New Insights from Supercritical Methane Adsorption in Coal: Gas Resource Estimation, Thermodynamics, and Engineering Application

Wang, Zhaofeng; Tang, Xu

doi:10.1021/acs.energyfuels.8b00477

Cited by 42 publications

(36 citation statements)

References 46 publications

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“…There are several well-known models used to quantitatively describe the sorption isotherms: Langmuir, Brunauer-Emmett-Teller (BET), Dubinin-Radushkevich (DR) and Dubinin-Astakhov (DA), respectively [15][16][17][18]. To effectively describe the gas adsorption behavior at low pressure the Langmuir model is recommended [19]. Unsaturated hydrocarbons have a double bond between carbon atoms that promotes their reactivity, so they can react readily with active functional groups on the surface of coal.…”

Section: Introductionmentioning

confidence: 99%

Research on a Gas Index Reflecting the Sorption Process on Carbon Materials in Coal Mines

Wojtacha‐Rychter

Smoliński

2018

Sustainability

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Based on the concentration of gases such as propylene and ethylene in the atmosphere of a mine, it is possible to assess the development of a mine fire. With the increase of coal temperature, an increased emission of these gases has been observed. However, the experiment results presented in this paper prove that the use of propylene and ethylene for the prediction of the spontaneous combustion of coal have some limitations. It was found that during a flow of gas mixture through the sorption column, propylene and ethylene were sorbed on coal. This phenomenon manifests in smaller amounts of gases at the outlet of the sorption column. By comparing the concentration of ethylene to propylene at the inlet of the column, it was concluded that the ratio was usually below 3, whereas the range of the ratio at the end of the column was between 0.6–353. The value of gases ratio changed depending on the type of coal material in the column. The results of this experiment provide useful information that the quantitative relation between ethylene and propylene concentrations may indicate the occurrence of the sorption process on carbon materials in coal seams.

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Section: Introductionmentioning

confidence: 99%

Research on a Gas Index Reflecting the Sorption Process on Carbon Materials in Coal Mines

Wojtacha‐Rychter

Smoliński

2018

Sustainability

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“…Methane exists in coal seams mainly in two different states, adsorbed phase and bulk gas phase, with a small portion of methane dissolved in formation water. The adsorbed phase of CBM usually accounts for more than 80% of the total gas in place content in subsurface coal seams (Wang and Tang 2018). Gas adsorption behavior in different adsorbents depends on thermodynamic properties of gas and adsorbent interaction (Vishal et al 2013).…”

Section: The Adsorption Phenomena In Coal Seammentioning

confidence: 99%

A model of cement-formation interface failure length in supercritical CO2-ECBM and storage injection well considering the coal swelling effect under high pressure

Wang

2019

J Petrol Explor Prod Technol

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The swelling effect of high-pressure carbon dioxide (CO 2) in coal seam is obvious. In the restrained deep formation, it is converted to stress acting on the wellbore and the caprock. The action stress is concentrated near the wellbore and poses a threat to the cement-formation interface. Due to interface failure to micro-annulus, wellbore integrity will be lost and this will have an impact on carbon dioxide-enhanced coalbed methane recovery (CO 2-ECBM) and storage. In this paper, the pseudo-steady pressure distribution and steady pressure distribution of CO 2 injection process were established after considering the change in permeability of coal seam injected with high-pressure supercritical CO 2 , and the vertical stress distribution model was derived. A one-dimensional radial numerical simulation formed by iterative method was established. A model for calculating the failure length at the cement-formation interface is obtained, and the shear stress and debonding length at the interface at various injection rates and times are calculated. The results show that the shear stress on the cement-formation interface has the maximum magnitude on the height of the interface between coal seam and caprock. The shear stress generated by coal swelling may break the fragile cement-formation interface into a narrow debonding interface. The injection rate has an influence on the interface failure length. For the same total injection amount, low injection rate is beneficial to protect the cement-formation interface integrity. This study provides a reference for the design of maximum injection speed for CO 2-ECBM and storage to avoid leakage.

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“…where is the porosity, %; TRD is the true relative density, g/ cm 3 ; ARD is the apparent relative density, g/cm 3 . The relationship curve between the pressing load and porosity is shown in Figure 5.…”

Section: The Porosity Of the Remolded Coalmentioning

confidence: 99%

“…Adsorbed state methane and free-state methane exist in coal bodies, and the adsorbed state usually accounts for more than 80% of these forms. [1][2][3] Coal-bed methane has been increasingly recognized as a type of clean, unconventional natural gas resource. [4][5][6] Therefore, it is very important to promote the conversion of adsorbed gas into free gas.…”

Section: Introductionmentioning

confidence: 99%

Response characteristics of the resistivity and water content during the imbibition process in remolded coal without gas

Yue

Wang

Chen

et al. 2019

Energy Science & Engineering

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The water content distribution in a coal body is closely related to the gas distribution. It is difficult to directly determine the water content distribution in the process water imbibition. To retrieve the water content by the resistivity value and establish a relationship between the resistivity and water content, the response characteristics of the resistivity and water content of remolded coal formed under different loads are studied by a self‐designed resistivity experimental system. The results show that the resistivity of the remolded coal decreases over time during the imbibition process, including a rapidly decreasing stage and a slowly decreasing stage. The resistivity of the remolded coal is related to the water in the macropore in the rapidly decreasing stage. In the slowly decreasing stage, the resistivity is related to the contact between coal particles. The pressing load, imbibition range, and imbibition speed are negatively correlated with porosity. The resistivity of the steady state is also negatively correlated with the water content and pressing load. The relationship between the resistivity of the steady state and the water content fit a power function. This study reveals the law of resistivity and the water content during the imbibition process and provides an effective methodology to bridge the gap for measuring water content distribution during the imbibition process.

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New Insights from Supercritical Methane Adsorption in Coal: Gas Resource Estimation, Thermodynamics, and Engineering Application

Cited by 42 publications

References 46 publications

Research on a Gas Index Reflecting the Sorption Process on Carbon Materials in Coal Mines

Research on a Gas Index Reflecting the Sorption Process on Carbon Materials in Coal Mines

A model of cement-formation interface failure length in supercritical CO2-ECBM and storage injection well considering the coal swelling effect under high pressure

Response characteristics of the resistivity and water content during the imbibition process in remolded coal without gas

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