Analysis reveales that currently data communication protocol on the drilling fluid channel and its architecture are more a lack of research, which to some extent, limit the research and development of drilling fluid communication system, and can not meet the requirements of the improvement of drilling technology. According to the unique characteristics of MWD channel, existing computer networks communication protocol and its architecture can not be directly used. In reference to the existing international standards, according to the characteristics of drilling fluid channel, a three-layer structure model for downlink data and a four-layer structure model for uplink data are prososed. Also the layered protocols and data flows corresponding to the models are designed. Simulation results show that the model is very suitable for the drilling fluid channel with low SNR level, can make the transmission more efficient, real-time and accurate, and is flexible and scalable.%分析发现目前国内外关于钻井液信道中数据通信协议及其体系结构的研究较为缺乏,这在一定程度上限制了钻井液通信系统的研究和发展,不能满足钻井工艺提高的要求.而且由于随钻测量系统信道独特的特征,不能直接套用现有的计算机网络通信中的协议及其体系结构.参照了现行的国际标准,根据钻井液信道的特点,设计了三层结构的数据下行通信模型和四层结构的数据上行通信模型,以及对应的分层协议和数据流.仿真结果表明,该模型非常适合低信噪比环境下的钻井液信道通信,能够提高随钻测量系统的传输效率、实时性和准确性,而且设置灵活、扩展性强.
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