Information transmission is an important part of the wellbore trajectory automatic control system. Combined with the characteristics of the guided drilling system, drilling fluid pulse is selected as a tool for trajectory control. Negative pulse transmission of drilling fluid is one of the key technologies to realize wellbore trajectory automatic control. In this paper, the working principle of negative pulse propagation of drilling fluid is introduced. The characteristics of negative pulse propagation and signal pretreatment of drilling fluid are analyzed emphatically. Signal correlation analysis method is proposed for signal transmission of drilling fluid negative impulse well. In this paper, the propagation characteristics of drilling fluid pressure pulsed downward transmission system are studied deeply. The influence of various drilling parameters on the drilling fluid pressure pulse is analyzed, and the model of drilling fluid pressure pulse is presented. Experimental results show that the proposed method can effectively separate useful signals from interfering signals. It is verified by field experiment that the success rate of information decode system designed by this method is high, which can meet the requirement of well trajectory precise control.

中文翻译：

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井眼轨迹控制的下行信息安全技术传输研究

信息传输是井眼轨迹自动控制系统的重要组成部分。结合导向钻井系统的特点，选择钻井液脉冲作为轨迹控制的工具。钻井液负脉冲传输是实现井眼轨迹自动控制的关键技术之一。介绍了钻井液负脉冲传播的工作原理。着重分析了钻井液负脉冲传播和信号预处理的特点。提出了钻井液负冲井信号传输的信号相关分析方法。本文对钻井液压力脉冲向下传输系统的传播特性进行了深入研究。分析了各种钻井参数对钻井液压力脉动的影响，建立了钻井液压力脉动模型。实验结果表明，该方法可以有效地将有用信号与干扰信号分离。现场实验证明，该方法设计的信息解码系统成功率较高，可以满足井眼轨迹精确控制的要求。