Experimental Research on Performance of New Gas Drainage Borehole Sealing Material with High Fluidity

Guo, Xin; Xue, Sheng; Zheng, Chen; Li, Yaobin

doi:10.1155/2021/6645425

Cited by 5 publications

(6 citation statements)

References 16 publications

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“… 20 , 21 Using conventional yellow earth, cement mortar, polyurethane grouting hole sealing process such as fixed after forming, although before the fixed shape around the drilling and the drilling of microcracks have certain effects to block, but the new fracture cannot be affected by mining derived after sealing effect, at the same time the traditional solid hole sealing material cannot with the forced deformation of the drill, it is easy to cause the failure of borehole seal. 22 − 24 Therefore, sealing the drilling hole and the surrounding coal body to trap the gas in the coal body effectively 25 , 26 and extract the gas efficiently through the drilling hole has become one of the key technologies to process the co-mining of coal gas 27 − 29 and the green mining of coalbed methane. 30 − 32 …”

Section: Introductionmentioning

confidence: 99%

“…The destruction of the structure of the coal around the gas extraction borehole by drilling is the main reason for the failure of borehole seal, as it reduces the strength and compression capacity. Furthermore, the coal is prone to plastic deformation after compression, leading to a large number of microcracks in the coal and rock mass around the borehole. − In addition, new fissures evolve through the influence of mining and other factors from the microfissures in the borehole and its surrounding channels, thus further increasing the problem of sealing gas drainage boreholes. , Using conventional yellow earth, cement mortar, polyurethane grouting hole sealing process such as fixed after forming, although before the fixed shape around the drilling and the drilling of microcracks have certain effects to block, but the new fracture cannot be affected by mining derived after sealing effect, at the same time the traditional solid hole sealing material cannot with the forced deformation of the drill, it is easy to cause the failure of borehole seal. − Therefore, sealing the drilling hole and the surrounding coal body to trap the gas in the coal body effectively , and extract the gas efficiently through the drilling hole has become one of the key technologies to process the co-mining of coal gas − and the green mining of coalbed methane. − …”

Section: Introductionmentioning

confidence: 99%

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Development and Application of Water Sealing Technology for Gas Drainage Boreholes

Hai-jin

Gao

et al. 2021

ACS Omega

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The poor sealing effect of gas extraction boreholes causes low efficiency of gas extraction. As a consequence, the requirements of coal mine safety production are often not attained. The sealing effect of boreholes depends not only on the sealing material itself but also on the combination degree between the material and the hole wall and the structural change characteristics of the material during operation. Our theoretical analysis shows that the amount of liquid leakage increases with the gap width Δ h in a cubic law, decreases with the sealing hole viscosity in a hyperbolic form, increases linearly with the diameter of the borehole, and increases with the eccentricity in a quadratic function. We have developed a PD sealing material that has good compactness and sealing effects, excellent water retention performance, and an expansion rate of 1.29. The material can generate secondary expansion through microscopic development, which is beneficial to improve the quality of the sealing hole. HV-CMC has good stability in plugging mucus. In addition, the manual pump has been redeveloped to be portable and also to overcome the blockage of the suction valve of the original device. In addition, the auxiliary device for drilling and sealing has been invented. The field application demonstrates that the gas concentration and flow pressure difference of the new sealing borehole can be maintained at a high level in a short period of time and then decrease slowly with time. The resulting improved sealing effect demonstrates that our new approach has important theoretical and practical significance for mine gas drainage.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development and Application of Water Sealing Technology for Gas Drainage Boreholes

Hai-jin

Gao

et al. 2021

ACS Omega

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“…Thus, it is conducive to its own outward diffusion. The Ca(OH) 2 [29] and AFT cement [30] generated by the action of cement and water are attached to the surface of particles, which merely increases the action relationship between particles and does not play a role in the bulk density of aggregates. Thus, it has little effect on the fluidity of filling slurry.…”

Section: Liquidity Analysismentioning

confidence: 99%

Fluidity Influencing Factor Analysis and Ratio Optimization of New Filling Slurry Based on the Response Surface Method

