高速泥浆脉冲遥传系统研制及应用

Development and Application of High-speed Mud Pulse Signal Transmission System

针对正脉冲式泥浆脉冲发生器传输速率低(1 bit/s),不能满足实时地质导向和实时地层评价的问题,介绍了一种高速泥浆脉冲遥传系统。通过理论分析、仿真模拟计算及试验,确定在系统中采用旋转阀式脉冲发生器的井下信号发生系统,以进一步提高传输速率和泥浆适应性;针对地面系统高速泥浆脉冲信号被噪声淹没等问题,采用通过高速信号采集处理系统,基于自适应滤波、位同步解码等算法,对采集到的原始信号进行了滤波解码处理;另外,通过现场应用对系统存在的其他问题进行了升级改进。现场应用表明,该系统具有泥浆适应性好、传输速率高(3~5 bit/s)等优点。

The transmission rate of positive pulse mud pulse generator is low(1 bit/s),which can not meet the requirements of real-time geological guidance and real-time formation evaluation.In order to solve the problem,a high-speed mud pulse signal transmission system is introduced.Through theoretical analysis,simulation calculation and test,the downhole signal generation system with rotary valve pulse generator is adopted in the system,which further improves the transmission rate and mud adaptability.For the problem that the high-speed mud pulse signal of the ground system is submerged by noise,the original signal is filtered and decoded by the high-speed signal acquisition and processing system based on adaptive filtering,bit synchronous decoding and other algorithms.Through the field application,the existing problems of the system are improved.The field application shows that the system has good mud adaptability and high transmission rate(3~5 bit/s).