Microwave propagation in air drilling

作     者：Meng Xiaofeng Chen Yijian Zhou Jing Meng Yingfeng Meng Xiaofeng 1 , Chen Yijian 2 , Zhou Jing 1 and Meng Yingfeng 2 1 Physics Department, Beijing Normal University, Beijing 100875, China 2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China

作者机构：Physics Department Beijing Normal University Beijing 100875 China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu Sichuan 610500 China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2010年第7卷第3期

页      面：390-396页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0810[工学-信息与通信工程] 082001[工学-油气井工程] 08[工学] 081002[工学-信号与信息处理] 

基　　金：Southwest Engineering Institute of Sinopec 

主　　题：Microwave waveguide drill-pipe casing air drilling 

摘      要：This paper examines the feasibility in air drilling of transmitting down-hole signals by using microwaves. Firstly the basic theory of microwave propagation in the drill-pipe or casing was studied, including power loss, cutoff wavelength, and dust scattering. Theoretical analysis indicates that the microwave propagation distance in a cb214mm casing can easily reach 5,000 m. When the effect of dust particles is taken into account, the propagation distance decreases to 2,000 m. We conducted both laboratory experiments and field tests in casings commonly used in oil fields. The field tests show that the effective propagation distance of microwave in the casing is about 1,300 m. The experimental results do not match well with theoretical prediction, but are acceptable. In future commercial applications, by applying multiple relay amplifiers, the microwave propagation distance could be long enough for most drilling wells.