Development and Engineering Practice of Multi-point Closed Sampling Device for Coal Mine Underground Drilling
DU Kun
GUO Kunming
Abstract：A single hole multi-point closed drilling device was proposed to improve the efficiency and accuracy of gas content determination in coal mines,in response to the problems of traditional coal sampling methods that require multiple stops,withdrawals,and sampling,resulting in long operation cycles,susceptibility to external environmental influences,gas leakage,and difficulty in ensuring the accuracy of gas parameter measurement results.To solve the above problems,a sampling device with multi-point sampling while drilling and high sealing performance was designed.Through the collaborative effect of a pressure type telescopic rotating mechanism and a sealing structure,multi-point sampling of coal seams was achieved during the drilling process,ensuring the sealing of the coal sampling process.The laboratory testing and underground industrial test verification results showed that the pressure change of the sampling inner cylinder within 24 hours did not exceed 5％,the accuracy of gas parameter determination was improved by more than 4％,and the operation cycle was shortened by more than 1.3 times.Its sampling accuracy and data reliability are better than traditional sampling methods.The device realizes the function of multi-point closed sampling while drilling,significantly shortens the traditional sampling time,improves the timeliness of gas content determination,and realizes the innovation of underground gas determination methods in coal mines.
Keywords：closed sampling devicemultiple-points during drillinggas content determinationintegrated drilling and extraction
Publication Date：2025-04-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 18-22,32 )