The invention discloses a small caliber microspherically focused logging instrument, which comprises a casing, an electronic circuit board, microsphere plate and pusher plate, a five electrode plate on the microspheres from the inside to the outside are the main electrode A0, mud cake correction electrodes M0, A1 and M1 monitor electrode shielding electrode and M2 circuit board distributed potential power supply unit, signal measuring unit, microprocessor and supervision of electrode difference sampling circuit, the power supply unit comprises a sine wave generator, a frequency selective filter, adder, power amplifier and voltage controlled constant current source; the signal measuring unit comprises a measuring circuit potential difference between the main current measuring circuit and the measurement of M0 and M1. The circuit design is reasonable, the instrument of small diameter, light weight and convenient operation, good use effect, safe and reliable, can solve the existing microspherically focused logging instrument in electronic circuit is complex, low efficiency, poor use of logging instrument and for weight, diameter of coarse no method in drilling measurement etc..
【技术实现步骤摘要】
【技术保护点】
一种小口径微球形聚焦测井仪，包括圆柱杆状外壳、电子线路板、微球极板和驱动所述微球极板紧贴井壁的极板推靠器，所述电子线路板安装在圆柱杆状外壳内，所述微球极板安装在所述圆柱杆状外壳下部的极板推靠器托架上；所述微球极板由矩形橡胶板和镶嵌在所述矩形橡胶板上的五个电极（１）组成，五个电极（１）由内至外分别为主电极Ａ↓［０］、泥饼校正电极Ｍ↓［０］、屏蔽电极Ａ↓［１］、监督电极Ｍ↓［１］和监督电极Ｍ↓［２］，主电极Ａ↓［０］为矩形电极且泥饼校正电极Ｍ↓［０］、屏蔽电极Ａ↓［１］、监督电极Ｍ↓［１］和监督电极Ｍ↓［２］均为环状电极，所述主电极Ａ↓［０］与测井仪的接地电极Ｂ相接，其特征在于：所述电子线路板上布设有供电单元、信号测量单元和微处理器以及对监督电极Ｍ↓［１］和监督电极Ｍ↓［２］之间的电位差Ｖ↓［Ｉ０］进行实时采集的监督电极间电位差采样电路，所述微处理器通过数据传输端口（２）与布设在地面上的测井数据采集系统相接； 所述供电单元包括正弦波发生器（３－１）、与正弦波发生器（３－１）相接且输出基准电压信号Ｖ↓［ｆ］的选频滤波器一（３－２）、对基准电压信号Ｖ↓［ｆ］和电位差Ｖ↓［Ｉ０］进行叠加的加法...
【技术特征摘要】
【专利技术属性】
技术研发人员：王佟，刘付光，左明星，刘承民，平云轩，
申请(专利权)人：中国煤炭地质总局一二九勘探队，
类型：发明
国别省市：13
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