation from the SCS.…”

Section: Advances On Natural Gas Hydratementioning

confidence: 99%

“…Therefore, the combination of depressurization method and thermal stimulation or inhibitor injection can accelerate the hydrate dissociation rate and increase the gas recovery of hydrate reservoirs, especially for long-term production . The simulation and experiment conducted by Feng et al based on the hydrate reservoir data and sediments from the SCS indicated that the higher injection rate of warm brine can improve the gas production rates, but the lower injection rate was more preferable from the aspect of energy ratio while using depressurization. ,, Later, the operation parameters of hot water stimulation were analyzed and optimized, including the temperature of the injected water, injection rate, and injection cycling time through simulations. ,, It was previously mentioned that hot water injection would also provide great assistance for the hydraulic fracturing reservoir stimulation technique …”

Section: Advances On Natural Gas Hydrate Exploitation In the Scsmentioning

confidence: 99%

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Recent Advances on Natural Gas Hydrate Exploration and Development in the South China Sea

Jian-wu

2021

Energy Fuels

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Because of the urgency of energy transition for a net-zero society, the world’s gas demand is rapidly increasing. Natural gas hydrate (NGH) is regarded as the next alternate energy resource to meet the demand, thanks to its high energy density and enormous reserves. As two successful production trials and a series of relevant drilling expeditions were implemented in the northern slope of the South China Sea (SCS), it may now be the most promising district for NGH exploitation in the world. The objective of this work is to review the recent research advances on hydrate exploration status, reservoir geological features, hydrate-bearing sediment geophysical properties, and hydrate exploitation techniques related to the hydrate reservoirs in the SCS. Geological surveys, well logging and core sampling were performed and helped the analysis of hydrate occurrence, gas origin, and accumulation mechanism. It is inferred that both microgenic and thermogenic gas present in SCS hydrate reservoirs and the hydrate accumulation is primarily controlled by the structure of the gas chimney. The characteristics of high porosity, low permeability, weak diagenesis, weak strength, and complex hydrate dissociation behaviors of the gas hydrate-bearing sediments from the SCS determined that innovative exploitation approaches are required. Different well configurations and reservoir stimulation techniques were proposed to enhance the production efficiency and evaluated through simulation and laboratory experiments. As the NGH development process in the SCS progresses continuously, it attracts more and more research interests from academic and engineering communities. We are convinced that, with constant diligence and effort, China will achieve the goal of safe and efficient commercial exploitation in the near future.

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Section: Advances On Natural Gas Hydratementioning

confidence: 99%

Section: Advances On Natural Gas Hydrate Exploitation In the Scsmentioning

confidence: 99%

Recent Advances on Natural Gas Hydrate Exploration and Development in the South China Sea

Jian-wu

2021

Energy Fuels

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“…Gas production from natural gas hydrate reservoirs can be initialized by changing the reservoir condition outside of the hydrate stability zone; the production strategies include hydrate dissociation through thermal stimulation [3], depressurization [4][5][6], chemical potential shift [7][8], and the combinations thereof [9]. Among these, depressurization and thermal stimulation are the most known approaches to extract gas from natural hydrate zones [10].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the impact of threshold pressure gradient on gas production from hydrate deposits

Lü

Qin

et al. 2022

Fuel

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Influence of temperature-viscosity behaviors of Karamay oil sand bitumen on the geomechanics in the SAGD process

Gao

Chen

2021

J Petrol Explor Prod Technol

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Viscosity-temperature behavior is important for the thermal recovery of bitumen: firstly, it is a criterion for evaluating the evolution of mobility with temperature, which affects oil production; and secondly, it determines the role of bitumen in the geomechanics in oil sand reservoir. To quantitatively evaluate the effect of temperature on dynamic viscosity, some experimental and modeling investigations were conducted. The viscosity of Karamay oil sand bitumen over a temperature range of 20 ~ 350 °C was measured, and the viscosity-temperature behavior was simulated by a modified three-parameter model using the least square method. It was found that the viscosity of Karamay bitumen drops sharply with the temperature increase. The effect of bitumen viscosity on the geomechanics in the SAGD process was discussed in terms of reservoir deformation, fluid flow, and heat transfer behaviors. The reservoir deformation, fluid flow, and heat transfer behaviors at varying bitumen viscosity show significant differences in the drained, partially drained, and undrained geomechanical zones. The structure’s bulk modulus, effective stress, and volumetric strain in the drained zone are lower than those in the undrained zone; while the oil mobility and Peclet number show the opposite tendency. The changes in the structure’s bulk modulus, effective stress, volumetric strain, oil mobility, and Peclet number due to the phase change of bitumen increase with the increase of oil saturation. This study can provide the field engineers with guidance for the design of a proper oil recovery scheme before its implementation, and with a useful relation for the coupled thermal-flow-structure analyses.

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Evaluation of thermal stimulation in hydrate reservoirs under hot-water cyclic injection

Cited by 7 publications

References 34 publications

Recent Advances on Natural Gas Hydrate Exploration and Development in the South China Sea

Recent Advances on Natural Gas Hydrate Exploration and Development in the South China Sea

Investigation of the impact of threshold pressure gradient on gas production from hydrate deposits

Influence of temperature-viscosity behaviors of Karamay oil sand bitumen on the geomechanics in the SAGD process

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