Chang¹,

Hua²,

Liu³

et al. 2022

Journal of Renewable Materials

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The filling mining method is important in realizing the green mining of mineral resources. Aiming at the problems of land resource occupation, environmental pollution, and rational utilization of coal-based solid wastes such as coal gangue, fly ash, and desulfurization gypsum, a new paste filling material was developed with coal gangue, fly ash, and desulfurization gypsum as raw materials. The microstructure of the raw materials was analyzed by XRD and SEM. Combined with the Box-Behnken experimental design, the effect of each component on the fluidity of the filling slurry was analyzed through the response surface analysis. The significance of each component on its bleeding and fluidity was determined, and the optimal ratio of the filling slurry was obtained. Experimental results show that the microcosmic morphology of coal gangue, desulfurization gypsum, and gasification slag presents an irregular block and rough particle surface; the microcosmic morphology of fly ash and bottom slag presents first out spherical or quasi spherical particles. Moreover, obvious sintering traces exist on the surface of the bottom slag. The main crystal mineral of coal gangue and fly ash is SiO 2 , the desulfurization gypsum is composed of Ca(SO 4 ) (H 2 O) and Ca(CO 3 ) crystal minerals, the gasification slag is composed of carbon and nitrogen compounds, and the main crystal mineral components in the bottom slag sample are SiO 2 and Al x Si y O z compounds. The order of significance of each key factor on slurry fluidity is as follows: C (desulfurization gypsum) > D (gasification slag and bottom slag 1:1) > A (coal gangue) > B (fly ash). The order of the significance of each key factor on slurry bleeding is as follows: B (fly ash) > C (desulfurization gypsum) > D (gasification slag and bottom slag 1:1) > A (coal gangue). Considering the material preparation, field application, and other conditions, the mass percentage of each factor content of the new paste filling material is as follows: 49.5% coal gangue, 8.3% fly ash, 4.1% desulfurization gypsum, 6.2% gasification slag, and 6.2% bottom slag.

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“…At present, the major object of research on grouting sealing materials is cement-based sealing materials. In terms of relevant research on slurry materials, primary consideration is given to the influence of slurry properties on bearing capacity and durability (Ge et al, 2014;Di et al, 2021;Guo et al, 2021). In order to utilize coal resources efficiently, scholars use coal debris as slurry material, on the ground of cement-based sealing materials, the addition of a certain concentration of coal fly ash.…”

Section: Introductionmentioning

confidence: 99%

Study on the test of coal mass fracture grouting sealing with coal-based materials and its application

Ying-jun

Yao²,

Zhang³

et al. 2023

Front. Earth Sci.

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This study is focused on coal mass fracture grouting sealing and seepage reduction with coal-based grouting sealing materials. First, a new type of coal-based grouting sealing materials was developed and applied to the fractured coal sample in the grouting test. Then, the coal sample before and after grouting was scanned and reconstructed with the aid of industrial computed tomography (CT). Based on CT images and reconstructed data, a theoretical model of grouting sealing for fractured coal mass was constructed by taking the migration and sedimentation of grouting slurry particles into consideration. Furthermore, on the ground of the theoretical model, a numerical calculation model of grouting sealing for the fractured coal sample was established, and the mechanism of grouting sealing and seepage reduction with coal-based sealing materials was simulated. Finally, a field test of gas extraction drilling and sealing was performed using the coal-based grouting sealing technology. The results show that: 1) The new type of coal-based grouting materials is effective in sealing the coal mass fracture, as the fracture is tightly filled with slurry particles after grouting. 2) The numerical simulation reproduces the whole process of grouting slurry flow and fracture sealing. After the permeability of the grouting coal sample decreases rapidly, it gradually tends to stabilize. The permeability of the whole coal sample goes down by 96% on average, and that of the fracture drops by more than 99.9% on average. The law of slurry diffusion and permeability variation calculated by numerical simulation is in line with the test results, which verifies the reasonableness of the model. 3) The application of the coal-based grouting sealing technology achieves an excellent sealing effect, promoting the gas extraction concentration by 1.43 times. The research results provide guidance for revealing mechanism of coal mass fracture grouting sealing with coal-based materials and bolstering the effect of extraction borehole sealing.

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Experimental Research on Performance of New Gas Drainage Borehole Sealing Material with High Fluidity

Cited by 5 publications

References 16 publications

Development and Application of Water Sealing Technology for Gas Drainage Boreholes

Development and Application of Water Sealing Technology for Gas Drainage Boreholes

Fluidity Influencing Factor Analysis and Ratio Optimization of New Filling Slurry Based on the Response Surface Method

Study on the test of coal mass fracture grouting sealing with coal-based materials and its application

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