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

Abstract

The invention belongs to the technical field of oil exploration, and discloses an orthogonal frequency division multiplexing while-drilling data transmission method and system, a storage medium and anapplication. At a sending end, a signal processor performs signal modulation on data after error control coding, adds a cyclic prefix after inverse fast discrete Fourier transform, and performs digital-to-analog conversion; the low-frequency radio-frequency circuit performs up-conversion on the analog signal and then performs power amplification, and the transmitting transducer converts the electric signal after power amplification into a sound wave signal and transmits the sound wave signal in a drilling fluid channel; at a receiving end, a receiving transducer converts a received sound wavesignal into an electric signal, data synchronization and fast discrete Fourier transform are carried out after matched filtering and down-conversion, an output complex vector is demapped into bit data, and structure decomposition is carried out. According to the invention, the data transmission rate is improved, the bit error rate is reduced, the inter-symbol interference is effectively overcome,the spectrum utilization rate is improved, and the high-rate underground communication is realized.

Description

Technical field [0001] The invention belongs to the technical field of petroleum exploration, and particularly relates to an orthogonal frequency division multiplexing 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, the petroleum geological engineer must obtain enough information and data from the downhole in time to monitor the downhole environment. Currently, the most widely used drilling data transmission system mainly includes mud pulse and electromagnetic wave. Mud pulse and electromagnetic wave technology has been very mature and has been widely used in the field of downhole data transmission. However, due to the limiting factors such as limited bandwidth and large attenuation, the transmission rate of these methods is relatively low, and the maximum is not more than 40 bits per secon...

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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