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针对环形槽孔钻铤随钻感应测井仪结构特点,利用金属钻铤及开槽处地层电磁场边界条件首先给出了电磁场纵向分量Ez和Hz,然后由Ez和Hz导出了扇环区内外(径向)电磁场各分量的解析表示,还给出了无槽孔区段地层中电磁场计算公式,获得了环形槽孔式钻铤随钻感应测井仪场分布的全空间解,分析了环形槽孔式钻铤随钻感应测井系统的电磁场分布特点,给出了在钻铤非开孔区确定地层内电磁场系数的新方法(变系数法).为环形槽孔式钻铤随钻感应测井仪的场分布研究和仪器设计提供了重要的理论依据.
Aiming at the structural characteristics of the ring-shaped drill collar while drilling the induction tool, the longitudinal component Ez and Hz of the electromagnetic field are firstly obtained by using the boundary conditions of the metal collar and the slot electromagnetic field. Then, Radial) electromagnetic field. The formula of the electromagnetic field in the stratum without slot is also given. The full space solution of the annular slotted drill collar while drilling is obtained. The new method (variable coefficient method) for determining the electromagnetic field coefficient in strata in non-drilling area of drill collar is given. Well instrument field distribution and instrument design provides an important theoretical basis.