Solving the problem of data transmission while drilling based on underwater acoustic communication principle

被引：1
|
作者：
Geng Y. [1 ]
Jia M. [1 ]
Zheng Z. [1 ]
Yan H. [1 ,2 ]
Yue Y. [1 ,3 ]
Li F. [1 ]
机构：
[1] College of Control Science and Engineering in China University of Petroleum (East China), Qingdao
[2] Key Laboratory of Drilling Rigs Controlling Technique of Shaanxi Province, Xi'an Shiyou University, Xi'an
[3] College of Automation and Electronic Engineering, Qingdao University of Science and Technology, Qingdao
来源：
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2020年 / 44卷 / 01期
关键词：
Acoustic transducer; Measurement while drilling; Mud channel; Phased array; Underwater acoustic data transmission;
D O I：
10.3969/j.issn.1673-5005.2020.01.006
中图分类号：
学科分类号：
摘要：
After a brief introduction of measurement-while-drilling (MWD) and available wireless MWD technology, a new proposal was put forward to solve the problems of high-speed data transmission while drilling based on underwater acoustic communication principles. Firstly, drilling fluid in the pipe was selected as the communication channel, which was simplified to a one-dimensional, finite length, uniform, equal section waveguide. Based on the basic equation for small amplitude waves of ideal fluid, several properties of the channel were discussed, including the cut-off frequency of mud channel, the effect of viscous force and nonlinear factors.This lays a foundation for the parameters determination of MWD system, such as acoustic carrier frequency, required power and attainable distance. A proposal of creating a piecewise, time-varying, distributed model for real-time channel was then presented to simulate the channel properties of data transmission, which adapts to variations of drilling fluid channel, such as the increase of drilling depth, the variation and displacement of fluid density and viscosity with increasing borehole temperature and pressure.. Thirdly the attenuation results of acoustic signal in mud channel with water-based and oil-based drilling fluid were calculated, and the methods of enhancing acoustic source power and improving sink detection sensitivity based on phased array were explained. All of the results show that this proposal is feasible, and a breakthrough of MWD technology is expected to be made which solves the problem of MWD thoroughly. The optional low frequency limit is greater than 2 kHz based on the existing drilling engineering parameters, far beyond the range of process noise and therefore favorable for useful signal extraction. This makes the minimum communication requirement and makes it possible for drilling longer than 3000 meters based on existing acoustic transducers and sensors. © 2020, Periodical Office of China University of Petroleum. All right reserved.
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页码：53 / 60
页数：7
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