钻井液连续波传输相位偏移规律建模与分析  

Modeling and analysis of phase shift of continuous wave transmission in drilling fluids

作　　者：周博涛 苏义脑[1] 王家进 ZHOU Botao;SU Yinao;WANG Jiajin(Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China;CNPC Engineering Technology R&D Company Limited,Beijing 102200,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油集团工程技术研究院有限公司,北京102200

出　　处：《中国石油大学学报（自然科学版）》2024年第5期77-82,共6页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：中国石油集团关键核心项目(2020B-4021)。

摘　　要：钻井液连续波传输时因相位偏移导致的波形畸变是阻碍其现场应用的关键问题之一,探明相位偏移规律对于开发钻井液连续波信息传输技术具有重要意义。假设同一钻柱截面钻井液压力相等且钻井液流速存在径向分布,基于二维轴对称瞬态流动理论,采用小信号分析方法,建立钻井液连续波相移模型并给出适用条件,最后采用地面试验进行验证。利用该模型分析频率、传输距离、钻井液密度及黏度、钻柱内径对相位偏移量的影响。结果表明:相位偏移量随频率、钻井液密度及传输距离增加而增大且变化趋势近似呈线性,随钻柱内径的增加而逐渐减小;钻井液黏度对相位偏移量几乎无影响;钻井液信道可看作线性相位信道。The waveform distortion caused by phase shift during continuous wave transmission in drilling fluid is one of the key issues hindering the field application of the drilling fluid continuous wave data transmission technology.In this study,assuming that the pressure of drilling fluid on the same drill string cross-section is equal and the flow velocity has a radial distribution,a drilling fluid continuous wave phase shift model was proposed based on the two-dimensional axisymmetric transient flow theory and using the small signal analysis method.The model was verified with the results of ground experiments.The effects of frequency,transmission distance,drilling fluid density and viscosity,and drill string inner diameter on the phase shift were analyzed using the model.The results show that the phase shift increases approximately linearly with the increase of frequency,drilling fluid density and transmission distance,and it decreases gradually with the increase of drill string inner diameter.The viscosity of drilling fluid has almost no effect on the phase shift.The drilling fluid channel can be regarded as a linear phase channel.

关 键 词：相位偏移 钻井液连续波 钻井参数 信号参数 

分 类 号：TE21[石油与天然气工程—油气井工程]