Abstract
In consideration of high transmission rate and high reliability of the coiled tubing drilling measuring instrument, through comparison with the MIL- STD-1553B bus protocol, we proposed a modified CAN version to improve the CAN bus as data transmission scheme for underground communication bus. Com- paring the 1553 bus with CAN bus in terms of their basic principles, characteristics and formats of data, the feasibility of CAN bus as underground transmission bus is analyzed. In order to meet the demand of small size coiled tubing instrument, the design of CAN bus controller based on FPGA technology and the improvement of CAN bus protocol are put to enhance the stability and reliability of the CAN bus protocol, meeting the requirements of the measurement while drilling. The mod- ified CAN controller, which is the middle link of downhole instrumentation and telemetry gauge, is equipped with high reliability and scalability.
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