Research on acoustic NCOFDM transmission and noise reduction for logging while drilling data

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Research on acoustic NCOFDM transmission and noise reduction for logging while drilling data
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                        Ma DongMa Dong
1.School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China; 2. Center for Information Geoscience, University of Electronic Science and Technology of China, Chengdu 611731, China
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Shi YibingShi Yibing
1.School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China; 2. Center for Information Geoscience, University of Electronic Science and Technology of China, Chengdu 611731, China
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Zhang WeiZhang Wei
1.School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China; 2. Center for Information Geoscience, University of Electronic Science and Technology of China, Chengdu 611731, China
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Liu GuozhenLiu Guozhen
1.School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China; 2. Center for Information Geoscience, University of Electronic Science and Technology of China, Chengdu 611731, China
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Affiliation:1.School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China; 2. Center for Information Geoscience, University of Electronic Science and Technology of China, Chengdu 611731, China
Clc Number:TH701
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Abstract:

With the rapid development of logging while drilling (LWD) technology, the realtime transmission of multidimensional formation data is particularly important. Aiming at improving the low data rate, high cost, and nonreal time for traditional transmission approaches, this paper proposes a novel acoustic transmission scheme based on noncontinuous orthogonal frequency division multiplexing (NCOFDM). Firstly, the frequency response function of drill strings channel is simulated through transfer matrix method (TMM), and on this basis, a channel estimation method is proposed to obtain frequency response of each subchannel. Then, a received array with two accelerometers is utilized to receive the acoustic signals with phase shifting, and the surface strong noise interference of uplink transmission can be reduced through the correlation of the received signals. Finally, a set of test device of communication is designed to validate the transmission performance under the channel condition of experimental drill strings. Simulation and test results show that the designed transmission scheme has high data rate and high reliability.

Key words:logging while drilling (LWD); noncontinuous orthogonal frequency division multiplexing (NCOFDM); transfer matrix method (TMM); channel estimation; noise interference

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Online: July 20,2017
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