Shale’s Pore Structure and Sorption-Diffusion Characteristics: Effect of Analyzing Methods and Particle Size

Sharifigaliuk, Hamid; Mahmood, Syed Mohammad; Rezaee, Reza; Afolabi, Funsho; Haq, Izhar Ul

doi:10.1021/acs.energyfuels.2c00850

Cited by 10 publications

(15 citation statements)

References 63 publications

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“…The clay minerals were investigated and determined to contribute dramatically to the development of micropores and mesopores as well as surface area in shales. ,,,, To understand the effects of clay minerals on the APD in our samples, we collect a series of high-pressure methane excess adsorption isotherms of different kinds of clay minerals at 65 °C from the literature and estimate the APD using the same method above to demonstrate the effects of different clay minerals on APD (Figure ).…”

Section: Resultsmentioning

confidence: 99%

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Insights into Controls of Mineralogy and Pore Structure on the Density of Methane Adsorption Phase in Shales under Supercritical Conditions

2022

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With gradually increasing enhancing population and industrialization, exploitation of shale gas is enhancing in the world to satisfy the growing demand for energy worldwide. To exploit shale gas efficiently, accurate assessment of shale gas in place (GIP) is necessary for determining production strategies. Unlike free and dissolved gas, adsorbed gas contributes to the shale GIP up to 85% due to the well-developed surface area and micropores. Measured excess adsorption of methane (up to over 95% of subsurface shale gas) is often corrected to absolute adsorption to obtain the actual amount of adsorption under supercritical (or geological) conditions. During the correction, adsorption phase density (APD) is critical. However, the APD of subsurface shale gas and the effects of shale properties (e.g., mineralogy and pore structure) on APD remain poorly understood. A series of high-pressure methane adsorption isotherms (HPMAI) on Caney Shales were collected and analyzed in conjunction with other United States and Chinese shales from the literature at 35–125 °C and up to 15 MPa. A three-layer Ono–Kondo (OK3) model is utilized to derive the temperature- and pressure-dependent APD coupling low-pressure nitrogen adsorption isotherms (LPNAI) and HPMAI. X-ray diffraction and organic geochemistry are combined to reveal the mineralogy. Brunauer–Emmett–Teller, Barrett–Joyner–Halenda, and Horvath–Kawazoe analyses via LPNAI are used to investigate the pore structures. Results show that APD increases with organic matter (OM) proxied by total organic carbon and decreases with clay minerals and the sum of quartz and feldspar. OM dramatically contributes to the APD as multiple-layer adsorption exists, and the APD for OM could be 1.4–8.5 times that for clay minerals. Other inorganic minerals contribute less to APD. The properties and constitution of the surface area instead of the volume fraction contribute to the APD in shales. APD does not show an obvious correlation with micropore volume, likely related to the ratio of micropore volume to the total pore volume. This work provides a significant and comprehensive study of petrological factors that impact the APD of subsurface shale gas, which will improve the estimation of supercritical adsorption and shale GIP under reservoir conditions. Also, the findings in this work can provide applications for subsurface carbon dioxide adsorption and storage.

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Section: Resultsmentioning

confidence: 99%

“…All the measurements were conducted at Oak Ridge National Lab (ORNL). The Barrett–Joyner–Halenda (BJH) method is used for analysis of pore size distribution (PSD) of mesopores and developed macropores and the Horvath–Kawazoe (HK) method for PSD of micropores. ,,,− …”

Section: Methodsmentioning

confidence: 99%

Insights into Controls of Mineralogy and Pore Structure on the Density of Methane Adsorption Phase in Shales under Supercritical Conditions

2022

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“…6a, b. The NLDFT method normalized the pore volume to the pore width interval (differential volume dV/dW, L/Å g) to a standard slit-shaped pore model [76]. The results showed different PSD sharps for the three produced ACs.…”

Section: Physicochemical and Textural Propertiesmentioning

confidence: 99%

Systematic physicochemical characterization, carbon balance and cost of production analyses of activated carbons derived from (Co)-HTC of coal discards and sewage sludge for hydrogen storage applications

