随钻方位电阻率边界探测影响因素分析

Boundary Effects and Factor Analysis on Azimuthal Resistivity Tool Measurement While Drilling

提出采用随钻方位电磁波电阻率测井仪器进行边界探测方法及产生的边界效应,分别从测量仪器的源距、频率、天线安装角度等内部因素以及井眼倾斜角度、地层电阻率对比度等外部因素进行计算分析,总结边界响应规律,归纳了针对测量仪器本身的设计和调整以及针对可导致边界效应的测量环境的研究2种边界探测的研究方法,通过与Periscope仪器公布的数据相对比论证,确定影响因素计算分析准确性。研究成果对随钻地质导向边界测量、仪器设计参数选择及复杂储层地质构造实时解释具有指导意义。

This article briefly points out the boundary detection methods and response principle with LWD azimuthal resistivity tool.Summed up are boundary responses and effects from 5 aspects such as the resistivity tool antenna space,frequency,assemble tilted angle which is interior restriction factor and other exterior factors such as the borehole deviation angle and formation resistivity contrast; all these are used to analyze and calculate the factors when the MW resistivity tool passes across up or down the bed formation interface.Two researchable ways that one is about the tool design and adjustment,the other relates to survey environment are concluded for real detection and two examples are demonstrated to verify the calculation results compared with data from Schlumberger Company.