Investigation on the adsorption kinetics and diffusion of methane in shale samples

Zou, Jie; Rezaee, Reza; Yuan, Yaochu

doi:10.1016/j.petrol.2018.08.010

Cited by 34 publications

(9 citation statements)

References 32 publications

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“…Table presents the value of the slope for the three cases and it shows that the slope varies between 0.0070 and 0.124. Overall, higher adsorption rates were seen at lower pressure level (2.0 MPa) for the three cases, which is in with the findings reported in refs and . Another important point to note is CTAB treated-shale exhibited a faster adsorption rate as compared to the baseline case.…”

Section: Resultssupporting

confidence: 88%

“…The full details of the volumetric adsorption experimental procedures are discussed in section . The fractional CH 4 volumetric uptake ( M t / M ∞ ) at any time t was calculated by the following approximation used in ref , where P 0 is the first pressure reading the adsorption cell, P t is the pressure in the cell at time t and P ∞ is the equilibrium pressure.…”

Section: Resultsmentioning

confidence: 99%

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Mechanism of CH₄ Sorption onto a Shale Surface in the Presence of Cationic Surfactant

et al. 2021

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A substantial amount of water used for fracking shale formations is trapped by capillary and interfacial forces. Such trapped water is detrimental to gas production because of its potential to obstruct gas’s desorption and, subsequently, its flow path. Surfactants are proposed to alleviate the problem; however, further insight is required to understand the underlying mechanism. In this study, a cationic surfactant, namely, cetyltrimethylammonium bromide (CTAB), and a clay-rich Marcellus shale are used to investigate and explain the mechanism. The study encompasses a series of systematic experiments and molecular simulations. First, laboratory measurements of CH4–brine interfacial tension, CH4 surface excess, and zeta potential at different CTAB concentrations were conducted. Then, we evaluated CH4 adsorption in Marcellus shale before and after treatment with CTAB. Second, a molecular dynamics simulation by GROMACS software was used to explain the phenomenon at the molecular level. Experimental results indicated that CTAB reduced the CH4–brine interfacial tension by up to 80%. The zeta potential data showed that shale’s dominant surface charge was altered from negative to positive after treatment with CTAB. Furthermore, the presence of CTAB has significantly influenced the distribution of CH4 in the aqueous phase as indicated by the changes in the CH4 surface excess concentration. Moreover, the adsorbed CH4 amount decreased with increasing CTAB concentration when the CTAB concentration was kept below the critical micelle concentration (CMC). The reduction in adsorbed CH4 was explained by the molecular dynamics simulation results, which revealed a 62% shrinkage in vertical distances between CH4 molecules and clays after introducing CTAB. Simulation findings also unfold that CTAB has reduced the density distribution of CH4 molecules along with clay layers by 64%. One of the more significant result of this study is that surfactants injected at above CMC values can lessen fracking water trapping by reducing CH4 brine interfacial tension, changing surface charges, and reducing molecular distances between CH4 and hydrophilic clays.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Mechanism of CH₄ Sorption onto a Shale Surface in the Presence of Cationic Surfactant

et al. 2021

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“…Kerogen tends to be oil wet as the O/C ratio decreases, 27,36 and the TOC content of mixed wet shale is greater than that of water wet shale. 37,38 Most of the clay minerals of shale are hydrophilic; 37,39 however, clay minerals also exhibit oil wetting characteristics due to the presence of migratory OM. 16,40 Terrestrial detrital quartz is regarded as a hydrophilic mineral, 38 whereas biogenic quartz is more oil wet.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Shale Wettability Using Calorimetry: Experimental Results and Model

Chen

Zhang

et al. 2021

Energy Fuels

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Wettability affects the occurrence and exploitation of gas and oil in shale matrices; however, conventional methods for shale wettability evaluation (i.e., contact angle testing, imbibition method, flotation testing, surface tension method, and so forth) have limitations, which, in turn, lead to ambiguous or even contradictory results. Thus, in this paper, the calorimetry method is introduced to evaluate the wettability of shale, and the feasibility of the calorimetry method is discussed. The results show that transitional shale can be classified as mixed wet or more water wet in the southern North China Basin, and the calorimetry method exhibits higher accuracy and applicability. By considering the influence of the interaction between different factors on wettability, a geological prediction model of transitional shale wettability is established, which is helpful for the wettability evaluation of transitional shale and provides theoretical support for the exploitation of unconventional gas and oil. Oil wetting is mainly affected by pyrite and mixed layer illite−smectite (strongly positive influence), whereas water wetting is mainly affected by pyrite (negative influence), dolomite, and siderite (positive influence). The relative wettability index, wetting heat, heat flow rate, and other parameters derived from the calorimetric experiments can be used to evaluate wettability, which can provide theoretical support for the exploitation of unconventional gas and oil.

