Effect Test on Compression Algorithms of Acoustic Logging Downhole Data
Wang Ruijia · Well Logging Technology · 2011
Due to limitations of cable bandwidth,when a large number of acoustic logging data are transported to the ground from the downhole for storage and process,well information is often lost,so,acoustic log data need to be compressed in real-time in the downhole by data compression technology.Introduced are lossless compression algorithms,such as,arithmetic coding,predictive coding,free lossless audio codec(FLAC) and APE,and lossy compression algorithm.The lossless compression algorithms are used to the downhole log data of MPAL expert mode,and the compression effect is investigated about the compression ratio and the distortion,the results from which show that FLAC algorithm and APE algorithm can obtain a better compression ratio,and the compression ratio of APE algorithm is about 50% and stability is better.When there's less demand on the small signal quality,lossy compression algorithms may be used.