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Academic Journal of Architecture and Geotechnical Engineering, 2024, 6(2); doi: 10.25236/AJAGE.2024.060210.

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


Tao Wang1, Xuelian Dong2, Lili Yan1, Lusi Chen2, Ziwei Tian3, Jingwu Zhou4

Corresponding Author:
Xuelian Dong

1Safety Technology Centre, Sichuan Coal Mine Safety Administration, Chengdu, China

2State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, China

3Sichuan Hengsheng Shengrui Survey and Design Co., LTD, Chengdu, China

4CCDC Drilling and Production Engineering Technology Research Institute, Guanghan, China


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.


Coal mines; gas extraction borehole; trajectory measurement; data fusion; Kalman filtering; weight method

Cite This Paper

Tao Wang, Xuelian Dong, Lili Yan, Lusi Chen, Ziwei Tian, Jingwu Zhou. Joint position method of coal mines methane extraction borehole trajectory by fusing micro-seismic signal and MWD. Academic Journal of Architecture and Geotechnical Engineering (2024) Vol. 6, Issue 2: 51-64. https://doi.org/10.25236/AJAGE.2024.060210.


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