Analysis of Internal Acoustic Signal Transmission in Gas Drilling Strings

doi:10.11885/j.issn.16745086.2016.03.11.05

Abstract

Abstract: Concerning the problem of gas drilling measurement, a method for gas drilling using internal acoustic signal transmission in a gas drilling string was proposed with reference to the working principle of a medical stethoscope. By constructing a mathematical model and determining the solution for the sound wave propagation in the gas drilling string, the pattern of the acoustic signal transmission attenuation was derived. The waveguide characteristics of the gas drilling string were analyzed using acoustic theory, and the cutoff frequency of the sound waves in the gas drilling string was calculated. Through pipeline acoustic transmission experiments, the collected acoustic signals were compared with the calculated results to verify the accuracy of the theoretical analysis. The results showed that the degree of attenuation during the internal acoustic signal transmission in the gas drilling strings gradually intensified as the frequency increased. The inner diameter of the gas drilling string determined the cutoff frequency of the sound waves in each internal segment, with larger inner diameters resulting in lower cutoff frequencies. When selecting acoustic signal transmission carrier frequencies, care should be taken to select the cutoff frequencies of the gas drilling string as low as possible according to the pattern of the attenuation of the internal acoustic signals in the gas drilling strings and the waveguide characteristics of drilling strings with different sizes, to reduce the attenuation caused by the higher-order shock waves and extend the transmission distance of the acoustic signals.

Key words: gas drilling, acoustic signals, waveguide characteristics, cutoff frequency, carrier frequency

CLC Number:

TE243

MA Xiao, MENG Yingfeng, CHEN Yijian, CHEN Qiushi. Analysis of Internal Acoustic Signal Transmission in Gas Drilling Strings[J]. 西南石油大学学报(自然科学版), 2017, 39(5): 129-136.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.16745086.2016.03.11.05

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2017/V39/I5/129

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