过套管声波测井技术新进展

An Advancement in Through Casing Acoustic Logging Technology

针对过套管声波测井的普遍性难题,研发了双源反激的声波测井仪器及相应的数据处理技术。阐述了双源反激技术的工作原理,应用该技术于过套管声波测井,在地层胶结不好的条件下,可以有效压制套管井中产生的声波,提高数据采集中地层声波信号的信噪比。对该仪器采集的阵列声波数据作相应的处理,可以获得可靠的地层声波速度。这一技术的成功,使得过套管声波测井成为一门常规性的有效应用技术。

Through casing acoustic logging in poorly bonded boreholes is generally ineffective for measuring formation property.To overcome this difficulty,we have developed an acoustic tool using dual sources with opposite polarity and the processing technique for the data acquired by the tool.This paper elaborates the operation principle of the new technology and demonstrates its application to cased hole acoustic logging.By using the dual source design,the overwhelming casing waves from poorly bonded casing are largely suppressed and the formation acoustic waves are significantly enhanced in the data acquisition process.Subsequent processing of the data helps us reliably obtain acoustic velocity of the formation.The success of this technology makes cased hole acoustic logging an effective operation that can be routinely used to obtain reliable formation information through casing.