Signal Transmission Capability Improvement of a Telemetry Drill String Using the Reflected Signal at the Transmission Line Termination
Joint Authors
Shen, Yue
Jia, Jia
Su, Yinao
Hu, Gaixing
Zhang, Lingtan
Sheng, Limin
Source
Mathematical Problems in Engineering
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-11-18
Country of Publication
Egypt
No. of Pages
11
Main Subjects
Abstract EN
A telemetry drill string system consists of a string of wired drill pipes, and high-frequency signals pass the adjacent drill pipes through inductive couplers.
Such a system is used to upload downhole information at high data transmission rates for measurements while drilling (MWD).
Since the signal energy attenuates greatly in the system, many repeaters must be provided to ensure signal transmission.
A reduction in the signal transmission in a telemetry drill string can extend the relay distance and improve the reliability of the transmission system.
In this study, the transmission characteristic of the rod of the wired drill pipe is studied using transmission line theory, and the transmission characteristic of the inductive coupler is studied using high-frequency circuit theory.
Using impedance matching between the transmission line of the rod and the inductive coupler, external impedance compensation elements, including a capacitor and a resistor, are recommended, and the electromagnetic parameters of the wired drill pipe are determined.
Based on the determined electromagnetic parameters, certain changes in the external impedance compensation capacitance and resistance can lead to impedance mismatch between the transmission line and the inductive coupler.
This will generate a reflected signal at the transmission line, and the vector superposes with the transmitted signal.
The terminal reflection coefficient of the transmission line is controlled by increasing the compensation resistance value to enhance the signal amplitude, which can compensate the transmission loss when passing through the inductive coupler to a certain extent.
Thus, the signal transmission capability of the telemetry drill string can be improved, allowing for long-distance signal transmission or drastically extending the relay distance, while maintaining a certain channel bandwidth.
American Psychological Association (APA)
Jia, Jia& Su, Yinao& Shen, Yue& Hu, Gaixing& Zhang, Lingtan& Sheng, Limin. 2020. Signal Transmission Capability Improvement of a Telemetry Drill String Using the Reflected Signal at the Transmission Line Termination. Mathematical Problems in Engineering،Vol. 2020, no. 2020, pp.1-11.
https://search.emarefa.net/detail/BIM-1197958
Modern Language Association (MLA)
Jia, Jia…[et al.]. Signal Transmission Capability Improvement of a Telemetry Drill String Using the Reflected Signal at the Transmission Line Termination. Mathematical Problems in Engineering No. 2020 (2020), pp.1-11.
https://search.emarefa.net/detail/BIM-1197958
American Medical Association (AMA)
Jia, Jia& Su, Yinao& Shen, Yue& Hu, Gaixing& Zhang, Lingtan& Sheng, Limin. Signal Transmission Capability Improvement of a Telemetry Drill String Using the Reflected Signal at the Transmission Line Termination. Mathematical Problems in Engineering. 2020. Vol. 2020, no. 2020, pp.1-11.
https://search.emarefa.net/detail/BIM-1197958
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1197958