期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：237
期号：3
页码：032121
DOI：10.1088/1755-1315/237/3/032121
出版社：IOP Publishing
摘要：In the drilling process, the purpose of using the wireless measurement while drilling system is to transmit the data measured by instrument in the hole to the ground in real time, the mud is used as the medium for transmitting data, the coding and controlling technologies are the core of the system. Firstly, according to the encoding rules, the data are encoded by the optimized combined coding technique and then are transmitted in a time-frame manner, each time frame is divided into n time-slots; secondly, the singlechip microcomputer is used to control pulse signal generator generate m pulses in different time-slots, the different data can be represented; thirdly, on the ground, the technical staff use pressure sensor to collect pulse signals, analyze them, and restore the data to provide a basis for drilling. The wireless measurement while drilling system based on the optimized combination of coding and controlling technologies has been used in the industrial test of ground directional drilling grouting for water hazard regional control of coal seam floor in Xin'an Coal Mine, the results show that the technologies have strong anti-interference ability, high measurement accuracy, simple operation and easy implementation.
