Abstract
AS the highly conductive complex environment of tubing, casing, packers and formation water in annulus, for the carrier of the wireless electromagnetic telemetry systems in production wells, only the super-low frequency band can be selected. In the previous work, we have verified that the convolutional neural network (CNN) method is effective for demodulating the super-low frequency BFSK signal mixed with Gaussian white noise in an ideal channel without considering the clutter and phase offsets. Due to the complex structure and high-loss medium environment, the down-hole annulus wireless electromagnetic channel will contain interference that introduces other frequency components, and there is also a phenomenon of carrier phase shift. Based on the previous work, this paper introduces the interference wave and carrier phase shift of other frequency components into the received signal. The feasibility study of the BFSK signal demodulation of wireless electromagnetic remote transmission system in complex down-hole environment using CNN method was carried out. The results show that the CNN also has a good demodulation effect for the super-low frequency BFSK modulated signal of down-hole annulus complex channel. The results of this study provide a strong theoretical support for understanding the signal characteristics of wireless electromagnetic remote transmission (EM-WRT) and developing the wireless electromagnetic telemetry system in the down-hole complex environment.
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Acknowledgments
The project is supported by High-tech project of Sichuan Provincial Science and Technology Department (2020YFG0182), Sichuan Provincial Work Safety Supervision and Administration Project on Safe Production Technology (sichuan-0004-2016AQ), Science and Technology Project of China Petroleum Exploration and Development Research Institute (RIPED.CN-2019-CL-53).
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Lin, L., Li, Wq., Peng, M., Tan, Hf., Wei, Ga., Xu, J. (2021). Feasibility Study on Demodulation of Down-Hole EM-WRT Considering Clutter and Carrier Phase Shift Based on CNN. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2020. IFEDC 2020. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-0761-5_270
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DOI: https://doi.org/10.1007/978-981-16-0761-5_270
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