Kahilu

Bada

Mulopo

2023

Waste Dispos. Sustain. Energy

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Hydrothermal carbonization (HTC) technologies for producing value-added carbonaceous material (hydrochar) from coal waste and sewage sludge (SS) waste might be a long-term recycling strategy for hydrogen storage applications, cutting disposal costs and solving waste disposal difficulties. In this study, hydrochars (HC) with high carbon content were produced using a combination of optimal HTC (HTC and Co-HTC) and chemical activation of coal tailings (CT), coal slurry (CS), and a mixture of coal discard and sewage sludge (CB). At 850 °C and 800 °C, respectively, with a KOH/HC ratio of 4:1 and a residence time of 135 min, activated carbons (ACs) with the highest Brunauer–Emmett–Teller specific surface (SBET) of 2299.25 m2g− 1 and 2243.57 m2g− 1 were obtained. The hydrogen adsorption capability of the produced ACs was further studied using gas adsorption isotherms at 77 K. At 35 bars, the values of hydrogen adsorbed onto AC-HCT (AC obtained from HTC of CT), AC-HCS (AC obtained from HTC of CS), and AC-HCB (AC obtained from HTC of the blending of coal discard (CD) and SS) were approximately 6.12%, 6.8%, and 6.57% in weight, respectively. Furthermore, the cost of producing synthetic ACs for hydrogen storage is equivalent to the cost of commercial carbons. Furthermore, the high proportion of carbon retained (>70%) in ACs synthesized by HTC from CD and SS precursors should restrict their potential carbon emissions.

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“…The density functional theory (DFT) method was proposed to be employed for the whole range of the curve. 42 The sample shows a bimodal pore size distribution, corresponding to its complex and heterogeneous pore structure. The Mancos shale is water-wet, which was determined by the simultaneous contact angle, spontaneous imbibition, and floatation experiments and reported in our previous studies.…”

Section: Core Sample and Fluid Propertiesmentioning

confidence: 99%

Experimental and Modeling Study of Water Imbibition and Flowback in Shale: Prediction of Relative Permeability and Capillary Pressure Curves

et al. 2023

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Understanding the invasion and flowback processes of water, as the main source of hydraulic fracking fluid, is crucial for the proper evaluation and development of complex gas shale formations. Direct measurements of full gas−water relative permeability and capillary pressure curves by steady-state or unsteady-state techniques are not feasible in ultralow permeability shales. Therefore, the objective of this study is to investigate the dynamic rock−fluid properties of a Mancos shale sample by mimicking water imbibition and flowback experiments. To do so, a water injection experiment was done and tried to measure the flowback. After that, history matching on the experimental data of the water injection and flowback process was done to predict gas− water relative permeability data and capillary pressure curves. Low water flowback was observed, which insists on water entrapment in shale rocks. The results show a high threshold pressure and meaningful relative permeability of water, which can reduce the gas production rate dramatically. The saturation profiles show a high percentage of water in the invaded zone (>75%); however, the continuous imbibition of water with time (increase in shut-in time) helps the front of the invasion zone to move further deep into the shale, which enhances gas production. The S-shape gas relative permeability curve most likely represents the actual trend of the curve. An optimum shut-in time was predicted, which enables us to avoid delays in starting production operations.

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Shale’s Pore Structure and Sorption-Diffusion Characteristics: Effect of Analyzing Methods and Particle Size

Cited by 10 publications

References 63 publications

Insights into Controls of Mineralogy and Pore Structure on the Density of Methane Adsorption Phase in Shales under Supercritical Conditions

Insights into Controls of Mineralogy and Pore Structure on the Density of Methane Adsorption Phase in Shales under Supercritical Conditions

Systematic physicochemical characterization, carbon balance and cost of production analyses of activated carbons derived from (Co)-HTC of coal discards and sewage sludge for hydrogen storage applications

Experimental and Modeling Study of Water Imbibition and Flowback in Shale: Prediction of Relative Permeability and Capillary Pressure Curves

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