油管声波传输特性机理及应用分析

The Tubing Sound Waves Mechanism of Transmission Feature and Application Analysis

为验证声波在油管中的传播特性,获取实际井况中声波传输的频率点或频段等问题.设计了现场试验方案,并利用先导井实测数据开展油管声波传输特性应用研究,探索了以油管为信道实现无线井筒控制技术的可行性.采用800 m油管为研究对象,通过理想的油管频率方程,分析了波数k与频率f曲线,群速度频率曲线等之间的关系.先导井中以常规的2^(7/8)油管为声波信道,进行声波传播特性测试.在不同声波频率下,分析了声波在油管中传播存在的梳状滤波器特性和色散现象,并获得了800 m油管中声波传播的频率点和频率范围.所实测的声波传输数据,也可为理想模型修正提供有效依据.

For verifying the sound wave propagation characteristic in pipeline and ideal frequency point or frequency band of sound wave propagation in realistic well condition,this paper proposed and designed the experimental scheme. At the same time,this paper studied the feasibility of wireless wellbore control technology based pipeline as channel through using the research of sound wave propagation characteristic in pipeline based measurement data of pilot hole. Meanwhile,this paper studied the relationship between the k（ wave number） and f（ frequency curve） or group velocity frequency curve through the ideal pipeline frequency equation based the 800 meters pipeline. In the pilot hole,conventional 27/8pipeline is used as the sound wave channel for making sound wave propagation characteristic testing. At the different sound wave frequencies,the comb filter characteristic and chromatic dispersion of sound wave propagation in pipeline are analyzed,and the frequency point and frequency domain of sound wave propagation in 800 meters pipeline are obtained. The measured data of sound wave propagation can provide the effective evidence for ideal model amendment.