scholarly journals Simulation of Methane Recovery from Gas Hydrates Combined with Storing Carbon Dioxide as Hydrates

2011 ◽  
Vol 2011 ◽  
pp. 1-15 ◽  
Author(s):  
Georg Janicki ◽  
Stefan Schlüter ◽  
Torsten Hennig ◽  
Hildegard Lyko ◽  
Görge Deerberg
Keyword(s):  
Carbon Dioxide ◽  
Gas Hydrate ◽  
Flow Model ◽  
Medium Term ◽  
Methane Recovery ◽  
Hydrate Reservoir ◽  
Commercial Code ◽  
Rate Kinetics ◽  
Reservoir Simulator ◽  
Hydrate Reservoirs

In the medium term, gas hydrate reservoirs in the subsea sediment are intended as deposits for carbon dioxide (CO2) from fossil fuel consumption. This idea is supported by the thermodynamics of CO2 and methane (CH4) hydrates and the fact that CO2 hydrates are more stable than CH4 hydrates in a certain P-T range. The potential of producing methane by depressurization and/or by injecting CO2 is numerically studied in the frame of the SUGAR project. Simulations are performed with the commercial code STARS from CMG and the newly developed code HyReS (hydrate reservoir simulator) especially designed for hydrate processing in the subsea sediment. HyReS is a nonisothermal multiphase Darcy flow model combined with thermodynamics and rate kinetics suitable for gas hydrate calculations. Two scenarios are considered: the depressurization of an area 1,000 m in diameter and a one/two-well scenario with CO2 injection. Realistic rates for injection and production are estimated, and limitations of these processes are discussed.

Flue gas injection into gas hydrate reservoirs for methane recovery and carbon dioxide sequestration

2017 ◽  
Vol 136 ◽  
pp. 431-438 ◽  
Author(s):  
Jinhai Yang ◽  
Anthony Okwananke ◽  
Bahman Tohidi ◽  
Evgeny Chuvilin ◽  
Kirill Maerle ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Gas Hydrate ◽  
Flue Gas ◽  
Carbon Dioxide Sequestration ◽  
Gas Injection ◽  
Methane Recovery ◽  
Hydrate Reservoirs

An Early-Time Model for Drawdown Testing of a Hydrate-Capped Gas Reservoir

2009 ◽  
Vol 12 (04) ◽  
pp. 595-609 ◽  
Author(s):  
Shahab Gerami ◽  
Mehran Pooladi-Darvish
Keyword(s):  
Gas Hydrate ◽  
Gas Production ◽  
Production Performance ◽  
Gas Reservoir ◽  
Unconventional Gas ◽  
Free Gas ◽  
Hydrate Decomposition ◽  
Hydrate Reservoir ◽  
Wellbore Pressure ◽  
Hydrate Reservoirs

Summary Development of natural gas hydrates as an energy resource has gained significant interest during the past decade. Hydrate reservoirs may be found in different geologic settings including deep ocean sediments and arctic areas. Some reservoirs include a free-gas zone beneath the hydrate and such a situation is referred to as a hydrate-capped gas reservoir. Gas production from such a reservoir could result in pressure reduction in the hydrate cap and endothermic decomposition of hydrates. Well testing in conventional reservoirs is used for estimation of reservoir and near-wellbore properties. Drawdown testing in a hydrate-capped gas reservoir needs to account for the effect of gas from decomposing hydrates. This paper presents a 2D (r,z) mathematical model for a constant-rate drawdown test performed in a well completed in the free-gas zone of a hydrate-capped gas reservoir during the earlytime production. Using energy and material balance equations, the effect of endothermic hydrate decomposition appears as an increased compressibility in the resulting governing equation. The solution for the dimensionless wellbore pressure is derived using Laplace and finite Fourier cosine transforms. The solution to the analytical model was compared with a numerical hydrate reservoir simulator across some range of hydrate reservoir parameters. The use of this solution for determination of reservoir properties is demonstrated using a synthetic example. Furthermore, the solution may be used to quantify the contribution of hydrate decomposition on production performance. Introduction In recent years, demands for energy have stimulated the development of unconventional gas resources, which are available in enormous quantities around the world. Gas hydrate as an unconventional gas resource may be found in two geologic settings (Sloan 1991):on land in permafrost regions, andin the ocean sediments of continental margins. During the last decade, extensive efforts consisting of detection of the hydrate-bearing areas, drilling, logging, coring of the intervals, production pilot-testing, and mathematical modeling of hydrate reservoirs have been pursued to evaluate the potential of gas production from these gas-hydrate resources.

scholarly journals Simulation Study on Injection of CO2-Microemulsion for Methane Recovery From Gas-Hydrate Reservoirs

2006 ◽  
Author(s):  
Hemant Ashok Phale ◽  
Tao Zhu ◽  
Mark Daniel White ◽  
Bernard Peter McGrail
Keyword(s):  
Simulation Study ◽  
Gas Hydrate ◽  
Methane Recovery ◽  
Hydrate Reservoirs

