摘要
基于钻柱信道的随钻数据声波传输方式能够满足现代钻井速度快、传输数据量大的要求,针对声波在钻柱中传播的问题,进行了声信号沿钻柱传输的信道特征以及声波通信的研究。根据波导理论,建立了声波沿钻柱传输的信道模型,声波在钻柱中传播,采用BPSK载波调制,为了克服BPSK载波在传输过程中相位偏移问题,运用自适应扩频通信系统模拟通信信道模型,自适应模拟跟踪信道特性,为正确地解调信号提供保障。实验结果表明:该方法可有效地实现数据沿钻柱高速传播,而且具有解码过程简单,误码率低、可靠性高等特点。在未来的深钻应用中,使声学遥测成为一种有效的传输方法来获取井下数据,实现更高速率的数据传输。
Using acoustic waves to transmit downhole information through the drill-string transmission channel is a promising approach that meets the requirements for the highspeed and large-volume data transmission in modem drilling. In the studies about acoustic signal transmission channel characteristics and acoustic communication, we developed a mathematical channel model for the description of a guided acoustic wave based on waveguide theory. To overcome the phase shift during trans- mission, we applied BPSKand adaptive spread-spectrum communication system to detecting the phase shift of carrier, which ensures correct data transmission. Field application shows that this method can realized high speed data transmissionwith high reliability and low error rate. In this way, much higher data rates can be realized in future deep drilling applications. Drill string acoustic telemetry is an effective transmission method to retrieve downhole data in drilling applications.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2016年第2期162-168,共7页
Journal of Southwest Petroleum University(Science & Technology Edition)
关键词
井下钻柱
自适应扩频通信
声波遥传
信道特性
传输速率
downhole drill string
adaptive spread-spectrum communication
acoustic telemetry
channel properties
datarates
