偏移-消减法在钻井液压力波信号处理中的应用OA
Application of the Shift-Subtract Method in the Drilling Fluid Pressure Wave Signal Processing
为了应对随钻测井高速连续波传输系统在高码率(码率≥10 bit/s)条件下地面信号信噪比低、解码错误率高的技术难题,开展了钻井液压力波信号处理与解码方法研究.方法上,首先分析了井下复杂信道特性及传感器安装条件对压力波信号的畸变与干扰机理;其次针对强背景噪声与多径反射导致的信号混叠问题,提出了一种基于偏移-消减原理的级联去噪方法,通过动态估计噪声基底并逐周期消减干扰成分,实现了微弱压力波特征的有效增强;在此基础上,引入相干解码技术,利用本地载波与接收信号的相关性进行码元同步与相位判别,构建了一套集预处理、去噪、同步与解码于一体的高速连续波信号处理流程.仿真与现场试验结果表明,在信噪比低至-20 dB 的严苛环境下,该方法能够稳定提取压力波特征参数,波形畸变率降低至 5%以内;连续波信号的码元同步误差小于 0.1 个载波周期,解码误码率降至 10-5以下,实现了码元的无误恢复;系统有效传输速率稳定达到12～15 bit/s.结论认为,形成的信号处理框架显著增强了高速连续波在强干扰信道中的传输可靠性,有效提升了成像数据实时上传质量和钻井导向控制精度,为复杂地层智能随钻测量提供了关键技术支撑.
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.
梁耀;陈国兴;宋森;李安宗;陈文辉;郭怡潇;范晓文;刘洋
中国石油集团测井有限公司测井技术研究院,北京 102200||中国石油天然气集团有限公司测井重点实验室,陕西 西安 710077中国石油集团测井有限公司测井技术研究院,北京 102200||中国石油天然气集团有限公司测井重点实验室,陕西 西安 710077中国石油集团测井有限公司测井技术研究院,北京 102200||中国石油天然气集团有限公司测井重点实验室,陕西 西安 710077中国石油集团测井有限公司测井技术研究院,北京 102200||中国石油天然气集团有限公司测井重点实验室,陕西 西安 710077中国石油集团测井有限公司测井技术研究院,北京 102200||中国石油天然气集团有限公司测井重点实验室,陕西 西安 710077中国石油集团测井有限公司测井技术研究院,北京 102200||中国石油天然气集团有限公司测井重点实验室,陕西 西安 710077中国石油集团测井有限公司测井技术研究院,北京 102200||中国石油天然气集团有限公司测井重点实验室,陕西 西安 710077中国石油集团测井有限公司测井技术研究院,北京 102200||中国石油天然气集团有限公司测井重点实验室,陕西 西安 710077
天文与地球科学
随钻测井连续波高速数据传输偏移-消减滤波相干解码
logging while drillingcontinuous wavehigh data rateshift-subtractdenoisecoherent decoding
《测井技术》 2026 (2)
262-268,7
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)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)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)
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