Enhanced depressurisation for methane recovery from gas hydrate reservoirs by injection of compressed air and nitrogen

2018 ◽  
Vol 117 ◽  
pp. 138-146 ◽  
Author(s):  
Anthony Okwananke ◽  
Jinhai Yang ◽  
Bahman Tohidi ◽  
Evgeny Chuvilin ◽  
Vladimir Istomin ◽  
...  
Keyword(s):  
Gas Hydrate ◽  
Compressed Air ◽  
Methane Recovery ◽  
Hydrate Reservoirs

Development and application of gas hydrate reservoir simulator based on depressurizing mechanism

2000 ◽  
Vol 17 (3) ◽  
pp. 344-350 ◽  
Author(s):  
Won-Mo Sung ◽  
Dae-Gee Huh ◽  
Byong-Jae Ryu ◽  
Ho-Seob Lee
Keyword(s):  
Gas Hydrate ◽  
Hydrate Reservoir ◽  
Gas Hydrate Reservoir ◽  
Reservoir Simulator

The nucleation of gas hydrates near silica surfaces

2015 ◽  
Vol 93 (8) ◽  
pp. 791-798 ◽  
Author(s):  
Shuai Liang ◽  
Peter G. Kusalik
Keyword(s):  
Gas Hydrates ◽  
Gas Hydrate ◽  
Dynamics Simulation ◽  
Methane Hydrates ◽  
Mineral Surfaces ◽  
Methane Recovery ◽  
Nucleation Behavior ◽  
Silica Surfaces ◽  
Energy Penalty ◽  
Hydrate Reservoirs

Understanding the nucleation and crystal growth of gas hydrates near mineral surfaces and in confinement are critical to the methane recovery from gas hydrate reservoirs. In this work, through molecular dynamics simulation studies, we present an exploration of the nucleation behavior of methane hydrates near model hydroxylated silica surfaces. Our simulation results indicate that the nucleation of methane hydrates can initiate from the silica surfaces despite of the structural mismatch of the two solid phases. A layer of intermediate half-cage structures was observed between the gas hydrate and silica surfaces, apparently helping to minimize the free energy penalty. These results have important implications to our understanding of the effects of solid surfaces on hydrate nucleation processes.

scholarly journals Enhanced CH4-CO2 Hydrate Swapping in the Presence of Low Dosage Methanol

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5238 ◽  
Author(s):  
Jyoti Shanker Pandey ◽  
Charilaos Karantonidis ◽  
Adam Paul Karcz ◽  
Nicolas von Solms
Keyword(s):  
Gas Hydrate ◽  
Methane Hydrate ◽  
Water Saturation ◽  
Co2 Storage ◽  
Residual Water ◽  
Methane Recovery ◽  
Initial Water ◽  
Hydrate Film ◽  
Hydrate Reservoirs ◽  
Low Dosage

CO2-rich gas injection into natural gas hydrate reservoirs is proposed as a carbon-neutral, novel technique to store CO2 while simultaneously producing CH4 gas from methane hydrate deposits without disturbing geological settings. This method is limited by the mass transport barrier created by hydrate film formation at the liquid–gas interface. The very low gas diffusivity through hydrate film formed at this interface causes low CO2 availability at the gas–hydrate interface, thus lowering the recovery and replacement efficiency during CH4-CO2 exchange. In a first-of-its-kind study, we have demonstrate the successful application of low dosage methanol to enhance gas storage and recovery and compare it with water and other surface-active kinetic promoters including SDS and L-methionine. Our study shows 40–80% CH4 recovery, 83–93% CO2 storage and 3–10% CH4-CO2 replacement efficiency in the presence of 5 wt% methanol, and further improvement in the swapping process due to a change in temperature from 1–4 °C is observed. We also discuss the influence of initial water saturation (30–66%), hydrate morphology (grain-coating and pore-filling) and hydrate surface area on the CH4-CO2 hydrate swapping. Very distinctive behavior in methane recovery caused by initial water saturation (above and below Swi = 0.35) and hydrate morphology is also discussed. Improved CO2 storage and methane recovery in the presence of methanol is attributed to its dual role as anti-agglomerate and thermodynamic driving force enhancer between CH4-CO2 hydrate phase boundaries when methanol is used at a low concentration (5 wt%). The findings of this study can be useful in exploring the usage of low dosage, bio-friendly, anti-agglomerate and hydrate inhibition compounds in improving CH4 recovery and storing CO2 in hydrate reservoirs without disturbing geological formation. To the best of the authors’ knowledge, this is the first experimental study to explore the novel application of an anti-agglomerate and hydrate inhibitor in low dosage to address the CO2 hydrate mass transfer barrier created at the gas–liquid interface to enhance CH4-CO2 hydrate exchange. Our study also highlights the importance of prior information about methane hydrate reservoirs, such as residual water saturation, degree of hydrate saturation and hydrate morphology, before applying the CH4-CO2 hydrate swapping technique.

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