郝花丽

摘要：在多臂井径仪总体结构和布局设计的基础上，针对现有井径测量仪器采用拉杆电位器将位移量转化成电信号存在的不足，采用了差动变压器式（LVDT）位移传感器作为井径仪的探头，该传感器可以克服拉杆电位器存在的不足，改善探测性能。研究了基于差动变压器式位移传感的探头测量原理、硬件结构，确定了探头的材料选型及绕制方法。在上述工作的基础上，通过实验对传感器进行了标定及探测性能分析，给出了输出特性曲线，研究表明本文所研制的差动互感位移传感器可以完成井径测量。

关键词：多臂井径仪；差动变压器原理；探测性能

中图分类号：TP311 文献标识码：A 文章编号：1009-3044（2016）18-0211-03

Research on Multi arm Caliper Probe Based on Differential Transformer Principle

HAO Hua-li

（ Key Laboratory of Photoelectric Logging and Detecting of Oil and Gas， Ministry of Education ， Xian Shiyou University，Xi an 710065， China）

Abstract：In the based of multi arm caliper instrument overall structure and layout design， aiming at the existing well diameter measuring instrument using rod potentiometer will displacement is transformed into electrical signal in the presence of insufficient， the differential transformer （LVDT） displacement sensor as well diameter tester probe， the sensor can be to overcome the lack of rod potentiometer and improve detection performance. The measuring principle and hardware structure of the probe based on the differential transformer displacement sensor are studied. The material selection and the winding method of the probe are determined. On the basis of the work was given through the experiment on the sensor for the calibration and detection performance analysis of output characteristic curve. The results show that the development of differential transformer displacement sensor can be completed well diameter measurement.

Key words： multi arm caliper； principle of differential transformer； detection performance

井径仪是一种常用的套损检测技术，它最大的优势是测量精度高、测量结果直观，被广泛应用于油田当中。多臂井径仪以其测量臂多，测量精度高的优点成为井径仪的主要发展方向。多臂井径仪主要有电子线路和探头组成，其中探头探测性能的好坏直接影响井径检测性能的优劣，所以探头对井径仪的重要性可见一般[1]。目前使用的井径仪的探头使用的是拉杆电位器将位移量的大小转化为电信号，由于拉杆电位器的测量是一种有磨损的测量，易造成仪器机械摩擦，缩短探头的使用寿命[2]。差动变压器式位移传感器（Linear Variable Differential Transformer，简称LVDT ）基于电磁感应原理，可以将被测物体的位移变化转化成次级线圈感应电压的变化。LVDT具有结构简单、响应速度快、线性度好、分辨率高和使用寿命长等优点。……