Wireless MWD Continuous Wave Signal Transfer Model and Simulation

2013 Third International Conference on Instrumentation, Measurement, Computer, Communication and Control Pub Date : 2013-09-21 DOI:10.1109/IMCCC.2013.59

L. Jun, Yuan Feng

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引用次数: 4

Abstract

Through studying the transportation and vibration of drilling pressure fluctuation in drill stem, mathematical models between pressure flow and time distance are established, the differential equations corresponding to the above-mentioned variables are deduced and general solutions of differential equations are obtained. By analyzing the transferring mode of power transmission signals and describing the influence of drill stem on fluctuation through characteristic impedance and transmittance, the expression of frequency domain hydraulic head and frequency domain flow is given. Through model-simulation, pressure distribution of different signals along drill stem are calculated, which shows, in the process of transferring signals, the pressure wave of drill stem is in the form of standing waves. The influences of different signal terminal impedances and characteristic impedances on signal transfer are analyzed, simulation analysis of the signal of different frequency inside the drill stem is made, and the attenuations of different frequency inside the drill stem are obtained. Through calculating the natural frequency of drill stem, the methods for seeking out the apposite frequency of transmitted signal suitable for data transfer in the drilling stem, which theoretically supports the frequency selection of continuous-wave communication technology.

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无线随钻连续波信号传输模型与仿真

通过研究钻压波动在钻杆内的传递和振动，建立了压力流量与时间距离的数学模型，推导了上述变量所对应的微分方程，得到了微分方程的通解。通过分析动力传输信号的传递方式，通过特征阻抗和透射率描述钻杆对波动的影响，给出了频域水头和频域流量的表达式。通过模型仿真，计算了不同信号沿钻柱的压力分布，结果表明，在信号传递过程中，钻柱压力波呈驻波形式。分析了不同的信号终端阻抗和特征阻抗对信号传输的影响，对不同频率的信号在钻杆内进行了仿真分析，得到了钻杆内不同频率的衰减。通过计算钻杆的固有频率，寻找出适合于钻杆内数据传输的传输信号的合适频率的方法，为连续波通信技术的频率选择提供了理论支持。

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2013 Third International Conference on Instrumentation, Measurement, Computer, Communication and Control

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