Laboratory characterization of coal P-wave velocity variation during adsorption of methane under tri-axial stress condition

Zhu, Shuwei; Zhou, Fang; Kang, Jianhong; Wang, Youpai; Li, Haijian; Li, Guanghua

doi:10.1016/j.fuel.2020.117698

Cited by 9 publications

(1 citation statement)

References 39 publications

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“…The wave velocity of sedimentary rocks range from 1500 m/s to 6000 m/s. P-wave velocity of coal rock is affected by effective stress, pore pressure and so on [39]. According to laboratory studies results, P-wave velocity of coal rock is varied from 1000 m/s to 2500 m/s.…”

Section: Influence Of P-wave Velocitymentioning

confidence: 99%

Joint position method of coal mines methane extraction borehole trajectory by fusing micro-seismic signal and MWD

2024

AJAGE

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Drilling hole wellbore trajectory measurement is important to coal mine gas management. Current trajectory measurement technology is magnetic surveys, which adopt three-axis accelerometers (inclinometers) and magnetometers to calculate the inclination and azimuth. However, this method is easy to be affected by magnetic minerals in coal mine. This paper proposed joint position method of drilling hole using micro-seismic events of drill breaking rock and MWD (Measure While Drilling) data. This paper establishes propagation model of micro-seismic signals in rock fragmentation. Micro-seismic events pick method adopts STA/LTA (Short Term Average/Long Term Average) and AIC (Akaike Information Criterion). Micro-seismic inversion position adopts newton iteration method. Location error of micro-seismic position method is analysed influence by P-wave velocity, SNR (Signal-to-Noise Ratio), sampling frequency in horizontal and vertical direction. Trajectory calculation method using MWD data adopt Average Angle Method and Minimum Curvature Method. Hole bottom location error of two trajectory calculation methods is analysed in horizontal and vertical direction. Based on error analysis of micro-seismic location method and hole trajectory calculation method, this paper proposed two new joint location methods using Kalman filtering and weight method. According to simulate results, the precision of weight method data fusion method is better than Kalman filter method in the all direction. Ideally, the positioning accuracy of the bottom of the drilled hole can be controlled within 1m, whose depth of drilling hole is about 500m. According simulate results, proposed method can effectively improve the positioning accuracy of borehole bottom. Research results in this paper provide a theoretical reference for the boreholes trajectory measurement and calculation for coal mines.

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Section: Influence Of P-wave Velocitymentioning

confidence: 99%

Joint position method of coal mines methane extraction borehole trajectory by fusing micro-seismic signal and MWD

2024

AJAGE

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An Investigation on the Bursting Liability of Oxidized Coal and the Coupling Mechanism of Rock Burst and Spontaneous Combustion

Pan

et al. 2021

Rock Mech Rock Eng

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An equivalent medium model of stress wave propagation through a three-dimensional geo-stressed rock

Jin

Guo

et al. 2022

Arab J Geosci

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Laboratory characterization of coal P-wave velocity variation during adsorption of methane under tri-axial stress condition

Cited by 9 publications

References 39 publications

Joint position method of coal mines methane extraction borehole trajectory by fusing micro-seismic signal and MWD

Joint position method of coal mines methane extraction borehole trajectory by fusing micro-seismic signal and MWD

An Investigation on the Bursting Liability of Oxidized Coal and the Coupling Mechanism of Rock Burst and Spontaneous Combustion

An equivalent medium model of stress wave propagation through a three-dimensional geo-stressed rock

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