基于小波包最优处理算法的近钻头电阻率测量装置

Near-bit resistivity measurement device based on wavelet packet optimal algorithm

贾衡天 盛利民 窦修荣 邓乐 张磊

JIA Hengtian SHENG Limin DOU Xiurong DENG Le ZHANG Lei

中国石油钻井工程技术研究院，北京　100083 华北油田公司采油工艺研究院，河北任丘　 062552

CNPC Drilling Engineering and Technology Research Institute, Beijing 100083, China Production Technology Research Institute, Huabei Oil.eld Company, Renqiu 062552, China

电阻率随钻测量装置通常应用于实时对地层的评价，它采集到的反映电阻率信息的电信号含有大量的噪音成分，很难精确地反映出地层的电阻率信息。基于小波包最优处理算法的近钻头电阻率随钻测量装置，由于采用随钻的测量方式，能实时在第一时间测量到地层电阻率信息。通过小波包分解和信息熵最优小波树重构等算法，来对侧向电阻率、钻头电阻率以及方位电阻率测量的数据进行高精度降噪处理，提高了电阻率测量的准确性和可靠性。

The mission of resistivity measurement device while drilling is usually used to evaluat the real time stratum data. How-ever, the collected information that reflects the resistivity signal contains a lot of noise components, so it is difficult to accurately reflect the formation resistivity information. Based on the algorithm of wavelet packet, the device of near-bit resistivity measurement can mea-sure resistivity of stratum at first time because of the method of measurement while drilling. It can decrease noise when measuring the side resistivity, bit resistivity and azimuthal resistivity, by the algorithm of wavelet packet and the best wavelet tree of reconstruct signal based on information entropy, .which increase the accuracy and reliability of resistivity measurement.