Link between endowments, economics and environment in conventional and unconventional gas reservoirs

Aguilera, Roberto F.; Ripple, Ronald D.; Aguilera, Roberto

doi:10.1016/j.fuel.2014.02.063

Cited by 59 publications

(12 citation statements)

References 38 publications

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“…The permeability of coal in relation to gases is a key parameter used to describe coal in the processes of fracturing CBM reservoirs in bituminous coal mines [25][26][27]. Laboratory measurements have shown that coal permeability decreases in an exponential manner as the effective stress increases [23,[28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Investigating Permeability of Coal Samples of Various Porosities under Stress Conditions

Kudasik

2019

Energies

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Among the numerous factors that have an impact on coal permeability, coal porosity is one of the main parameters. A change in the mechanical stress applied to coal results in a change of porosity. The main objective of the conducted research was to answer the following question: is a decline in coal permeability a direct effect of a decrease in coal porosity, and does mechanical stress result solely in a porosity change? A study of coal porosity under mechanical stress conditions was conducted using a uniquely constructed measurement stand. The coal samples used were briquettes prepared from a granular coal material (middle-rank coal of type B—meta bituminous, upper carboniferous formation) from the “Zofiówka” coal mine, in Poland. In order to describe coal permeability, the Klinkenberg equation was used, as it takes into consideration the slippage effect, typical of porous media characterized by low permeability. On the basis of the obtained results, it was established that the values of the Klinkenberg permeability coefficient decrease as the mechanical stress and the corresponding reduction in porosity become greater. As the briquette porosity increased, the Klinkenberg slippage effect: (i) disappeared in the case of nitrogen, (ii) and was minor for methane. The briquettes used were characterized by various porosities and showed that mechanical stress results mainly in a change in coal porosity, which, in turn, reduces coal permeability.

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Section: Introductionmentioning

confidence: 99%

Investigating Permeability of Coal Samples of Various Porosities under Stress Conditions

Kudasik

2019

Energies

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“…Hence, improving the permeability of coal reservoirs is a major challenge for the development of CBM. Currently, hydraulic fracturing (HF), which produces a larger number of fractures by injecting fracturing fluid at a high pressure, is commonly used for the development of CBM; however, certain drawbacks, such as water pollution, high water consumption, and water lock effect, restrict the large‐scale application in arid regions . Thus, a new technology is urgently needed that increases the permeability of coal reservoirs with low energy consumption, no pollution, and applicability under different geological conditions.…”

Section: Introductionmentioning

confidence: 99%

Study on the pore evolution law of anthracite coal under liquid nitrogen freeze‐thaw cycles based on infrared thermal imaging and nuclear magnetic resonance

Chu

Zhang

2019

Energy Science & Engineering

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The waterless fracturing method with liquid nitrogen (LN 2 ) as the fracturing fluid has been proposed and successfully applied in coalbed methane (CBM) production in recent years. The temperature of the coal reservoir sharply decreases, causing damage to the pore structure of the coal reservoir due to the ultralow temperature of LN 2 during fracturing. Thus, in this paper, infrared thermal imaging (ITI) and nuclear magnetic resonance (NMR) were used to measure the temperature distribution and pore evolution law of anthracite coal. The results demonstrate that the temperature of the coal sample after being frozen by LN 2 was far less than 0°C, which causes the internal water of the coal sample to freeze and turn into ice and produce a frost-heave force. In addition, the temperature of the coal samples was not fixed but fluctuated, which led to the formation of a temperature gradient and induced thermal stress. The T 2 spectra variation showed that LN 2 freeze-thaw cycles can promote the development of pores in coal samples and enhance the connectivity of pores. Some of the micropores gradually connect and expand to form a large number of mesopores and macropores under the influence of frost-heave force and thermal stress. The total porosity, residual porosity, and effective porosity increase with the number of LN 2 freeze-thaw cycles. The NMR imaging directly reflects the change characteristics of the internal pore structure before and after LN 2 freeze-thaw, which provide a new way to reveal the pore evolution law of anthracite. These results show that LN 2 freeze-thaw cycles can damage the pore structure of anthracite coal, and a large number of mesopores and macropores are formed to provide channels for CBM migration, which improves the efficiency of LN 2 fracturing. K E Y W O R D Sinfrared thermal imaging, liquid nitrogen freeze-thaw cycles, nuclear magnetic resonance, pore evolution law | 3345 CHU and ZHanG

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“…Such a transition will require promoting RES technologies, to ensure producers a cost-based payment above market prices, such as the feed-intariff in the power sector [2]. Meanwhile, the natural gas, as the cleanest fossil fuel with abundant and widely dispersed resources, is broadly envisaged as a transition fuel to renewable sources [3].…”

Section: Introductionmentioning

confidence: 99%

Integration of the Iberian Natural Gas Infrastructure into the European Energy Transition to Renewable Sources

Fernández

Sánchez

Bernat

2018

The 2nd International Research Conference on Sustainable Energy, Engineering, Materials and Environment

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The natural gas is broadly envisaged as a transition fuel in the energy decarbonisation. However, demand scenarios to 2050 differs largely depending on the share captured in the power generation and transport sectors. In such an uncertain context, an intertemporal spatial equilibrium model is implemented, to optimize the deployment of the future EU infrastructures over the period 2015-2050. The Iberian sub region is emphasized, so that the role of its regasification capacity and the interconnection with the rest of the EU is stated. As a result, additional investments on regasification plants are not required, provided that the EU- Iberian interconnection is properly expanded, in line with the planned project MIDCAT.

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Link between endowments, economics and environment in conventional and unconventional gas reservoirs

Cited by 59 publications

References 38 publications

Investigating Permeability of Coal Samples of Various Porosities under Stress Conditions

Investigating Permeability of Coal Samples of Various Porosities under Stress Conditions

Study on the pore evolution law of anthracite coal under liquid nitrogen freeze‐thaw cycles based on infrared thermal imaging and nuclear magnetic resonance

Integration of the Iberian Natural Gas Infrastructure into the European Energy Transition to Renewable Sources

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