【作者】 陈沛沛；

【导师】 王瑞和；

【作者基本信息】 中国石油大学 ， 油气井工程， 2007， 硕士

【摘要】 随钻测量（MWD）是获得井下信息的最重要技术手段，而利用泥浆压力连续波传输井下数据是随钻测量技术的新方法。论文通过分析与研究声波、电磁波和泥浆脉冲等无线传输方式，认为泥浆脉冲传输方式具有良好的应用前景。相对于泥浆压力正脉冲、负脉冲，连续波传输方式抗干扰能力强、传输速率高，更加适合于深井钻进和机械钻速较低的场合。因而，论文研究了基于连续波传输方式的井下信号编、解码方法及调制技术，并制定了通信协议。首先，通过研究传输速率、差错率、可靠性、信噪比等衡量信号传输质量的重要指标，结合钻井作业的工况，着重从信息传输的可靠性方面考虑，设计出了具有差错控制能力的（23，12）戈莱码井下信号编码方法。同时，根据编、译码原理提出了修正补错译码方法，对戈莱码进行解码。而且，本文设计了相应的编、解码电路。其次，通过推导、分析调制信号的空间数学模型，发现若采用绝对调相技术对编码进行调制，会出现相位模糊问题，故本文采用二进制差分调相法，并指出调制信号可在井口采用差分相干解调方法进行解调。另外，论文通过研究串行的数据传输方式，具体分析井下通信设备模块的结构和功能，制定了它们之间通信的总线标准和通信协议。更多还原

【Abstract】 MWD is the most important technique for down hole data acquisition,and using mud pressure continuous wave to transmit data is a new method.Through the analysis and studies on some modes of wirelesstransmission as acoustic wave, electromagnetic wave and mud pulse, the mudpulse has bright future for application. Continuous wave transmission hasstrong anti-interference ability, high transmitting rate and is fit for deep welldrilling and the low ROP situation compared to positive and negative impulseof mud pressure. The paper presents the study on encode and decode methodand modulate techniques based on continuous wave transmission. Accordingto some key parameters for signal transmission quality measurement astransmission rate, error rate, dependability, signal-to-noise ratio andemphasized on the aspect of data transmission dependability, with theconsideration of drilling condition, the Golay code down hole encode methodwhich has error control ability has been designed. The Golay code wasdecoded by the method for amending error code which has been proposedwith the encode-decode rules and the encode-decode electrical circuit isshowed in this paper. Second, it was fund that the phase ambiguity problemcould be exist when the code is decoded only by using absolute phase modulation techniques through derivation, analysis on space mathematicalmodel of modulation signal, so the paper indicates that modulation signalscan be demodulated in well surface with differential coherent detectionmethod. In addition, according to the study on serial data transmission style,the paper also presents the analysis on structure and function of down holecommunication apparatus, the constitution of bus standard andcommunication protocol between them.更多还原