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“…Thus, the fractal dimension only reveals the Energy & Fuels roughness and complexity of open pores with the pore diameter ranging from 1.2 to 32 nm. 73 However, given that these pores are the main space for fluid adsorption, diffusion, and flow 29,74 and the alterations in both roughness and complexity of pores of shales before and after microwave irradiation are critical to understand the influence of microwave irradiation on pore structure characteristics of shales; the FHH equation combined with low-temperature N 2 adsorption data was used to calculate D of the shale samples in our study. The FHH equation is 72…”

Section: Methodsmentioning

confidence: 99%

Role of H₂O of Gas-Bearing Shale in Its Physicochemical Properties and CH₄ Adsorption Performance Alteration Due to Microwave Irradiation

et al. 2021

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Microwave irradiation is available to produce shale gas. Practical gas-bearing shale reservoirs often contain water (H2O). Given the special physicochemical property of H2O and its occurrence rule in the gas-bearing shale matrix, the presence of H2O has potential effect on electromagnetic energy penetration and dielectric property of the shale matrix, therefore affecting application of microwave irradiation to produce the chief component of shale gas, that is, methane (CH4), from the shale reservoir. Hence, to further explore shale gas production via microwave irradiation, the impact of H2O of gas-bearing shale in its physicochemical property response to microwave irradiation was mainly investigated. The H2O dependence of CH4 adsorption capability alteration due to microwave irradiation was also addressed. The results indicate that microwave irradiation exerts minor impact on the micropore of both dry and moist shales but a noticeable impact on their mesopore. Specifically, both the mesoporous surface area and volume of dry and moist shales decrease after microwave irradiation. The presence of H2O further decreases the typical mesoporous parameters including pore surface area and pore volume of shales in general. Moreover, fractal analysis reveals that both the roughness of the pore surface and complexity of pore structure decrease for all the shales after microwave irradiation, and those of moist shale after microwave irradiation decrease even further, thus facilitating shale gas migration and diffusion within the shale matrix. As for the surface chemical property of shale, the total amount of oxygenic groups consisting of highly conjugated carbonyl, conjugated carbonyl, and carboxyl of dry shales rises after microwave irradiation, but the aromaticity drops. Also, the same changing rule in functional groups is also found for moist shale after microwave irradiation; however, the change is even more pronounced. Finally, the CH4 adsorption capacity of both dry and moist shales decreases after microwave irradiation. In comparison to dry shale, CH4 adsorption capacity of moist shale containing low total organic carbon (TOC) and H2O decreases, but that of moist shale with high TOC content and H2O content increases. These alterations in CH4 adsorption capability of various moist shales are relevant to their pore structure and functional group response to microwave irradiation. Overall, the presence of H2O is beneficial for further weakening the adsorption affinity between CH4 and the shale matrix and strengthening migration capability of CH4 under microwave irradiation, thus making microwave irradiation become a competitive technology regarding shale gas production.

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Investigation on the adsorption kinetics and diffusion of methane in shale samples

Cited by 34 publications

References 32 publications

Mechanism of CH₄ Sorption onto a Shale Surface in the Presence of Cationic Surfactant

Mechanism of CH₄ Sorption onto a Shale Surface in the Presence of Cationic Surfactant

Measurement of Shale Wettability Using Calorimetry: Experimental Results and Model

Role of H₂O of Gas-Bearing Shale in Its Physicochemical Properties and CH₄ Adsorption Performance Alteration Due to Microwave Irradiation

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Investigation on the adsorption kinetics and diffusion of methane in shale samples

Cited by 34 publications

References 32 publications

Mechanism of CH4 Sorption onto a Shale Surface in the Presence of Cationic Surfactant

Mechanism of CH4 Sorption onto a Shale Surface in the Presence of Cationic Surfactant

Measurement of Shale Wettability Using Calorimetry: Experimental Results and Model

Role of H2O of Gas-Bearing Shale in Its Physicochemical Properties and CH4 Adsorption Performance Alteration Due to Microwave Irradiation

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Product

Resources

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Mechanism of CH₄ Sorption onto a Shale Surface in the Presence of Cationic Surfactant

Mechanism of CH₄ Sorption onto a Shale Surface in the Presence of Cationic Surfactant

Role of H₂O of Gas-Bearing Shale in Its Physicochemical Properties and CH₄ Adsorption Performance Alteration Due to Microwave Irradiation