Experimental research of the surfactant effect on seepage law in coal seam water injection

Wei, Jianping; Jiang, Wan; Si, Leilei; Xu, Xiangyu; Wen, Zhihui

doi:10.1016/j.jngse.2022.104612

Cited by 30 publications

(11 citation statements)

References 25 publications

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“…The second type is to add some special materials in water to reduce the surface tension of water and improve the wetting effect on coal seams. Wei et al 23 stated that surfactant solutions have low surface tension and contact angle and can facilitate the substitution of solid−gas interfaces by solid− liquid interfaces in the water injection process in coal seams, so that coal can be more rapidly wetted. Han et al 24 found that anionic surfactants and cationic imidazole-containing liquids show a strong synergistic effect which can greatly improve the wettability of coal.…”

Section: Introductionmentioning

confidence: 99%

Study of Time-Varying Laws of Stability and Wettability of SiO₂–H₂O Nanofluids with Different Particle Sizes

Zhao,

Tian,

Xie

et al. 2023

Ind. Eng. Chem. Res.

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It has been proven that SiO2–H2O nanofluids have great application potential for water injection in coal seams. To explore the influences of the particle size on the stability and wettability of SiO2–H2O nanofluids, sedimentation observation of nanoparticles (NPs), viscosity tests, pH tests, surface tension tests, and contact angle tests were performed for SiO2–H2O nanofluids with different particle sizes. The research shows that the larger the particle size of SiO2 NPs, the more obvious the aggregation and sedimentation of NPs. The smaller the particle size of SiO2 NPs is, the lower the surface tension and contact angle of the SiO2–H2O nanofluids. As time goes on, SiO2–H2O nanofluids successively show time-varying characteristics in the low stability stage, moderate stability stage, and high stability stage. Therein, the low stability stage is the optimal period for enhancing the water injection in coal seams by nanofluids. The research provides theoretical support for using SiO2–H2O nanofluids to enhance water injection in coal seams.

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Section: Introductionmentioning

confidence: 99%

Study of Time-Varying Laws of Stability and Wettability of SiO₂–H₂O Nanofluids with Different Particle Sizes

Zhao,

Tian,

Xie

et al. 2023

Ind. Eng. Chem. Res.

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“…To improve the pore fracture structure of coal bodies, increase the permeability of coal seams, and decrease the likelihood of gas pressure and coal and gas protrusion issues, various hydraulic permeability enhancement techniques, such as hydraulic fracturing, hydraulic cutting, coal seam acidification, and coal seam water injection, are currently widely used in engineering. − The coal seam surface structure modification technique has emerged as a result of scientific and technological advancement. − This technology is primarily used to improve the connectivity of the internal pore structure of the coal body via alkaline solution or alkaline ion erosion of blockages in the pore structure of the coal body or certain mineral components of the coal body itself, which cause chemical erosion of the coal body through chemical reaction with certain minerals in the coal, thereby improving the permeability of the coal body and affecting the gas adsorption performance.…”

Section: Introductionmentioning

confidence: 99%

“…At present, many scholars are using different surfactants to change the wettability of the coal surface, which in turn affects the pore structure and adsorption properties of coal. − Meng et al and Liu et al formed an effective directional closely aligned adsorption layer after surfactant treatment of lignite, which facilitates coal adsorption. Ma et al concluded that SPAN80 can change the wettability of the coal surface and attenuate the effect of oxygen-containing functional groups on the coal surface through hydrogen bonding adsorption by the surfactant SPAN80 on the promotion of coal slurry flotation.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Study of High-Rank Coal in an Alkaline Solution at the Chengzhuang Mine

