公开(公告)号：US20180209928A1

公开(公告)日：2018-07-26

申请号：US15927779

申请日：2018-03-21

申请人： PETROCHINA COMPANY LIMITED

发明人： Qiongwei LI ,  Bihai CHENG ,  Zewei TANG ,  Jianqiang XUE ,  Caili FU ,  Huili YANG ,  Zhiwu HE ,  Lihua YANG ,  Xinzhu ZHANG ,  Yulai SUN

IPC分类号： G01N27/20 ,  E21B47/00 ,  G01N27/04

CPC分类号： G01N27/205 ,  E21B17/1078 ,  E21B47/0006 ,  E21B47/0905 ,  G01N27/041

摘要： This disclosure provides a method and device for detecting the damage rate of an inner coating of a downhole oil casing. The method includes filling the oil casing with electrolyte, obtaining the well depth-detection current on a discharge electrode in a process of moving the discharge electrode from one end of the oil casing to the other end of the oil casing, and determining a well depth-damage rate state of the inner coating of the oil casing according to the well depth-detection current. This application can realize quantitative judgment for the damage rate of an inner coating of a downhole oil casing, resulting in rapid in detection speed, convenient and safe in operation, and low detection cost.