Effect of coal petrology and pressure on wetting properties of wet coal for CO2 and flue gas storage

Kaveh, N. Shojai; Wolf, Karl‐Heinz; Ashrafizadeh, Seyed Nezameddin; Rudolph, E.S.J.

doi:10.1016/j.ijggc.2012.09.009

Cited by 64 publications

(42 citation statements)

References 42 publications

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“…Different authors have investigated the wettability behavior of coal based on contact angle measurements for the coal-water-air system (Eissler and Van Holde, 1962;Gutierrez-Rodriguez et al, 1984;Orumwense, 2001;Sakurovs and Lavrencic, 2011;Shojai et al, 2012;Siemons et al, 2006a;Siemons et al, 2006b). The coal wettability behavior was found to be a function of the coal rank and their maceral type.…”

Section: Introductionmentioning

confidence: 99%

“…Coal wettability behavior depends on the pressure and its dependence is a function of the coal rank (Sakurovs and Lavrencic, 2011;Shojai Kaveh et al, 2012;Siemons et al, 2006a). Sakurovs and Lavrencic, 2011;Shojai et al, 2012 investigated the wettability behavior at elevated pressures (1500 psi) for different coal ranks.…”

Section: Introductionmentioning

confidence: 99%

“…For high ranking coal, the wettability was altered from water-wet to gas-wet with CO 2 injection at higher pressure. Sakurovs and Lavrencic, 2011;Shojai et al, 2012 indicated that the wettability behavior of CO 2 in wet coal was dependent on the adsorption behavior rather than the CO 2 properties such as solubility and density. Sakurovs and Lavrencic, 2011;Shojai et al, 2012 indicated that the wettability behavior of CO 2 in wet coal was dependent on the adsorption behavior rather than the CO 2 properties such as solubility and density.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Water Salinity, CO2 Solubility, and Gas Composition on Coal Wettability

Ibrahim

Nasr‐El‐Din

2015

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Geological sequestration of CO 2 in coal seams has become an attractive carbon sequestration technology for two reasons. First, the injection of CO 2 or mixtures of CO 2 and N 2 enhances methane production from coalbeds (ECBM). Second, it reduces the effect of global warming by storing CO 2 . The sequestration of CO 2 in Tiffany and Allison fields in the San Juan Basin is an example of this technology. The efficiency of this process is strongly dependent on the wetting behavior of the coal-water-CO 2 system and the CO 2 diffusion rate from the cleat network, through the micro-cleats, and to the matrix surface, which is improved if the coal is CO 2 wet.This study aims to investigate the effects of the salt type and concentration of coal seam water, the solubility of CO 2 in water, and the injected gas composition on the wettability of a highly volatile bitumen coal with 82 wt% carbon content from Bull Hill, Oklahoma. Contact angles in the coal-water-CO 2 system were measured using a captive bubble method at pressures up to 1000 psi. Adsorption isotherm measurements were conducted to confirm the effect of salt concentration on the CO 2 /coal surface adsorption behavior. The zeta potential was measured to examine the effects of the salt concentration on coal hydrophobicity.The results showed that the coal tended to be CO 2 wet as the pressure increased where the contact angle changed from 80°at atmospheric pressure to 125°at high pressure (1000 psi). It was found that the salt concentration increased the coal wettability to the CO 2 . NaCl increased the contact angle values from 125°t o 140°with a NaCl concentration of 15 g/L. It was found that MgCl 2 and CaCl 2 slightly increased the contact angles. These results were confirmed by measuring the adsorption isotherm and the zeta potential at different water salinities. The CO 2 adsorption was improved as the salt concentration increased and the absolute zeta potential value decreased, especially in NaCl cases. It was found that the contact angles of flue gases were generally smaller than those of CO 2 and the contact angles did not exceed 90°even at high pressures and high N 2 contents (81°at 1000 psi for 100% N 2 ). The solubility of CO 2 in water did not affect the stabilized contact angle values but it minimize the stabilization time as the solubility increased.Based on these observations, for CO 2 storage and ECBM purposes, injection of CO 2 into highly volatile bitumen coal seams is more efficient as the salt concentration content increase. However, other types of coals might show different behaviors due to their varying rank and mineral compositions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Water Salinity, CO2 Solubility, and Gas Composition on Coal Wettability

Ibrahim

Nasr‐El‐Din

2015

All Days

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“…When the aqueous phase is not completely saturated with CO 2 , the injectivity and the gas distribution in the reservoir are not only influenced by the rock properties but also by the diffusion of CO 2 into the aqueous phase (Shojai Kaveh et al 2011, Shojai Kaveh et al 2012). …”

Section: Introductionmentioning

confidence: 99%

Study of Shale Wettability for CO2 Storage

et al. 2015

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SUMMARYFor a water-saturated cap-rock, which consists of a low-permeability porous material, the wettability of the reservoir rock-connate water-CO2 system and the interfacial tension (IFT) between CO2 and connate water are the significant parameters for the evaluation of the capillary sealing. Also, the amount of capillary-trapped CO2 depends on the wettability of reservoir rocks. The wettability of the rock matrix has a strong effect on the distribution of phases within the pore space and thus on the entire displacement mechanism and storage capacity. In this work, the equilibrium contact angles of water/shale system were determined with CO2 for a wide range of pressures at a constant temperature of 318 K by using the dynamic captive bubble method. The results reveal that intermediate-wet conditions and hence possible leakage of CO2 must to be considered at relatively high pressures, however, the salt concentration of the water in the shales plays an important role too. The results show that this estimate is highly dependent on the pore structure, fluid composition and pressure/temperature conditions of the reservoirs. These properties need to be first evaluated before estimates for shale capillarity is used.

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“…They modelled seismic activities in the subsurface due to CO 2 injection for a North Sea reservoir. The last paper on storage deals with the interaction between water and coal (Shojai Kaveh et al, 2012). This so-called wetting behaviour of the coal influences the CO 2 storage capacity in coal layers.…”

Section: Articles In Special Issuementioning

confidence: 99%