摘要
随钻声波测井仪能够伴随钻井作业,在泥浆侵入地层之前或侵入很浅时采集声波测井数据。然而目前在用的泥浆脉冲传输方式传输速率极低,井下仪器和地面系统之间只能进行简单的通信交互,大量声波测井数据无法实时上传到地面系统,从而导致地面人员不能实时监测地质状况。针对这一问题,该文将时差提取算法集成到井下电路系统中,在井下实现从声波测井数据中实时提取反映地层状况的时差信息,并将此时差处理结果实时上传到地面系统,地面作业人员则能够通过时差信息来实时了解地层状况,从而指导钻井作业。实验结果表明,该算法能够在井下电路中高效运行,且计算速度快、实时处理性能优异、时差提取精度高,完全满足随钻声波测井仪实际工作的需求。
Acoustic logging-while-drilling tool is capable of collecting of acoustic logging data while drilling work processes at the same time. Moreover, the logging data were acquired when the formation was not contaminated by mud. However, mud pulse transmission has an extremely low transmission rate and only simple interactive communications can be realized between surface and down-hole tool, a large amount of logging data cannot be uploaded to the surface, so that logging personnel is not able to monitor geological condition in real time. To solve this problem, this paper embeds a time-difference extraction algorithm into the down-hole circuit system, the time-difference data which reflects formation information can be extracted from acoustic logging data in the down-hole tool. So that the processing result can be real-time uploaded to the surface, thus logging personnel can analyze the formation condition through time-difference data and consequently guide the drilling work. It is shown by experiment that the algorithm can run efficiently in the down-hole circuit and demonstrate the excellent performance of high accuracy, which meets the practical working requirements of acoustic logging-while-drilling tool.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2015年第4期550-556,共7页
Journal of University of Electronic Science and Technology of China
基金
国家自然科学基金(61201131)
国家863项目重大专项(2011AA090101)
"十二五"国家科技重大专项(2011ZX05020-005)
中央高校基本科研业务费专项资金(ZYGX2012J092)
关键词
随钻声波测井仪
井下电路系统
泥浆脉冲传输
实时处理
时差提取算法
acoustic logging-while-drilling tool
downhole circuit system
mud pulse transmission
real-time processing
time-difference extraction algorithm
