The Research Of Microseismic Monitoring System In A Downhole For Coal Mine

At present, the microseismic monitoring is gained importance in the field of oil and mine.Microseismic monitoring is widely used in the coal mine to warn against rock burst.Microseismic monitoring system is mainly lay out in roadway of mining. There are large error location in vertical direction microseismic event. It can not meet the production needs.Therefore, how to improve the vertical positioning accuracy of microseismic monitoring is an urgent need to study.Based on existing microseismic monitoring system, construction of the three-dimensional model of the layered medium were builded. Select a ray tracing algorithm in the positive,improve ray tracing methods and enhance the positive algorithm computational efficiency and accuracy. Based on the classic Geiger localization algorithm, choose the location method of DIRECT algorithm. The method reduce the number of searches, accelerate the computational efficiency and get high precision.In order to meet the coal mine downhole microseismic monitoring requirements, develop a geophone with automatically pushed against the downhole, support the development of geophone installation technology. The monitoring system is designed. The development of microseismic monitoring station can be used in surface and underground. Surface monitoring station can use a wireless bridge to transfer microseismic data and solar power management solutions. This devise joint GPS and IEEE1588 synchronization together. This technology meet the demand in coal mine surface microseismic monitoring and downhole microseismic monitoring.Coal mine methane fracture monitoring and coal face floor failure microseismic monitoring verify the coal mine downhole microseismic monitoring reliability and high-precision data synchronization. The instrument is stable high positioning accuracy in the vertical direction.