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Modeling and measurement of microwave propagation multipath channels in drill pipe bore

Published online by Cambridge University Press:  28 September 2018

Xia Wenhe Open the ORCID record for Xia Wenhe [Opens in a new window] ,
Guan Wenting ,
Jiang Zujun ,
Meng Yingfeng  and
Tang Bo
Xia Wenhe*
Affiliation:
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, China School of Electrical Engineering and Information, Southwest Petroleum University, Chengdu, China
Guan Wenting
Affiliation:
Engineering Technology Research Institute, Petrochina Southwest Oil & Gasfield Company, Chengdu, China
Jiang Zujun
Affiliation:
Petroleum Engineering Technology Research Institute, Southwest Oil & Gas Branch, Sinopec, China
Meng Yingfeng
Affiliation:
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, China
Tang Bo
Affiliation:
Drilling Technology Research Institute of Shengli Petroleum Engineering Corporation Limited, Sinopec, China
*
Author for correspondence: Wenhe Xia, E-mail: [email protected]
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Abstract

In this paper, the characteristics of microwave propagation channels in drill pipe bore are analyzed by regarding the drill pipe as an irregular lossy cylindrical waveguide. An attenuation law is modeled using multipath propagation theory and an experimental statistical method. It is shown from physical measurement results that 5″ and $5^{1/2 \prime \prime} $ drill pipe bores, widely applied in the field of air drilling, can be used as 2.4 GHz band microwave channels with the caveat that the numerous reflective surfaces in the joint section of the drill pipe produce a great deal of reflected waves. Hence, the drill pipe bore has the characteristics of a dual cluster multipath channel, and multipath fading and delay are the primary factors affecting propagation quality. The study's constructed microwave attenuation model, based on multipath channels, can be regarded as the average attenuation of the unit length in the drill pipe bore, and can be used as the basis for simulation and analysis of the longer drill pipe string. In addition, a large delay between the two clusters leads to a significant increase of the root mean square delay spread. Consequently, multipath fading and delay are the main factors affecting the channel transmission rate.

Keywords

Double cluster multipath channelmicrowave attenuation model in drill pipe boremicrowave measurement while drillingultra long irregular lossy cylindrical waveguide
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 11 , Issue 3 , April 2019 , pp. 220 - 226
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2018 

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