Experimental study of wetting-seepage effect of microemulsion for the coal seam water injection

Yan, Song; Huang, Qiming; Qin, Cunli; Wang, Gang; Fan, Jiuyuan

doi:10.1016/j.molliq.2021.116361

Cited by 19 publications

(2 citation statements)

References 55 publications

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“…Secondly, the surfactant JFCS reduces the surface tension of the solution, thereby altering the characteristics of the interface between the two phases and increasing the moisture content within the coal body. This enhances the mobility of water within the internal pores of the coal samples, leading to a reduction in strength and an increase in plasticity of the coal body 28 . Furthermore, the chelating agent IDS interacts with the mineral particles and cement within the coal, causing their dissolution and the formation of new fissures.…”

Section: Findings and Analysismentioning

confidence: 99%

Experimental study on the impact of “IDS + JFCS” complex wetting agent on the characteristics of coal bodies

Wang,

Xu,

Qin

et al. 2024

Sci Rep

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As China's coal mines have transitioned to deep mining, the ground stress within the coal seams has progressively increased, resulting in reduced permeability and poor wetting ability of conventional wetting agents. Consequently, these agents have become inadequate in fulfilling the requirements for preventing washouts during deep mining operations. In response to the aforementioned challenges, a solution was proposed to address the issues by formulating a composite wetting agent. This composite wetting agent combines a conventional surfactant with a chelating agent called tetrasodium iminodisuccinate (IDS). By conducting a meticulous screening of surfactant monomer solutions, the ideal formulation for the composite wetting agent was determined by combining the monomer surfactant with IDS. Extensive testing, encompassing evaluations of the composite solution's apparent strain, contact angle measurements, and alterations in the oxygenated functional groups on the coal surface, led to the identification of the optimal composition. This composition consisted of IDS serving as the chelating agent and fatty alcohol polyoxyethylene ether (JFCS).Subsequent assessment of the physical and mechanical performance of the coal briquettes treated with the composite wetting agent revealed notable enhancements. These findings signify significant advancements in the field and hold promising implications. Following the application of the composite wetting agent, notable reductions were observed in the dry basis ash and dry basis full sulfur of coal. Additionally, the water content within the coal mass increased significantly, leading to a substantial enhancement in the wetting effect of the coal body. This enhanced wetting effect effectively mitigated the coal body’s inclination towards impact, thereby offering technical support for optimizing water injection into coal seams and preventing as well as treating impact ground pressure.

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Section: Findings and Analysismentioning

confidence: 99%

Experimental study on the impact of “IDS + JFCS” complex wetting agent on the characteristics of coal bodies

Wang,

Xu,

Qin

et al. 2024

Sci Rep

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“…Injecting water into coal seams can enhance the water content, alter the coal’s mechanical properties, and diminish the risk of outbursts, serving as an effective strategy for preventing and controlling coal and gas outbursts. − Nonetheless, the inherent hydrophobic nature of coal leads to low water injection efficiency, making it challenging for conventional methods to guarantee the prevention of outbursts. − Consequently, enhancing the wettability of coal, thereby increasing its water absorption capacity and ultimately its water content, is crucial for the effectiveness of water injection in coal seams.…”

Section: Introductionmentioning

confidence: 99%

Influence of Nanoparticle–Surfactant Compound Solution on Coal Wettability

Zou,

Huo,

Liu

et al. 2024

Energy Fuels

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Poor coal wettability limits the effectiveness of water injection in coal seams. Nanofluids and surfactants can improve the coal wettability. In this paper, the impact of four types of composite fluids containing surfactants and SiO 2 nanoparticles on coal wettability was investigated. By analyzing the variation in contact angle and moisture content as well as functional groups before and after modification, it is found that the compound solution can effectively enhance coal surface wettability and increase the moisture content of coal samples. Compared to deionized water and SiO 2 nanofluids, the contact angle of coal modified by the compound solution does not rebound quickly with the loss of moisture. Moreover, the average strengthening rate and water absorption mass strengthening rate were utilized to quantify the modification effects of the compound solution. It can be seen that the combination of cationic surfactant CTAB with SiO 2 nanoparticles provides the most effective modification. FTIR results imply that the modification results in increased activity of free hydroxyl groups in the coal, enhancing its hydrophilicity. The synergistical interaction of nanoparticles and surfactants can occupy vacant adsorption sites on the coal surface. Additionally, surfactants adhere to the nanoparticle surface due to van der Waals forces, while hydrophilic groups attract water molecules to the coal. The research achievements provide a theoretical foundation for the potential application of nanoparticle−surfactant compound solution in coal seam water injection.

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Experimental study on coal dust wettability strengthened by surface active ionic liquids

Zhang

Jiang

et al. 2022

Environ Sci Pollut Res

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Experimental study of wetting-seepage effect of microemulsion for the coal seam water injection

Cited by 19 publications

References 55 publications

Experimental study on the impact of “IDS + JFCS” complex wetting agent on the characteristics of coal bodies

Experimental study on the impact of “IDS + JFCS” complex wetting agent on the characteristics of coal bodies

Influence of Nanoparticle–Surfactant Compound Solution on Coal Wettability

Experimental study on coal dust wettability strengthened by surface active ionic liquids

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