测井技术2026，Vol.50Issue(2)：262-268,7.DOI:10.16489/j.issn.1004-1338.2026.02.006
偏移-消减法在钻井液压力波信号处理中的应用
Application of the Shift-Subtract Method in the Drilling Fluid Pressure Wave Signal Processing
摘要
Abstract
To address the technical challenges of low signal-to-noise ratio and high decoding error rates in high-rate(rate≥10 bit/s)conditions for downhole continuous wave transmission systems,research is conducted on fluid pressure wave signal processing and decoding methods.Methodologically,the study first analyzed the distortion and interference mechanisms of pressure wave signals caused by complex downhole channel characteristics and sensor installation conditions.Second,to tackle signal aliasing issues arising from strong background noise and multipath reflections,a cascaded denoising method based on the shift-subtract principle is proposed.By dynamically estimating the noise baseline and progressively eliminating interference components,this approach effectively enhanced the characteristics of weak pressure waves.Building on this,coherent decoding technology is introduced,utilizing the correlation between the local carrier and received signals for symbol synchronization and phase discrimination.A comprehensive high-data-rate continuous wave signal processing workflow is thus established,integrating preprocessing,denoising,synchronization,and decoding.Simulation and field test results demonstrated that under harsh conditions with a signal-to-noise ratio as low as-20 dB,the method could stably extract pressure wave feature parameters,reducing waveform distortion rates to below 5%.Continuous wave signal symbol synchronization errors are less than 0.1 carrier cycles,and the decoding bit error rate is reduced to below 10-5,achieving error-free symbol recovery.The system's effective transmission rate consistently reached 12～15 bit/s.The study concluded that the developed signal processing framework significantly improved the transmission reliability of high-speed continuous waves in highly interfered channels,effectively enhanced the quality of real-time imaging data uploading and drilling guidance control precision,and provided critical technical support for intelligent downhole measurement in complex formations.关键词
随钻测井/连续波/高速数据传输/偏移-消减/滤波/相干解码Key words
logging while drilling/continuous wave/high data rate/shift-subtract/denoise/coherent decoding分类
天文与地球科学引用本文复制引用
梁耀,陈国兴,宋森,李安宗,陈文辉,郭怡潇,范晓文,刘洋..偏移-消减法在钻井液压力波信号处理中的应用[J].测井技术,2026,50(2):262-268,7.基金项目
中国石油天然气集团有限公司关键核心技术攻关项目"高速率深探测随钻测井技术与装备"(2026ZG022) （2026ZG022）
中国石油集团测井有限公司科研项目"模块化测导平台工程化应用"(CNLC2024-5D05) （CNLC2024-5D05）
中国石油集团测井有限公司科研项目"随钻智能测导系统标准研究与平台技术升级"(25ZYCJSG009-2501) （25ZYCJSG009-2501）
