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本文利用矢量有限元法模拟了一种新型的随钻双感应测井仪器在三维非均匀地层中的响应,分析了井眼、泥浆、侵入带、围岩和仪器偏心对仪器信号的影响,并对仪器刻度时的最佳刻度环参数和刻度系数进行了研究。研究表明:这种新型的随钻双感应测井仪器探测深度优于现有随钻电磁波测井仪器,并具有一定的方位探测能力。深感应和中感应具有不同的最佳刻度环参数和刻度系数,通过刻度和标定响应信号均可达到与地层电导率一致的线性关系。由于探测深度和分辨率不同,深感应和中感应受井眼等地层模型参数和仪器偏心的影响程度不一样,校正系数也不相同。文中结果对随钻双感应测井仪器的研发和资料的应用具有参考意义。
In this paper, the vector finite element method is used to simulate the response of a new logging-while-drilling dual-induction logging instrument in three-dimensional inhomogeneous strata. The effects of borehole, mud, intrusion zone, surrounding rock and instrument eccentricity on instrument signal are analyzed. The best scale ring parameters and scale coefficients were studied when the instrument was calibrated. The research shows that this new type of logging-while-drilling dual-sensing logging instrument is superior to the existing logging-while-drilling electromagnetic logging tools and has certain azimuth detection capability. Deep sensing and middle sensing have different best scale ring parameters and scale coefficients, and linearity consistent with the conductivity of the formation can be achieved by calibrating and calibrating response signals. Due to the different depth and resolution of exploration, the depth and resolution of deep induction and middle induction are different from those of borehole model parameters and instrument eccentricity, and the correction coefficients are not the same. The results in this paper have reference significance for the research and development of dual induction logging while drilling and the application of data.