井下油基泥浆电阻率和介电常数测量方法与测量探头设计  

Method and Sensor Design of Resistivity and Dielectric Constant Measurement for Oil-based Drilling Fluid in the Downhole Environment

作　　者：侯洪为[1] 于增辉[1] 刘耀伟[1] 廖胜军[1] 王芝江 王蕙 HOU Hongwei;YU Zenghui;LIU Yaowei;LIAO Shengjun;WANG Zhijiang;WANG Hui(China Oilfield Services Limited,Sanhe,Hebei 065201,China)

机构地区：[1]中海油田服务股份有限公司,河北三河065201

出　　处：《石油管材与仪器》2024年第2期23-25,30,共4页Petroleum Tubular Goods & Instruments

基　　金：中国海洋石油集团有限公司科技专项“测录试关键技术与装备”(编号:KJGG-2022-1401);中海油田服务股份有限公司科技项目“675型随钻测井技术与装备”(编号:YJB22YF003.05)。

摘　　要：随着油气勘探的发展,油基泥浆应用越来越广泛,适用于油基泥浆环境的电成像仪器也获得了大量应用。油基泥浆电阻率与介电常数对电成像仪器的测量影响很大,需要利用探头附近油基泥浆电阻率和介电常数数据对成像测量结果进行补偿。介绍了一种实时测量井下油基泥浆电阻率与介电常数的方法及其探头的设计,利用发射电极、接收电极及充满在环形间隙的油基泥浆形成同轴圆柱电容器,建立油基泥浆电阻率与电容器等效电阻的定量关系及油基泥浆介电常数与电容的定量关系,从而确定油基泥浆电阻率与介电常数。该技术为补偿油基泥浆对电成像测量数据的影响提供了理论依据和技术支持。Oil-based drilling liquid is applied to an increasingly wide extent in the oil drilling,and borehole electrical imaging tools suitable for oil-base drilling liquid are also widely applied.Resistivity and dielectric constant of the drilling liquid are key factors that affect the measuring of the borehole electrical imaging tools,so it is needed to compensate the measured imaging data.A method is introduced to measure resistivity and dielectric constant of the oil-based drilling liquid in the down-hole in real time,and the sensor is designed based on the method.A coaxial cylindrical capacitor consisting of an emission electrode,a receiving electrode and the oil-based drilling liquid in the annular between the two electrodes is developed,through which the quantitative relation between dielectric constant of the oil-based drilling liquid and capacitance of the capacitor,as well as that between resistivity of the oil-based drilling liquid and equivalent resistance of the capacitor is derived,so the resistivity and dielectric constant can be defined.This technology provides theoretical basis and technological support for compensating the influence of the oil-based drilling liquid on the measurement of the electrical imaging tools.

关 键 词：油基泥浆 电成像 同轴电容器 电阻率 介电常数 

分 类 号：P631.811[天文地球—地质矿产勘探]