The progress of enhanced gas recovery (EGR) in shale gas reservoirs: A review of theory, experiments, and simulations

Omari, Athumani; Wang, Chao; Li, Yang; Xu, Xingguang

doi:10.1016/j.petrol.2022.110461

Cited by 30 publications

(23 citation statements)

References 89 publications

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“…Although in some countries, unconventional gas and oil are still considered acceptable alternatives to more polluting energy resources (i.e., coal), climate change is leading many decision-making actors to move away from fossil fuels. Nevertheless, there still exist some greener perspectives for unconventional fuels, and especially those based on enhanced gas recovery via high-pressure CO 2 injection, which would ensure natural gas supply at low environmental impact via long-term sequestration of CO 2 in a coalbed or kerogen. ,− …”

Section: Introductionmentioning

confidence: 99%

Replica Exchange Molecular Dynamics Simulation of Organic Matter Evolution: From Lignin to Overmature Type III Kerogen

et al. 2022

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Much more than any other form of carbon, kerogen undergoes considerable chemical and structural evolution during natural maturation. Some properties, such as gas adsorption and transport capacity, which are very important for key energy and environmental issues in the context of shale hydrocarbon recovery or CO2 sequestration, may therefore depend significantly on maturity. Here, we report on an extension of a recent work by Atmani et al. [Energy Fuels20203415371547] in which we use the replica exchange molecular dynamics method to investigate the natural evolution of a softwood lignin model up to a largely overmature state with H/C = 0.13. We discuss in details the production of a fluid during the process and the evolution of the kerogen texture, structure, and properties via a detailed analysis of nine kerogen models of increasing maturity. We show that the kerogen is composed of small aromatics, branched by aliphatic chains, and is mostly nonporous in its immature state. It becomes increasingly aromatic during evolution, up to creating a percolating ring network at the overmature stage, while progressively increasing in porosity. In the final state, the overmature kerogen is highly porous, and the results suggest the presence of mesopores, even though the latter could not be captured due to the limited size of the simulation cell. The series of type III kerogen models produced in this work, with maturity ranging from immature to overmature, can be used in future work to investigate gas adsorption and transport properties.

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Section: Introductionmentioning

confidence: 99%

Replica Exchange Molecular Dynamics Simulation of Organic Matter Evolution: From Lignin to Overmature Type III Kerogen

et al. 2022

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“…116,118 In the rest of this paragraph, we briefly review the use of kerogen models to address the important problem of enhanced gas recovery through the injection of CO 2 in gas shales. For a more detailed review, the reader is referred to the recent review paper by Omari et al 119 on theory, experiments, and simulations on such a technical aspect. In an attempt to mimic enhanced gas recovery, Lee et al 109 employed umbrella sampling to investigate the substitution of water by carbon dioxide to stimulate the extraction of shale gas.…”

Section: Fluid Thermodynamics and Transport In Kerogenmentioning

confidence: 99%

Development of Atomistic Kerogen Models and Their Applications for Gas Adsorption and Diffusion: A Mini-Review

et al. 2023

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With the emergence of shale gas, numerous atomic-scale models of kerogen have been proposed in the literature. These models, which attempt to capture the structure, chemistry, and porosity of kerogens of various types and maturities, are nowadays commonlyif not routinelyused to gain nanoscale insights into the thermodynamics and dynamics of complex and important processes such as hydrocarbon recovery and carbon sequestration. However, modeling such a complex, disordered, and heterogeneous material is a particularly challenging task. It implies that important underlying assumptions and simplifications, which can significantly affect the predicted properties, have to be made when constructing the kerogen models. In this mini review, we discuss the existing atomistic models of kerogen by categorizing them according to the different approaches and assumptions used during their construction. For each type of model, we also describe how the construction strategy can impact the prediction of certain properties. Important work on kerogen interactions with gas and oil, from both the point of view of equilibrium adsorption (including adsorption-induced deformation) and transport, are described. Possible improvements and upscaling strategiesto better account for kerogen in its geological environmentare also discussed.

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“…Ensuring the safe and secure storage of CO 2 underground for centuries has been a challenging problem for researchers. Extensive studies have been conducted on different aspects of CO 2 geological sequestration, including sequestration projects, capacity estimation, and leakage monitoring. − These include, among other things, leakage monitoring, capacity estimation, and storage projects. Geological sequestration still confronts several difficulties despite the substantial study that has been done on the topic.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Geological Storage: Trapping Mechanisms, Storage Sites, Projects, and Application of Machine Learning

Feng

et al. 2023

Energy Fuels

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A significant amount of carbon dioxide (CO2) is being released into the atmosphere as a result of the acceleration of industrialization and increased energy consumption, which are causing a rise in world temperatures. Despite the fact that nations all over the world have actively participated in CO2 storage projects, there is still not enough to moderate global temperatures. Therefore, there is an urgent need for the development of CO2 sequestration technologies. The main geological storage trapping mechanisms are discussed in this work along with an analysis of the major influencing variables. Additionally, the benefits and drawbacks of significant storage locations and current research hotspots are explored. Storage project development across the globe is outlined. The use of machine learning for CO2 sequestration is reviewed toward the end. This extensive review reveals that the main variables affecting CO2 capture capacity are hydrodynamic and geochemical. The sequestration capability of various storage sites is significantly influenced by the reservoir characteristics and implementation methodologies. The successful implementation of the storage project is determined by local policies and public support. The development of machine learning technologies makes storage projects safer and more dependable.

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The progress of enhanced gas recovery (EGR) in shale gas reservoirs: A review of theory, experiments, and simulations

Cited by 30 publications

References 89 publications

Replica Exchange Molecular Dynamics Simulation of Organic Matter Evolution: From Lignin to Overmature Type III Kerogen

Replica Exchange Molecular Dynamics Simulation of Organic Matter Evolution: From Lignin to Overmature Type III Kerogen

Development of Atomistic Kerogen Models and Their Applications for Gas Adsorption and Diffusion: A Mini-Review

Recent Advances in Geological Storage: Trapping Mechanisms, Storage Sites, Projects, and Application of Machine Learning

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