TCFR型过套管电阻率测井仪研制

Development of TCFR Casedhole Resistivity Logging Tool

针对我国自主研制的TCFR型过套管电阻率测井仪,介绍了该仪器的测量方法及电极系探测特性、多DSP纳伏级微弱信号检测系统研制、套管自适应式硬质合金低电阻率包氟密封伸缩缸电极设计、DDS合成大功率发射电路开发等方面的情况。仪器测量动态范围1～100Ω.m,测量误差±7%,点测时间3min,电极收放总时间小于45s,液压电极推靠力大于150N,测前不洗井刮蜡。在长庆、吐哈、华北等油田完成了11口井的现场试验,仪器电阻率测井数值准确,性能稳定可靠。

The measurements and electrode investigation characteristics of China made casedhole resistivity logging tool TCFR are introduced. The tool has many features such as multi-I）SP weak signal detection system, electrode with self-adaptive low resistant fluoride seal cylinder detector, DDS high-power signal source, and etc. Its measurement range is 1 ～ 100 Ω· m with ± 7% errors. The point measurement time is 3 min and its electrode detector can be opened and closed in less than 45 s in total. Its hydraulic electrode has great pushing force （greater than 150 N）. No well-washing or wax-scraper job is needed before logging job. After 11 wells tests in Changqing, Tuha and Huabei oilfield, it can be concluded that the result of resistivity measurement is stable and reliable.