Research on lossless compression coding of ultrasonic log data

Large amounts of data are transported to the ground in the process of logging and limitations of cable bandwidth, so ultrasonic log data need to be compressed in the downhole when logging. In this case, this paper put forward a new lossless coding structure UWLC to compress the ultrasonic logging data. This structure of UWLC is designed to encode the data to close achieve the effect of envelope detection. The UWLC has a strong ability to track data amplitude. In ultrasonic log data compression case, comparing to traditional Golomb-rice, adaptive Golomb-rice and LZW compression algorithms, UWLC has higher compression ratio.