多层管柱电磁探伤测井技术

在油水井生产过程中，由于周围环境的影响，使套管发生变形、损坏和腐蚀，直接影响油田的正常生产。加强套管损坏的检测诊断，对于查明套损原因，预防套损区域扩大，确定套管的维修作业方案，延长油水井的使用寿命等方面具有十分重要的意义。多层管柱电磁探伤测井技术利用电磁感应原理实现对井下多层管柱的腐蚀、变形、裂缝及壁厚进行检测。结合从俄罗斯引进的电磁探伤测井仪，介绍多层管柱电磁探伤测井的原理方法、仪器结构及特点，井用测井资料，展示在单套管和多层管内进行套管检查的应用效果。

The Multilayer Case-pipes Electromagnetic Defect Detecting Logging

In production process of the oil, gas or water well, the case-pipes have often been transfigured, damaged and corroded due to infection of the ambient conditions, thus, influencing the oilfield yields. It is quite necessary to find out the reasons of harming case-pipe, prevent the area of harmed case pipe from extending, confirm the project for maintaining the case-pipes and prolong the well's life time by improving the scathed case-pipes inspections. The multilayer case-pipes electromagnetic defect detection logging technique uses electromagnetic influence theory to detect the corrosion, transfiguration, fissure and thickness of the case-pipes in the well. In terms of the electromagnetic defect detection logging apparatus from Russia, this paper introduces the multilayer case-pipes electromagnetic defect detecting principle, apparatus structure and traits. Logging data from the single case-pipes or multilayer pipes logging revealed this technique's advantages.