Research on coal-rock interface identification technology based on measurement-while-drilling vibration signals
LI Heng
SUN Xiaoyu
Abstract：Aiming at the problem that gas drainage borehole trajectories are prone to deviate from coal seams,leading to reduced gas drainage efficiency and even potential safety hazards,this paper propo-ses a coal-rock interface identification technology based on measurement-while-drilling(MWD)vibra-tion parameters.This technology collects vibration signals during the drilling process,pre-processes them using wavelet transform and Butterworth filter,and extracts three characteristic parameters:average value,root mean square(RMS),and center frequency of power spectral density(PSD).By analyzing the differences in these three characteristic parameters at the coal-rock interface,a coal-rock interface identification model is established.Field test results show that the RMS value and the center frequency of PSD can effectively identify the coal-rock interface,providing a basis for real-time adjust-ment of the drilling trajectory.This technology has the advantages of low cost,fast response,and simple operation,which can provide a new solution for online monitoring of deviation in coal mine gas drainage boreholes.
Keywords：MWD vibrationcoal-rock interfacegas drainagehorizontal boreholefeature extraction
Publication Date：2025-08-10
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 61-65 )