Experimental research on increasing effect of water injection in coal seam with chelating agent

Xu, Lianman; Lu, Kaixuan; Yi-shan, Pan; Lv, Xiangfeng

doi:10.1080/15567036.2019.1682723

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…Coal seam water injection can change the physical and mechanical properties of the coal seam, soften the mechanical properties of the coal seam, and reduce the outburst proneness of the coal seam. 5,6 It is also possible to construct large-diameter pressure relief boreholes in coal seam in the delineated hazardous area to reduce bearing capacity and transfer stress. 7,8 However, the method of using coal seam water injection to solve the rock burst problem is ineffective, and the water injection time is longer.…”

Section: Introductionmentioning

confidence: 99%

“…Coal seam water injection can be used to solve the problems of rock burst and coal and gas outburst during coal seam mining. Coal seam water injection can change the physical and mechanical properties of the coal seam, soften the mechanical properties of the coal seam, and reduce the outburst proneness of the coal seam 5,6 . It is also possible to construct large‐diameter pressure relief boreholes in coal seam in the delineated hazardous area to reduce bearing capacity and transfer stress 7,8 .…”

Section: Introductionmentioning

confidence: 99%

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Hydraulic fracturing method for relieving stress concentration in remaining coal pillar in overlying goaf

Shao,

Huang,

Zhao

et al. 2024

Energy Science & Engineering

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The stress concentration caused by the presence of the remaining coal pillar in the overlying goaf can easily cause large deformation of the roadway in the lower seam and other problems. To solve this problem, the reasons for stress concentration caused by the remaining coal pillar in the overlying goaf were analyzed. A hydraulic fracturing method for relieving stress concentration has been proposed. By using hydraulic fracturing technology to remove the hanging roof on both sides of the coal pillar and weaken the coal pillar system, high stress is transferred to the goaf. The degree of stress concentration in coal pillars and surrounding rock of roadway can be reduced by 47% and 26%, respectively. This method can also solve the stress concentration problem of the remaining ore pillar in the overlying goaf of the metal ore. This method has been applied in the coal mine. The deformation of the surrounding rock of the test roadway after hydraulic fracturing has been reduced by more than 60%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydraulic fracturing method for relieving stress concentration in remaining coal pillar in overlying goaf

Shao,

Huang,

Zhao

et al. 2024

Energy Science & Engineering

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“…A large number of experiments on pulverized coal prevention and control have been conducted in the lab and by field study [5][6][7]. It is found that the surface wetting properties of pulverized coal can be greatly changed by the introduction of surfactants [8][9][10][11][12][13][14][15][16][17][18] or changing its particle size and other variables, providing a theoretical basis for pulverized coal control [19][20][21]. Some scholars also studied pulverized coal control from the perspective of its migration in propped fracture by simulating its intrusion process into propped fracture in the lab.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Migration and Intrusion Characteristics of Pulverized Coal in Propped Fractures

et al. 2023

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Aiming at the problem of pulverized migration and plugging propped fractures during coal seam fracturing, we experimentally studied the pressure changes and pulverized coal blocking characteristics with deionized water and solutions of three surfactants including 1227 (C21H38ClN), SDS (C12H25SO4Na) and TX-100 (C34H62O11). A device capable of visualizing propped fractures was established, and simulation experiments were conducted with solutions of different surfactants at different injection flow rates. The obtained images were binarized and analyzed to quantify the pulverized coal blockage degrees of facture under different conditions. The experimental results show that: (1) The higher the injection flow rate, the higher the inlet pressure. (2) All three surfactants can lower the injection pressure, as compared with water alone. SDS decreases the injection pressure more obviously at low injection flow rates, and the other two perform better at high injection flow rates. (3) Similar to their effects on inlet pressure, the ratio of pulverized coal in SDS solution is lower at low injection flow rates, while TX-100 and 1227 solutions show lower ratios of pulverized coal at high injection flow rates. Our work has provided a theoretical support for coal blockage removal and pressure reduction in propped fractures during coal seam fracturing to improve coal seam permeability and further improves the dust prevention effect of coal seam water injection.

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“…He proposed a softening agent to soften coal, which can addressed the problems of hard coal mining, dust removal, and gas dilution. Xu et al (2019) and Lu and Xu (2020a, 2020b) used a chelating agent and surfactant combination made of composite wetting agent for coal seam water injection; its “humidifying pore”‘ effect was remarkable. Nabeel, Khan, and Sharma (2009) showed that under mild conditions, using NaOH and H 2 SO 4 , continuous extraction can remove more than 75–80% of the minerals in coal.…”

Section: Introductionmentioning

confidence: 99%

Desensitization effect of chemically induced coal components at room temperature: An experimental study

Chen³

et al. 2022

Energy Exploration & Exploitation

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This study was conducted to address the rock burst problem caused by serious stress concentrations in coal seams. Based on the principle of inducing agent corrosion affecting coal components to soften coal, different inducers were selected to study the desensitization effect of acid leaching induction on coal components. The microscopic behavior characteristics of coal under acid leaching were analyzed, and the qualitative and quantitative laws were obtained for different acid leaching times and microscopic behavior characteristics. The results show the following: (1) The mixed acid solution as an inducer has the effect of immersion, dissolution, and fracture on coal. During the reaction process, the internal pores of the coal expand, and the height of the external liquid decreases. The mixed acid solution had the best effect in terms of the removal of minerals in coal. (2) Under microscopic conditions, the internal crack width of the coal body expanded several times after mixed acid soaking; the difference in the unevenness before and after compression fracture was stable at 25–27%, and the mixed acid expanded the gap in the coal. (3) This practical study shows that the characterization changes of the mixed acid solution, injected into the borehole, combines the characteristics of the citric acid and phosphoric acid solution. The minerals around the borehole are dissolved, and the debris fuses with the solution. The liquid is viscous and forms a film on the surface of the solution. The mixed acid has a more obvious effect on the immersion and dissolution of coal.

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Experimental research on increasing effect of water injection in coal seam with chelating agent

Cited by 8 publications

References 13 publications

Hydraulic fracturing method for relieving stress concentration in remaining coal pillar in overlying goaf

Hydraulic fracturing method for relieving stress concentration in remaining coal pillar in overlying goaf

Experimental Study on Migration and Intrusion Characteristics of Pulverized Coal in Propped Fractures

Desensitization effect of chemically induced coal components at room temperature: An experimental study

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