Sun

Liang

et al. 2023

Langmuir

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To study the adsorption performance of coal bodies after alkaline solution erosion and the microscopic mechanism of alkali erosion on coal bodies, isothermal adsorption experiments at different pH values and with different numbers of soaking days were conducted on high-order coal bodies from the Chengzhuang mine. The results showed that the adsorption capacity of the coal bodies after alkali leaching was improved compared to that of the original coal, all of which was in accordance with the Langmuir equation. The unit adsorption capacity of coal samples increased gradually with an increase in the number of soaking days and solution pH, reaching the maximum at pH 13 and eight soaking days. The adsorption constant a of the coal sample was positively correlated with the pH, and the number of soaking days was a power exponential function; the adsorption constant b increased gradually with an increase in the pH of the solution and increased first and then decreased with an increase in the number of soaking days. The change in the adsorption of coal samples occurs because the alkaline solution reacts with the minerals in the coal as well as the mineral ions, and the resulting complex gels and precipitates block the pore channels of the coal body, which in turn inhibits the adsorption of gases. The presence of Na, Mg, Al, Si, Ca, Fe, and other elemental compounds detected in the generated sediments verified the mechanism of alkaline solution erosion. The changes in the microscopic pore structure of the coal body were quantified by low-temperature liquid nitrogen adsorption experiments. The small and medium pore volumes of the coal samples reached the maximum values at pH 13 and with eight soaking days, which is in agreement with the conclusion of optimal alkali modification.

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“…At present, the commonly used rock burst prevention technologies in most coal mines include largediameter boreholes, deep hole blasting, coal seam water injection, etc (Konicek et al 2011;Li et al 2016;Lin et al 2020;Liu et al 2022;Wei et al 2022;Zou et al 2022). However, the above technologies have certain disadvantages in field application.…”

Section: Introductionmentioning

confidence: 99%

Principle and application of high pressure hydraulic slotting pressure relief and energy release in deep roadway

Ning

Yang

et al. 2023

Preprint

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The essence of deep roadway dynamic disaster lies in the sudden release of surrounding rock elastic energy. High-pressure hydraulic slotting (HPHS) has become a new method for pressure relief and energy release of roadway surrounding rock. In view of the lack of qualitative description of the response relationship between parameters of HPHS and pressure relief and energy release degree of roadway surrounding rock. In this paper, theoretical analyses, numerical simulations, on-site industrial practice, and other methods are comprehensively used to carry out relevant research work. First, the structure model of pressure relief and energy release of coal by HPHS in the deep roadway was established, the principle of pressure relief and energy release by HPHS was revealed, and the principles and methods for determining the pressure relief parameters such as the range of slot, the spacing of the slot hole, and the spacing of slot were proposed. Three evaluation indexes of pressure relief and energy release effect of coal after HPHS were proposed, namely, stress ratio of coal, elastic energy density ratio of coal, and displacement rate of the roadway rib. According to the evaluation indexes, the degree of pressure relief and energy release was divided into three levels: reverse pressurization, full pressure relief, and transitional pressure relief. Then, the FLAC3D numerical model was constructed, the level of pressure relief and energy release under different HPHS parameters was analyzed, and the optimal slotting parameters were determined. Finally, the on-site industrial practice was carried out in the 7312 working face of Xinhe Coal Mine. The effect test shows that the effect of pressure relief and energy release was remarkable after HPHS was adopted on the roadway surrounding rock, which can effectively reduce the risk of rock bursts. The research results can further improve HPHS technology systems, and provide a theoretical basis and technical reference for the stability control of deep roadway surrounding rock.

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Experimental research of the surfactant effect on seepage law in coal seam water injection

Cited by 30 publications

References 25 publications

Study of Time-Varying Laws of Stability and Wettability of SiO₂–H₂O Nanofluids with Different Particle Sizes

Study of Time-Varying Laws of Stability and Wettability of SiO₂–H₂O Nanofluids with Different Particle Sizes

Microstructure Study of High-Rank Coal in an Alkaline Solution at the Chengzhuang Mine

Principle and application of high pressure hydraulic slotting pressure relief and energy release in deep roadway

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Experimental research of the surfactant effect on seepage law in coal seam water injection

Cited by 30 publications

References 25 publications

Study of Time-Varying Laws of Stability and Wettability of SiO2–H2O Nanofluids with Different Particle Sizes

Study of Time-Varying Laws of Stability and Wettability of SiO2–H2O Nanofluids with Different Particle Sizes

Microstructure Study of High-Rank Coal in an Alkaline Solution at the Chengzhuang Mine

Principle and application of high pressure hydraulic slotting pressure relief and energy release in deep roadway

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Product

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Study of Time-Varying Laws of Stability and Wettability of SiO₂–H₂O Nanofluids with Different Particle Sizes

Study of Time-Varying Laws of Stability and Wettability of SiO₂–H₂O Nanofluids with Different Particle Sizes