线圈系电磁波测井中支撑芯棒对响应场的影响

The Analytic Expressions of Mandrel Effect on the Response Field of Electromagnetic Logging Coils

本文分别求出了电磁波测井线圈系在无限均匀介质、含泥浆井眼中支撑芯棒对响应场影响的严格解析表达式和侧波响应表达式。数值计算结果表明:芯棒的性态并不影响电磁波测井中常用的相位差和幅度比的测量值。

An analytic expression and a lateral wave response analytic expression of mandrel effect on the response field of electromagnetic logging coils in uniform medium and in usual drilling mud borehole have been derived.The numerical results show that the material of mandrel has no influ- ence on measured values of the phase difference and the amplitude ratio in electromagnetic log- ging.