Signal Transmission Capability Improvement of a Telemetry Drill String Using the Reflected Signal at the Transmission Line Termination

Jia Jia; Su Yinao; Shen YueHu GaixingZhang LingtanSheng Limin

首页> 外文期刊>Mathematical Problems in Engineering: Theory, Methods and Applications >Signal Transmission Capability Improvement of a Telemetry Drill String Using the Reflected Signal at the Transmission Line Termination

【24h】

Signal Transmission Capability Improvement of a Telemetry Drill String Using the Reflected Signal at the Transmission Line Termination

机译：Signal Transmission Capability Improvement of a Telemetry Drill String Using the Reflected Signal at the Transmission Line Termination

获取原文

获取原文并翻译 | 示例

掌桥外文数据库（机构版） >>

开具论文收录证明 >>

文献代查 >>

页面导航

摘要
著录项
相关主题

摘要

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.

著录项

来源
《Mathematical Problems in Engineering: Theory, Methods and Applications》 |2020年第41期|7391530.1-7391530.11|共11页
作者
Jia Jia; Su Yinao; Shen YueHu GaixingZhang LingtanSheng Limin;
展开▼
作者单位

PetroChina Changqing Oilfield Co, Oil & Gas Technol Inst, Xian 710018, Peoples R China;

China Univ Petr East China, Coll Sci, Qingdao 266580, Peoples R China;

CNPC Engn Technol R&D Co Ltd, Beijing 102206, Peoples R ChinaChina Univ Petr East China, Sch Petr Engn, Qingdao 266580, Peoples R ChinaChina Univ Petr East China, Sch Petr Engn, Qingdao 266580, Peoples R China|CNPC Engn Technol R&D Co Ltd, Beijing 102206, Peoples R China;

展开▼
收录信息
原文格式 PDF
正文语种英语
中图分类
关键词

Signal Transmission Capability Improvement of a Telemetry Drill String Using the Reflected Signal at the Transmission Line Termination

摘要

著录项

相关主题

期刊订阅