Modeling recovery of natural gas from hydrate reservoirs with carbon dioxide sequestration: Validation with Iġnik Sikumi field data

AbstractFundamental understanding of guest gas replacement in hydrate reservoirs is crucial for the enhanced recovery of natural gas and carbon dioxide (CO2) sequestration. To gain physical insight into this exchange process, this work aims at developing and validating a clathrate hydrate model for gas replacement. Most of the practical concerns associated with naturally occurring gas hydrates, including hydrate formation and dissociation in interstitial pore space between distributed sand particles in the presence of salt ions and in irregular nanometer-sized pores of those particles, irregularity in size of particles and shape of their pores, interphase dynamics during hydrate formation and decay, and effect of surface tension, are addressed. An online parameter identification technique is devised for automatic tuning of model parameters in the field. This model is employed to predict the laboratory-scale data for methane hydrate formation and decomposition. Subsequently, the model is validated with the field data of the Prudhoe Bay Unit on the Alaska North Slope during 2011 and 2012. In this Iġnik Sikumi field experiment, mixed CO2 (i.e., CO2 + N2) is used as a replacement agent for natural gas recovery. It is observed that the proposed formulation secures a promising performance with a maximum absolute average relative deviation (AARD) of about 2.83% for CH4, which is even lower, 0.84% for CO2 and 1.67% for N2.

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Numerical Simulation of Microscopic Formation of Carbon Dioxide Hydrate in Two-Phase Flow

10.1115/omae2021-62567 ◽

2021 ◽

Author(s):

Alan Junji Yamaguchi ◽

Kaito Kobayashi ◽

Toru Sato ◽

Takaomi Tobase

Keyword(s):

Carbon Dioxide ◽

Carbon Capture ◽

Two Phase Flow ◽

Pore Space ◽

Carbon Capture And Storage ◽

Hydrate Formation ◽

Field Method ◽

Phase Field Method ◽

Phase Flow ◽

Two Phase

Abstract The global warming is an important environmental concern and the carbon capture and storage (CCS) emerges as a very promising technology. Captured carbon dioxide (CO2) can be stored onshore or offshore in the aquifers. There is, however, a risk that stored CO2 will leak due to natural disasters. One possible solution to this is the natural formation of CO2 hydrates. Gas hydrate has an ice-like structure in which small gas molecules are trapped within cages of water molecules. Hydrate formation occurs under high pressure and low temperature conditions. Its stability under these conditions acts like a cap rock to prevent CO2 leaks. The main objective of this study is to understand how hydrate formation affects the permeability of leaked CO2 flows. The phase field method was used to simulate microscopic hydrate growth within the pore space of sand grains, while the lattice Boltzmann method was used to simulate two-phase flow. The results showed that the hydrate morphology within the pore space changes with the flow, and the permeability is significantly reduced as compared with the case without the flow.

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Methane Extraction from Natural Gas Hydrate Reservoirs with Simultaneous Storage of Carbon Dioxide

Chemie Ingenieur Technik ◽

10.1002/cite.201300164 ◽

2015 ◽

Vol 87 (4) ◽

pp. 475-483 ◽

Cited By ~ 5

Author(s):

Florian Stephan Merkel ◽

Heyko Jürgen Schultz

Keyword(s):

Carbon Dioxide ◽

Natural Gas ◽

Gas Hydrate ◽

Natural Gas Hydrate ◽

Methane Extraction ◽

Hydrate Reservoirs

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Hydrate Formation Conditions of Natural Gas with High Content of Carbon Dioxide and the Calculation Model

10.2118/131812-ms ◽

2010 ◽

Cited By ~ 1

Author(s):

Ruiyan Sun ◽

Changjun Li ◽

Sheng Yu ◽

Shigang Wang ◽

Ouyang Sun ◽

...

Keyword(s):

Carbon Dioxide ◽

Natural Gas ◽

Hydrate Formation ◽

Calculation Model ◽

Formation Conditions

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A review: Enhanced recovery of natural gas hydrate reservoirs

Chinese Journal of Chemical Engineering ◽

10.1016/j.cjche.2018.11.007 ◽

2019 ◽

Vol 27 (9) ◽

pp. 2062-2073 ◽

Cited By ~ 9

Author(s):

Fengguang Li ◽

Qing Yuan ◽

Tianduo Li ◽

Zhi Li ◽

Changyu Sun ◽

...

Keyword(s):

Natural Gas ◽

Gas Hydrate ◽

Enhanced Recovery ◽

Natural Gas Hydrate ◽

Hydrate Reservoirs

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The use of sodium chloride as strategy for improving CO2/CH4 replacement in natural gas hydrates promoted with depressurization methods

Arabian Journal of Geosciences ◽

10.1007/s12517-020-05879-6 ◽

2020 ◽

Vol 13 (18) ◽

Cited By ~ 1

Author(s):

Alberto Maria Gambelli ◽

Federico Rossi

Keyword(s):

Carbon Dioxide ◽

Sodium Chloride ◽

Natural Gas ◽

Gas Hydrates ◽

Hydrate Formation ◽

Free Water ◽

Process Efficiency ◽

Natural Gas Hydrates ◽

Replacement Process ◽

Permanent Storage

Abstract Natural gas hydrates represent a valid opportunity in terms of energy supplying, carbon dioxide permanent storage and climate change contrast. Research is more and more involved in performing CO2 replacement competitive strategies. In this context, the inhibitor effect of sodium chloride on hydrate formation and stability needs to be investigated in depth. The present work analyses how NaCl intervenes on CO2 hydrate formation, comparing results with the same typology of tests carried out with methane, in order to highlight the influence that salt produced on hydrate equilibrium conditions and possibilities which arise from here for improving the replacement process efficiency. Sodium chloride influence was then tested on five CO2/CH4 replacement tests, carried out via depressurization. In relation with the same typology of tests, realised in pure demineralised water and available elsewhere in literature, three main differences were found. Before the replacement phase, CH4 hydrate formation was particularly contained; moles of methane involved were in the range 0.059–0.103 mol. On the contrary, carbon dioxide moles entrapped into water cages were 0.085–0.206 mol or a significantly higher quantity. That may be justified by the greater presence of space and free water due to the lower CH4 hydrate formation, which led to a more massive new hydrate structure formation. Moreover, only a small part of methane moles remained entrapped into hydrates after the replacement phase (in the range of 0.023–0.042 mol), proving that, in presence of sodium chloride, CO2/CH4 exchange interested the greater part of hydrates. Thus, the possibility to conclude that sodium chloride presence during the CO2 replacement process provided positive and encouraging results in terms of methane recovery, carbon dioxide permanent storage and, consequently, replacement process efficiency.

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