Measurement of overburden failure zones in close-multiple coal seams mining

Yang, Li; Ren, Yuqi; Peng, Syd S.; Cheng, Haozhou; Wang, Nan; Luo, Jun

doi:10.1016/j.ijmst.2020.12.009

Cited by 32 publications

(11 citation statements)

References 1 publication

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“…Many fractures have formed in coal after the long-term geological process, which significantly influences coal seam gas (CSG) development [1,2]. Multiple scale fractures have been investigated, ranging from nanoscale to field scale with hundreds of meters [3][4][5][6]. Microscale fracture analysis is mainly based on focused ion beam scanning electron microscopy (FIB-SEM) [7], scanning electron microscopy (SEM) [8], nuclear magnetic resonance (NMR) [9], X-ray micro-computed tomography (Micro-CT) [10].…”

Section: Introductionmentioning

confidence: 99%

An Integrated Approach of Numerical Well Test for Well Intersecting Fractures Based on FMI Image

Jin

Xing

et al. 2022

Lithosphere

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Fluid flow is strongly affected by fractures in unconventional reservoirs. It is essential to deeply understand the flow characteristics with fractures for improving the production and efficiency of unconventional reservoir exploitation. The purpose of this work is to develop an accurate numerical model to evaluate the transient-pressure response for well intersecting fractures. The meshes generated from Fullbore Formation Micro-Imager (FMI) images ensure an efficient numerical description of the geometries for fractures and interlayers. The numerical simulation is implemented by an inhouse finite element method-based code and benchmarked with drill stem test (DST) data. The results show that three flow regimes appear in the reservoir with fractures within the test period: wellbore afterflow, pseudolinear flow, and radial flow. In contrast, only the wellbore afterflow and radial flow appear for the wells without fractures. The results also reveal that fractures dominate the flow near the wellbore. Verification and application of the model show the practicability of the integrated approach for investigating the transient-pressure behaviors in the unconventional reservoir.

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Section: Introductionmentioning

confidence: 99%

An Integrated Approach of Numerical Well Test for Well Intersecting Fractures Based on FMI Image

Jin

Xing

et al. 2022

Lithosphere

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“…Coal seam groups are widely distributed in mining areas of different regions in China, especially closely spaced coal seam groups (Wang et al 2013). Selecting a coal seam with the optimal reliability factor as the first mining seam is necessary to achieve safe and high-efficiency mining due to the diversified conditions of coal seams during mining (Wang et al 2017;Li et al 2021;Wu et al 2018). Reasonable selection of the first mining seam not only contributes to realizing orderly gas draining-tunneling-mining planning but can also reduce or eliminate the risk of gas outbursts, which is of great significance for realizing safe production.…”

Section: Introductionmentioning

confidence: 99%

A method for selection rationality evaluation of the first-mining seam in multi-seam mining

Zou

Zhang

Cheng

et al. 2021

Geomech. Geophys. Geo-energ. Geo-resour.

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The reasonable selection of the first mining seam in coal seam group is of critical importance for the effective prevention and control of gas disasters during coal mining. At present, the selection of the first seam in a coal seam group is generally based on site conditions and professional experience, which results in a degree of blindness. Therefore, a rationality evaluation system for the selection of the first mining seam is needed to guide the operation of the site, which can guarantee the safety of coal mining. To address this issue, a method for evaluating the rationality of selecting the first mining seam was proposed in this paper. The method provides comprehensive, scientific and reliable theoretical guidance for the selection of the first mining seam when mining coal seam groups by combining the expert evaluation method with the entropy method. At the same time, the reliability of the method was verified through the case study at the Shihao Coal Mine in Chongqing, China. In summary, the method eliminates the blindness in selecting the first mining seam when mining coal seam group and provides theoretical guidance for coal seam group mining operations. Article Highlights• A method for selection rationality evaluation of the first-mining seam in multi-seam mining was proposed. • An evaluation index system of the first mining seam in outburst-prone mines was established. • The effectiveness of the evaluation method was verified.

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“…In China, due to the disorder and over boundary mining of small coal mines, many anfractuous abandoned roadways (ARs) were left in coal seams [1][2][3][4][5]. A large danger of safety and efficiency would happen when the longwall mining panel face passes through the ARs.…”

Section: Introductionmentioning

confidence: 99%

A Novel Mining Method for Longwall Panel Face Passing through Parallel Abandoned Roadways

Yang

Ren

Wang

et al. 2021

Shock and Vibration

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Mining pressure behavior in the process of longwall panel face passing through the parallel abandoned roadways (PARs) is different from the ordinary longwall panel face. It is easy to induce the accident of roof falling, coal wall spalling, and crush accident of shield. In order to reduce the occurrence of mine pressure accidents and ensure safe mining, a new mining method named “swing-inclined” mining method was proposed and was employed in the E13103 of Cuijiazhai coal mine. Based on the process of the longwall panel face passing through the PARs, a long-span and multisupport mass-structure model of the roof was established. The maximum support capacity of shield was calculated combined with stability relation between “roof-shield-PAR-‘similar pillar (SP)’-coal wall.” It provided the basis for determining the reasonable support capacity of shield. Moreover, the sensitivity analysis of influenced factors to the maximum support capacity of shield was carried out by using Matlab software. The sensitivity analysis results indicated that different factors had a different effect on the support capacity of shield. And, the process of passing through the PARs can be divided into 3 stages, depending on the relation between support capacity of shield and width of SP. In different stages, the change degree of support capacity of shield was different. The support capacity of shield is mainly influenced by the hanging distance of the main roof and the horizontal distance between the support point of the coal wall and the breaking position of the main roof. By on-site measurement, the sensitivity analysis results were verified.

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Measurement of overburden failure zones in close-multiple coal seams mining

Cited by 32 publications

References 1 publication

An Integrated Approach of Numerical Well Test for Well Intersecting Fractures Based on FMI Image

An Integrated Approach of Numerical Well Test for Well Intersecting Fractures Based on FMI Image

A method for selection rationality evaluation of the first-mining seam in multi-seam mining

A Novel Mining Method for Longwall Panel Face Passing through Parallel Abandoned Roadways

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