Enhancement of gas production from natural gas hydrate reservoir by reservoir stimulation with the stratification split grouting foam mortar method

Natural gas hydrate in ocean bottom and permafrost is a great potential energy resource. Compared to fluids hydrocarbons (oil, water and gas) in conventional reservoir evaluation, natural gas hydrate exists in sedimentary formations in solid form, which should be reconsidered in its reservoir evaluation and global reserves assessment. Nuclear magnetic resonance (NMR) technique plays an important role in natural gas hydrate reservoir evaluation. The recent applications of NMR logging in natural gas hydrate reservoir evaluation including formation porosity-permeability estimation, gas hydrate saturation estimation and growth habits prediction in rock pores are introduced. Finally, the potential combination application of downhole NMR 1H relaxation and 13C spectroscopy in natural gas hydrate reservoir evaluation model is also discussed.

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Wellbore Flow Rules in Marine Natural Gas Hydrate Reservoir Drilling

Springer Series in Geomechanics and Geoengineering - Proceedings of the International Field Exploration and Development Conference 2017 ◽

10.1007/978-981-10-7560-5_151 ◽

2018 ◽

pp. 1658-1672

Author(s):

Na Wei ◽

Wantong Sun ◽

Yingfeng Meng ◽

Anqi Liu ◽

Guangling Chen ◽

...

Keyword(s):

Natural Gas ◽

Gas Hydrate ◽

Natural Gas Hydrate ◽

Hydrate Reservoir ◽

Gas Hydrate Reservoir ◽

Wellbore Flow

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Microcosmic retaining mechanism and behavior of screen media with highly argillaceous fine sand from natural gas hydrate reservoir

Journal of Natural Gas Science and Engineering ◽

10.1016/j.jngse.2020.103618 ◽

2020 ◽

Vol 83 ◽

pp. 103618

Author(s):

Changyin Dong ◽

Lizhi Wang ◽

Yugang Zhou ◽

Fansheng Huang ◽

Yang Song ◽

...

Keyword(s):

Natural Gas ◽

Gas Hydrate ◽

Fine Sand ◽

Natural Gas Hydrate ◽

Screen Media ◽

Hydrate Reservoir ◽

Gas Hydrate Reservoir ◽

And Behavior

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Creeping microstructure and fractal permeability model of natural gas hydrate reservoir

Marine and Petroleum Geology ◽

10.1016/j.marpetgeo.2020.104282 ◽

2020 ◽

Vol 115 ◽

pp. 104282 ◽

Cited By ~ 6

Author(s):

Jianchao Cai ◽

Yuxuan Xia ◽

Cheng Lu ◽

Hang Bian ◽

Shuangmei Zou

Keyword(s):

Natural Gas ◽

Gas Hydrate ◽

Natural Gas Hydrate ◽

Permeability Model ◽

Hydrate Reservoir ◽

Gas Hydrate Reservoir

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Importance of Gas Hydrates for India and Characterization of Methane Gas Dissociation in the Krishna-Godavari Basin Reservoir

Marine Technology Society Journal ◽

10.4031/mtsj.50.6.1 ◽

2016 ◽

Vol 50 (6) ◽

pp. 58-68 ◽

Cited By ~ 5

Author(s):

Narayanaswamy Vedachalam ◽

Sethuraman Ramesh ◽

Arunachalam Umapathy ◽

Gidugu Ananda Ramadass

Keyword(s):

Natural Gas ◽

Gas Hydrates ◽

Gas Hydrate ◽

Gas Production ◽

Hot Water ◽

Economic Resource ◽

Methane Gas ◽

Hydrate Reservoir ◽

Gas Hydrate Reservoir ◽

Godavari Basin

AbstractNatural gas hydrates are considered to be a strategic unconventional hydrocarbon resource in the Indian energy sector, and thermal stimulation is considered as one of the methods for producing methane from gas hydrate-bearing sediments. This paper discusses the importance of this abundantly available blue economic resource and analyzes the efficiency of methane gas production by circulating hot water in a horizontal well in the fine-grained, clay-rich natural gas hydrate reservoir in the Krishna-Godavari basin of India. Analysis is done using the electrothermal finite element analysis software MagNet-ThermNet and gas hydrate reservoir modeling software TOUGH+HYDRATE with reservoir petrophysical properties as inputs. Energy balance studies indicate that, in the 90% hydrate-saturated reservoir, the theoretical energy conversion ratio is 1:4.9, and for saturations below 20%, the ratio is <1. It is identified that a water flow of 0.2 m3/h at 270°C is required for every 1 m2 of wellhead surface area to dissociate gas hydrates up to a distance of 2.6 m from the well bore within 36 h.

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The Effects of the Length and Conductivity of Artificial Fracture on Gas Production from a Class 3 Hydrate Reservoir

Energies ◽

10.3390/en14227513 ◽

2021 ◽

Vol 14 (22) ◽

pp. 7513

Author(s):

Shilong Shang ◽

Lijuan Gu ◽

Hailong Lu

Keyword(s):

Natural Gas ◽

Gas Hydrate ◽

Energy Resource ◽

Gas Production ◽

Production Performance ◽

Natural Gas Hydrate ◽

Conductivity Method ◽

Fracture Length ◽

Hydrate Reservoir ◽

Artificial Fracture

Natural gas hydrate is considered as a potential energy resource. To develop technologies for the exploitation of natural gas hydrate, several field gas production tests have been carried out in permafrost and continental slope sediments. However, the gas production rates in these tests were still limited, and the low permeability of the hydrate-bearing sediments is identified as one of the crucial factors. Artificial fracturing is proposed to promote gas production rate by improving reservoir permeability. In this research, numerical studies about the effect of fracture length and fluid conductivity on production performance were carried out on an artificially fractured Class 3 hydrate reservoir (where the single hydrate zone is surrounded by an overlaying and underlying hydrate-free zone), in which the equivalent conductivity method was applied to depict the artificial fracture. The results show that artificial fracture can enhance gas production by offering an extra fluid flow channel for the migration of gas released from hydrate dissociation. The effect of fracture length on production is closely related to the time frame of production, and gas production improvement by enlarging the fracture length is observed after a certain production duration. Through the production process, secondary hydrate formation is absent in the fracture, and the high conductivity in the fracture is maintained. The results indicate that the increase in fracture conductivity has a limited effect on enhancing gas production.

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