Orthogonal frequency division multiplexing while drilling data transmission method, system, storage medium and application

Abstract

The invention belongs to the technical field of petroleum exploration, and discloses an OFDM data transmission method, system, storage medium and application. At the sending end, the signal processor performs signal modulation on the data after error control encoding, and passes through After the fast discrete Fourier inverse transform, add a cyclic prefix and perform digital-to-analog conversion; the low-frequency radio frequency circuit performs power amplification after the analog signal is up-converted, and the sending transducer converts the power-amplified electrical signal into an acoustic signal in the drilling fluid channel Transmission; at the receiving end, the receiving transducer converts the received acoustic signal into an electrical signal, after matched filtering and down-conversion, data synchronization and fast discrete Fourier transform are performed, and the output complex vector is demapped into bits data and decompose the structure. The invention improves the data transmission rate, reduces the bit error rate, effectively overcomes the intersymbol interference, improves the spectrum utilization rate, and realizes high-speed downhole communication.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration, and in particular relates to an OFDM data transmission method, system, storage medium and application while drilling. Background technique [0002] At present, drilling is the most risky link in the process of oilfield exploration and development. During the drilling process, petroleum geological engineers should obtain enough information and data from the downhole in time to monitor the downhole environment. At present, the most widely used drilling data transmission systems mainly include mud pulse and electromagnetic wave. Mud pulse and electromagnetic wave technologies are very mature and widely used in the field of downhole data transmission. However, due to limited bandwidth and large attenuation, the transmission rate of these methods is relatively low, and the maximum transmission rate does not exceed 40 bits per second. The problems of slow downhole data upload rate, long...

AI Technical Summary

Problems solved by technology

Due to the constraints of bandwidth and other factors, neither of these two methods can be integrated with advanced communication technologies with high transmission rates and low communication errors.

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