Abstract
Mud pulse telemetry (MPT) is a low-cost borehole wireless communication scheme in the oil drilling industry. Drilling mud is used as the medium to deliver logging information via mud pressure pulses. However, the data transmission rate is severely limited by poor channel conditions. To overcome the existing limitations and to achieve the full potential of the MPT, a transmission model, which considers the effect of the boundary layer thickness on viscous friction and the effect of pipe materials on characteristic impedance, has been proposed. Then, the accuracy of the model is verified through experiments. Finally, the channel characteristics are analysed and discussed based on the model. The results demonstrate that the MPT channel is a time-varying multipath channel with significant symbol timing offsets, carrier frequency offsets, frequency selective fading, and inter-symbol interference issues. Based on the model simulation results, countermeasures are proposed.
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