With the continuous improvement of drilling intelligence,downhole and surface information transmission has become an important research topic in the field of drilling engineering,it plays a very im-portant role in measurement and control while drilling.Through the information transmission system,the information while drilling and geological parameters can be monitored in real time,and then the downhole actuator can be controlled in real time.This paper introduces the technical characteristics of acoustic trans-mission technology,electromagnetic transmission technology and mud pulse transmission technology,as well as the latest instrument achievements at home and abroad,and expounds the future development trend of each transmission technology.
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